CN101202610A - Retransmission control method in a wireless link controlling body - Google Patents
Retransmission control method in a wireless link controlling body Download PDFInfo
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- CN101202610A CN101202610A CNA2007101796155A CN200710179615A CN101202610A CN 101202610 A CN101202610 A CN 101202610A CN A2007101796155 A CNA2007101796155 A CN A2007101796155A CN 200710179615 A CN200710179615 A CN 200710179615A CN 101202610 A CN101202610 A CN 101202610A
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Abstract
The invention discloses a retransmission control method in a RLC. In the invention, a transmitting terminal records the last time transmitting time on each AMD PDU; only when the current time is spaced by a certain length with the last time transmission time on the AMD PDU, the AMD PDU can be allowed to be retransmitted, while the AMD PDU is not preferentially transmitted or retransmitted under any situation; thereby ensuring that the transmitting terminal can not continuously retransmit the retransmission AMD PDU under the situation that the retransmission AMD PDU can reach a receiving terminal, thus even if a receiving window of the receiving terminal is larger, the receiving terminal can not generate error response caused by the circulating shift of the receiving terminal, thereby being capable of reducing the RLC reduction probability of the receiving terminal, thus avoiding the mutation of data transmission speed and improving the reliability of data transmission.
Description
Technical field
The present invention relates to the data transmission technology in the mobile communication, the re-transmission controlling method in particularly a kind of radio link control entity (RLC).
Background technology
In the data transmission procedure based on answer-mode (AM) between RLC, transmitting terminal sends the protocol Data Unit (AMD PDU) of answer-mode to receiving terminal, and whether receiving terminal can successfully receive AMD PDU to the transmitting terminal response, makes transmitting terminal can determine whether to need to retransmit this AMD PDU.
Specifically, as each AMD PDU that the RLC of transmitting terminal sends in proper order, the corresponding sequence number (SN) that has serial number respectively is when SN reaches default SN higher limit, the numbering of SN promptly begins the numbering of next cycle period again from default SN lower limit.
Disposed a receive window among the RLC as receiving terminal, if the SN of the AMDPDU that receiving terminal receives drops in the receive window, promptly the value of this SN then determines correctly to have received this AMP PDU and response to transmitting terminal between the window head value and window tail-end value of receive window; If the SN of the AMD PDU that receiving terminal receives drops on outside the receive window, then abandon this AMD PDU; If the receiving terminal not pairing AMD PDU of certain SN in the receive window and SN is correctly received greater than other AMD PDU of this AMD PDU, then receiving terminal judges that the AMD PDU of this SN correspondence is not correctly received and responds to transmitting terminal.
Wherein, along with receiving terminal constantly correctly receives AMD PDU, receive window also can move to right thereupon, and promptly window head value all increases identical numerical value with the window tail-end value; When the window tail-end value of receive window has reached default SN higher limit, then when moved to right next time, the window tail-end value became default SN lower limit, promptly realized the ring shift right of receive window.At this moment, the SN of the AMD PDU that transmitting terminal sends promptly begins the numbering cycle of following one-period also from this SN lower limit open numbering.
Transmitting terminal retransmits corresponding AMD PDU after receiving the response that expression AMD PDU correctly do not received, this SN that retransmits AMD PDU is constant.Wherein, sending distolaterally, needing the AMD PDU that retransmits to have higher transmission priority, after having only all PDU that need retransmit to send to finish, could continue the common AMD PDU of transmission than common AMD PDU.
Aforesaid way can realize transmitting terminal is retransmitted the control of AMDPDU based on the response of receiving terminal to transmitting terminal.But,, thereby can cause transmitting terminal to retransmit same AMD PDU continuously because this mode reckons without the loop return time of rlc layer and AMD PDU that all need retransmit all is higher than common AMD PDU in the transmission priority of transmitting terminal.In this case, if the receive window of receiving terminal is bigger, for example at the receive window of high speed business greater than 2048, then can be owing to the receive window ring shift right makes receiving terminal send wrong response to transmitting terminal, thus make the RLC as transmitting terminal reset.
Fig. 1 is the schematic diagram of continuous retransmission processes.Fig. 2 a～Fig. 2 c is the view of receive window in the continuous retransmission processes, the receive window size of supposing receiving terminal is 3000, the SN lower limit is 0, the SN higher limit is 4095, the rectangle frame that grid is filled in the receive window of receiving terminal represents that the AMD PDU that correctly do not received, the rectangle frame of solid filling represent the AMD PDU that has correctly been received.
