CN100356758C - Method for preventing send buffer overflow of radio link control layer - Google Patents
Method for preventing send buffer overflow of radio link control layer Download PDFInfo
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- CN100356758C CN100356758C CNB200410048386XA CN200410048386A CN100356758C CN 100356758 C CN100356758 C CN 100356758C CN B200410048386X A CNB200410048386X A CN B200410048386XA CN 200410048386 A CN200410048386 A CN 200410048386A CN 100356758 C CN100356758 C CN 100356758C
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Abstract
The present invention discloses a method for preventing the overflow of a transmitting buffer on a wireless link control layer, wherein the transmitting buffer is used for storing SDUs transmitted on an upper layer. The method comprises the following steps: A.an RLC on the wireless link control layer obtains the maximum buffering time T1 allowed by each SDU transmitted by the upper layer and the receiving time T2 of the SDU, and T1 and T2 are stored in the transmitting buffer according to the order of SDU receiving time; B. after the RLC passes a preset time period, the SDUs stored in the transmitting buffer are detected in sequence according to the maximum buffering time of the SDU and the receiving time of the SDU to discard overdue SDUs. The present invention has the advantages that the number of timers used by the RLC is greatly decreased, only simple time comparison operation needs to be carried out on part of the SDUs of each TTI in the transmitting buffer, and the overdue SDUs are discarded; the method has simple realization and high efficiency of the RLC.
Description
Technical field
The present invention relates to the wireless communication transmissions system, relate in particular to the method for wireless chain control layer transmission data in the wireless communication transmissions system.
Background technology
At present, in the wireless communication transmissions system, introduced global mobile communication system UMTS (UniversalMobile Telecommunications System).See also Fig. 1, it is a simplified structure diagram.It mainly is made up of three parts: core net 1 (CN), land radio access web 2 (UTRAN) and terminal 3 (UE).Between terminal 3 and land radio access web 2, connect by Uu (wave point also can be described as air interface).In order to reach the purpose of mutual communication, adopted identical air interface protocol between the air interface.
See also Fig. 2, it is the architecture of air interface protocol.It mainly is divided into three layers, lowermost layer be physical layer (PHY) L1, being positioned on the physical layer is data link layer L2, being positioned on the data link layer is network layer L3.See that vertically protocol architecture is divided into the control plane and a user plane that is used to send data message of be used to transmit control signal (signaling).
Data link layer is divided into several sublayers, from control plane, it comprises media access control layer (MAC) and wireless chain control layer (RLC), from user plane, it also comprises the packet data protocol convergence sublayer (PDCP) of handling Packet Service and is used to handle the broadcast/multi broadcast control sublayer (BMC) of broadcast/multi broadcast business.Network layer mainly comprises radio resource control layer (RRC).
Physical layer provides the service of transmission by transmission channel to MAC, and transmission information is feature with the transmission means of data, and designation data is to transmit in which way.
MAC provides the service of transmission by logic channel to RLC.Logical message is a feature with the type that sends data, and which kind of type is the data of indication transmission be.
RLC provides the foundation of data link and discharges service.At control plane, the business on RLC carrying upper strata be referred to as Signaling Radio Bearer (Signal radio bearer, SRB), the data of transmitting on Signaling Radio Bearer are signalings; At user plane, if when PDCP and BMC are not used by business, the business on RLC carrying upper strata be referred to as radio bearer (radio bearer, RB), otherwise RB is by PDCP and BMC carrying, the data of transmitting on radio bearer are user profile.Signaling and user profile are all transmitted by RLC.Transmits data packets is drawn together and is sent data and receive data, and data packets for transmission is drawn together signaling and user profile.
Wherein, RLC sends data and may further comprise the steps: at first, RLC receives the RLC Service Data Unit (SDU) that sends from the upper strata; Then, with SDU (s) segmentation and/or be cascaded into PDU (s), send according to the indication of MAC then and specify number a PDU (s) to MAC.
There are three kinds of data transmission modes in rlc layer: transparent mode TM, Unacknowledged Mode UM and affirmation mode AM.
