CN101330638A - Method for correlation of conversation control route and load-bearing control route - Google Patents

Abstract

The invention discloses a method for correlating a session control route and a bearer control route and aims to realize the effective correlation of the session control route and the bearer control route in the centralized service of IP multimedia subsystem. The method mainly comprises the following steps: The calling reference value marking the session process is generated by an initiating user equipment of the IP multimedia subsystem centralized service; in the initiating user equipment, the generated calling reference value is transmitted to the IP multimedia subsystem circuit domain control function through a packet switching session control route and bearer control route respectively, the session control route is correlated with the bearer control route by the latter one according to the calling reference value. In the method, the session is expressed with one calling reference value to ensure the effective correlation of the session control route and the bearer control route.

Description

A kind of session control path and the correlating method that carries the control path

Technical field

The present invention relates to network interconnection agreement (Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem, be called for short IMS) centralized traffic (IMSCentralized Service, be called for short ICS), relate in particular to session control path and the correlating method that carries the control path among a kind of ICS.

Background technology

IMS is a kind of IP-based network framework that is proposed by third generation partner program (3rd Generation Partnership Project is called for short 3GPP).It has made up an opening and service environment flexibly, supports multimedia application, and provides abundant multimedia service for the user.

IMS is based on the communication network framework of IP, irrelevant with access technology, except being GPRS (General Packet Radio Service, be called for short GPRS), WLAN (wireless local area network) (WirelessLocal Area Network, be called for short WLAN) etc. packet access network provide outside the business, can also be global system for mobile communications (Global System for Mobile communications, be called for short GSM), unified mobile communcations system mobile cellular networks such as (Universal Mobile Telecommunications System are called for short UMTS) provides professional.

Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit switching (CircuitSwitched is called for short CS) territory (domain), can provide basic speech business for the user, and based on the supplementary service of speech business.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic ICS.

The IMS centralized traffic has the following advantages:

(1) IMS provides consistent business for access waies such as circuit domain, packet domain, and network enabled merges;

(2) support the CS network to the evolution of IMS network;

(3) not only support to have ICS ability subscriber equipment, also support the existing subscriber equipment that does not possess the ICS ability.

Fig. 1 is the Organization Chart of IMS centralized control business, comprises following network element:

101 subscriber equipmenies (User Equipment is called for short UE)

102 Visited Mobile Switching Centers (Visited Mobile Switch Center is called for short VMSC)

103 home subscriber servers (Home Subscriber Server is called for short HSS)

104 MGCFs (Media Gateway Control Function is called for short MGCF)

105 media gateway (Media Gateway is called for short MGW)

106IMS circuit domain control function (IMS CS Control Function is called for short ICCF)

107 CSCFs (Call Session Control Function is called for short CSCF)

UE_101 process VMSC_102 establishes 3 paths to the ICCF_106 in IMS territory: session control path, carrying control path and bearer path, wherein:

The session control path if set up by the CS territory, then adopts unstructured supplementary service data (Unstructured Supplementary Service Data is called for short USSD) to carry out message transmission, and UE_101 arrives ICCF_106 by VMSC_102 and HSS_103; If set up by packet switching (PacketSwitch is called for short PS) territory, then adopt the IP transmission channel (PS Transport) in PS territory to carry out message transmission, the UE_101 session control signaling can be directly to and reaches ICCF_106;

Carrying control path, UE adopts the CS control signaling of standard to insert VMSC_102, and is linked into IMS by MGCF_104.VMSC_102 is by integrated digital service-user part signaling (ISDNUser Part, be called for short ISUP) to MGCF_104, and then adopt session initiation protocol signaling (SessionInitial Protocol is called for short SIP), by CSCF_107, arrive ICCF_106;

Bearer path, MGW_105 sets up by VMSC_102 control, is linked into IMS.

Session information is transmitted in the session control path between UE_101 and ICCF_106, and carrying control path is by the CS control signaling of standard and the carrying control messages between SIP signaling transmission CS territory and the IMS territory.At last, session control path and carrying control path need be associated at ICCF_106.This function just is equivalent to the sip user agent function that UE_101 sets up the IMS session.The foundation of bearer path and the management of bearing resource are also being controlled in carrying control path.

