WO2006060965A1

WO2006060965A1 - A method and system for determining the time when the cancellation flow is initiated

Info

Publication number: WO2006060965A1
Application number: PCT/CN2005/002142
Authority: WO
Inventors: Yajuan Wu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-12-10
Filing date: 2005-12-09
Publication date: 2006-06-15

Abstract

A method and system for determining the time when the cancellation flow is initiated are characterized by that the time when HSS notifies the old S-CSCF which provides the service to the user to initiate the cancellation flow after I-CSCF re-selects S-CSCF is present definitely, which ensures that the HSS can notify the old S-CSCF to initiate the cancellation flow at first and then use the name of the new S-CSCF to cover the locally stored name of the old S-CSCF which provides the service to the user when I-CSCF initiates the re-selection of S-CSCF. The above solution ensures the service flow can be performed correctly, improves the satisfaction of the user, improves the efficiency and reliability of the operator’s network and is well compatible with the prior art.

Description

Method and system for determining the timing of initiating a logout process

The present invention relates to the field of mobile communication technologies, and in particular to a method and system for determining the timing of initiating a logout process. Background of the invention

With the development of broadband networks, mobile communications will not only be limited to traditional voice communications, but also through data services such as presence, short message, web browsing, location information, push service (PUSH) and file sharing. The combination of mobile communication enables a variety of media types, such as audio, video, pictures and text, to meet the diverse needs of users.

Organizations such as the 3rd Generation Mobile Communications Standardization Partnership Project (3GPP) and the 3rd Generation Mobile Communications Standardization Partnership Project 2 (3GPP2) have launched IP-based Multimedia Subsystem (IMS) architectures, which are designed to use one in mobile networks. A standardized open structure to implement a wide variety of multimedia applications to provide users with more choices and richer feelings.

The IMS architecture is superimposed on the packet domain network and consists of functional entities such as a Call State Control Function (CSCF) entity, a Media Gateway Control Function (MGCF) entity, a Media Resource Function (MRF) entity, and a User Home Network Server (HSS). The MGCF is used to implement interworking between the IMS network and other networks; the MRP is used to provide media resources, such as audio and video, codec and multimedia conference bridges; the HSS stores all information related to the subscription, and is used to support the call of each network entity. And the processing of the session specifically includes: the user's identification, number, and addressing information; the user's security information; the user's location information and the user's profile information, etc., a home network may have one or more HSSs, The specific number depends on the number of mobile subscription users, the capacity of network devices, and the specific networking conditions. The CSCF can be further divided into three logical entities: a service CSCF (S-CSCF), a proxy CSCF (P-CSCF), and a query CSCF (I-CSCF). The three logical entities may be different physical devices or may be the same physical entity. Different functional modules in the device. The S-CSCF is a service control center of the IMS, which is used to perform session control, maintain session state, manage user information, and generate charging information. The P-CSCF is an access point for the terminal user to access the IMS, and is used to complete user registration. Quality of Service (QoS) control and security management; The I-CSCF is responsible for interworking between IMS domains, managing the allocation of S-CSCFs, hiding network topology and configuration information, and generating billing data.

Since the IMS network structure is independent of the underlying bearer network, the 3GPP defined IMS network can also be applied to other packet networks other than the 3GPP defined packet domain network, so the IMS is not limited to the 3GPP related network and In application, other types of access networks and bearer network services and applications can also be implemented by using the IMS architecture.

Each user who has signed the IMS service is assigned one or more private user IDs by the home network operator for use in the registration, authorization, management, and accounting process, and the identifier uses the network access identifier (NAI). , Network Access Identifier ) format; each IMS user has one or more public user IDs that are used to identify themselves and find each other when communicating with other users. Private user IDs are generally not publicly available, and public user IDs are publicly available and are used during conversations using various types of services.

According to whether the user initiates the registration process, the registration status of the user can be divided into a registration status, a logout status and an unregistered status. The registration status refers to a public user identification completed registration (REGISTER) process, and the S-CSCF to which the service is assigned, The logout status refers to a public user ID that has not initiated the REGISTER process at all. The unregistered state refers to a public user ID that does not initiate the REGISTER process, but it is the S-CSCF to which the called service is assigned or has an S-CSCF. The description information of the user corresponding to the public user identifier is saved. According to the existing IMS specification, after the HSS receives the query information from the I-CSCF, if the query information explicitly indicates that the S-CSCF needs to be reselected, the HSS considers that the I-CSCF needs to reselect the S-CSCF, and The S-CSCF capability information that satisfies the user's most stringent service subscription requirements is returned to the I-CSCF for the I-CSCF to reselect the S-CSCF.

If the query information does not explicitly indicate whether the S-CSCF needs to be reselected, the HSS determines whether the I-CSCF needs to reselect the S-CSCF according to the user subscription information saved by itself.

If the HSS considers that the S-CSCF currently serving the user can meet the needs of the user, only the response information including the name of an S-CSCF is returned, and the I-CSCF continues to interact with the S-CSCF; If the S-CSCF has not been assigned to any of the users in the HSS, only the S-CSCF capability information that meets the most stringent service subscription requirements of the user is returned, and the I-CSCF selects an S-CSCF according to the capability information, and Interaction, there is no problem that the I-CSCF reselects a different S-CSCF; if the HSS believes that the S-CSCF currently serving the user may not be able to meet the needs of the user, it also returns the name of an S-CSCF. And the S-CSCF capability that satisfies the user's most stringent service contracting requirements, the I-CSCF decides whether to re-select the S-CSCF, that is, there may be a problem that the I-CSCF reselects the S-CSCF at this time.

