CN100391201C - Method for holding packet data protocol convergence sublayer sequence number synchronization - Google Patents
Method for holding packet data protocol convergence sublayer sequence number synchronization Download PDFInfo
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Abstract
The present invention relates to a method for maintaining the synchronization of PDCP serial numbers, which is applied to an RLC working in a discarding mode and comprises the following steps: when detecting a discarding process, a transmitter RLC transmits serial numbers of SDUs to be discarded to a receiver RLC, and receives a returned response message; the receiver RLC determines the total number of the SDUs to be discarded actually according to the serial number information of the SDUs, and transmits the total number to a receiver PDCP, and the receiver PDCP directly adds the number to the current PDCP serial number. The serial number information of the SDUs comprises the serial number information of each SDU to be discarded in the current discarding process, and the serial number information refers to an RLC PDU serial number corresponding to the last section of each SDU; the RLC PDU serial number is transmitted through displaying discarding signalling. The application of the method of the present invention supports lossless transfer when the RLC works in a discarding mode.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of Wideband Code Division Multiple Access (WCDMA) and insert in (WCDMA, Wideband Code Division Multiple Access) air interface technologies, RLC abandons the method that keeps the PDCP sequence number synchronization under the mode.
Background technology
Universal mobile telecommunications system (UMTS, Universal Mobile Telecommunications System) be to adopt Wideband Code Division Multiple Access (WCDMA) to insert (WCDMA, Wideband Code Division Multiple Access) 3-G (Generation Three mobile communication system) of air interface technologies is also referred to as the WCDMA communication system usually.The WCDMA communication system comprises Radio Access Network (RAN, Radio Access Network) and core network (CN, Core Network).Wherein, RAN realizes all and wireless function associated being also referred to as universal terrestrial access network (UTRAN, Universal Terrestrial Radio Access Network) usually.The wave point of UTRAN is divided into physical layer, data link layer and network layer, wherein, network layer comprises Radio Resource control (RRC, Radio Resource Control) sublayer, data link layer comprises medium access control system (MAC, Medium Access Control) sublayer, Radio Link control (RLC, Radio Link Control) sublayer, broadcast/group broadcast control (BMC, Broadcast/Multicast Control) sublayer and PDCP (PDCP, Packet Data Convergence Protocol) sublayer, physical layer links to each other with the media access control sublayer of data link layer and the RRC sublayer of network layer by Service Access point (SAP, Service Access Point).
Grouping busihess data transmission, the compression of IP head and lossless migration are mainly finished in the PDCP sublayer.In order to improve bandwidth utilization, generally do not carry the information (being the PDCP sequence number) of expression packet sequence in the packet that the PDCP sublayer sends or receives, as shown in Figure 1, Fig. 1 has described the data exchange process between PDCP and the RLC.At first introduce two nouns---SDU and PDU, receive that the data from the upper strata are called service data unit (SDU, Server Data Unit), the data that mail to lower floor are called protocol Data Unit (PDU, ProtocolData Unit).Following line number passes to example PDCP sequence number synchronization process is described: a descending transmission PDCP sequence number has been safeguarded in the PDCP sublayer of UTRAN, and the PDCP sublayer of UE (User Equipment subscriber equipment) is corresponding has safeguarded a descending reception PDCP sequence number.In initial condition, two sequence numbers all are set to 0, and after the beginning transfer of data, the PDCP sublayer of UTRAN is about to descending transmit leg PDCP sequence number and adds 1 to PDCP PDU of the every transmission of the RLC of lower floor; And a RLC SDU from the RLC of lower floor is whenever received in the PDCP sublayer of UE, is about to descending recipient PDCP sequence number and adds 1; By this method, can make the PDCP sequence number at two ends reach consistent.
