CN101472302B

CN101472302B - Method and device for switching business

Info

Publication number: CN101472302B
Application number: CN2007103063816A
Authority: CN
Inventors: 余勇军; 邓永锋; 王济勇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-12-28
Filing date: 2007-12-28
Publication date: 2011-12-07
Anticipated expiration: 2027-12-28
Also published as: CN101472302A

Abstract

The embodiment of the invention discloses a service handoff method which comprises the following steps: after a domain handoff process from an IMS domain to a CS domain is completed, and the objective network fails to be connected with user equipment, the user equipment is turned back to a source network, sends a session request message to the IMS, and is transformed from the CS domain to the IMSdomain. The embodiment of the invention discloses a device for service handoff, and the device comprises a sending module, a receiving module and a handoff module. By adopting the method and the device, the domain handoff process of the user equipment switched from the IMS domain to the CS domain can be finished, after the failure of being connected to the objective network, the user equipment can be returned to the source network again, so that the current service of the user equipment can not be interrupted, and the service quality is improved.

Description

A kind of professional method and device that switches

Technical field

The present invention relates to mobile communication technology, refer in particular to a kind of professional method and device that switches.

Background technology

In existing mobile communication technology,, the speech business of mobile communication can be divided into following two classes at different network carrying mechanism:

1) session service of circuit (CS) territory carrying is as voice call;

2) session service of data (PS) territory carrying is also referred to as Internet protocol (IP) voice (VoIP) professional (for example the voice call of IP carrying etc.), provides service quality (QoS) to guarantee by IP multimedia system (IMS).

In the second generation (the 2G)/third generation (3G) network, speech business generally all is to be carried on the CS territory; And the packet switching system that System Architecture Evolution (SAE)/Long Term Evolution (LTE) network carries as a kind of PS territory, speech business can only be transmitted in its packet domain carrying, and is come speech business is controlled by the network based on the IP carrying by IMS.

Along with System Architecture Evolution (SAE)/Long Term Evolution (LTE) development of internet technology, in present communication network, the phenomenon that the SAE/LTE network and the second generation (the 2G)/third generation (3G) network occurred and deposited.Because the SAE/LTE network belongs to initial stage, so there is the limitation of the network coverage in the SAE/LTE network.For example, when the user sets up the VoIP business in the SAE/LTE network after, in moving process, might need the VoIP business is switched to the 2G/3G network.And owing to only support the CS business at the 2G network, so when the VoIP business in the SAE/LTE network switched to the 2G network, the service disconnection phenomenon can appear, thus influence the continuity of speech business.

In order to address the above problem, guarantee the service quality of speech business, general at present single Radio Link voice continuity (SR VCC) technology that adopts.In SR VCC technology, imitate the function of two Radio Links (Dual Radio) by using single Radio Link (Single Radio), can realize the seamless switching between PS territory and CS territory, thereby solve the continuity problem that is carried on the IMS speech business on the SAE/LTE network and is carried on speech business between the CS territory.

At present, speech business switches to the 2G/3G network from the SAE/LTE network technical scheme has been proposed in the prior art, in this scheme, introduced a new network node CS-Proxy, be used for solving from SAE/LTE PS territory to the switching in universal mobile telecommunications system (UMTS)/global mobile communication or enhanced data rates global mobile communication evolution technology wireless access network (GERAN) CS territory.In this network configuration, the mobile management entity (MME) of the side of CS-Proxy and SAE/LTE one side has interface, and the core net in opposite side and UMTS/GERAN CS territory has interface.Base station (eNB when the evolution of SAE/LTE side, Envolved NodeB) after CS-Proxy sends handoff request, the handoff request message that CS-Proxy can be the CS territory with this handoff request message transformation, its subsequent process is mobile switching centre (MSC) switching flow of standard just.Therefore, for the user, CS-Proxy has been equivalent to realize the function of MSC in the SAE/LTE network, have the anchor point effect in switching, can be to the handoff request of UMTS/GERAN CS territory forwarding from the SAE/LTE network.Therefore, in the VCC handoff procedure in the prior art, at first carry out the territory transfer process from IMS to CS, and then carry out the change of wireless access technology (RAT).

