CN101425882A - Method for triggering relay computed HARQ downlink data feedback time delay - Google Patents
Method for triggering relay computed HARQ downlink data feedback time delay Download PDFInfo
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- CN101425882A CN101425882A CNA2007101667559A CN200710166755A CN101425882A CN 101425882 A CN101425882 A CN 101425882A CN A2007101667559 A CNA2007101667559 A CN A2007101667559A CN 200710166755 A CN200710166755 A CN 200710166755A CN 101425882 A CN101425882 A CN 101425882A
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Abstract
The invention relates to a method for triggering the feedback and the time delay of relay calculation HARQ downlink data in a multi-hop relay network, which is as follows: defining null data which does not occupy the data of null resources; and immediately calculating and repeating the time delay of corresponding data feedback while receiving the relay of the null data. The method utilizes the null data to actively trigger the relay calculation, and avoids evil consequences caused by that the relay does not know when to begin to calculate and repeat the corresponding feedback under the circumference of generating problems in the process of HARO sudden or channel data transmission.
Description
Technical field
The present invention relates to mix automatic request retransmission HARQ, be specifically related to trigger in a kind of multi-hop relay network the method for relaying computed HARQ downlink data delay of feedback.
Background technology
At present, on the basis of the air protocol IEEE802.16j of BWA (IEEE's 802.16 relayings) IEEE 802.16e, introduce relay station Relay Station, be called for short RS.
As shown in Figure 1, one or more RS is set between the base station (MR-BS, Multi-hop Relay Base Station) and terminal (MS, Mobile Stations) of supporting multi-hop relay.RS can enlarge system ovelay range and increase power system capacity by the burst between relaying MR-BS and the MS.For relay station RS, according to whether producing and send prefix and control messages, RS can be divided into transparent RS and nontransparent RS; According to the bitmap MAP message that whether produces allocated channel, nontransparent RS can be divided into centralized RS and distributed RS again.Centralized RS can do by myself and produces prefix and control messages, but channel resource allocation must be finished by MR-BS; That the present invention studies is centralized RS.
As shown in Figure 1, for the end-to-end HARQ of centralized RS, support the base station MR-BS of multi-hop relay to send preceding each RS that given of certain HARQ burst (also claiming the son burst) and distribute corresponding feedback channel to transmit ACK/NACK at RS (comprising RS1 and RS2).RS receives the burst that will transmit to begin to calculate at and begins to transmit feedback from downstream node for which frame, transmits the burst back and sends feedback according to result of calculation on corresponding interface-free resources.
In addition, as shown in Figure 2, when a RS inserts a plurality of MS, can set up a relaying tunnel tunnel between this access RS and the MR-BS.The protocol Data Unit PDU of a plurality of MS can form a tunneling data by MR-BS, transmits in a frame as the base unit of HARQ.The described tunneling data of regulation can be divided into two kinds of patterns, tunnel packet pattern Tunnel Packet Mode and tunnel burst mode Tunnel Burst Mode in the IEEE802.16j standard rough draft at present.In the group mode, be combined into a tunnel packet from the PDU of each MS.Tunnel packet has the packets headers (comprising the tunnel connection identifiers CID, tunnel connection identifier TCID and cyclic check code CRC) of oneself.In the tunnel burst mode, TCID provides in descending message bit pattern unit (DL MAP IE), so tunneling data can regard a burst of physical layer as, and this burst comprises the PDU of all MS in the tunnel.
Tunneling data HARQ can use chain to chain pattern.As shown in Figure 2, MR-BS is a tunnel links to RS3, and RS3 is an access link to MS.In the centralized scheduling relay system, two link inside can be end-to-end HARQ respectively.After tunneling data successfully arrives RS3, by inserting relay station RS3 the PDU that tunneling data splits into each MS is sent to different access link again.The feedback of MS can feed back to MR-BS after RS3 concentrates, also can feed back to MR-BS separately, can also not feed back to MR-BS, and its difference is the machine-processed different of access link retransfer scheduling.Among the present invention, the application scenarios of tunneling data all is a downlink transfer.
In the prior art, in case go wrong in HARQ burst or the tunneling data transmission course, RS just might not know when begin to calculate the moment of transmitting respective feedback.For example:
(1) in system shown in Figure 1, in downlink burst retransmitted, retransmitting burst can begin at the downstream node RS2 of RS1.Retransmit for this, RS1 and RS2 can not receive the burst of wanting transfer, therefore can not be triggered to begin to calculate the moment of transmitting corresponding downlink burst feedback.
