CN101030839A - Method for re-transmitting data - Google Patents
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- CN101030839A CN101030839A CN 200710073312 CN200710073312A CN101030839A CN 101030839 A CN101030839 A CN 101030839A CN 200710073312 CN200710073312 CN 200710073312 CN 200710073312 A CN200710073312 A CN 200710073312A CN 101030839 A CN101030839 A CN 101030839A
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Abstract
The method comprises: if the receiving side detects the currently-received maximum series number RLC PDU is not the last RLC PDU of currently-received SDU, it starts a preset timer; when the timer is overtime, it the receiving side receives the next RLC PDU, then returning to step A; otherwise, before the time is overtime, if the receiving side doesn't receive next RLC PDU, then the receiving side decides the packet loss happens, and sends the status report to the sending side; after receiving the status report, the sending side re-transmits the lost data according to the status report.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to the transfer of data in the wireless communication field.
Background technology
In wireless communication field, radio bearer RB (Radio Bear) is business (Traffic) carrying and signaling (Signal) carrying between user equipment (UE) (UserEquipment) and the radio network controller (RNC) (Radio Network Controller), according to its loaded service type, custom is referred to as TRB (Traffic RB) and SRB (Signal RB).SRB is different from TRB, SRB has relatively high expectations to time delay, in other words upward propagation delay time is low more good more for SRB, and generally speaking, in order to guarantee the correct transmission of signaling, SRB can adopt Unacknowledged Mode UM (Unacknowledged Mode) or affirmation mode AM (Acknowledged Mode), and in current various realizations, SRB mainly also is to use the AM pattern.
Radio Link control RLC (Radio Link Controll) sublayer is after receiving the high-rise SDU of service data unit (Service Data Unit) that higher level protocol suite is come, meeting is carried out cascade or staged operation according to the size decision of the protocol Data Unit PDU (Protocol Data Unit) that size and the RLC sublayer of high-rise SDU itself are supported to described high-rise SDU, be specially: if high-rise SDU is big and surpassed a maximum that RLC PDU can hold, then the RLC sublayer is positioned over its segmentation among some RLC PDU; If a RLC PDU is enough to place a high-rise SDU who descends from high level, then need not segmentation, if even a plurality of high-rise SDU just can fill a RLC PDU, then with these several high-rise SDU cascades and insert among the RLCPDU.
Under the AM pattern, realize reliable, the correct transmission of data by retransmit, sliding window mechanism etc.Detailed process is as follows: can send a poll (POLL) behind the every transmission plurality of data of transmit leg to the data receiver, and polling purpose is in order to notify the recipient to feed back an explanation about the situation of correcting errors of the data received for the previous period; Feedback for the data that receive, the recipient is by finishing to transmit leg status report (STATUSREPORT), and the status report that transmit leg sends according to the recipient learns which data has correctly been received and which data receiver does not receive that needs retransmit.In this process, the triggering of the POLL process of transmit leg has multiple mode, mainly comprises following several:
1): when also being left " last PDU " in the transmission buffering of transmit leg, transmit leg will trigger the situation that POLL notifies recipient's feedback data to receive, and described " last PDU " mainly is divided into following two kinds of situations:
Only remaining last RLC PDU needed to send during A, current time sent and cushion, and then when this RLC PDU sent, RLC can be 1 with the POLL bit position among this RLC PDU, thereby triggers a POLL process;
B, current send window are at once full, and the RLC PDU to be sent in the current transmission buffering is allowed last RLC PDU of sending by current send window;
2): when also being left " last PDU " in the re-transmission buffering of transmit leg, transmit leg will trigger the situation that POLL notifies recipient's feedback data to receive, and described " last PDU " mainly is divided into following two kinds of situations:
Only remaining last RLC PDU needed to retransmit during A, current time retransmitted and cushion, and then when this RLC PDU retransmitted, RLC can be 1 with the POLL bit position among this RLC PDU, thereby triggers a POLL process;
B, current send window are at once full, because the RLC PDU that retransmits equally also will take send window, and the transmission priority that retransmits RLC PDU will be higher than the priority level of the RLC PDU that sends first, and the RLC PDU to be sent in the current re-transmission buffering is allowed last RLC PDU of sending by current send window;
3): set in advance the size of POLL PDU, behind PDU RLC PDU of the every transmission of transmit leg POLL, just trigger the POLL process, for example POLL PDU is configured to 16, then just trigger the POLL process behind 16 RLC PDU of the every transmission of transmit leg;
4): set in advance the size of the high-rise SDU of POLL, just trigger the POLL flow process behind high-rise SDU the high-rise SDU of the every transmission of transmit leg POLL, the high-rise SDU of general POLL is configured to 1, then just triggers the POLL process behind 1 high-rise SDU of the every transmission of transmit leg;
5): set in advance a timer, then can come the triggering POLL process of cycle row by described timer.
