CN100536598C - Service wireless network subsystem repositioning method - Google Patents
Service wireless network subsystem repositioning method Download PDFInfo
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- CN100536598C CN100536598C CNB2006100081150A CN200610008115A CN100536598C CN 100536598 C CN100536598 C CN 100536598C CN B2006100081150 A CNB2006100081150 A CN B2006100081150A CN 200610008115 A CN200610008115 A CN 200610008115A CN 100536598 C CN100536598 C CN 100536598C
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Abstract
The method includes steps: in preparation phase of reorientation (RO), after accomplishing assigning RO resources, destination radio network controller (DRNC) returns back reply message of RO request to core network (CN); after receiving the message, CN sends message of RO command to source radio network controller (SRNC); after receiving the message of command, SRNC sends RO submission message to DRNC, and sends UTRAN message of mobile information to UE; after receiving the message, UE returns back confirmation message for UTRAN to DRNC; after receiving the confirmation message, DRNC starts up role change to SRNC, and then keeps up working on operation at ending phase. Being simple and easy to implement, the invention can raise PS real time service switching performance effectively and shorten data interrupt time delay of SRNS RO when SRNS carries out RO, no matter whether data are encrypted or not, and no matter what mode is adopted by RLC protocol.
Description
Technical field
The present invention relates to the method for SRNS Serving Radio Network Subsystem reorientation in the WCDMA system.
Background technology
Insert (Wideband Code Division Multiple Access in Wideband Code Division Multiple Access (WCDMA), abbreviation WCDMA) in the system, as user terminal (User Equipment, be called for short UE) from source radio network controller (Source Radio Network Controller, be called for short SRNC) when the sub-district moves to floating radio network controller (being called for short DRNC) sub-district, can pass through SRNS Serving Radio Network Subsystem (ServingRadio Network Subsystem, being called for short SRNS) repositioning process carries out the transfer of user's control, thus ambulant support between RNC is striden to UE by realization WCDMA system.
The third generation mobile partner plans (3rd Generation Partnership Project, abbreviation 3GPP) the implementation method to the SRNS reorientation is described, flow process as shown in Figure 1, wherein after DRNC receives that (Relocation Commit) message is submitted in reorientation that SRNC sends to, DRNC begins to carry out diversification in role, no longer pass through the Iur mouth from the SRNC receiving subscriber data, and send relocation detect-message to CN; Send UTRAN (UMTS Terrestrial radio access network) mobility information (UTRAN MOBILITY INFORMATION) message from RB1 (radio bearer 1) to UE then, UE returns UTRAN mobility information affirmation (UTRAN MOBILITYINFORMATION CONFIRM) message to DRNC by RB2 (radio bearer 2), DRNC finishes (Relocation Complete) message informing core net (Core Network by reorientation again, be called for short CN) the user face data flow direction is switched to DRNC from SRNC, and finish SRNS reorientation flow process.
Because DRNC has shifted the role when receiving the repositioning submission information that SRNC sends, interrupted from the reception of Iur mouth data, after this flow to DRNC to CN switching user face data before, the business data transmission of UE is always for interrupt status.And UTRAN mobility information message is by no response (Unacknowledged Mode, be called for short UM) the pattern transmission, when eating dishes without rice or wine the poor quality, may cause losing of this message, though the agreement regulation can repeatedly guarantee the correct probability of acceptance of UE to this message by retransmitting, and retransmits the time-delay that has strengthened service disconnection, especially for real time business, this time delay may exceed the demand of real time business Qos, the performance of handoffs of real time business when influencing the SRNS reorientation.
For addressing this problem, for PS (Packet Switching, packet switching) real time business, 3GPP provide two kinds of solutions in TR25.936---and SRNC duplicates, anti-pass mode and core net bi-Casting (core net is simultaneously to SRNC and DRNC transceive data) mode; In " A New Approach for Serving RadioNetwork Controller Relocation in UMTS All-IP Network " literary composition of the IEEE INFOCOM magazine of publishing in these external 2004, propose " SRNS reorientation fast " scheme that core net bi-Casting and DRNC metadata cache combine, this method is the improvement of being suggested plans among the 3GPP 25.936 in fact.No matter adopt which kind of method, their core concept all is when the SRNS reorientation takes place, data by SRNC are duplicated, the bi-Casting of anti-pass or core net, make DRNC can before the SRNS reorientation is finished, just can in time receive the data flow of CN, and, DRNC one promptly recovers to reduce the service disconnection time delay with the transfer of data between the UE when finishing diversification in role.