(2) similar, in system shown in Figure 2, in downlink data retransmitted, tunneling data retransmitted and can begin at the downstream node RS2 of RS1.Retransmit for this, RS1 and RS2 can not receive the data of wanting transfer, therefore can not be triggered to begin to calculate the moment of transmitting corresponding downlink tunnel data feedback.
(3) in addition, in system shown in Figure 2, for the HARQ of access link, if need be reported to MR-BS from the feedback of MS.The burst transfer of MS is from RS3 at this moment, and RS1, RS2 and RS3 can not receive the burst of MS, and therefore can not be triggered begins to calculate the moment of the concentrated feedback of transmitting corresponding burst.
Based on above problem, need further consider that triggering RS in the multi-hop relay network calculates the solution of transmitting delay of feedback.
Summary of the invention
The technical issues that need to address of the present invention are how a kind of method that triggers relaying RS computed HARQ downlink data delay of feedback is provided, and can initiatively trigger RS and calculate the forwarding delay of feedback in the multi-hop relay network.
Above-mentioned technical problem of the present invention solves like this, and a kind of method that triggers relaying computed HARQ downlink data delay of feedback is provided, and is applied in the multi-hop relay network, may further comprise the steps:
1.1) defining empty data, these sky data are the data that do not take interface-free resources;
1.2) receive that the relaying of described empty data gets started the time delay of calculating forwarding corresponding data feedback.
According to method provided by the invention, described forwarding is that non-tunnel is transmitted, described empty data are empty bursts, feed back behind the n frame of relaying after receiving described empty burst, described calculating is n=H*p+ (H+1) * j, wherein: H is the jumping figure that relaying leaves link terminal, and p is the fixed delay frame number of relaying, and j is system definition and the HARQ feedback delay that provides in system broadcast message.
According to method provided by the invention, described forwarding is that the tunnel is transmitted, and described empty data are empty tunneling datas, feed back behind the m frame of relaying after receiving described empty tunneling data, described calculating is m=M*q+ (M+1) * k, and wherein: M is the jumping figure that relaying leaves termination point of a tunnel; Q is the fixed delay frame number of relaying for tunneling data; K is system definition and the HARQ feedback delay for tunnel burst that provides in system broadcast message.
According to method provided by the invention, described empty tunneling data is the empty tunnel burst of corresponding terminal MS, feed back behind the n frame of relaying after receiving described empty tunnel burst, described calculating is n=H*p+ (H+1) * j, wherein: H is the jumping figure that relaying leaves link terminal, p is the fixed delay frame number of relaying, and j is system definition and the HARQ feedback delay that provides in system broadcast message.
According to method provided by the invention, described empty tunneling data is to happen suddenly in the empty set, feed back behind the k frame after relaying happens suddenly in receiving described empty set, described calculating is k=H*p+ (H+1) * j+s, wherein: H is the jumping figure that relaying leaves link terminal, p is the fixed delay frame number of relaying, and j is system definition and the HARQ feedback delay that provides in system broadcast message, and s is a maximum delay of collecting all terminals feedbacks.
According to method provided by the invention, described empty data can by but be not restricted to by revising in the existing IEEE802.16j standard rough draft unit of the burst information in MAP message form and realize.
According to method provided by the invention, described modification is to utilize burst mode of reserved word definition and corresponding empty burst information unit.
According to method provided by the invention, described empty burst information unit comprises connection identifiers CID information or tunnel connection identifier TCID and feedback channel sign ACID information.
According to method provided by the invention, described modification is zero filling in relevant territory, described burst information unit can be except catching up with merging (Chase), also has incremental redundancy convolutional turbo (IR CTC), incremental redundancy convolution code (IR CC), MIMO are caught up with any in the empty time-code of merging (MIMO Chase), MIMO incremental redundancy (MIMO IR), MIMO incremental redundancy convolution code (MIMO IR CC) and MIMO (MIMO STC).
According to method provided by the invention, described relevant territory comprises message length and takies resource.
