CN101998541A - Receding method and system of video phone (VP) service in process of switching 3G system to 2G system - Google Patents
Receding method and system of video phone (VP) service in process of switching 3G system to 2G system Download PDFInfo
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- CN101998541A CN101998541A CN200910056133XA CN200910056133A CN101998541A CN 101998541 A CN101998541 A CN 101998541A CN 200910056133X A CN200910056133X A CN 200910056133XA CN 200910056133 A CN200910056133 A CN 200910056133A CN 101998541 A CN101998541 A CN 101998541A
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Abstract
The invention relates to a receding method and system of a video phone (VP) service in the process of switching a 3G system to a 2G system, which is used for shortening the switching processes and improving the success ratio of the processes. The scheme is adopted by the invention the following steps: judging whether the process of switching the 3G system to the 2G system is needed or not, and if the process is needed, sending a transfer request message from a radio network controller to a mobile switching center; receiving the transfer request message from the mobile switching center; when the detection result shows that the current service of a terminal is the VP service, modifying the service type of the non-access layer of the terminal from the VP service into a voice service, and then, responding a transfer command message from the mobile switching center to the radio network controller; and responding to the transfer command message, sending a switching command from the radio network controller to the terminal, switching the instruction terminal to the cell of the target 2G system, and modifying the service type of the access layer from the VP service into the voice service.
Description
Technical field
The present invention relates to the switching of mobile communication system, especially relate to the 3G method and system that visual telephone service falls after rise in the 2G handoff procedure from 3G network to the 2G network.
Background technology
There is the time of 2G network and 3G network transition in the laying initial stage of 3G network, so needs the 2G network as a supplement, makes that the coverage of whole network is wider, and power system capacity is higher.
When 3G network and 2G network exist simultaneously, when UE (User Equipment, user terminal) moves the 2G overlay area 3G zone, need between the 2G/3G network, switch.In order to guarantee professional continuity, need to introduce the mechanism that 3G/2G switches.Yet the user exists current business 3G to support the unsupported situation of 2G in moving process probably.If force this moment 3G to switch 2G, then switching can failure.
A kind of method of solution is when CN (Core Network, core net) assigns RAB (Radio Access Bearer, RAB) professional, except assigning this professional information, also to have assigned the information of optional business.When needs are sent out the switching of 3G/2G, the switching of optional business support 3G/2G if current business is not supported, then earlier with professional reprovision to optional business, RNC (Radio Network Controller, radio network controller) send the professional request of resetting to CN, after CN receives request, the issuing service reconfiguration message, RNC is changed to the business that can carry out the 3G/2G switching with the current business reprovision after receiving message, carries out the switching of 3G/2G again.As current business is 2G network and unsupported VP (Video Phone, video telephone) business, then at first mutual by RNC and CN, revise current business, change the VP business AMR (the Adaptive Multi-Rate adaptive multi-rate) speech business of 2G network support into, and then 3G network is switched to the 2G network.This is called the professional falling of VP with the process that the VP business changes speech business into.
After the VP business was successfully set up, promptly business was carried out in the process, after the UE reporting measurement reports is given RNC; RNC judges need carry out switching (for example, switching to GSM) between system, and according to the prior art standard, RNC at first need fall back to speech business with the VP business in current access technology; And then carry out 3G to the switching flow between 2G.Fig. 1 illustrates a kind of 3G of prior art to the professional flow process that falls after rise of the VP in the 2G handoff procedure.With reference to shown in Figure 1, this flow process specifically describes as follows:
Carry out in the process in the VP business, at step S1, UE A can send Measurement Report (measurement report) and give RNC A; Receive the Measurement Report (measurement report) of UE as RNC A after, judgement need be carried out switching between system, in step S2, RNC A sends RANAP Modify Request, and (RANAP revises request, RANAP:Radio Access Network Application Part, Radio Access Network Application Part) message is given MSC (Mobile Switching Center, mobile switching centre) A;
MSC A receives the RANAP Modify Request message of RNC A, after judgement can be fallen back to speech business with the VP business, in step S3-S6, and terminal (UE A and UE B) finishes the Modify flow process, is speech business with the type of service of Non-Access Stratum from the VP business modification;
Wherein, after finishing the Modify flow process with UE A, in step S7, MSC A sends RABAssignment Modify (RAB distributes modification) message again and gives RNC A, and notice RNC A reshuffles the service bearer resource of UE A; After RNC A receives RAB Assignment Modify message,, send RB SETUP message to UE A, so that the VP service bearer of UE A is reshuffled the service bearer that becomes voice in step S8; After UE A finishes service bearer and reshuffles, send RB SETUP COMPLETE message to RNC A in step S9, the VP business of finishing under the current access technology at Access Layer falls back to speech business process (S10);
UE B is identical with UE A in the professional falling of the VP flow process of (being under the 3G access technology) under the current access technology.
