CN101018220B - Implementation method and device for avoiding the interference between the cells - Google Patents
Implementation method and device for avoiding the interference between the cells Download PDFInfo
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Abstract
The related method preventing subzone interference comprises: allocating corresponding frequency resource for subzone edge users applying interference coordination and interference elimination respectively, exactly, the frequency resource can be allocated in advance, or allocated when system business loading changes and satisfies a certain condition; then, adjusting the frequency resource for eliminating and coordinating interference. This invention makes full of two ways for avoiding interference, adds system flexibility, and supports wide business request.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a technology for eliminating inter-cell interference.
Background
Currently, the OFDM (orthogonal frequency division multiplexing) technology based on multiple carriers in wireless communication systems is receiving more and more attention from the industry. The basic idea of the OFDM technology is to divide the time-frequency resources of a wireless communication system into a plurality of orthogonal narrow-band sub-channels in the frequency domain, and high-speed data streams are transmitted in parallel on each sub-channel through serial-to-parallel conversion. Due to the narrow-band characteristic of the sub-channels, the influence of multipath can be overcome, and the orthogonality among the sub-channels is kept, so that the interference among users in a cell is ensured to be small.
The OFDM technology has the advantages that signals of users in a cell are ensured to be orthogonal, and interference among the users in the cell is avoided. However, there is still interference between cells of OFDM technology, i.e. for users at the cell border, they may still be interfered by signals transmitted by neighbouring cells.
In order to solve the inter-cell Interference, two solutions, namely an implementation scheme of Interference coordination (Co-coordination) and an implementation scheme of Interference Cancellation (Interference Cancellation), are proposed to avoid the inter-cell Interference.
The implementation of the two schemes will be explained separately below.
(1) Implementation scheme of interference coordination
In the scheme, the frequency resources are divided, and different frequency resources are allocated to users at the cell boundary of different cells, so that the interference among the users at the cell boundary is less. The frequency for the border user preferentially allocated to each cell is referred to as the primary frequency of the cell, and the other frequencies of the cell are referred to as secondary frequencies.
In the interference coordination scheme, boundary users of adjacent cells need to use different main frequencies to avoid inter-cell interference, so that a frequency reuse factor is larger than 1, secondary frequencies can be allocated to cell center users for use, and the frequency reuse factor is 1. However, in this method, for a certain cell, the number of usable subcarriers of the cell boundary users is limited, so the peak rate and throughput of the cell boundary users are limited, and for some specific cases, the requirement of communication cannot be met due to the limitation of frequency resources, for example, when the number of users at the boundary of adjacent cells is large or there is a high peak rate service requirement at the boundary of cells, the limited frequency resources allocated to the cell boundary users cannot meet the corresponding requirement.
(2) Implementation scheme of interference elimination
The method comprises the following steps: when users occupying the same frequency resources in adjacent cells interfere with each other, each user firstly demodulates and decodes the interference signal, and separates and removes the recovered interference signal from the received signal, so as to improve the accuracy of demodulation and decoding of the required signal.
In the process of performing interference detection separation, a receiving user needs to know the signal configuration of an interfering user from an adjacent cell, including a modulation coding scheme, an FEC (forward error correction) scheme, a coding rate, and the like, and these information all need an extra large amount of signaling to notify the corresponding user, which inevitably increases the load and complexity of the system.
In view of the advantages and disadvantages of the above two implementations for avoiding inter-cell interference, an implementation method for avoiding inter-cell interference is proposed, which combines an implementation scheme for interference coordination with an implementation scheme for interference cancellation. First, all users are divided into cell center users and cell boundary users, as shown in fig. 1: the part of the grey hexagonal area in the figure can use all frequency resources, and the frequency reuse factor is 1; the part marked by bars, dots and blanks in the figure represents the method that the cell boundary users adopt the interference coordination frequency planning, and the frequency reuse factor is larger than 1.
