CN118945015A - Method for indicating reference signal port and communication device - Google Patents
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Abstract
The application provides a method and a communication device for indicating a reference signal port, which can be applied to wireless communication, for example: 5G or NR system. The method comprises the following steps: the method comprises the steps that a sending end device sends first indication information to a receiving end device, wherein the first indication information indicates a first index, and the first index corresponds to a plurality of reference signal port indexes. Meanwhile, a plurality of reference signal port indexes are associated with a plurality of codewords, and the plurality of reference signal port indexes associated with one codeword of the plurality of codewords correspond to the same code division multiplexing CDM group or correspond to the same time domain orthogonal mask TD-OCC. And then, the transmitting end equipment transmits the reference signals with the receiving end equipment based on a plurality of ports corresponding to the plurality of reference signal port indexes. The method for indicating the reference signal port can reduce the decoding complexity of the receiving end equipment, improve the channel estimation performance, improve the MU-MIMO multiplexing capability and improve the frequency spectrum efficiency.
Description
Technical Field
Embodiments of the present application relate to the field of communications, and more particularly, to a method of indicating a reference signal port and a communication apparatus.
Background
The demodulation reference signal (demodulation REFERENCE SIGNAL, DMRS) is mainly used for radio channel estimation, and is transmitted with a corresponding channel within a predetermined resource range and used for decoding of the relevant channel. In the R15 version of the third generation partnership project (3rd generation partnership project,3GPP), two DMRS resource mapping types are defined, type1 (type 1) and type2 (type 2), respectively. The DMRS port number upper limit corresponding to type1 is 8, and the DMRS port number upper limit corresponding to type2 is 12.
Generally, one DMRS port corresponds to one transport stream (also referred to as a transport layer number, a spatial layer number, or a rank). For example, for a multiple-input multiple-output (multiple input multiple output, MIMO) transmission with a number of transport streams R, the number of DMRS ports required is R. However, as future wireless communication device deployments become denser, the number of terminal devices increases further, placing higher demands on MIMO transport streams. In order to support higher transmission stream numbers to improve the spectrum efficiency of the MIMO system, in the R18 version of 3GPP, more DMRS ports are extended, where the upper limit of the number of DMRS ports corresponding to type 1 may be 16. the DMRS port number upper limit corresponding to type 2 may be 24. Therefore, for the expanded R18 version port, how to effectively allocate a corresponding DMRS port to the terminal device by the network device becomes a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a method and a communication device for indicating a reference signal port, which can reduce decoding complexity of receiving end equipment, improve channel estimation performance, improve MU-MIMO multiplexing capability and improve spectrum efficiency.
In a first aspect, embodiments of the present application provide a method for indicating a reference signal port, where the method may be performed by a transmitting device, for example, a network device, or may also be performed by a chip or a circuit configured in the transmitting device, which is not limited by the present application. The method comprises the following steps: the transmitting end device transmits first indication information to the receiving end device. The first indication information indicates a first index, and the first index corresponds to a plurality of reference signal port indexes. The plurality of reference signal port indexes are associated with a plurality of code words, the plurality of reference signal port indexes associated with a first code word in the plurality of code words correspond to the same code division multiplexing CDM group, or the plurality of reference signal port indexes associated with the first code word correspond to the same time domain orthogonal mask TD-OCC, and the first code word is one of the plurality of code words; the transmitting end device transmits reference signals with the receiving end device based on a plurality of ports corresponding to the plurality of reference signal port indexes.
It can be appreciated that, for the physical downlink shared channel PDSCH, the transmitting end device transmits reference signals based on the reference signal port, while the receiving end device receives reference signals according to the reference signal port. For the physical uplink shared channel PUSCH, the receiving end device sends a reference signal based on the reference signal port, and the transmitting end device receives the reference signal according to the reference signal port.
By configuring the plurality of reference signal port indexes associated with each codeword to belong to the same CDM group or TD-OCC, the complexity of determining time-frequency resources when receiving the reference signal by receiving terminal equipment can be reduced, the complexity of decoding is further reduced, and the purpose of improving the channel estimation performance is achieved.
With reference to the first aspect, in certain implementations of the first aspect, the ports corresponding to the plurality of reference signal port indexes associated with the first codeword belong to a subset of a second port set and a first port set, or the ports corresponding to the plurality of reference signal port indexes associated with the first codeword belong to a subset of the second port set, two long-range frequency domain mask sequences corresponding to any two ports in the first port set are mutually orthogonal, four long-range frequency domain mask sequences corresponding to any two ports in the second port set are mutually orthogonal, the two long-range frequency domain mask sequences include frequency domain mask sequences corresponding to 2 consecutive subcarriers in one CDM group, the four long-range frequency domain mask sequences include frequency domain mask sequences corresponding to 4 consecutive subcarriers in one CDM group, and the frequency domain mask sequence corresponding to any one port in the subset of the second port set is different from the frequency domain mask sequence corresponding to any one port in the first port set.
With reference to the first aspect, in certain implementations of the first aspect, a number of ports belonging to a subset of the second port set among ports corresponding to the plurality of reference signal port indexes associated with the first codeword is a first value, a number of ports corresponding to the plurality of reference signal port indexes corresponding to a first CDM group or a first TD-OCC in the subset of the second port set is the first value, the first CDM group is one of a plurality of CDM groups corresponding to a plurality of ports in the subset of the second port set, or the first TD-OCC is one of a plurality of TD-OCCs corresponding to a plurality of ports in the subset of the second port set.
With reference to the first aspect, in certain implementations of the first aspect, ports corresponding to the plurality of reference signal port indexes associated with the first codeword are the same as ports corresponding to the first CDM group or the first TD-OCC in the subset of the second port set.
With reference to the first aspect, in certain implementations of the first aspect, a plurality of reference signal port indexes corresponding to the first codeword includes ports in N second port sets, where the N ports correspond to the first CDM group.
With reference to the first aspect, in certain implementations of the first aspect, the ports corresponding to the first CDM group or the first TD-OCC in the subset of the second port set are the N ports.
Based on the scheme, the receiving end equipment can be configured to preferentially use the corresponding ports in the subset of the second port set when receiving the reference signal, so that the compatibility of the system to the receiving equipment using the old ports is ensured, the MU-MIMO multiplexing capacity is improved, and the aim of improving the spectrum efficiency is fulfilled.
With reference to the first aspect, in certain implementation manners of the first aspect, ports corresponding to a plurality of reference signal port indexes in the second port set satisfy the following time-frequency resource and sequence mapping relationship:
k′＝0,1
n＝0,1,...
l′＝0,1
Where p is the reference signal port index, μ is the subcarrier spacing parameter, For mapping to the reference signal symbol corresponding to the reference signal port p on the resource element RE with index (k, l),As a power factor, w t (l ') is a time domain mask corresponding to a time domain symbol with an index of l ', w f (f) is a frequency domain mask corresponding to a subcarrier with an index of k ', f=2· (n mod 2) +k ', m=2n+k ', m is an m-th element in the reference signal sequence, l represents an orthogonal frequency division multiplexing OFDM symbol index contained in one slot,And delta is a subcarrier offset factor for the symbol index of the initial time domain symbol occupied by the reference signal symbol or the symbol index of the reference time domain symbol.
With reference to the first aspect, in certain implementation manners of the first aspect, ports corresponding to a plurality of reference signal port indexes in the second port set satisfy the following time-frequency resource and sequence mapping relationship:
k′＝0,1,2,3
n＝0,1,...
l′＝0,1
Where p is the reference signal port index, μ is the subcarrier spacing parameter, For mapping to the reference signal symbol corresponding to the reference signal port p on the resource element RE with index (k, l),W t (l ') is a time domain mask corresponding to a time domain symbol with index of l', w f (k ') is a frequency domain mask corresponding to a subcarrier with index of k', l represents an orthogonal frequency division multiplexing OFDM symbol index contained in one slot,And delta is a subcarrier offset factor for the symbol index of the initial time domain symbol occupied by the reference signal symbol or the symbol index of the reference time domain symbol.
With reference to the first aspect, in certain implementation manners of the first aspect, ports corresponding to a plurality of reference signal port indexes in the second port set satisfy the following time-frequency resource and sequence mapping relationship:
k′＝0,1
n＝0,1,...
l′＝0,1
where p is the index of the reference signal port, μ is the subcarrier spacing parameter, For mapping to the reference signal symbol corresponding to the reference signal port p on the resource element RE with index (k, l),For the power factor, w t (l ') is the time domain mask sequence element corresponding to the time domain symbol with index l', w f (k ') is the frequency domain mask element corresponding to the subcarrier with index k', delta is the subcarrier offset factor,B (nmod) is an outer mask sequence for the symbol index of the start time domain symbol or the symbol index of the reference time domain symbol occupied by the reference signal symbol, where b (0) =1, b (1) =1 for the existing DMRS port of R15; for the newly added DMRS port of R18, b (0) =1, b (1) = -1, or b (0) = -1, b (1) =1.
With reference to the first aspect, in certain implementations of the first aspect, the plurality of codewords further includes a second codeword, and ports corresponding to a plurality of reference signal port indexes associated with the second codeword belong to a subset of the first port set and the second port set or to a subset of the second port set.
With reference to the first aspect, in certain implementations of the first aspect, a number of ports belonging to a subset of the second port set among ports corresponding to the plurality of reference signal port indexes associated with the second codeword is a second value, a number of ports corresponding to the plurality of reference signal port indexes corresponding to a second CDM group or a second TD-OCC in the subset of the second port set is the second value, the second CDM group is one of a plurality of CDM groups corresponding to a plurality of ports in the subset of the second port set, or the second TD-OCC is one of a plurality of TD-OCCs corresponding to a plurality of ports in the subset of the second port set.
With reference to the first aspect, in certain implementations of the first aspect, ports corresponding to the plurality of reference signal port indexes associated with the second codeword are the same as ports corresponding to the second CDM group or the second TD-OCC in the subset of the second port set.
Based on the scheme, the same configuration is carried out on a plurality of code words, so that the system performance can be further enhanced, and the reliability of the system is ensured.
With reference to the first aspect, in some implementations of the first aspect, the type of the reference signal is a first type, and when a maximum length of the reference signal is 1, a plurality of reference signal port indexes corresponding to the first index are {8,9,3,10,11}; the plurality of reference signal port indexes associated with the first codeword are {8,9}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {8,9}, and the reference signal port indexes {8,9} correspond to the first CDM group; the plurality of reference signal port indices associated with the second codeword is {3,10,11}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {10,11}, and the reference signal port index {3,10,11} corresponds to the second CDM group.
With reference to the first aspect, in some implementations of the first aspect, the type of the reference signal is a first type, and when a maximum length of the reference signal is 1, a plurality of reference signal port indexes corresponding to the first index are {1,8,9,3,10,11}; a plurality of reference signal port indices {1,8,9} associated with the first codeword, the first value being 2, the reference signal port indices {8,9} corresponding to a first CDM group; the plurality of reference signal port indices associated with the second codeword is {3,10,11}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {10,11}, and the reference signal port index {3,10,11} corresponds to the second CDM group.