Receive the RB SETUP COMPLETE message of UE A as RNC A after, initiate to require migration message (Iu Relocation Required) message to give MSC A by the Iu interface, require to carry out switching between system in step S11; MSC A receives Iu Relocation Required message, finishes after the pre-allocation of resources of goal systems (GSM), and message in response to send Iu Relocation Command (Iu switching command) in step S12 to RNC A;
After RNC A receives Iu Relocation Command message, send switching command (RRC-HO-Command) in step S13 and give UE A; When UE A finish between system switch after, send RRC-HO-Complete message to BSS (Base Station Sub-System, base station sub-system) in step S14 at Target cell, finish handoff procedure between system.
From above-mentioned flow process as can be seen, under the prior art standard, when terminal is carried out in the process in the VP business, when need carry out switching between system, if goal systems is not supported the VP business, so at first need finish the professional falling process to speech business of VP under current access technology, this process comprises falling (Modify) process of Non-Access Stratum and the carrying reconfiguration course (RB SETUP) of Access Layer; After current access technology is finished the professional falling of VP, carry out the handoff procedure between system again.When terminal need carry out switching between system, probably be to be in the edge that the 3G sub-district covers, and finish the professional process flow relative complex that falls after rise of above-mentioned VP, and consuming time long, so just make that the probability of handoff failure increases greatly between professional falling of VP and system.
Summary of the invention
Technical problem to be solved by this invention provides the professional method and system that falls after rise of a kind of 3G VP in the 2G handoff procedure, and the professional flow process that falls after rise of VP is optimized.
An aspect of of the present present invention provides a kind of 3G the method that visual telephone service falls after rise in the 2G handoff procedure, and it may further comprise the steps:
Judge whether to carry out of the switching of 3G system, if desired, then send and require to move message to mobile switching centre from radio network controller to the 2G system;
Receive described requirement migration message in mobile switching centre, and when detecting the current business of terminal and be visual telephone service, the type of service of terminal Non-Access Stratum is revised as speech business from visual telephone service;
Respond the migration command messages from mobile switching centre to radio network controller; And
Respond described migration command messages, send switching command to terminal from radio network controller, command terminal switches to the sub-district of target 2G system and the type of service of Access Layer is revised as speech business from visual telephone service.
Another aspect of the present invention provides a kind of 3G the system that visual telephone service falls after rise in the 2G handoff procedure, comprises radio network controller, mobile switching centre and at least one terminal.Radio network controller judges whether to carry out the switching of 3G system to the 2G system, if desired, then sends and requires to move message to mobile switching centre.Mobile switching centre receives and requires migration message, and when judging that the current business of terminal is visual telephone service, the type of service of terminal Non-Access Stratum is revised as speech business from visual telephone service, responds the migration command messages to described radio network controller then.The radio network controller response is moved command messages and is sent switching command to terminal.Terminal switches to the sub-district of target 2G system according to switching command, and the type of service of Access Layer is revised as speech business from visual telephone service.
In one embodiment of this invention, the type of service of terminal Non-Access Stratum being revised as speech business from visual telephone service can finish by the modification process between above-mentioned mobile switching centre and the above-mentioned terminal.
In one embodiment of this invention, before radio network controller is responded the migration command messages, also can comprise, between the target 2G of mobile switching centre and switching system, finish pre-allocation of resources in mobile switching centre.The process of wherein above-mentioned pre-allocation of resources can be carried out simultaneously with above-mentioned modification process.
In one embodiment of this invention, above-mentioned 3G system can be TD-SCDMA system or WCDMA system.
Therefore, the professional method that falls after rise of 3G of the present invention VP in the 2G handoff procedure is by reducing the Signalling exchange between RNC and the MSC and removing service bearer reconfiguration course under current access technology, shorten this switching flow greatly, thereby improve the success rate of this flow process greatly.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates a kind of 3G of prior art to the professional flow process that falls after rise of the VP in the 2G handoff procedure.
Fig. 2 illustrates the 3G of one embodiment of the invention to the professional flow process that falls after rise of the VP in the 2G handoff procedure.