Once the I-CSCF reselects the S-CSCF, after the new S-CSCF receives the REGISTER or INVITE forwarded by the I-CSCF, it requests the user profile from the HSS according to the normal IMS session processing process, and according to the existing The process continues with subsequent processing.

In the specification of IMS, a premise is also determined that only one S-CSCF can serve a user at a time. This means that after the S-CSCF reselection, all services of the user are processed by the new S-CSCF. To this end, the HSS is required to notify the old S-CSCF to initiate the logout process, which is performed by the old S-CSCF. Log out the operation of the business related to the user, update the local information, and decide whether to notify the user according to the reason for the cancellation, to avoid using The user continues to apply the original S-CSCF to ensure that only one S-CSCF currently provides services for the user.

However, in the existing IMS specification, it is not explicitly indicated when the HSS initiates the logout process after the I-CSCF reselects the S-CSCF. Therefore, the following problems exist in the existing implementation process:

After the I-CSCF reselects the S-CSCF, after receiving the REGISTER or INVITE forwarded by the I-CSCF, the new S-CSCF requests the user profile from the HSS according to the normal IMS session processing process, and the HSS will immediately Overwrite the locally saved name of the old S-CSCF that served the user with the name of the new S-CSCF and continue the subsequent operations in accordance with the normal flow. In this way, since the HSS has no association information between the user and the old S-CSCF, the HSS cannot notify the old S-CSCF to initiate the logout at all, and the HSS and the old S-CSCF will continue to process a large amount of information. Redundant information. More seriously, users are likely to continue to use the old S-CSCF, resulting in business errors and reduced user satisfaction with the system. Summary of the invention

In view of the above, the object of the present invention is to provide two methods for determining the timing of initiating the logout process, which is used to prevent the HSS from notifying the old S-CSCF to initiate the logout process, overwriting the locally saved former with the name of the new S-CSCF. The user provides the name of the service's old S-CSCF and resolves the resulting issue.

At the same time, the present invention also provides two systems for determining the timing of initiating the logout process to implement the above method.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for determining an opportunity to initiate a logout process, the method comprising the steps of: determining, at a user home network server, that a call state control function entity needs to be queried I-CSCF reselects the service call state control function entity that provides service to a user

After the S-CSCF, an identifier indicating that the S-CSCF may be modified is set for the locally saved S-CSCF that has served the user;

The HSS checks whether the S-CSCF has been updated, and whether the locally saved S-CSCF serving the user has been identified as likely to be modified if the S-CSCF has been updated and the locally saved S-CSCF serving the user It has been identified that it may be modified, and the HSS clears the set identifier to notify the locally saved S-CSCF serving the user to initiate the logout process.

Preferably, the HSS checks whether the S-CSCF has been updated by:

When the HSS receives a message requesting user description information from the S-CSCF, it is determined whether the name of the S-CSCF requesting the user description information is the same as the name of the locally saved S-CSCF serving the user, and if the names are different, then S -CSCF has been updated, if the same, the S-CSCF is not updated.

Preferably, the method further comprises: if the HSS determines that the name of the S-CSCF requesting the user description information is the same as the name of the locally saved S-CSCF serving the user, and the locally saved S- serving the user The CSCF has been identified as likely to be modified, then the set identifier is cleared and the subsequent processing continues in accordance with the existing normal flow.

Preferably, the method further comprises: if the HSS determines that the name of the S-CSCF requesting the user description information is different from the locally saved name of the S-CSCF serving the user, and the locally saved S- serving the user If the CSCF is not identified as likely to be modified, the HSS reports an error and then continues the subsequent processing in accordance with the existing error procedure.

Preferably, the method further comprises: if the HSS determines that the name of the S-CSCF requesting the user description information is the same as the name of the locally saved S-CSCF serving the user, and the locally saved S- serving the user If the CSCF is not identified as likely to be modified, subsequent processing continues in accordance with the existing normal process.

Preferably, the HSS first determines the name of the S-CSCF requesting the user description information. Whether the name of the locally saved S-CSCF serving the user is the same, and determining whether the locally saved S-CSCF serving the user has been identified as being likely to be modified, or

The HSS first determines whether the locally saved S-CSCF serving the user has been identified as being likely to be changed, and then determines the name of the S-CSCF requesting the user description information and the locally saved S-CSCF serving the user. Is the name the same?

Preferably, the method for the HSS to check whether the S-CSCF has been updated is: the HSS checks whether a notification of the updated S-CSCF from the I-CSCF is received, and if the notification is received, the S-CSCF is updated, otherwise S- CSCF is not updated.

Preferably, the HSS determines that the I-CSCF needs to reselect the S-CSCF according to the information indicating the reselection of the S-CSCF in the query information from the I-CSCF, or the HSS determines the I according to the change of the user subscription information saved by the HSS. -CSCF needs to reselect S-CSCF.

Preferably, the information indicating that the locally saved S-CSCF serving the user initiates the logout process includes a logout reason;

The method further includes: locally storing the S-CSCF serving the user, performing the service control related to the logout according to the reason for the logout in the logout notification, updating the local information, and then returning the logout response to the HSS;

After receiving the logout response, the HSS overwrites the locally saved S-CSCF name for the user with the name of the S-CSCF requesting the user description information, and then continues the subsequent processing according to the existing normal procedure.

Preferably, the reason for the cancellation is that a new server NEW_SERVER_ASSSIGNED is assigned, or the server is changed to SERVER_CHANGE.

