CN101087474B

CN101087474B - A method for capturing service status of voice call continuous service

Info

Publication number: CN101087474B
Application number: CN200610093620XA
Authority: CN
Inventors: 郝振武; 孙闵; 沈岷
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2006-06-19
Filing date: 2006-06-19
Publication date: 2012-01-11
Anticipated expiration: 2026-06-19
Also published as: CN101087474A

Abstract

A method of obtaining operation state of voice calling continuity operation, when network entity needs operation state information of voice calling continuity operation VCC, it builds subscription request message, that is SUBSCRIBE message, and it is sent to VCC application server, the message at least takes network entity mark of subscriber, mark of subscribed resource and VCC operation affair package; when the VCC application server receives the SUBSCRIBE message, the state of trigger is returned, current VCC operation information of subscribed resource is sent to the network entity as subscriber via NOTIFY message; the network entity receives the NOTIFY message, obtains VCC operation state information needed, process as corresponding operation. The invention is applied in network entities to obtain operation state of VCC conversation for operation.

Description

A kind of method of obtaining the service condition of voice call continuity service

Technical field

The present invention relates to IP Multimedia System (IP Multimedia Core Network Subsystem; IMS) voice call continuity service (Voice Call Continuity; VCC), relate in particular to the method for the service condition that obtains the IP Multimedia System voice call continuity service.

Background technology

Utilize IP Multimedia System (IP Multimedia Core Network Subsystem; IMS) technology; Can (Wireless Local Area Network WLAN) waits on the packet network VoIP (Voice over Internet Protocol) is provided business at WLAN.Utilization should technology, and the most of business on the circuit domain (Circuit SwitchedDomain) such as GSM can be provided to the user in the area that has wireless coverages such as WLAN.

(Voice Call Continuity, VCC) business is a 3GPP tissue (3 to voice call continuity service ^RdGeneration Partnership Project) proposes professionally, can realize the voice communication of CS territory and, guarantee the continuity of voice call based on the seamless switching of IMS framework WLAN territory voice communication.

The VCC business has following benefit:

(1) a part of voice call transfer is covered to WLAN on, alleviate the anxiety of GSM/UMTS (Global System for Mobile Communications/UniversalMobile Territory System) Radio Resource in the WLAN coverage territory;

(2) the multiple business pattern is provided, increases professional income;

(3), adopt the IMS framework that fused business can be provided for wired VoIP operator.

Professional in order to realize VCC, introducing VCC AS (Application Server, application server) realizes the centralized control that VCC is professional in the IMS territory, accomplish the audio call of VCC user terminal and set up process, and the switching between control CS territory and the IMS calling.

VCC AS accomplishes the foundation and the switching controls of basic call, and based on speech business on other business, like supplementary service, prepayment service etc., then realize by other application servers.In the ordinary course of things; Other business need not know that the VCC user terminal still is to carry out voice communication from the CS territory from the IMS territory; But some service needed is obtained the state of VCC session; Comprise that session is VCC session or common session (CS calls out or IMS calls out), user terminal present located domain information, and other information relevant with access.

Example 1: prepayment service

The resource shared from CS territory and WLAN access is different; The also corresponding difference of conversation rate, different with traditional payment system, in the call process; User terminal possibly switch between two kinds of different access waies; Payment system must be adjusted rate in real time according to the difference of user mode access, guarantees the accuracy of chargeing.

Example 2:IMS message (IMS Messaging) business

In IMS, define instant message (Immediate Messaging) and two kinds of message of conversation-based message (Session-based Messaging).When not having the IMS session between the communicating pair, can use instant messaging, when having the IMS session between the both sides, can on the basis of existing session, set up end-to-end connection, realize the message transmission.

As a VCC user during, when needs carry out message communicating with other users, possibly there is following situation in the convention business of using the conference applications server to provide:

1) when the registration in the IMS territory of VCC user terminal, and through the IMS conversation, can use Session-based Messaging this moment;

2) when the registration in the IMS territory of VCC user terminal, but through the CS conversation, can only use Immediate Messaging this moment

3) if the IMS territory is unregistered, through the CS conversation, can't use this moment IMS Message professional, must use other modes to carry out message communicating, like short message.

Can find out that from top two examples application server need obtain the character of VCC user terminal session, the real time information in territory, session place, and might need other information.