With reference to the first aspect, in some implementations of the first aspect, the type of the reference signal is a first type, and when a maximum length of the reference signal is 2, a plurality of reference signal port indexes corresponding to the first index are {8,9,5,12,13}; a plurality of reference signal port indexes {8,9} associated with the first codeword, the first value being 2, ports included in a subset of the second port set having port indexes {8,9}, the reference signal port indexes {8,9} corresponding to a first TD-OCC; the plurality of reference signal port indexes associated with the second codeword are {5,12,13}, the second value is 2, the ports included in the subset of the second port set are {12,13}, the reference signal port indexes {5,12,13} are corresponding to the second TD-OCC.
With reference to the first aspect, in some implementations of the first aspect, the type of the reference signal is a first type, and when a maximum length of the reference signal is 2, a plurality of reference signal port indexes corresponding to the first index are {1,8,9,5,12,13}; a plurality of reference signal port indexes {1,8,9} associated with the first codeword, the first value being 2, ports included in the subset of the second port set corresponding to port indexes {8,9}, the reference signal port indexes {8,9} corresponding to a first TD-OCC; the plurality of reference signal port indexes associated with the second codeword are {5,12,13}, the second value is 2, the ports included in the subset of the second port set are {12,13}, the reference signal port indexes {5,12,13} are corresponding to the second TD-OCC.
With reference to the first aspect, in certain implementation manners of the first aspect, the type of the reference signal is a second type, and when a maximum length of the reference signal is 1, a plurality of reference signal port indexes corresponding to the first index are {12,13,3,14,15}; the plurality of reference signal port indexes associated with the first codeword are {12,13}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to the first CDM group; the plurality of reference signal port indices associated with the second codeword is {3,14,15}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {14,15}, and the reference signal port index {3,14,15} corresponds to the second CDM group.
With reference to the first aspect, in certain implementation manners of the first aspect, the type of the reference signal is a second type, and when a maximum length of the reference signal is 1, a plurality of reference signal port indexes corresponding to the first index are {1,12,13,3,14,15}; the plurality of reference signal port indexes associated with the first codeword are {1,12,13}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to the first CDM group; the plurality of reference signal port indices associated with the second codeword is {3,14,15}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {14,15}, and the reference signal port index {3,14,15} corresponds to the second CDM group.
With reference to the first aspect, in some implementations of the first aspect, the type of the reference signal is a second type, and when a maximum length of the reference signal is 2, a plurality of reference signal port indexes corresponding to the first index are {12,13,7,18,19}; a plurality of reference signal port indexes {12,13} associated with the first codeword, the first value being 2, ports included in a subset of the second port set having port indexes {12,13}, the reference signal port indexes {12,13} corresponding to a first TD-OCC; the plurality of reference signal port indexes associated with the second codeword are {7,18,19}, the second value is 2, the ports included in the subset of the second port set are {18,19}, the reference signal port indexes {7,18,19} are corresponding to the second TD-OCC.
With reference to the first aspect, in some implementations of the first aspect, the type of the reference signal is a second type, and when a maximum length of the reference signal is 2, a plurality of reference signal port indexes corresponding to the first index are {1,12,13,7,18,19}; a plurality of reference signal port indexes {1,12,13} associated with the first codeword, wherein the first value is 2, port indexes corresponding to ports included in a subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to a first TD-OCC; the plurality of reference signal port indexes associated with the second codeword are {7,18,19}, the second value is 2, the ports included in the subset of the second port set are {18,19}, the reference signal port indexes {7,18,19} are corresponding to the second TD-OCC.
With reference to the first aspect, in certain implementations of the first aspect, when a number of the plurality of reference signal port indexes associated with the first codeword is less than 4, the plurality of reference signal port indexes associated with the first codeword does not include 0.
With reference to the first aspect, in certain implementation manners of the first aspect, the method further includes: the transmitting terminal equipment transmits second indication information to the receiving terminal equipment, wherein the second indication information indicates reference signal configuration information corresponding to a reference signal, and the reference signal configuration information comprises a reference signal type and a maximum length.
In a second aspect, embodiments of the present application provide a method for indicating a reference signal port, where the method may be performed by a receiving end device, for example, a terminal device, or may also be performed by a chip or a circuit configured in the receiving end device, which is not limited in this aspect of the present application. The method comprises the following steps: the method comprises the steps that a receiving end device receives first indication information from a transmitting end device, wherein the first indication information indicates a first index, the first index corresponds to a plurality of reference signal port indexes, the plurality of reference signal port indexes are associated with a plurality of code words, the plurality of reference signal port indexes associated with a first code word in the plurality of code words correspond to the same Code Division Multiplexing (CDM) group, or the plurality of reference signal port indexes associated with the first code word correspond to the same time domain orthogonal mask (TD-OCC), and the first code word is one of the plurality of code words; the receiving end device transmits reference signals with the transmitting end device based on the plurality of reference signal ports.
It may be appreciated that, in the second aspect, the implementation manner in the foregoing first aspect may be referred to for the definition of the ports corresponding to the multiple reference signal port indexes associated with the first codeword, the multiple reference signal port indexes when the reference signal type and the maximum length are different, the port indexes corresponding to the corresponding first port set, the port indexes corresponding to the subset of the second set, and so on, and will not be described herein again.
In a third aspect, an embodiment of the present application provides a communication system. The system comprises a sending device and a receiving device. Wherein the transmitting device is configured to perform the method as in the first aspect or any one of the possible implementations described above. The receiving device is adapted to perform the method as in the second aspect or any one of the possible implementations described above.
In a fourth aspect, an embodiment of the present application provides a communication apparatus. The apparatus is for performing the method provided in any one of the first or second aspects above. In particular, the communication device may comprise means and/or modules, such as a processing module and a transceiver module, for performing the method of the first aspect or any of the above-mentioned implementations of the first aspect.
In an implementation manner, the communication apparatus may include a unit and/or a module configured to perform the method provided in the first aspect or any one of the implementation manners of the first aspect, which is a transmitting end device. The transceiver module may be a transceiver, or an input/output interface. The processing module may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.
Or the communication means is a chip, a system-on-chip or a circuit in the transmitting end device. The transceiver module may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, system on a chip or circuit, etc. The processing module may be at least one processor, processing circuit or logic circuit, etc.
In another implementation manner, the communication apparatus may include a unit and/or a module configured to perform the method provided in the second aspect or any one of the foregoing implementation manners of the second aspect, which is a transmitting end device. The transceiver module may be a transceiver, or an input/output interface. The processing module may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.
Or the communication means is a chip, a system-on-chip or a circuit in the transmitting end device. The transceiver module may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, system on a chip or circuit, etc. The processing module may be at least one processor, processing circuit or logic circuit, etc.
In a fifth aspect, embodiments of the present application provide a processor configured to perform the method provided in the above aspects. The operations such as transmitting and acquiring/receiving, etc. related to the processor may be understood as operations such as outputting and receiving, inputting, etc. by the processor, and may be understood as operations such as transmitting and receiving by the radio frequency circuit and the antenna, if not specifically stated, or if not contradicted by actual function or inherent logic in the related description, which is not limited by the present application.
In a sixth aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions) which, when executed, causes a computer to perform the method of any one of the possible implementations of the first or second aspects described above.
In a seventh aspect, a computer readable storage medium is provided, storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the method of any one of the possible implementations of the first or second aspects described above to be performed.
In an eighth aspect, a communication system is provided, comprising at least one terminal device and at least one network device, for performing the method in any one of the possible implementations of the first or second aspect.
The advantages of the second to eighth aspects may be specifically referred to the description of the advantages of the first aspect, and are not repeated here.
Drawings
Fig. 1 illustrates an exemplary architecture diagram of a communication system 100 to which embodiments of the present application are applicable.
Fig. 2 is a reference signal pattern of two configuration types in the current standard.
Fig. 3 shows a schematic flow chart of a method 300 for indicating a reference signal port according to an embodiment of the present application.
Fig. 4 shows CDM and TD-OCC group schematics corresponding to R18 DMRS ports.
Fig. 5 is a schematic diagram of a communication device according to an embodiment of the present application.
Fig. 6 is a schematic diagram of another communication device according to an embodiment of the present application.
Fig. 7 is a schematic block diagram of a network device of an embodiment of the present application.
Fig. 8 is a schematic block diagram of a terminal device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
The following description is made in order to facilitate understanding of embodiments of the present application.
The words "first", "second", etc. and various numerical numbers in the first, the text description of the embodiments of the application shown below or in the drawings are merely for descriptive convenience and are not necessarily for describing particular sequences or successes and are not intended to limit the scope of the embodiments of the application. For example, different indication information is distinguished, etc.
The terms "comprises," "comprising," and "having," in the context of the second, following illustrated embodiment of the present application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
Third, in embodiments of the application, the words "exemplary" or "such as" are used to mean examples, illustrations, or descriptions, and embodiments or designs described as "exemplary" or "such as" should not be construed as being preferred or advantageous over other embodiments or designs. The use of the word "exemplary" or "such as" is intended to present the relevant concepts in a concrete fashion to facilitate understanding.
Fourth, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fifth, the technical solution of the present application may be applied to DMRS, and it is understood that with development of communication technology, new signals having the same functions as the DMRS may be defined in future communication systems, and the present application is also applicable to the present application. That is, the embodiment of the present application uses the reference signal as the DMRS as an example to describe the technical solution, which should not limit the present application in any way.
The technical scheme of the embodiment of the application can be applied to various communication systems, such as: fifth generation (5 th generation, 5G) systems or New Radio (NR), evolved packet core (evolved packet core, EPC), evolved packet system (PACKET SYSTEM, EPS), evolved universal mobile telecommunications system (univeRMal mobile telecommunication system, UMTS) terrestrial radio access network (evolved UMTS terrestrial radio access network, E-UTRAN), long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD), and the like. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system.
The technical solution of the embodiment of the present application may also be applied to a device-to-device (D2D) communication, a vehicle-to-everything (V2X) communication, a machine-to-machine (machine to machine, M2M) communication, a machine type communication (MACHINE TYPE communication, MTC), an internet of things (internet of things, ioT) communication system, or other communication systems.
To facilitate understanding, some technical matters related to the present application will be explained first.
(1) Receiving end device
In the scheme of the application, the receiving end equipment can be terminal equipment, wherein the terminal equipment can be various equipment for providing voice and/or data connectivity for a user, and can also be called as a terminal, user Equipment (UE), a mobile station, a mobile terminal and the like. The terminal may be widely applied to various scenes, for example, device-to-device (D2D), vehicle-to-device (vehicle to everything, V2X) communication, machine-type communication (MTC), internet of things (internet of things, IOT), virtual reality, augmented reality, industrial control, autopilot, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, and the like. The terminal can be a mobile phone, a tablet computer, a computer with a wireless receiving and transmitting function, a wearable device, an aerospace device and the like. In the embodiment of the application, the chip applied to the device can also be called a terminal.