When RLC sends data with transparent mode, do not add any control protocol expense from the SDU on upper strata and be arranged to PDU (s) and be sent to MAC, and no matter whether the recipient receives, for transmit leg as long as PDU sends.
When RLC sends data with Unacknowledged Mode, allow SDU is obtained PDU in the mode of segmentation and/or cascade, and in process of transmitting no matter the recipient whether receive, for transmit leg as long as PDU sends.
When RLC sends data with deterministic model, when a PDU sends failure, support to retransmit.Usually, the SDU that transmit leg RLC will receive from the upper strata is divided into predefined size by segmentation and/or cascade earlier, and interpolation comprises that the control protocol expense of sequence number is to form PDU then.Transport process is to send PDU according to sequence number, and the sequence number that the inspection of recipient's rlc layer receives is so that require the rlc layer of transmit leg to send the PDU that those send failure once more.
No matter be what pattern to send data by, on RLC, all be provided with a transmit buffer, be used to cushion the upper strata and send the SDU (s) that gets off.For send data with transparent mode and Unacknowledged Mode for, as PDU (s) when sending, corresponding SDU (s) just deletes from transmit buffer, for for affirmation mode transmission data, when PDU (s) was identified reception, corresponding SDU (s) just deleted from transmit buffer.Corresponding SDU (s) is meant the complete SDU (s) that comprises among the described PDU (s), for example when several SDU are cascaded into a PDU, when this PDU sends (transparent mode and Unacknowledged Mode)/affirmation reception (affirmation mode), these SDU (s) delete from transmit buffer, and when being segmented into several PDU by a SDU, after those PDU all send/confirm and receive, could be with this SDU deletion.
But, be subjected to the restriction of communication system data transmission rate, the SDU that RLC receives (s) differs and is all sent immediately surely, this moment is if the transmission rate of SDU (s) is very fast again, then can cause and have a large amount of SDU (s) that do not send in the transmit buffer, and the size of transmit buffer is limited, so phenomenon that exists transmit buffer to overflow, thereby cause new SDU (s) can't enter RLC, and then influence the transfer of data of follow-up air interface, this SDU (s) that just need in time abandon in the transmit buffer overflows to prevent transmit buffer, and then guarantees normal data communication.
At present, prevent that the method that the transmit buffer of rlc layer overflows from mainly containing following two kinds:
First kind of SDU discarding method that is based on the time.Promptly use a timer to carry out SDU discarding method in the time-based transmit buffer.The method that second kind of SDU abandons is that restriction sends number of times, promptly uses a counter to carry out based on the SDU discarding method in the transmit buffer of number of times.
RRC by network layer specifies this RLC (or RB) to go up the maximum time of permission SDU buffering or the maximum times of its transmission when RLC is configured.Below specifically introduce the method (seeing also Fig. 3) that first kind of transmit buffer that prevents rlc layer overflows.
Rlc layer receives a SDU, starts one and abandons timer.If this SDU has been sent to MAC (for the TM/UM pattern) or this SDU and is confirmed to receive (for the AM pattern) by the opposite end before timer expiry, then stop this timer, otherwise, from transmit buffer, abandon this SDU.
From the above, on the one hand, because timer expiry can occur in any time, so RLC has to interrupt ongoing other operation and goes to handle overtime incident; On the other hand, because a SDU need abandon timer by one and control, and the number of SDU is and is huge, then RLC must manage the huge timer of number, increase the RLC management thus and abandon the complexity of timer, and cause the efficient that sends data low.
Summary of the invention
The object of the present invention is to provide a kind of method that realizes that the transmit buffer that prevents wireless chain control layer simple, that efficient is high overflows, because distributing one for each SDU, rlc layer abandons timer with what exist in the solution prior art, thus the low technical problem of transmission data efficiency that causes the complex management of timer among the RLC and cause thus.
For addressing the above problem, the invention provides the method that a kind of transmit buffer that prevents wireless chain control layer overflows, described transmit buffer is used to store the Service Data Unit SDU that the upper strata sends, may further comprise the steps: A: each SDU that described wireless chain control layer RLC obtains to be sent by the upper strata allows the maximum time of buffering and the time of reception of this SDU, and deposits described transmit buffer in proper order in according to the time of reception of SDU; B:RLC is every through after the predefined time cycle, and the time of reception that allows maximum time of buffering and this SDU according to described SDU is the SDU of detection of stored in transmit buffer successively, to abandon expired SDU.
Among the step B successively detection of stored at the SDU of described transmit buffer, specifically comprise to abandon expired SDU: B1: whether the SDU that enters at first that detects in transmit buffer is expired, if T3-T2＞=T1 sets up, then delete this SDU, next SDU in the transmit buffer is the SDU that enters at first in the transmit buffer, proceeds step B1; Otherwise stop to detect, wherein, T1 is the maximum time of this SDU permission buffering, and T2 is the time that RLC receives this SDU, and T3 detects the current time.
The predefined time cycle described in the step B is a Transmission Time Interval TTI.T3 is TTI time started or TTI concluding time.
Wherein, this method is further comprising the steps of: when RLC receives new SDU and described buffer memory when being not enough to preserve described SDU, RLC abandons the SDU that enters at first in the described transmit buffer, receives described SDU with preservation.
Further comprising the steps of between steps A and the step B: as to send protocol Data Unit PDU with transparent mode or Unacknowledged Mode, when described PDU sends, delete SDU corresponding in the described transmit buffer.
Further comprising the steps of between steps A and the step B: as to send PDU with affirmation mode, when the described PDU acknowledge message of receiving of receiving that the recipient sends, delete SDU corresponding in the described transmit buffer.
Compared with prior art, the present invention has the following advantages: method of the present invention and prior art are all controlled SDU based on the time restriction mode and are abandoned, but compare with the existing method of utilizing timer control SDU to abandon, reduced the number of RLC use timer to a great extent, make RLC handle timer expiry no longer continually, the substitute is, RLC only needs at each TTI the part SDU (s) that sends in the buffer memory to be carried out simple time comparison operation.Thereby the described method of this patent is more simple, and can improve the efficient of RLC.
Description of drawings
Fig. 1 is the simplified structure schematic diagram of wireless communication transmissions system.
Fig. 2 is the architecture of air interface protocol.
Fig. 3 is the flow chart that prevents that the transmit buffer of rlc layer from overflowing.
Fig. 4 is that the present invention prevents a kind of flow chart that the transmit buffer of wireless chain control layer overflows.
Fig. 5 be among Fig. 4 detection of stored at the whether expired flow chart of the SDU of transmit buffer.
Embodiment
Following with reference to accompanying drawing, specify the present invention.
What the present invention was suitable for is to be suitable for the wireless communication transmissions system that adopts air interface protocol, and this system comprises TD-SCDMA (TD SDMA) communication system.
See also Fig. 4, it prevents a kind of flow chart that the transmit buffer of wireless chain control layer overflows for the present invention.Transmit buffer is used to store the Service Data Unit SDU that the upper strata sends, and may further comprise the steps:
S210: each SDU that wireless chain control layer RLC obtains to be sent by the upper strata allows the maximum time of buffering and the time of reception of each SDU, and deposits transmit buffer in proper order in according to the time of reception of SDU;
When RLC receives each SDU, preserve the maximum time that this SDU allows buffering, this time is designated as T1, T1 is being specified when being configured this RLC (or RB) by the RRC of network layer, and preserves the current time T2 that receives this SDU.That is, in RLC, corresponding two the time value T1 of each SDU and T2, and put into the transmit buffer of RLC successively according to the time of reception order.
S220:RLC is every through after the predefined time cycle, allows the maximum time of buffering and the time of reception of this SDU according to the SDU that obtains, and whether detection of stored is expired at the SDU of transmit buffer (s) successively, to abandon expired SDU (s);
In this step, RLC can allow the maximum time of buffering and the time of reception of this SDU according to each SDU in the transmission buffer, whether set up by the T3-T2＞=T1 that judges each SDU that (T1 is that this SDU allows the maximum time of buffering, T2 is the time that RLC receives this SDU, T3 detects the current time), determine whether abandoning this SDU, if set up, then abandon this SDU, and whether the next SDU in the inspection transmission buffer need to abandon, otherwise just check directly whether the next SDU in the transmission buffer needs to abandon.
Also can adopt another kind of better embodiment to realize, see also Fig. 5, specifically comprise:
S310: whether the SDU that enters at first that detects in transmit buffer is expired, if T3-T2＞=T1 sets up, then deletes this SDU, and the next SDU in the transmit buffer is the SDU that enters at first in the transmit buffer, proceeds step S310; Otherwise stop to detect, wherein, T1 is the maximum time of this SDU permission buffering, and T2 is the time that RLC receives this SDU, and T3 detects the current time.
The predefined time cycle is a Transmission Time Interval TTI in the above-mentioned steps, and T3 can choose time started or a TTI concluding time of a TTI.T3 can select the time started of a TTI or the concluding time of a TTI during selection of time point T3.The selection of time point T3 can influence the number that abandons of SDU constantly.The SDU number that begins to abandon that T3 is selected in a TTI can lack than the SDU number that the end that is selected in a TTI abandons.
Between step S210 and step S220, if RLC sends PDU with transparent mode or Unacknowledged Mode, when described PDU sends, corresponding SDU in the deletion transmit buffer.
If send PDU, when the described PDU acknowledge message of receiving of receiving that the recipient sends, delete SDU corresponding in the described transmit buffer with affirmation mode.
The described method of this patent is only carried out abandoning of SDU when each TTI finishes, then a SDU sends the maximum time 〉=T1 that is preserved in the buffer memory at RLC.For fear of owing to can not in time abandoning the situation that transmission buffer memory that SDU causes overflows, so RLC is when receiving new SDU, be not enough to preserve this new SDU if send buffer memory, RLC can adopt and abandon the SDU that receives the earliest and come release portion to send buffer memory to be used to preserve this new SDU.
Realization of the present invention is based under the very low situation of frequency that the T1 value of upper-layer configured generally can not change or change.If T1 value can not change, be tactic because RLC is sent to the SDU of transmit buffer according to time of reception, then not overtime as if the SDU that receives earlier, the SDU (s) that receives after then scarcely can be overtime; If the T1 value can change, but the T1 value of new configuration is during less than the T1 value that disposed originally, the not overtime and overtime phenomenon of back SDU (s) of the SDU that may occur receiving earlier, then these overtime SDU (s) will can not lose, this can influence the accuracy that this TT1 abandons SDU, these overtime SDU (s) can be sent to MAC after next TTI arrives, just SDU abandons and can recover normal subsequently, if the frequency that changes of T1 is very low, then this phenomenon can not cause big influence to the accuracy that RLC abandons SDU.
More than disclosed only for specific embodiment of the present invention, but the present invention is not limited thereto, those skilled in the art can think variation and change, all should drop on protection scope of the present invention.
Claims (7)
1, a kind of transmit buffer that prevents wireless chain control layer method of overflowing, described transmit buffer is used to store the Service Data Unit SDU that the upper strata sends, and it is characterized in that, may further comprise the steps:
A: each SDU that described wireless chain control layer RLC obtains to be sent by the upper strata allows the maximum time of buffering and the time of reception of each SDU, and deposits described transmit buffer in proper order in according to the time of reception of SDU;
B:RLC is every through after the predefined time cycle, allows the maximum time of buffering and the time of reception of this SDU according to described SDU, and the SDU of detection of stored in transmit buffer successively is to abandon expired SDU.
2, the transmit buffer that the prevents wireless chain control layer as claimed in claim 1 method of overflowing is characterized in that, among the step B successively detection of stored specifically comprise to abandon expired SDU at the SDU of described transmit buffer:
B1: whether the SDU that enters at first that detects in transmit buffer is expired, if T3-T2＞=T1 sets up, then deletes this SDU, and the next SDU in the described transmit buffer is the SDU that enters at first in the transmit buffer, proceeds step B1; Otherwise stop to detect, wherein, T1 is the maximum time of this SDU permission buffering, and T2 is the time that RLC receives this SDU, and T3 detects the current time.
3, the transmit buffer that the prevents wireless chain control layer as claimed in claim 2 method of overflowing is characterized in that the predefined time cycle described in the step B is a Transmission Time Interval TTI.
4, the transmit buffer that the prevents wireless chain control layer as claimed in claim 3 method of overflowing is characterized in that T3 is TTI time started or TTI concluding time.
5, the transmit buffer that the prevents wireless chain control layer as claimed in claim 1 or 2 method of overflowing, it is characterized in that, further comprising the steps of: when RLC receives new SDU and described buffer when being not enough to preserve described SDU, RLC abandons the SDU that enters at first in the described transmit buffer, the new SDU that receives with preservation.
6, the transmit buffer that the prevents wireless chain control layer as claimed in claim 1 or 2 method of overflowing is characterized in that, and is further comprising the steps of between steps A and the step B:
Send protocol Data Unit PDU with transparent mode or Unacknowledged Mode, when described PDU sends, delete SDU corresponding in the described transmit buffer.
7, the transmit buffer that the prevents wireless chain control layer as claimed in claim 1 or 2 method of overflowing is characterized in that, and is further comprising the steps of between steps A and the step B:
Send PDU with affirmation mode, when the described PDU acknowledge message of receiving of receiving that the recipient sends, delete SDU corresponding in the described transmit buffer.
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| CNB200410048386XA CN100356758C (en) | 2004-06-30 | 2004-06-30 | Method for preventing send buffer overflow of radio link control layer |
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| CNB200410048386XA CN100356758C (en) | 2004-06-30 | 2004-06-30 | Method for preventing send buffer overflow of radio link control layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1913534B (en) * | 2006-08-17 | 2010-12-01 | 华为技术有限公司 | Data processing method and communication equipment |
| CN101388826B (en) * | 2007-09-10 | 2011-02-02 | 鼎桥通信技术有限公司 | Method and apparatus for sending rearranged cache zone information |
| CN101217466B (en) * | 2007-12-28 | 2012-07-11 | 中国科学院计算技术研究所 | A data processing method and processing device of wireless network media access control system |
| CN101883390A (en) * | 2010-06-25 | 2010-11-10 | 京信通信***（中国）有限公司 | Method for managing service data unit (SDU) for radio link control (RLC) layer and system thereof |
| CN103987084A (en) * | 2014-05-05 | 2014-08-13 | 京信通信***（中国）有限公司 | Method and device for processing service data unit |
| CN105337854B (en) * | 2014-07-14 | 2018-10-26 | 杭州迪普科技股份有限公司 | A kind of routing iinformation retransmission method and device |
| CN110011925B (en) * | 2018-01-04 | 2022-09-13 | 维沃移动通信有限公司 | SDU processing method and communication equipment |
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| CN1348316A (en) * | 2000-10-07 | 2002-05-08 | Lg电子株式会社 | Method for transmitting datas from radio chain-circuit control layer in radio communication system |
| CN1437369A (en) * | 2002-02-04 | 2003-08-20 | 华硕电脑股份有限公司 | Method of ending servo data unit and deleting signalling program in radio communication system |
| WO2004042953A1 (en) * | 2002-11-07 | 2004-05-21 | Lg Electronics Inc. | Method for moving a receive window in a radio access network |
| KR20040048167A (en) * | 2002-12-02 | 2004-06-07 | 아스텍 컴퓨터 인코퍼레이티드 | Processing unexpected transmission interruptions in a wireless communications system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1348316A (en) * | 2000-10-07 | 2002-05-08 | Lg电子株式会社 | Method for transmitting datas from radio chain-circuit control layer in radio communication system |
| CN1437369A (en) * | 2002-02-04 | 2003-08-20 | 华硕电脑股份有限公司 | Method of ending servo data unit and deleting signalling program in radio communication system |
| WO2004042953A1 (en) * | 2002-11-07 | 2004-05-21 | Lg Electronics Inc. | Method for moving a receive window in a radio access network |
| KR20040048167A (en) * | 2002-12-02 | 2004-06-07 | 아스텍 컴퓨터 인코퍼레이티드 | Processing unexpected transmission interruptions in a wireless communications system |
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