1, as shown in Figure 1, to send SN in the current cycle period for the first time be that this AMD PDU fails to transfer to receiving terminal behind 1095 the AMDPDU to transmitting terminal.At this moment, referring to Fig. 2 a, the window head value of receive window is 1095, the window tail-end value is 4095, and SN is that 1095,4000,4095 AMD PDU is not all correctly received in the current cycle period.
Thereby receiving terminal responds a STATUS PDU to transmitting terminal, represent that SN in the current cycle period is 1095 the AMD PDU reception that fails, and the receive window state shown in Fig. 2 a remains unchanged.
2, receive this STATUS PDU after be higher than common AMD PDU owing to retransmit the transmission priority of AMD PDU, transmitting terminal suspends the common AMD PDU of current transmission, and to retransmit SN in the current cycle period immediately be this AMD PDU of 1095.SN is in the transmission course of 1095 AMD PDU in current cycle period, receiving terminal still fails correctly to receive this AMD PDU, thereby, represent this AMD PDU reception that fails, and the receive window shown in Fig. 2 a does not move to right still to transmitting terminal secondary response one STATUS PDU again.
3, to receive the SN that is retransmitted by transmitting terminal for the first time be 1095 re-transmission AMD PDU to receiving terminal, because SN is that 1095 AMD PDU is received in the current cycle period, thereby referring to Fig. 2 b, after the window tail-end value reached default SN higher limit 4000 when receive window moved to right, begin the ring shift right of following one-period from default SN lower limit, the window head value after moving to right is 4000, the window tail-end value is 2905.And in this process, after receiving STATUS PDU once more, be higher than common AMD PDU owing to retransmit the transmission priority of AMD PDU, thereby transmitting terminal suspends the common AMD PDU of current transmission once more, and to retransmit SN in the current cycle period once more immediately be 1095 AMD PDU.
4, to receive SN once more be 1095 AMD PDU to receiving terminal, but since its receive window ring shift right to next cycle period, therefore, 1095 the AMD PDU that receiving terminal thinks that the AMD PDU that this time receives is that SN is in the next cycle period, the receive window of this moment is referring to Fig. 2 c.Thereby receiving terminal can respond STATUS PDU to transmitting terminal, represents that SN in next cycle period is that 0～1094 AMD PDU all fails correctly to receive, SN is that 1095 AMDPDU is correctly received in next cycle period.
5, because transmitting terminal does not also send SN in next cycle period is 0～1095 AMD PDU, therefore after receiving that expression SN is that 0～1094 AMD PDU all fails correctly to receive, SN be the STATUS PDU that correctly received of 1095 AMD PDU in next cycle period, its internal state variable is upgraded and is made mistakes, thereby causes transmitting terminal to reset.
As seen, because existing RLC as transmitting terminal is when determining to retransmit and reckon without the loop return time of rlc layer, its transmission priority that retransmits AMD PDU under any circumstance all is higher than common AMD PDU, thereby when the receive window of receiving terminal is big, can cause it to reset, thereby in reseting procedure, can lose packet from the upper strata, and can't realize the transmission of data in the reseting procedure, make the speed of transfer of data to undergo mutation, reliability is lower.
Summary of the invention
In view of this, the invention provides the re-transmission controlling method among a kind of RLC, can reduce the probability that RLC resets, avoid the sudden change of message transmission rate, thereby improve reliability of data transmission.
Re-transmission controlling method among a kind of RLC provided by the invention comprises:
After the response that receives receiving terminal, judge the interval of the last delivery time of the AMD PDU that current time and receiving terminal fail correctly to receive, whether greater than the default time interval;
If suspend the AMD PDU of current transmission, and retransmit the AMD PDU that receiving terminal fails correctly to receive;
Otherwise, continue the transmission of current AMD PDU.
Described Preset Time interval is more than or equal to the loop return time of rlc layer.
The loop return time of described rlc layer is 80ms～100ms.
When sending each AMD PDU, this method further comprises:
Write down the delivery time of this AMD PDU.
This shows, write down the last delivery time of each AMD PDU among the present invention by transmitting terminal, only on current time and AMD PDU once delivery time at interval during certain length, just allow to retransmit this AMD PDU, rather than under any circumstance all preferential the transmission retransmits AMD PDU, thereby guarantee that transmitting terminal can not arrive under the situation of receiving terminal at re-transmission AMD PDU, retransmits this re-transmission AMD PDU continuously.Like this, even if the receive window of receiving terminal is bigger, can be owing to its cyclic shift not produce wrong response yet, thus can reduce RLC as the transmitting terminal probability that resets, thereby avoided the sudden change of message transmission rate, improved reliability of data transmission.
Description of drawings
Fig. 1 is the schematic diagram of continuous retransmission processes.
Fig. 2 a～Fig. 2 c is the view of receive window in the continuous retransmission processes.