In addition, the circle-shaped gray area in fig. 1 indicates that the cell boundary users use the interference detection and separation method, and occupy all the subcarriers to make the frequency reuse factor one. These cell boundary users are interference cancelled using the same-located same-size frequency resource block (Chunk), which is defined as several subcarriers that are consecutive in frequency for several symbols consecutive in time.
The implementation method combining the two schemes has the advantages that the interference of the adjacent cells is avoided or reduced to the minimum by frequency division, the SIR (signal to interference ratio) of the cell boundary users is effectively improved, and the implementation complexity is low.
However, in the above technical solution, a detailed resource allocation method is not designed according to the specific system load condition of each cell, and if the adjacent cells with different load conditions adopt the same resource allocation manner and proportion, the utilization of the limited physical resources is not reasonably arranged, and the throughput of the system is also limited.
In addition, the above technical solution does not provide a specific relationship between a physical resource block and a coding block and a resource block for performing interference detection and cancellation, if it is assumed that a coding block with the same size as Chunk is mapped to perform coding, so that "dual user detection" or "multi user detection" can be performed on chunks with the same position and the same size to recover and separate interference signals, if the size of the coding block is mapped to a physical resource that is not a Chunk size, for example, 2 times the Chunk size, and if interference cancellation is performed by taking Chunk as a unit, when performing demodulation and decoding, the interfered Chunk only includes a part of interference blocks of the interference blocks, so that the interference signals cannot be correctly decoded and detected, that is, the part of interference signals cannot be recovered and removed.
In summary, the above prior art implementation still has some problems, such that the interference which may occur in the wireless communication system cannot be effectively avoided.
Disclosure of Invention
The invention aims to provide a method and a device for avoiding interference among cells, so that the complementary advantages can be effectively realized between an interference coordination implementation scheme and an interference elimination implementation scheme, and the interference possibly occurring in a wireless communication system can be effectively avoided.
The purpose of the invention is realized by the following technical scheme:
the invention provides a method for avoiding interference among cells, which comprises the following steps:
allocating corresponding frequency resources as frequency resources for interference elimination and interference coordination occupation for cell boundary users using interference coordination and cell boundary users using interference elimination, and dynamically adjusting the frequency resources for interference elimination and interference coordination occupation;
wherein, the allocating corresponding frequency resources as the frequency resources occupied by interference cancellation and interference coordination for the cell boundary users using interference coordination and interference cancellation respectively specifically includes:
allocating a part of all available frequency resources to cell boundary users using interference cancellation as frequency resources occupied for interference cancellation, wherein the frequency resources are shared by adjacent cell users;
dividing the rest available frequency resources into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to a cell boundary user for interference coordination to serve as a frequency resource occupied by the interference coordination, and the secondary frequency is allocated to a cell center user;
or, the allocating corresponding frequency resources as the frequency resources occupied by interference cancellation and interference coordination respectively for the cell boundary users using interference coordination and the cell boundary users using interference cancellation specifically includes:
dividing all available frequency resources into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to a cell boundary user as a frequency resource occupied by interference coordination, and the secondary frequency is allocated to a cell center user;
when the cell boundary users reach a preset number value or the peak rate requirement of the cell boundary reaches a preset value, dividing a part of frequency resources occupied by interference elimination from the main frequency and using the frequency resources together with the adjacent cells; the dynamically adjusting frequency resources occupied for interference cancellation and interference coordination specifically includes: and dynamically adjusting the frequency resources occupied by the interference detection and elimination and the interference coordination.
The method comprises the following steps:
the interference cancellation resource block for interference cancellation, which comprises a group of consecutive subcarriers, comprises at least one complete coding block and consists of integer multiples of consecutive physical resource blocks at the same position.
The method comprises the following steps:
when the original information transmission block of a certain user is larger than a preset value, the original information transmission block of the user is divided into a plurality of coding blocks, and the size of each coding block corresponds to the interference elimination resource block.
The method comprises the following steps:
the adjustment of the frequency resources occupied by the interference coordination is realized by distinguishing the resources occupied by the users at the boundary of different cells through different time-frequency patterns.