But, do not reply the transfer of data of promptly recovering between DRNC and the UE before the UTRAN mobility information acknowledge message as yet at UE and have defective according to said method.If radio link control (Radio Link Control is called for short RLC) is for replying (Acknowledged Mode is called for short AM) pattern, because the corresponding RLC entity of DRNC side RLC entity sequence number and UE side sequence number is inconsistent, AM pattern rlc protocol reseting procedure can take place then.If RLC is the UM pattern, then under the encryption situation, same because the DRNC side is inconsistent with UE side RLC entity sequence number, can cause the upset of UE side HFN sequence number, make follow-up data flow the deciphering failure.Therefore this several method switches its limitation is all arranged solving real time business, can't solve that AM pattern RLC resets and the encryption situation under these two problems of UM pattern RLC data decryption.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method for relocating service wireless network subsystem, no matter rlc protocol adopts any pattern, and the performance of handoffs of PS real time business in the time of all can effectively improving the SRNS reorientation.
In order to solve the problems of the technologies described above, the invention provides a kind of method for relocating service wireless network subsystem, may further comprise the steps:
(a) in the reorientation preparatory stage, after purpose radio network controller DRNC finishes the reorientation resource allocation, reply relocation request acknowledge message to core net CN, after CN receives, send the reorientation command messages to source radio network controller SRNC;
(b) after this SRNC receives this command messages, send repositioning submission information, and send UMTS Terrestrial radio access network (UTRAN) mobility information message, after UE receives this message, reply UTRAN mobility information acknowledge message to DRNC to UE to DRNC;
(c) after DRNC receives this acknowledge message, begin to proceed to the diversification in role of SRNC, continue to finish the operation of reorientation ending phase then.
Further, said method also can have following characteristics: in the described step (a), when DRNC replys relocation request acknowledge message to CN, carry the content of UTRAN mobility information message; CN is the reorientation command messages by sending to SRNC again, and the content of this message is forwarded to SRNC.
Further, said method also can have following characteristics: in the described step (a), be the content of described mobility information message to be put into DRNC to SRNC transparent vessel cell bring CN, by CN the content of this transparent vessel filled out again and in the reorientation command messages, be transmitted to this SRNC.
Further, said method also can have following characteristics: in the described step (a), described DRNC puts into DRNC to SRNC transparent vessel cell after adopting downlink dedicated control channel message mode with described mobility information message coding.
Further, said method also can have following characteristics: in the described step (b), SRNC decodes the content of the UTRAN mobility information message in the transparent vessel earlier after receiving this command messages, sends UTRAN mobility information message to UE again.
Further, said method also can have following characteristics: in the described step (b), SRNC sends UTRAN mobility information message by first radio bearer to UE, after UE receives this UTRAN mobility information message, stop second radio bearer Radio Link control RLC in addition, and reply UTRAN mobility information acknowledge message from second radio bearer to DRNC, and when DRNC receives repositioning submission information after, the data of second radio bearer are monitored and received.
Further, said method also can have following characteristics: in the described step (c), in the reorientation ending phase, described DRNC replys reorientation to CN and finishes message and relocation detect-message, after CN receives that message is finished in reorientation, migration Iu mouth user face data flows to this DRNC, and the related resource of deletion SRNC is finished the SRNS repositioning process.
Further, said method also can have following characteristics: in the described step (a), DRNC carries Radio Network Temporary Identifier and the integrity information of newly assigned UTRAN in the relocation request acknowledge message that CN replys; Be carried to SRNC by CN to the reorientation command messages that SRNC sends again, this SRNC generates described mobility information message according to these information and is handed down to UE.
