CN101997828B - Method, device and network for network re-registration of Internet protocol multimedia subsystem (IMS) - Google Patents

Abstract

The invention provides a network re-registration method, equipment and network of the Internet Protocol Multimedia Subsystem. The method uses the information of the S-CSCF of the registered UE stored in the registered user information database of the P-CSCF to directly forward the re-registration (Register) message sent by the UE in the IMS domain, thereby reducing the re-registration process. The signaling interaction reduces the load on the core network IMS equipment and improves the user's experience of delay during the re-registration process.

Description

Internet protocol multimedia subsystem network re-registration method, device and network

technical field

The present invention relates to the technical field of Internet Protocol Multimedia Subsystem (IMS, IP Multimedia Subsystem), in particular to an IMS network re-registration method, device and network.

Background technique

The IMS specified by the 3rd Generation Partnership Project (3GPP) is proposed to support multimedia sessions and other services based on the Session Initiation Protocol (SIP, Session Initiation Protocol) in the 3G core network. Communication and Internet technologies are organically combined to provide users with a next-generation communication network with carrier-class quality of service (QoS) guarantees and comprehensive services. Its main feature is that it adopts the SIP protocol and is independent of access and bearer technologies.

3GPP stipulates that a user equipment (UE, User Equipment) needs to complete a registration process to use services provided by an IMS network. The IMS registration process and signaling interaction stipulated in the existing 3GPP specifications are shown in Figure 1, specifically including:

In step 101, the UE sends a SIP registration request (Register) message for requesting IMS registration or re-registration, and starts the registration process. The Register message contains the domain name of the UE's home network, the UE's private user identity (IMPI, IP Multimedia Private Identity) and public user identity (IMPU, IPMultimedia Public Identity) and session description information, etc., and arrives at the proxy call session of the network where the UE resides Control function entity (P-CSCF, Proxy-Call Session Control Function). Here, it is assumed that the network where the UE resides is the home network of the UE.

Step 102, after receiving the Register message, the P-CSCF determines the interrogating-call session control function entity (I-CSCF, Interrogating-Call Session Control Function) in the home domain, and then forwards the Register message to the I-CSCF.

Step 103, after the I-CSCF receives the Register message, it will generate a user authentication request (UAR, User Authorization Request) message according to the IMPU and IMPI of the UE carried in the Register message and send it to the Home Subscriber Server (HSS, Home Subscriber Server).

Step 104, the HSS determines the Serving-Call Session Control Function entity (S-CSCF, Serving-Call Session Control Function) serving the UE according to the UAR message, and sends the S-CSCF entity through a User Authorization Answer (UAA, User Authorization Answer) message. - The address of the CSCF is notified to the I-CSCF.

Step 105, the I-CSCF forwards the Register message to the S-CSCF according to the address of the S-CSCF. The S-CSCF authenticates the UE according to the Register message: if the authentication is successful, go to step 116; if the authentication fails, go to step 106. Usually, the first Register message sent by the UE does not include complete authentication (Authorization) information, thus resulting in authentication failure and proceeding to step 106 .

Steps 106-108, the S-CSCF obtains the authentication vector by exchanging Multimedia Auth Request/Multimedia Auth Answer (MAR/MAA, Multimedia Auth Request/Multimedia Auth Answer) messages with the HSS, and returns to the I-CSCF containing the authentication vector. The authentication challenge message (401 Unauthorized message) of the weight vector.

In steps 109-110, the I-CSCF forwards the received authentication challenge message to the P-CSCF, and the P-CSCF forwards the authentication challenge message to the UE;

Step 111, the UE generates an authentication challenge response according to the authentication vector in the authentication challenge message, and sends another Register message (second Register message) for requesting IMS registration or re-registration to the P-CSCF, The other Register message carries an Authentication (Authorization) header field, which includes authentication challenge response information.

Steps 112-115, according to similar steps 102-105 above, the other Register message is forwarded to the S-CSCF. The S-CSCF continues to authenticate the UE according to the other Register message. The second Register message contains complete authentication information. Normally, the authentication will be successful, and then go to step 116 .

In steps 116-118, the S-CSCF updates the registration information of the UE, and returns to the I-CSCF a SIP 200 OK response message indicating that the UE has successfully registered.

In steps 119-120, the I-CSCF forwards the received response message to the P-CSCF, and after receiving the response message, the P-CSCF updates the registration information of the UE stored by itself, and forwards the response message to the UE; UE After receiving the response message, the registration process is successfully completed.