The method comprises the following steps:
the adjustment of the frequency resources occupied for interference detection and elimination is realized by distinguishing different time-frequency patterns from the frequency resources used for interference coordination.
The method comprises the following steps:
the resource blocks occupied by the interference detection and elimination adopt different modulation and coding modes or the same modulation and coding mode.
The method further comprises the following steps: when resource blocks used for interference cancellation in adjacent cells use different modulation and coding schemes, configuration information of an interfering user needs to be notified to an interfered user.
In the invention, the process of informing the configuration information of the interfering user to the interfered user comprises the following steps:
the interfering cell base station informs the interfered cell base station of the configuration information of the interfering user, and then the interfered cell base station informs the interfered user of the information;
or,
and the interfered cell base station informs the identity information of the interfered user of the interfered cell base station, and then informs the configuration information of the corresponding interfered user of the interfered user according to the identity information.
The frequency resource used for interference coordination occupation is set to be capable of being adjusted between adjacent cells according to different load demand conditions of the adjacent cells.
The dynamic adjustment specifically includes:
in a cell, frequency resources which are allocated in the cell and used for interference elimination and interference coordination occupation are adjusted according to the number of users at the cell boundary or the service requirement condition of the users at the cell boundary.
The invention also provides a device for avoiding interference among cells, which comprises:
a frequency resource allocation module: the method comprises the steps that corresponding frequency resources are determined for cell boundary users for interference coordination and interference elimination respectively and serve as the frequency resources occupied by the interference elimination and the interference coordination;
a frequency adjustment module: the frequency resource used for interference elimination and interference coordination occupation is dynamically adjusted; the frequency resource allocation module specifically includes:
an interference cancellation frequency resource allocation module: the method comprises the steps of allocating a part of frequency resources of a cell to cell boundary users for interference elimination as frequency resources occupied for the interference elimination, wherein the frequency resources are shared with adjacent cell users;
an interference coordination frequency resource allocation module: the system comprises a frequency resource management module, a frequency resource allocation module and a frequency resource allocation module, wherein the frequency resource management module is used for dividing another part of frequency resources of a cell into a main frequency and a secondary frequency, the main frequency is preferentially allocated to a cell boundary user used for interference coordination as a frequency resource occupied by interference coordination, and the secondary frequency is allocated to a cell center user;
or, the frequency resource allocation module specifically includes:
an interference coordination frequency resource allocation module: dividing frequency resources of a cell into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to cell boundary users as the frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;
a judgment processing module: the device comprises a frequency resource allocation module for triggering interference elimination when the number of users at the boundary of adjacent cells reaches a preset value or the peak rate requirement at the boundary of the cells reaches the preset value is judged;
an interference cancellation frequency resource allocation module: and the interference coordination frequency resource allocation module divides a part of the main frequency into frequency resources occupied by interference elimination and uses the frequency resources together with the adjacent cells.
The device further comprises:
an information processing module: when the original information transmission block of a certain user is larger than a preset value, the original information transmission block of the user is divided into a plurality of CBs, and the size of each CB corresponds to the ICRB.
In the present invention, when the resource blocks used for interference cancellation in the adjacent cells use different modulation and coding schemes, the apparatus further includes:
an interference information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing configuration information of an interference user to an interfered cell base station;
the first information sending module: and the base station is arranged in the interfered cell base station and is used for informing the configuration information of the interfering user to the interfered user.
In the present invention, when the resource blocks used for interference cancellation in the adjacent cells use different modulation and coding schemes, the apparatus further includes:
identity information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing the identity information of an interference user to the interfered cell base station;
a second information sending module: and the base station is arranged in the interfered cell base station and used for notifying the configuration information of the corresponding interfering user to the interfered user according to the identity information of the interfering user.
It can be seen from the above technical solutions provided by the present invention that the present invention provides a more flexible implementation solution combining interference coordination interference avoidance and interference cancellation, and provides a relationship between specific physical resource blocks and coding blocks and resource blocks for interference detection cancellation. Therefore, the implementation of the present invention makes it possible to simultaneously utilize two implementation methods for avoiding inter-cell interference in a wireless communication system: one is interference coordination to avoid inter-cell interference, and the other is interference cancellation; thereby realizing respective advantage complementation between the two methods to reduce respective limitations. Meanwhile, the invention also increases the flexibility of the system and supports various service requirements by dynamically adjusting the frequency resources occupied by interference elimination and interference coordination.
