CN101170558A - Method for call session controller to identify private user identifier in session - Google Patents

Abstract

The invention discloses the method that a call session controller identifies private user identification in the course of session. The invention relates to the procedure research of session initial protocol(SIP) of a core network element call session controller(CSCF) in a multimedia sub-system(IMS). The invention comprises the following steps: (1): in the course that IMS receives the registration of user terminal, the CSCF distributes the IMPI of the user terminal or the identity identification representing IMPI to the user terminal through SIP signaling information; (2): when the user terminal originates session request, the IMPI saved by the user terminal or the identity identification representing IMPI is carried to the CSCF through the SIP signaling; (3): in the course of session, the CSCF acquires and identifies the IMPI directly from the SIP signaling and implements subsequent session processing. The invention has sound compatibility and sound expandability; meanwhile, the invention can fully utilizes system resource and guarantee the system to have relative high stability.

Description

Call session controller is determined the method for private user identity in conversation procedure

Technical field

The present invention relates to the flow process research of the session initiation protocol (SIP) of core network element call session controller (CSCF) in a kind of IP multimedia subsystem, IMS (IMS); Specifically, relate to user terminal registration process and user terminal conversation procedure.

Background technology

IMS is the trend of network technology and business development, in the industry cycle receives much concern at present, generally acknowledges it is an important step of fixed network and mobile network evolution, is the focus that future network merges, and is the optimal path of realizing the fusion (FMC) of fixed communication and mobile communication.

CSCF is the nucleus equipment of IMS network control layer as the important node of call treatment, has the controlled function that realizes IMS territory session.CSCF is responsible for to customer multi-media session and handles, and its function comprises Multimedia session control, and address translation and business held consultation is finished service conversion etc.CSCF handles the signaling message among the IMS as server (SIP), is used to finish called gateways function, call business triggering function and routing function etc.

In the conversation procedure, call subscriber terminal (UE) is when initiating a session request, public subscriber identification (IMPU) of oneself and called public subscriber identification (IMPU) are sent to CSCF together by the SIP signaling, CSCF must determine its private user identity (IMPI) by the caller ID information that comprises in the SIP signaling that receives, in order to obtain the service that caller is ordered.

What exist in the existing method is not enough as follows:

1) owing to the corresponding a plurality of IMPI of IMPU possibility, the CSCF of IMS must could determine the IMPI of session initiator by other additional conditions;

2) CSCF of IMS need carry out comparatively loaded down with trivial details inquiry and calculating in order to determine the IMPI of session initiator, can not make full use of system resource.

Summary of the invention

Purpose of the present invention just is to overcome the shortcoming and defect that prior art exists, and provides a kind of call session controller to determine the method for private user identity in conversation procedure.

The present invention includes the following step:

1. the IMS network is in accepting the registration process of user terminal, and CSCF distributes to user terminal with its IMPI (perhaps representing the identify label of IMPI) by the SIP signaling message;

2. user terminal is when initiating a session request, and the IMPI (perhaps representing the identify label of IMPI) with its preservation carries to CSCF by the SIP signaling;

3. CSCF can directly obtain from the SIP signaling and definite IMPI, carries out subsequent session and handles.

Whole process is transparent for user terminal.

Operation principle of the present invention is:

UE preserves the Service-Route header field content of obtaining from CSCF in registration process, during initiation session (or other initialization request) the Service-Route content of preserving is sent to CSCF as the clauses and subclauses of route.CSCF is kept at IMPI in the Service-Route header field in the UE registration process and sends to UE, extracts user IMPI in conversation procedure from the Route header field.

The present invention has the following advantages and good effect:

1. solved the difficulty of the CSCF of IMS effectively at the IMPI that determines session initiator;

2. by in session initiation process to control and the discriminating of IMPI, further guaranteed security of conversation.

3. reduce the calculating query script of the CSCF of IMS, improve the disposal ability of the CSCF of IMS.

In a word, the present invention, does not need to revise the present interfaces standard yet, thereby has good compatibility and extensibility without any influence existing network infrastructure and business realizing; Simultaneously can make full use of system resource, the system of assurance has advantages of higher stability.

Description of drawings

Fig. 1 is a step of the present invention register flow path schematic diagram 1.;

Fig. 2 is a step of the present invention session schematic flow sheet 3..

English to Chinese:

IP one Internet Protocol;

The IMS-IP multimedia subsystem, IMS;

The fusion of FMC-fixed communication and mobile communication;

The SIP-session initiation protocol;

IMPI-private user identity sign;

IMPU-public user identity sign;

The CSCF-call session controller;

P-CSCF-agent call conversation controller;

I-CSCF-inquiry call session controller;

S-CSCF-service call conversation controller;

The HSS-home subscriber server;

The UE-user terminal;

Service-Route-SIP message header field provides the clauses and subclauses of route to the initialization request of user's S-CSCF at UE;

Route-SIP message header field is used for the routing forwarding of request message.

Embodiment

Describe in detail below in conjunction with drawings and Examples.

One, 1. about step

The Service-Route header field carries IMPI or represents the identify label of IMPI in the registration process;

Wherein: Service-Route-SIP message header field provides the clauses and subclauses of route to the initialization request of user's SCSCF at UE.

As Fig. 1, the process that UE initiates registration to the IMS network comprises the following steps:

(1) after UE obtains the IP connection, can carry out the IMS registration.For this reason, UE sends log-on message to P-CSCF (public identify, privately owned sign, home network domain name, UE IP address).