In the business switch method in the prior art, after UE-A finished switching set-up procedure and territory flow path switch, UE-A changed its wireless connections access technology, is linked into objective network; As NodeB/ base station (BTS, Base Transceiver Station) detects UE-A behind the target approach sub-district, to switch detection (Handover Detect) forwards by radio network controller (RNC)/base station controller (BSC) and give MSC-B, MSC-B carried out user's face and connected this moment, had promptly finished end to end between UE-A and the UE-B to be connected; Therefore, UE-A finishes switching (Handover Complete) forwards by RNC/BSC and gives MSC-B; MSC-B sends to CS-Proxy and inserts request signal (MAP proc access sig req) message, and indication UE-A has been linked into Target cell, can discharge the Internet resources in the SAE/LTE network; MSC-B also sends end signal request (MAP send end sig req) message to CS-Proxy, and indication UE-A switching is finished, and the source network (being the SAE/LTE network) of notice UE-A discharges all shared resources of UE-A.

In above-mentioned technical scheme, because before changing RAT, carried out territory transfer process, but do not considered when UE-A inserts the objective network failure in handoff procedure, need turn back to the problem that source network continues the transmission current business from IMS to UMTS/GERAN CS territory.

Summary of the invention

In view of this, the main purpose of the embodiment of the invention is to provide a kind of professional method and device that switches, thereby when subscriber equipment inserts the objective network failure, can be transformed into IMS from the CS territory.

For achieving the above object, the technical scheme in the embodiment of the invention is achieved in that

A kind of professional method of switching, this method comprises:

After the territory transfer process of finishing from the IMS of internet protocol multi-media system to circuit domain, when subscriber equipment inserted the objective network failure, subscriber equipment turned back to source network, sent conversation request message to IMS;

The voice continuity application server VCC AS of IMS sends conversation request message again by call service controlled function body CSCF to the opposite end of described subscriber equipment;

The opposite end of described subscriber equipment links to each other user's face path with described source network, send response message to CSCF; CSCF transmits response message to described subscriber equipment;

Subscriber equipment is transformed into IMS according to received response message from circuit domain.

A kind of professional switching device shifter also is provided in the embodiments of the invention, and this device comprises: sending module, receiver module and handover module;

Described sending module is used for after the territory transfer process of finishing from IMS to the circuit domain, and when subscriber equipment inserted the objective network failure, subscriber equipment turned back to source network, sent conversation request message to IMS;

Described receiver module is used to receive the response message by the opposite end transmission of described subscriber equipment, and sends the switching indication to described handover module;

Described reception is specially by the response message of the opposite end transmission of described subscriber equipment:

Described receiver module receives the response message of being transmitted to described subscriber equipment by described CSCF;

Described handover module, the switching indication that is used for sending according to described receiver module is transformed into IMS from circuit domain.

In summary, provide a kind of professional method and device that switches in the embodiments of the invention.In above-mentioned method and apparatus, finish IMS after the territory transfer process in CS territory, when subscriber equipment inserts the objective network failure, subscriber equipment can turn back to source network, sends conversation request message to IMS, thereby realizes from the CS territory to the territory of IMS transfer process, make subscriber equipment when inserting the objective network failure, also can turn back to again and continue current business in the source network, thereby make the current business of this subscriber equipment not interrupt, improve professional service quality.

Description of drawings

Fig. 1 is the flow chart of business switch method in the embodiment of the invention.

Fig. 2 is the schematic diagram of professional switching device shifter in the embodiment of the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

From the above, when UE-A changes the RAT failure, if UE-A still routinely method turns back to source network, then because the bearer path that UE-A links to each other with opposite end UE-B has been changed to the objective network end in the transfer process of above-mentioned territory, and the service bearer mechanism of source network and objective network and inequality, therefore UE-A and UE-B can't carry out transfer of data by above-mentioned bearer path, thereby cause the current business of UE-A to be interrupted.