In addition, the invention is not limited by the size of the user data transmission block so as to support various service requirements, interference elimination can be carried out on a larger data transmission block service, and interference avoidance is carried out on a smaller data transmission block service by adopting interference coordination.
Drawings
Fig. 1 is a schematic diagram of a system combining interference cancellation and interference coordination in the prior art;
fig. 2 is a schematic diagram of an implementation of a system combining interference cancellation and interference coordination provided in the present invention;
fig. 3 is a schematic diagram of dynamically adjusting frequency resources occupied by interference cancellation and interference coordination in the present invention;
fig. 4 is a schematic diagram of a resource allocation method based on interference coordination;
fig. 5 is a schematic diagram of a frequency resource adjustment process for interference cancellation;
fig. 6 is a diagram of an interference cancellation block including a complete coding block;
fig. 7 is a diagram of an interference cancellation block including a segmented complete coding block;
fig. 8 is a schematic view of the apparatus of the present invention.
Detailed Description
The invention is realized on the basis of two interference avoidance implementation schemes of interference coordination and interference elimination. In the implementation process, the frequency resources occupied by interference coordination and interference elimination are dynamically adjusted, so that different system environments and various service requirements are effectively supported.
In the scheme combining interference coordination and interference elimination provided by the invention, dynamic adjustment of frequency resources occupied by the interference coordination and the interference elimination can be realized by adopting different frequency resource allocation modes; the corresponding frequency resources can be allocated in advance, and the allocation of the frequency resources occupied by interference elimination and interference coordination can be completed when the service load changes and meets the preset conditions.
For the understanding of the present invention, the following two specific dynamic frequency resource allocation manners are used as examples to describe the specific implementation manner of the present invention. Of course, the implementation of the present invention is not limited to the following two specific resource allocation manners.
(1) First resource allocation mode
In this way, a part of all available frequency resources is specially divided and allocated to cell boundary users for interference cancellation, and the part of frequency resources can be shared by adjacent cell users; then, dividing the rest cell frequency resources into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to a cell boundary user for interference coordination, and the secondary frequency is allocated to a cell center user; after the resource allocation is completed, the frequency resources occupied by the interference elimination and the interference coordination can be dynamically adjusted according to different system load conditions.
Referring to fig. 2, first, a part of frequency resources is allocated specially for interference detection and cancellation of cell boundary users, and a black circle portion in fig. 2 is a frequency resource for interference detection and cancellation of cell boundary users; then, the interference coordination resource allocation is performed, that is, other parts marked with bars, dots and spaces in fig. 2 represent cell boundary users to avoid interference by adopting interference coordination frequency planning, and an interference detection and cancellation technique is not adopted, the middle part marked with gray hexagons is allocated to cell center users to use all frequency resources, and the frequency reuse factor is one.
At this time, the portion of the frequency resources allocated to the cell boundary users for interference cancellation may be semi-statically or dynamically adjusted, as shown in fig. 3, different cell base stations may allocate the frequency resources for interference cancellation to the cell boundary users for interference coordination or to the cell center users according to different system load requirements, for example:
when the system load at the cell boundary is small, as shown in fig. 3 where only the interference coordination portion exists, in this case, the frequency resources allocated for interference detection and cancellation can be reallocated to the cell center users, and the interference between the cell boundaries can be avoided only by a relatively simple interference coordination technique. Moreover, when a part of resources are allocated to the cell center user, since the distance from the adjacent cell is far, the signal power attenuation is large, and the interference caused to the adjacent cell is small, the interference detection and elimination are not needed any more.
When the load at the boundary of a certain cell is large or there is a high peak rate requirement, as shown in fig. 3 where only the interference cancellation part exists, there is no frequency resource for interference coordination, and all cell boundary users share as many frequency resources as possible to meet the system requirement.