Embodiment
Embodiments of the invention are to carry out in the process in the VP business in view of the prior art standard, when switching between triggering system, and the flow process complexity, consuming time longer, the problem of failure has provided the flow process of optimizing easily, can shorten this switching flow, thereby improve the success rate of this flow process greatly.
Fig. 2 illustrates the 3G of one embodiment of the invention to the professional flow process that falls after rise of the VP in the 2G handoff procedure.With reference to shown in Figure 2, this flow process is to carry out in a wireless telecommunication system, and this wireless telecommunication system comprises the A such as UE, a plurality of user terminals (User Equipment of UEB, UE), radio network controller (Radio Network Controller, RNC) A is such as MSC A, (the Mobile Switching Center of the mobile switching centre of MSC B, MSC), and base station sub-system (Base Station Sub-System, BSS).
In following flow process, with UE A, RNC A, the business falling process between MSC A and the BSS is that example is described below:
In step S101, terminal UE A sends measurement report (Measurement Report) and gives radio network controller (RNC) A;
In step S102, radio network controller (RNC) A judges whether to carry out the switching of 3G to 2G according to measurement report.Carry out above-mentioned switching if desired, then with prior art need carry out earlier RANAPModify Request signaling process different be, radio network controller (RNC) A will directly send by the Iu interface and require migration message (Iu Relocation Required) to give moving exchanging center MSC A, require to carry out switching between system; Wherein, the Iu interface is an interface of being responsible for the Signalling exchange between Access Network and the core network.
After moving exchanging center MSC A receives and requires migration message (Iu Relocation Required), as to detect the current business of terminal UE A be VP business (Video Phone, visual telephone service), and Target cell is not supported the VP business, then needs to carry out professional falling the after rise of VP and just can carry out 3G and switch between the system of 2G.Correspondingly, in step S103-S104, the flow process of making amendment between MSC A and the terminal UE A, in this flow process, moving exchanging center MSC A sends and revises message (Modify) to terminal, terminal is speech business with the type of service of Non-Access Stratum from the VP business modification, and responds to revise and finish message (Modify Complete) to moving exchanging center MSC A.
In step S105, in response to requiring to move message (Iu Relocation Required), moving exchanging center MSC A can be automatically and is comprised core network flow process such as pre-allocation of resources between the base station sub-system BSS as target system switched (2G).This process is a flow process known in the art, no longer launches to describe at this.Carry out after step S103 and S104 although step 105 is shown, yet in fact step 105 can carry out simultaneously with modification process.
As moving exchanging center MSC A with terminal UE A finishes modification process and after goal systems (2G) is finished the core network flow process, to need independent radio bearer (RB SETUP) process of reshuffling to finish the professional falling process to speech business of VP of Access Layer different with prior art, in the present embodiment, particularly, in step S106, moving exchanging center MSC A responds migration command messages (Iu Relocation Command) to carry out system's switching flow by the Iu interface to radio network controller (RNC) A.This system's switching flow further comprises: step S107, radio network controller (RNC) A response migration command messages (Iu Relocation Command) sends switching command (RRC-HO-Command) and gives terminal UE A.Terminal UE A responds switching command, and carry out mutual between the base station sub-system BSS of target system switched (2G), after treating that successful switch arrives the sub-district of goal systems (2G),, send handoff completion message (RRC-HO-Complete) at Target cell and give base station sub-system BSS in step S108.Wherein, in system's switching flow or before, finish falling process 109 at Access Layer from the VP business to speech business.
Modification process that another terminal UE B and corresponding moving exchanging center MSC B are carried out and the flow process of system's switching flow and terminal UE A are similar, no longer launch to describe at this.
In an embodiment of the present invention, 3G network includes but not limited to TD-SCDMA network and WCDMA network, and the 2G network includes but not limited to the GSM network.
In sum, the professional flow process that falls after rise of the VP of embodiments of the invention, by reducing the Signalling exchange between radio network controller (RNC) and the moving exchanging center MSC, as RANAP Modify Request and RAB Assignment Modify process, and remove service bearer reconfiguration course under current access technology, be RB SETUP process, shorten switching flow greatly, thereby improve the success rate of flow process greatly.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (11)
1. the method that falls after rise of 3G visual telephone service in the 2G handoff procedure may further comprise the steps:
Judge whether to carry out of the switching of 3G system, if desired, then send and require to move message to mobile switching centre from radio network controller to the 2G system;
Receive described requirement migration message in mobile switching centre, and when detecting the current business of terminal and be visual telephone service, the type of service of terminal Non-Access Stratum is revised as speech business from visual telephone service;
Respond the migration command messages from mobile switching centre to radio network controller; And
Respond described migration command messages, send switching command to terminal from radio network controller, command terminal switches to the sub-district of target 2G system and the type of service of Access Layer is revised as speech business from visual telephone service.
