CN101697630B - Method and device for reporting status of wireless link extended buffer area - Google Patents

Method and device for reporting status of wireless link extended buffer area Download PDF

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CN101697630B
CN101697630B CN200910236511.2A CN200910236511A CN101697630B CN 101697630 B CN101697630 B CN 101697630B CN 200910236511 A CN200910236511 A CN 200910236511A CN 101697630 B CN101697630 B CN 101697630B
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rlc
statistical value
sent
statistical
bsr
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CN101697630A (en
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范小岗
周晓星
何建伟
王吉文
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ZTE Corp
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ZTE Corp
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Abstract

The invention discloses a method for processing a status report of a wireless link buffer area, which is used for overcoming the defect that in the prior art, an entity cannot be ended normally after an AM RLC entity loses STATUS PDU under certain condition. Under the condition that the AM RLC entity sends the last wireless link control protocol data unit and the status report returned by a peer-to-peer AM RLC entity is lost, when an MAC layer counts the status reports of the buffer area for the next time, if the quantity of the data to be sent buffered in a wireless link layer and a packet data convergence protocol layer is 0, the size of the last protocol data unit sent by the current AM RLC entity is used as a BSR statistical value which is returned to the MAC layer. The method and the device adopt statistics of the quantity of retransmitted data caused by polling under specific conditions while performing BSR counting on an RLC layer, and eliminate the deadlock state probably causing system unlimited waiting.