(2) Transmitting terminal equipment
The receiving end device in the scheme of the application can be network devices, wherein the network devices can be access network devices such as base stations, and the base stations can be base stations (base transceiver station, BTS) in a global system for mobile communications (global system of mobile communication, GSM) or code division multiple access (code division multiple access, CDMA), can also be base stations in a wideband code division multiple access (wideband code division multiple access, WCDMA) system, can also be evolution base stations (evolutional nodeB, eNB or eNodeB) in a long term evolution (long term evolution, LTE) system, next generation base stations (next generation NodeB, gNB) in a fifth generation (5th generation,5G) mobile communication system, next generation base stations in a sixth generation (6th generation,6G) mobile communication system, base stations in a future mobile communication system and the like. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the network equipment. For example, the network device may be a module or unit that performs a function of the base station part, for example, may be a Central Unit (CU), or may be a Distributed Unit (DU). Wherein, CU and DU respectively complete a part of protocol stack functions of the base station. Furthermore, the functionality of a CU may be implemented by a plurality of entities, e.g. separating the functionality of the Control Plane (CP) and the User Plane (UP) of the CU, forming a CU control plane (CU-CP) and a CU user plane (CU-UP). For example, CU-CP and CU-UP may be implemented by different functional entities and connected through an E1 interface, and CU-CP and CU-UP may be coupled to DUs.
(3)DMRS
The method is mainly used for wireless channel estimation, and is transmitted along with corresponding channels in a preset resource range and used for decoding related channels. If the DMRS quality is poor, the corresponding channel cannot be decoded. The fifth generation (the 5th Generation,5G) communication channels such as physical downlink control channel (physical downlink control channel, PDCCH), physical downlink shared channel (physical downlink SHARE CHANNEL, PDSCH), physical uplink control channel (physical uplink control channel, PUCCH), physical uplink shared channel (PUSCH SHARE CHANNEL, PUSCH) or physical broadcast channel (physical broadcast channel, PBCH) are all designed to use corresponding DMRS.
Taking the data channel PDSCH as an example, the DMRS is usually precoded identically to the transmitted data signal, so as to ensure that the DMRS and the data signal experience the same equivalent channel. Assuming that the DMRS vector transmitted by the transmitting end is s, the transmitted data signal vector is x, and the DMRS and the data signal perform the same precoding (multiply by the same precoding matrix). The data signal vector y and the DMRS vector r received by the receiving end can be represented by formula (1) and formula (2), respectively:
Wherein, Representing the equivalent channel experienced by the data signal and DMRS, n represents additive noise. The receiving end can obtain an equivalent channel based on the known DMRS vector s by using a channel estimation algorithm, such as Least Square (LS) channel estimation, minimum mean square error (minimum mean square error, MMSE) channel estimation, etcIs a function of the estimate of (2). Demodulation of the data signal may be accomplished based on the equivalent channel.
With the introduction of the MIMO technology into a wireless communication system, a transmitting end may transmit multi-stream data on the same time-frequency resource, and a receiving end may recover all the data. At this time, the DMRS is used to estimate an equivalent channel matrix, and its dimension may be N R ×r, where N R represents the number of receiving antennas, and R represents the number of transmission streams (also referred to as the number of transmission layers, the number of spatial layers). Typically, one DMRS port (port) corresponds to one transport stream, i.e., for MIMO transmission with a transport stream number R, the number of DMRS ports required is R. In order to ensure the quality of channel estimation, DMRS ports corresponding to multiple transmission streams are orthogonal ports.
For one DMRS port, in order to perform channel estimation for different time-frequency resources, multiple DMRS needs to be transmitted on multiple time-frequency resources. One DMRS sequence corresponds to a plurality of DMRS corresponding to one port. One DMRS sequence includes a plurality of DMRS sequence elements.
Taking DMRS sequence generation from gold sequences as an example, the nth DMRS sequence element in DMRS sequence r l (n) can be generated by:
wherein c (n) is a pseudo-random sequence, and c (n) can be a gold sequence with a sequence length of 31; for a sequence c (n) of output length M PN, n=0, 1,..m PN -1, can be determined by equation (4):
Where N C = 1600, the first m-sequence x 1 (N) may be initialized to x 1(0)＝1,x1 (N) =0, N = 1,2,..30, the second m-sequence x 2 (N) may be initialized by the parameter c init, c init may be determined by formula (5):
Wherein, l represents an index value of an OFDM symbol on one slot; The number of symbols contained in one slot; Indexing time slots in a system frame; for initializing parameters, the value can be 0 or 1; May be configured by higher layer signaling, which is cell-related (ID), which may typically be equal to the cell ID; lambda denotes a code division multiplexing (code division multiplexing, CDM) group (group) index corresponding to the DMRS port.
The DMRS sequence corresponding to one DMRS port can be mapped to the corresponding time-frequency resource through a preset time-frequency resource mapping rule. For the antenna port p (corresponding to the DMRS port p), the mth sequence element r (m) in the corresponding DMRS sequence may be mapped to the RE with index (k, l) p,μ according to the mapping rule shown in the formula (6):
The RE with index (k, l) p,μ corresponds to the OFDM symbol with index l in one slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain. For the DMRS modulation symbol corresponding to DMRS port p mapped to RE with index (k, l) p,μ,k′＝0,1；N=0, 1,; l' =0, 1; delta is a subcarrier offset factor; type1 and type2 respectively represent 2 DMRS configuration types (DMRS configuration type) defined in the current NR protocol; μ is the subcarrier spacing; An index of a starting OFDM symbol or an index of a reference OFDM symbol occupied by the DMRS modulation symbol; Is a power scaling factor; w f (k ') is a frequency domain mask element corresponding to a subcarrier with index k', and w t (l ') is a time domain mask element corresponding to an OFDM symbol with index l'; m=2n+k'.
In the configuration type 1 mapping rule, w f(k′)、wt (l') corresponding to DMRS port p, and the value of Δ can be referred to in table 1 or TS 38.211 section 6.4.1.1.3.
TABLE 1
In the configuration type 2 mapping rule, w f(k′)、wt (l') corresponding to the DMRS port p and the value of Δ may be determined according to table 2.
TABLE 2
In tables 1 and 2, λ represents the index of CDM group, and the DMRS ports in the same CDM group occupy the same time-frequency resources.
(4) Code division multiplexing (code division multiplexing, CDM) group
The network device may divide the DMRS ports into a plurality of CDM groups. The DMRS ports within the same CDM group occupy the same time-frequency resources. In the R15 version of 3GPP, two DMRS resource mapping types, type1 (type 1) and type2 (type 2), are defined.
Take type 1DMRS as an example: for single symbol DMRS, a maximum of 4 DMRS ports are supported in R15, with DMRS resources occupying one OFDM symbol. The 4 DMRS ports are divided into 2 code division multiplexing groups (CDM groups), where CDM group 0 includes port 0 and port 1; CDM group 1 contains port 2 and port 3.CDM group 0 and CDM group 1 are frequency division multiplexed. DMRS ports contained within CDM group are mapped on the same time-frequency resource. DMRS corresponding to DMRS ports included in CDM groups are distinguished by an orthogonal cover code (orthogonal cover code, OCC), so that orthogonality of the DMRS ports in CDM groups is ensured. Specifically, port 0 and port 1 are located in the same Resource Element (RE), and resource mapping is performed in a comb-tooth manner in the frequency domain, that is, a subcarrier is spaced between adjacent frequency domain resources occupied by port 0 and port 1. For one DMRS port, 2 adjacent REs occupied correspond to one OCC codeword sequence of length 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 employ a set of length-2 OCC codeword sequences (+1+1 and +1-1). Similarly, port 2 and port 3 are located within the same Resource Element (RE), and are mapped in the frequency domain in a comb-teeth fashion on unoccupied REs for port 0 and port 1. For subcarrier 1 and subcarrier 3, port 2 and port 3 employ a set of length-2 OCC codeword sequences (+1+1 and +1-1).
(5)OCC
OCCs can be divided into two categories: frequency domain OCC (denoted FD-OCC) and time domain OCC (denoted TD-OCC). Accordingly, the length of OCC can also be divided into two types, namely, the length of FD-OCC and the length of TD-OCC.
(6) DMRS port number expansion (expansion or enhancement)
As can be seen from the above description, in R15, the DMRS port number corresponding to type 1 is 8, and the DMRS port number corresponding to type 2 is 12. A maximum of 12 orthogonal DMRS ports can be supported. In R15, the FD-OCC length of the DMRS port is 2.
In R18, the DMRS port number corresponding to the enhanced type 1 is 16, and the DMRS port number corresponding to the enhanced type 2 is 24. Further, in R18, the FD-OCC length of the DMRS port may be 4.
Illustratively, type 1 may be denoted as type 1-E, or type 1-R18, or type 3 after enhancement; type 2 may be denoted as type 2-E, or type 2-R18, or type 4 after enhancement. It should be understood that the names after the enhancement of type 1 and type 2 are not limited in the present application.
Thus, the configuration type corpus corresponding to the R18 DMRS port higher layer signaling may be: type 1, type 2, type 1-E, type 2-E.
(7) DMRS configuration type
Fig. 2 shows DMRS patterns (patten) of two configuration types. REs of different fill patterns in fig. 2 represent different CDM groups; p0, P1, …, P11 denote DMRS port 0 to DMRS port 11; the numbers on the horizontal axis represent the index of symbols within one slot and the numbers on the vertical axis represent the index of subcarriers within one RB.
It should be understood that the DMRS occupied symbol 0 and occupied symbols 0 and 1 in fig. 2 are only examples, and the symbol occupied by the DMRS in one slot may be other symbols, such as occupied symbol 1, or occupied symbols 1 and 2.
Referring to fig. 2 (a), for a single symbol DMRS of configuration type 1, a maximum of 4 orthogonal DMRS ports are supported. The 4 DMRS ports are divided into 2 CDM groups (CDM group 0 and CDM group 1), each CDM group supporting a maximum of 2 orthogonal DMRS ports. Wherein CDM group 0 includes DMRS ports P0 and P1, and CDM group1 includes P2 and P3. Frequency division multiplexing (Frequency Division Multiplexing, FDM) between CDM groups (mapped on different frequency domain resources); DMRS ports included in CMD group are mapped on the same time domain resource (resource mapping is performed in a comb-tooth manner in the frequency domain). The reference signals corresponding to the DMRS ports contained in the CDM group are distinguished by an orthogonal cover code (orthogonal cover code, OCC), so that orthogonality of the DMRS ports in the CDM group is ensured.