In an IMS network, when the UE registration period expires, or the IP address of the UE changes due to movement or network reattachment, it is necessary to refresh the registration status of the UE through the IMS network re-registration process to achieve continuity of service provision. The IMS network re-registration process stipulated in the existing 3GPP specification is completely consistent with the IMS network initial registration shown in FIG. 1 .

It can be seen that the signaling process in the registration process shown in Figure 1 is very complicated. Therefore, the IMS network re-registration in the prior art has disadvantages such as time-consuming re-registration, heavy load on IMS equipment in the core network, and poor user experience.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method, device and network for IMS network re-registration, simplify the signaling flow in the process of IMS network re-registration, shorten the time required for re-registration, and reduce the load of core network IMS equipment.

In order to solve the problems of the technologies described above, the present invention provides the following solutions:

A method for Internet Protocol Multimedia Subsystem IMS network re-registration, comprising:

Step A, the proxy call session control function entity P-CSCF receives the registration request Register message for requesting IMS registration or re-registration sent by the user equipment UE in the IMS domain;

Step B, the P-CSCF judges whether the user identity of the UE exists in the locally stored registered user information: if so, proceed to step C;

Step C, the P-CSCF determines the serving call session control function entity S-CSCF corresponding to the UE according to the locally stored registered user information, and directly forwards the Register message to the S-CSCF; After receiving the Register message, the S-CSCF authenticates the UE according to the Register message: if the authentication is successful, proceed to step D;

Step D, the S-CSCF updates the registration information of the UE, and returns to the P-CSCF a response message indicating that the UE registration is successful; after receiving the response message, the P-CSCF updates The registration information of the UE saved by itself, and the response message is forwarded to the UE.

Preferably, in the above method, in step C, if the S-CSCF fails to authenticate the UE, proceed to step E;

Step E, the S-CSCF obtains an authentication vector by interacting with the home subscriber server HSS for a multimedia authentication request and a multimedia authentication response, and returns an authentication challenge message containing the authentication vector to the P-CSCF ; The P-CSCF forwards the authentication challenge message to the UE; the UE generates an authentication challenge response according to the authentication vector in the authentication challenge message, and carries the authentication challenge response It is sent to the P-CSCF in another Register message for requesting IMS registration or re-registration.

Preferably, in the above method, in the step B, if it is judged that the user identifier of the UE does not exist in the locally stored registered user information, then enter step F;

Step F, the P-CSCF forwards the Register message to the I-CSCF inquiring call session control function entity according to the IMS registration process stipulated in the 3GPP specification.

Preferably, in the above method, in the step A, the P-CSCF further judges whether the connection between itself and the UE is a trusted connection according to a predetermined security policy: if yes, enter step B; otherwise, follow The IMS registration process stipulated by 3GPP forwards the Register message to the I-CSCF.

The present invention also provides a method for implementing Internet protocol multimedia subsystem IMS network re-registration on the proxy call session control function entity P-CSCF, including:

Step 1, the proxy call session control function entity P-CSCF receives the registration request Register message sent by the UE in the IMS domain for requesting IMS registration or re-registration;

Step 2, the P-CSCF judges whether the user identity of the UE exists in the locally stored registered user information: if so, proceed to step 3;

Step 3: The P-CSCF determines the information of the serving call session control function entity S-CSCF corresponding to the UE according to the locally stored registered user information, and directly forwards the Register message to the S-CSCF.

Preferably, in the above method, in the step 2, if it is judged that the user identifier of the UE does not exist in the locally stored registered user information, go to step 4;

Step 4: The P-CSCF forwards the Register message to the Inquiring Call Session Control Function entity I-CSCF according to the IMS registration procedure stipulated by 3GPP.

Preferably, in the above method, in step 1, the P-CSCF further judges whether the connection between itself and the UE is a trusted connection according to a predetermined security policy: if yes, enter step 2; otherwise, follow The IMS registration process stipulated by 3GPP forwards the Register message to the I-CSCF.

Preferably, in the above method, after the step 3, the method further includes:

If the P-CSCF receives the response message returned by the S-CSCF after successfully authenticating the UE, update the registration information of the UE stored by itself, and forward the response message to the UE ;

If the P-CSCF receives the authentication challenge message including the authentication vector returned by the S-CSCF after the UE fails to authenticate, it forwards the authentication challenge message to the UE.