A kind of method that triggers relaying RS computed HARQ downlink data delay of feedback provided by the invention, utilize empty data owner movable contact to send out relaying computed HARQ downlink data delay of feedback, can avoid that RS does not know when begin to calculate the disastrous effect of transmitting respective feedback and may causing under the situation that goes wrong in HARQ burst or tunneling data transmission course.
Description of drawings
Fig. 1 is the schematic diagram of the wireless relay network configuration of the embodiment of the invention 1;
Fig. 2 is the schematic diagram of the wireless relay network configuration of the embodiment of the invention 2,3 and 4;
Fig. 3 is the schematic flow sheet that 1 one descending end-to-end HARQ access link of the embodiment of the invention retransmit feedback;
Fig. 4 is the schematic flow sheet that 2 one downlink tunnel HARQ of embodiment of the invention tunnel links retransmits feedback;
Fig. 5 is the schematic flow sheet of 3 one downlink tunnel HARQ of embodiment of the invention access link feedback;
Fig. 6 is the schematic flow sheet of 4 one downlink tunnel HARQ of embodiment of the invention access link feedback;
Fig. 7 is the burst mode schematic diagram that the present invention defines;
Fig. 8 is the following line space burst IE form schematic diagram that the present invention defines.
Embodiment
At first, inventive concept is described:
Empty data notification RS of the inventive method definition begins to calculate the time delay of transmitting this burst feedback.So-called empty data refer to the data that do not take interface-free resources.Such data only play a trigger action, receive that the RS of these sky data should get started the time delay of calculating this data feedback of forwarding.
In second step, specify key point of the present invention in two kinds of situation:
(1) the common HARQ of non-tunnel
For the common HARQ of non-tunnel, as shown in Figure 3, described empty data can be empty bursts.The RS that receives this empty burst should get started the time delay of calculating this burst feedback of forwarding.Empty burst can be revised burst information unit (IE) the form realization in the MAP message in the existing IEEE802.16j standard rough draft by (but being not limited to).
For the common HARQ of non-tunnel,, should feed back at (i+n) frame if RS receives the sky data at the i frame.Wherein n is determined by formula (1).
n＝H*p+(H+1)*j (1)
H is the jumping figure that RS leaves link terminal in the formula (1), and p is the fixed delay frame number of RS, and j is the HARQ feedback delay of system definition, provides in system broadcast message.
(2) tunnel links HARQ
Tunnel links HARQ for tunneling data, as shown in Figure 4, described empty data can be empty tunneling datas, and what its was represented may be an empty tunnel packet (happening suddenly in the empty set), also may be an empty tunnel burst, specifically according to the tunneling data pattern decision of retransmitting.The RS that receives this sky tunneling data should get started the time delay of calculating this tunneling data feedback of forwarding.Empty tunneling data can be revised MAP message corresponding information unit (IE) form realization in the existing IEEE802.16j standard rough draft by (but being not limited to).
For the tunnel links HARQ of tunneling data,, should feed back at (i+m) frame if RS receives the sky tunneling data at the i frame.Wherein m is determined by formula (2).
m＝M*q+(M+1)*k (2)
M is the jumping figure that RS leaves termination point of a tunnel in the formula (2); Q is the fixed delay frame number of RS for tunneling data; K is the HARQ feedback delay of system definition for the tunnel burst, provides in system broadcast message.
Access link feedback for tunneling data need upload to MR-BS, and described empty data should determine according to feedback model, specifically are divided into:
(1) empty tunnel burst
As shown in Figure 5, if the feedback of MS uploads to MR-BS separately, described empty tunneling data should be the empty tunnel burst of corresponding MS.The RS that receives this sky tunnel burst should get started the time delay of calculating this tunnel burst feedback of forwarding.The burst of empty tunnel can be revised burst information unit (IE) the form realization in the MAP message in the existing IEEE802.16j standard rough draft by (but being not limited to).
Access link feedback for tunneling data need upload to MR-BS, if RS receives the burst of sky tunnel at the i frame, should feed back at (i+n) frame.Wherein n is determined by formula (1).
(2) happen suddenly in the empty set
As shown in Figure 6, the feedback of all MS is concentrated to upload to MR-BS if access RS collects, and described empty tunneling data should be to happen suddenly in the empty set.Receive that the RS that happens suddenly in this empty set should get started the time delay of calculating the corresponding concentrated feedback of this intensive data of forwarding.Burst can be revised burst information unit (IE) the form realization in the MAP message in the existing IEEE802.16j standard rough draft by (but being not limited to) in the empty set.
