CN101754304B - User face data inverse-transmitting method for realizing the switching across base station - Google Patents
User face data inverse-transmitting method for realizing the switching across base station Download PDFInfo
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- CN101754304B CN101754304B CN2008102247126A CN200810224712A CN101754304B CN 101754304 B CN101754304 B CN 101754304B CN 2008102247126 A CN2008102247126 A CN 2008102247126A CN 200810224712 A CN200810224712 A CN 200810224712A CN 101754304 B CN101754304 B CN 101754304B
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Abstract
The present invention discloses a user face data inverse-transmitting method for realizing the switching across a base station, which comprises the following steps: data is received by a user face; message protocol dada units PDUs are stored at a high layer, and a lower layer is noticed to process massage protocol; after the massages are successfully transmitted, the PDUs of corresponding massages are deleted by the high layer according to the touching of the lower layer; when is switched, the high layer of a source side base station sends the PDUs of stored massages which need to be transmitted inversely to an target base station. Thus, when data needs to be transmitted inversely, by the linkage of the high layer and the lower layer, the data is directly sent out by the high layer to the target base station, so a data processing path is greatly shortened, and further, the processing time delay in the switching across a base station is extendedly reduced. On the premise that the existing protocol is followed, switched data is moved to the GTPU layer of TNL by inverse-transmitting operation. Thus, not only the lossless transmission of the switched data is realized, but also the inverse-transmitting time delay of the data can be effectively reduced, the repeated data processing and interlayer data copying are largely reduced, and the inverse-transmitting time delay of the user face data is effectively shortened.
Description
Technical field
The present invention relates to wireless communication technology, be meant a kind of user face data inverse-transmitting method that switch the base station of realizing striding especially.
Background technology
Long Term Evolution (LTE; Long Term Evolution) in the block data system (EPS, Evolved Packet System), includes enhancement mode access network (E-UTRAN; Evolved UTRAN) and the packet core network of evolution (EPC, Evolved Packet Core).EPS has realized that wireless communication system by the transformation of traditional hierarchy to the flattening structure, simplified signaling process and system complexity greatly.
The transfer of data of subscriber equipment (UE, User Equipment) when switching is a critical technical problems.In order to realize the harmless transmission of data, practice thrift the Radio Resource of eating dishes without rice or wine, in handoff procedure, need the data that does not send as yet the source base station be handed to the target side base station processes, this operation is called data forwarding or data inverse-transmitting (Data Forwarding).
Concerning upstream; Switch when taking place; The PDCP of source base station (eNB, evolved Node B) (PDCP, Packet Data Convergence Protocol) layer is with the orderly up PDCP service data unit (SDU that successfully receives; Service Data Unit) sends to gateway (S-GW, Serving Gateway); And the out of order up PDCP SDU that will receive is forwarded to the target side base station, and up PDCP SDU accomplishes to submitting according to the order of sequence by the reordering function of target side base station PDCP layer of gateway.
Concerning downstream data flow, when switch taking place, the source base station can with below several kinds of messages be forwarded to the target side base station:
The PDCP layer does not send the pairing SDU of successful PDCP protocol Data Unit (PDU, Protocol Data Unit), and carries PDCP sequence number (SN).Wherein, do not send be meant successfully that Radio Link control (RLC, Radio Link Control) layer does not send or affirmation mode (AM, Acknowledged Mode) under do not receive the affirmation message of UE.
Passed through the processing of PDCP layer, but the pairing SDU of PDCP PDU that sends of when switch taking place, also not having enough time, and carry the PDCP sequence number.
Descending initial data and user plane GPRS (GPRS) tunnel protocol (GTPU from core network S1 interface; GPRS Tunnelling Protocol for User Plane) layer PDU that does not have enough time to send; Promptly this message is handled without the PDCP layer; At this moment, do not carry the PDCP sequence number.
In the prior art, when switching, each layer of source base station will need the data of anti-pass to the high level report and through reverse process, finally obtain the anti-pass message of GTPU layer.Concrete processing procedure is following: when switching, the data of sending to UE will not accomplished in the source base station, after PDCP layer and rlc layer processing, give GTPU layer respectively, finally be sent to the target side base station through the anti-pass tunnel.Not accomplishing the data of sending to UE comprises: the PDCP layer is not transferred to the PDCP PDU of rlc layer; Rlc layer does not send to the PDU of the user plane rlc layer of UE; And do not obtain the RLC PDU that UE confirms when adopting the AM pattern.
For in handoff procedure to these messages of target side base station anti-pass; Must message be submitted to high level by low layer; Through the reverse resolution of upper-layer protocol layer, the GTPU layer through transport network layer (TNL, Transport Network Layer) is sent to the target side base station then; At this moment, the flow direction of message is just opposite with downstream data flow.