Preferably, after receiving the user registration status query message (Cx-Query or Cx-Select-Pull) from the I-CSCF, or the user location query message (Cx-Location-Quer), the HSS performs a judgment to determine whether an I is needed. -CSCF reselects the operation of the S-CSCF. Preferably, the method further comprises: after the HSS has set the identifier that may be modified for the S-CSCF, and clears the identifier that may be modified, if an I-CSCF receives the location When the user who provides the service by the S-CSCF acts as the called call request, the HSS temporarily suspends the query request when an I-CSCF that processes the call request queries the HSS for the S-CSCF that is currently the user's monthly service. Until the S-CSCF currently serving the user is determined, the S-CSCF currently serving the user is directly returned.

Preferably, the certain I-CSCF that processes the call request is the same I-CSCF or a different I-CSCF than the I-CSCF that needs to perform the reselection of the S-CSCF operation.

Preferably, after the HSS receives the CX-Put or CX-Pull message from the S-CSCF, it determines that the S-CSCF is the S-CSCF currently serving the user.

Preferably, the method further includes: presetting a timer for the called to be suspended, starting the timer after the query request is suspended, and if the preset timing time is reached, the query request is still hanging From the state, the query request is forcibly broken.

Preferably, the identifier indicating that the S-CSCF may be modified is a flag bit.

A method for determining an opportunity to initiate a logout process, the method comprising the steps of: after the HSS determines that the I-CSCF needs to reselect the S-CSCF, notifying the locally saved S-CSCF serving the user to initiate a logout procedure.

After receiving the logout response, the HSS clears the locally saved S-CSCF name, and then returns the S-CSCF capability information that meets the strictest service subscription requirement of the user to the I-CSCF, and then processes the S-CSCF name locally. Continue to follow up. Preferably, the reason for the logout is that a new server is allocated.

NEW—SERVER—ASSIGNED, or set to server to change SERVER—CHANGE.

Preferably, after receiving the user registration status query message (Cx-Query or Cx-Select-Pull) from the I-CSCF, or the user location query message (Cx-Location-Query), the HSS performs a judgment to determine whether an I is needed. -CSCF reselects the operation of the S-CSCF.

A system for determining an opportunity to initiate a logout process, comprising at least a user home network server HSS, an inquiry call state control function entity I-CSCF and a service call state control function entity S-CSCF, and the HSS is included for execution The logout module of the logout process, characterized in that the system further comprises an identifier setting module for setting an identifier that may be modified for the S-CSCF,

After the HSS determines that the call state control function entity I-CSCF needs to reselect the service call state control function entity S-CSCF that provides service for a certain user, the identifier setting module is triggered, and the identifier setting module is locally saved. The S-CSCF setting of the user-provided service indicates an identifier that the S-CSCF may be modified;

The HSS checks that the S-CSCF has been updated, and the locally saved S-CSCF serving the user has been identified as likely to be modified, and the HSS triggers the identifier setting module again, and the identifier setting module clears the set identifier. The logout module in the HSS is notified, and the logout module initiates a logout process to the locally saved S-CSCF serving the user.

Preferably, if the HSS detects that the S-CSCF is not updated, and the locally saved S-CSCF serving the user has been identified as likely to be modified, the HSS triggers the identity setting module again, and the identity setting module is Clear the set ID. Preferably, if the HSS checks that the S-CSCF has been updated, and the locally saved S-CSCF serving the user is not identified as likely to be modified, the HSS triggers an existing error reporting module in the The error module performs the processing flow of the error.

A system for determining an opportunity to initiate a logout process, the system including at least a user home network server HSS, an inquiry call state control function entity I-CSCF, and a service call state control function entity S-CSCF, and the HSS includes The logout module that performs the logout process,

After the HSS determines that the I-CSCF needs to reselect the S-CSCF, it notifies the logout module that the logout module initiates a logout process for the locally saved S-CSCF serving the user.

Applying the present invention, after the HSS determines that the I-CSCF needs to reselect the S-CSCF, it sets an identifier indicating that the S-CSCF may be modified for the locally saved S-CSCF that has served the user; HSS checks S- Whether the CSCF has been updated, and whether the locally saved S-CSCF serving the user has been identified as likely to be modified, if the S-CSCF has been updated, and the locally saved S-CSCF serving the user has been identified as The HSS may be modified, and the HSS clears the set identifier, and notifies the locally saved S-CSCF that serves the user to initiate the logout process; or, after the HSS determines that the I-CSCF needs to reselect the S-CSCF, directly notify the local The saved S-CSCF for the user service initiates the logout process, and then completes the subsequent operations according to the process of not saving the S-CSCF name.

The present invention clearly shows that when the I-CSCF reselects the S-CSCF, the HSS notifies the old S-CSCF that has served the user to initiate the logout process, ensuring that the I-CSCF initiates the S-CSCF reselection. At the same time, the HSS can first notify the old S-CSCF to initiate the logout process, and then overwrite the locally saved name of the old S-CSCF that served the user with the name of the new S-CSCF, thereby ensuring the correct execution of the service. The process improves user satisfaction, improves the efficiency and reliability of the carrier network, and is compatible with the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a flow chart showing the application of the first embodiment of the present invention;

2 is a flow chart showing the application of the second embodiment of the present invention;

FIG. 3 is a flow chart showing the application of the third embodiment of the present invention. Mode for carrying out the invention

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a flow chart showing the application of the first embodiment of the present invention. In this embodiment, the user performs a registration operation, and records the old S-CSCF that originally provided the service for the user as S-CSCFo, and the new S-CSCF that is reselected by the I-CSCF as S-CSCFn.

Step 101 to step 102, the user initiates registration, and the registration request (REGISTER) is forwarded to the I-CSCF by the user agent device (UA, user agent) and the P-CSCF.

Step 103: The 1-CSCF sends a UAR (User-Authorization-Request) message to the HSS. Specifically, the message on the Cx interface between the I-CSCF and the HSS is a Cx-Query or a Cx-Select-Pull message.