Access link feedback for tunneling data need upload to MR-BS, happens suddenly in the empty set if RS receives at the i frame, should feed back at (i+k) frame.Wherein 1 determine by formula (3).
k＝H*p+(H+1)*j+s (3)
S is a maximum delay of collecting all MS feedbacks in the formula (3), the same formula of other parameter-definitions
(1)。
Comprehensively above-mentioned (one) and (two) receive that the RS of sky data should get started the time delay of calculating this data feedback of forwarding.Empty data can be revised MAP message corresponding information unit (IE) form realization in the existing IEEE802.16j standard rough draft by (but being not limited to).
In the 3rd step, further the present invention is described in detail with specific embodiment in conjunction with the accompanying drawings:
(1) network topology structure
The configuration of embodiments of the invention 1 network topology as shown in Figure 1.MR-BS is by RS1 and RS2 relaying and communication link of terminal MS formation.
Embodiments of the invention 2,3,4 network topology configuration as shown in Figure 2.MR-BS is by RS1, and RS2 and RS3 relaying constitute tunnel links, and tunnel links terminal point RS3 and each MS constitute corresponding access link respectively.
(2) four specific embodiments
Described empty burst can be revised burst information unit (IE) the form realization in the MAP message in the existing IEEE802.16j standard rough draft by (but being not limited to).Described empty burst interface-free resources is that zero realization can have dual mode.
A kind of is empty burst mode of definition and corresponding empty burst IE.As shown in Figure 7, can utilize the reserved word among the descending MAP IE of RS HARQ to define an empty burst mode (0b0111=dummyHARQ burst).Accordingly, as shown in Figure 8, can define an empty burst information unit and comprise corresponding C id information and ACID information.In case RS finds this burst and is empty burst from RS HARQ DL MAP IE, will begin to be corresponding burst feedback calculation time delay according to cid information and ACID information.
Another is to keep existing HARQ MAP pattern and burst IE form constant, just directly zero filling in relevant territory (for example message length and take resource).Can there be seven kinds of forms in descending sub-burst information unit in the present IEEE802.16 standard, except catching up with merging (Chase), also has incremental redundancy convolutional turbo (IR CTC), incremental redundancy convolution code (IR CC), MIMO are caught up with merging (MIMO Chase), MIMO IR, MIMO IR CC, and MIMO STC, corresponding, also have seven kinds of different sky bursts.Though it is less that this method is revised agreement, bigger for the interface-free resources waste, because transmitted a lot of zero bytes.
Described empty tunneling data can be revised burst information unit (IE) the form realization in the MAP message in the existing IEEE802.16j standard rough draft by (but being not limited to).Described empty burst interface-free resources is that zero realization can have dual mode.
A kind of is empty burst mode of definition and corresponding empty burst IE.As shown in Figure 7, can utilize the reserved word among the RS HARQ DL MAP IE to define an empty burst mode (the empty burst of 0b0111=dummy HARQ burst).Accordingly, as shown in Figure 8, can define an empty burst information unit and comprise corresponding TCID information and feedback channel sign (ACID) information.In case RS finds this burst and is empty burst from RSHARQ DL MAP IE, will begin to be corresponding burst feedback calculation time delay according to TCID information and ACID information.
Another is to keep existing RS DL HARQ MAP pattern and burst IE form constant, just directly zero filling in relevant territory (for example message length and take resource).Accordingly, should fill son burst compression CID (RCID) with TCID.Can there be seven kinds of forms in descending sub-burst information unit in the present IEEE802.16 standard, except catching up with merging (Chase), also has incremental redundancy convolutional turbo (IR CTC), incremental redundancy convolution code (IR CC), MIMO are caught up with merging (MIMO Chase), MIMO IR, MIMO IR CC, and MIMO STC, corresponding, also have seven kinds of different sky bursts.Though it is less that this method is revised agreement, bigger for the interface-free resources waste, because transmitted a lot of zero bytes.
Merit attention,, jump length Hop Depth territory among the RS HARQ DL MAP IE of dual mode and must fill rather than fill according to tunnel links according to whole link in order to use formula (2).Calculating Hop Depth should be terminal point with the terminal point of tunnel links.
