CN102404809A - Method and system for transferring data transmission channel - Google Patents
Method and system for transferring data transmission channel Download PDFInfo
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- CN102404809A CN102404809A CN2010102863939A CN201010286393A CN102404809A CN 102404809 A CN102404809 A CN 102404809A CN 2010102863939 A CN2010102863939 A CN 2010102863939A CN 201010286393 A CN201010286393 A CN 201010286393A CN 102404809 A CN102404809 A CN 102404809A
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Abstract
The invention discloses a method and a system for transferring a data transmission channel. The method includes: after user equipment is rebuilt in a target base station, and the target base station sends a signal for requesting for path transfer to a core network; and the core network transfers the data transmission channel of the user equipment to a data transmission channel between the core network and the target base station after receiving the signal. The effect that a new subdistrict where the UE is rebuilt can provide service for the UE is achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of data transmission channel moving method and system.
Background technology
Along with the development of network architecture flattening and the appearance of the removable access way of multiple high-speed wideband; The wireless communication system of evolution not only can provide higher transmission rate, shorter transmission delay and lower cost; Can also support third generation partnership project (Third Generation Partnership Projects; Abbreviation 3GPP) mobility between the inner connecting system and the mobility between 3GPP connecting system and the non-3GPP connecting system etc., thus impel GSM to propose framework theory of future generation.
Fig. 1 is Long Term Evolution (the Long Time Evolution according to correlation technique; Abbreviate LTE as) sketch map of station layout under the framework; As shown in Figure 1, the base station (eNodeB of the architecture evolution of future generation of the LTE/ System Architecture Evolution (System Architecture Evolution abbreviates SAE as) that cordless communication network proposes; Abbreviate eNB as) form the Radio Access Network (Evolved Radio Access Network abbreviates E-RAN as) of evolution; The packet core network of evolution is made up of Mobility Management Entity (Mobility Management Entity abbreviates MME as) and gateway (Serving Gateway abbreviates S-GW as) entity.Interface between eNB and the core network is the S1 interface, and wherein, the interface between eNB and the MME is expressed as S1-MME, is used to accomplish the chain of command function of mobile management and S1 interface; Interface between eNB and the S-GW is expressed as S1-U, is used to accomplish the function such as route, transmission of user data.Link to each other through X2 interface between the eNB, X2 interface is used to accomplish the information interaction between the eNB of mobile management function and the equity of subscriber equipment (User Equipment abbreviates UE as) under state of activation.
In the LTE system; Integrity for GSM; When UE detect Radio Link Failure, handoff failure, bottom detect integrity protection inspection failure maybe can not satisfy wireless connections reshuffle (RRC Connection Reconfiguration, wherein, RRC is Radio Resource control; Promptly; Radio Resource Control) under the situation such as requirement, introduced the thought of wireless connections reconstructions (RRC Connection Re-establishment), UE need carry out the process of cell selecting (suitable cell of selection was called new sub-district so that select proper cell this moment; This new sub-district can be the connect sub-district at place of former UE, also can be other sub-district) initiate the flow process that wireless connections are rebuild.The fail safe that a prerequisite of UE initiation RRC connection reconstruction is an Access Layer must be activated, if the fail safe of Access Layer is not activated at this moment, then UE can not carry out the RRC connection reconstruction, but directly gets into Idle state.
Fig. 2 is the flow chart according to the LTE system wireless connection reconstruction of correlation technique, and is as shown in Figure 2, and wireless connections are rebuild concrete flow process and comprised that following step S201 is to step S203:
Step S201:UE sends wireless connections in new sub-district to the base station and rebuilds request (RRC Connection Reestablishment Request) signaling; And carry therein to rebuild and trigger Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (the Cell Radio Network Temporary Identifier that preceding UE uses; Abbreviate C-RNTI as), rebuild to trigger before the UE place former sub-district Physical Cell Identifier (Physical Cell Identifier abbreviates PCI as), brachymemma message integrity authentication code (short MAC-I) and rebuild information such as reason.
Step S202: the base station is for after this UE distributes required Radio Resource; Send wireless connections to this UE and rebuild (RRC Connection Reestablishment) signaling; This signaling comprises the parameter that the base station is the Signaling Radio Bearer (Signaling Radio Bearer abbreviates SRB as) of UE configuration.