Further, said method also can have following characteristics: in the described step (c), when DRNC proceeds to the diversification in role of SRNC, data and signaling bear between foundation of reorientation preparatory stage and described UE are come into force, beginning data transmit-receive, and deletion Iur mouth link.
Adopt the method for the invention, simple, no matter data encryption whether, no matter what pattern rlc protocol adopts, the performance that the PS real time business switches in the time of can improving the SRNS reorientation effectively shortens SRNS reorientation data interruption time delay.Further, can also have the following advantages:
1) by utilizing original protocol message flow process and message content, do not introduce extra agreement cell, little to agreement change influence.
2) do not need to set up the carrying of anti-pass data, do not need to carry out duplicating anti-pass and carrying out the buffer memory of data of data, reduced implementation complexity, reduced the expense of resource.
3) can not have the inconsistent problem of sequence number between the RLC of SRNC and the UE transmitting-receiving entity in the repositioning process, the present invention can well avoid DRNC to issue deciphering failure that data cause and the problem of RLCAM pattern RESET in advance.
4) do not relate to the change of core net, reduced the risk that cooperation brings between network element.Avoided duplicating, anti-pass mode problem, the problem includes: the out-of-sequence problem of N-PDU sequence number.
Therefore the present invention has higher practical application meaning.
Description of drawings
Fig. 1 is a 3GPP SRNS reorientation schematic flow sheet;
Fig. 2 is the SRNS reorientation schematic flow sheet of the embodiment of the invention;
Fig. 3 is the SRNS reorientation data flow schematic diagram of TR25.936 copy mode, and CN among the figure, SRNC, the solid line between DRNC represent that downlink data flows to, and dotted line represents that upstream data flows to;
Fig. 4 is the SRNS reorientation data flow schematic diagram of the embodiment of the invention, and CN among the figure, SRNC, the solid line between DRNC represent that downlink data flows to, and dotted line represents that upstream data flows to.
Embodiment
Core principles of the present invention is in the SRNS repositioning process, replace DRNC by SRNC and issue UTRAN mobility information message, and when DRNC receives repositioning submission information, diversification in role is postponed opportunity, keep UE by the transmission of former Iur mouth with the SRNC data link, DRNC only receives the data of signaling bear RB2 this moment.After DRNC received the UTRAN mobility information acknowledge message that UE replying on the RB2, carrying out diversification in role completely again was SRNC, the relation of continuing of data is switched to the Iu mouth from the Iur mouth, and finish follow-up repositioning process.
Because the DRNC diversification in role is postponed, therefore before UE replys UTRAN mobility information acknowledge message, UE can also normally keep the transfer of data with SRNC, after UE replys, DRNC then can very fast transmission reorientation finish message to CN again, make the changeable user's face of CN to DRNC, recover the transfer of data between UE and the DRNC.Therefore, adopt this method shorter, can guarantee the Qos characteristic requirement of real time business the break period of business.Simultaneously owing to can not have the inconsistent problem of sequence number between the RLC of SRNC and the UE transmitting-receiving entity, so can well avoid DRNC to issue in advance that UM pattern RLC deciphering that data cause is failed and the problem of RLC AM pattern RESET.
As from the foregoing, realize method of the present invention, compare two changes with the SRNS reorientation way of former 3GPP agreement regulation.One need take UTRAN mobility information information to SRNC from DRNC, replaces DRNC to issue this message by SRNC; Its two, DRNC diversification in role opportunity postpones, and changes when originally receiving repositioning submission information to postpone till DRNC and change after RB2 receives UTRAN mobility information acknowledge message again.
The SRNS reorientation can be divided into the reorientation preparation by the difference of implementation, and reorientation execution and reorientation finish three phases, 1～4,5～8,9～11 among this three phases difference corresponding diagram 1 and Fig. 2.
