CN101222303B - Method for implementing media access control layer ascending feedback - Google Patents
Method for implementing media access control layer ascending feedback Download PDFInfo
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- CN101222303B CN101222303B CN2007100012367A CN200710001236A CN101222303B CN 101222303 B CN101222303 B CN 101222303B CN 2007100012367 A CN2007100012367 A CN 2007100012367A CN 200710001236 A CN200710001236 A CN 200710001236A CN 101222303 B CN101222303 B CN 101222303B
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Abstract
The invention provides a realization method for media to access control layer uplink feedback. An automatic retransmission request entity is added on a high-speed downlink packet access media access control layer MAC-hs entity, a receiving end takes advantage of a protocol data unit MAC-ePDU of a high-speed downlink packet access media access control layer to feedback a state report to a sending end, the content of the state report comprises transmission sequence numbers of transmission blocks needing to be retransmitted by the MAC-hs of the sending end. The proposal improves the retransmission efficiency, the data rate and the throughput to a certain degree.
Description
Technical field
The present invention relates to the implementation method of media access control layer ascending feedback in the wireless communication system, relate in particular to the implementation method of the media access control layer ascending feedback that is applicable to the high data rate Packet Service.
Background technology
Insert in the WCDMA system in the 3G (Third Generation) Moblie Wideband Code Division Multiple Access (WCDMA), repeat requests entity A RQ is positioned at the wireless chain control layer RLC of radio network controller (RNC) automatically.The ARQ entity adopts sliding window mechanism, and whether needs are retransmitted corresponding protocol data cell RLC PDU to the state report judging that the ARQ entity of transmitting terminal is fed back according to receiving terminal ARQ entity.Receiving terminal ARQ entity has periodicity, RLC PDU loss detection, detects three kinds of triggering modes in turn to the transmitting terminal status report.Comprise acknowledge message ACK or non-acknowledge message NACK in the status report.The form of status report PDU has three kinds of bitmap BITMAP, tabulation LIST, tabulation RLIST.The mechanism that reduces the status report frequency has transmitting terminal to forbid detection in turn, the report of receiving terminal illegal state.
Support the automatic repeat requests entity of the mixing HARQ of high-speed downlink packet access HSDPA function to be positioned at the media access control layer of base station, the employing multiple tracks stops waiting the HARQ agreement of incremental redundancy mode.Receiving terminal HARQ entity is to transmitting terminal HARQ entity response confirmation message ACK or non-acknowledge message NACK, and transmitting terminal HARQ entity is received the redundancy versions that will retransmit corresponding transmission block after the NACK message.HARQ is a kind of link circuit self-adapting function of utilizing physical layer retransmission, takies shorter Loop Round Trip Time RTT, recovers wrong efficient and retransmits high than wireless chain control layer ARQ.The residual errors that HARQ fails to recover still can be recovered by the re-transmission of wireless chain control layer ARQ entity.
In order further to improve data rate and spectrum efficiency on the basis of high-speed downlink packet access HSDPA and high speed uplink packet access HSUPA, the 3G (Third Generation) Moblie partnership projects is organized 3GPP (The3rd Generation Partnership Project) to propose high-speed packet and is inserted the HSPA evolution items.In this project, proposed to increase the tentative programme of ARQ sublayer for the improvement of radio interface layer 2 at base station node B, main purpose is to reduce retransmission delay.Described ARQ sublayer may be realized at the wireless chain control layer RLC or the media access control layer MAC of base station node B, the former needs the wireless chain control layer rlc protocol of wireless access network RAN to end in base station node B, and the latter need increase the ARQ functions of retransmission on the HARQ of MAC-hs layer agreement.
Fig. 1 .1～1.5th, prior art MAC-e protocol data unit frame structural representation.