Step S203:UE disposes new parameter after receiving the wireless connections reconstruction signaling of sending the base station, sends wireless connections to the base station and rebuilds completion (RRC Connection Reestablishment Complete) signaling.
After completion is rebuild in wireless connections; UE has rebulid in new sub-district and has been used for the dedicated channel SRB that signaling is transmitted; Then, UE need set up the dedicated channel data radio bearer (Data Radio Bearer abbreviates DRB as) that is used for data passes and carries out transfer of data.If former sub-district, place belonged to a base station together before new sub-district of selecting when UE rebuilds and UE triggered and rebuild; Then original GPRS (General Packet Radio Service that between this base station and core net, sets up for this UE; Abbreviating GPRS as) tunnel protocol (GPRS tunneling protocol abbreviates GTP as) tunnel (GTP Tunnel) can continue to use; If former sub-district, place belonged to different base stations before new sub-district of selecting when UE rebuilds and UE triggered and rebuild; Continue to use this UE then can have problems at the GTP tunnel between base station and the core net under the former sub-district; Because core net also can send to the downlink data of this UE the base station under the former sub-district; The new sub-district of selecting when UE rebuilds can not obtain the downlink data of UE, also just can not continue as UE service is provided.For this problem, prior protocols does not provide processing method.
Summary of the invention
Main purpose of the present invention is to provide a kind of data transmission channel migration scheme, to solve the problem that UE is reconstructed in the above-mentioned correlation technique new sub-district can not obtain the downlink data of UE so that service can not be provided for this UE at least.
To achieve these goals, according to an aspect of the present invention, a kind of data transmission channel moving method is provided.This method comprises: after subscriber equipment was reconstructed into target BS, target BS sent the signaling of request path migration to core net; Core net is moved to the data transmission channel between core net and the target BS with the data transmission channel of subscriber equipment after receiving signaling.
Further, data transmission channel comprises descending general packet wireless service tunnel protocol tunnel and/or up general packet wireless service tunnel protocol tunnel.
Further; Before target BS sends the signaling of request path migration to core net; This method also comprises: receive at target BS before the wireless connections reconstruction request of subscriber equipment transmission, target BS obtains the contextual information of subscriber equipment through X2 interface signaling or S1 interface signaling.
Further, before target BS sent the signaling of request path migration to core net, this method also comprises: target BS was a subscriber equipment reconfiguration data radio bearer.
Further, after the data transmission channel of subscriber equipment was moved to the data transmission channel between core net and the target BS, this method also comprised: core net is returned the response of request path migration to target BS; Comprise core net in the response and be the up list information of RAB of new S1 Application Part sign and the migration of user equipment allocation.
Further, the signaling of request path migration is path migration request, reconstruction notice signaling or switching notice signaling.
Further, the signaling of request path migration comprises following information one of at least: Mobility Management Entity be user equipment allocation S1 Application Part sign, needs migration RAB sign and Target Cell Identifier that address information, subscriber equipment are rebuild, trigger the reason that move in the path.
To achieve these goals, according to another aspect of the present invention, a kind of data transmission channel migratory system is provided, this system comprises: target BS, be used for after subscriber equipment is reconstructed into target BS, and send the signaling of request path migration to core net; Core net is used for after receiving signaling, and the data transmission channel of subscriber equipment is moved to the data transmission channel between core net and the target BS.
Further, target BS is used for before request is rebuild in the wireless connections that receive the subscriber equipment transmission, obtaining the contextual information of subscriber equipment through X2 interface signaling or S1 interface signaling.
Further, target BS is used for before sending the signaling of request path migration to core net, being subscriber equipment reconfiguration data radio bearer.
Further, core net is used for the data transmission channel of subscriber equipment is moved to after the data transmission channel between core net and the target BS, returns the response of request path migration to target BS.