Also in IMS, do not obtain the method for the professional service condition of continuous voice call VCC at present, can address the above problem.

Summary of the invention

The technical problem that the present invention will solve provides a kind of method of in IMS, obtaining the professional service condition of continuous voice call VCC, can be applied to network entity (application server, network element, terminal etc.) and obtain the service condition of VCC session, supplies professional the use.

In order to solve the problems of the technologies described above, the invention provides a kind of method of obtaining the service condition of voice call continuity service, may further comprise the steps:

When (a) network entity need be known the business state information of voice call continuity service VCC; Make up subscription request message; Be SUBSCRIBE message; And this message sent to the VCC application server, carried at least in the message as this network entity sign of subscriber, subscribed resource identification and VCC business event bag;

(b) after said VCC application server is received said SUBSCRIBE message, trigger the state loopback, the VCC business state information that subscribed resource is current is through notification message, and promptly NOTIFY sends to the said network entity as the subscriber;

(c) after said network entity receives NOTIFY, therefrom obtain required VCC business state information, handle according to correspondent service logic.

Further, said method also can have following characteristics: said network entity is application server or core network element or terminal.

Further, said method also can have following characteristics: VCC ID or the VCC service conversation sign of said subscribed resource identification for from service request, obtaining.

Further; Said method also can have following characteristics: in the said step (a); Fill in said VCC application server identifier or subscribed resource identification in the Request-URI field in said SUBSCRIBE message; Fill in said network entity sign in the From field, in the To field, fill in the sign of subscribed resource, fill in said VCC business event bag in the Event field.

Further; Said method also can have following characteristics: after said step (b) VCC application server is received said SUBSCRIBE message, earlier this SUBSCRIBE message is carried out authentication, if authentication is passed through; Return the subscription success message; And carry out the state loopback immediately, otherwise return the subscription failed message, finish.

Further, said method also can have following characteristics: said VCC session state information comprises that VCC calls out the domain information at place.

Further; Said method also can have following characteristics: said step (c) also comprises step (d) afterwards: when the VCC session status changes; The VCC application server sends to the network entity of subscribing to this state information through the NOTIFY VCC session state information that subscribed resource is current; After said network entity is received this NOTIFY, therefrom obtain required VCC business state information, handle according to correspondent service logic.

Further, said method also can have following characteristics: after said VCC application server is received said SUBSCRIBE message, also return to said network entity and subscribe to acknowledge message 200 OK; Said network entity is received NOTIFY, also returns notification acknowledgement 200 OK to said VCC application server.

Further, said method also can have following characteristics: the interacting message between said network entity and the said VCC application server is all transmitted through service call conversation control function and is accomplished.

Further; Said method also can have following characteristics: when said network entity need be cancelled the subscription of VCC service condition; Use the mechanism of cancelling subscriptions that defines in the IP Multimedia System to cancel subscription to the VCC service condition; After this subscribed to cancellation, the VCC application server discharges with this subscribed to relevant resource.

Further; Said method also can have following characteristics: network entity is to set up request message in the session that receives the transmission of VCC application server in the said step (a); After being INVITE, make up this SUBSCRIBE message, to obtain the professional correlation behavior of VCC.

Further; Said method also can have following characteristics: after the VCC session status changed in the said step (d), the VCC application server comprised that through the VCC session state information that NOTIFY sends to said network entity VCC calls out the domain information at place and the information that this state changes.

Compared with prior art; Because the present invention is in IP Multimedia System VCC business; Adopted the method for obtaining the VCC service condition through sip event notice extension mechanism (Session Initiation Protocol Event NotificationMechanism); Therefore reached network entity (other application servers, network element, terminal etc.) and obtained the effect of VCC service condition, satisfied professional demand to the VCC application server.Simultaneously do not influence network architecture, message flow, have good flexibility, exploitativeness and autgmentability.

Description of drawings

Fig. 1 is a VCC business framework sketch map;

Fig. 2 obtains VCC service condition interaction figure through SIP notice extension mechanism;

Fig. 3 is the flow chart that the VCC application server receives subscribe request.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.