The problem of handling like this is: data need be handled through rollback when anti-pass, reverse resolution, make that the data processing path is long, have increased the time delay in switching greatly.Do not receive that with rlc layer the message of UE confirmation of receipt message is an example, when this message carries out anti-pass, at first need pass through the PDCP layer go PDCP packet header, deciphering, head to decompress etc. just to give the GTPU layer carry out anti-pass.
And the encryption and decryption of user plane PDCP layer and decompression algorithm are very consuming time, and empirical data shows, head compression scheduling algorithm introducing can bring the performance of user plane to descend 30% at least.In addition, to duplicate also be inevitable to the message between protocal layers.Therefore, the protocol processes of repetition and interlayer data are duplicated the time delay that has increased hand-off process greatly.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of user face data inverse-transmitting method that switch the base station of realizing striding, and effectively shortens the processing delay of striding in the switching of base station.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of realization striden the user face data inverse-transmitting method that switch the base station, and this method comprises:
User plane receives data, and at the protocol Data Unit PDU of high-rise stored messages, and the notice low layer carries out protocol processes to message;
Wherein, said user plane receives data, comprising: successively set up the mapping relations between the message of user plane GPRS tunnel protocol GTPU layer, PDCP PDCP layer, Radio Link control rlc layer.
Said at high-rise stored messages PDU and notify low layer that message is carried out protocol processes, comprising: the GTPU layer is stored the GTPU PDU of this layer message, and notice PDCP layer carries out message and handles; The PDCP layer reads the GTPU PDU of GTPU layer, notes the index value of this GTPU PDU in GTPU layer Buffer Pool, converts GTPU PDU into PDCP PDU and storage, and the notice rlc layer carries out message to be handled; Rlc layer is assembled into RLC PDU with PDCP PDU, and according to the border report of PDCP layer, the bounds of record PDCPPDU is sent to lower floor with RLC PDU then;
After message sends successfully, high-rise delete the PDU of corresponding message according to the triggering of low layer, comprising: rlc layer triggers PDCP layer deletion PDCP PDU; The PDCP layer is deleted PDCP PDU storage, success transmission according to the triggering and the mapping relations of rlc layer, and triggers GTPU layer deletion GTPU PDU; The GTPU layer is deleted GTPU PDU storage, success transmission according to the triggering and the mapping relations of PDCP layer;
When switching; The high level of source base station sends the PDU of message storage, that need anti-pass to the target side base station; Comprise: the PDCP layer triggers the anti-pass action of GTPU layer, reports index value and the corresponding PDCP sequence number of the GTPU PDU of needs anti-pass according to said mapping relations; The GTPU layer is retrieved the GTPU PDU of this layer storage according to the triggering of PDCP layer, will be packaged into the anti-pass data corresponding to the GTPU PDU of said index value, is sent to the target side base station through the X2 interface tunnel then.
Saidly be sent to the target side base station, further comprise: the PDCP sequence number of correspondence is carried in the extension header of GTPU and offers target BS through the X2 interface tunnel.
This method further comprises: the GTPU PDU that the GTPU layer does not have enough time in the time of will switching to notify the PDCP layer to handle is sent to the target side base station.
This method further comprises: the initial data that the GTPU layer will come from core network directly is sent to the target side base station.
In the scheme provided by the invention, user plane receives data, and at the PDU of high-rise stored messages, and the notice low layer carries out protocol processes to message; After message sends successfully, the high-rise PDU that deletes corresponding message according to the triggering of low layer; When switching; The high level of source base station sends the PDU of message storage, that need anti-pass to the target side base station, like this, and when data need anti-pass; Through interlock high-rise and low layer; Directly data are sent to the target side base station, have shortened the data processing path greatly, and then reduce the processing delay of striding in the switching of base station significantly by high level.
Under the prerequisite of following the existing protocol regulation; Move to the GTPU layer of TNL in the data inverse-transmitting operation during with switching; Data lossless transmission in the time of can realizing switching; Can effectively reduce the data inverse-transmitting time delay again, the protocol processes and the interlayer data that significantly reduce repetition are duplicated, and have effectively shortened the time delay of user face data inverse-transmitting.
Description of drawings
Fig. 1 is for striding the user face data inverse-transmitting flow chart that switch the base station among the present invention;
Fig. 2 is source base station processes flow chart before switching among the present invention;
Fig. 3 is source base station processes flow chart when switching among the present invention;
Message was handled the path sketch map when Fig. 4 A strode the base station switching for having now;
Message was handled the path sketch map when Fig. 4 B switched for striding the base station among the present invention.
Embodiment
Among the present invention, user plane receives data, and at the PDU of high-rise stored messages, and the notice low layer carries out protocol processes to message; After message sends successfully, the high-rise PDU that deletes corresponding message according to the triggering of low layer; When switching, the high level of source base station sends the PDU of message storage, that need anti-pass to the target side base station.