MAC-d PDU from same logic channel is MAC-es SDU (Fig. 1 .1), adds after the serial connection to generate MAC-es PDU (Fig. 1 .2) behind MAC-es header and the transmission sequence number TSN;
From the multiplexing MAC-e header (DDI that adds of the MAC-es PDU of Different Logic channel
1, N
1) .. (DDI
n, N
n) back generation MAC-e PDU, under the situation of carrying schedule information SI, at (DDI
n, N
n) after add DDI
0Information (Fig. 1 .3); Schedule information SI also can be used as independent MAC-e PDU and sends (Fig. 1 .4);
The frame format of schedule information SI is shown in Fig. 1 .5, and wherein the implication of each field is as follows:
Subscriber equipment power headroom UE Power Headroom (UPH) takies 5bit; Total E-DCH buffer state Total E-DCH Buffer Status (TEBS) takies 5bit; Highest priority logical channel buffer state Highest priority Logical channel Buffer Status (HLBS) takies 4bit; Highest priority logical channel sign Highest priority Logical channel ID (HLID) takies 4bit.
Concrete scheme in base station node B increase ARQ sublayer does not also have conclusion at present, do not determine whether to increase this ARQ sublayer, do not determine that this sublayer is to realize or realize at the MAC layer at rlc layer yet, do not have further scheme yet for the realization of this ARQ sublayer status report protocol data unit frame structure.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of implementation method of media access control layer ascending feedback, and this scheme has improved retransmission efficiency, data rate and throughput to a certain extent.
In order to address the above problem, the present invention proposes a kind of implementation method of media access control layer ascending feedback, insert media access control layer MAC-hs entity in high speed downlink packet and increase automatic repeat requests entity, receiving terminal utilizes the protocol Data Unit MAC-e PDU of high speed uplink packet access media access control layer to the transmitting terminal condition report feedback, the transmission sequence number of the transmission block that the MAC-hs that the content of this status report comprises needs transmitting terminal retransmits.
Further, said method also can have following characteristics: (1) transmitting terminal MAC-hs entity sends transmission block MAC-hs PDU; (2) receiving terminal MAC-hs entity reorders according to MAC-hs PDU sequence number, as detects the MAC-hsPDU sequence number of losing in the process that receives MAC-hs PDU, and notice MAC-e entity generates status report; (3) the MAC-e entity generates status report and it is fed back to transmitting terminal, and described status report comprises the sequence number that needs the MAC-hs PDU that transmitting terminal retransmits.
Further, said method also can have following characteristics: step (3) also comprises afterwards: (4) transmitting terminal MAC-e entity receives the MAC-e PDU of receiving terminal, and judge when wherein comprising state report information the MAC-hsPDU of the MAC-hs PDU sequence number representative of notice MAC-hs entity retransmits lost.
Further, said method also can have following characteristics: in the step (3), the frame structure of described status report has utilized the position of schedule information among the existing agreement MAC-e PDU, and this status report and other upstream data are multiplexing to be sent together, with the DDI in the MAC-e header
0Represent that this MAC-e PDU comprises schedule information or state report information; Perhaps, described status report sends as independent MAC-e PDU transmission block.
Further, said method also can have following characteristics: schedule information of the present invention needs schedule information among the existing agreement MAC-e PDU is expanded the first Flag field, is schedule information or status report with the information of distinguishing wherein.
Further, said method also can have following characteristics: in the step (3), described status report comprises flag bit Flag, the number N of sequence number and N sequence number TSN, described Flag is used to represent that MAC-e PDU comprises schedule information or status report, described N, expression needs the number of the MAC-hs PDU that transmitting terminal retransmits, described TSN, and expression needs the sequence number of the MAC-hs PDU that transmitting terminal retransmits.
Further, said method also can have following characteristics: in the step (3), described status report comprises flag bit Flag, is one or more groups sequence number TSN and territory sign F after this Flag, wherein, described Flag, be used to represent that MAC-e PDU comprises schedule information or status report, described TSN, expression needs the sequence number of the MAC-hs PDU that transmitting terminal retransmits, described F is used to represent that the content of back is sequence number or the end of text of representing this status report.