Fig. 2 shows the SRNS reorientation flow process of the embodiment of the invention, adopt method of the present invention, in the reorientation step 3 of preparatory stage, when DRNC finishes the reorientation resource allocation, when CN answer re-positioning request is replied (Relocation Request Acknowledge) message, comprise TargetRNC to Source RNC Transparent Container (purpose RNC is to source RNC transparent vessel) cell in this message, DRNC adopts DL DCCH message (downlink dedicated control channel message) mode to encode UTRAN mobility information message, Rrc container (Rrc Container) lining of putting into wherein brings CN, as CN during to reorientation command messages that SRNC sends, intact this transparent vessel content is filled out in the reorientation command messages sends to SRNC;
After SRNC receives the reorientation command messages, decode the content in the Rrc container, promptly can shown in the step 6 of Fig. 2, this message be handed down to UE by RB1.Because there has been the cell of Container in protocol message and DL DCCH message is provided coded system at present, therefore to realize this way, do not need newly-increased protocol information contents and cell.
In the reorientation execution phase, SRNC sends repositioning submission information to DRNC, and to UE transmission UTRAN mobility information message, SRNC continues to keep transfer of data by the Iur mouth with UE, after UE receives this UTRAN mobility information message, stop RB2 RLC (the business datum carrying between UE and the SRNC stops) in addition, and reply UTRAN mobility information acknowledge message to DRNC from RB2, therefore DRNC is after finishing the reorientation resource allocation, only need to monitor the data flow on the RB2, after receiving UTRAN mobility acknowledge message, DRNC promptly begins to carry out the diversification in role of SRNC, data and the signaling bear set up in the DRNC reorientation preparatory stage are come into force, beginning data transmit-receive, and deletion Iur mouth link are finished message to CN answer reorientation detection and reorientation.
In the reorientation ending phase, after CN received that message is finished in reorientation, migration Iu mouth user face data flowed to DRNC, and the related resource of deletion SRNC is finished the SRNS repositioning process.
According to the inventive method, after SRNS reorientation flow process changes, compare with 3GPP TR25.936 copy mode, also bring the difference of reorientation execution phase data flow under two kinds of diverse ways.
Fig. 3 is the data flow that switches in the reorientation three phases according to the PS real time business of 3GPP TR25.936 copy mode.As a comparison, Fig. 4 provides the reorientation data flow of the embodiment of the invention.From the contrast of two figure and as can be seen in conjunction with Fig. 1, Fig. 2, Fig. 3 is that DRNC role promptly changes at the beginning of the reorientation execution phase, Iur mouth transfer of data is interrupted, for guaranteeing professional real-time, DRNC keeps transfer of data from the packet of Iu mouth anti-pass with UE by SRNC, but this method as previously mentioned because DRNC and UE side RLC sequence number are inconsistent, UM pattern RLC encrypt and the situation of AM pattern RLC under have defective, in these cases, do not have the effect that improves real-time.
And adopt method of the present invention, can see according to Fig. 4, in the reorientation execution phase, DRNC receives only the data of RB2, before confiscating the UTRAN mobility information acknowledge message that UE replys from RB2, DRNC does not carry out diversification in role, SRNC continues to keep transfer of data by the Iur mouth with UE, and SRNC can keep unanimity with the sequence number of RLC between the UE, two defectives that can not exist former approach to carry, therefore adopt method of the present invention, in improving the SRNS repositioning process, in the PS real time business performance of handoffs, can also solve under UM pattern RLC encryption or AM pattern RLC situation because the PS real time business of the inconsiderate introducing of flow process switches defective.
In another embodiment of the present invention, also can be in the reorientation step 3 of preparatory stage, when DRNC finishes the reorientation resource allocation, when CN replys relocation request acknowledge message, with the Radio Network Temporary Identifier (URNTI) of newly assigned relevant UTRAN, information bands such as integrality are given CN, as CN during to reorientation command messages that SRNC sends, with above-mentioned relevant URNTI, information bands such as integrality are given SRNC; After SRNC receives the reorientation command messages, according to above-mentioned relevant URNTI, information organization UTRAN mobility information message such as integrality, and this message is handed down to UE by RB1.