Be not difficult to find out, it is the basis that the triggering of POLL process needs the regular hour, no matter be to send RLC PDU in the buffering by the time to have distributed and do not receive ACK as yet, or the overtime triggering of waiting timer POLL process, in other words, the triggering of transmit leg POLL process itself needs a time course.And by foregoing description as can be seen, the complete transmission that will carry out data under the AM pattern needs transmit leg and recipient affirmation repeatedly, therefore can be by very big influence to the efficient of transfer of data.
Can see from top process, after in the transmission course packet loss taking place under the AM pattern, if transmit leg has disposed POLL, then under the situation that trigger condition satisfies, trigger the POLL process to recipient's status report from transmit leg, arrive transmit leg again and retransmit, the time span that this process continued may require high signaling to produce negative influence to real-time.With respect to TRB, the real-time of SRB, it is high many that accuracy requirement is all wanted: imagine certain user when attempting setting up call business, the high-rise SDU of certain signaling need be divided into 4 PDU and send, be that SN is respectively x, x+1, x+2, x+3 does not receive if last SN is the PDU recipient of x+3, though then the recipient has received first three PDU, but cause in the entity of opposite end owing to still lacking last PDU, PDU can't finish reorganization, also just can't transmit corresponding high-rise SDU to high level, meanwhile, in order to obtain the PDU that is lost again, both sides' cooperation of having to once retransmit.At first transmit leg triggers the POLL process, for this POLL process, transmit leg need be paid the regular hour cost, Cai structural state reported to transmit leg after the recipient received POLL.The time delay that the process of this re-transmission is brought has a strong impact on professional quality sometimes even causes professional unavailable.
Summary of the invention
Embodiments of the invention propose a kind of data retransmission method, are used to solve the bigger problem of data re-transmission time delay that causes because the recipient triggers the POLL process, reduce the time delay that data re-transmission is brought under the AM pattern greatly, improve professional quality.This method is specific as follows described:
If during last RLC PDU that it is not the current SDU that is receiving that the recipient detects the current maximum sequence number RLC PDU that has received, start predefined timer; Before described timer expiry,, then return steps A if the recipient has received next RLC PDU; Otherwise if the recipient does not receive next RLC PDU, then packet loss appears in recipient's judgement in transmission course, to the transmit leg status report before described timer expiry; After transmit leg is received described status report, resend the data of having lost according to status report.
By scheme described above, can know in the technical scheme of the embodiment of the invention, the recipient understands the situation whether packet loss takes place in the active detecting transmission course, after the recipient has detected packet loss just initiatively to the transmit leg status report, with respect to prior art, the recipient detects after with regard to the POLL that can not wait until transmit leg again and to the transmit leg status report again, like this, just stopped the time delay that the POLL process is brought, improve professional quality, improved user's satisfaction.
Description of drawings
The flow control sliding window mechanism schematic diagram of Fig. 1 protocol definition;
Fig. 2 is the flow chart according to an embodiment of the principle of the invention.
