CN101064663A - Method for retransmitting data in wireless link control protocol - Google Patents
Method for retransmitting data in wireless link control protocol Download PDFInfo
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- CN101064663A CN101064663A CN 200610011804 CN200610011804A CN101064663A CN 101064663 A CN101064663 A CN 101064663A CN 200610011804 CN200610011804 CN 200610011804 CN 200610011804 A CN200610011804 A CN 200610011804A CN 101064663 A CN101064663 A CN 101064663A
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- data cell
- timer
- described data
- transmitting terminal
- data unit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/28—Timers or timing mechanisms used in protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
Abstract
The invention discloses a method of data retransmit in wireless chain control protocol, it characterized in that the sending end sends protocol data unit in wireless chain control protocol affirmance mode, setting a timer corresponding with said data unit, if the sending end receives the state report of un-received correctly come from receiving end, the sending end puts said data unit into the retransmit buffer, and detects whether the timer which is corresponding with said data unit is overtime during attemper course of buffer, if it is overtime, sending said data unit and starting corresponding timer, if else, waiting for next buffer attemper. The invention resolves problem of bandwidth waste induced by retransmit by protocol data unit on condition that the state report is frequent, the time of retransmit is decreased, and the utilization efficiency of bandwidth is increased.
Description
Technical field
The present invention relates to the radio link control in the 3-G (Generation Three mobile communication system), relate to particularly that a kind of of data re-transmission mechanism improves one's methods under the affirmation pattern of this agreement.
Background technology
In the radio link control (RLC), RLC affirmation mode (AM) entity makes transmitting terminal obtain the accepting state of receiving terminal by receiving terminal to the mechanism of transmitting terminal condition report feedback, there is not correct data PDU (the Protocol Data Unit that receives for indication in the status report, protocol Data Unit), transmitting terminal need retransmit these PDU.In the Release of rlc protocol 6 versions, the triggering of receiving-end state report has three kinds of mechanism: the poll of 1) receiving transmitting terminal; 2) upper-layer configured detect the mechanism lose PDU; 3) upper-layer configured the mechanism of timed sending status report.The mechanism that blocked state report sends has only a kind of: upper-layer configured status report forbid timer.
There is not configuration status accounting to forbid timer for RLC AM receiving terminal entity, perhaps status report is forbidden under the relatively shorter situation of timer configuration, the triggering of receiving-end state report may be compared frequently, particularly when the poll density of transmitting terminal is bigger.In this case, lose or receive mistake in case data PDU takes place, will a plurality of status reports of continuous trigger, these status reports all indicate identical data PDU correctly not received.For example, receiving terminal finds that sequence number (SN) is 0 incorrect reception of data PDU, will trigger a status report, the notice transmitting terminal retransmits the data PDU of SN=0, and in several Transmission Time Intervals (TTI) afterwards, receiving terminal has all been received poll, then in each receives the TTI of poll, receiving terminal is status report all, indicates the data PDU of SN=0 to lose equally, correctly receives up to receiving terminal till the data PDU of the SN=0 that transmitting terminal retransmits.Because the time-delay of the loop in the mobile communication system (round-trip time, RTT) bigger, send the status report that first designation data PDU loses from receiving terminal, to this data PDU of receiving that transmitting terminal retransmits, middle through one long period, interior during this period of time receiving terminal may send a plurality of status reports, this PDU of repeatedly re-transmission of transmitting terminal correspondence, and its process is as shown in Figure 1.And in fact may only need once to retransmit, receiving terminal just can correctly be received this PDU, remaining re-transmission has all caused waste, has reduced the utilization ratio of valuable wireless bandwidth.On the other hand, if the transmission number of times of same data PDU has reached the maximum number of times of transmission (MaxDAT-1) of upper-layer configured, will cause that SDU (service data unit) abandons or the RESET process, causes unnecessary data to abandon.
Summary of the invention
Technical problem to be solved by this invention provides data retransmission method in a kind of radio link control, solves prior art under the more frequent situation of status report, the very fast bandwidth waste problem that causes that repeatedly retransmits of data PDU.
For achieving the above object, the invention provides data retransmission method in a kind of radio link control, its characteristics are, transmitting terminal sends the protocol Data Unit under the radio link control affirmation mode, and corresponding described data cell is provided with a timer, if transmitting terminal receives the incorrect status report that receives described data cell from receiving terminal, then transmitting terminal is put into retransmission buffer with described data cell, and whether the timer that detects described data cell correspondence in the retransmission buffer scheduling process is overtime, be then to send described data cell and start corresponding timer, otherwise wait for buffer scheduling next time.