Further, said method also can have following characteristics: when comprising status report among the flag bit Flag indication MAC-e PDU, the length of this status report is the variable-length with maximum length restriction, determines Len req according to the number of the TSN of required actual feedback.
A kind of frame structure of status report of automatic repeat requests entity comprises:
Flag bit Flag, the number N of sequence number, with N sequence number TSN, described Flag, be used to represent that MAC-e PDU comprises schedule information or status report, described N, expression needs the number of the MAC-hs PDU of transmitting terminal re-transmission, described TSN, expression needs the sequence number of the MAC-hsPDU that transmitting terminal retransmits; And/or
Flag bit Flag, after this Flag one or more groups sequence number TSN and territory thereof sign F, wherein, described Flag, be used to represent that MAC-e PDU comprises schedule information or status report, described TSN, expression needs the sequence number of the MAC-hs PDU that transmitting terminal retransmits, described F is used to represent that the content of back is sequence number or the end of text of representing this status report.
Further, the frame structure of above-mentioned status report also can have following characteristics: when comprising status report among the flag bit Flag indication MAC-e PDU, the length of this status report is the variable-length with maximum length restriction, determines Len req according to the number of the TSN of required actual feedback.
Compared with prior art, the invention provides a kind of after the MAC-hs layer increases the ARQ sublayer method of condition report feedback, this scheme has improved retransmission efficiency, data rate and throughput to a certain extent.
Description of drawings
Fig. 1 .1～1.5th, prior art MAC-e protocol data unit frame structural representation.
Fig. 2 .1～2.3rd, MAC-e protocol data unit frame structural representation among the embodiment.
Embodiment
Realize at media access control layer MAC described ARQ of the present invention sublayer, promptly increases the ARQ functions of retransmission on the HARQ of MAC-hs layer agreement.Increase after the ARQ sublayer, can recover a part of HARQ residual errors, thereby the probability that needs rlc layer ARQ to retransmit is further reduced, the mistake that described newly-increased ARQ fails to recover in the sublayer still can be retransmitted by the ARQ of rlc layer to be recovered.
After high-speed downlink packet access HSDPA media access control layer MAC-hs entity increases ARQ sublayer function, the high speed uplink packet of utilizing receiving terminal inserts the MAC-e protocol Data Unit condition report feedback of HSUPA media access control layer, and the content of status report is to need the transmission sequence number TSN of the transmission block that transmitting terminal MAC-hs retransmits and the number of TSN.
Describe the present invention in detail below in conjunction with accompanying drawing.
A kind of implementation method of media access control layer ascending feedback may further comprise the steps:
Step 110, transmitting terminal MAC-hs entity stops waiting the HARQ agreement to send transmission block MAC-hs PDU according to multiple tracks;
Step 120, receiving terminal MAC-hs entity is in the process that receives MAC-hs PDU, and TSN reorders according to MAC-hs PDU sequence number, as detects the MAC-hs PDU sequence number TSN that loses, execution in step 130;
If do not detect the MAC-hs PDU sequence number TSN that loses, then do not need to report sequence number.
Step 130, receiving terminal MAC-hs entity notice MAC-e entity generates status report;
Step 140, MAC-e entity generate status report and it are transferred to transmitting terminal;
Described status report adopts new frame structure.In order to realize that minimum is changed in former protocols having, better compatible.The frame structure of this status report has utilized the position of SI information among the existing agreement MAC-e PDU in the present embodiment.Simultaneously, schedule information of the present invention needs the first Flag field of SI information expansion among the existing agreement MAC-e PDU, is SI or status report with the information of distinguishing wherein, shown in Fig. 2 .1.
Status report can send together or send as independent MAC-e PDU transmission block with other upstream data is multiplexing according to its physical length.When described status report and other upstream data is multiplexing when sending, with the DDI in the MAC-e header together
0Represent that this MAC-e PDU comprises schedule information or state report information.