Through the present invention; After adopting UE to be reconstructed into target BS; Target BS sends the signaling that request path moves to core net, then, and the mode of the data transmission channel of core net migration UE; Solve UE is reconstructed in the correlation technique new sub-district and can not obtain the downlink data of UE so that the problem of service can not be provided for this UE, and then reached the effect that new sub-district behind the new sub-district that UE is reconstructed into can provide data, services for UE.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map according to the station layout under the LTE framework of correlation technique;
Fig. 2 is the flow chart according to the LTE system wireless connection reconstruction of correlation technique;
Fig. 3 is the flow chart according to the data transmission channel moving method of the embodiment of the invention;
Fig. 4 rebuilds the sketch map of back in the flow process of new cell recovery transfer of data according to the UE of the embodiment of the invention one;
Fig. 5 rebuilds the sketch map of back in the flow process of new cell recovery transfer of data according to the UE of the embodiment of the invention two; And
Fig. 6 is the structured flowchart according to the data transmission channel migratory system of the embodiment of the invention.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
The embodiment of the invention provides a kind of data transmission channel moving method.Fig. 3 is the flow chart according to the data transmission channel moving method of the embodiment of the invention, and is as shown in Figure 3, and this method comprises:
Step S302, after UE was reconstructed into target BS, target BS sent the signaling of request path migration to core net;
Step S304, core net is moved to the data transmission channel between core net and the target BS with the data transmission channel of UE after receiving this signaling.
For example, core net can send to target BS with the data of UE, sends to UE through target BS again, and no longer the data of this UE is sent to source base station.
Among this embodiment; After UE is reconstructed into target BS; Target BS can send the signaling of request path migration to core net; Thereby the data transmission channel of UE is moved to the data transmission channel between core net and the target BS, solved the problem that UE is reconstructed in the correlation technique new sub-district can not obtain the downlink data of UE so that service can not be provided for this UE, reached the effect that new sub-district behind the new sub-district that UE is reconstructed into can provide data, services for UE.
Wherein, above-mentioned data transmission channel can comprise: descending general packet wireless service tunnel protocol tunnel and/or up general packet wireless service tunnel protocol tunnel.Before UE did not trigger the wireless connections reconstruction, this data transmission channel was meant the source base station at UE place and the data transmission channel between the core net; After UE rebuild, data transmission channel was meant the data transmission channel between core net and the target BS.This shows, can move data feedback channel and/or the down going channel of UE in the present embodiment, make the transmitting uplink data of UE and downlink data transmission effectively to carry out.
In an implementation of the present invention; Receive at target BS before the wireless connections reconstruction request of UE transmission; Target BS can obtain the contextual information of this UE through X2 interface signaling or S1 interface signaling, thereby can judge whether to accept the reconstruction request of this UE according to this contextual information.
Preferably, before target BS sent the signaling of request path migration to core net, target BS was a UE reconfiguration data radio bearer earlier.This embodiment is practical.
In another implementation of the present invention, after the data transmission channel of the subscriber equipment of subscriber equipment was moved to the data transmission channel between core net and the target BS, core net also can be returned the response of request path migration to target BS; Comprise core net in this response and be the up list information of RAB of new S1 Application Part sign and the migration of user equipment allocation.Through this embodiment, target BS can confirm whether data transmission channel is successful.
Preferably, the signaling of above-mentioned request path migration is path migration request, reconstruction notice signaling or switching notice signaling.This embodiment has proposed several kinds of signalings that can be used for the path migration, and is workable.
Preferably, the signaling of request path migration comprises following information one of at least: Mobility Management Entity be the RAB of the UE S1 Application Part sign of distributing, needs migration sign and Target Cell Identifier that address information, UE rebuild, trigger the reason that move in the path.This embodiment provides the signaling of path migration to comprise the content of information, and practicality is stronger.
To combine accompanying drawing that the implementation procedure of the embodiment of the invention is described in detail below.
Embodiment one
In the LTE system; There is X2 interface between base station 1 and the base station 2; UE is positioned at the sub-district 1 under the base station 1, and is in connection status, and for this UE set up the S1 that be used for command transmitting and data be connected (UE-associated logical S1-connection) between base station 1 and the core net this moment.
The UE that is in connection status receives the measurement configuration that send base station 1, carries out measurement and reporting measurement reports to satisfy Interference Control and mobility demand.Sometime, this UE is to the signal quality of base station 1 reporting subdistrict 2 measurement report than the high predetermined offset of signal quality of Serving cell (that is, sub-district 1), and sub-district 2 belongs to base station 2.Handover decisions is made in base station 1 after the measurement report that receives from UE, hope switches to sub-district 2 with this UE.Yet; In the process of switching, UE rebuilds owing to reasons such as Radio Link Failure or RRC connection reconfiguration failure trigger, at this moment; UE selects sub-district 2 as the new sub-district that rebuilds; Fig. 4 rebuilds the sketch map of back in the flow process of new cell recovery transfer of data according to the UE of the embodiment of the invention one, and as shown in Figure 4, this flow process comprises:
Step S401, UE is to the signal quality of base station 1 reporting subdistrict 2 measurement report than the high predetermined offset of signal quality of Serving cell.In the present embodiment, base station 1 is called source base station.