Above-mentioned method, its characteristics are, if transmitting terminal receives the status report from the described data cell of correct reception of receiving terminal, then close the timer of described data cell correspondence and delete described data cell.
Above-mentioned method, its characteristics are, further comprise the steps:
Step 2 is provided with the timer of described data cell correspondence;
Step 3, if receive the status report of receiving terminal, indication has correctly received described data cell, then enters step 8, otherwise described data cell needs to retransmit, and enters step 4;
Step 4 is put into retransmission buffer with the described data cell that needs retransmit;
Step 5, retransmission buffer when scheduling, if described data cell still in retransmission buffer, whether the timer that detects described data cell correspondence overtime, is then to enter step 7, otherwise enters step 6;
Step 6, processing said data unit again when waiting for next time the retransmission buffer scheduling changes step 5 over to;
Step 7 sends to lower floor with described data cell, and the transmission of finishing described data cell starts the timer of described data cell correspondence afterwards, changes step 3 over to;
Step 8 is closed the timer of described data cell correspondence, waits for the described data cell of deletion.
Above-mentioned method, its characteristics are, in described step 2, the described timer that described data cell correspondence is set further comprises: judge whether described data cell is the normal for the first time data cell that sends, be then not start timer, if receive the status report of receiving terminal, indication has correctly received the described first time of the normal data cell that sends, then transmitting terminal is deleted described data cell, otherwise transmitting terminal sends described protocol Data Unit once more and starts timer.
Above-mentioned method, its characteristics are, decide the value of described timer two-way time according to the data between transmitting terminal and the receiving terminal.
Above-mentioned method, its characteristics are that the value of described timer equals described two-way time.
Technique effect of the present invention is:
The invention provides improving one's methods of a kind of RLC AM data PDU retransmission mechanism, reduced unnecessary data and retransmitted the bandwidth waste that causes, improved the utilization ratio of bandwidth, reduced simultaneously and caused that SDU abandons or the probability of RESET process.
Description of drawings
Fig. 1 is a RLC AM mode data retransmission mechanism present situation schematic diagram;
Fig. 2 is that RLC AM mode data provided by the invention retransmits the flow chart of improving one's methods.
Embodiment
Further describe specific embodiments of the invention below in conjunction with accompanying drawing.
The present invention has provided a kind of the improving one's methods of RLC AM data PDU retransmission mechanism, can solve under the more frequent situation of status report, and the very fast bandwidth waste problem that causes that repeatedly retransmits of data PDU reduces invalid number of retransmissions, improves the utilization ratio of bandwidth.
The concrete scheme of the present invention is as follows:
For certain RLC AM data PDU, be designated as PDU (i).After PDU (i) sends or retransmits to lower floor, PDU (i) is started a timer Timer_Retransmit_Prohibit, be designated as Timer_trp (i).If receive the status report of receiving terminal, indication PDU (i) is also incorrect to be received, and then transmitting terminal is put into retransmission buffer with PDU (i), waits for retransmitting.Whether when retransmission buffer is dispatched, it is overtime to detect the corresponding Timer_trp (i) of PDU (i), if do not have overtimely, then PDU (i) can not send to lower floor, waits for and handling when dispatching next time again.If after Timer_trp (i) is overtime, still in retransmission buffer, then when retransmission buffer was dispatched, PDU (i) can send to lower floor to PDU (i), after the transmission, started Timer_trp (i) once more.
Purpose for reducing the timer number can just start timer after PDU retransmits for the first time, do not start when PDU normally sends, and like this, the PDU that need not to retransmit for majority does not just need to start timer, can reduce the use of timer.
The value of Timer_Retransmit_Prohibit can equal or near the RTT size of (two-way time), but is not limited thereto.Illustrate, suppose that RTT is 140ms, the TTI of uplink transport channel (Transmission Time Interval) is 20ms, descending Poll (poll) compares comparatively dense, and descending receiving terminal does not have the configuration status bag to forbid mechanism, in case certain PDU loses like this, retransmits this PDU for the first time to receiving the ACK (affirmation) of receiving terminal to this PDU from transmitting terminal, between also can receive the status report of repeatedly indicating this PDU to lose, just need to retransmit about 7 times at least; If Timer_Retransmit_Prohibit is set to 140ms, then may only need once to retransmit; If Timer_Retransmit_Prohibit is set to 80ms, then may need twice re-transmission; The rest may be inferred.In addition, as can be seen, forbid timer if disposed the state bag, and its value is during greater than the value of Timer_Retransmit_Prohibit, then the state bag forbids that timer plays a major role.