Step 104: The HSS returns a UAA (User-Authorization-Answer) message to the I-CSCF. Specifically, the message on the Cx interface between the I-CSCF and the HSS is a Cx-Query Resp or a Cx-Select-Pull Resp message.

In this embodiment, if the HSS determines that the I-CSCF needs to reselect the S-CSCF according to the change of the user subscription information saved by itself, the HSS includes the locally saved in the Cx-Query Resp or Cx-Select-Pull Resp message. The name of the S-CSCF serving the user and the S-CSCF capability information satisfying the most stringent service subscription requirements of the user. The HSS sets the S-CSCF that is returned to the I-CSCF, that is, the S-CSCFo indicates that the S-CSCF may be Modified logo.

If the query information received by the HSS clearly indicates that it needs to be reselected In the S-CSCF, the HSS includes the S-CSCF capability information that meets the most stringent service subscription requirements of the user in the Cx-Query Resp or Cx-Select-Pull Resp message, and then the HSS is a locally saved S-CSCF that has served the user. Set an identifier indicating that the S-CSCF may be modified.

The foregoing identifier may be a flag or other representation, as long as the meaning of the S-CSCF may be modified, and the specific implementation manner is not limited.

Step 105: The I-CSCF determines whether the name of the S-CSCF returned by the HSS can meet the current needs of the user. If yes, the I-CSCF continues to interact with the S-CSCF returned by the HSS. In this embodiment, assume I - The CSCF determines that the name of the S-CSCF returned by the HSS cannot meet the current needs of the user, and the I-CSCF reselects an S-CSCF from the S-CSCF capability information that satisfies the strictest service subscription requirement of the user, and acquires the new one.

The S-CSCF is the address of the S-CSCFn.

Step 106: The I-CSCF sends a Register message to the S-CSCFn, that is, the newly selected

S-CSCF.

Step song 107, S-CSCFn sends a MAR (Multimedia-Authentication-Request) message to the HSS, requesting user description information for authentication. Specifically, the message on the Cx interface between the S-CSCFn and the HSS is Cx-AuthDataReq. .

Step 108: After receiving the foregoing information, the HSS determines whether the name of the S-CSCFn requesting the user description information is the same as the name of the S-CSCFo stored locally for the user, and determines the locally saved S-served for the user. Whether the CSCFo has been identified as likely to be modified, in this embodiment, since the S-CSCFo has been identified as likely to be modified, and the I-CSCF has reselected the S-CSCF, the S-CSCFn ό name and S - The name of CSCFo is definitely different, so the HSS determines that the name of S-CSCFn is different from the name of S-CSCFo, and that S-CSCFo has been identified as likely to be modified, HSS is cleared to S-CSCFo and may have been set. Modified identifier, send RTR to S-CSCFo (Registration-Termination-Request) message, specifically, the message on the Cx interface between the HSS and the S-CSCFo is Cx-Deegister, to notify the S-CSCFo to initiate the logout process, and the reason for the logout is included in the logout notification. The reason for the logout is that a new server (NEW_SERVER_ASSSIGNED) or a server change (SERVER_CHANGE) is assigned, or other logout reasons may be used. In short, the S-CSCFo is notified to clear the currently existing service information, which is not limited. The specific reason for cancellation.

Step 109: After receiving the foregoing message, the S-CSCFo performs service control related to the logout, and updates the local information. At the same time, the S-CSCFo triggers the operation of terminating the subsequent service with the user.

Step 1 10: The S-CSCFo returns an RTA (Registration-Termination- Answer) message to the HSS. Specifically, the message on the Cx interface between the S-CSCFo and the HSS is Cx-Deregister Resp, and the HSS returns a logout response, ending. The cancellation process.

Steps 111 to 112, the HSS overwrites the name of the S-CSCFo with the name of the S-CSCFn, and simultaneously queries the user description information required by the S-CSCFn according to the user identifier, and returns a MAA (Multimedia-Authentication- Answer) message to the S-CSCFn. The message on the Cx interface between HSS and S-CSCFn is Cx-AuthDataResp.

After receiving the above message, the S-CSCFn sends an Unauthorised message to the user to notify the user to re-register. The message includes information such as authentication vector information, and the message is sent to the I-CSCF and the P-CSCF. The forwarding arrives at the user.

Step 116 to step 117, the user re-initiates the registration request, and the P-CSCF will

The REGISTER message is forwarded to the I-CSCF.

Step 1 18 to step 119, the I-CSCF sends a UAR message to the HSS. Specifically, the message on the Cx interface between the I-CSCF and the HSS is a Cx-Query or Cx-Select-Pull message; the HSS gives the I-CSCF Return the UAA message. Specifically, the message on the Cx interface between the I-CSCF and the HSS is Cx-Query Resp or Cx-Select-Pull. Resp message. At this time, since it has been determined that the S-CSCFn is serving the user, the message returned by the HSS to the I-CSCF includes only the name of the S-CSCFn.

Step 120: The I-CSCF sends a Register message to the S-CSCFn.

Steps 121 to 122, the S-CSCFn performs an Authentication operation, and then sends a SAR (Server-Assignment-Request) message to the HSS. Specifically, the message on the Cx interface between the S-CSCFn and the HSS is Cx. -Put or Cx-Pull to request user description information.

Step 123: The HSS returns a SAA (Server-Assignment- Answer) message to the S-CSCFn. Specifically, the message on the Cx interface between the HSS and the S-CSCFn is Cx-Put Resp or Cx-Pull Resp.

Steps 124 to 126, the S-CSCFn returns a message of successful registration to the UA, and the message is forwarded to the UA via the I-CSCF and the P-CSCF.