Fig. 3 is a RLC structure of models schematic diagram.
Fig. 4 is the schematic flow sheet of re-transmission controlling method among the RLC of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
It is the response of receiving that continuously receiving terminal indicates this AMDPDU not receive that transmitting terminal sends the condition that retransmits AMD PDU continuously, and may there be following two kinds of situations in receiving terminal when indicating this response: one is exactly that the re-transmission AMD PDU that sends of transmitting terminal is in transmission, just owing to the delay in transmission course makes receiving terminal not receive as yet; It two is exactly that the re-transmission AMD PDU that sends of transmitting terminal fails to be sent to receiving terminal really.For latter event, obviously re-transmission can not cause resetting as the RLC of transmitting terminal; And for the previous case, will take place to reset as the RLC of transmitting terminal.
Therefore, in the present invention, receiving terminal retransmits same re-transmission AMD PDU continuously under the previous case, write down the last delivery time of each AMD PDU by transmitting terminal, only on current time and AMD PDU once delivery time at interval during certain length, just allow to retransmit this AMD PDU, rather than under any circumstance all preferential the transmission retransmits AMD PDU, thereby guarantee that transmitting terminal can not arrive under the situation of receiving terminal at re-transmission AMD PDU, retransmits this re-transmission AMD PDU continuously.Like this, even if the receive window of receiving terminal is bigger, can be owing to its cyclic shift not produce wrong response yet, thus can reduce RLC as the transmitting terminal probability that resets, thereby avoided the sudden change of message transmission rate, improved reliability of data transmission.
Fig. 3 is a RLC structure of models schematic diagram.As shown in Figure 3, the RLC as transmitting terminal realizes that by the transmitter side in left side data send.
1, the transmitter side of transmitting terminal constitutes AMD PDU after the packet to be sent on upper strata is cut apart/connected (Segmentation/Concatenation) processing and adds the RLC head; Then, AMD PDU is sent to Multiplexing Unit (MUX), be buffered in simultaneously and retransmit buffering and administrative unit (Retransmission Buffer﹠amp; Management Unit), and writes down the delivery time T1 of each AMD PDU, so that when receiving terminal does not successfully receive, can retransmit this AMD PDU; Multiplexing Unit is according to the indication of RLC control unit, AMD PDU that selection directly receives or the AMD PDU that retransmits in buffering and the administrative unit are sent to transmission buffer (Transmission Buffer), i.e. common AMD PDU that selection transmission is new or selection retransmit the re-transmission AMDPDU in buffering and the administrative unit; AMD PDU in the transmission buffer can be sent to receiving terminal after follow-up respective handling.
Whether receiving terminal meeting basis successfully receives AMD PDU and responds to transmitting terminal.Specifically, receiving terminal comprises RLC SUFI information in the response of transmitting terminal.
2,, after the receiver side of transmitting terminal receives response, determine the AMD PDU that all need retransmit according to RLCSUFI information, and obtain current time referring to the receiver side on Fig. 3 right side.
3, the receiver side of transmitting terminal is judged the time interval between the delivery time T1 of current time T2 and the AMD PDU that each need retransmit successively, whether greater than default time interval T0, if, then according to this RLC SUFI information updating state variable, and the corresponding A MD PDU that is buffered in re-transmission buffering and the administrative unit by the Multiplexing Unit selection resends, simultaneously, deletion retransmits to be received in buffering and the administrative unit and holds the AMD PDU that successfully receives; Otherwise, continue in the manner described above to judge whether the next AMD PDU that retransmits in buffering and the administrative unit retransmits.
Fig. 4 is the schematic flow sheet of re-transmission controlling method among the RLC of the present invention.As shown in Figure 4, this method comprises:
Step 400, transmitting terminal write down the delivery time of each AMD PDU when sending AMD PDU.
In this step, the default time interval is to determine according to the loop return time of rlc layer, and for example more than or equal to the loop return time of rlc layer, the loop return time of rlc layer is generally 80ms～100ms to Preset Time at interval.
If receiving terminal is a plurality of by responding its represented AMD PDU that fails correctly to receive, then this steps in sequence is judged the interval of the last delivery time of current time and each AMD PDU, whether greater than the default time interval, if, then execution in step 402, otherwise, continue to carry out this step the AMD PDU that next receiving terminal does not correctly receive is judged, if finished the judgement of the AMD PDU that all receiving terminals correctly do not receive, execution in step 403 again.
Wherein, the common AMD PDU described in the present invention is meant the normal for the first time AMDPDU that sends, and described " common " only is in order to be different from " re-transmission ".
So far, this flow process finishes.
Below, be example still with the described scene of background technology part, technical scheme of the present invention is illustrated.