Fig. 5 and Fig. 6 have provided the embodiment 3 and the embodiment 4 of the different feedback mechanisms of access link among the tunnel HARQ.The burst transfer of MS is from RS3 at this moment, and after RS1, RS2 and RS3 received corresponding empty data, being triggered began to calculate the moment of the data feedback of transmitting corresponding burst.
Among the described embodiment 3, corresponding empty data are the burst of empty tunnel, and described empty tunnel burst interface-free resources is that zero implementation is identical with embodiment 1 with RS calculation delay method.Wherein IE use CID is the CID of the corresponding son burst of access link transmission MS.
Among the described embodiment 4, corresponding empty data are to happen suddenly in the empty set, receive that the RS that happens suddenly in the empty set begins to calculate feedback delay according to formula (3).In order to use formula (3), MR-BS should provide in broadcast and insert the maximum delay that RS collects the MS feedback.
Among the described embodiment 4, empty burst interface-free resources is that zero implementation method and embodiment 2 are similar, unique not being both with concentrating burst CID (MCID) to replace TCID among the embodiment 2.Decision when MCID is happened suddenly in sending empty set by MR-BS.
At last, the above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of method that triggers relaying computed HARQ downlink data delay of feedback is applied in the multi-hop relay network, it is characterized in that, may further comprise the steps:
1.1) defining empty data, these sky data are the data that do not take interface-free resources;
1.2) receive that the relaying of described empty data gets started the time delay of calculating forwarding corresponding data feedback.
2, according to the described method of claim 1, it is characterized in that, described forwarding is that non-tunnel is transmitted, described empty data are empty bursts, feed back behind the n frame of relaying after receiving described empty burst, described calculating is n=H*p+ (H+1) * j, and wherein: H is the jumping figure that relaying leaves link terminal, p is the fixed delay frame number of relaying, and j is system definition and the HARQ feedback delay that provides in system broadcast message.
3, according to the described method of claim 1, it is characterized in that, described forwarding is that the tunnel is transmitted, described empty data are empty tunneling datas, feed back behind the m frame of relaying after receiving described empty tunneling data, described calculating is m=M*q+ (M+1) * k, and wherein: M is the jumping figure that relaying leaves termination point of a tunnel; Q is the fixed delay frame number of relaying for tunneling data; K is system definition and the HARQ feedback delay for tunneling data that provides in system broadcast message.
4, according to the described method of claim 3, it is characterized in that, described empty tunneling data is the empty tunnel burst of corresponding terminal, feed back behind the n frame of relaying after receiving described empty tunnel burst, described calculating is n=H*p+ (H+1) * j, wherein: H is the jumping figure that relaying leaves link terminal, and p is the fixed delay frame number of relaying, and j is system definition and the HARQ feedback delay that provides in system broadcast message.
5, according to the described method of claim 3, it is characterized in that, described empty tunneling data is to happen suddenly in the empty set, feed back behind the k frame after relaying happens suddenly in receiving described empty set, described calculating is k=H*p+ (H+1) * j+s, and wherein: H is the jumping figure that relaying leaves link terminal, and p is the fixed delay frame number of relaying, j is system definition and the HARQ feedback delay that provides in system broadcast message, and s is a maximum delay of collecting all terminals feedbacks.
According to claim 1,2 or 3 described methods, it is characterized in that 6, described empty data are by revising the burst information unit form realization in the MAP message in the existing IEEE802.16j standard rough draft.
According to the described method of claim 6, it is characterized in that 7, described modification is to utilize burst mode of reserved word definition and corresponding empty burst information unit.
According to the described method of claim 7, it is characterized in that 8, described empty burst information unit comprises cid information or TCID and ACID information.
9, according to the described method of claim 6, it is characterized in that, described modification is zero filling in relevant territory, and among merging, MIMO IR, MIMO IR CC and the MIMO STC any catches up with except catching up with merging, incremental redundancy convolutional turbo, incremental redundancy convolution code, MIMO in described burst information unit.
According to the described method of claim 9, it is characterized in that 10, described relevant territory comprises message length and takies resource.
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| CN101964704B (en) * | 2009-07-23 | 2013-06-05 | 华为技术有限公司 | Hybrid automatic retransmission request communication method, device and communication system |
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| KR100827969B1 (en) * | 2006-02-17 | 2008-05-08 | 삼성전자주식회사 | Apparatus and method for operating automatic repeat request in a broadband wireless access communication system |
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