Fig. 2 shows the rising of ICS subscriber equipment that carry in the session control path in the prior art scheme and exhales flow process on the PS territory, idiographic flow is as follows:

Step 201, ICS calling subscriber UE-A initiate an initial session to called subscriber equipment UE-B: at first UE-A is to inquiry CSCF (Interrogating CSCF, be called for short I-CSCF)/serving CSCF (Serving CSCF, be called for short S-CSCF) initiate a session request, desire to set up the session control path with ICCF, the generic resource identifier (Uniform ResourceIdentifier is called for short URI) address and the session information that comprise UE-B in this conversation request sip message;

Step 202, S-CSCF are routed to ICCF with the conversation request sip message that receives, and comprise URI address and the session information of UE-B in this sip message equally;

Step 203, UE-A send carrying to VMSC and set up request (SETUP) message, carry remote subscriber agency (the Remote User Agent among the ICCF in the SETUP message, abbreviation RUA) public service identity (Public Service Identities, PSI) number, desire is set up a CS session by the CS flow process and the ICCF of standard;

Step 204, VMSC send initial address message (Initial Address Message is called for short IAM) to MGCF, and carry RUA PSI number;

Step 205, MGCF receive and distribute the MGW media resource behind the initial address message, and create the Invite conversation request and send to I/S-CSCF, and this moment, RUA PSI number was converted to the SIP-URI number by I-CSCF;

Step 206, S-CSCF give ICCF by initial filter standard or norm (iFC) with this Invite conversation request route;

Step 207, session control request are carried out related in ICCF and termination with the carrying request of setting up, and RUA initiates a session request to UE-B as B2BUA this moment, at first sends to CSCF;

Step 208, CSCF be by the IMS session flow process of standard, and the conversation procedure of UE-A calling subscriber and UE-B called subscriber equipment is finally finished in the session of setting up RUA and UE-B.

In above-mentioned prior art flow process, carrying control path and session control path carry out relatedly just carrying out follow-up conversation procedure in the ICCF requirement.But when carrying foundation request is concurrent with the session control request, carrying is set up in request and the session control request owing to do not carry the interrelated information in carrying control path and session control path, UE-A initiates only to have carried when request is set up in carrying RUA PSI number, this number is pre-configured in a UE static number, separately by this parameter can't in ICCF, carry control the path related with the session control path.Therefore need to propose a kind of session control path and the correlating method that carries the control path, guarantee that both carry out association.

Summary of the invention

Technical problem to be solved by this invention is to be to provide in the centralized traffic of IP Multimedia System the correlating method of a kind of session control path with carrying control path, is used for realizing the session control path and carries the effective related of control path.

In order to solve the problems of the technologies described above, the invention provides a kind of session control path and the correlating method that carries the control path, be applied to IP Multimedia System, comprising:

(1) the initiation subscriber equipment of described IP Multimedia System centralized traffic generates the Call Reference Value of this conversation procedure of sign;

(2) described initiation subscriber equipment sends the session that carries described Call Reference Value by the session control path on the packet-switched domain to the IP Multimedia System circuit domain control function and sets up request;

(3) described initiation subscriber equipment sends the circuit domain call that carries described Call Reference Value by the control of the carrying on circuit domain path to described IP Multimedia System circuit domain control function and sets up request;

(4) described IP Multimedia System circuit domain control function is associated described session control path and described carrying control path according to Call Reference Value in the described session foundation request and the Call Reference Value in the described circuit domain call foundation request.

Above-mentioned correlating method, Call Reference Value described in its step (1) can described this conversation procedure of unique identification.

Above-mentioned correlating method, Call Reference Value can generate at random described in its step (1).

Above-mentioned correlating method, Call Reference Value described in its step (2) can be set up the header field of asking by described session and carry.Further, described Call Reference Value can carry by the contact head that described session is set up in the header field of asking.

Above-mentioned correlating method, Call Reference Value described in its step (2) can be set up the session description protocol parameters of asking by described session and carry.Further, described Call Reference Value can carry by increase an attribute in described session description protocol parameters.

Above-mentioned correlating method is initiated subscriber equipment and is initiated new session and use identical bearer path described in its step (2), then can carry described Call Reference Value.Further, above-mentioned correlating method, the described association in its step (4) also comprises described in the step (2) and to initiate subscriber equipment when initiating new session, can pass through described Call Reference Value, and circuit domain call is associated with new session on the session control path.

Above-mentioned correlating method, its described step (3) can comprise:

(31) described initiation subscriber equipment sends the carrying that carries described Call Reference Value to Visited Mobile Switching Center and sets up request, and described Call Reference Value can be carried to user profile by the user;

(32) described Visited Mobile Switching Center sends the initial address message that carries described Call Reference Value to MGCF;

(33) after described MGCF is received described initial address message, described Call Reference Value is transformed in the conversation initiating protocol message;

(34) described MGCF is created an Invite conversation request that carries described session initiation protocol, and sends to described IP Multimedia System circuit domain control function by CSCF.