Embodiment
When the recipient detects the situation that packet loss is arranged in the data that received, initiatively to the transmit leg status report, and need not wait until that transmit leg triggers the POLL process, so just, shortened original because the extra time-delay that the POLL process of transmit leg is brought, guaranteed especially not have too big time-delay in the signaling transmission course in the whole data transmission procedure, guarantee professional QoS, improved user satisfaction.
Before the embodiment of the invention is elaborated, at first introduce the sliding window mechanism of flow control, specifically as shown in Figure 1:
In Fig. 1, VT (A), VT (S), VT (MS), VR (R), VR (H) and VR (MR) are the state variable of protocol definition.
In the send window of transmit leg, VT (A) is the size of send window to the length between the VT (MS), the quantity of the RLC PDU of unit; VT (A) before in order the side of being sent out confirm the RLC PDU of correct reception; VT (A) between the VT (S) for having sent at least once but also do not receive the RLC PDU of the correct receiving state report of recipient; VT (S) is to the RLC PDU for allowing to send between the VT (MS).When if transmit leg has new RLC PDU to send, VT (S) moves backward; If transmit leg determines that by recipient's status report sequence number is the RLC PDU of VT (A) when correctly having been received, VT (A) moves backward, and VT (MS) also correspondingly moves backward.
In recipient's receive window, VR (R) is the size of receive window to the length between the VR (MR), and unit is the quantity of RLC PDU; VR (R) is the RLC PDU that correctly receives before; VR (R) is to the RLC PDU for allowing to receive between the VR (MR).If the recipient receives sequence number when being the RLC PDU of VR (H) between VR (MR), VR (H) moves backward; If the recipient receives sequence number when being the RLC PDU of VR (R), VR (R) moves backward, and VR (MR) also correspondingly moves backward.The VR of recipient's receive window (R), VR (H) and VR (MR) are the state variable of protocol definition, and wherein, VR (R) is the sequence number of the RLC PDU of the current expectation reception of recipient, and VR (R) is the RLC PDU that correctly receives before.
Transmit leg RLC sublayer is after receiving the high-rise SDU that high level sends, can carry out cascade or staged operation to described high-rise SDU according to the RLC PDU size of size of high-rise SDU own and the support of RLC sublayer, in the form of RLC PDU, agreement has been stipulated a Length Indication field LI (Length Indicator), and this field can only appear at the latter end of a high-rise SDU in RLC PDU inside.Specifically divide such two kinds of situations:
(1) if high-rise SDU is carried out staged operation, suppose that this high level SDU is segmented into n RLCPDU, then sequence number is not have the LI field among 0 to n-2 number the RLC PDU that belongs to this high level SDU, and having only in the end a RLC PDU who belongs to this high level SDU is that sequence number is to have the LI field among the RLC PDU of n-1;
(2) if high-rise SDU is carried out cascade operation, even comprised one or more high-rise SDU among certain RLC PDU, then all can there be a LI field at the end of each high-rise SDU in this RLC PDU.
Based on the above, the embodiment of the invention has proposed a kind of scheme that detects packet loss and has also carried out data retransmission method on this basis, and this method is specific as follows:
When the recipient detects the data that received, the recipient detects the RLC PDU of the sequence number maximum that received, in actual applications, because the recipient upgrades the asynchronism(-nization) of VR (H), so, the maximum sequence number RLC PDU of the current reception of recipient can be VR (H), also can be VR (H)-1, when upgrading VR (H) again after finishing dealing with as the RLC PDU that each is received as the recipient, the maximum sequence number RLC PDU of the current reception of recipient is VR (H), when upgrading VR (H) before the RLCPDU processing that the recipient is receiving each, then the maximum sequence number RLC PDU of the current reception of recipient is VR (H)-1.