2. the 3G as claimed in claim 1 method that visual telephone service falls after rise in the 2G handoff procedure, it is characterized in that described type of service with the terminal Non-Access Stratum is to finish by the modification process between described mobile switching centre and the described terminal from the step that visual telephone service is revised as speech business.
3. the 3G as claimed in claim 1 method that visual telephone service falls after rise in the 2G handoff procedure, it is characterized in that, the described step of responding the migration command messages to radio network controller from mobile switching centre also comprises before, finishes pre-allocation of resources between the target 2G of mobile switching centre and switching system.
4. the 3G as claimed in claim 2 method that visual telephone service falls after rise in the 2G handoff procedure, it is characterized in that, the described step of responding the migration command messages to radio network controller from mobile switching centre also comprises before, finish pre-allocation of resources between the target 2G of mobile switching centre and switching system, the process of wherein said pre-allocation of resources is to carry out simultaneously with described modification process.
5. the 3G as claimed in claim 1 method that visual telephone service falls after rise in the 2G handoff procedure is characterized in that, described 3G system comprises the TD-SCDMA system.
6. the 3G as claimed in claim 1 method that visual telephone service falls after rise in the 2G handoff procedure is characterized in that, described 3G system comprises the WCDMA system.
7. the system that falls after rise of 3G visual telephone service in the 2G handoff procedure comprises radio network controller, mobile switching centre and at least one terminal, wherein:
Described radio network controller judges whether to carry out the switching of 3G system to the 2G system, if desired, then sends and requires to move message to described mobile switching centre;
Described mobile switching centre receives described requirement migration message, and when judging that the current business of described terminal is visual telephone service, the type of service of described terminal Non-Access Stratum is revised as speech business from visual telephone service, respond the migration command messages to described radio network controller then, wherein said radio network controller responds described migration command messages and sends switching command to described terminal; And
Described terminal switches to the sub-district of target 2G system according to described switching command, and the type of service of Access Layer is revised as speech business from visual telephone service.
8. the 3G as claimed in claim 7 system that visual telephone service falls after rise in the 2G handoff procedure, it is characterized in that the flow process of making amendment between described mobile switching centre and the described terminal is to realize that the type of service of described terminal Non-Access Stratum is revised as speech business from visual telephone service.
9. the 3G as claimed in claim 7 system that visual telephone service falls after rise in the 2G handoff procedure, it is characterized in that, described mobile switching centre before radio network controller is responded the migration command messages, also and the target 2G system switched between finish pre-allocation of resources.
10. the 3G as claimed in claim 7 system that visual telephone service falls after rise in the 2G handoff procedure is characterized in that, described 3G system comprises the TD-SCDMA system.
11. the 3G as claimed in claim 7 system that visual telephone service falls after rise in the 2G handoff procedure is characterized in that, described 3G system comprises the WCDMA system.
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| CN 200910056133 CN101998541B (en) | 2009-08-10 | 2009-08-10 | Receding method and system of video phone (VP) service in process of switching 3G system to 2G system |
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| CN 200910056133 CN101998541B (en) | 2009-08-10 | 2009-08-10 | Receding method and system of video phone (VP) service in process of switching 3G system to 2G system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103916622A (en) * | 2013-01-06 | 2014-07-09 | 联想(北京)有限公司 | Talking mode switching method and device |
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| WO2009082301A1 (en) * | 2007-12-20 | 2009-07-02 | Telefonaktiebolaget L M Ericsson (Publ) | A method and an apparatus for handling multimedia calls |
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Patent Citations (3)
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| CN101094497A (en) * | 2006-01-06 | 2007-12-26 | 华为技术有限公司 | Method for switching mobile users between different access systems |
| CN101137197A (en) * | 2006-08-29 | 2008-03-05 | 华为技术有限公司 | Inter-system switch and multimedia fallback parallel processing method |
| WO2009082301A1 (en) * | 2007-12-20 | 2009-07-02 | Telefonaktiebolaget L M Ericsson (Publ) | A method and an apparatus for handling multimedia calls |
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