At this point, in the case of the S-CSCF update, the old S-CSCF that has not yet notified the locally saved service that has served the user is prevented from initiating the logout process, and the old S is overwritten with the name of the new S-CSCF. - The name of the CSCF, and solve the corresponding problems, such as the network side continues to deal with a large amount of redundant information, or business errors.

FIG. 2 is a flow chart showing the application of the second embodiment of the present invention. In this embodiment, the user is not registered but has contracted a service related to the unregistered state and is called as a called party. In the embodiment, the old S-CSCF that originally provided the service for the user is referred to as S-CSCFo, and the new S-CSCF that is reselected by the I-CSCF is referred to as S-CSCFn.

Step 201: The I-CSCF in the called home network receives the INVITE request.

Step 202: The I-CSCF sends an LIR (Location-Info-Request) message to the HSS. Specifically, the message on the Cx interface between the I-CSCF and the HSS is Cx-Location-Query.

Step 203: The HSS returns LIA (Location-Info-Answer) to the I-CSCF. Specifically, the message on the Cx interface between the I-CSCF and the HSS is Cx-Location-Query Resp.

In this embodiment, if the HSS determines that the I-CSCF needs to reselect the S-CSCF according to the change of the user subscription information saved by itself, the Cx-Location-Query Resp message includes the locally saved service that has been served by the user. The name of the S-CSCF and the S-CSCF capability information that satisfies the user's most stringent service subscription requirements. The HSS sets an identifier indicating that the S-CSCF may be modified for the S-CSCF that is returned to the I-CSCF, that is, the S-CSCFo.

If the S-CSCF needs to be re-selected in the query information received by the HSS, the C-Query Resp or Cx-Select-Pull Resp message includes the S-CSCF capability information that meets the most stringent service subscription requirements of the user, and then The HSS sets a flag for the locally saved S-CSCF that has served the user indicating that the S-CSCF may be modified.

Step 204: Determine, by the I-CSCF, whether the name of the S-CSCF returned by the HSS can meet the current needs of the user. If yes, the B-J I-CSCF continues to interact with the S-CSCF returned by the HSS. In this embodiment, ^^ The name of the S-CSCF returned by the HSS cannot meet the current needs of the user. The I-CSCF reselects an S-CSCF from the S-CSCF capability information that meets the most stringent service subscription requirements of the user, and obtains the new S- CSCF is the IP address of S-CSCFn.

Step 205: The I-CSCF sends an INVITE message to the S-CSCFn, that is, the newly selected

S-CSCF.

Step 206: The S-CSCFn sends a SAR (Server-Assignment-Request) message to the HSS. Specifically, the message on the Cx interface between the S-CSCFn and the HSS is Cx-Put or Cx-Pull, to request user description information. .

Step 207: After receiving the foregoing information, the HSS determines that the user description information is requested. Whether the name of the S-CSCFn is the same as the name of the S-CSCFo stored locally for the user, and it is determined whether the locally saved S-CSCFo serving the user has been identified as being possible to be modified, in this embodiment. Since the S-CSCFo has been identified as likely to be modified, and the I-CSCF has reselected the S-CSCF, the name of the S-CSCFn and the name of the S-CSCFo are definitely different, so the HSS determines the S-CSCFn. The name of the name S-CSCFo is different, and the S-CSCFo has been identified as possibly modified. The HSS clears the identifier that may have been modified for the S-CSCFo, and sends an RTR (Registration-Termination-Request) message to the S- CSCFo, specifically, the message on the Cx interface between the HSS and the S-CSCFo is Cx-Deregister, to notify the S-CSCFo to initiate the logout process, and the reason for the logout is included in the logout notification, and the reason for the logout may be a new assignment The server (NEW-SERVER-ASSIGNED) can also be a server change (SERVER-CHANGE), or other reasons for logout. In short, the specific reason for logout is not limited.

Step 208: After receiving the foregoing message, the S-CSCFo performs the business control related to the logout, and updates the local information. At the same time, the S-CSCFo triggers the operation of terminating the subsequent service with the user.

Step 209, S-CSCFo returns RTA to HSS

(Registration-Termination- Answer) message, specifically, the message on the Cx interface between the S-CSCFo and the HSS is Cx-Deregister Resp, which returns a logout response to the HSS, and ends the logout process.

Step 210: The HSS overwrites the name of the S-CSCFo with the name of the S-CSCFn, and simultaneously queries the user description information required by the S-CSCFn according to the user identifier, and returns a SAA (Server-Assignment-Answer) message to the S-CSCFn. Specifically, The message on the Cx interface between HSS and S-CSCFn is Cx-Put Resp or Cx-Pull Resp.

Step 21: The S-CSCFn sends the registration information to the relevant information according to the received information. The business control platform performs the appropriate business control process.

Step 212: The S-CSCFn continues to perform subsequent operations according to the service requirement.

So far, in the case of the S-CSCF update, it is avoided that the HSS has not notified the locally saved old S-CSCF that has served the user to initiate the logout process, and overwrites the old S- with the new S-CSCF name. The name of the CSCF, and solve the corresponding problems, such as the network side continues to deal with a lot of redundant information, or business errors.

For the above two embodiments, if the HSS determines that the name of the S-CSCF requesting the user description information is the same as the name of the locally saved S-CSCF serving the user, and the locally saved S-CSCF serving the user has been If it is identified as likely to be modified, the set identifier is cleared, and then the subsequent processing is continued according to the existing normal process; if the HS S determines the name of the S-CSCF requesting the user description information and the locally saved service for the user If the name of the S-CSCF is different, and the locally saved S-CSCF serving the user is not identified as likely to be modified, the HSS reports an error and then continues the subsequent processing according to the existing error procedure; if the HSS determines the requesting user description The name of the S-CSCF of the information is the same as the name of the S-CSCF that is locally saved for the user service, and the locally saved S-CSCF serving the user is not identified as likely to be modified, according to the existing normal process. Continue to follow up.