The present invention also provides a proxy call session control function entity P-CSCF in the Internet Protocol Multimedia Subsystem IMS network, the P-CSCF includes a receiving unit, a judging unit and a first forwarding unit; wherein,

The receiving unit is configured to trigger the judging unit after receiving a Registration Request Register message for requesting IMS registration or re-registration sent by the UE in the IMS domain;

The judging unit is configured to judge whether the user identifier of the UE exists in the locally stored registered user information: if so, trigger the first forwarding unit;

The first forwarding unit is configured to determine the information of the S-CSCF corresponding to the UE according to the locally stored registered user information, and directly forward the Register message to the S-CSCF.

Preferably, the above P-CSCF further includes a second forwarding unit;

The judging unit is further configured to trigger the second forwarding unit when it is judged that the user identifier of the UE does not exist in the locally stored registered user information;

The second forwarding unit is configured to forward the Register message to the inquiry call session control function entity I-CSCF according to the IMS registration procedure stipulated by 3GPP.

Preferably, in the above P-CSCF, the receiving unit is further configured to judge whether the connection between the P-CSCF and the UE is a trusted connection according to a predetermined security policy after receiving the Register message : if yes, trigger the judging unit; otherwise, trigger the second forwarding unit.

Preferably, the above P-CSCF also includes:

The registration response unit is configured to, after receiving the response message returned by the S-CSCF after successfully authenticating the UE, update the registration information of the UE saved by itself, and forward the response message to the UE; and forwarding the authentication challenge message to the UE after receiving the authentication challenge message including the authentication vector returned by the S-CSCF after the UE fails to authenticate.

The present invention also provides a service call session control function entity S-CSCF in the Internet Protocol Multimedia Subsystem IMS network, the S-CSCF includes a receiving unit and a registration processing unit; wherein,

The receiving unit is configured to receive a registration request Register message forwarded by a proxy call session control function entity P-CSCF, and the Register message is sent to the P-CSCF by a UE in the IMS domain to which the P-CSCF belongs to request IMS registration or re-registration message, and this S-CSCF is the S-CSCF corresponding to the UE determined by the P-CSCF according to the registered user information saved by itself;

The registration processing unit is configured to authenticate the UE according to the Register message, and after the authentication is successful, update the registration information of the UE, and return to the P-CSCF to indicate that the UE Response message of successful registration.

Preferably, in the above-mentioned S-CSCF, the registration processing unit is further configured to interact with the Home Subscriber Server (HSS) by performing a multimedia authentication request and a multimedia authentication response after the authentication of the UE fails according to the Register message , acquire an authentication vector, and return an authentication challenge message including the authentication vector to the P-CSCF.

The present invention also provides an Internet Protocol Multimedia Subsystem IMS network, comprising:

The proxy call session control function entity P-CSCF is used to receive the registration request Register message for requesting IMS registration or re-registration sent by the UE in the IMS domain, and determine whether the user identity of the UE exists in the locally stored registered In user information: if yes, determine the S-CSCF corresponding to the UE according to the registered user information saved locally, and directly forward the Register message to the S-CSCF; and receive the return from the S-CSCF A response message indicating that the UE is registered successfully, updating the registration information of the UE saved by itself, and forwarding the response message to the UE;

The S-CSCF is configured to authenticate the UE according to the Register message after receiving the Register message forwarded by the P-CSCF: if the authentication is successful, update the registration information of the UE , and return to the P-CSCF a response message indicating that the UE has successfully registered.

Preferably, the above-mentioned IMS network further includes a Home Subscriber Server HSS;

The S-CSCF is further configured to acquire an authentication vector by interacting with the HSS in a multimedia authentication request and a multimedia authentication response after the UE fails to authenticate according to the Register message, and send the authentication vector to the The P-CSCF returns an authentication challenge message containing the authentication vector;

The P-CSCF is further configured to forward the received authentication challenge message to the UE.

Preferably, the above-mentioned IMS network further includes a session control function entity I-CSCF;

The P-CSCF is further configured to forward the Register message to the inquiry call session control function entity I in accordance with the IMS registration procedure specified by 3GPP when the user identifier of the UE does not exist in the locally stored registered user information -CSCF.

Preferably, in the above-mentioned IMS network, the P-CSCF is further configured to further judge whether the connection between itself and the UE is a trusted connection according to a predetermined security policy after receiving the Register message: if , then perform the matching process; otherwise, forward the Register message to the I-CSCF according to the IMS registration procedure specified by 3GPP.