Step S402a, handover decisions is made in base station 1, selects sub-district 2 as the Target cell that switches; Base station 1 is sent handoff request (Handover Request) through X2 interface to base station 2 (that is, target BS), wherein comprises the contextual information of UE; For example; Can comprise the Physical Cell Identifier, UE of UE Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, cell-of-origin of (that is, Serving cell, sub-district 1) in the cell-of-origin at the encryption key KeNB* of Target cell, UE at reconstruction information (Reestablishment Info) of Target cell etc.; Wherein, reconstruction information comprises brachymemma message integrity authentication code (short MAC-I).Also can comprise Target cell in the handoff request.
Step S403a, access control is implemented according to the contextual information of UE in base station 2 after receiving handoff request, be this UE Resources allocation, and return Handover Request Acknowledge (Handover Request Acknowledge) to base station 1.
UE makes switching flow interrupt owing to trigger reconstruction, forwards step S402b to.Because handoff, so base station 1 possibly not receive the Handover Request Acknowledge that send base station 2, even perhaps Handover Request Acknowledge is received in base station 1, also do not have to accomplish to UE and sends switching command.
Step S402b, UE owing to detect Radio Link Failure, integrity protection inspection failure, maybe can not satisfy the requirement that wireless connections are reshuffled, thereby have triggered the wireless connections reconstruction after step S401.This UE carries out cell selecting, selects sub-district 2 as the new sub-district that rebuilds.UE reads the system message of sub-district 2 (Cell 2).
Step S403b; 2 initiations insert UE at random in the sub-district; Send RRC connection reconstruction request (RRC Connection Reestablishment Request) message to base station 2; Short MAC-I, the UE that in RRC connection reconstruction request message, can comprise UE calculating trigger physical layer identifications (the Physical Cell Identifier of the sub-district at place when rebuilding; Abbreviate PCI as) and Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (Cell Radio Network Temporary Identifier abbreviates C-RNTI as).
Step S404b; Base station 2 after receiving the RRC connection reconstruction request message that UE sends, the corresponding shortMAC-I that self preserves according to the C-RNTI that carries in the message and PCI inquiry, and the short MAC-I that carries in the short MAC-I of inquiry and the message compared; Judge whether the two is consistent; If consistent, then the RRC connection reconstruction request of this UE is accepted in base station 2, and sends RRC connection reconstruction (RRC Connection Reestablishment) message to UE; If inconsistent, the then RRC connection reconstruction request of base station 2 these UE of refusal.Base station 2 can obtain the contextual information of UE in receiving the handoff request of sending base station 1; Wherein comprise UE at reconstruction information (Reestablishment Info) of Target cell etc.; Therefore, can verify the authenticity of this UE, whether decision is accepted it and is rebuild request.
Step S405b, UE dispose new parameter after receiving the wireless connections reconstruction signaling of sending base station 2, and send wireless connections to base station 2 and rebuild completion (RRC Connection Reestablishment Complete) signalings.This moment, UE accomplished the reconstruction of SRB.
Step S406b; Base station 2 is sent the RRC connection to UE and is reshuffled (RRC Connection Reconfiguration); Wherein comprise configuration information, measurement configuration information of DRB (can a more than DRB, this depends on the DRB number that comprises in the contextual information of UE) etc.Because UE has been reconstructed into new sub-district; The radio link configuration parameter that UE adopts in the cell-of-origin can not be applied to new sub-district; Base station 2 need connect reprovision through RRC and be changed to this UE and distribute new air-link resources, so as UE normally the restore data radio bearer with Data transmission.
Step S407b, UE receive RRC connect reshuffle after, use configuration parameter wherein, return RRC to base station 2 and connect and reshuffle completion (RRC Connection Reconfiguration Complete).