(2) Second resource allocation method
Another resource allocation approach is based on interference coordination.
In this approach, the frequency resources in a cell are first divided into primary and secondary frequencies according to a frequency coordination scheme: preferentially distributing the main frequency to boundary users of each cell, wherein the boundary users of adjacent cells use different main frequencies to avoid interference among the cells; the secondary frequency is allocated to the user in the center of the cell. Then, when a large number of users are present at a certain cell boundary or a certain adjacent cell boundary or there is a high peak rate requirement, the method for interference coordination cannot meet the existing system requirement, and therefore, the main frequency of the cell or some adjacent cells adjacent to the cell needs to be divided into a part to be shared with the adjacent cells for interference detection and cancellation. Meanwhile, there is also a need to dynamically adjust the occupied frequency resources for interference detection and cancellation and interference coordination in the communication system.
For example, as shown in fig. 4, when there is adjacent cell frequency contention, and there are many boundary users of cell 1 and cell 2 (i.e. a predetermined number of users is reached) or both boundary users require a high peak rate (i.e. the peak rate requirement reaches a predetermined value), the frequency resources used by the two adjacent cells for interference coordination may be divided into a part through negotiation between the two cells, and the part of the frequency resources is used as the frequency resources that can be used by both boundary users of cell 1 and cell 2. Meanwhile, the interference is detected and separated out by utilizing the part of frequency and adopting an interference elimination technology, and the corresponding frequency resource for interference elimination can be adjusted according to different system load conditions.
In addition, in the scheme combining interference coordination and interference cancellation provided by the present invention, the main frequency resource allocated to a certain cell for interference coordination, that is, the frequency resource preferentially allocated to the cell boundary, may also be semi-statically or dynamically adjusted according to the system load conditions of the cell and the adjacent cell boundary that are different from each other, for example, when there is a sudden large throughput demand on a certain cell boundary, if the load on the adjacent cell boundary is small, a part of the frequency resources occupied by the adjacent cell boundary users is reallocated to the cell users through negotiation between the cell base station and the adjacent cell base station, and at this time, the frequency reuse factor of each cell may not be an integer.
The frequency resources used for interference coordination can be divided into frequency resources occupied by users at different cell boundaries through different time-frequency patterns, and the frequency resources used for interference cancellation can be distinguished from the frequency resources used for interference coordination through different time-frequency patterns. For example, as shown in fig. 5, the time-frequency patterns of different patterns represent time-frequency resources used by different neighboring cells, and the blank, gray, and bar portions represent time-frequency resources used for interference coordination respectively occupied by 3 neighboring cells 1, 2, and 3. When there are many users (reaching a predetermined user number value) or high peak rate requirement (the peak rate requirement reaching a predetermined value) at the cell boundary of both cell 1 and cell 2, and there is no load at the cell boundary of cell 3, the time-frequency resources originally allocated to cell 3 for interference coordination may be reallocated to the boundary users of cell 1 and cell 2 for use in interference cancellation.
In the invention, in order to realize the scheme of combining the interference coordination technology and the interference elimination, the relationship between a specific physical resource block and a coding block and between the resource blocks for detecting and eliminating the interference is redefined, so as to ensure that the interference signals at corresponding positions can be correctly detected and separated in the interference elimination process. The specific definition is as follows: an ICRB (Interference cancellation Resource Block) is composed of consecutive integer number of Physical Resource blocks PRB (Physical Resource blocks), which can be determined by some suitable typical system load and guarantees sufficient channel coding gain, where PRB is the Chunk. The ICRB contains at least one complete CB (Code Block), and the signal contained in the CB is a superposition of an interfering signal and an interfered signal. When interference detection cancellation is performed, the interference must be correctly detected and separated out on the same position and same size of the ICRB.