Description

A kind of method of reporting status of wireless link extended buffer area and device
Technical field
The present invention relates to radio digital communication field, particularly relate to wireless spread-spectrum technology (Radio LinkControl, RLC) entity to the method for Buffer Status Report and device.
Background technology
Universal mobile telecommunications system (the Universal Mobile Telecommunications System of evolution, UMTS) terrestrial radio access network (Evolved UMTS Terrestrial Radio Access Network, E-UTRAN) wireless chain control layer comprises the RLC entity of three types: transparent mode (TransparentMode, TM) RLC entity, Unacknowledged Mode (Unacknowledged Mode, the RLC entity of RLC entity UM) and affirmation mode (Acknowledged Mode, AM).Wherein the RLC entity of AM pattern utilizes HARQ (Automatic Retransmission Request, ARQ) mechanism to provide reliable data transmission service.
In ARQ mechanism in rlc layer, when the transmitter side of the RLC entity of AM pattern sends packet, be 1 by poll mark position in the bag that can in the end send (and send be the bag of 1 containing poll flag bit after start a poll retransmission timer), to RLC entity requests status report (STATUS PDU) of the AM pattern of equity, to obtain the reception condition of peer RLC entities.It is after the bag of 1 that the RLC entity of equity AM pattern receives poll flag bit, and meeting status report is to the reception condition of the RLC entity report data bag of the AM pattern of transmit leg.If all data all successful transmission of, then end data transmitting procedure; If the RLC entity of the AM pattern of transmit leg does not receive STATUS PDU, so after poll retransmission timer time-out, protocol Data Unit (the Protocol Data Unit also do not confirmed needing repeating transmission one to send, PDU), and be 1 by its poll mark position, restart poll retransmission timer.
In E-UTRAN, lower one deck of rlc layer is media access control layer (Medium AccessControl, MAC), and the data-reusing of the some that rlc layer is mainly delivered by MAC layer in a mac frame, and sends.A kind of Buffer Status Report (BufferStatus Reporting is contained in mac frame, BSR) sub-head, this height head is used for depositing the data volume to be sent being buffered in user equipment side (User Equipment, UE) of MAC layer statistics.MAC sends this height head to network side, and network side comes for UE distributes uplink authorization according to the data volume of adding up in BSR, the data volume that namely next time can send to network side.
The BSR of MAC layer obtains according to the data volume to be sent of buffer memory in inquiry rlc layer and packet data convergence protocol (Packet DataConvergence Protocol, PDCP).In current Long Term Evolution (Long Time Evolution, LTE) rlc layer protocol version V860, the data volume to be sent of rlc layer buffer memory comprises following three parts:
(1) RLC service data unit (RLC SDU) to be sent;
(2) rlc protocol data cell (RLC PDU) to be retransmitted under AM pattern or its part;
(3) trigger and the control PDU do not forbidden;
Its statistic processes as shown in Figure 1, as can be seen from Figure, after sending data under wherein not comprising AM pattern, the poll flag bit that poll retransmission timer time-out causes resends produced data, namely, when not having new sent Deta bearer poll flag bit, AM RLC entity is in wait state always.
In some cases, this problem can be very serious.After AM RLC entity sends last bag (poll territory is wherein 1), start poll retransmission timer, and wait for the STATUS PDU of reciprocity AM RLC entity, but never wait until STATUS PDU (this packet loss), from this moment, the data to be transmitted of BSR statistics current logic channel is all 0 each time, network side would not distribute uplink authorization, so current AM RLC entity may be in wait state forever, and cannot complete data transmission procedure.
Summary of the invention
In view of this, main purpose of the present invention is the processing method providing a kind of wireless link Buffer Status Report, and for solving after the AM RLC entity existed in prior art loses STATUSPDU in any case, entity cannot the defect of normal termination.
For achieving the above object, technical scheme of the present invention is achieved in that
A method for reporting status of wireless link extended buffer area, comprising:
Last wireless link control protocol data cell (RLC PDU) is sent at wireless spread-spectrum technology (AM RLC) entity of affirmation mode, when the status report (STATUSPDU) that reciprocity AM RLC entity returns is lost, next medium education (MAC) layer carry out Buffer Status Report (BSR) add up time, if the data volume to be sent of buffer memory is 0 in radio link layer, then the size of last protocol Data Unit (PDU) sent of current AM RLC entity is returned to MAC layer as BSR statistical value.
Further, in described radio link layer, the data volume to be sent of buffer memory comprises: the data volume of Radio Link Service data cell (RLC SDU) to be sent; The data volume of radio link protocol data cell (RLC PDU) part to be retransmitted to be retransmitted under affirmation mode; Trigger and the size of the control protocol data cell of not forbidding.
Further, described method is specially:
A, AM RLC entity carries out the data quantitative statistics to be sent of buffer memory in described radio link layer after receiving the BSR statistics instruction of MAC layer, its value is the summation of following statistical value:
Add up the data volume of RLC service data unit to be sent;
The data volume of rlc protocol data cell part to be retransmitted to be retransmitted under statistics AM pattern;
The size of the control protocol data cell that statistics triggers and do not forbid;
Whether B, the data volume to be sent judging buffer memory in described radio link layer are 0, if 0 performs step C; Otherwise perform step D;
C, judge whether trigger poll in current AM RLC entity, if so, then the size of last RLC PDU sent is returned to MAC layer as BSR statistical value; Otherwise return 0 to MAC layer;
D, the data volume to be sent of buffer memory in described radio link layer is returned to MAC layer as the BSR statistical value of current AM RLC entity.
The present invention also proposes a kind of device of reporting status of wireless link extended buffer area, comprising:
Radio link layer buffer data size statistical module, for the data quantitative statistics to be sent of buffer memory in radio link layer;
Buffer Status Report statistical value feedback module, MAC layer is fed back to as the statistical value of Buffer Status Report (BSR) for the statistical value that described radio link layer buffer data size statistical module obtained, if described statistical value is 0 and the wireless spread-spectrum technology of affirmation mode (AM RLC) entity triggers poll, then the size of last RLC PDU sent is returned to MAC layer as BSR statistical value.
Further, described radio link layer buffer data size statistical module comprises:
Service data unit statistical module, for adding up the data volume of RLC service data unit to be sent;
Rlc protocol data cell statistical module, for the data volume of rlc protocol data cell part to be retransmitted to be retransmitted under adding up AM pattern;
Control protocol data cell statistical module, triggers and the size of the control protocol data cell of not forbidding for adding up;
The statistical value that described radio link layer buffer data size statistical module obtains be above-mentioned three modules obtain statistical value and.
Further, described Buffer Status Report statistical value feedback module comprises:
Data volume judge module, for judging whether the statistical value that described radio link layer buffer data size statistical module obtains is 0, if 0 notice poll judge module performs corresponding function; Otherwise described statistical value is sent to statistical value feedback module as BSR statistical value;
Poll judge module, for judging whether AM RLC entity triggers poll, if so, then sends to statistical value feedback module using the size of last RLC PDU sent as BSR statistical value; Otherwise 0 value is sent to statistical value feedback module as BSR statistical value;
Statistical value feedback module, for feeding back to MAC layer by the BSR received statistical value.
The present invention improves on the basis of existing BSR statistical method, adding the data quantitative statistics to the repeating transmission caused by poll under special circumstances when carrying out the BSR statistics of rlc layer, eliminating in original scheme the deadlock state that system may be caused unrestrictedly to wait for.
Accompanying drawing explanation
Fig. 1 is the Buffer Status Report statistic processes of original technical scheme;
Fig. 2 is the flow chart that the present invention realizes rlc layer Buffer Status Report statistics;
Fig. 3 is the installation drawing that the present invention realizes rlc layer Buffer Status Report statistics.
Embodiment
Basic thought of the present invention is: if when poll retransmission timer time-out directly using data to be confirmed as retransmission data, if so now there have been again the data that can send (such as: high level delivers the situations such as data of coming), so multiplely will send a packet, will contradict with the regulation in agreement like this, existing protocol regulation only when there is no new sent data just using data to be confirmed as retransmission data.Therefore the present invention does not adopt directly by the method for data packet retransmission to be confirmed, and takes increase to cause the method for retransmission data quantitative statistics to realize the forelock of the packet of carrying poll flag bit to send to poll.
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
Fig. 2 is the process flow figure of wireless link Buffer Status Report of the present invention, and concrete steps are:
After step 201:AM RLC entity receives the BSR statistics instruction of MAC layer, perform the data quantitative statistics to be sent of radio link layer buffer memory, the content of statistics comprises:
(1) data volume of RLC service data unit (RLC SDU) to be sent is added up; The scope of statistics comprises: the still unmapped part being not yet mapped to the RLC PDU that RLC SDU data cell in RLC PDU and part have mapped; Statistical method is added up at the value of the data volume of RLC SDU to be sent.
(2) data volume of rlc protocol data cell (RLC PDU) part to be retransmitted to be retransmitted under adding up AM pattern;
The data volume of described part to be retransmitted refers to: if whole rlc protocol data cell all needs to retransmit, then add up the data volume of its whole protocol Data Unit, if what retransmit is the part of rlc protocol data cell, then add up the data volume that it needs repeating transmission part.
The scope of this step statistics comprises instruction in STATUS PDU and requires the RLC PDU of re-transmission, does not comprise those and has sent just at the RLC PDU of wait acknowledge.Statistical method is added up at the value of data volume to be retransmitted.
(3) statistics triggers and the size of control PDU of not forbidding; Trigger when being included in statistics, and do not have forbidden control PDU, but do not comprise and triggering forbidden status PDU data volume, statistical method is the reception condition according to reception buffer zone, determines the size of status PDU;
Step 202: in determining step 201, whether the summation of the statistical value of three partial contents is 0, if be 0, performs step 203; Otherwise enter step 206;
Step 203: judge whether trigger poll in current AM RLC entity, if triggered, then performs step 204; Otherwise perform step 205;
Step 204: using the size of last RLC PDU sent as BSR value, and return to MAC layer;
Step 205: return 0 value to MAC layer;
Step 206: by first three step statistics value and return to MAC layer, as the BSR statistical value of current AM RLC entity.
Based on said method, the present invention also proposes a kind of device of reporting status of wireless link extended buffer area, as shown in Figure 3, comprising: radio link layer buffer data size statistical module and buffer state report statistics value feedback module.
Radio link layer buffer data size statistical module, for the data quantitative statistics to be sent of buffer memory in radio link layer;
Buffer Status Report statistical value feedback module, MAC layer is fed back to as the statistical value of Buffer Status Report (BSR) for the statistical value that described radio link layer buffer data size statistical module obtained, if described statistical value is 0 and the wireless spread-spectrum technology of affirmation mode (AM RLC) entity triggers poll, then the size of last RLC PDU sent is returned to MAC layer as BSR statistical value.
Radio link layer buffer data size statistical module comprises service data unit statistical module, rlc protocol data cell statistical module, control protocol data cell statistical module further.
Service data unit statistical module, for adding up the data volume of RLC service data unit to be sent;
Rlc protocol data cell statistical module, for the data volume of rlc protocol data cell part to be retransmitted to be retransmitted under adding up AM pattern;
Control protocol data cell statistical module, triggers and the size of the control protocol data cell of not forbidding for adding up;
The statistical value that described radio link layer buffer data size statistical module obtains be above-mentioned three modules obtain statistical value and.
Buffer Status Report statistical value feedback module comprises data volume judge module, poll judge module, statistical value feedback module further.
Data volume judge module, for judging whether the statistical value that described radio link layer buffer data size statistical module obtains is 0, if 0 notice poll judge module performs corresponding function; Otherwise described statistical value is sent to statistical value feedback module as BSR statistical value;
Poll judge module, for judging whether AM RLC entity triggers poll, if so, then sends to statistical value feedback module using the size of last RLC PDU sent as BSR statistical value; Otherwise 0 value is sent to statistical value feedback module as BSR statistical value;
Statistical value feedback module, for feeding back to MAC layer by the BSR received statistical value.
In this programme, if system is in the situation identical with former scheme system: AM RLC entity in the end comprises poll in a RLC PDU sent, the STATUS PDU that the AM RLC entity of equity returns loses, when next MAC layer carries out BSR statistics, the return value of current AM RLC entity is at least the size of the PDU that last sends, instead of original system return 0.When next MAC layer scheduling, will dispatch current AM RLC entity, AM RLC entity will resend last RLCPDU, and its poll territory is set to 1, reports to reciprocity AM RLC entity again application status.Even if AM entity does not receive STATUS PDU always, so can exceed restriction due to the repeatedly re-transmission of last PDU, and terminate the process of transmitting of current AM entity, AM entity can not be caused infinitely to wait for and be absorbed in deadlock.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims (6)