Fig. 1 is for striding the user face data inverse-transmitting flow chart that switch the base station among the present invention, and is as shown in Figure 1, and the implementation procedure of striding the user face data inverse-transmitting that switches the base station may further comprise the steps:
Step 101: when user plane receives data, successively set up the mapping relations between the message of GTPU layer, PDCP layer, rlc layer.The base station that different manufacturers is produced, the concrete mode of setting up mapping relations can be different.
Successively set up the mapping relations between the message, can be the PDU of higher layer protocol entities stored messages, and the notice low layer handles message, simultaneously the location index of this message at Buffer Pool also attached in message information; The lower layer protocol entity writes down this location index after receiving message, and is associated with this layer PDU after handling.In this implementation, each layer protocol entity can be set up mapping relations between message.Preserved the copy of low layer SDU in the Buffer Pool of higher layer entities, the anti-pass in the time of can being used to switch at any time.
Successively set up the mapping relations between the message, also can for: low layer when handling message, set up the mapping relations of interlayer message if desired, through calling interlayer interface obtains corresponding high-rise message according to position indicator pointer information; After low layer sent and finishes, the useless PDU of deletion low layer called the message deletion action that interlayer interface triggers higher layer protocol entities simultaneously, and the message of correspondence is deleted.In this implementation, when setting up mapping relations, the message deletion action of each layer protocol entity is reached synchronously, do not need guarantee the copy of anti-pass no longer to be preserved.
Step 102: when switching, the GTPU layer is according to the GTPU PDU of mapping relations to the anti-pass of target BS transmission needs.
Step 103:GTPU layer directly sends the initial data from core network to the target side base station, because this initial data is sent on the GTPU layer, therefore is GTPU PDU.
Step 104: the target side base station receives for the GTPU PDU from source base station GTPU layer.
Fig. 2 is for source base station processes flow chart before switching among the present invention, and is as shown in Figure 2, and the concrete processing of source base station may further comprise the steps before switching:
Step 201:GTPU layer is stored the GTPU PDU of this layer message, and the notice PDCP of lower floor layer carries out the message processing.
Step 202:PDCP layer reads the GTPU PDU of GTPU layer, notes the index value of this GTPU PDU in GTPU layer Buffer Pool; Convert GTPU PDU into PDCP PDU and storage; Notice lower floor rlc layer carries out message to be handled.
Step 203:RLC layer is assembled into RLC PDU with PDCP PDU, and according to the border report of PDCP layer, the bounds of record PDCP PDU to confirm the particular location of RLC PDU in message PDCP PDU, is sent to lower floor with RLC PDU then.
Fig. 3 is source base station processes flow chart when switching among the present invention, and as shown in Figure 3, the concrete processing of source base station may further comprise the steps when switching:
Step 301: switch when taking place, the PDCP layer triggers the anti-pass action of GTPU layer, reports index value and the corresponding PDCP sequence number of the GTPU PDU of needs anti-pass according to mapping relations.
Step 302:GTPU layer is according to the triggering of PDCP layer; Retrieve the GTPU PDU of this layer storage; To be packaged into the anti-pass data corresponding to the GTPU PDU of index value; Be sent to the target side base station through the X2 interface tunnel then, and the PDCP sequence number of correspondence be carried in the extension header of GTPU and offer target BS.
The GTPU PDU that step 303:GTPU layer does not have enough time in the time of will switching to notify the PDCP layer to handle is sent to the target side base station through the X2 interface tunnel.
Step 304: the initial data that the GTPU layer of source base station will come from core network S1 interface directly is sent to the target side base station through the X2 interface tunnel of GTPU layer.
Through existing Fig. 4 A, Fig. 4 B will have scheme now and implementation of the present invention compares, and can fully give prominence to the present invention program's superiority.
In the prior art, shown in Fig. 4 A, the reverse process that the acquisition of the anti-pass message of GTPU layer will be passed through protocal layers, the data processing path is long.Do not receive that with rlc layer the message of UE confirmation of receipt message is an example, that pass through the PDCP layer goes to PDCP packet header, deciphering, and head decompresses to wait and just can give the GTPU layer and carry out anti-pass.The encryption and decryption of user plane PDCP layer and header compression algorithm are very consuming time, and empirical data shows that the introducing of head compression scheduling algorithm can bring the decreased performance of user plane at least 30%.To duplicate also be inevitable to message between protocal layers in addition.Therefore, the protocol processes of repetition and interlayer data are duplicated has increased the hand-off process time delay greatly.