When the CB size for the interference cancellation user is mapped to the physical resource and can be accommodated in one ICRB, that is, the interference cancellation ICRB includes complete CBs of some users, for example, as shown in fig. 6, when the adjacent cells a and B are to perform interference detection cancellation, the employed ICRB includes a complete CB of some users, the CB is mapped to the physical resource and includes several PRBs, in fig. 6, each ICRB is composed of 4 consecutive PRBs, the 4 PRBs include a complete coding block of two boundary users of the cell a and the cell B, and the 6 CBs of 6 users correspond to 6 ICRBs. Therefore, when the interference is eliminated, the interference signal can be recovered and separated only by carrying out simple 'dual-user detection'.
When the original information transport block of a certain user is large, for example, when the CB according to a certain coding gain is mapped to a resource block which is larger than a specific resource block on which interference cancellation can be performed on a physical resource, the original information transport block of the user can be divided into a plurality of CBs to ensure that the size of each CB corresponds to the ICRB. For example, as shown in fig. 7, user 3 and user 4 of cell a and user 2 of cell B occupy two consecutive ICRBs, containing two complete CBs, while user 1 of cell B occupies 3 non-consecutive ICRBs, each containing one complete CB. At this time, the number of PRBs contained per ICRB is still guaranteed to be suitable for typical system load and sufficient coding gain. So in this case, similar "dual user detection" can be done to complete interference cancellation even if the user's original information transport block for interference detection cancellation is large.
The resource blocks for interference detection cancellation may employ different modulation and coding modes, e.g., different modulation modes, FEC modes, and coding gains to adapt to different channel conditions; alternatively, the same modulation coding scheme, such as QPSK (quadrature phase shift keying) and Turbo (parallel concatenated interleaved convolutional code) coding, may be used, which greatly simplifies the operation of detecting the interference signal by the user.
In addition, the interference cancellation method using interference detection separation needs a receiving user to acquire configuration information from an interfering user in an adjacent cell, that is, some configuration information of an interference signal, including a modulation coding mode, an FEC mode, a coding rate, and the like, so that the interference signal can be recovered and separated. Therefore, in the communication system, some extra methods or signaling are needed for the notification of the configuration information of the interfering users. The method for notifying the configuration information of the interfering user adopted in the invention can be realized by adopting the following two methods, respectively:
1. the interfering cell base station informs the interfered cell base station of the configuration information of the interfering user, and then the interfered cell base station informs the interfered user of the information.
2. The interfering cell base station informs the ID (user identity) of the interfering user of the interfered cell base station, the interfered cell base station informs the interfered user of corresponding information, and the interfered user receives the configuration information of the user identity sent by the interfering cell base station.
When the resource blocks used for interference cancellation in the adjacent cells use the same modulation and coding scheme, the interfered user already knows the configuration information of the interfering user in advance, so that no extra signaling is needed for notifying the interference signal information.
The invention also provides a device for avoiding interference between cells, and the specific implementation of the device is shown in fig. 8, and specifically comprises the following modules:
(1) frequency resource allocation module
The method comprises the steps that corresponding frequency resources are determined for cell boundary users for interference coordination and interference elimination respectively and serve as the frequency resources occupied by the interference elimination and the interference coordination;
the module can be realized by adopting the following two specific structures, respectively:
in a first implementation structure, the frequency resource allocation module specifically includes:
an interference cancellation frequency resource allocation module: the method comprises the steps of allocating a part of frequency resources of a cell to cell boundary users for interference elimination as frequency resources occupied for interference elimination, wherein the frequency resources are shared with adjacent cell users;
an interference coordination frequency resource allocation module: the method is used for dividing another part of frequency resources of the cell into a primary frequency and a secondary frequency, wherein the primary frequency is preferentially allocated to the frequency resources occupied by interference coordination cell boundary users, and the secondary frequency is allocated to cell center users.
In a second implementation structure, the frequency resource allocation module specifically includes:
an interference coordination frequency resource allocation module: dividing frequency resources of a cell into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to cell boundary users as the frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;
a judgment processing module: the device comprises a frequency resource allocation module for triggering interference elimination when the situation that the user at the boundary of the adjacent cell reaches a preset value or the peak rate requirement at the boundary of the cell reaches the preset value is judged;
an interference cancellation frequency resource allocation module: and the interference coordination frequency resource allocation module divides a part of the main frequency into frequency resources occupied by interference elimination and uses the frequency resources together with the adjacent cells.