Step S408b, base station 2 receive RRC connect reshuffle completion after, know that UE has successfully rebuild DRB.In order to make UE can keep transfer of data (uplink and downlink); The signaling of request path migration is sent in base station 2 to core net; In the signaling of request path migration, comprise sign (E-UTRAN Radio Access Bearer Identifier abbreviates E-RAB ID as) and the address information (comprising transport layer address Transport layer address and GTP tunnel terminal iidentification GTP-TEID) of S1 Application Part sign (Source MME UE S1AP ID) that Mobility Management Entity distributes for this UE, RAB that needs move, the Target Cell Identifier of UE reconstruction.The path migration request (Path Switch Request) of the signaling of request path migration in can multiplexing existing protocol also can adopt newly-increased S1 interface signaling, for example rebuilds migration request.Need to prove that the RAB that needs migration is corresponding to DRB among the step S406b, the corresponding DRB of a RAB (E-UTRAN Radio Access Bearer abbreviates E-RAB as).
Step S409b; Core net is after the signaling that receives the request path migration, and according to the S1 Application Part sign that core net was wherein distributed for this UE originally, retrieval obtains the configuration parameter of this UE; For this UE distributes new S1 Application Part sign, move the descending GTP tunnel of this UE simultaneously.Then; Core net is sent response to base station 2; Comprising core net in this response is the new S1 Application Part sign (MME UE S1AP ID) that UE distributes, and also comprises the up list information (E-RAB To Be Switched in Uplink List) of the RAB of migration.
So far; UE accomplishes reconstruction, can successfully continue transfer of data, because through step S408b and S409b; Recovered the GTP tunnel (GTP Tunnel) of this UE between base station 2 and the core net; Make the downlink data of this UE of core-network side can arrive base station 2 smoothly, and 2 send to UE through eating dishes without rice or wine through the base station, the processing of upstream data in contrast.
In the present embodiment, switching flow carried out before rebuilding flow process, as long as base station 2 has obtained the contextual information of this UE when receiving the RRC connection reconstruction request that UE sends, rebuild flow process and can accomplish.In the network of reality, source base station can be issued base stations neighboring in advance with the contextual information of UE and (not be based on the consideration of handover decisions from the reconstruction that UE possibly trigger; Promptly; Do not send the contextual information of this UE through the signaling of handoff request), so just can guarantee that the reconstruction of UE is succeedd, can carry on business; Avoid causing the connection of UE to discharge, influence user's experience because UE is reconstructed into the base station of this UE contextual information not.
Embodiment two
In the LTE system; There is not X2 interface between base station 1 and the base station 2; UE is positioned at the sub-district 1 under the base station 1; And be in connection status, at this moment, be connected (UE-associated logical S1-connection) between base station 1 and the core net for this UE has set up the S1 that is used for command transmitting and data.
The UE that is in connection status receives the measurement configuration that send base station 1, carries out measurement and reporting measurement reports to satisfy Interference Control and mobility demand.Sometime, UE is to the signal quality of base station 1 reporting subdistrict 2 measurement report than the high predetermined offset of signal quality of Serving cell (sub-district 1), and sub-district 2 belongs to base station 2.Handover decisions is made in base station 1 after receiving the measurement report of UE, hope UE is switched to sub-district 2.Yet; In the process of switching; The reason such as reconfiguration failure that UE connects owing to Radio Link Failure or RRC triggers and rebuilds, and UE selects sub-district 3 (also belonging to base station 2) as the new sub-district that rebuilds, and Fig. 5 is that the UE according to the embodiment of the invention two rebuilds the sketch map of back in the flow process of new cell recovery transfer of data; As shown in Figure 5, this flow process comprises:
Step S501, UE is to the signal quality of base station 1 reporting subdistrict 2 measurement report than the high predetermined offset of signal quality of Serving cell.In the present embodiment, base station 1 is called source base station.
Step S502a; Handover decisions is made in base station 1; Select sub-district 2 as the Target cell that switches, handoff requirement (Handover Required) is sent to core net in base station 1, wherein comprises the contextual information of UE; For example; Can comprise the Physical Cell Identifier, UE of UE Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, cell-of-origin of (Serving cell, sub-district 1) in the cell-of-origin at the encryption key KeNB* of Target cell, UE at reconstruction information (Reestablishment Info) of Target cell etc., reconstruction information comprises brachymemma message integrity authentication code (short MAC-I).Handoff requirement also comprises the sign of Target cell and target BS.