Fig. 2 is that RLC AM mode data provided by the invention retransmits the flow chart of improving one's methods, and as shown in the figure, the concrete steps of the inventive method are as follows:
Step 210:RLC AM transmitting terminal entity sends or retransmits to lower floor with PDU (i);
Step 220: start the corresponding Timer_trp (i) of PDU (i);
Step 230: if receive the status report of receiving terminal, indication PDU (i) correctly receives, and then enters step 280, otherwise, enter step 240;
Step 240: when needing to retransmit PDU (i), PDU (i) is put into retransmission buffer;
Step 250: retransmission buffer when scheduling, if PDU (i) still in retransmission buffer, whether the Timer_trp (i) that detects PDU (i) overtime, if do not have overtimely, then enters step 260, otherwise, enter step 270;
Step 260:PDU (i) handles when waiting for retransmission buffer scheduling next time again, enters step 250;
Step 270: PDU (i) is sent to lower floor, promptly retransmit PDU (i), enter step 220 afterwards;
Step 280: timeing closing device Timer_trp (i), PDU (i) waits for deletion.
As from the foregoing, the invention provides improving one's methods of a kind of RLC AM data PDU retransmission mechanism, reduced unnecessary data and retransmitted the bandwidth waste that causes, improved the utilization ratio of bandwidth, reduced simultaneously and caused that SDU abandons or the probability of RESET process.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (6)
1, data retransmission method in a kind of radio link control, it is characterized in that, transmitting terminal sends the protocol Data Unit under the radio link control affirmation mode, and corresponding described data cell is provided with a timer, if transmitting terminal receives the incorrect status report that receives described data cell from receiving terminal, then transmitting terminal is put into retransmission buffer with described data cell, and whether the timer that detects described data cell correspondence in the retransmission buffer scheduling process is overtime, be then to send described data cell and start corresponding timer, otherwise wait for buffer scheduling next time.
2, method according to claim 1 is characterized in that, if transmitting terminal receives the status report from the described data cell of correct reception of receiving terminal, then closes the timer of described data cell correspondence and deletes described data cell.
3, method according to claim 1 and 2 is characterized in that, further comprises the steps:
Step 1, the transmitting terminal entity of radio link control affirmation mode sends to lower floor with protocol Data Unit;
Step 2 is provided with the timer of described data cell correspondence;
Step 3, if receive the status report of receiving terminal, indication has correctly received described data cell, then enters step 8, otherwise described data cell needs to retransmit, and enters step 4;
Step 4 is put into retransmission buffer with the described data cell that needs retransmit;
Step 5, retransmission buffer when scheduling, if described data cell still in retransmission buffer, whether the timer that detects described data cell correspondence overtime, is then to enter step 7, otherwise enters step 6;
Step 6, processing said data unit again when waiting for next time the retransmission buffer scheduling changes step 5 over to;
Step 7 sends to lower floor with described data cell, and the transmission of finishing described data cell starts the timer of described data cell correspondence afterwards, changes step 3 over to;
Step 8 is closed the timer of described data cell correspondence, waits for the described data cell of deletion.
4, method according to claim 3, it is characterized in that, in described step 2, the described timer that described data cell correspondence is set further comprises: judge whether described data cell is the normal for the first time data cell that sends, be then not start timer, if receive the status report of receiving terminal, indication has correctly received the described first time of the normal data cell that sends, then transmitting terminal is deleted described data cell, otherwise transmitting terminal sends described protocol Data Unit once more and starts timer.
5, method according to claim 3 is characterized in that, decides the value of described timer two-way time according to the data between transmitting terminal and the receiving terminal.