It can be seen from the above description that in the method, device and network for IMS network re-registration provided by the present invention, the P-CSCF directly searches for the corresponding The S-CSCF forwards, thereby saving part of the signaling interaction process, enabling the re-registration process to be completed quickly, improving the user's experience of delay during the re-registration process, and reducing the load on the core network IMS equipment. Moreover, the present invention further judges whether the connection between the UE and the P-CSCF is a trusted connection, and re-registers according to the simplified flow of the present invention only when the connection is trusted, thereby ensuring the security of the re-registration.

Description of drawings

FIG. 1 is a schematic flow diagram of IMS network registration specified in the 3GPP specification in the prior art;

FIG. 2 is a schematic flowchart of a method for re-registering with an IMS network according to an embodiment of the present invention;

3 is a schematic diagram of signaling interaction in the IMS network re-registration method according to the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a P-CSCF according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an S-CSCF according to an embodiment of the present invention.

Detailed ways

Aiming at the problems existing in IMS network re-registration in the prior art, the present invention proposes an optimized IMS network re-registration method, using the registered user information database of the P-CSCF to store the information of the S-CSCF of the registered UE , which simplifies the forwarding process of the re-registration (Register) message and the S-CSCF query process, thereby reducing the signaling interaction during the re-registration process, reducing the load on the core network IMS equipment, and improving the user's response to the re-registration process. Latency experience.

The method for IMS network re-registration provided by the present invention comprises the following steps:

Step A, the P-CSCF receives the Register message for requesting IMS registration or re-registration sent by the user equipment UE in the IMS domain;

Step B, the P-CSCF judges whether the user identity of the UE exists in the locally stored registered user information: if yes, proceed to step C; otherwise, proceed to step F;

Step C, the P-CSCF determines the S-CSCF corresponding to the UE according to the locally stored registered user information, and directly forwards the Register message to the S-CSCF; the S-CSCF receives the After the Register message, authenticate the UE according to the Register message: if the authentication is successful, proceed to step D; otherwise, proceed to step E;

Step D, the S-CSCF updates the registration information of the UE, and returns to the P-CSCF a response message indicating that the UE registration is successful; after receiving the response message, the P-CSCF updates The registration information of the UE saved by itself, and forward the response message to the UE;

Step E, the S-CSCF obtains an authentication vector by interacting with the home subscriber server HSS for a multimedia authentication request and a multimedia authentication response, and returns an authentication challenge message containing the authentication vector to the P-CSCF ; The P-CSCF forwards the authentication challenge message to the UE; the UE generates an authentication challenge response according to the authentication vector in the authentication challenge message, and carries the authentication challenge response sent to the P-CSCF in another Register message for requesting IMS registration or re-registration;

Step F, the P-CSCF forwards the Register message to the I-CSCF inquiring call session control function entity according to the IMS registration process stipulated in the 3GPP specification.

In the above step B, the user identifier is the IMPU and/or IMPI of the UE. The registered user information stores the user identifier of the registered UE and the S-CSCF corresponding to the UE.

The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

After the UE completes the initial registration according to the registration process shown in Figure 1, the P-CSCF will save an entry corresponding to the UE in the local registered user information database, which includes the UE's IMPI, IMPU and the UE's Information of the S-CSCF (that is, the S-CSCF serving the UE determined in step 104 above). Therefore, during the re-registration process, the P-CSCF can query the registered user information database to obtain the S-CSCF of the UE, thereby saving unnecessary signaling interaction process. As shown in Figure 2, the IMS network re-registration method described in this embodiment includes the following steps:

In step 201, the UE sends a Register message to the P-CSCF. The Register message includes information such as the domain name of the UE's home network, the UE's IMPI and IMPU, and session description information.

The Register message is a SIP request message, which can be used to request IMS registration, IMS re-registration and IMS deregistration. When requesting IMS deregistration, the value of the Expires field in the Register message is equal to 0; when requesting IMS registration or IMS re-registration, the value of the Expires field is not equal to 0. In this embodiment, it is assumed that the UE sends a Register message for requesting IMS registration or re-registration, that is, the value of the Expires field of the Register message is not equal to 0. Moreover, the UE and the P-CSCF belong to the same IMS domain, that is, for the P-CSCF, the UE is a non-roaming user.

Step 202: After receiving the Register message sent by the UE in the IMS domain, the P-CSCF parses out that the Expires field of the Register message is greater than 0, indicating that the Register message requests IMS registration or re-registration. At this time, the P-CSCF judges whether the UE Non-roaming user: if the UE is a non-roaming user, go to step 203; otherwise, go to step 209.