Fig. 1 is a VCC business framework sketch map; Show with the VCC service condition and obtain related network element and annexation; Comprise UE 11 (User Equipment; Subscriber equipment), CS network 12 (CircuitSwitched; Circuit switching), IMS core net 13 (IP Multimedia Core Network Subsystem, IP Multimedia System), VCC AS 14 (Voice Call Continuity Application Server, application server for continuity of voice call), other AS 15 (Other Application Server; Other application server), other equipment 18 (like the equipment of subscriber terminal equipment, IMS core net, it also can be subscribed to the VCC service condition), other networks 16, ISC interface 17 (interface of the service call conversation control function S-CSCF in application server and the IMS core net).

UE comprises CS and two modules of IMS, can set up to call out with CS territory and IMS territory respectively to be connected, and can control the switching in two territories.UE inserts IMS or directly inserts IMS through CS, realizes centralized control by the VCC AS among the IMS, provides VCC professional.Also have the network equipments such as other application servers in the network, the execution of its service logic needs the service condition of VCC, can pass through the mutual VCC service condition of ISC interface.

Fig. 2 is the interaction figure that obtains the VCC service condition through SIP notice extension mechanism, has described the acquisition process to the VCC service condition on the whole.Be that example describes with other application server AS 1 except that VCC AS below, other network entity (like network element, terminal etc.) reciprocal process is similar.Reciprocal process may further comprise the steps:

Step 201 according to business demand, need be obtained the VCC service condition like AS1, makes up SUBSCRIBE message (being subscription request message):

In the Request-URI of message field, fill in the sign of VCC AS sign or subscribed resource; If fill in VCC AS sign; Represent that subscribed resource is positioned at the position of VCC AS; Concrete subscribed resource is represented in the To field, if fill in the sign of subscribed resource, is then confirmed the position of VCC AS according to subscribed resource identification by the IMS core net.

Fill in the subscriber in the From field, i.e. the sign of AS1.

In the To field, fill in the sign of subscribed resource.

In the Event field, fill in the VCC business event bag of redetermination; The content that incident bag (Event Package) expression is subscribed to; If it is VCC business event bag that AS1 subscribes to, VCC AS only sends to AS with the incident bag relevant with VCC so, is equivalent to a filter criteria.Other content is filled in according to the definition of IMS.

AS1 can make up this SUBSCRIBE message, to obtain the professional correlation behavior of VCC after receiving the session foundation request INVITE that VCC AS sends.

Above-mentioned subscribed resource identification can be the VCC ID of from service request, obtaining; Or the VCC service conversation that from service request, obtains sign, the VCC session identification can obtain with other modes through the session identification parameter of the VCC service identification in the request of activating business.

Step 202, AS1 sends to S-CSCF with the SUBSCRIBE message that makes up;

Step 203, S-CSCF arrives VCC AS according to initial filter standard or norm and route principle with the SUBSCRIBE forwards;

Step 204, VCC AS carries out authentication to subscribe request, and whether decision accepts subscriber's subscribe request, if accept subscribe request, then continues to carry out next step, otherwise, return the subscription failed message, finish;

When authentication, generally be authentication to the subscriber, whether legal, in operation, may have other authentication content simultaneously if seeing, as according to the operation strategy, can limit some subscriber and subscribe to, though it is legal.This step is optional.

Step 205, VCC AS sends to S-CSCF and subscribes to acknowledge message 200 OK;

Step 206, S-CSCF transmits 200 OK message to AS1;

Step 207 after VCC AS receives subscribe request, triggers the state loopback, makes up NOTIFIY message immediately, and the VCC business state information that subscribed object is current sends to subscriber AS1;

Step 208, VCC AS sends NOTIFY to S-CSCF, in message, carries the VCC business state information, comprises that VCC calls out the contents such as domain information at place;

Step 209, S-CSCF transmits NOTIFY to AS1;

Step 210 after AS1 receives NOTIFY, is sent notification acknowledgement 200OK to S-CSCF;

Step 211, S-CSCF transmits notification acknowledgement 200 OK to VCC AS;

Step 212, the subscribed person's of VCC session status changes in VCC AS, and like territory switching, end of calling etc., the VCC business state information that VCC AS need be current with subscribed person sends to the subscriber;

Step 213, VCC AS sends NOTIFY to S-CSCF, in message, carries the VCC business state information, comprises that VCC calls out contents such as the domain information at place, territory switching, conversation end;

Step 214, S-CSCF transmits NOTIFY to AS1;

Step 215 after AS1 receives NOTIFY, is sent notification acknowledgement 200 OK, and AS1 can obtain VCC session character from NOTIFY, VCC calls out the VCC business state informations such as domain information at place, and handles according to correspondent service logic;

Step 216, S-CSCF transmits notification acknowledgement 200 OK to VCC AS.