In embodiments of the present invention in the technical scheme that is provided, after the territory transfer process of finishing from IMS to the CS territory, if subscriber equipment inserts the objective network failure, then subscriber equipment turns back to source network, and by send Session Initiation Protocol conversation request (INVITE) message of carrying the VDI parameter to IMS, thereby realize territory transfer process, in the source network (being the SAE/LTE network) that subscriber equipment is connected with the carrying of its opposite end from the GERAN/UMTS network, be transformed into subscriber equipment from the CS territory to IMS.

Fig. 1 is the flow chart of business switch method in the embodiment of the invention.As shown in Figure 1, the business switch method in the embodiment of the invention comprises step as described below:

Step 101, UE-A finishes and switches set-up procedure and territory flow path switch.

In this step, UE-A sends handoff request message by eNB and MME to CS-Proxy; CS-Proxy transmits to switch to Target RNC by target MSC-B and requires message; Objective network is that UE-A reserves wireless access network (RAN) resource, and sends response message by MSC-B to CS-Proxy; CS-Proxy sets up path with media gateway (MGW) and MSC-B respectively; CS-Proxy transmits INVITE by the call service controlled function body (CSCF) of IMS to voice continuity application server (VCC AS), thereby realizes the territory flow path switch from IMS to the CS territory, makes UE-B and MSC-B set up path.

Step 102, UE-A inserts objective network (for example, UMTS/GERAN network) failure;

Step 103, UE-A turns back to source network, and sends SIP conversation request (INVITE) message to the CSCF of IMS, and the territory conversion of request from the CS territory to IMS comprises parameter voice business continuity zone transmission unified resource sign (VDI) in the described INVITE;

Step 104, CSCF transmits INVITE to VCC AS;

Step 105, VCC AS sends SIP conversation request (RE-INVITE) message again by CSCF to UE-B;

Step 106, UE-B transfers its user's face path to UE-A source network according to received RE-INVITE message, and promptly SAE/LTE network (for example, public data network PDN etc.) links to each other, and sends corresponding response message (200 OK) to CSCF;

Step 107, CSCF transmits response message (200 OK) to UE-A.

At this moment, UE-A has finished the territory transfer process from the CS territory to IMS, UE-A is connected from the GERAN/UMTS network with the carrying of opposite end UE-B is transformed in the SAE/LTE network.At this moment, UE-A can by and UE-B between carrying transmission data, guaranteed the continuity of UE-A current business.

Fig. 2 is the schematic diagram of professional switching device shifter in the embodiment of the invention.As shown in Figure 2, the professional switching device shifter in the embodiment of the invention comprises: sending module, receiver module and handover module.

Described sending module is used for after the territory transfer process of finishing from IMS to the circuit domain, when subscriber equipment inserts the objective network failure, sends conversation request message to IMS;

Described receiver module is used to receive response message, and sends the switching indication to described handover module;

Described handover module, the switching indication that is used for sending according to described receiver module is transformed into the described receiver module of IMS from circuit domain, and the response message that is used for receiving sends to described handover module.

Above-mentioned professional switching device shifter can be arranged among the subscriber equipment, makes subscriber equipment when inserting the objective network failure, can realize the conversion from the CS territory to IMS.

Method and apparatus among the application of the invention embodiment, when subscriber equipment inserts the objective network failure, can be by carry out territory transfer process to CSCF transmission conversation request message from the CS territory to IMS, make subscriber equipment when inserting the objective network failure, also can turn back to again and continue current business in the source network, thereby make the current business of this subscriber equipment not interrupt, improved professional service quality.

Those skilled in the art will appreciate that message name cited in the embodiment of the invention, only is exemplary, as long as can realize purpose of the present invention, the present invention does not limit described message.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. professional method of switching is characterized in that this method comprises:

2. method according to claim 1 is characterized in that, described subscriber equipment sends conversation request message to IMS and comprises:

Subscriber equipment sends conversation request message to the CSCF of IMS;

CSCF transmits conversation request message to VCC AS.

3. method according to claim 2 is characterized in that, this method also comprises:

Comprise parameter voice business continuity zone transmission unified resource sign in the described conversation request message.

4. a professional switching device shifter is characterized in that, this device comprises: sending module, receiver module and handover module;