For the above judgment, the HSS may first determine whether the name of the S-CSCF requesting the user description information is the same as the name of the locally saved S-CSCF serving the user, and then determine whether the locally saved S-CSCF serving the user has been It is identified as being possible to be modified; it may also be first determined whether the locally saved S-CSCF serving the user has been identified as likely to be modified, and then the name of the S-CSCF requesting the user description information is locally saved as Whether the name of the S-CSCF of the user service is the same.

In the above-mentioned embodiment, the HSS is based on the received message requesting user description information from the S-CSCF, and determines the name and the name of the S-CSCF requesting the user description information. The name of the S-CSCF that is saved for the user is the same, to determine whether the S-CSCF has been updated. In the specific implementation, other methods can be used to determine whether the S-CSCF has been updated. For example, the HSS passes the check. Whether the notification of the update S-CSCF from the I-CSCF is received to determine whether the S-CSCF has been updated, that is, if the HSS receives the notification of the update S-CSCF from the I-CSCF, it is confirmed that the S-CSCF has been updated, otherwise HSS believes that the S-CSCF has not been updated. The S-CSCF that avoids the I-CSCF reselection causes the same interaction process as the original S-CSCF saved. At the same time, since the S-CSCF that may be updated is set with an identifier that may be modified, it is possible to The S-CSCF is differentiated from the error conditions that may occur in the processing.

For all of the above embodiments, if the HSS has set an identifier that may be modified for a certain S-CSCFo, and before the clearing of the possibly modified identifier, an I-CSCF receives a certain user as the called party. Call request, and the user who is called is served by the S-CSCFo, when an I-CSCF that processes the 'call request queries the HSS for the S-CSCF currently serving the user, The HSS may decide to temporarily suspend the query request according to the set identifier that may be modified until the CX-Put or CX-Pull message from an S-CSCF determines the S-CSCFn, and directly returns the current service to the user. The S-CSCFn, this process may make the delay slightly larger, but it is still within acceptable limits. Moreover, this can further ensure that the user operates normally as a called party in the alternating phase of the old and new S-CSCF.

The I-CSCF that processes the call request and the I-CSCF that needs to perform the reselection S-CSCF operation in the foregoing various embodiments may be the same I-CSCF or different I-CSCFs. The S-CSCFo and S-CSCFn in the above processing may be the same S-CSCF or different S-CSCFs. Further, a timer for the suspended call may be further set, and the timer is started immediately when the query request is suspended, and if the preset timing time is reached, the query request is still in a suspended state. The query request is forcibly disconnected to avoid problems such as a decrease in user satisfaction and a waste of system resources due to the query request being suspended for a long time.

In addition, after the HSS receives the query information from the I-CSCF, it is determined that the I-CSCF needs to reselect the S-CSCF, and directly notifies the locally saved S-CSCF that serves the user to initiate the logout process, and then presses no. The process of saving the S-CSCF name is completed to complete the subsequent operations. This may add some extra processes, but it requires little change to existing systems and is more compatible with existing systems.

Fig. 3 is a flow chart showing the third embodiment to which the present invention is applied. In this embodiment, the user performs a registration operation, and the old S-CSCF that originally provided the service for the user is referred to as S-CSCFo, and the new S-CSCF that is reselected by the I-CSCF is referred to as S-CSCFn.

Step 301 to step 302, the user initiates registration, and the registration request (REGISTER) is forwarded to the I-CSCF by the user agent device (UA, user agent) and the P-CSCF.

Step 303: The 1-CSCF sends a UAR (User-Authorization-Request) message to the HSS. Specifically, the message on the Cx interface between the I-CSCF and the HSS is a Cx-Query or a Cx-Select-Pull message.

Step 304: After determining that the I-CSCF needs to reselect the S-CSCF, the HSS sends an RTR (Registration-Termination-Request) message to the S-CSCFo. Specifically, the message on the Cx interface between the HSS and the S-CSCFo is Cx-Deregister, to notify S-CSCFo to initiate the logout process, including the reason for the logout in the logout notification, which may be assigned a new server (NEW_SERVER_ASSIGNED) or a server change (SERVER_CHANGE), It can be other reasons for cancellation. In short, the specific reason for cancellation is not limited. The HSS determines that the I-CSCF needs to reselect the S-CSCF according to the information indicating the reselection of the S-CSCF in the query information from the I-CSCF, or determines that the I-CSCF needs to be reselected according to the change of the user subscription information saved by itself. S-CSCF.

Step 305: After receiving the foregoing information, the S-CSCFo performs service control related to the logout, and updates the local information. At the same time, the S-CSCFo triggers the operation of terminating the subsequent service with the user.

Step 306, S-CSCFo returns RTA to HSS

Step 307: The HSS clears the name of the locally saved S-CSCFo, and the HSS returns a UAA (User-Authorization-Answer) message to the I-CSCF. Specifically, the message on the Cx interface between the I-CSCF and the HSS is Cx- Query Resp or Cx-Select-Pull Resp message, which contains S-CSCF capability information that meets the most stringent service subscription requirements of the user.

Step 308: The I-CSCF reselects an S-CSCF from the S-CSCF capability information that meets the strictest service subscription requirement of the user, and obtains the address of the new S-CSCF, that is, the S-CSCFn.

Step 309, the I-CSCF sends a Register message to the S-CSCFn, that is, the newly selected S-CSCF.

Step 310: The S-CSCFn sends a MAR (Multimedia-Authentication-Request) message to the HSS, requesting the user to describe the information for authentication. Specifically, the message on the Cx interface between the S-CSCFn and the HSS is Cx-AuthDataReq.