(2) Frequency adjusting module
For dynamically adjusting the frequency resources occupied for interference cancellation and interference coordination.
The device further comprises:
an information processing module: when the original information transmission block of a certain cell boundary user for interference elimination is larger than a preset value, the original information transmission block of the user is divided into a plurality of CBs, and the size of each CB corresponds to the ICRB.
In addition, when resource blocks used for interference cancellation in adjacent cells use different modulation and coding schemes, configuration information of interfering users needs to be notified to interfered users in the apparatus, for this reason, as shown in fig. 8, corresponding modules need to be additionally provided in the apparatus, which can be specifically implemented by the following two specific structures:
structure 1 is a module added to the apparatus as follows:
an interference information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing configuration information of an interference user to an interfered cell base station;
the first information sending module: and the base station is arranged in the interfered cell base station and is used for informing the configuration information of the interfering user to the interfered user.
Structure 2 is the module added in the device as follows:
identity information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing the identity information of an interference user to the interfered cell base station;
a second information sending module: and the base station is arranged in the interfered cell base station and used for notifying the configuration information of the corresponding interfering user to the interfered user according to the identity information of the interfering user.
In summary, the implementation of the present invention enables two implementation methods for avoiding inter-cell interference to be simultaneously utilized in a wireless communication system: one is interference coordination to avoid inter-cell interference, and the other is interference cancellation; thereby realizing respective advantage complementation between the two methods to reduce respective limitations. Meanwhile, the invention also increases the flexibility of the system and supports various service requirements by dynamically adjusting the frequency resources occupied by interference elimination and interference coordination.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (14)
1. An implementation method for avoiding interference between cells, comprising:
allocating corresponding frequency resources as frequency resources for interference elimination and interference coordination occupation for cell boundary users using interference coordination and cell boundary users using interference elimination, and dynamically adjusting the frequency resources for interference elimination and interference coordination occupation;
wherein, the allocating corresponding frequency resources as the frequency resources occupied by interference cancellation and interference coordination for the cell boundary users using interference coordination and interference cancellation respectively specifically includes:
allocating a part of all available frequency resources to cell boundary users using interference cancellation as frequency resources occupied for interference cancellation, wherein the frequency resources are shared by adjacent cell users;
dividing the rest available frequency resources into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to a cell boundary user for interference coordination to serve as a frequency resource occupied by the interference coordination, and the secondary frequency is allocated to a cell center user;
or, the allocating corresponding frequency resources as the frequency resources occupied by interference cancellation and interference coordination respectively for the cell boundary users using interference coordination and the cell boundary users using interference cancellation specifically includes:
dividing all available frequency resources into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to a cell boundary user as a frequency resource occupied by interference coordination, and the secondary frequency is allocated to a cell center user;
when the cell boundary users reach a preset number value or the peak rate requirement of the cell boundary reaches a preset value, dividing a part of frequency resources occupied by interference elimination from the main frequency, and using the frequency resources together with the adjacent cells; the dynamic adjustment of the occupied frequency resources for interference cancellation and interference coordination includes: and dynamically adjusting the frequency resources occupied by the interference detection and elimination and the interference coordination.
2. The method of claim 1, wherein the method comprises:
the interference cancellation resource block for interference cancellation, which comprises a group of consecutive subcarriers, comprises at least one complete coding block and consists of integer multiples of consecutive physical resource blocks at the same position.
3. The method of claim 1, wherein the method comprises: when the original information transmission block of a certain user is larger than a preset value, the original information transmission block of the user is divided into a plurality of coding blocks, and the size of each coding block corresponds to the interference elimination resource block.