Whether the RLC PDU that judges this maximum sequence number is last RLCPDU of the current SDU that is receiving, whether the RLC PDU that promptly checks described maximum sequence number comprises the LI field, if comprise last RLC PDU that the LI field then is the current SDU that is receiving, if do not comprise the LI field, then the RLC PDU of this maximum sequence number is not last RLC PDU of the current SDU that is receiving.
If judge the RLC PDU of the described current maximum sequence number that has received and be not last RLC PDU of the SDU that is receiving and in specific a period of time after this recipient also do not receive next RLC PDU, then judge in this transmission course packet drop to occur; When recipient's judgement packet loss occurred, the recipient initiatively encapsulated a status report (STATUS REPORT) and it is issued transmit leg, and then transmit leg retransmits the data of having lost according to described status report to the recipient.
If the recipient received next RLC PDU in described specific a period of time, then repeat above-mentioned steps, judge described next RLC PDU is whether the RLC PDU of new maximum sequence number is last RLC PDU of the current SDU that is receiving; If process ends then.
Here, described specific a period of time be the expression recipient receptible two maximum delay between continuously should received RLC PDU, if the recipient does not also receive next RLC PDU in described specific a period of time behind a certain RLC PDU that receives, then the recipient just is judged to be the situation that has occurred packet loss in the transmission course.Described this specific a period of time can preestablish.
This shows, in the scheme of the embodiment of the invention, the recipient is not that transmit leg is sent out status report after triggering the POLL process more by the time, but after judging packet drop to have occurred, the recipient then initiatively sends out status report to transmit leg, transmit leg just retransmits the data of having lost after receiving described status report, so just stop the time delay that the POLL process is brought, improved professional quality, improved user's satisfaction.
Here, described recipient can be RNC, and transmit leg can be UE; Certainly, the recipient also can be UE, and transmit leg can be RNC.
Below, be UE with the transmit leg, the recipient is an example for RNC, describes embodiments of the present invention in detail, as shown in Figure 2, its step is as follows:
Step S20, RNC judge that whether the RLC PDU of the current maximum sequence number that receives is last RLC PDU of the SDU that receiving.
In certain this data transmission procedure, UE sends data to RNC, RNC receives described data from UE, RNC detects described data in receiving course, in the present embodiment, RNC judges that whether the RLC PDU of maximum sequence number in the current data that receive is last RLCPDU of the SDU that receiving; As mentioned above, the RLC PDU of described sequence number maximum can be that sequence number is the RLCPDU of VR (H)-1, also can be that sequence number is the RLC PDU of VR (H); RNC checks whether the RLC PDU of described sequence number maximum comprises the LI field, if comprise the LI field then it be last RLCPDU of the current SDU that is receiving, if do not comprise, and this RLC PDU last RLC PDU that is not the current SDU that is receiving then.
Step S21, if it is not last RLC PDU of the SDU that receiving that RNC judges the RLC PDU of the current maximum sequence number that receives, then start predefined timer.
In the present embodiment, with this timer called after Timer_Segment_Interval_Margin, the cycle of this timer can be configured according to the actual transmissions situation by high-rise (RRC), be that RRC is configured under different transmitting scenes, in the hope of reaching the highest efficiency of transmission, user's time delay impression is least obvious; Here dispose described timer cycle can by at high level with the message between the RLC sublayer such as transmission configuration message or retransmit and add new IE in the configuration messages and realize, promptly high-rise cycle information with described timer is encapsulated into transmission configuration message or retransmits in the configuration messages and with described transmission configuration message or retransmitting configuration messages is issued to the RLC sublayer, and the RLC sublayer is according to described transmission configuration message or retransmit the cycle that the timer cycle information in the configuration messages disposes described timer.Certainly, also can be that timer of new settings is provided with message, then high-rise and after configuring timer cycle, can message be set described timer cycle information is issued the RLC sublayer by described timer.
Step S22, in the timing cycle of described timer, if RNC received next RLC PDU, then return step S20; If the recipient does not also receive next RLCPDU, then execution in step S23 in described timer expiry.