Step S503a, core net is sent handoff request to base station 2 after receiving handoff requirement.Comprise that in this handoff request core net is configuration parameter such as transport layer address, the GTP tunnel Endpoint ID (GTP Tunnel Endpoint Identifier) of UE new S1 Application Part sign (MME UE S1AP ID) of distributing and GTP tunnel.
Step S504a, access control is implemented according to the contextual information of UE in base station 2 after receiving handoff request, be the UE Resources allocation, and return Handover Request Acknowledge (Handover Request Acknowledge) to core net.
Step S505a, core net is sent switching command (Handover Command) to base station 1.
UE makes switching flow interrupt owing to trigger reconstruction, forwards step S502b to.Because handoff, so base station 1 possibly not receive the switching command that core net is sent, even perhaps switching command is received in base station 1, also do not have to accomplish to UE and sends switching command.
Step S502b, UE owing to detect Radio Link Failure, integrity protection inspection failure, maybe can not satisfy the requirement that wireless connections are reshuffled, thereby have triggered the wireless connections reconstruction after step S501.UE carries out cell selecting, selects sub-district 3 as the new sub-district that rebuilds.UE reads the system message of sub-district 3 (Cell 3).
Step S503b; 3 initiations insert UE at random in the sub-district; Send RRC connection reconstruction request (RRC Connection Reestablishment Request) message to base station 2, the short MAC-I, the UE that in RRC connection reconstruction request message, comprise UE calculating trigger the PCI and the C-RNTI of the sub-district at place when rebuilding.
Step S504b; Base station 2 after receiving the RRC connection reconstruction request message that UE sends, the corresponding short MAC-I that self preserves according to the C-RNTI that carries in this message and PCI inquiry, and the short MAC-I that carries in the short MAC-I of inquiry and the message compared; Judge whether unanimity; If consistent, then the RRC connection reconstruction request of this UE is accepted in base station 2, and sends RRC connection reconstruction (RRC Connection Reestablishment) message to UE; If inconsistent, the then RRC connection reconstruction request of base station 2 these UE of refusal.Base station 2 can obtain the contextual information of UE from the handoff request that base station 1 (through core net) sent; Wherein comprise UE at reconstruction information (Reestablishment Info) of Target cell etc.; Therefore, the authenticity of this UE can be verified in base station 2, and whether decision is accepted it and rebuild request.
Step S505b, UE dispose new parameter after receiving the wireless connections reconstruction signaling of sending base station 2, and send wireless connections to base station 2 and rebuild completion (RRC Connection Reestablishment Complete) signalings.This moment, UE accomplished the reconstruction of SRB.
Step S506b; Base station 2 is sent the RRC connection to UE and is reshuffled (RRC Connection Reconfiguration); Wherein comprise configuration information, measurement configuration information of DRB (can a more than DRB, this depends on the DRB number that comprises in the contextual information of UE) etc.
Step S507b, UE receive RRC connect reshuffle after, use configuration parameter wherein, return RRC to base station 2 and connect and reshuffle completion (RRC Connection Reconfiguration Complete).
Step S508b; Base station 2 receive RRC connect reshuffle completion after; Know that UE has successfully rebuild DRB; In order to make UE can keep transfer of data (uplink and downlink); The signaling of request path migration is sent to core net in base station 2, and this signaling can be to rebuild notice, switching notice (Handover Notify) or other newly-increased S1 interface signalings, comprises in this signaling that core net identifies (MME UE S1AP ID) for the S1 Application Part that this UE distributes among the step S503a; Core net receives and knows that UE moved to base station 2 after the signaling that this request path switches, and can be used for the up-downgoing transfer of data of this UE between core net and the base station 2 for the GTP tunnel of this UE Data transmission.In the present embodiment, core net is not sent the response of request path migration, because core net realizes communicating by letter with base station 2 in step S503a, for this UE has disposed the relevant address information of RAB.
In the present embodiment; After UE is reconstructed into non-source base station jurisdiction district, if target BS, has also obtained the information such as S1 Application Part sign that core net is distributed for this UE through the contextual information of this UE of S1 hand off signaling acquisition; After target BS has been reshuffled the DRB of this UE; Target BS only need notify core net UE to move to target BS, and core net will stop to send to source base station the downlink data of this UE, then sends the downlink data of this UE to target BS.UE can commence business in the reconstruction continued like this.