6, method according to claim 5 is characterized in that, the value of described timer equals described two-way time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610011804 CN101064663A (en) | 2006-04-27 | 2006-04-27 | Method for retransmitting data in wireless link control protocol |
| PCT/CN2006/003758 WO2007124634A1 (en) | 2006-04-27 | 2006-12-30 | A method for data retransmitting in the radio link control protocol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610011804 CN101064663A (en) | 2006-04-27 | 2006-04-27 | Method for retransmitting data in wireless link control protocol |
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| Publication Number | Publication Date |
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| CN101064663A true CN101064663A (en) | 2007-10-31 |
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| CN 200610011804 Pending CN101064663A (en) | 2006-04-27 | 2006-04-27 | Method for retransmitting data in wireless link control protocol |
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| WO (1) | WO2007124634A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009152726A1 (en) * | 2008-06-16 | 2009-12-23 | 华为技术有限公司 | Method and device for processing radio link control retransmission |
| CN101699782A (en) * | 2009-11-06 | 2010-04-28 | 中兴通讯股份有限公司 | Processing method and device of wireless link retransmitted data |
| CN101252424B (en) * | 2008-04-02 | 2011-10-05 | 中国科学院计算技术研究所 | System and method for processing PDU in automatic retransmission request mechanism |
| CN101753277B (en) * | 2008-12-16 | 2013-03-20 | 中兴通讯股份有限公司 | Method for transmitting message status report of radio link control layer |
| CN103763073A (en) * | 2014-01-09 | 2014-04-30 | 深圳市迪威视讯股份有限公司 | Method for retransmission of lost data packet and terminal |
| CN104184546A (en) * | 2013-05-27 | 2014-12-03 | 百度在线网络技术（北京）有限公司 | Method and system for reducing message retransmission in mobile communication network |
| CN104823504A (en) * | 2012-11-27 | 2015-08-05 | 高通股份有限公司 | Buffer size reporting in time division high speed uplink packet access (TD-HSUPA) systems |
| CN111543079A (en) * | 2018-01-08 | 2020-08-14 | 中兴通讯股份有限公司 | Radio Link Control (RLC) Acknowledged Mode (AM) data reception |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6629285B1 (en) * | 2000-01-04 | 2003-09-30 | Nokia Corporation | Data transmission |
| KR100876765B1 (en) * | 2002-05-10 | 2009-01-07 | 삼성전자주식회사 | Apparatus for retransmitting data in mobile communication system and method thereof |
| CN1165129C (en) * | 2002-05-16 | 2004-09-01 | 武汉汉网高技术有限公司 | ARQ mechanism able to automatically request retransmissions for multiple rejections |
| CN100337418C (en) * | 2004-03-12 | 2007-09-12 | 华为技术有限公司 | A method for triggering transmission of status information |
-
2006
- 2006-04-27 CN CN 200610011804 patent/CN101064663A/en active Pending
- 2006-12-30 WO PCT/CN2006/003758 patent/WO2007124634A1/en active Application Filing
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252424B (en) * | 2008-04-02 | 2011-10-05 | 中国科学院计算技术研究所 | System and method for processing PDU in automatic retransmission request mechanism |
| WO2009152726A1 (en) * | 2008-06-16 | 2009-12-23 | 华为技术有限公司 | Method and device for processing radio link control retransmission |
| CN101753277B (en) * | 2008-12-16 | 2013-03-20 | 中兴通讯股份有限公司 | Method for transmitting message status report of radio link control layer |
| CN101699782A (en) * | 2009-11-06 | 2010-04-28 | 中兴通讯股份有限公司 | Processing method and device of wireless link retransmitted data |
| CN101699782B (en) * | 2009-11-06 | 2013-05-01 | 中兴通讯股份有限公司 | Processing method and device of wireless link retransmitted data |
| CN104823504A (en) * | 2012-11-27 | 2015-08-05 | 高通股份有限公司 | Buffer size reporting in time division high speed uplink packet access (TD-HSUPA) systems |
| CN104184546A (en) * | 2013-05-27 | 2014-12-03 | 百度在线网络技术（北京）有限公司 | Method and system for reducing message retransmission in mobile communication network |
| CN104184546B (en) * | 2013-05-27 | 2019-04-02 | 百度在线网络技术（北京）有限公司 | The method and system of message retransmission are reduced in a kind of mobile communications network |
| CN103763073A (en) * | 2014-01-09 | 2014-04-30 | 深圳市迪威视讯股份有限公司 | Method for retransmission of lost data packet and terminal |
| CN111543079A (en) * | 2018-01-08 | 2020-08-14 | 中兴通讯股份有限公司 | Radio Link Control (RLC) Acknowledged Mode (AM) data reception |
| CN111543079B (en) * | 2018-01-08 | 2022-04-15 | 中兴通讯股份有限公司 | Radio Link Control (RLC) Acknowledged Mode (AM) data reception |
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| Publication number | Publication date |
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| WO2007124634A1 (en) | 2007-11-08 |
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