Referring to fig. 2 (b), the dual-symbol DMRS of configuration type 1 supports a maximum of 8 orthogonal DMRS ports. The 8 DMRS ports belong to 2 CDM groups (CDM group0 and CDM group 1). Wherein CDM group0 comprises P0, P1, P4 and P5; CDM group 1 comprises P2, P3, P6 and P7. P0, P1, P4 and P5 are located in the same RE, and resource mapping is performed in a comb tooth mode in a frequency domain. Similarly, P2, P3, P6 and P7 are located in the same RE and mapped on the unoccupied subcarriers of P0, P1, P4 and P5 in a comb-tooth manner in the frequency domain. For one DMRS port, 2 adjacent subcarriers and 2 OFDM symbols occupied correspond to one OCC sequence of length 4 (can be derived with reference to table 1).
Fig. 2 (c) and (d) correspond to the time-frequency resource mapping manner of the single-symbol DMRS and the double-symbol DMRS of configuration type 2, respectively. As shown in fig. 2 (c), a single symbol DMRS of configuration type 2 supports a maximum of 6 orthogonal DMRS ports. The 6 DMRS ports belong to 3 CDM groups (CDM group 0, CDM group 1 and CDM group 2). As shown in fig. 2 (d), for a dual symbol DMRS of configuration type 2, a maximum of 12 orthogonal DMRS ports are supported. The 12 DMRS ports belong to 3 CDM groups (CDM group 0, CDM group 1 and CDM group 2). For brevity, the CDM group configuring the DMRS of type 2 and the time-frequency resource occupied by each DMRS port are omitted.
In each data transmission process, the network device needs to inform the terminal device of the allocated antenna port (DMRS port) and the configuration type of the DMRS. Therefore, the terminal equipment can receive the DMRS signal and perform channel estimation flow on the corresponding time-frequency resources according to the DMRS symbol generation method and the time-frequency resource mapping rule defined by the protocol based on the allocated antenna ports.
The manner in which the allocated DMRS port index is dynamically notified by higher layer signaling (e.g., radio resource control (radio resource control, RRC) signaling, semi-statically configuring DMRS types, and downlink control information (downlink control information, DCI) is currently defined in the NR protocol:
step one, RRC signaling configures DMRS configuration type and occupation symbol number
For example, the network device configures the configuration Type of the DMRS through higher layer signaling DMRS-DownlinkConfig, wherein a DMRS-Type field may be used to indicate whether the DMRS is Type 1 or Type 2; the maxLength field may be used to indicate whether a single-symbol DMRS or a dual-symbol DMRS is employed. If the configuration maxLength is len2, it is further indicated by DCI whether to use a single-symbol DMRS or a dual-symbol DMRS; if maxLength field is not configured, a single symbol DMRS is employed.
Step two, DCI signaling notification
The DCI signaling includes an Antenna port field, which may be used to indicate an allocated DMRS port index. For the values of different DMRS-Type and maxLength configurations, the NR protocol defines multiple DMRS port calling modes. Tables 3 to 6 respectively show the configuration tables of the DMRS port calling modes corresponding to DMRS-type=1, maxLength =1, DMRS-type=1, maxLength =2, DMRS-type=2, maxLength =1 and DMRS-type=2, maxLength =2. Wherein the Antenna port field indicates a column of "index values" in the table, each index value corresponding to one or more DMRS ports.
Table 3 (dmrs-type=1, maxLength =1)
Table 4 (dmrs-type=1, maxLength =2)
Table 5 (dmrs-type=2, maxLength =1)
Table 6 (dmrs-type=2, maxLength =2)
That is, the terminal device may determine the following information through DCI signaling transmitted from the network device in combination with tables 3 to 6:
1. Index of DMRS port
In tables 3 to 6, an "index value" can be obtained from a value indicated by the "Antenna port" field in DCI, and "DMRS port (ports)" can be obtained from the "index value". For example, if the terminal device obtains "Antenna port" =3 by parsing DCI in a certain slot, it can be known from the table look-up that DMRS port is 0, and PDSCH and DMRS indicated by the current DCI are transmitted in the Antenna port 1000.
2. Number of symbols occupied by DMRS
The number of symbols occupied by a DMRS may be indicated by a "preamble symbol number" column in the table, for example, when the value of the "preamble symbol number" column is 1, it may indicate that the number of symbols occupied by a DMRS is 1, or that the DMRS is a single symbol DMRS; when the value of the "preamble symbol number" column is 2, it indicates that the number of symbols occupied by the DMRS is 2, or that the DMRS is a dual symbol DMRS.
3. Number of CDM groups without data
The number of CDM groups without data may be indicated by the "number of DMRS code division multiplexing CDM groups without data" column in tables 3 to 6. According to different DMRS configuration types, the field may take three values of 1, 2 and 3.
Illustratively, when the value is 1, it may be indicated that the RE of the current CDM group 0 does not transmit data. For example, when the current time slot schedules a port belonging to CDM group 0, the REs of the current CDM group 0 do not transmit data, and REs which are not mapped to DMRS on symbols occupied by the currently scheduled DMRS may be scheduled to the data; when the value is 2, it may be indicated that REs of the current CDM group 0 and CDM group 1 do not transmit data; when the value is 3, no data is transmitted for REs indicating the current CDM group 0, CDM group 1, and CDM group 2.
(8) First port set, second port set, and subset of second port set
Wherein, two long-wavelength frequency domain mask sequences corresponding to any two ports in the first port set are mutually orthogonal, and four long-wavelength frequency domain mask sequences corresponding to any two ports in the second port set are mutually orthogonal. The two long-code frequency-domain mask sequences include frequency-domain mask sequences corresponding to 2 consecutive subcarriers within one CDM group, and the four long-code frequency-domain mask sequences include frequency-domain mask sequences corresponding to 4 consecutive subcarriers within one CDM group. The frequency domain mask sequence corresponding to any one port in the subset of the second port set is different from the frequency domain mask sequence corresponding to any one port in the first port set. Illustratively, the first port set may be understood as an R15 port index set. The second port set may be understood as the R18 port index set. The first port set only includes the port index defined in R15, and the FD-OCC length corresponding to the port index in the first port set is 2. The port index of R18 is included in the second port set, the subset of the second port set includes the port index of R18 newly added relative to the port index of R15, that is, the port index of type 3 or type 4 added compared with the port index of type1 or type 2 respectively, and the FD-OCC length corresponding to the port index of the second port set is 4.
Fig. 1 illustrates an exemplary architecture diagram of a communication system 100 to which embodiments of the present application are applicable. As shown in fig. 1, the communication system 100 may include at least one network device, such as the network device 101 shown in fig. 1. The communication system 100 may also include at least one terminal device, such as the terminal devices 102-107 shown in fig. 1. Wherein the terminal devices 102 to 107 may be mobile or stationary. Network device 101 may provide communication coverage for a particular geographic area and terminal devices 102-107 may be terminal devices located within the coverage area. One or more of network device 101 and terminal devices 102-107 may each communicate over a wireless link.
Alternatively, the terminal devices may communicate directly with each other. Direct communication between terminal devices may be implemented, for example, using device-to-device (D2D) technology or the like. As shown in fig. 1, communication may be directly performed between the terminal device 105 and the terminal device 106, and between the terminal device 105 and the terminal device 107 using D2D technology. Terminal device 106 and terminal device 107 may communicate with terminal device 105 separately or simultaneously.
Terminal devices 105 to 107 may also communicate with network device 101, respectively. For example, may communicate directly with network device 101, as terminal devices 105 and 106 in the figures may communicate directly with network device 101; or indirectly with the network device 101, as in the figure the terminal device 107 communicates with the network device 101 via the terminal device 105.
Each communication device in the communication system 100 shown in fig. 1 may be configured with multiple antennas. The plurality of antennas configured may include, for each communication device, at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Accordingly, communication can be performed by MIMO technology between the communication devices in the communication system 100.
It should be appreciated that fig. 1 is a simplified schematic diagram that is merely illustrative for ease of understanding, and that other network devices or other terminal devices may be included in the communication system 100, which are not shown in fig. 1.
The method for transmitting and receiving the reference signal according to the embodiment of the present application will be described in detail with reference to the accompanying drawings by taking the reference signal as an example. It should be appreciated that the transmitting end device may correspond to, for example, network device 101 in fig. 1, and the receiving end device may correspond to any one of a plurality of terminal devices in fig. 1 communicatively coupled to the network device, for example, any one of terminal devices 102-107 in fig. 1.
With the development of the 5G multi-antenna technology, the number of transmission layers of the data stream increases, and the number of DMRS ports corresponding to the number increases sharply. An efficient way to extend DMRS ports is to introduce new DMRS ports by code division multiplexing, such as the implementation methods shown in tables 7-10. Specifically, tables 7 to 10 are illustrated by taking a single symbol Type2 DMRS as an example. Wherein, table 7 and table 8 correspond to DMRS port configurations of the existing NR protocol, table 7 is a subcarrier identification (or index) occupied by the DMRS and a corresponding port index, and table 8 uses port 0 and port 1 as an example, and describes a corresponding DMRS mask design manner. For example, for DMRS ports P0 and P1, the number of frequency domain subcarriers occupied in one RB is {0,1,6,7}, the frequency domain mask sequence corresponding to the P0 port is { +1, +1}, the mask sequence corresponding to the P1 port is { +1, -1, +1, -1}, the time-frequency resource occupied by the P1 port and the P0 port are the same, and the same time-frequency resource is transmitted with the P0 port through code division orthogonality. Table 9 shows the FD-OCC capacity expansion scheme for R18 DMRS. On the same time-frequency resource, for example, for CDM group 0, the R18 port multiplexes a group of ports (single symbol 2 port, double symbol 4 port) by code division multiplexing within the same time-frequency resource as compared with the R15 port, corresponding to P12 and P13 in table 9, and the mask sequences corresponding to subcarrier numbers {0,1,6,7} are { +1, +j, -1, -j } and { +1, -j, -1, +j } as shown in table 10. The remaining CDM groups are multiplexed in the same manner as CDM group 0. By the technical means, the effect of doubling the total number of the DMRS ports multiplexed in the same time-frequency resource can be achieved.
TABLE 7
| 0 | 0 1 |
| 1 | 0 1 |
| 2 | 2 3 |
| 3 | 2 3 |
| 4 | 4 5 |
| 5 | 4 5 |
| 6 | 0 1 |
| 7 | 0 1 |
| 8 | 2 3 |
| 9 | 2 3 |
| 10 | 4 5 |
| 11 | 4 5 |
TABLE 8
| Re | P0 | P1 |
| 0 | +1 | +1 |
| 1 | +1 | -1 |
| 6 | +1 | +1 |
| 7 | +1 | -1 |
TABLE 9
Table 10
| Re | P0 | P1 | P12 | P13 |
| 0 | +1 | +1 | +1 | +1 |
| 1 | +1 | -1 | +j | -j |
| 6 | +1 | +1 | -1 | -1 |
| 7 | +1 | -1 | -j | +j |
The capacity expansion method can be naturally expanded to a single/double symbol configuration Type and a Type1/2 DMRS configuration Type through the same sequence and mapping mode. The mapping relationship between the DMRS port and the time-frequency resource corresponding to the capacity expansion mode has the following three schemes. The DFT sequence uplink DMRS time-frequency resource and sequence design corresponding to scheme 1 correspond to formula (7), table 11 (type 1 r 18) and table 12 (type 2 r 18). The Walsh sequence corresponding to scheme 2 is designed for the downlink DMRS time-frequency resource and sequence, and corresponds to equation (8), table 13 (type 1R 18), and table 14 (type 2R 18). Scheme 3 corresponds to FD-OCC expansion, corresponding to equation (9) and table 15.