Step 311: Query, according to the user identifier, user description information required by the S-CSCFn. Step 312, the HSS sends a MAA (Multimedia-Authentication-Answer) The message is sent to the S-CSCFn. Specifically, the message on the Cx interface between the HSS and the S-CSCFn is Cx-AuthDataResp.

Step 313 to step 315, after receiving the message, the S-CSCFn sends an Unauthorised message to the user, and notifies the user to re-register, the message includes information such as authentication vector information, and the message is forwarded by the I-CSCF and the P-CSCF. Reach the user.

Step 316 to step 317, the user re-initiates the registration request, and the P-CSCF forwards the REGISTER message to the I-CSCF.

Step 318 to step 319, the I-CSCF sends a UAR message to the HSS. Specifically, the message on the Cx interface between the I-CSCF and the HSS is a Cx-Query or Cx-Select-Pull message; the HSS returns to the I-CSCF. The UAA message, specifically, the message on the Cx interface between the I-CSCF and the HSS is a Cx-Query Resp or Cx-Select-Pull Resp message. At this time, since it has been determined that the S-CSCFn is serving the user, the message returned by the HSS to the I-CSCF includes only the name of the S-CSCFn.

Step 320: The I-CSCF sends a Register message to the S-CSCFn.

Steps 321 to 322, the S-CSCFn performs an Authentication operation, and then sends a SAR (Server-Assignment-Request) message to the HSS. Specifically, the message on the Cx interface between the S-CSCFn and the HSS is Cx. -Put or Cx-Pull to request user description information.

Step 323: The HSS returns a SAA (Server- Assignment- Answer) message to the S-CSCFn. Specifically, the message on the Cx interface between the HSS and the S-CSCFn is Cx-Put Resp or Cx-Pull Resp.

Step 324~ Step 326, the S-CSCFn returns a message of successful registration to the UA, and the message is forwarded to the UA via the I-CSCF and the P-CSCF.

At this point, it avoids that the old S-CSCF that has not yet notified the locally saved service that has served the user initiates the logout process, and overwrites the old one with the new S-CSCF name. The name of the S-CSCF, and solves the corresponding problems caused by it, such as the network side continues to process a large amount of redundant information, or business errors.

Of course, if the user does not register but subscribes to the service related to the unregistered state, and as the called party, when the I-CSCF in the called home network receives the INVITE request, the processing procedure is similar to the above, that is, the HSS determines that After the S-CSCF is re-selected by the I-CSCF, the RTR (Registration-Termination-Request) message is sent to the S-CSCFo to notify the S-CSCFo to perform the logout process. The subsequent processing is the same as the prior art, and is not repeated here. Description.

The present invention also provides two timing systems for determining the initiation of the logout process.

For example, the system includes at least a user home network server HSS, an inquiry call state control function entity I-CSCF and a service call state control function entity S-CSCF, and the HSS includes a logout module for executing a logout process, The system also includes an identity setting module for setting an identifier that may be modified for the S-CSCF,

The HSS checks that the S-CSCF has been updated, and the locally saved S-CSCF serving the user has been identified as being likely to be modified, and the HSS triggers the identifier setting module again, and the identifier setting module clears the set The identification, notifying the logout module in the HSS, the logout module initiates a logout process to the locally saved S-CSCF serving the user.

If the HSS checks that the S-CSCF is not updated, and the locally saved S-CSCF serving the user has been identified as likely to be modified, the HSS triggers the identity setting module again, and the identity setting module clears the set Logo.

If the HSS checks that the S-CSCF has been updated, and the locally saved is the user service The S-CSCF of the service is not identified as being likely to be modified, and the HSS triggers an error module that already exists in itself, and the error module performs an error processing flow.

If the HSS detects that the S-CSCF is not updated, and the locally saved S-CSCF serving the user is not identified as likely to be modified, then the situation at this time is exactly the same as the existing implementation, that is, completely Existing methods are processed.

In another example, the system includes at least a user home network server HSS, an inquiry call state control function entity I-CSCF, and a service call state control function entity S-CSCF, and the HSS includes a logout module for performing a logout process. ,

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims

Claim

A method for determining an opportunity to initiate a logout process, the method comprising the steps of:

After the user home network server HSS determines that the call state control function entity I-CSCF needs to reselect the service call state control function entity S-CSCF that provides service for a certain user, the locally saved S that has served the user - the CSCF setting indicates the identity that the S-CSCF may be modified;

The HSS checks whether the S-CSCF has been updated, and whether the locally saved S-CSCF serving the user has been identified as likely to be modified if the S-CSCF has been updated and the locally saved S serviced for the user - The CSCF has been identified as likely to be modified, and the HSS clears the set identity and notifies the locally saved S-CSCF serving the user to initiate the logout process.

The method according to claim 1, wherein the method for checking whether the S-CSCF has been updated by the HSS is:

3. The method according to claim 2, wherein the method further comprises: if the HSS determines that the name of the S-CSCF requesting the user description information is the same as the name of the locally saved S-CSCF serving the user, And the locally saved S-CSCF serving the user has been identified as likely to be modified, then the set identifier is cleared, and then the subsequent processing is continued according to the existing normal process.

The method according to claim 2, wherein the method further comprises: if the HSS determines that the name of the S-CSCF requesting the user description information is locally saved as the The name of the S-CSCF of the user service is different, and the locally saved S-CSCF serving the user is not identified as being likely to be modified, the HSS reports an error, and then the subsequent processing is continued according to the existing error procedure.