In embodiment one, the frame structure that status report is followed comprises shown in Fig. 2 .2:
Flag is a flag bit, is 1bit, and the content that is used to distinguish thereafter is schedule information or status report, and this position is got and was expressed as schedule information SI at 0 o'clock, and this position is got and was expressed as status report at 1 o'clock; The length of SI information is fixed, the length of state report information is variable, when comprising status report among the flag bit Flag indication MAC-e PDU, the length of this status report is the variable-length with maximum length restriction, determines Len req according to the number of the TSN of required actual feedback;
In this application example, the maximum length of state report information is: 5+32x6=197bit.
N represents number, is 5bit, represents the number of the TSN of the needs re-transmission that this status report comprises;
TSN is a transmission sequence number, is 6bit, and this sequence number is the transmission sequence number of losing, need the MAC-hs PDU that transmitting terminal retransmits, and this sequence number can be for a plurality of.
In embodiment two, the frame structure that status report is followed comprises shown in Fig. 2 .3:
Flag is a flag bit, is 1bit, and is identical among its implication and the embodiment one, is one or more groups sequence number TSN and end mark F after this Flag;
TSN is a transmission sequence number, is 6bit, and is identical among its implication and the embodiment one;
F is the territory sign, is 1bit, and the content of representing the back during value 0 is TSN, represents the end of text of this status report during value 1;
When adopting this frame structure, if be set to carry at most in the status report 32 TSN, then the maximum length of state report information is 32x6+32=224; If be set to carry at most in the status report 64 TSN, then maximum length is 64x6+64=448; The expense of this scheme is greater than embodiment one.
In the embodiment of reality, being provided with of field length may be not quite identical with the present invention, and for example N is set to 6bit, still also should think to belong to scope of the present invention.
Step 150, transmitting terminal MAC-e entity receives receiving terminal MAC-e PDU, judges when wherein comprising state report information, and notice MAC-hs entity is retransmitted the MAC-hsPDU of relevant TSN representative.
The present invention is directed to the scheme that increases the ARQ sublayer in the HSPA evolution items at the media access control layer MAC of base station, utilize high speed uplink packet to insert MAC-e protocol Data Unit feedback ARQ status report among the HSUPA, and realized a kind of ARQ status report frame structure.
Claims (9)
1. the implementation method of media access control layer ascending feedback, insert media access control layer MAC-hs entity in high speed downlink packet and increase automatic repeat requests entity, receiving terminal utilizes the protocol Data Unit MAC-e PDU of high speed uplink packet access media access control layer to the transmitting terminal condition report feedback, the transmission sequence number of the transmission block that the MAC-hs that the content of this status report comprises needs transmitting terminal retransmits; Described method is further divided into following steps:
(1) transmitting terminal MAC-hs entity sends transmission block MAC-hs PDU;
(2) receiving terminal MAC-hs entity reorders according to the MAC-hsPDU sequence number, as detects the MAC-hs PDU sequence number of losing in the process that receives MAC-hs PDU, and notice MAC-e entity generates status report;
(3) the MAC-e entity generates status report and it is fed back to transmitting terminal, and described status report comprises the sequence number that needs the MAC-hs PDU that transmitting terminal retransmits.
2. method according to claim 1 is characterized in that step (3) also comprises afterwards:
(4) transmitting terminal MAC-e entity receives the MAC-e PDU of receiving terminal, and judges when wherein comprising state report information, the MAC-hs PDU of the MAC-hs PDU sequence number representative of notice MAC-hs entity retransmits lost.
3. method according to claim 1 is characterized in that:
In the step (3), the frame structure of described status report has utilized the position of schedule information among the existing agreement MAC-e PDU, this status report and other upstream data are multiplexing to be sent together, represents that with the DDI0 in the MAC-e header this MAC-e PDU comprises schedule information or state report information; Perhaps, described status report sends as independent MAC-e PDU transmission block.