Claims (8)
1, a kind of method for relocating service wireless network subsystem may further comprise the steps:
(a) in the reorientation preparatory stage, after purpose radio network controller DRNC finishes the reorientation resource allocation, reply relocation request acknowledge message to core net CN, this relocation request acknowledge message is carried the content of UTRAN mobility information message, after CN receives, send the reorientation command messages to source radio network controller SRNC, and the content of described UTRAN mobility information message is forwarded to SRNC;
(b) after this SRNC receives this command messages, send repositioning submission information, and send UMTS Terrestrial radio access network UTRAN mobility information message, after UE receives this message, reply UTRAN mobility information acknowledge message to DRNC to UE to DRNC;
(c) after DRNC receives this acknowledge message, begin to proceed to the diversification in role of SRNC, continue to finish the operation of reorientation ending phase then.
2, the method for claim 1, it is characterized in that, in the described step (a), the mode that this relocation request acknowledge message is carried the content of UTRAN mobility information message is the content of described mobility information message to be put into DRNC to SRNC transparent vessel cell bring CN, and CN is the content of this transparent vessel to be filled out be transmitted to this SRNC in the reorientation command messages with the mode that the content of described UTRAN mobility information message is forwarded to SRNC.
3, method as claimed in claim 2 is characterized in that, in the described step (a), described DRNC puts into DRNC to SRNC transparent vessel cell after adopting downlink dedicated control channel message mode with described mobility information message coding.
4, method as claimed in claim 3 is characterized in that, in the described step (b), SRNC decodes the content of the described UTRAN mobility information message in the transparent vessel earlier after receiving this command messages, send described UTRAN mobility information message to UE again.
5, the method for claim 1, it is characterized in that, in the described step (b), SRNC sends UTRAN mobility information message by first radio bearer to UE, after UE receives this UTRAN mobility information message, stop second radio bearer Radio Link control RLC in addition, and reply UTRAN mobility information acknowledge message to DRNC from second radio bearer, and after DRNC receives repositioning submission information, only the data of second radio bearer are monitored and received.
6, the method for claim 1, it is characterized in that, in the described step (c), in the reorientation ending phase, described DRNC replys reorientation to CN and finishes message and relocation detect-message, and after CN received that message is finished in reorientation, migration Iu mouth user face data flowed to this DRNC, the related resource of deletion SRNC is finished the SRNS repositioning process.
7, the method for claim 1 is characterized in that, in the described step (a), DRNC carries Radio Network Temporary Identifier and the integrity information of newly assigned UTRAN in the relocation request acknowledge message that CN replys; Be carried to SRNC by CN to the reorientation command messages that SRNC sends again, this SRNC generates mobility information message according to these information and is handed down to UE.
8, the method for claim 1 is characterized in that, in the described step (c), when DRNC proceeds to the diversification in role of SRNC, data and signaling bear between foundation of reorientation preparatory stage and described UE is come into force, beginning data transmit-receive, and deletion Iur mouth link.
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| CNB2006100081150A CN100536598C (en) | 2006-02-20 | 2006-02-20 | Service wireless network subsystem repositioning method |
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| CNB2006100081150A CN100536598C (en) | 2006-02-20 | 2006-02-20 | Service wireless network subsystem repositioning method |
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| CN100536598C true CN100536598C (en) | 2009-09-02 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2374294B1 (en) * | 2008-12-18 | 2016-03-09 | Telefonaktiebolaget LM Ericsson (publ) | Method and arrangement for improved positioning |
| CN102378294B (en) | 2010-08-12 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of method switched between PS operation system in bimodulus RNC and device |
| CN107579961B (en) * | 2017-08-23 | 2020-05-08 | 电子科技大学 | Information secret transmission method of access network |
| CN114466418B (en) * | 2022-02-09 | 2024-03-08 | 成都中科微信息技术研究院有限公司 | Method for improving XN switching execution efficiency of NR system, switching method and NR system |
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- 2006-02-20 CN CNB2006100081150A patent/CN100536598C/en active Active
Non-Patent Citations (2)
| Title |
|---|
| Technical Specification Group(TSG) RAN3, Handovers forreal-time services from PS domain (Release 4). 3GPP.3GPP TR 25.936 v4.0.1. 2001 |
| Technical Specification Group(TSG) RAN3, Handovers forreal-time services from PS domain (Release 4). 3GPP.3GPP TR 25.936 v4.0.1. 2001 * |
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