In the present embodiment, switching flow carried out before rebuilding flow process, as long as base station 2 has obtained the contextual information of this UE when receiving the RRC connection reconstruction request that UE sends, rebuild flow process and can accomplish.In the network of reality, source base station can be issued base stations neighboring through the S1 signaling with the contextual information of UE in advance from the reconstruction that UE possibly trigger, and so just can guarantee that the reconstruction of UE is succeedd, and can carry on business.
Embodiment three
In the LTE system; There is X2 interface between base station 1 and the base station 2; UE is positioned at the sub-district 1 under the base station 1; And be in connection status, at this moment, be connected (UE-associated logical S1-connection) between base station 1 and the core net for this UE has set up the S1 that is used for command transmitting and data.
Succeed for the possible reconstruction of UE in base station 1; Therefore; Sent (comprising base station 2) contextual information of this UE to base stations neighboring through X2 interface; The contextual information of this UE comprise UE in the cell-of-origin Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, UE of (Serving cell, sub-district 1) at the encryption key KeNB* of Target cell, UE at reconstruction information (Reestablishment Info) of Target cell etc., reconstruction information comprises brachymemma message integrity authentication code (short MAC-I).Base station 1 can or be switched the contextual information of preparing this UE of signaling transmission through handoff request; Also can carry the contextual information of UE through newly-increased X2 interface signaling, send to the reconstruction of base stations neighboring with reply UE possibility (or potential).
UE selects adjacent base station (that is, target BS) jurisdiction district to rebuild because reasons such as Radio Link Failure trigger rebuilds, and can recover SRB through RRC connection reconstruction flow process, reshuffles flow process through the RRC connection and can recover DRB.Connect through RRC to reshuffle at target BS and accomplish after signaling knows that UE has recovered DRB; Target BS sends the signaling of request path migration to core net; In the signaling of request path migration, comprise sign (E-RAB ID, E-UTRAN Radio Access Bearer Identifier) and the address information (comprising transport layer address Transport layer address and GTP tunnel terminal iidentification GTP-TEID) of S1 Application Part sign (Source MME UE S1AP ID) that Mobility Management Entity distributes for this UE, RAB that needs move, the Target Cell Identifier of UE reconstruction.The path migration request of the signaling of request path migration in can multiplexing existing protocol also can adopt newly-increased S1 interface signaling as rebuilding migration request.In the signaling of request path migration, can increase the cell of reason, be used to show the reason that triggers the path migration, present embodiment Central Plains is because the reconstruction of UE.Need to prove, if UE has set up many RABs, and the equal cell recovery after UE rebuilds of these RABs, then the signaling of request path migration can comprise the sign and the corresponding address information of many RABs.
Correspondingly; Core net is after the signaling that receives the request path migration; Need return response to target BS, comprising core net is the up list information (E-RABs Switched in Uplink Item IEs) of the RAB of newly assigned S1 Application Part sign of UE and migration.Can continue as the transfer of data that this UE provides up-downgoing between core net and the target BS like this, guarantee that UE can carry on business.
In the present embodiment; Target BS can connect the signaling of moving to core net transmission request path in the flow process of reshuffling DRB at RRC; Promptly; Needn't wait until that RRC that target BS receives that UE sends connects and reshuffle the signaling of accomplishing the request path migration of redispatching after the signaling; Because target BS is that UE configuration DRB can succeed through the RRC signaling usually, the signaling that target BS sends the request path migration in advance can make downlink data arrive target BS faster, can send to UE as soon as possible.If UE can not use the RRC connection and reshuffle (being that not success is reshuffled in the RRC connection), target BS can be subsequently to the request of core net transmission release RAB, and asking core net to discharge does not have successful data recovered access bearer.
The embodiment of the invention also provides a kind of data transmission channel migratory system, and this system can be used to the above-mentioned data transmission channel moving method of realizing that the embodiment of the invention provides.
Fig. 6 is the structured flowchart according to the data transmission channel migratory system of the embodiment of the invention, and is as shown in Figure 6, and this system comprises: target BS 62, be used for after UE is reconstructed into target BS, and send the signaling of request path migration to core net; Core net 64 is coupled to target BS 62, is used for after receiving signaling, and the data transmission channel of subscriber equipment is moved to the data transmission channel between core net and the target BS.
Wherein, new data transmission channel all can comprise descending general packet wireless service tunnel protocol tunnel and/or up general packet wireless service tunnel protocol tunnel.Preferably, new data transmission channel is the data transmission channel between core net 64 and the target BS 62.