4. as method as described in the claim 2, it is characterized in that:
Schedule information of the present invention needs schedule information among the existing agreement MAC-e PDU is expanded the first Flag field, is schedule information or status report with the information of distinguishing wherein.
5. method according to claim 1 is characterized in that:
In the step (3), described status report comprises flag bit Flag, the number N of sequence number and N sequence number TSN, described Flag, be used to represent that MAC-e PDU comprises schedule information or status report, described N, expression needs the number of the MAC-hs PDU of transmitting terminal re-transmission, described TSN, expression needs the sequence number of the MAC-hs PDU that transmitting terminal retransmits.
6. method according to claim 1 is characterized in that:
In the step (3), described status report comprises flag bit Flag, after this Flag one or more groups sequence number TSN and territory sign F, wherein, described Flag is used to represent that MAC-e PDU comprises schedule information or status report, described TSN, expression needs the sequence number of the MAC-hsPDU that transmitting terminal retransmits, and described F is used to represent that the content of back is sequence number or the end of text of representing this status report.
7. as method as described in claim 5 or 6, it is characterized in that:
When comprising status report among the flag bit Flag indication MAC-e PDU, the length of this status report is the variable-length with maximum length restriction, determines Len req according to the number of the TSN of required actual feedback.
8. method as claimed in claim 3, the frame structure of this status report comprises:
Flag bit Flag, the number N of sequence number, with N sequence number TSN, described Flag, be used to represent that MAC-e PDU comprises schedule information or status report, described N, expression needs the number of the MAC-hs PDU of transmitting terminal re-transmission, described TSN, expression needs the sequence number of the MAC-hsPDU that transmitting terminal retransmits; And/or
Flag bit Flag, after this Flag one or more groups sequence number TSN and territory thereof sign F, wherein, described Flag, be used to represent that MAC-e PDU comprises schedule information or status report, described TSN, expression needs the sequence number of the MAC-hs PDU that transmitting terminal retransmits, described F is used to represent that the content of back is sequence number or the end of text of representing this status report.
9. method as claimed in claim 8 is characterized in that:
When comprising status report among the flag bit Flag indication MAC-e PDU, the length of this status report is the variable-length with maximum length restriction, determines Len req according to the number of the TSN of required actual feedback.
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| CN2007100012367A CN101222303B (en) | 2007-01-09 | 2007-01-09 | Method for implementing media access control layer ascending feedback |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2332297B1 (en) * | 2008-08-08 | 2018-10-03 | InterDigital Patent Holdings, Inc. | Method and apparatus for reporting a buffer status |
| CN102571304B (en) * | 2010-12-20 | 2014-11-19 | 上海中兴软件有限责任公司 | Method and system for sending packet uplink response |
| CN103166744A (en) * | 2011-12-08 | 2013-06-19 | 北京信威通信技术股份有限公司 | Method for dynamically sending acknowledgement (ACK) bitmap in automatic repeat request (ARQ) mechanism |
| US9363621B2 (en) | 2012-11-12 | 2016-06-07 | Huawei Technologies Co., Ltd. | System and method adopting a reliable stop-and-wait hybrid automatic repeat request protocol |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332921A (en) * | 1998-12-31 | 2002-01-23 | 诺基亚移动电话有限公司 | Measurement report transmission in telecommunications system |
| CN1411227A (en) * | 2001-09-25 | 2003-04-16 | 华为技术有限公司 | Method and device for promoting quick sliding of radio link control layer data transmission window |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332921A (en) * | 1998-12-31 | 2002-01-23 | 诺基亚移动电话有限公司 | Measurement report transmission in telecommunications system |
| CN1411227A (en) * | 2001-09-25 | 2003-04-16 | 华为技术有限公司 | Method and device for promoting quick sliding of radio link control layer data transmission window |
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