Here, to determine whether the UE is a non-roaming user, whether the UE home network domain name contained in the From header field in the Register message is the same as the domain name in the Request-Line can be used to determine whether the UE is a non-roaming user; Of course, it is also possible to compare whether the UE's home network domain name is consistent with the P-CSCF's home network domain name to determine whether the UE is a non-roaming user.

Step 203, when the UE is a user in the IMS domain to which the P-CSCF belongs (that is, a non-roaming user), the P-CSCF extracts the UE's IMPI and IMPU from the Register message, and performs a check with the locally stored registered user information database. Matching processing, judging whether there is an entry matching the IMPI and IMPU of the UE in the registered user information database: if so, it indicates that the Register message is a re-registration request, and now enters step 204; otherwise, enters step 209. Here, if the IMPI and IMPU contained in an entry are the same as the IMPI and IMPU of the UE, it is considered that the entry matches the IMPI and IMPU of the UE.

Step 204, when there is an entry matching the UE's IMPI and IMPU (for convenience of description, hereinafter referred to as the first entry), the P-CSCF according to the S-CSCF included in the first entry (for convenience of description, Hereinafter referred to as information of the first S-CSCF for short), the Register message is directly forwarded to the first S-CSCF.

Step 205, after receiving the Register message, the first S-CSCF performs authentication on the UE according to the Register message: if the authentication is successful, go to step 208; otherwise, go to step 206. If the Register message sent by the UE in step 201 does not include complete authentication (Authorization) information, authentication will fail at this time.

Step 206, the S-CSCF obtains the authentication vector by exchanging MAR/MAA messages with the HSS, and returns an authentication challenge message containing the authentication vector to the P-CSCF; after the P-CSCF receives the authentication challenge message, Forwarding the authentication challenge message to the UE.

Step 207, the UE generates an authentication challenge response according to the authentication vector in the authentication challenge message, and sends another Register message for requesting IMS registration or re-registration to the P-CSCF, and the other Register message carries The authentication (Authorization) header field contains the information of the authentication challenge response. After that, return to step 202, and the P-CSCF performs similar processing on the other Register message according to the above-mentioned flow.

Step 208, the first S-CSCF updates the registration information of the UE, and returns to the P-CSCF a response message (SIP 200 OK message) indicating that the UE registration is successful; the P-CSCF receives the After receiving the above response message, update the registration information of the UE saved by itself, and forward the response message to the UE, so as to notify the UE that the re-registration is successful.

Here, the updating the registration information of the UE specifically includes: the first S-CSCF requests to update the S-CSCF information of the UE by sending a Server Assignment Request (SAR, Server Assignment Request) message to the HSS; An S-CSCF returns a Server Assignment Answer (SAA, Server Assignment Answer) message, indicating that the information of the S-CSCF of the UE has been updated successfully, wherein the SAA message includes the configuration file (userdata) of the UE, and the first S-CSCF Based on this, the CSCF updates the registration information of the UE, such as updating the UE's IP address, Expire (timeout time) and other information.

Step 209, the P-CSCF forwards the Register message to the I-CSCF according to the IMS registration process specified in the 3GPP specification; thereafter, continue to register the UE according to the IMS registration process specified in the 3GPP specification, the specific process is shown in Figure 1 Steps 103-118 of , will not be repeated here.

In the above step 202, while judging whether the UE is a non-roaming user, the P-CSCF can further judge whether the connection between itself and the UE is a trusted connection. Only when the connection is a trusted connection and the UE If it is a non-roaming user, go to step 203; otherwise, go to step 209. The advantage of doing this is that the security of the IMS network can be improved, and attacks on the IMS network by malicious users can be avoided. Specifically, the P-CSCF can judge whether the connection is a trusted connection according to a predetermined security policy. For example, according to whether the address of the Contact header field in the Register message is a predetermined legal address, it is judged whether it is a trusted connection; another example, for the UE that has performed the authentication on the access side during the establishment of the IP access connection (such as A UE that accesses the IMS network through a 2G/3G packet switching (PS) domain, or a UE that accesses through a fixed hard terminal), the connection with the UE is considered to be a trusted connection.

According to the above-mentioned IMS network re-registration method in this embodiment, the message interaction process in the re-registration process can be simplified as shown in FIG. 3 . Compared with FIG. 1 , it can be seen that this embodiment can save a lot of signaling interaction processes, including the signaling forwarding of the I-CSCF and the process of querying the S-CSCF through the HSS.