If in the timing cycle of described timer, RNC has received next RLC PDU, then go back to step S20, repeat said process, RNC judges the described next RLC PDU that receives is whether new maximum sequence number RLC PDU is last RLC PDU of the current SDU that is receiving, if then close described timer, process ends; Otherwise enter step S21, restart described timer.
If RNC does not also receive next RLC PDU in described timer expiry, then the recipient judges the current situation that packet loss occurred, enters step S23; If in timer cycle, received next RLC PDU, then return step S20, so repeat.
Step S23, RNC are to the UE status report.
After RNC judges the current situation that packet loss occurred, initiatively encapsulate a status report and it is issued UE.
Step S24, UE retransmit obliterated data.
UE is known the data of having lost and is sent the data of having lost to RNC again according to described status report after receiving the status report that RNC sends over.
The data of the transmit leg described in the embodiment of the invention and recipient's transmission both can be that business datum also can be a signaling, in actual applications, especially for the signaling of transmitting between transmit leg and the recipient, the retransmission scheme that the embodiment of the invention proposes has been stopped the time delay that the POLL process is brought, guarantee the time delay minimum of signaling transmission, guarantee QoS of survice, improved professional quality, improved user's satisfaction.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect have been carried out further detailed description; institute is understood that; the above only is specific embodiments of the invention; not in order to restriction the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1, a kind of data retransmission method is characterized in that, comprising:
A, if during recipient last RLC PDU that to detect the current maximum sequence number RLC PDU that has received be not the current SDU that is receiving, start predefined timer;
B, before described timer expiry, if the recipient received next RLC PDU, then return steps A; Otherwise if the recipient does not receive next RLC PDU, then packet loss appears in recipient's judgement in transmission course, to the transmit leg status report before described timer expiry;
After C, transmit leg are received described status report, resend the data of having lost according to status report.
2, the method for claim 1 is characterized in that, described maximum sequence number RLC PDU is that sequence number is the RLC PDU of VR (H).
3, the method for claim 1 is characterized in that, described maximum sequence number RLC PDU is that sequence number is the RLC PDU of VR (H)-1.
4, the method for claim 1 is characterized in that, last RLC PDU that it is not the current SDU that is receiving that described recipient detects the current maximum sequence number RLC PDU that has received is specially:
The recipient detects the described current maximum sequence number RLC PDU that has received and whether comprises Length Indication LI field, if comprise last the RLC PDU that judges that then the current maximum sequence number RLC PDU that has received is the current SDU that is receiving; Otherwise, judge last RLC PDU that the current maximum sequence number RLC PDU that has received is not the current SDU that is receiving.
5, the method for claim 1, it is characterized in that, the described timer that preestablishes is specially: after recipient's high level configures described timer cycle information, the timer cycle information-bearing that configures is passed to recipient RLC sublayer in transmission configuration message or re-transmission configuration messages.
6, the method for claim 1 is characterized in that, the described timer that preestablishes is specially:
After recipient's high level configures described timer cycle information, the timer cycle information-bearing that configures is passed to recipient RLC sublayer in the message of new settings.
As arbitrary described method in the claim 1 to 6, it is characterized in that 7, described recipient is that RNC, transmit leg are UE; Or
Described recipient is that UE, transmit leg are RNC.
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| CN 200710073312 CN101030839A (en) | 2007-02-13 | 2007-02-13 | Method for re-transmitting data |
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| CN 200710073312 CN101030839A (en) | 2007-02-13 | 2007-02-13 | Method for re-transmitting data |
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| CN101841856A (en) * | 2010-04-12 | 2010-09-22 | 展讯通信（上海）有限公司 | Transmitting method and receiving terminal for state report of protocol data unit receiving situation |
| CN101222311B (en) * | 2008-01-29 | 2010-12-08 | 杭州华三通信技术有限公司 | Real-time packet loss recovery method, system and receiving terminal unit |
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