Compared with prior art, the present invention comes this session is identified owing to all carry Call Reference Value on session control path and carrying control path, has guaranteed the effective related of session control path and carrying control path.

Description of drawings

Fig. 1 is the group-network construction schematic diagram of IP Multimedia System IMS centralized control business;

Fig. 2 is that the rising of ICS subscriber equipment that carry on the PS territory in the session control path in the prior art exhaled schematic flow sheet;

Fig. 3 is the inventive method embodiment schematic flow sheet;

Fig. 4 is the schematic flow sheet of an Application Example of the inventive method.

Embodiment

Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail.

Thinking of the present invention is: carry out the session control signaling carrying when the ICS subscriber equipment adopts PS, and when adopting CS to carry out the bearer control signalling carrying, one of definition is public unique and at random in the carrying request of setting up and session control request, identify the Call Reference Value of this conversation procedure, carrying control path and session control path can be undertaken effective relatedly by Call Reference Value at ICCF like this, and carry out follow-up conversation procedure.

Fig. 3 shows the inventive method embodiment, comprises the steps:

Step 301, ICS initiated subscriber equipment before initiating the caller process, generated the Call Reference Value of unique this conversation procedure of sign at random;

Step 302, initiation subscriber equipment send session by the session control path on the PS territory to ICCF and set up request, carry the Call Reference Value that is generated in this request;

Step 303, initiation subscriber equipment send the CS setup requests by the control of the carrying on circuit domain path to ICCF, also carry the Call Reference Value that is generated in this request;

Step 304, ICCF, control the path with session and are associated with carrying control path with the Call Reference Value in the setup requests of CS territory according to the Call Reference Value in the PS territory session foundation request.

In the above-mentioned steps 301, initiate this caller process that Call Reference Value that UE generates must this UE of unique identification be initiated between this UE and ICCF.For this reason, initiating the Call Reference Value that UE generated can generate at random.

In the above-mentioned steps 302, UE can carry Call Reference Value by the header field or Session Description Protocol (Session Description Protocol the is called for short SDP) parameter of conversation request sip message.

In the above-mentioned steps 302, if this initiation UE initiates new session and uses identical bearer path from PS session control path, then setting up in the request in session also needs to carry this Call Reference Value, and ICCF utilizes this Call Reference Value to carry out related with the CS calling session that PS controls on the path.

In the above-mentioned steps 303, UE utilizes call setup (Setup) request message, adopt the user to user profile (User to User Information, be called for short UUI) carry, Call Reference Value is transferred to VMSC, VMSC utilizes the UUI in the initial address message that Call Reference Value is sent MGCF again, and MGCF in sip message, sends the UUI information translation to ICCF again.

In the above-mentioned steps 304, ICCF will carry the request of foundation, the session control request is carried out also further carrying out follow-up calling procedure after association, the merging.

Like this, carry same Call Reference Value in request message and the conversation request message by setting up in carrying, make carrying control path and session control path in ICCF, carry out effective association, can realize further that the session on the PS control path is associated with the CS calling according to this Call Reference Value.

Fig. 4 shows an Application Example of the present invention, exhales flow process for the rising of ICS subscriber equipment that carry on the PS territory in the session control path, and concrete steps are:

Before step 401, ICS initiation user equipment (UE)-A make a call, according to certain random code create-rule, generating the Call Reference Value unique, at random of this conversation procedure of sign, can be compositions such as character string and numeral; Wherein, Call Reference Value adopts at random and generates, and can prevent that other mobile phone from using identical Call Reference Value, avoids causing the confusion of conversation procedure;

Step 402, UE-A initiate an initial session to called subscriber equipment UE-B: at first UE-A initiates a session request to ICCF by I/S-CSCF, sets up the session control path; The URI address and the session information that comprise UE-B in this conversation request sip message need carry the Call Reference Value that UE-A generates in the session information; Call Reference Value adopts the contact head in the sip message header field to carry, and should be contact:sip:xxxxxx@10.10.10.10 with among the embodiment; Wherein xxxxxx promptly represents Call Reference Value; In the Another application embodiment of the inventive method, be in the SDP of sip message body parameter, to increase a new attribute to carry Call Reference Value, specifically be defined attribute a in SDP, its value equals xxxxxx, and wherein xxxxxx represents Call Reference Value;