Wireless chain control layer (RLC) layer is supported affirmation mode (AM, Acknowledge Mode), Unacknowledged Mode (UM, Un-Acknowledge Mode) and transparent mode (Transparent Mode TM,) three kinds of working methods, mainly finish functions such as transfer of data, flow control, encryption and decryption.Because the general requirement of the Service Properties (Qos, Quality of Service) of data service guarantees the reliability of data, therefore in data service, use the AM pattern of RLC usually.As shown in Figure 2, under the AM pattern, after RLC receives PDU from PDCP, at first carry out segmentation and cascade according to the size of the affirmation mode data PDU (AMD PDU, AM Data PDU) of configuration; Fill the rlc protocol head then and be assembled into RLC PDU, each RLC PDU comprises the sequence number of this RLC PDU; Finish operation such as encryption back at last and send to data receiver RLC by wireless channel, recipient RLC whenever receives a RLC PDU, return acknowledge message according to the status report mechanism of setting to recipient RLC, if all RLC PDU of a RLC SDU receive that the RLC PDU that then these is received is submitted to high level after being reassembled as a complete RLC SDU.
The form of AMD PDU as shown in Figure 3, wherein: the D/C domain representation be data PDU or control PDU, 1 the expression be data PDU, 0 the expression be control PDU; SN represents RLC PDU sequence number, and RLC PDU sequence number is set to 0 under the initial condition, PDU of every transmission, and RLC PDU sequence number adds 1; P whether need to represent the report of opposite end return state, and 1 for being that 0 for denying; HE and E represent that next byte is LengthIndicator or data; Length Indicator represents the end position of last segmentation of RLC SDU at current PDU; If do not comprise the last segmentation of SDU among the current PDU, then there is not Length Indicator territory, if comprise the last segmentation of a plurality of SDU among the current PDU, then there is a plurality of Length Indicator territory.
On the other hand, because IP/UDP/RTP (Internet Protocol Internet protocol; User DataProtocol UDP; Real-time Transport Protocol RTP) application of video stream traffic in WCDMA system mobile communication increases day by day, and these video stream traffic are very high for the requirement of real-time, when guaranteeing data reliability, in order to satisfy the requirement of professional real-time as much as possible, in the existing protocol, RLC has proposed a kind of drop mechanism based on explicit signaling under the AM pattern, the triggering that abandons comprises overtime abandon and re-transmission abandons dual mode, in overtime drop mechanism, transmit leg RLC receives one from starting timer T after the data of PDCP, if do not receive also that after T is overtime the opposite end correctly receives the affirmation message of this SDU, then trigger abandoning; Retransmitting under the drop mechanism, correctly do not received, then triggering abandoning by the opposite end if a RLC PDU repeatedly retransmits still through transmit leg.
The drop mechanism flow process of explicit signaling as shown in Figure 4, after transmit leg triggers and abandons, can send an explicit signaling (MRW SUFI) that abandons to the recipient by air interface, wherein carry the sequence number information of the SDU (Server Data Unit) that transmit leg abandons, i.e. the pairing RLC PDU of the last segmentation of SDU sequence number; And after the recipient receives that this abandons signaling, can initiate to abandon process and return to abandon response message (MRW ACK SUFI) according to the information among the MRW SUFI, can carry the recipient in this message and expect the next RLC PDU sequence number that receives, after the recipient receives that this abandons response message, next RLC PDU according to the information decision of wherein carrying sends finishes to abandon process.
In the prior art, the packet number that transmit leg sends when abandoning may be more than the packet number that the recipient receives, though stipulated the above-mentioned explicit signaling that abandons in the protocol in prior art, do not use the concrete grammar that this abandons signaling assurance lossless migration but provide, therefore the prior art according to definition among the 3GPP 25323 can't guarantee sequence number synchronization, thereby does not support lossless migration under the pattern abandoning.
Summary of the invention
The present invention proposes and a kind ofly abandon the method that guarantees the PDCP sequence number synchronization under the situation of pattern, to support lossless migration at configuration RLC.
A kind of method that keeps the PDCP sequence number synchronization is applied to RLC and is operated in when abandoning mode, comprises the following steps:
Transmit leg RLC is checked through when abandoning process, and the sequence number information of SDU to be abandoned is sent to recipient RLC and receives the response message that returns;
Recipient RLC determines total number of the actual SDU that abandons and sends to recipient PDCP according to the sequence number information of described SDU, by recipient PDCP current PDCP sequence number directly increased this number.