It can be seen from the above that this embodiment is based on the relevant requirements of the 3GPP specification for IMS equipment: the P-CSCF locally stores the information of the IMPI and IMPU of each registered UE and the corresponding S-CSCF of the registered UE; and , for non-roaming users, P-CSCF and S-CSCF can directly perform signaling interaction in the same domain. In this embodiment, the registered user information database stored locally is queried by the P-CSCF to determine whether the received Register message is a re-registration request. If so, the S-CSCF is directly searched locally and forwarded directly, thereby making the re-registration process fast Finish. Since this embodiment simplifies the forwarding process of the Register message and the S-CSCF query process in the re-registration process, the signaling interaction in the re-registration process is reduced, and the load of the core network IMS equipment is reduced. And improve the user's experience of delay in the re-registration process.

Based on the above-mentioned IMS network re-registration method, this embodiment also provides a P-CSCF and an S-CSCF in the IMS network correspondingly.

As shown in Figure 4, the P-CSCF described in this embodiment includes a receiving unit, a judging unit, and a first forwarding unit; wherein,

The receiving unit is configured to trigger the judging unit after receiving a Registration Request Register message for requesting IMS registration or re-registration sent by the UE in the IMS domain;

The judging unit is configured to judge whether the user identifier of the UE exists in the locally stored registered user information: if so, trigger the first forwarding unit;

The first forwarding unit is configured to determine the information of the S-CSCF corresponding to the UE according to the locally stored registered user information, and directly forward the Register message to the S-CSCF.

Preferably, the P-CSCF shown in FIG. 4 may further include a second forwarding unit. The judging unit is further configured to trigger the second forwarding unit when judging that the user identifier of the UE does not exist in the locally stored registered user information. The second forwarding unit is configured to forward the Register message to the I-CSCF according to the IMS registration process specified by 3GPP.

Preferably, in the P-CSCF shown in FIG. 4, the receiving unit may also be configured to judge whether the connection between itself and the UE is possible according to a predetermined security policy after receiving the Register message. Communication connection: if yes, trigger the judging unit; otherwise, trigger the second forwarding unit.

Preferably, the P-CSCF shown in FIG. 4 may further include: a registration response unit, configured to update the P-CSCF saved by itself after receiving the response message returned by the S-CSCF after the UE is successfully authenticated. registration information of the UE, and forward the response message to the UE; and after receiving the authentication challenge message including the authentication vector returned by the S-CSCF after the authentication of the UE fails, send the The authentication challenge message is forwarded to the UE.

As shown in FIG. 5 , the S-CSCF provided in this embodiment includes a receiving unit and a registration processing unit.

Wherein, the receiving unit is configured to receive a registration request Register message forwarded by the P-CSCF, and the Register message is sent to the P-CSCF by a UE in the IMS domain to which the P-CSCF belongs to request for IMS registration or re-registration. A registration message, and the S-CSCF is the S-CSCF corresponding to the UE determined by the P-CSCF according to the registered user information stored by the P-CSCF;

The registration processing unit is configured to authenticate the UE according to the Register message, and after the authentication is successful, update the registration information of the UE, and return to the P-CSCF to indicate that the UE Response message of successful registration.

Preferably, the registration processing unit is further configured to obtain an authentication vector by interacting with a home subscriber server HSS for a multimedia authentication request and a multimedia authentication response after the UE fails to authenticate according to the Register message, And return an authentication challenge message including the authentication vector to the P-CSCF.

Finally, this embodiment also provides an IMS network, including:

The P-CSCF is used to receive the Registration Request Register message for requesting IMS registration or re-registration sent by the UE in the IMS domain and determine whether the user identifier of the UE exists in the locally stored registered user information: if yes, then Determine the S-CSCF corresponding to the UE according to the locally saved registered user information, and directly forward the Register message to the S-CSCF; and receive an indication returned by the S-CSCF indicating that the UE has registered successfully a response message, update the registration information of the UE saved by itself, and forward the response message to the UE;

The S-CSCF is configured to authenticate the UE according to the Register message after receiving the Register message forwarded by the P-CSCF: if the authentication is successful, update the registration information of the UE , and return to the P-CSCF a response message indicating that the UE has successfully registered;

Preferably, the IMS network provided by this embodiment further includes an HSS. The S-CSCF is further configured to acquire an authentication vector by interacting with the HSS in a multimedia authentication request and a multimedia authentication response after the UE fails to authenticate according to the Register message, and send the authentication vector to the The P-CSCF returns an authentication challenge message including the authentication vector; the P-CSCF is further configured to forward the received authentication challenge message to the UE.