Scheme 1:
where p is the DMRS port index, μ is the subcarrier spacing parameter, For mapping to the reference signal symbol corresponding to DMRS port p on resource element RE with index (k, l),As a power factor, w t (l ') is a time domain mask corresponding to a time domain symbol with an index of l ', w f (f) is a frequency domain mask corresponding to a subcarrier with an index of k ', f=2· (n mod 2) +k ', m=2n+k ', m is an m-th element in the DMRS sequence, l represents an orthogonal frequency division multiplexing OFDM symbol index contained in one slot,The symbol index of the start time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol, and Δ is a subcarrier offset factor.
TABLE 11
Table 12
Scheme 2:
where p is the DMRS port index, μ is the subcarrier spacing parameter, For the DMRS symbol corresponding to DMRS port p mapped to resource element RE with index (k, l),W t (l ') is a time domain mask corresponding to a time domain symbol with index of l', w f (k ') is a frequency domain mask corresponding to a subcarrier with index of k', l represents an orthogonal frequency division multiplexing OFDM symbol index contained in one slot,The symbol index of the start time domain symbol occupied by the DMRS symbol or the symbol index of the reference time domain symbol, and Δ is a subcarrier offset factor.
TABLE 13
TABLE 14
Scheme 3:
Where p is the index of the DMRS port, μ is the subcarrier spacing parameter, For the DMRS symbol corresponding to DMRS port p mapped to resource element RE with index (k, l),For the power factor, w t (l ') is the time domain mask sequence element corresponding to the time domain symbol with index l', w f (k ') is the frequency domain mask element corresponding to the subcarrier with index k', delta is the subcarrier offset factor,B (n mod 2) is an outer mask sequence for a symbol index of a start time domain symbol or a symbol index of a reference time domain symbol occupied by the DMRS symbol, wherein b (0) =1, b (1) =1 for an R15 existing DMRS port; for the newly added DMRS port of R18, b (0) =1, b (1) = -1, or b (0) = -1, b (1) =1.
TABLE 15
According to the above port index and the corresponding time-frequency resource mapping manner, the time-frequency resource mapping of the R18 DMRS port can be intuitively shown in the following tables 16 to 19. Wherein tables 16 to 19 correspond to type1 single symbol, type1 double symbol, type2 single symbol, and type2 double symbol, respectively.
Table 16
| 11 | 2 3 10 11 |
| 10 | 0 1 8 9 |
| 9 | 2 3 10 11 |
| 8 | 0 1 8 9 |
| 7 | 2 3 10 11 |
| 6 | 0 1 8 9 |
| 5 | 2 3 10 11 |
| 4 | 0 1 8 9 |
| 3 | 2 3 10 11 |
| 2 | 0 1 8 9 |
| 1 | 2 3 10 11 |
| 0 | 0 1 8 9 |
TABLE 17
TABLE 18
| 11 | 4 5 16 17 |
| 10 | 4 5 16 17 |
| 9 | 2 3 14 15 |
| 8 | 2 3 14 15 |
| 7 | 0 1 12 13 |
| 6 | 0 1 12 13 |
| 5 | 4 5 16 17 |
| 4 | 4 5 16 17 |
| 3 | 2 3 14 15 |
| 2 | 2 3 14 15 |
| 1 | 0 1 12 13 |
| 0 | 0 1 12 13 |
TABLE 19
| 11 | 4 5 10 11 16 17 22 23 | 4 5 10 11 16 17 22 23 |
| 10 | 4 5 10 11 16 17 22 23 | 4 5 10 11 16 17 22 23 |
| 9 | 2 3 8 9 14 15 20 21 | 2 3 8 9 14 15 20 21 |
| 8 | 2 3 8 9 14 15 20 21 | 2 3 8 9 14 15 20 21 |
| 7 | 0 1 6 7 12 13 18 19 | 0 1 6 7 12 13 18 19 |
| 6 | 0 1 6 7 12 13 18 19 | 0 1 6 7 12 13 18 19 |
| 5 | 4 5 10 11 16 17 22 23 | 4 5 10 11 16 17 22 23 |
| 4 | 4 5 10 11 16 17 22 23 | 4 5 10 11 16 17 22 23 |
| 3 | 2 3 8 9 14 15 20 21 | 2 3 8 9 14 15 20 21 |
| 2 | 2 3 8 9 14 15 20 21 | 2 3 8 9 14 15 20 21 |
| 1 | 0 1 6 7 12 13 18 19 | 0 1 6 7 12 13 18 19 |
| 0 | 0 1 6 7 12 13 18 19 | 0 1 6 7 12 13 18 19 |
Currently, one important difference between the DMRS port indication corresponding to uplink PUSCH transmission and downlink is that the number of downlink scheduling layers is indicated jointly according to the DMRS port, and the number of uplink scheduling layers is indicated separately from the DMRS port. Thus, the PUSCH DMRS port indication table is defined for different rank numbers by the existing standards as follows in tables 20 to 35.
For DMRS configuration of 'Type1, maxlength =1', tables 20 to 23 correspond to DMRS port combination indication tables at rank 1/2/3/4, respectively.
Table 20 (dmrs-type=1, maxLength =1, rank=1)
Table 21 (dmrs-type=1, maxLength =1, rank=2)
Table 22 (dmrs-type=1, maxLength =1, rank=3)
Table 23 (dmrs-type=1, maxLength =1, rank=4)
Similarly, for DMRS configuration of 'Type1, maxlength =2', tables 24 to 27 correspond to DMRS port combination indication tables at rank 1/2/3/4, respectively.
Table 24 (dmrs-type=1, maxLength =2, rank=1)
Table 25 (dmrs-type=1, maxLength =2, rank=2)
Table 26 (dmrs-type=1, maxLength =2, rank=3)
Table 27 (dmrs-type=1, maxLength =2, rank=3)
Similarly, for DMRS configuration of 'Type2, maxlength =1', tables 28 to 31 correspond to DMRS port combination indication tables at rank 1/2/3/4, respectively.
Table 28 (dmrs-type=2, maxLength =1, rank=1)
Table 29 (dmrs-type=2, maxLength =1, rank=2)
Table 30 (dmrs-type=2, maxLength =1, rank=3)
Table 31 (dmrs-type=2, maxLength =1, rank=4)
Similarly, for DMRS configuration of 'Type2, maxlength =2', tables 32 to 35 correspond to DMRS port combination indication tables at rank 1/2/3/4, respectively.
Table 32 (dmrs-type=2, maxLength =2, rank=1)
Table 33 (dmrs-type=2, maxLength =2, rank=2)
Table 34 (dmrs-type=2, maxLength =2, rank=3)
Table 35 (dmrs-type=2, maxLength =2, rank=4)
In summary, there are 2 significant problems in the DMRS indication for rank >4 (the number of DMRS ports included in a single DMRS combination) in the antenna port indication field currently. Firstly, the implementation complexity of the terminal device is not considered, that is, the DMRS ports corresponding to the 2 codewords respectively correspond to 2 different CDM groups (leading single symbol DMRS) or the DMRS ports corresponding to the 2 codewords respectively correspond to 2 different TD-OCCs (leading single/double symbol DMRS). In addition, the compatibility with the R15 port is not considered, and only the R18 terminal of the R15 DMRS is supported, which will not be used when configuring the R18 newly added port.
In view of this, the present application provides a method for indicating reference signal ports, which reduces UE implementation complexity and improves channel estimation performance by associating DMRS ports corresponding to each codeword with the same DMRS CDM group or TD-OCC. Meanwhile, by preferentially using the newly added port of R18, the compatibility of the port of R15 is ensured, the MU-MIMO multiplexing capability is improved, and the spectrum efficiency is further improved.
The method for transmitting and receiving the reference signal according to the embodiment of the present application will be described in detail with reference to the accompanying drawings by taking the reference signal as an example. It should be understood that, in the following method, the network device may correspond to, for example, the network device 101 in fig. 1, and it should be noted that, in the embodiment of the present application, the reference signal is taken as an example of DMRS, and the technical solution of the embodiment of the present application is described, which should not limit the present application in any way. The reference signal in the present application may be any reference signal that may be used as a channel estimate, such as a cell-SPECIFIC REFERENCE SIGNAL, CRS, or other reference signals that may be used to perform the same or similar functions. In future communication systems, the name of the reference signal may be changed, but the technical solution of the present application should be applied as long as it is essentially indistinguishable from DMRS.
Fig. 3 shows a schematic flow chart of a method 300 for indicating a reference signal port according to an embodiment of the present application. The method 300 may include a number of steps as follows.
S310, the sending end device sends first indication information to the receiving end device, wherein the first indication information indicates a first index.
S320, the transmitting terminal equipment transmits the reference signal based on a plurality of ports corresponding to a plurality of reference signal port indexes corresponding to the first index.
S330, the receiving end device receives the reference signals based on a plurality of ports corresponding to the plurality of reference signal port indexes corresponding to the first index.
Specifically, the first indication information indicates a first index, and the first index corresponds to a plurality of reference signal port indexes. Wherein, a plurality of reference signal port indexes corresponding to the first index are associated with a plurality of codewords. The plurality of codewords includes a first codeword, and the plurality of reference signal port indexes associated with the first codeword correspond to the same CDM group or the plurality of reference signal port indexes associated with the first codeword correspond to the same TD-OCC.
It should be noted that, when the configuration of the reference signal is single symbol, the plurality of reference signal port indexes associated with the first codeword correspond to the same CDM group, and when the configuration of the reference signal is double symbol, the plurality of reference signal port indexes associated with the first codeword correspond to the same TD-OCC. The CDM group and the TD-OCC may be described with reference to the foregoing, and are not repeated herein.
It may be appreciated that, when the first indication information is an indication field in a downlink control signaling (downlink control information, DCI), the first index corresponds to a value of an antenna port field in the DCI, and DMRS port related information is determined by the value of the antenna port field, where the DMRS port related information may include one or more of the following: DMRS port index combinations, DMRS CDM group without data, preamble number.