4. The method of claim 1, wherein the method comprises:
the adjustment of the frequency resources occupied for interference coordination is realized by distinguishing the resources occupied by different cell boundary users through different time-frequency patterns,
5. the method of claim 1, wherein the method comprises:
the adjustment of the frequency resources occupied for interference detection and elimination is realized by distinguishing different time-frequency patterns from the frequency resources used for interference coordination.
6. The method of claim 1, wherein the method comprises:
the resource blocks occupied by the interference detection and elimination adopt different modulation and coding modes or the same modulation and coding mode.
7. The method of claim 1, further comprising: when resource blocks used for interference cancellation in adjacent cells use different modulation and coding schemes, configuration information of an interfering user needs to be notified to an interfered user.
8. The method of claim 7, wherein notifying the interfered user of the configuration information of the interfering user comprises:
the interfering cell base station informs the interfered cell base station of the configuration information of the interfering user, and then the interfered cell base station informs the interfered user of the information;
or,
and the interfered cell base station informs the identity information of the interfered user of the interfered cell base station, and then informs the configuration information of the corresponding interfered user of the interfered user according to the identity information.
9. The method of claim 1, wherein the frequency resources occupied for interference coordination are configured to be adjusted between adjacent cells according to different load requirements of the adjacent cells.
10. The method according to claim 1, wherein the dynamic adjustment specifically comprises:
in a cell, frequency resources which are allocated in the cell and used for interference elimination and interference coordination occupation are adjusted according to the number of users at the cell boundary or the service requirement condition of the users at the cell boundary.
11. An apparatus for avoiding interference between cells, comprising:
a frequency resource allocation module: the method comprises the steps that corresponding frequency resources are determined for cell boundary users for interference coordination and interference elimination respectively and serve as the frequency resources occupied by the interference elimination and the interference coordination;
a frequency adjustment module: the frequency resource used for interference elimination and interference coordination occupation is dynamically adjusted;
the frequency resource allocation module specifically includes:
an interference cancellation frequency resource allocation module: the method comprises the steps of allocating a part of frequency resources of a cell to cell boundary users for interference elimination as frequency resources occupied for interference elimination, wherein the frequency resources are shared with adjacent cell users;
an interference coordination frequency resource allocation module: the system comprises a frequency resource management module, a frequency resource allocation module and a frequency resource allocation module, wherein the frequency resource management module is used for dividing another part of frequency resources of a cell into a main frequency and a secondary frequency, the main frequency is preferentially allocated to a cell boundary user used for interference coordination as a frequency resource occupied by interference coordination, and the secondary frequency is allocated to a cell center user;
or, the frequency resource allocation module specifically includes:
an interference coordination frequency resource allocation module: dividing frequency resources of a cell into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to cell boundary users as the frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;
a judgment processing module: the device comprises a frequency resource allocation module for triggering interference elimination when the situation that the user at the boundary of the adjacent cell reaches a preset value or the peak rate requirement at the boundary of the cell reaches the preset value is judged;
an interference cancellation frequency resource allocation module: and the interference coordination frequency resource allocation module divides a part of the main frequency into frequency resources occupied by interference elimination and uses the frequency resources together with the adjacent cells.
12. The apparatus of claim 11, further comprising:
an information processing module: the method is used for dividing the original information transmission block of a user into a plurality of coding blocks CB when the original information transmission block of the user is larger than a preset value, and enabling the size of each coding block CB to correspond to an interference elimination resource block ICRB.
13. The apparatus of claim 11, wherein when resource blocks used for interference cancellation in neighboring cells use different modulation and coding schemes, the apparatus further comprises:
an interference information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing configuration information of an interference user to an interfered cell base station;
the first information sending module: and the base station is arranged in the interfered cell base station and is used for informing the configuration information of the interfering user to the interfered user.
14. The apparatus of claim 11, wherein when resource blocks used for interference cancellation in neighboring cells use different modulation and coding schemes, the apparatus further comprises:
identity information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing the identity information of an interference user to the interfered cell base station;
a second information sending module: and the base station is arranged in the interfered cell base station and used for notifying the configuration information of the corresponding interfering user to the interfered user according to the identity information of the interfering user.
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