Preferably, the IMS network provided in this embodiment further includes an I-CSCF. The P-CSCF is further configured to forward the Register message to the I-CSCF according to the IMS registration procedure stipulated by 3GPP when there is no user identifier of the UE in the locally stored registered user information.

Preferably, in the IMS network provided by this embodiment, the P-CSCF is further configured to further judge whether the connection between itself and the UE is possible according to a predetermined security policy after receiving the Register message. Communication connection: if yes, perform the matching process; otherwise, forward the Register message to the I-CSCF according to the IMS registration process specified by 3GPP.

In summary, the IMS network re-registration method, device, and network provided by the embodiments of the present invention can shorten the time for IMS network re-registration, reduce the signaling interaction between entities during the re-registration process, and reduce the burden on IMS devices. To improve the user's delay experience for re-registration.

The above is only the embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as Be the protection scope of the present invention.

Claims (17)

1. A method of internet protocol multimedia subsystem, IMS, network re-registration, comprising:

step A, a proxy call session control function entity P-CSCF receives a registration request Register message which is sent by user equipment UE of an IMS domain and used for requesting IMS registration or re-registration;

step B, the P-CSCF judges whether the user identification of the UE exists in the registered user information stored locally: if yes, entering the step C;

step C, the P-CSCF determines a service call session control function entity S-CSCF corresponding to the UE according to the locally stored registered user information, and directly forwards the Register message to the S-CSCF; and after receiving the Register message, the S-CSCF authenticates the UE according to the Register message: if the authentication is successful, entering the step D;

step D, the S-CSCF updates the registration information of the UE and returns a response message for indicating the successful registration of the UE to the P-CSCF; and after receiving the response message, the P-CSCF updates the registration information of the UE stored by the P-CSCF, and forwards the response message to the UE.

2. The method of claim 1, wherein in the step C, if the S-CSCF fails to authenticate the UE, step E is entered;

step E, the S-CSCF acquires an authentication vector by interacting a multimedia authentication request and a multimedia authentication response with a Home Subscriber Server (HSS), and returns an authentication challenge message containing the authentication vector to the P-CSCF; the P-CSCF forwards the authentication challenge message to the UE; and the UE generates an authentication challenge response according to the authentication vector in the authentication challenge message, carries the authentication challenge response in another Register message for requesting IMS registration or re-registration and sends the authentication challenge response to the P-CSCF.

3. The method of claim 1, wherein in step B, if it is determined that the UE user identity does not exist in the locally stored registered user information, step F is performed;

and F, the P-CSCF forwards the Register message to an inquiring call session control function entity (I-CSCF) according to an IMS registration process specified by a 3GPP specification.

4. A method according to any one of claims 1 to 3, wherein in step a, the P-CSCF further determines whether the connection between itself and the UE is a trusted connection according to a predetermined security policy: if yes, entering the step B; otherwise, according to IMS Register flow specified by 3GPP, the Register message is forwarded to the query call session control function entity I-CSCF.

5. A method for performing an internet protocol multimedia subsystem, IMS, network re-registration at a proxy call session control function, P-CSCF, comprising:

step 1, a proxy call session control function entity P-CSCF receives a registration request Register message which is sent by UE of an IMS domain and used for requesting IMS registration or re-registration;

step 2, the P-CSCF determines whether the user identifier of the UE exists in the locally stored registered user information: if yes, entering step 3;

and 3, the P-CSCF determines the information of the service call session control function entity S-CSCF corresponding to the UE according to the locally stored registered user information, and directly forwards the Register message to the S-CSCF.

6. The method of claim 5, wherein in step 2, if it is determined that the user identity of the UE does not exist in the locally stored registered user information, step 4 is entered;

and 4, the P-CSCF forwards the Register message to an I-CSCF (Call Session control function) of an inquiring call session control function entity according to an IMS (IP multimedia subsystem) registration process specified by 3 GPP.

7. The method according to claim 5 or 6, wherein in step 1, the P-CSCF further determines whether the connection between itself and the UE is a trusted connection according to a predetermined security policy: if yes, entering step 2; otherwise, according to IMS Register flow specified by 3GPP, the Register message is forwarded to the query call session control function entity I-CSCF.

8. The method of claim 5 or 6,

after the step 3, the method further comprises:

if the P-CSCF receives a response message returned by the S-CSCF after the S-CSCF successfully authenticates the UE, updating the registration information of the UE stored by the P-CSCF, and forwarding the response message to the UE;

and if the P-CSCF receives an authentication challenge message which contains an authentication vector and is returned by the S-CSCF after the S-CSCF fails to authenticate the UE, forwarding the authentication challenge message to the UE.