Receive after the Register information flow that (2) P-CSCF must check " home domain name ", to find the entrance (that is: I-CSCF) of home network.P-CSCF must send Register information and flow to I-CSCF (P-CSCF address, public identify, privately owned sign, P-CSCF network identity, UE IP address).Name-address resolution mechanism is used for determining from " home domain name " address of home network.The P-CSCF network identity is a word string, is used for the network (for example: the P-CSCF network identity may be the domain name of P-CSCF network) at home network sign P-CSCF place.

(3) I-CSCF must transmission information flow to HSS (public identify, privately owned sign, P-CSCF network identity).HSS must check whether the user registers.According to the signatory situation of user, and operator's restriction/constraint, HSS must be pointed out whether the user allows to register at this P-CSCF network (being identified by the P-CSCF network identity).

(4) response sends to I-CSCF from HSS.If HSS knows, must comprise a S-CSCF name, and S-CSCF ability (selecting a new S-CSCF if necessary).When comprising S-CSCF name and ability simultaneously in the response, I-CSCF can carry out a new distribution.I-CSCF must carry out a new S-CSCF selection function based on the ability of returning when resettability.If in the inquiry failure of HSS, refusal is registration specifically.

(5) I-CSCF uses the name of S-CSCF, by name-address resolution mechanism, and the address of decision S-CSCF.I-CSCF also may determine the name of suitable home network contact point based on the information of receiving from HSS.I-CSCF sends to the S-CSCF that chooses with register information flow (P-CSCF address/name, public identify, privately owned sign, P-CSCF network identity, UE IP address, I-CSCF (THIG)-when needing the networking configuration to hide) subsequently.The home network contact point will be used for that signaling is initiated in session by P-CSCF and be forwarded to home network.

(6) S-CSCF must send (public identify, privately owned sign, S-CSCF name) to HSS.

(7) HSS is necessary for this user and preserves the S-CSCF name, and return information stream (user profile) is given S-CSCF.The user profile that is delivered to S-CSCF from HSS must comprise one or more name/address information, is used for access service controlling platform when the user is registered in this S-CSCF.The user that S-CSCF is necessary for appointment preserves information.Except name/address information, security information also can send to S-CSCF and use.

(8) S-CSCF carries IMPI information in 200 (OK) message, is included in the User Part of Service-Route, for example:

Service-Route:＜sip:33@scscf.zgwri.com; Lr〉(index values of 33 expression IMPI)

Service-Route:＜sip: Iuritidi62aoldle@scscf.zgwri.comLr〉(iuritidi62aoldle represents the value after IMPI encrypts)

(9) S-CSCF must return 200 OK message (home network contact information) and give I-CSCF.

(10) I-CSCF must send 200 OK (home network contact information) and give P-CSCF.I-CSCF must discharge all log-on messages after sending information flow 200 OK.

(11) the necessary store home network contact information of P-CSCF, concurrent carry information flows 200 OK and gives UE

(12) UE storing message head Service-Route, with the content of Service-Route a part as set of routes, owing to comprised user IMPI information in the Service-Route, also had this information in the Route header field of sip message when carrying out conversation request.

Two, 3. about step

S-CSCF extracts IMPI in the conversation procedure from the Route header field;

Wherein:

S-CSCF-service call conversation controller; Route-SIP message header field is used for the routing forwarding of request message.

As Fig. 2, the session flow process comprises the following steps:

Be that the user terminal conversation request is initiated process, Fig. 2 has only marked the step that relates among the present invention:

(1) user 1 UE sends the SIP URI that INVITE asks user 2, load content in Service-Route (obtaining in the user's 1 registration process) message header of being stored in route, has been comprised user 1 IMPI information this moment in the route.User 1 at first sends to request user 1 P-CSCF.

(2) user 1 P-CSCF is forwarded to request user 1 S-CSCF.

(3) user 1 S-CSCF extracts user 1 IMPI information from route, has removed the processing time that user 1 IMPI is calculated in inquiry from.

Claims (3)

1. the method for a call session controller definite private user identity in conversation procedure is characterized in that comprising the following steps:

1. IMS is in accepting the registration process of user terminal, and CSCF is with its IMPI or represent the identify label of IMPI to distribute to user terminal by the SIP signaling message;

2. user terminal is when initiating a session request, and with the IMPI of its preservation or represent the identify label of IMPI, carries to CSCF by the SIP signaling;

3. in the conversation procedure, CSCF can directly obtain from the SIP signaling and definite IMPI, carries out subsequent session and handles;

Wherein:

The IMS-IP multimedia subsystem, IMS; The CSCF-call session controller;

IMPI-private user identity sign; The SIP-session initiation protocol.

2. by the method for the described definite private user identity of claim 1, it is characterized in that step is 1.:

The Service-Route header field carries IMPI or represents the identify label of IMPI in the registration process;

Wherein:

Service-Route-SIP message header field provides the clauses and subclauses of route to the initialization request of user's SCSCF at UE.

3. by the method for the described definite private user identity of claim 1, it is characterized in that step is 3.:

S-CSCF extracts IMPI in the conversation procedure from the Route header field;

Wherein:

S-CSCF-service call conversation controller;

Route-SIP message header field is used for the routing forwarding of request message.