In some embodiments, the ports corresponding to the plurality of reference signal port indices associated with the first codeword belong to a subset of the first port set and the second port set, and the frequency domain mask sequence corresponding to any one port in the subset of the second port set is different from the frequency domain mask sequence corresponding to any one port in the first port set. Because of the adjacent 2 time-frequency resources (e.g., REs) occupied by any one port in the first port set, the length of the corresponding OCC codeword sequence is 2, and the length of the corresponding OCC codeword sequence is 4. Illustratively, one can consider a first set of ports defined for R15 DMRS ports and a second set of ports defined for R18 DMRS ports. From the foregoing description, it will be appreciated that the mapping or masking of each port in the first port set on each time-frequency resource will satisfy equation (6), while the mapping or masking of each port in the second port set on each time-frequency resource will satisfy one of equation (7), equation (8) or equation (9). Because the mapping of each port on the time-frequency resource calculated by the formula (7), the formula (8) or the formula (9) is repeated with the formula (6), in other words, the time-frequency resource occupied by some ports in the second port set in a code division multiplexing manner is the same as the time-frequency resource occupied by the ports in the first port set in a code division multiplexing manner. This is also apparent, for example, in the above table 11, the ports with port indexes 0 to 7 are the same as those in table 1 with the values corresponding to the frequency domain masks with port indexes 1000 to 1007. Therefore, when the frequency domain mask sequence corresponding to any one port in the subset of the second port set is different from the frequency domain mask sequence corresponding to any one port in the first port set, it may be understood that the time-frequency resource occupied by the port corresponding to the subset of the second port set is not coincident with the time-frequency resource occupied by the port corresponding to the first port set. Still taking table 11 and table 1 above as an example, the index of the port corresponding to the subset of the second port set is 8 to 15. In this embodiment scenario, the ports corresponding to the plurality of reference signal port indexes associated with the first codeword include both the R15 type ports or the ports in R18 that are the same as R15, and the ports that R18 has added more than R15.
In other embodiments, the ports corresponding to the plurality of reference signal port indices associated with the first codeword belong to a subset of the second port set. As can be seen from the above description, if the DMRS ports defined by the second port set for R18 are ports corresponding to the plurality of reference signal port indexes associated with the first codeword in this embodiment scenario, only ports added by R18 as compared with R15.
Based on the scheme, the mask sequences of the ports corresponding to the plurality of reference signal port indexes occupy the same time-frequency resource through code division multiplexing by dividing the plurality of reference signal port indexes associated with the same code word into the same CDM group or the same TD-OCC, so that the complexity of receiving the reference signal by the receiving terminal equipment is reduced, and the accuracy, reliability, efficiency and the like of channel estimation are further improved.
In some embodiments, a second codeword is also included in the plurality of codewords. The ports corresponding to the plurality of reference signal port indexes associated with the second codeword belong to a subset of the first port set and the second port set, or the ports corresponding to the plurality of reference signal port indexes associated with the second codeword belong to a subset of the second port set. It is to be understood that the description of the first port set, the second port set, and the subset of the second port set in the second codeword may refer to the description in the first codeword, and will not be repeated herein.
Further, considering a compatible scenario with the R15 port, for the purpose of improving MU-MIMO multiplexing capability and improving spectral efficiency, in some embodiments, the number of ports belonging to the subset of the second port set among the ports corresponding to the plurality of reference signal port indexes associated with the first codeword is configured to be a first value, where the first value is also the number of ports belonging to the subset of the second port set among the CDM group or the TD-OCC corresponding to the plurality of reference signal port indexes associated with the first codeword.
Illustratively, the above configuration is described in conjunction with the CDM and TD-OCC group diagrams corresponding to the R18 DMRS port shown in fig. 4, for the DMRS single symbol of type 1, the reference signal port index in CDM group 0 includes {0,1,8,9}, and the reference signal port index in CDM group 1 includes {2,3,10,11}; for DMRS dual symbol of type 1, the reference signal port index in CDM group 0 includes {0,1,8,9} and {4,5,12,13}, and the reference signal port index in CDM group 1 includes {2,3,10,11} and {6,7,14,15}. Meanwhile, the reference signal port indexes in the TD-OCC sequence { +1, +1} include {0,1,8,9} and {2,3,10,11}, and the reference signal port indexes in the TD-OCC sequence { +1, -1} include {4,5,12,13} and {6,7,14,15}. Accordingly, for DMRS single symbol of type 2, the reference signal port index in CDM group 0 includes {0,1,12,13}, the reference signal port index in CDM group 1 includes {2,3,14,15}, and the reference signal port index in CDM group 2 includes {4,5,16,17}; for DMRS dual symbol of type 2, the reference signal port index in CDM group 0 includes {0,1,12,13} and {6,7,18,19}, the reference signal port index in CDM group 1 includes {2,3,14,15} and {8,9,20,21}, and the reference signal port index in CDM group 2 includes {4,5,16,17} and {10,11,22,23}. Meanwhile, the reference signal port index in the TD-OCC sequence { +1, +1} includes {0,1,12,13}, {2,3,14,15} and {4,5,16,17}, and the reference signal port index in the TD-OCC sequence { +1, -1} includes {6,7,18,19}, {8,9,20,21} and {10,11,22,23}. Further, the DMRS port index outlined in fig. 4 is a first port set index including {0,1} and {4,5} and {2,3} and {6,7} in CDM group 0 under DMRS double symbol of type 1, and {0,1} and {6,7} in CDM group 0,2, 3} and {8,9} in CDM group 1, and {4,5} and {10,11} in CDM group 2 under DMRS double symbol of type 2.
Specifically, when the DMRS type is 1 and the maximum length is 1, if the DMRS port indexes correspond to CDM group 0, the DMRS indexes are {0,1,8,9}, where the number of ports belonging to the subset of the second port set is 2, that is, the port indexes are {8,9} corresponding ports, and at this time, the number of ports belonging to the subset of the second port set in the ports corresponding to the first codeword associated with the DMRS index should be configured to be {0,1,8,9} is 2.
Still further, to prioritize use of ports corresponding to a subset of the second port set, such as R18 newly added ports, in some embodiments, the ports corresponding to the plurality of reference signal port indices associated with the first codeword are configured to be the same as the ports corresponding to the first CDM group or the first TD-OCC in the subset of the second port set (i.e., the ports belonging to the subset of the second port set in the CDM group or the TD-OCC corresponding to the plurality of reference signal port indices associated with the first codeword).
For example, still taking DMRS type 1, maximum length 1, and CDM group 0 corresponding to multiple DMRS port indexes as an example, in this scenario, the CDM group corresponding to multiple reference signal port indexes associated with the first codeword or the ports belonging to the subset of the second port set in the TD-OCC are configured to be the ports corresponding to the indexes {8,9 }.
According to the above design criteria, the DMRS port combination indication table designed by the present application is shown by way of example in tables 36 to 39, and the DMRS port combination indication table may be understood as an antenna port field in DCI signaling. Wherein, table 36 is DMRS configuration for 'Type1, maxlength =1', table 37 is DMRS configuration for 'Type1, maxlength =2', table 38 is DMRS configuration for 'Type2, maxlength =1', and table 39 is DMRS configuration for 'Type2, maxlength =2'.
Table 36 (dmrs-type=1, maxLength =1)
Table 37 (dmrs-type=1, maxLength =2)
Table 38 (dmrs-type=2, maxLength =1)
Table 39 (dmrs-type=2, maxLength =2)
It will be appreciated that the DMRS scheduling indications shown in tables 36 to 39 above are merely examples and should not be construed as limiting the present application in any way.
The above tables 36 to 39 are DMRS scheduling indication during downlink transmission, and the following tables 40 to 55 illustrate DMRS port combination indication tables designed according to the scheme of the present application, which may be understood as antenna port fields in DCI signaling.
For DMRS configuration of 'Type1, maxlength =1', tables 40 to 43 correspond to DMRS port combination indication tables at rank 5/6/7/8, respectively.
Table 40 (dmrs-type=1, maxLength =1, rank=5)
Table 41 (dmrs-type=1, maxLength =1, rank=6)
Table 42 (dmrs-type=1, maxLength =1, rank=7)
Table 43 (dmrs-type=1, maxLength =1, rank=8)
For DMRS configuration of 'Type1, maxlength =2', tables 44 to 47 correspond to DMRS port combination indication tables at rank 5/6/7/8, respectively.
Table 44 (dmrs-type=1, maxLength =2, rank=5)
Table 45 (dmrs-type=1, maxLength =2, rank=6)
Table 46 (dmrs-type=1, maxLength =2, rank=7)
Table 47 (dmrs-type=1, maxLength =2, rank=8)
For DMRS configuration of 'Type2, maxlength =1', tables 48 to 51 correspond to DMRS port combination indication tables at rank 5/6/7/8, respectively.
Table 48 (dmrs-type=2, maxLength =1, rank=5)
Table 49 (dmrs-type=2, maxLength =1, rank=6)
Table 50 (dmrs-type=2, maxLength =1, rank=7)
Table 51 (dmrs-type=2, maxLength =1, rank=8)
For DMRS configuration of 'Type2, maxlength =2', tables 52 to 55 correspond to DMRS port combination indication tables at rank 5/6/7/8, respectively.
Table 52 (dmrs-type=2, maxLength =2, rank=5)
Table 53 (dmrs-type=2, maxLength =2, rank=6)
Table 54 (dmrs-type=2, maxLength =2, rank=7)
Table 55 (dmrs-type=2, maxLength =2, rank=8)
It will be appreciated that the DMRS scheduling indications shown in the foregoing tables 40 to 55 are merely examples, and should not be construed as limiting the present application in any way.
In the scheme of the present application, when the transmitting end device configures the DMRS port for the receiving end device, if the configured DMRS port includes the first port set, the transmitting end device preferentially selects the non-0 port.
It should be noted that, when the receiving end device determines the DMRS indication manner, the receiving end device also needs to acquire the reference signal type and the maximum length, so the method 300 provided in the embodiment of the present application further includes step S340.
S340, the transmitting end device sends second indication information to the receiving end device, wherein the second indication information indicates reference signal configuration information corresponding to the reference signal, and the reference signal configuration information comprises a reference signal type and a maximum length.
Specifically, after the receiving end device acquires the first indication information and the second indication information, the indication mode of the DMRS is determined.
It should be further noted that, in the above method 300, only the downlink first-come is taken as an example, when uplink transmission is performed, the receiving end device determines, based on the first index indicated by the received first indication information, that a plurality of ports corresponding to the port indexes of the plurality of reference signals corresponding to the first index send reference signals to the transmitting end device, and correspondingly, the transmitting end device receives the reference signals based on a plurality of ports corresponding to the port indexes of the plurality of reference signals corresponding to the first index.
The method for transmitting the reference signal provided by the embodiment of the present application is described in detail above with reference to fig. 3 and 4. The following describes a communication device, a network device, and a terminal device provided by the present application with reference to fig. 5 to 8.
Fig. 5 shows a schematic diagram of a communication device 500 according to an embodiment of the application.
The communication device 400 comprises a transceiver unit 510 and a processing unit 520, wherein the transceiver unit 510 may be used for implementing corresponding communication functions, the transceiver unit 510 may also be referred to as a communication interface or a communication unit, and the processing unit 520 may be used for performing data processing.