9. A proxy call session control function entity P-CSCF in an Internet protocol multimedia subsystem IMS network is characterized in that the P-CSCF comprises a receiving unit, a judging unit and a first forwarding unit; wherein,

the receiving unit is used for triggering the judging unit after receiving a registration request Register message which is sent by the UE of the IMS domain and used for requesting IMS registration or re-registration;

the judging unit is configured to judge whether the user identifier of the UE exists in locally stored registered user information: if yes, triggering the first forwarding unit;

the first forwarding unit is configured to determine information of an S-CSCF corresponding to the UE according to locally stored registered user information, and directly forward the Register message to the S-CSCF.

10. The P-CSCF of claim 9 further comprising a second forwarding unit;

the judging unit is further configured to trigger the second forwarding unit when it is judged that the user identifier of the UE does not exist in the locally stored registered user information;

and the second forwarding unit is configured to forward the Register message to an inquiring call session control function entity I-CSCF according to an IMS registration procedure specified by 3 GPP.

11. The P-CSCF of claim 9,

the receiving unit is further configured to, after receiving the Register message, determine whether the connection between the P-CSCF and the UE is a trusted connection according to a predetermined security policy: if yes, triggering the judging unit; otherwise, triggering the second forwarding unit.

12. The P-CSCF of claim 9 or 10, further comprising:

a registration response unit, configured to update registration information of the UE stored in the registration response unit after receiving a response message returned by the S-CSCF after the S-CSCF successfully authenticates the UE, and forward the response message to the UE; and after receiving an authentication challenge message containing an authentication vector returned by the S-CSCF after the authentication of the UE fails, forwarding the authentication challenge message to the UE.

13. A serving call session control function, S-CSCF, in an internet protocol multimedia subsystem, IMS, network for use in a method of re-registration of an internet protocol multimedia subsystem, IMS, network as claimed in claim 1, wherein the S-CSCF comprises a receiving unit and a registration processing unit; wherein,

the receiving unit is used for directly receiving a Register request Register message forwarded by a proxy call session control function entity (P-CSCF), wherein the Register message is a message which is sent to the P-CSCF by UE in an IMS domain to which the P-CSCF belongs and is used for requesting IMS registration or re-registration, and the S-CSCF is the S-CSCF corresponding to the UE determined by the P-CSCF according to the registered user information stored by the P-CSCF;

and the registration processing unit is used for authenticating the UE according to the Register message, updating the registration information of the UE after the authentication is successful, and directly returning a response message for indicating the successful registration of the UE to the P-CSCF.

14. The S-CSCF of claim 13,

and the registration processing unit is also used for acquiring an authentication vector by interacting a multimedia authentication request and a multimedia authentication response with a Home Subscriber Server (HSS) after the UE is failed to authenticate according to the Register message, and returning an authentication challenge message containing the authentication vector to the P-CSCF.

15. An internet protocol multimedia subsystem, IMS, network, comprising:

a proxy call session control function entity P-CSCF, which is used for receiving a registration request Register message sent by UE in the IMS domain and used for requesting IMS registration or re-registration, and judging whether the user identification of the UE exists in the registered user information stored locally: if so, determining an S-CSCF corresponding to the UE according to locally stored registered user information, and directly forwarding the Register message to the S-CSCF; receiving a response message which is returned by the S-CSCF and indicates that the UE is successfully registered, updating the registration information of the UE stored by the S-CSCF, and forwarding the response message to the UE;

and the S-CSCF is used for authenticating the UE according to the Register message after receiving the Register message forwarded by the P-CSCF: and if the authentication is successful, updating the registration information of the UE and returning a response message for indicating the successful registration of the UE to the P-CSCF.

16. The IMS network of claim 15, further comprising a home subscriber server, HSS;

the S-CSCF is further configured to obtain an authentication vector by interacting a multimedia authentication request and a multimedia authentication response with the HSS after the authentication of the UE according to the Register message fails, and return an authentication challenge message containing the authentication vector to the P-CSCF;

the P-CSCF is further configured to forward the received authentication challenge message to the UE.

17. The IMS network of claim 15, further comprising a query call session control function entity, I-CSCF;

and the P-CSCF is further configured to forward the Register message to an inquiring call session control function entity I-CSCF according to an IMS registration procedure specified by 3GPP when the user identity of the UE does not exist in the locally stored registered user information.