1. a method for reporting status of wireless link extended buffer area, is characterized in that, comprising:
Last wireless link control protocol data cell (RLC PDU) is sent at wireless spread-spectrum technology (AM RLC) entity of affirmation mode, when the status report (STATUSPDU) that reciprocity AM RLC entity returns is lost, next medium education (MAC) layer carry out Buffer Status Report (BSR) add up time, if the data volume to be sent of buffer memory is 0 and current AM RLC entity triggers poll in radio link layer, then the size of last protocol Data Unit (PDU) sent of current AM RLC entity is returned to MAC layer as BSR statistical value.
2. method according to claim 1, is characterized in that, in described radio link layer, the data volume to be sent of buffer memory comprises: the data volume of Radio Link Service data cell (RLC SDU) to be sent; The data volume of radio link protocol data cell (RLC PDU) part to be retransmitted to be retransmitted under affirmation mode; Trigger and the size of the control protocol data cell of not forbidding.
3. method according to claim 1, is characterized in that, described method is specially:
A, AM RLC entity carries out the data quantitative statistics to be sent of buffer memory in described radio link layer after receiving the BSR statistics instruction of MAC layer, its value is the summation of following statistical value:
Add up the data volume of RLC service data unit to be sent;
The data volume of rlc protocol data cell part to be retransmitted to be retransmitted under statistics AM pattern;
The size of the control protocol data cell that statistics triggers and do not forbid;
Whether B, the data volume to be sent judging buffer memory in described radio link layer are 0, if 0 performs step C; Otherwise perform step D;
C, judge whether trigger poll in current AM RLC entity, if so, then the size of last RLC PDU sent is returned to MAC layer as BSR statistical value; Otherwise return 0 to MAC layer;
D, the data volume to be sent of buffer memory in described radio link layer is returned to MAC layer as the BSR statistical value of current AM RLC entity.
4. a device for reporting status of wireless link extended buffer area, is characterized in that, comprising:
Radio link layer buffer data size statistical module, for the data quantitative statistics to be sent of buffer memory in radio link layer;
Buffer Status Report statistical value feedback module, MAC layer is fed back to as the statistical value of Buffer Status Report (BSR) for the statistical value that described radio link layer buffer data size statistical module obtained, if described statistical value is 0 and the wireless spread-spectrum technology of affirmation mode (AM RLC) entity triggers poll, then the size of last RLC PDU sent is returned to MAC layer as BSR statistical value.
5. device according to claim 4, is characterized in that, described radio link layer buffer data size statistical module comprises:
Service data unit statistical module, for adding up the data volume of RLC service data unit to be sent;
Rlc protocol data cell statistical module, for the data volume of rlc protocol data cell part to be retransmitted to be retransmitted under adding up AM pattern;
Control protocol data cell statistical module, triggers and the size of the control protocol data cell of not forbidding for adding up;
The statistical value that described radio link layer buffer data size statistical module obtains be described service data unit statistical module, described rlc protocol data cell statistical module and described control protocol data cell statistical module obtain statistical value and.
6. device according to claim 4, is characterized in that, described Buffer Status Report statistical value feedback module comprises:
Data volume judge module, for judging whether the statistical value that described radio link layer buffer data size statistical module obtains is 0, if 0 notice poll judge module performs corresponding function; Otherwise described statistical value is sent to statistical value feedback module as BSR statistical value;
Poll judge module, for judging whether AM RLC entity triggers poll, if so, then sends to statistical value feedback module using the size of last RLC PDU sent as BSR statistical value; Otherwise 0 value is sent to statistical value feedback module as BSR statistical value;
Statistical value feedback module, for feeding back to MAC layer by the BSR received statistical value.
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CN102264132A (en) * 2010-05-26 2011-11-30 电信科学技术研究院 Method and equipment for distributing uplink shared channel resources
CN102957522B (en) * 2011-08-24 2017-05-10 中兴通讯股份有限公司 RLC (radio link control) AM (acknowledged mode) status report processing method and system
EP3799334A4 (en) 2018-05-21 2021-05-26 Beijing Xiaomi Mobile Software Co., Ltd. Method and apparatus for setting format of buffer status report
CN108933645B (en) * 2018-06-04 2021-07-23 熊猫电子集团有限公司 Efficient active polling method for terminal
CN109936858B (en) * 2019-02-20 2022-03-25 武汉虹信科技发展有限责任公司 Method and system for processing wireless link control data

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