1, still referring to Fig. 1, suppose transmitting terminal send for the first time in the current cycle period SN be 1095 AMD PDU and write down the delivery time T1 of this AMD PDU after, this AMD PDU fails to transfer to receiving terminal.At this moment, referring to Fig. 2 a, the window head value of receive window is 1095, the window tail-end value is 4095, and SN is that 1095,4000,4095 AMD PDU is not all correctly received in the current cycle period.
Thereby receiving terminal responds a STATUS PDU to transmitting terminal, represent that SN in the current cycle period is 1095 the AMD PDU reception that fails, and the receive window state shown in Fig. 2 a remains unchanged.
2, receive this STATUS PDU after, transmitting terminal judge between the delivery time T1 that current time T2 and SN are 1095 AMD PDU interval greater than default time interval T0, therefore, transmitting terminal suspends the common AMD PDU of current transmission, and to retransmit SN in the current cycle period immediately be this AMD PDU of 1095.SN is in the transmission course of 1095 AMD PDU in current cycle period, receiving terminal still fails correctly to receive this AMD PDU, thereby, represent this AMD PDU reception that fails, and the receive window shown in Fig. 2 a does not move to right still to transmitting terminal secondary response one STATUS PDU again.
3, to receive in the transmission course SN that takes place to postpone for the first time be 1095 re-transmission AMDPDU to receiving terminal, because SN is that 1095 AMD PDU is received in the current cycle period, thereby referring to Fig. 2 b, after the window tail-end value reached default SN higher limit 4000 when receive window moved to right, begin the ring shift right of following one-period from default SN lower limit, the window head value after moving to right is 4000, the window tail-end value is 2905.
And in this process, transmitting terminal receives STATUS PDU once more, and judge time interval between the delivery time T1 that current time T2 and SN are 1095 AMD PDU less than default time interval T0, thereby transmitting terminal continues the common AMD PDU of current transmission, is 1095 AMD PDU and can not retransmit SN once more.
Like this, the AMD PDU that receiving terminal can not retransmit transmitting terminal for the second time thinks it is that SN is 1095 AMD PDU in the next cycle period by mistake, thereby can not send wrong response, thereby has avoided resetting as the RLC of transmitting terminal.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the state information processing method among the RLC is characterized in that this method comprises:
After the response that receives receiving terminal, judge the interval of the last delivery time of the AMDPDU that current time and receiving terminal fail correctly to receive, whether greater than the default time interval;
If suspend the AMD PDU of current transmission, and retransmit the AMDPDU that receiving terminal fails correctly to receive;
Otherwise, continue the transmission of current AMD PDU.
2. the method for claim 1 is characterized in that, described Preset Time interval is more than or equal to the loop return time of rlc layer.
3. method as claimed in claim 2 is characterized in that, the loop return time of described rlc layer is 80ms～100ms.
4. as any described method in the claim 1 to 3, it is characterized in that when sending each AMD PDU, this method further comprises:
Write down the delivery time of this AMD PDU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101796155A CN101202610A (en) | 2007-12-14 | 2007-12-14 | Retransmission control method in a wireless link controlling body |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101796155A CN101202610A (en) | 2007-12-14 | 2007-12-14 | Retransmission control method in a wireless link controlling body |
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| CN101202610A true CN101202610A (en) | 2008-06-18 |
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| CNA2007101796155A Pending CN101202610A (en) | 2007-12-14 | 2007-12-14 | Retransmission control method in a wireless link controlling body |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108215A (en) * | 2013-02-01 | 2013-05-15 | 奥维通信股份有限公司 | Multiplexer data transmission method and device |
| WO2015018366A1 (en) * | 2013-08-08 | 2015-02-12 | 华为技术有限公司 | Method and device for scheduling |
| CN104836645A (en) * | 2014-02-12 | 2015-08-12 | 普天信息技术研究院有限公司 | Transmission method for RLC AM mode status feedback |
-
2007
- 2007-12-14 CN CNA2007101796155A patent/CN101202610A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108215A (en) * | 2013-02-01 | 2013-05-15 | 奥维通信股份有限公司 | Multiplexer data transmission method and device |
| WO2015018366A1 (en) * | 2013-08-08 | 2015-02-12 | 华为技术有限公司 | Method and device for scheduling |
| CN104836645A (en) * | 2014-02-12 | 2015-08-12 | 普天信息技术研究院有限公司 | Transmission method for RLC AM mode status feedback |
| CN104836645B (en) * | 2014-02-12 | 2018-02-27 | 普天信息技术研究院有限公司 | A kind of RLC AM mode state feedback transmission methods |
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Application publication date: 20080618 |