Step 403, this conversation request sip message of S-CSCF route carry URI address and the session information of UE-B too to ICCF in this sip message, and also carry the Call Reference Value that UE-A generates in the session information;

Step 404, UE-A send carrying to VMSC and set up request (SETUP) message, CS flow process and ICCF by standard set up a CS session, carry the Call Reference Value of RUA PSI number and UE in this SETUP message, Call Reference Value can adopt the UUI in the CS standard signaling to carry;

Step 405, VMSC send initial address message to MGCF, and carry the UUI of RUA PSI number and bearing call reference value;

Step 406, MGCF distribute the MGW media resource after receiving initial address message, and UUI is transformed in the sip message by MGCF;

Step 407, MGCF create a new Invite conversation request, and the SIP information of carrying UUI and the URI number of RUA are arranged in this request, and S-CSCF is issued in this request;

Step 408, S-CSCF give ICCF by initial filter standard or norm with this Invite conversation request route;

Step 409, session control request merge at ICCF with carrying foundation request, and ICCF carries out effective related to the session control path with carrying control path by request of identification session control and the Call Reference Value that carries in the request of foundation;

After UE-A and UE-B session foundation, UE-A can call out maintenance (callhold) to current sessions, and initiates the calling to third party (as UE-C); UE-A can carry out new session in PS session control path like this, and this new session at this moment is also by this Call Reference Value, and it is related to realize that session new on the PS control path and CS call out;

RUA among step 410, the ICCF initiates a session request to UE-B as B2BUA this moment, carries out follow-up conversation procedure.

On existing technical foundation, when session control request and carrying foundation request are concurrent, do not carry the related information relevant in two request messages with this session.The inventive method is by the improvement to techniqueflow, set up the Call Reference Value that carries the UE generation in the request in carrying, also carry identical Call Reference Value in session control request sip message, effective association just can be carried out by public unique and Call Reference Value at random in carrying control path and session control path in ICCF like this.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong within the protection range of the appended claim of the present invention.

Claims (10)

1, the correlating method in a kind of session control path and carrying control path is applied to IP Multimedia System, it is characterized in that, comprising:

(1) the initiation subscriber equipment of described IP Multimedia System centralized traffic generates the Call Reference Value of this conversation procedure of sign;

(2) described initiation subscriber equipment sends the session that carries described Call Reference Value by the session control path on the packet-switched domain to the IP Multimedia System circuit domain control function and sets up request;

(3) described initiation subscriber equipment sends the setup requests that carries described Call Reference Value by the control of the carrying on circuit domain path to described IP Multimedia System circuit domain control function;

(4) described IP Multimedia System circuit domain control function is associated described session control path and described carrying control path according to Call Reference Value in the described session foundation request and the Call Reference Value in the described circuit domain call foundation request.

2, the method for claim 1 is characterized in that, described this conversation procedure of Call Reference Value unique identification described in the step (1).

3, the method for claim 1 is characterized in that, Call Reference Value generates at random described in the step (1).

4, the method for claim 1 is characterized in that, Call Reference Value described in the step (2) can be set up the header field of asking by described session and carry.

5, method as claimed in claim 4 is characterized in that, the contact head that described Call Reference Value is set up in the header field of asking by described session carries.

6, the method for claim 1 is characterized in that, Call Reference Value described in the step (2) can be set up the session description protocol parameters of asking by described session and carry.

7, method as claimed in claim 6 is characterized in that, described Call Reference Value carries by increase an attribute in described session description protocol parameters.

8, the method for claim 1 is characterized in that, initiates subscriber equipment described in the step (2) and initiates new session and use identical bearer path, then carries described Call Reference Value.

9, method as claimed in claim 8 is characterized in that, circuit domain call is by described Call Reference Value, is associated with new session on the session control path.

10, the method for claim 1 is characterized in that, described step (3) comprising:

(31) described initiation subscriber equipment sends the carrying that carries described Call Reference Value to Visited Mobile Switching Center and sets up request, and described Call Reference Value is carried to user profile by the user;

(32) described Visited Mobile Switching Center sends the initial address message that carries described Call Reference Value to MGCF;

(33) after described MGCF is received described initial address message, described Call Reference Value is transformed in the conversation initiating protocol message;

(34) described MGCF is created a described setup requests that carries described session initiation protocol, and sends to described IP Multimedia System circuit domain control function by CSCF.

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