In a preferred implementation of the present invention, target BS 62 is used for before request is rebuild in the wireless connections that receive the UE transmission, obtaining the contextual information of UE through X2 interface signaling or S1 interface signaling.
In another preferred implementation of the present invention, target BS 62 is used for before sending the signaling of request path migration to core net 64, being UE reconfiguration data radio bearer.
In another preferred implementation of the present invention; Core net 64 is used for after the data transmission channel of UE is moved to the data transmission channel between core net and the target BS; Return the response of request path migration to target BS 62, comprise the up list information of the RAB that new S1 Application Part that core net distributes for this UE identifies and move in this response.
Preferably, the signaling of request path migration is path migration request, reconstruction notice signaling or switching notice signaling.
Preferably, the signaling of request path migration comprises following information one of at least: Mobility Management Entity be the RAB of the UE S1 Application Part sign of distributing, needs migration sign and Target Cell Identifier that address information, UE rebuild, trigger the reason that move in the path.
In sum, through the present invention, after UE was reconstructed into target BS, target BS can in time recover the connection of this UE at the S1 interface, and the up-downgoing data of UE can rebuild continued maintenance transmission.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a data transmission channel moving method is characterized in that, comprising:
After subscriber equipment was reconstructed into target BS, said target BS sent the signaling of request path migration to core net;
Said core net is moved to the data transmission channel between said core net and the said target BS with the data transmission channel of said subscriber equipment after receiving said signaling.
2. method according to claim 1 is characterized in that, said data transmission channel comprises descending general packet wireless service tunnel protocol tunnel and/or up general packet wireless service tunnel protocol tunnel.
3. method according to claim 1 is characterized in that, before said target BS sent the signaling of request path migration to core net, said method also comprised:
Receive at said target BS before the wireless connections reconstruction request of said subscriber equipment transmission, said target BS obtains the contextual information of said subscriber equipment through X2 interface signaling or S1 interface signaling.
4. method according to claim 1 is characterized in that, before said target BS sent the signaling of request path migration to core net, said method also comprised:
Said target BS is said subscriber equipment reconfiguration data radio bearer.
5. method according to claim 1 is characterized in that, after the data transmission channel of the data transmission channel of said subscriber equipment being moved between said core net and the said target BS, said method also comprises:
Said core net is returned the response of request path migration to said target BS; Comprise said core net in the said response and be the up list information of RAB of new S1 Application Part sign and the migration of said user equipment allocation.
6. according to each described method in the claim 1 to 5, it is characterized in that the signaling of described request path migration is path migration request, reconstruction notice signaling or switching notice signaling.
7. according to each described method in the claim 1 to 5, it is characterized in that the signaling of described request path migration comprises following information one of at least:
Mobility Management Entity is the S1 Application Part sign of said user equipment allocation, the sign and the Target Cell Identifier that address information, said subscriber equipment are rebuild that need the RAB of migration, the reason that triggers the path migration.
8. a data transmission channel migratory system is characterized in that, comprising:
Target BS is used for after subscriber equipment is reconstructed into said target BS, sends the signaling of request path migration to core net;
Said core net is used for after receiving said signaling, and the data transmission channel of said subscriber equipment is moved to the data transmission channel between said core net and the said target BS.
9. system according to claim 8 is characterized in that, said target BS is used for before request is rebuild in the wireless connections that receive said subscriber equipment transmission, obtaining the contextual information of said subscriber equipment through X2 interface signaling or S1 interface signaling.
10. system according to claim 8 is characterized in that, said target BS is used for before sending the signaling of described request path migration to said core net, being said subscriber equipment reconfiguration data radio bearer.
11. system according to claim 8; It is characterized in that; Said core net is used for the data transmission channel of said subscriber equipment is moved to after the data transmission channel between said core net and the said target BS, returns the response of request path migration to said target BS.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102863939A CN102404809A (en) | 2010-09-07 | 2010-09-07 | Method and system for transferring data transmission channel |
| PCT/CN2011/077446 WO2012031507A1 (en) | 2010-09-07 | 2011-07-21 | Method and system for migration of data transmission channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102863939A CN102404809A (en) | 2010-09-07 | 2010-09-07 | Method and system for transferring data transmission channel |
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| WO2012031507A1 (en) | 2012-03-15 |
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