The sequence number information of described SDU comprises current abandoning in the process, the sequence number information of the SDU that each is to be abandoned.
In the described method: when recipient RLC received among the transmit leg RLC SDU to be abandoned certain or some, total number of the actual SDU that abandons that described recipient RLC determines is meant: total number of the SDU that transmit leg RLC is to be abandoned deducts among this SDU to be abandoned the number of the SDU that the side of being received RLC receives, and recipient RLC submits the SDU that goes back no delivery attempted among the described SDU that has received to PDCP; Perhaps, when recipient RLC did not receive among transmit leg RLC all SDU to be abandoned any one, total number of the actual SDU that abandons that described recipient RLC determines was meant: total number of the SDU that transmit leg RLC is to be abandoned.
The sequence number information of described SDU is meant the RLC PDU sequence number of the last segmentation correspondence of each SDU; And, comprise in the described response message that recipient RLC expects the sequence number of the next RLC PDU of reception.
The sequence number of the RLC PDU of the last segmentation correspondence of SDU described to be abandoned sends by the explicit signaling that abandons.
Described method also comprises: in the RLC configuration parameter message that RRC sends, increase an indication information, in the described explicit sequence number information that abandons the SDU that comprises in the signaling that each is to be abandoned that sends, data receiver RLC is corresponding to return described response message by this indication information designation data transmit leg RLC.
By using the method for the invention, abandon at configuration RLC and to keep the PDCP sequence number synchronization under the pattern, cancelled the restriction of existing protocol for lossless migration, expanded the range of application of lossless migration greatly.
Description of drawings
Fig. 1 is the data exchange process schematic diagram between PDCP and the RLC;
Fig. 2 is a RLC AM working mode figure;
Fig. 3 is an AMD PDU format chart;
Fig. 4 abandons pattern diagram for the SDU based on explicit signaling;
Fig. 5 is a MRW SUFI form schematic diagram;
Fig. 6 is a MRW ACK SUFI form schematic diagram;
Fig. 7 embodiment two flow charts;
Fig. 8 is the form schematic diagram that carries PDCP serial number data bag.
Embodiment
The RLC that the present invention proposes abandons the method that realizes the PDCP sequence number synchronization under the pattern and is finished jointly by PDCP in the WCDMA mobile communication system and RLC sublayer.
RLC abandons under the pattern, when detecting, RLC abandons when taking place, send the explicit signaling that abandons to recipient RLC, wherein carry the sequence number information of the SDU that remains to be abandoned, recipient RLC finishes the process of abandoning and returns according to the sequence number information of SDU and abandons response message, and the information of SDU above-mentioned to be abandoned also can be finished by self-defining mutual signaling.Under this mode of operation, the invention provides two kinds of methods the PDCP sequence number is maintained to synchronously.Embodiment one be explicit abandon carry in the signaling the sequence number information of the SDU that remains the to be abandoned number of determining the actual SDU that abandons by the recipient according to this information the PDCP sequence number is adjusted to consistent with transmit leg; Embodiment two is after the process that abandons finishes, initiatively send a packet that carries the PDCP sequence number by transmit leg PDCP sublayer, the recipient is according to the PDCP sequence number of the PDCP sequence number update local maintenance in this packet, thereby reaches both sides' sequence number synchronization.
Embodiment one: the PDCP sequence number synchronization is finished in RLC and the cooperation of PDCP sublayer by the recipient
At first send to and increase configuration cell " Send MRW " in the RLC parameter configuration message of RAN and UE side at RRC (radio resource controller Radio Resource Controller), when this cell is set to TRUE, expression is when abandoning, and explicit the abandoning that transmit leg sends needs to carry the RLC PDU sequence number information that each abandons last segmentation correspondence of SDU among the signaling MRW SUFI.