5. The method of claim 2, wherein the method further comprises: if the HSS determines that the name of the S-CSCF requesting the user description information is the same as the name of the locally saved S-CSCF serving the user, If the locally saved S-CSCF serving the user is not identified as likely to be modified, the subsequent processing is continued according to the existing normal process.

6. The method according to claim 2, 3, 4 or 5, wherein the HSS first determines the name of the S-CSCF requesting the user description information and the name of the S-CSCF locally saved for the user service. Whether it is the same, and then determine whether the locally saved S-CSCF serving the user has been identified as likely to be modified, or

The HSS first determines whether the locally saved S-CSCF serving the user has been identified as likely to be modified, and then determines the name of the S-CSCF requesting the user description information and the locally saved S-CSCF serving the user. Is the name the same?

The method according to claim 1, wherein the method for the HSS to check whether the S-CSCF has been updated is: the HSS checks whether a notification of the updated S-CSCF from the I-CSCF is received, if the The notification is updated by the S-CSCF, otherwise the S-CSCF is not updated.

8. The method according to claim 1, wherein the method further comprises: after the HSS has set an identifier that may be modified for an S-CSCF, before the identifier that may be modified is cleared. If an I-CSCF receives a call request from a user served by the S-CSCF as a called party, when an I-CSCF that processes the call request queries the HSS for an S-CSCF currently serving the user When the HSS temporarily suspends the query request until it determines the S-CSCF currently serving the user, it directly returns the S-CSCF currently serving the user.

9. The method according to claim 8, wherein the processing the call please A certain I-CSCF is the same I-CSCF or a different I-CSCF than the I-CSCF that needs to perform the reselection of the S-CSCF operation.

10. The method of claim 8, wherein after the HSS receives the CX-Put or CX-Pull message from the S-CSCF, determining that the S-CSCF is the S- currently serving the user. CSCF.

11. The method of claim 8, wherein the method further comprises: presetting a timer for the suspended call, starting the timer when the query request is suspended, if the preset is reached After the timed time, the query request is still in a suspended state, and the query request is forcibly broken.

12. The method of claim 1, wherein the identifier indicating that the S-CSCF may be modified is a flag bit.

13. The method of claim 1 wherein:

The information that the locally saved S-CSCF that initiates the logout process for the user initiates the logout process includes a logout reason;

The method further includes: locally saving the user service. The S-CSCF performs service control related to the logout according to the logout reason in the received logout notification, updates the local information, and then returns a logout response to the HSS;

The method according to claim 1, wherein the HSS determines that the I-CSCF needs to reselect the S-CSCF according to the information indicating the reselection of the S-CSCF in the query information from the I-CSCF, or the HSS according to itself The change of the saved user subscription information determines that the I-CSCF needs to reselect the S-CSCF.

15. The method according to claim 1, wherein the reason for the cancellation is Equipped with a new server NEW_SERVER_ASSSIGNED, or set to server to change SERVER_CHANGE.

16. The method according to claim 1, wherein the HSS receives a user registration status query message (Cx-Query or Cx-Select-Pull) from the I-CSCF, or a user location query message (Cx- After Location-Query, it performs an operation to determine whether the I-CSCF needs to reselect the S-CSCF.

17. A method of determining an opportunity to initiate a logout process, the method comprising the steps of:

After the HSS determines that the I-CSCF needs to reselect the S-CSCF, it notifies the locally saved S-CSCF serving the user to initiate the logout process.

The method according to claim 17, wherein the HSS determines, according to the information indicating the reselection of the S-CSCF in the query information from the I-CSCF, that the I-CSCF needs to reselect the S-CSCF, or the HSS saves itself. The change of the user subscription information determines that the I-CSCF needs to reselect the S-CSCF.

19. The method of claim 17 wherein:

After receiving the logout response, the HSS clears the locally saved S-CSCF name, and then returns the S-CSCF capability information that meets the strictest service subscription requirement of the user to the I-CSCF, and then processes the S-CSCF name locally. Continue to follow up.

20. The method according to claim 17, wherein the reason for the logout is that a new server NEW_SERVER_ASSIGNED is assigned, or is set to be changed by the server. SERVER_CHANGE.

21. The method according to claim 17, wherein the HSS receives a user registration status query message (Cx-Query or Cx-S elect-Pull) from the I-CSCF, or a user location query message (Cx) After -Location-Query, it performs an operation to determine whether the I-CSCF needs to reselect the S-CSCF.

22. A system for implementing the method of claim 1, configured to determine an opportunity to initiate a logout process, comprising at least a user home network server HSS, an inquiry call state control function entity I-CSCF, and a service call state control function entity S- a CSCF, and the logout module for performing a logout process is included in the HSS, wherein the system further includes an identifier setting module for setting an identifier that may be modified for the S-CSCF,

The HSS checks that the S-CSCF has been updated, and the locally saved S-CSCF serving the user has been identified as likely to be modified, and the HSS triggers the identity setting module again, and the identity setting module clears the set The identification, notifying the logout module in the HSS, the logout module initiates a logout process to the locally saved S-CSCF serving the user.

23. The system according to claim 22, wherein if the HSS checks that the S-CSCF is not updated, and the locally saved S-CSCF serving the user has been identified as likely to be modified, the HSS The identification setting module is triggered again, and the identified setting is cleared by the identification setting module.

24. The system according to claim 23, wherein if the HSS checks that the S-CSCF has been updated, and the locally saved S-CSCF serving the user is not identified as likely to be modified, the HSS Triggering the existing 4 error module in the self, and the 4 error module The processing flow for executing an error.

25. A system for implementing the method of claim 17, for determining a timing of initiating a logout process, the system comprising at least a user home network server HSS, an inquiry call state control function entity I-CSCF, and a service call state control function entity An S-CSCF, and the logout module for performing a logout process is included in the HSS, wherein