Optionally, the communication apparatus 500 further includes a storage unit, where the storage unit may be configured to store instructions and/or data, and the processing unit 520 may read the instructions and/or data in the storage unit, so that the apparatus implements the actions of the network device in the foregoing method embodiments.
In one possible design, the communication apparatus 500 may implement steps or flows corresponding to those performed by the network device in the above method embodiments. The transceiver unit 510 may be configured to perform operations related to the transceiving of the network device in the above method embodiment, such as the transceiving related operations of the network device in the embodiment shown in fig. 3; the processing unit 520 may be configured to perform the operations related to the processing of the network device in the above method embodiment, such as the operations related to the processing of the network device in the embodiment shown in fig. 3.
In another possible design, the communication device 500 may be a terminal device in the foregoing embodiment, or may be a component (such as a chip) of the terminal device. The communication apparatus 500 may implement steps or procedures performed corresponding to the terminal device in the above method embodiment. The transceiver unit 510 may be configured to perform operations related to the transceiving of the terminal device in the above method embodiment, such as the transceiving related operations of the terminal device in the embodiment shown in fig. 3; the processing unit 520 may be configured to perform the operations related to the processing of the terminal device in the above method embodiment, such as the operations related to the processing of the terminal device in the embodiment shown in fig. 3.
Fig. 6 is a schematic block diagram of a communication device 600 provided by an embodiment of the present application. The apparatus 600 includes a processor 610, the processor 610 being coupled to a memory 630. Optionally, a memory 630 is further included for storing computer programs or instructions and/or data, and the processor 610 is configured to execute the computer programs or instructions stored in the memory 630, or to read the data stored in the memory 630, to perform the methods in the method embodiments above.
Optionally, the processor 610 is one or more.
Optionally, the memory 630 is one or more.
Optionally, the memory 630 is integrated with the processor 610 or separately provided.
Optionally, as shown in fig. 6, the apparatus 600 further comprises a transceiver 620, the transceiver 620 being used for receiving and/or transmitting signals. For example, the processor 610 is configured to control the transceiver 620 to receive and/or transmit signals.
As an aspect, the apparatus 600 is configured to implement the operations performed by the network device in the above method embodiments.
For example, the processor 610 is configured to execute computer programs or instructions stored in the memory 630 to implement the relevant operations of the network device in the method embodiments above. For example, the method performed by the network device in the embodiment shown in fig. 3.
When the communication apparatus 600 is a network device, for example, a base station. Fig. 7 shows a simplified schematic diagram of a base station structure. The base station includes a portion 710 and a portion 720. The 710 part is mainly used for receiving and transmitting radio frequency signals and converting the radio frequency signals and baseband signals; the 720 part is mainly used for baseband processing, control of the base station and the like. Portion 710 may be generally referred to as a transceiver unit, transceiver circuitry, or transceiver, etc. Portion 720 is typically a control center of the base station, and may be generally referred to as a processing unit, for controlling the base station to perform the processing operations on the network device side in the above method embodiment.
The transceiver unit of section 710, which may also be referred to as a transceiver or transceiver, includes an antenna and radio frequency circuitry, wherein the radio frequency circuitry is primarily for performing radio frequency processing. Alternatively, the device for implementing the receiving function in the portion 710 may be regarded as a receiving unit, and the device for implementing the transmitting function may be regarded as a transmitting unit, i.e., the portion 710 includes the receiving unit and the transmitting unit. The receiving unit may also be referred to as a receiver, or a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, or a transmitting circuit, etc.
Portion 720 may include one or more boards, each of which may include one or more processors and one or more memories. The processor is used for reading and executing the program in the memory to realize the baseband processing function and control of the base station. If there are multiple boards, the boards can be interconnected to enhance processing power. As an alternative implementation manner, the multiple boards may share one or more processors, or the multiple boards may share one or more memories, or the multiple boards may share one or more processors at the same time.
For example, in one implementation, the transceiver unit of portion 710 is configured to perform the steps related to the transceiver performed by the network device in the embodiment shown in fig. 3; portion 720 is used to perform the steps associated with the processing performed by the network device in the embodiment shown in fig. 3.
It should be understood that fig. 7 is only an example and not a limitation, and that the above-described network device including the transceiver unit and the processing unit may not depend on the structure shown in fig. 7.
When the communication device 600 is a chip, the chip includes a transceiver unit and a processing unit. The receiving and transmitting unit can be an input and output circuit and a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit on the chip.
Alternatively, the communication apparatus 600 is configured to implement the operations performed by the terminal device in the above method embodiments.
For example, the processor 610 is configured to execute computer programs or instructions stored in the memory 630 to implement the relevant operations of the terminal device in the above respective method embodiments. For example, the method performed by the terminal device in the embodiment shown in fig. 3.
In implementation, the steps of the above method may be performed by integrated logic circuitry in hardware or instructions in software in the processor 610. The method disclosed in connection with the embodiments of the present application may be directly embodied as a hardware processor executing or may be executed by a combination of hardware and software modules in the processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 630, and the processor 610 reads the information in the memory 630 and, in combination with its hardware, performs the steps of the method described above. To avoid repetition, a detailed description is not provided herein.
When the communication apparatus 600 is a terminal device, fig. 8 shows a simplified schematic structure of the terminal device. The terminal device is illustrated as a mobile phone in fig. 8, which is convenient for understanding and illustration. As shown in fig. 8, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is mainly used for storing software programs and data. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user. It should be noted that some kinds of terminal apparatuses may not have an input/output device.
When data need to be sent, the processor carries out baseband processing on the data to be sent and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit carries out radio frequency processing on the baseband signal and then sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor are shown in fig. 8, and in an actual end device product, one or more processors and one or more memories may be present. The memory may also be referred to as a storage medium or storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, as the application is not limited in this regard.
In the embodiment of the application, the antenna and the radio frequency circuit with the receiving and transmitting functions can be regarded as a receiving and transmitting unit of the terminal equipment, and the processor with the processing function can be regarded as a processing unit of the terminal equipment.
As shown in fig. 8, the terminal device includes a transceiving unit 810 and a processing unit 820. The transceiver unit 810 may also be referred to as a transceiver, transceiver device, etc. The processing unit 820 may also be referred to as a processor, processing board, processing module, processing device, etc.
Alternatively, the device for implementing the receiving function in the transceiver unit 810 may be regarded as a receiving unit, and the device for implementing the transmitting function in the transceiver unit 86 may be regarded as a transmitting unit, that is, the transceiver unit 810 includes a receiving unit and a transmitting unit. The transceiver unit may also be referred to as a transceiver, transceiver circuitry, or the like. The receiving unit may also be referred to as a receiver, or receiving circuit, among others. The transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.
For example, in one implementation, the transceiver unit 810 is configured to perform the receiving operation of the terminal device in fig. 3. The processing unit 820 is configured to perform the processing actions on the terminal device side in fig. 3.
It should be understood that fig. 8 is only an example and not a limitation, and the above-described terminal device including the transceiving unit and the processing unit may not depend on the structure shown in fig. 8.
When the communication device 600 is a chip, the chip includes a transceiver unit and a processing unit. The receiving and transmitting unit can be an input and output circuit or a communication interface; the processing unit may be an integrated processor or microprocessor or an integrated circuit on the chip.
The embodiment of the application also provides a network device, which comprises: a processor coupled to a memory for storing a program or instructions that, when executed by the processor, cause the network device to perform the method of transmitting a reference signal as claimed in any preceding claim.
The embodiment of the application also provides a network device which comprises a receiving and transmitting unit and a processing unit. The transceiver unit may be configured to perform the steps of transmitting and receiving by the network device in the above-described method embodiment. The processing unit may be configured to perform steps of the network device other than transmitting and receiving in the above-described method embodiments.
Embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program or instructions, which when executed cause a computer to perform transmitting a reference signal as claimed in any preceding claim.
The embodiment of the application also provides a computer program product, which comprises: computer program code which, when run on a computer, causes the computer to perform the method performed by the network device as described above.
The embodiment of the application also provides a computer program product, which comprises: computer program code which, when run on a computer, causes the computer to perform the method performed by the terminal device as described above.
The embodiment of the application also provides a communication system which comprises the network equipment and the terminal equipment in the embodiment.
As one example, the communication system includes: the network device and the terminal device in the embodiments described above in connection with fig. 3 to 8.
Any explanation and beneficial effects of the related content in any of the communication devices provided above may refer to the corresponding method embodiments provided above, and are not described herein.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (36)
1. A method of indicating a reference signal port, comprising:
The method comprises the steps that a sending end device sends first indication information to a receiving end device, wherein the first indication information indicates a first index, the first index corresponds to a plurality of reference signal port indexes, the plurality of reference signal port indexes are associated with a plurality of code words, the plurality of reference signal port indexes associated with a first code word in the plurality of code words correspond to the same Code Division Multiplexing (CDM) group, or the plurality of reference signal port indexes associated with the first code word correspond to the same time domain orthogonal mask (TD-OCC), and the first code word is one of the plurality of code words;
the transmitting end device transmits reference signals with the receiving end device based on a plurality of ports corresponding to the plurality of reference signal port indexes.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
The ports corresponding to the plurality of reference signal port indexes associated with the first code word belong to a subset of a second port set and a first port set, or the ports corresponding to the plurality of reference signal port indexes associated with the first code word belong to a subset of the second port set, two long-wavelength frequency domain mask sequences corresponding to any two ports in the first port set are mutually orthogonal, four long-wavelength frequency domain mask sequences corresponding to any two ports in the second port set are mutually orthogonal, the two long-wavelength frequency domain mask sequences comprise frequency domain mask sequences corresponding to 2 continuous subcarriers in one CDM group, the four long-wavelength frequency domain mask sequences comprise frequency domain mask sequences corresponding to 4 continuous subcarriers in one CDM group, and the frequency domain mask sequence corresponding to any one port in the subset of the second port set is different from the frequency domain mask sequence corresponding to any one port in the first port set.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
The number of ports belonging to a subset of the second port set among the ports corresponding to the plurality of reference signal port indexes associated with the first codeword is a first value, the number of ports corresponding to the plurality of reference signal port indexes corresponding to a first CDM group or a first TD-OCC in the subset of the second port set is the first value, the first CDM group is one of a plurality of CDM groups corresponding to a plurality of ports in the subset of the second port set, or the first TD-OCC is one of a plurality of TD-OCCs corresponding to a plurality of ports in the subset of the second port set.
4. The method of claim 3, wherein the step of,
The ports corresponding to the plurality of reference signal port indexes associated with the first codeword are identical to the ports corresponding to the first CDM group or the first TD-OCC in the subset of the second port set.
5. The method according to any one of claim 3 or 4, wherein,
The plurality of codewords further comprises a second codeword, and ports corresponding to a plurality of reference signal port indexes associated with the second codeword belong to a subset of the first port set and the second port set or a subset of the second port set.
6. The method of claim 5, wherein the step of determining the position of the probe is performed,
The number of ports belonging to the subset of the second port set among the ports corresponding to the plurality of reference signal port indexes associated with the second codeword is a second value, the number of ports corresponding to the plurality of reference signal port indexes corresponding to a second CDM group or a second TD-OCC in the subset of the second port set is the second value, the second CDM group is one of the plurality of CDM groups corresponding to the plurality of ports in the subset of the second port set, or the second TD-OCC is one of the plurality of TD-OCCs corresponding to the plurality of ports in the subset of the second port set.
7. The method of claim 6, wherein the step of providing the first layer comprises,
The ports corresponding to the plurality of reference signal port indices associated with the second codeword are the same as the ports corresponding to the second CDM group or the second TD-OCC in the subset of the second port set.
8. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {8,9,3,10,11};
The plurality of reference signal port indexes associated with the first codeword are {8,9}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {8,9}, and the reference signal port indexes {8,9} correspond to the first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,10,11}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {10,11}, and the reference signal port index {3,10,11} corresponds to the second CDM group.
9. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {1,8,9,3,10,11};
a plurality of reference signal port indices {1,8,9} associated with the first codeword, the first value being 2, the reference signal port indices {8,9} corresponding to a first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,10,11}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {10,11}, and the reference signal port index {3,10,11} corresponds to the second CDM group.
10. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {8,9,5,12,13};
A plurality of reference signal port indexes {8,9} associated with the first codeword, the first value being 2, ports included in a subset of the second port set having port indexes {8,9}, the reference signal port indexes {8,9} corresponding to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {5,12,13}, the second value is 2, the ports included in the subset of the second port set are {12,13}, the reference signal port indexes {5,12,13} are corresponding to the second TD-OCC.
11. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {1,8,9,5,12,13};
A plurality of reference signal port indexes {1,8,9} associated with the first codeword, the first value being 2, ports included in the subset of the second port set corresponding to port indexes {8,9}, the reference signal port indexes {8,9} corresponding to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {5,12,13}, the second value is 2, the ports included in the subset of the second port set are {12,13}, the reference signal port indexes {5,12,13} are corresponding to the second TD-OCC.
12. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {12,13,3,14,15};
The plurality of reference signal port indexes associated with the first codeword are {12,13}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to the first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,14,15}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {14,15}, and the reference signal port index {3,14,15} corresponds to the second CDM group.
13. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {1,12,13,3,14,15};
The plurality of reference signal port indexes associated with the first codeword are {1,12,13}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to the first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,14,15}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {14,15}, and the reference signal port index {3,14,15} corresponds to the second CDM group.
14. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {12,13,7,18,19};
A plurality of reference signal port indexes {12,13} associated with the first codeword, the first value being 2, ports included in a subset of the second port set having port indexes {12,13}, the reference signal port indexes {12,13} corresponding to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {7,18,19}, the second value is 2, the ports included in the subset of the second port set are {18,19}, the reference signal port indexes {7,18,19} are corresponding to the second TD-OCC.
15. The method according to any one of claims 5 to 7, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {1,12,13,7,18,19};
A plurality of reference signal port indexes {1,12,13} associated with the first codeword, wherein the first value is 2, port indexes corresponding to ports included in a subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {7,18,19}, the second value is 2, the ports included in the subset of the second port set are {18,19}, the reference signal port indexes {7,18,19} are corresponding to the second TD-OCC.
16. The method of any of claims 1-15, wherein the number of reference signal port indices associated with the first codeword does not contain 0 when the number of reference signal port indices associated with the first codeword is less than 4.
17. A method of indicating a reference signal port, comprising:
The method comprises the steps that a receiving end device receives first indication information from a transmitting end device, wherein the first indication information indicates a first index, the first index corresponds to a plurality of reference signal port indexes, the plurality of reference signal port indexes are associated with a plurality of code words, the plurality of reference signal port indexes associated with a first code word in the plurality of code words correspond to the same Code Division Multiplexing (CDM) group, or the plurality of reference signal port indexes associated with the first code word correspond to the same time domain orthogonal mask (TD-OCC), and the first code word is one of the plurality of code words;
the receiving end device transmits reference signals with the transmitting end device based on the plurality of reference signal ports.
18. The method of claim 17, wherein the step of determining the position of the probe is performed,
The ports corresponding to the plurality of reference signal port indexes associated with the first code word belong to a subset of a second port set and a first port set, or the ports corresponding to the plurality of reference signal port indexes associated with the first code word belong to a subset of the second port set, two long-wavelength frequency domain mask sequences corresponding to any two ports in the first port set are mutually orthogonal, four long-wavelength frequency domain mask sequences corresponding to any two ports in the second port set are mutually orthogonal, the two long-wavelength frequency domain mask sequences comprise frequency domain mask sequences corresponding to 2 continuous subcarriers in one CDM group, the four long-wavelength frequency domain mask sequences comprise frequency domain mask sequences corresponding to 4 continuous subcarriers in one CDM group, and the frequency domain mask sequence corresponding to any one port in the subset of the second port set is different from the frequency domain mask sequence corresponding to any one port in the first port set.
19. The method of claim 18, wherein the step of providing the first information comprises,
The number of ports belonging to a subset of the second port set among the ports corresponding to the plurality of reference signal port indexes associated with the first codeword is a first value, the number of ports corresponding to the plurality of reference signal port indexes corresponding to a first CDM group or a first TD-OCC in the subset of the second port set is the first value, the first CDM group is one of a plurality of CDM groups corresponding to a plurality of ports in the subset of the second port set, or the first TD-OCC is one of a plurality of TD-OCCs corresponding to a plurality of ports in the subset of the second port set.
20. The method of claim 19, wherein the step of determining the position of the probe comprises,
The ports corresponding to the plurality of reference signal port indexes associated with the first codeword are identical to the ports corresponding to the first CDM group or the first TD-OCC in the subset of the second port set.
21. The method according to any one of claim 19 or 20, wherein,
The plurality of codewords further comprises a second codeword, and ports corresponding to a plurality of reference signal port indexes associated with the second codeword belong to a subset of the first port set and the second port set or a subset of the second port set.
22. The method of claim 21, wherein the step of determining the position of the probe is performed,
The number of ports belonging to the subset of the second port set among the ports corresponding to the plurality of reference signal port indexes associated with the second codeword is a second value, the number of ports corresponding to the plurality of reference signal port indexes corresponding to a second CDM group or a second TD-OCC in the subset of the second port set is the second value, the second CDM group is one of the plurality of CDM groups corresponding to the plurality of ports in the subset of the second port set, or the second TD-OCC is one of the plurality of TD-OCCs corresponding to the plurality of ports in the subset of the second port set.
23. The method of claim 22, wherein the step of determining the position of the probe is performed,
The ports corresponding to the plurality of reference signal port indices associated with the second codeword are the same as the ports corresponding to the second CDM group or the second TD-OCC in the subset of the second port set.
24. The method according to any one of claims 21 to 23, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {8,9,3,10,11};
The plurality of reference signal port indexes associated with the first codeword are {8,9}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {8,9}, and the reference signal port indexes {8,9} correspond to the first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,10,11}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {10,11}, and the reference signal port index {3,10,11} corresponds to the second CDM group.
25. The method according to any one of claims 21 to 24, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {1,8,9,3,10,11};
a plurality of reference signal port indices {1,8,9} associated with the first codeword, the first value being 2, the reference signal port indices {8,9} corresponding to a first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,10,11}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {10,11}, and the reference signal port index {3,10,11} corresponds to the second CDM group.
26. The method according to any one of claims 21 to 25, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {8,9,5,12,13};
A plurality of reference signal port indexes {8,9} associated with the first codeword, the first value being 2, ports included in a subset of the second port set having port indexes {8,9}, the reference signal port indexes {8,9} corresponding to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {5,12,13}, the second value is 2, the ports included in the subset of the second port set are {12,13}, the reference signal port indexes {5,12,13} are corresponding to the second TD-OCC.
27. The method according to any one of claims 21 to 25, wherein,
The type of the reference signal is a first type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {1,8,9,5,12,13};
A plurality of reference signal port indexes {1,8,9} associated with the first codeword, the first value being 2, ports included in the subset of the second port set corresponding to port indexes {8,9}, the reference signal port indexes {8,9} corresponding to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {5,12,13}, the second value is 2, the ports included in the subset of the second port set are {12,13}, the reference signal port indexes {5,12,13} are corresponding to the second TD-OCC.
28. The method according to any one of claims 21 to 25, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {12,13,3,14,15};
The plurality of reference signal port indexes associated with the first codeword are {12,13}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to the first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,14,15}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {14,15}, and the reference signal port index {3,14,15} corresponds to the second CDM group.
29. The method according to any one of claims 21 to 25, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 1, the indexes of the plurality of reference signal ports corresponding to the first index are {1,12,13,3,14,15};
The plurality of reference signal port indexes associated with the first codeword are {1,12,13}, the first value is 2, the port indexes corresponding to the ports included in the subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to the first CDM group;
The plurality of reference signal port indices associated with the second codeword is {3,14,15}, the second value is 2, the subset of the second set of ports includes ports having port indices corresponding to {14,15}, and the reference signal port index {3,14,15} corresponds to the second CDM group.
30. The method according to any one of claims 21 to 25, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {12,13,7,18,19};
A plurality of reference signal port indexes {12,13} associated with the first codeword, the first value being 2, ports included in a subset of the second port set having port indexes {12,13}, the reference signal port indexes {12,13} corresponding to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {7,18,19}, the second value is 2, the ports included in the subset of the second port set are {18,19}, the reference signal port indexes {7,18,19} are corresponding to the second TD-OCC.
31. The method according to any one of claims 21 to 25, wherein,
The type of the reference signal is a second type, and when the maximum length of the reference signal is 2, the indexes of the plurality of reference signal ports corresponding to the first index are {1,12,13,7,18,19};
A plurality of reference signal port indexes {1,12,13} associated with the first codeword, wherein the first value is 2, port indexes corresponding to ports included in a subset of the second port set are {12,13}, and the reference signal port indexes {12,13} correspond to a first TD-OCC;
The plurality of reference signal port indexes associated with the second codeword are {7,18,19}, the second value is 2, the ports included in the subset of the second port set are {18,19}, the reference signal port indexes {7,18,19} are corresponding to the second TD-OCC.
32. The method of any of claims 17 to 31, wherein the number of reference signal port indices associated with the first codeword does not contain 0 when the number of reference signal port indices associated with the first codeword is less than 4.
33. A network device, comprising:
A unit or module comprising means for performing the method of any one of claims 1 to 16.
34. A terminal device, comprising:
A unit or module comprising means for performing the method of any one of claims 17 to 32.
35. A communication device, comprising:
A processor coupled to a memory for storing a program or instructions that, when executed by the processor, cause the apparatus to perform the method of any one of claims 1 to 16 or to perform the method of any one of claims 17 to 32.
36. A readable storage medium having stored thereon a computer program or instructions, which when executed, cause a computer to perform the method of any of claims 1 to 16, or 17 to 32.
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