MRW SUFI can adopt form as shown in Figure 5, and wherein: LENGTH represents the number of SN_MRW among the current MRWSUFI; SN_MRWi represents that each abandons the RLC PDU sequence number of the last segmentation correspondence of SDU among the MRW SUFI, Nlenght and SN_MRWlength represent the end position of the SDU that last abandons together, wherein SN_MRWlength represents the RLC PDU sequence number of the last segmentation correspondence that last abandons SDU, the recipient can judge transmit leg SDU to be abandoned according to each RLC PDU sequence number that abandon the last segmentation correspondence of SDU, determines further according to the current SDU that receives but also do not submit that reality does not receive part among the SDU to be abandoned.
MRW ACK SUFI can adopt form as shown in Figure 6, and wherein: the last segmentation that N represents this SDU is to which the Length Indicator in should RLC PDU; SN_ACK represents the next one of sequence number of last RLC PDU of current reception, the RLC PDU sequence number that promptly next expectation receives; N and SN_ACK determine together whether the current process that abandons finishes, and when satisfying one of following condition, illustrates that the process of abandoning finishes:
1, SN_ACK equals SN_MRWlength, and N equals Nlenght;
2, SN_ACK is greater than SN_MRWlength, and N equals 0;
Like this, transmit leg sends next RLC PDU according to the sequence number of SN_ACK indication;
Transmit leg starts timer T (T is disposed by rrc layer) when sending MRW SUFI, if the MRW ACK SUFI that does not receive MRW ACK SUFI after T is overtime or receive does not satisfy above-mentioned any one condition, then transmit leg resends MRW SUFI, N (N is disposed by rrc layer) is inferior still to can not get correct MRW ACK SUFI if send, and transmit leg will be initiated reseting procedure.
After recipient's RLC receives the MRW SUFI of transmit leg, travel through each SDU to be abandoned, if wherein certain or some SDU that transmit leg is to be abandoned receive the side of being received, in the SDU that these have received, may also have part because discontinuous and be not submitted to the PDCP sublayer, then these SDU directly are submitted to upper strata PDCP, PDCP correspondingly increases receive sequence number; Record also is not submitted to the SDU number of upper strata PDCP, the SDU number that promptly really is dropped; Then the actual SDU number that abandons is sent to upper strata PDCP, after PDCP receives the SDU number that abandons, upgrade PDCP sequence number (the actual SDU number that abandons of SN+ before the SN=after the renewal upgrades).
If when recipient RLC did not receive all transmit leg RLC SDU to be abandoned, total number of SDU then that transmit leg RLC is to be abandoned sent to upper strata PDCP as total number of the actual SDU that abandons.
Simultaneously, recipient's RLC returns a MRWACK SUFI to transmit leg RLC, and transmit leg RLC is according to the information decision PDU sequence number next to be sent that wherein carries.
After finishing aforesaid operations, both sides' PDCP sequence number reaches synchronous.
Embodiment two: send the packet that carries the PDCP sequence number by PDCP and finish sequence number synchronization
Owing to can carry the PDCP sequence number among the PDU of PDCP, in order to support the lossless migration under the pattern that abandons, after the RLC of transmit leg receives the MRW ACK SUFI that recipient RLC returns, send one to PDCP and abandon indication, require PDCP in the packet that the next one sends, to carry corresponding PDCP sequence number, after recipient PDCP receives the packet of this tape serial number, no matter what the PDCP sequence number of current maintenance is, all according to the PDCP sequence number of the current maintenance of sequence number update of carrying among the PDCP PDU that receives.
Detailed process is as shown in Figure 7: after recipient RLC receives MRW SUFI, after all current SDU that go back no delivery attempted that receive are submitted to PDCP, return MRWACK SUFI to the RLC of transmit leg, comprise the sequence number of the next RLC PDU that recipient RLC expectation receives among the MRWACK SUFI; After the RLC of transmit leg receives the MRW ACK SUFI that recipient RLC returns, to the PDCP synchronous Indication message that transmits Sequence Number, form is as " PDCP SEQ SYN IND ", after PDCP receives Indication message, in next packet, carry the PDCP sequence number of local maintenance, form is " PDCP SEQ DATA PDU ", after RLC receives this packet, by segmentation, operations such as cascade (supposing to be segmented into N AMD PDU), send it to recipient's RLC, after recipient RLC receives this N AMD PDU, be submitted to PDCP after being reassembled as SDU, the receive sequence number that recipient PDCP is current according to the sequence number update in this packet, thus the synchronous of PDCP sequence number finished.