When AS1 will cancel the subscription of VCC service condition, can use the mechanism that cancels subscriptions that defines among the IMS, after subscribing to cancellation, VCC AS discharges and subscribes to relevant resource.

Fig. 3 is the flow chart that the VCC application server receives subscribe request, has described the processing procedure of VCC AS to the VCC service condition, may further comprise the steps:

Step 301, VCC AS receives subscription request message;

Step 302 is carried out authentication to request, judges whether to accept subscription, if accept, changes step 303 over to, otherwise jumps to step 305;

Step 303 according to the information in the subscribe message, is confirmed subscribing relationship, sets up and subscribes to session, sends to the subscriber and subscribes to acknowledge message 200 OK;

Step 304 triggers loopback immediately, calls the NOTIFY notification procedure current VCC business state information is returned the subscriber, and process finishes;

Step 305 is returned the subscription failed message, observes IMS related protocol regulation, and process finishes.

Adopt the inventive method; Be applied in the IP Multimedia System voice call continuity service; Can make other network entities (application server, network element, terminal etc.) obtain the service condition of VCC session, and utilize these state informations to carry out service logic control, satisfy business demand through sip event notice extension mechanism; And network configuration, operation flow are not had influence, have good exploitativeness and autgmentability.

Claims

1. method of obtaining the service condition of voice call continuity service may further comprise the steps:

When (a) network entity need be known the business state information of voice call continuity service VCC; Make up subscription request message; Be SUBSCRIBE message; And this message sent to the VCC application server, carried the network entity sign as the subscriber, the sign and the VCC business event bag of subscribed resource in the message at least;

2. the method for claim 1 is characterized in that, said network entity is application server or core network element or terminal.

3. the method for claim 1 is characterized in that, VCC ID or the VCC service conversation sign of said subscribed resource identification for from service request, obtaining.

4. the method for claim 1; It is characterized in that; In the said step (a), fill in the sign of VCC application server identifier or subscribed resource in the Request-URI field in said SUBSCRIBE message, fill in said network entity sign in the From field; In the To field, fill in the sign of subscribed resource, fill in said VCC business event bag in the Event field.

5. the method for claim 1 is characterized in that, in the said step (b); After the VCC application server is received said SUBSCRIBE message, earlier this SUBSCRIBE message is carried out authentication, if authentication is passed through; Return the subscription success message; And carry out the state loopback immediately, otherwise return the subscription failed message, finish.

6. the method for claim 1 is characterized in that, said VCC business state information comprises that VCC calls out the domain information at place.

7. the method for claim 1; It is characterized in that; Said step (c) also comprises step (d) afterwards: when the VCC session status changed, the VCC application server sent to the network entity of subscribing to this state information through the NOTIFY VCC business state information that subscribed resource is current, after said network entity is received this NOTIFY; Therefrom obtain required VCC business state information, handle according to correspondent service logic.

8. the method for claim 1 is characterized in that, after said VCC application server is received said SUBSCRIBE message, also returns to said network entity and subscribes to acknowledge message 200 OK; Said network entity is received NOTIFY, also returns notification acknowledgement 200 OK to said VCC application server.

9. the method for claim 1 is characterized in that, the interacting message between said network entity and the said VCC application server is all transmitted through service call conversation control function and accomplished.

10. the method for claim 1; It is characterized in that; When said network entity need be cancelled the subscription of VCC service condition; Use the mechanism of cancelling subscriptions that defines in the IP Multimedia System to cancel the subscription to the VCC service condition, after this subscribed to cancellation, the VCC application server discharges with this subscribed to relevant resource.

11. the method for claim 1; It is characterized in that network entity is to set up request message in the session that receives the transmission of VCC application server in the said step (a), promptly behind the INVITE; Make up this SUBSCRIBE message, to obtain the professional correlation behavior of VCC.

12. method as claimed in claim 7; It is characterized in that; After the VCC session status changed in the said step (d), the VCC application server comprised that through the VCC business state information that NOTIFY sends to said network entity VCC calls out the domain information at place, territory switching, conversation end.