In the embodiment of the present invention, shown in Fig. 4 B, through setting up the mapping relations of interlayer message; Move to the GTPU layer of TNL in the data inverse-transmitting operation during with switching, and handle the processing path of having shortened the anti-pass data effectively through the interlock of PDCP and GTPU; Avoided the interlayer data to duplicate and reverse protocol processes; Thereby can effectively shorten the data inverse-transmitting time delay when striding the base station switching, accelerate switching flow, strengthen user experience.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (4)
1. the user face data inverse-transmitting method that switch the base station is striden in a realization, it is characterized in that this method comprises:
User plane receives data, and at the protocol Data Unit PDU of high-rise stored messages, and the notice low layer carries out protocol processes to message;
Wherein, said user plane receives data, comprising: successively set up the mapping relations between the message of user plane GPRS tunnel protocol GTPU layer, PDCP PDCP layer, Radio Link control rlc layer;
Said at high-rise stored messages PDU and notify low layer that message is carried out protocol processes, comprising: the GTPU layer is stored the GTPU PDU of this layer message, and notice PDCP layer carries out message and handles; The PDCP layer reads the GTPU PDU of GTPU layer, notes the index value of this GTPU PDU in GTPU layer Buffer Pool, converts GTPU PDU into PDCP PDU and storage, and the notice rlc layer carries out message to be handled; Rlc layer is assembled into RLC PDU with PDCP PDU, and according to the border report of PDCP layer, the bounds of record PDCPPDU is sent to lower floor with RLC PDU then;
After message sends successfully, high-rise delete the PDU of corresponding message according to the triggering of low layer, comprising: rlc layer triggers PDCP layer deletion PDCP PDU; The PDCP layer is deleted PDCP PDU storage, success transmission according to the triggering and the mapping relations of rlc layer, and triggers GTPU layer deletion GTPU PDU; The GTPU layer is deleted GTPU PDU storage, success transmission according to the triggering and the mapping relations of PDCP layer;
When switching; The high level of source base station sends the PDU of message storage, that need anti-pass to the target side base station; Comprise: the PDCP layer triggers the anti-pass action of GTPU layer, reports index value and the corresponding PDCP sequence number of the GTPU PDU of needs anti-pass according to said mapping relations; The GTPU layer is retrieved the GTPU PDU of this layer storage according to the triggering of PDCP layer, will be packaged into the anti-pass data corresponding to the GTPU PDU of said index value, is sent to the target side base station through the X2 interface tunnel then.
2. method according to claim 1 is characterized in that, saidly is sent to the target side base station through the X2 interface tunnel, further comprises: the PDCP sequence number of correspondence is carried in the extension header of GTPU and offers target BS.
3. method according to claim 1 is characterized in that, this method further comprises: the GTPU PDU that the GTPU layer does not have enough time in the time of will switching to notify the PDCP layer to handle is sent to the target side base station.
4. according to claim 1 or 3 described methods, it is characterized in that this method further comprises: the initial data that the GTPU layer will come from core network directly is sent to the target side base station.
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| CN2008102247126A CN101754304B (en) | 2008-12-09 | 2008-12-09 | User face data inverse-transmitting method for realizing the switching across base station |
| PCT/CN2009/074082 WO2010066148A1 (en) | 2008-12-09 | 2009-09-21 | Method and device for forwarding user plane data to enable crossing base station handover |
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| CN2008102247126A CN101754304B (en) | 2008-12-09 | 2008-12-09 | User face data inverse-transmitting method for realizing the switching across base station |
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| CN102223669B (en) * | 2011-06-24 | 2018-06-12 | 中兴通讯股份有限公司 | It creates data inverse-transmitting channel and distributes the method and system of Internet protocol |
| CN102413455B (en) * | 2011-12-22 | 2014-01-15 | 北京北方烽火科技有限公司 | GTP-U (General Tunneling Protocol-User) data forwarding method |
| CN104106283B (en) * | 2012-08-31 | 2018-08-21 | 华为技术有限公司 | Data transmission method, user equipment and the base station of wireless network |
| EP3554129B1 (en) | 2013-04-16 | 2023-06-07 | Huawei Technologies Co., Ltd. | Cell handover method and device |
| CN107734546B (en) * | 2016-08-12 | 2022-10-28 | 中兴通讯股份有限公司 | Mapping method, device and system of user plane data |
| CN112514450B (en) * | 2018-11-29 | 2024-01-05 | Oppo广东移动通信有限公司 | Data processing method, device and storage medium |
| CN111935745B (en) * | 2020-08-12 | 2024-04-12 | 太仓市同维电子有限公司 | Method for realizing terminal cross-base station mobile performance optimization |
| CN114401302B (en) * | 2022-03-02 | 2023-05-16 | 清华大学 | Linkage action execution method, linkage action execution device and storage medium |
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Application publication date: 20100623 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: User face data inverse-transmitting method for realizing the switching across base station Granted publication date: 20121128 License type: Common License Record date: 20151123 |
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