The form that carries the packet of sequence number can be as shown in Figure 8, and wherein: PDU type represents the type of current PDU, and 001 expression is the PDU of a tape serial number, and 000 represents the not PDU of tape serial number; PID represents the bag type of head compression; Sequence number represents the sequence number of current PDCP, and this territory is just to exist in 001 o'clock at PDUtype only.
Above-mentioned two kinds of methods all utilize the explicit signaling mechanism that abandons to keep the PDCP sequence number synchronization, when adopting the method for embodiment one, recipient RLC need know the details of the SDU that transmit leg is to be abandoned, therefore explicitly abandons the sequence number information that signaling need be carried each SDU to be abandoned; And when adopting the method for embodiment two, the details of the SDU that recipient RLC does not need to know that transmit leg is to be abandoned therefore explicitly abandon the sequence number information that signaling can not carried each SDU to be abandoned.
Under RLC abandons pattern,, can abandon in the RLC configuration and support lossless migration and sequence number synchronization under the pattern situation by the information of using MRW SUFI to carry each SDU to be abandoned; Perhaps direct method by the packet that transmits Sequence Number guarantees sequence number synchronization.
The above only is a preferred implementation of the present invention; the explicit also a kind of mode of the SDU information that abandons of data receiver and recipient interaction just of signaling that abandons; also can finish by self-defining mutual signaling; the explicit signaling that abandons does not limit protection range; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a method that keeps packet data protocol convergence sublayer PDCP sequence number synchronization is applied to control sub layer of wireless link RLC and is operated in when abandoning mode, it is characterized in that, comprises the following steps:
Transmit leg RLC is checked through when abandoning process, and the sequence number information of service data unit SDU to be abandoned is sent to recipient RLC and receives the response message that returns;
Recipient RLC determines total number of the actual SDU that abandons and sends to recipient PDCP according to the sequence number information of described SDU, by recipient PDCP current PDCP sequence number directly increased this number.
2. the method for claim 1 is characterized in that, the sequence number information of described SDU comprises current abandoning in the process, the sequence number information of the SDU that each is to be abandoned.
3. method as claimed in claim 2 is characterized in that:
When recipient RLC received among the transmit leg RLC SDU to be abandoned certain or some the time, total number of the actual SDU that abandons that described recipient RLC determines is meant: total number of the SDU that transmit leg RLC is to be abandoned deducts the number of this certain or some SDU, and recipient RLC submits this certain or some SDU to PDCP; Perhaps,
When recipient RLC did not receive among transmit leg RLC all SDU to be abandoned any one, total number of the actual SDU that abandons that described recipient RLC determines was meant: total number of the SDU that transmit leg RLC is to be abandoned.
4. method as claimed in claim 2 is characterized in that, the sequence number information of described SDU is meant the control sub layer of wireless link protocol Data Unit RLC PDU sequence number of the last segmentation correspondence of each SDU; And, comprise in the described response message that recipient RLC expects the sequence number of the next RLC PDU of reception.
5. method as claimed in claim 4 is characterized in that, the sequence number of the RLC PDU of the last segmentation correspondence of SDU described to be abandoned sends by the explicit signaling that abandons.
6. method as claimed in claim 5, it is characterized in that, described method also comprises: in the RLC configuration parameter message that Radio Resource control sublayer RRC sends, increase an indication information, in the described explicit sequence number information that abandons the SDU that comprises in the signaling that each is to be abandoned that sends, data receiver RLC is corresponding to return described response message by this indication information designation data transmit leg RLC.
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Effective date of registration: 20211222 Address after: 450046 Floor 9, building 1, Zhengshang Boya Plaza, Longzihu wisdom Island, Zhengdong New Area, Zhengzhou City, Henan Province Patentee after: Super fusion Digital Technology Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |