WO2017036227A1

WO2017036227A1 - Method and device realizing terminal called service restoration

Info

Publication number: WO2017036227A1
Application number: PCT/CN2016/085852
Authority: WO
Inventors: 王新勇; 李云飞
Original assignee: 华为技术有限公司
Priority date: 2015-08-28
Filing date: 2016-06-15
Publication date: 2017-03-09
Also published as: CN106488475B; CN106488475A

Abstract

The present invention discloses a method and device realizing terminal called service restoration, in which it is not necessary to trigger a terminal by a PCRF to repeatedly register an alternative P-CSCF, reducing deployment difficulty and saving resources. The method comprises: an alternative P-CSCF/SBC receiving a request message sent by an S-CSCF, the request message being generated by the S-CSCF when a P-CSCF/SBC registered by a user terminal corresponding to a received called request experiences a failure; the alternative P-CSCF/SBC, according to a mapping relationship between a pre-established gateway and each user terminal belonging to the gateway, determining a home gateway of the user terminal; and the alternative P-CSCF/SBC sending, via a TWAMP link with the home gateway, a trigger message to the home gateway, the trigger message being for triggering a user terminal to re-register to the alternative P-CSCF/SBC so as to carry the user terminal called service.

Description

Method and device for realizing recovery of terminal called service

This application claims priority to Chinese Patent Application No. 201510540895.2, entitled "A Method and Apparatus for Recovering Terminal Called Service Recovery", filed on August 28, 2015, the entire contents of which are hereby incorporated by reference. Combined in this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for implementing recovery of a called service of a terminal.

Background technique

The call session control function (English: Call Session Control Function, CSCF for short) is a functional entity in the IP Multimedia Subsystem (IMS), which is mainly responsible for handling signaling control during the multimedia call session. The CSCF can be divided into a proxy CSCF (English: Proxy CSCF, abbreviated as: P-CSCF), a query CSCF (English: Interrogating CSCF, referred to as: I-CSCF), and a service CSCF (English: Serving CSCF, referred to as S-CSCF).

In the service control process, if the P-CSCF fails, the user terminal registered by the P-CSCF, if it is called, the S-CSCF finds that the P-SCCF is faulty when managing the called service, then The user terminal cannot be contacted through the P-CSCF, causing the service to fail.

In the prior art, the primary and backup devices are composed by two P-CSCFs. When one P-CSCF fails, the service can be taken over by the candidate P-CSCF. The S-CSCF/Interconnection Border Control Function (IBCF) connected to the P-CSCF can detect the P-CSCF failure through the Session Initiation Protocol (SIP) request message detection. Then select an alternate P-CSCF based on the disaster tolerance priority. However, the candidate P-CSCF needs to notify the terminal to re-register the device by managing the policy and charging rule function (English: Policy and Charging Rules Function, PCRF) of the terminal and the path of the gateway connected to the terminal. The P-CSCF is selected, so that the S-CSCF sends the called request to the candidate P-CSCF, and the candidate P-CSCF carries the called service of the terminal.

Therefore, in the P-CSCF disaster recovery scenario, the dependence on the PCRF is high. Moreover, when the terminal roams, the PCRF of the home location and the PCRF of the visited place need to be involved, and the networking is complicated, which increases the difficulty of deployment.

Summary of the invention

The embodiment of the invention provides a method and a device for realizing the recovery of the called service of the terminal. The PCRF is not required to trigger the terminal to re-register the candidate P-CSCF, which reduces the deployment difficulty and saves resources.

In a first aspect, an embodiment of the present invention provides a method for implementing recovery of a called service of a terminal, including:

The alternate proxy call session control function entity P-CSCF/session border controller SBC receives the request message sent by the serving call session control function entity S-CSCF; the request message is that the S-CSCF corresponds to the received called request The P-CSCF/SBC registered by the user terminal is generated when the fault occurs; the request message is used to indicate that the user terminal is triggered to re-register to the candidate P-CSCF/SBC;

Determining, by the P-CSCF/SBC, the home gateway of the user terminal according to a mapping relationship between the pre-established gateway and each user terminal belonging to the gateway;

The candidate P-CSCF/SBC sends a trigger message to the home gateway through a bidirectional active measurement protocol TWAMP link with the home gateway, the trigger message is used to trigger the user terminal to re-register to the The alternative P-CSCF/SBC is to carry the called service of the user terminal.

In combination with the first aspect, in a first possible implementation manner of the first aspect, the method further includes:

After the user terminal re-registers to the candidate P-CSCF/SBC, the candidate P-CSCF/SBC identifies the candidate P-CSCF/SBC and registers the candidate P-CSCF/ The username of the user terminal of the SBC is sent to the home gateway.

In conjunction with the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the user name is an International Mobile Subscriber Identity (IMSI) or a subscriber number.

With reference to the first aspect, and any one of the first to the second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, the establishing the mapping relationship includes:

Obtaining an identifier of the gateway during establishing a TWAMP link with the gateway;

Receiving, by the gateway, a user identifier of a user terminal that belongs to the gateway;

Establishing a mapping relationship between the identifier of the gateway and the user identifier of the user terminal that belongs to the gateway.

With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the user identifier of the user terminal is: the gateway is allocated to each user terminal that belongs to the gateway Internet Protocol IP address.

With reference to the first aspect, and any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the identifier of the gateway is Device ID or IP address.

With reference to the first aspect, and any one of the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes:

When the candidate P-CSCF/SBC cannot determine the home gateway of the user terminal according to the mapping relationship between the pre-established gateway and each user terminal belonging to the gateway, the candidate P-CSCF/SBC to the S The CSCF sends a failure response message, which is used to indicate that the triggering of the user terminal to re-register to the candidate P-CSCF/SBC fails.

In a second aspect, an embodiment of the present invention provides a method for implementing recovery of a called service of a terminal, including:

When the proxy call session control function entity P-CSCF/SBC registered by the user terminal fails, the home gateway of the user terminal receives the TWAMP link through a bidirectional active measurement protocol with the alternate P-CSCF/SBC. a trigger message sent by the candidate P-CSCF/SBC, the trigger message is used to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal;

Querying, by the home gateway, the P-CSCF/SBC registered by the user terminal according to a pre-established mapping relationship between the user terminal that registers the candidate P-CSCF/SBC and the candidate P-CSCF/SBC The alternative P-CSCF/SBC is a different P-CSCF/SBC;

The home gateway notifies the user terminal to re-register to the candidate P-CSCF/SBC.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes:

After the user terminal re-registers to the candidate P-CSCF/SBC, the home gateway receives the identifier of the candidate P-CSCF/SBC sent by the candidate P-CSCF/SBC and the User ID of the user terminal;

The home gateway records the mapping relationship between the candidate P-CSCF/SBC and the user terminal according to the identifier of the candidate P-CSCF/SBC and the user identifier of the user terminal.

In a third aspect, an embodiment of the present invention provides an apparatus for implementing recovery of a called service of a terminal, where the apparatus is implemented by an alternate proxy call session control function entity P-CSCF/Session Border Controller SBC, including:

a receiving unit, configured to receive a request message sent by the serving call session control function entity S-CSCF; the request message is that the receiving unit fails in the P-CSCF/SBC registered by the user terminal corresponding to the received called request The request message is used to indicate that the user terminal is triggered to re-register to the device;

a processing unit, configured to: when the receiving unit receives the request message, determine a home gateway of the user terminal according to a mapping relationship between a pre-established gateway and each user terminal that belongs to the gateway;

a sending unit, configured to send a trigger message to the home gateway determined by the processing unit by using a bidirectional active measurement protocol TWAMP link with the home gateway, where the trigger message is used to trigger the user terminal to re-register to The device is configured to carry the called service of the user terminal.

In conjunction with the third aspect, in a first possible implementation manner of the third aspect, the sending unit is further configured to:

After the user terminal re-registers to the device, the identifier of the device and the user name of the user terminal that registers the device are sent to the home gateway determined by the processing unit.

In conjunction with the first possible implementation of the third aspect, in a second possible implementation of the third aspect, the user name is an International Mobile Subscriber Identity (IMSI) or a subscriber number.

With reference to the third aspect and any one of the first to the second possible implementation manners of the third aspect, in a third possible implementation manner of the third aspect, the method further includes:

An obtaining unit, configured to acquire an identifier of the gateway during establishing a TWAMP link with the gateway;

The receiving unit is further configured to receive a user identifier of the user terminal that is sent by the gateway and belongs to the gateway;

The processing unit is further configured to establish a mapping relationship between the identifier of the gateway and a user identifier of a user terminal that belongs to the gateway.

With reference to the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the user identifier of the user terminal is: the gateway is allocated to each user terminal that belongs to the gateway Internet Protocol IP address.

Combining the third aspect with any one of the first to fourth possible implementations of the third aspect, in a third aspect In a fifth possible implementation manner, the identifier of the gateway is a device number ID or an IP address of the gateway.

With reference to the third aspect and any one of the first to fifth possible implementation manners of the third aspect, in a sixth possible implementation manner of the third aspect, the processing unit is configured according to the pre-established The sending unit is further configured to send a failure response message to the S-CSCF, where the mapping relationship between the gateway and each user terminal that belongs to the gateway cannot determine the home gateway of the user terminal, where the failure response message is used to indicate Triggering the user terminal to re-register to the device fails.

In a fourth aspect, an embodiment of the present invention provides a device for implementing recovery of a called service of a terminal, where the device is implemented by a home gateway of the user terminal, and includes:

a receiving unit, configured to receive the candidate by a bidirectional active measurement protocol TWAMP link between the candidate P-CSCF/SBC when the proxy call session control function entity P-CSCF/SBC registered by the user terminal fails a trigger message sent by the P-CSCF/SBC, the trigger message is used to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal;

a querying unit, configured to query, according to a pre-established mapping relationship between the user terminal that registers the candidate P-CSCF/SBC and the candidate P-CSCF/SBC, the P-CSCF/SBC registered by the user terminal The alternative P-CSCF/SBC is a different P-CSCF/SBC;

And a notification unit, configured to notify the user terminal to re-register to the candidate P-CSCF/SBC.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the receiving unit is further configured to: after the user terminal re-registers to the candidate P-CSCF/SBC, receive the device Selecting an identifier of the candidate P-CSCF/SBC sent by the P-CSCF/SBC and a user identifier of the user terminal;

The device also includes:

a recording unit, configured to record a mapping between the candidate P-CSCF/SBC and the user terminal according to the identifier of the candidate P-CSCF/SBC and the user identifier of the user terminal received by the receiving unit relationship.

With the solution provided by the embodiment of the present invention, the candidate P-CSCF/SBC receives the notification message sent by the S-CSCF; the notification message is the P registered by the user terminal corresponding to the received called request by the S-CSCF. - generated when the CSCF/SBC fails; the notification message is used to indicate that the user terminal is triggered to re-register to the candidate P-CSCF/SBC; then the candidate P-CSCF/SBC is based on a pre-established gateway Determining a home gateway of the user terminal with a mapping relationship with each user terminal belonging to the gateway; the candidate P-CSCF/SBC to the home through a bidirectional active measurement protocol TWAMP link with the home gateway The gateway sends a trigger message, where the trigger message is used to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal. Therefore, it is no longer necessary to trigger the PCRF to the gateway to notify the user terminal to re-register the P-CSCF/SBC, which reduces the deployment difficulty, avoids signaling interaction with the PCRF, and reduces signaling overhead.

DRAWINGS

FIG. 1 is a schematic diagram of a TWAMP architecture according to an embodiment of the present invention;

2 is a schematic diagram of another TWAMP architecture according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a process of establishing a TWAMP link according to an embodiment of the present invention;

4A-4B are schematic diagrams showing the structure of a system for realizing recovery of a called service of a terminal according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for implementing recovery of a called service of a terminal according to the present invention;

FIG. 6 is a flowchart of establishing a mapping relationship between an alternative P-CSCF/SBC and a gateway according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a P-CSCF disaster recovery backup relationship corresponding to a S-CSCF/IBCF and a gateway according to an embodiment of the present disclosure;

FIG. 8 is a flowchart of another method for implementing recovery of a called service of a terminal according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a process of establishing a control session between a P-CSCF and a PGW according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a mapping relationship between an IP address of a P-CSCF and a PGW according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a process of establishing a mapping relationship between a P-CSCF and an identifier of a UE according to an embodiment of the present disclosure;

FIG. 12 is a schematic flowchart of recovering a called service of a terminal according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of an apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of another apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present invention;

FIG. 15 is a schematic diagram of another apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present disclosure;

FIG. 16 is a schematic diagram of another apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention provides a method and a device for realizing the recovery of the called service of the terminal, so that when the P-CSCF is faulty, the address of the candidate P-CSCF is not required to be notified to the terminal through the PRCF, which reduces the difficulty of deployment and avoids Signaling interaction between PCRFs reduces signaling overhead. The method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.

Some of the terms provided herein are first explained to facilitate understanding by those skilled in the art:

1), user terminal

The user terminal to which the present invention relates may include a handheld device having a wireless communication function, an in-vehicle device, a wearable device, and various forms of user equipment and the like. The user terminal in the embodiment of the present invention is equivalent to the user equipment (English: User Equipment, UE for short) and is common to each other.

2) Two-way active measurement protocol (English: Two Way Active Measurement Protocol, TWAMP for short)

The TWAMP protocol is based on an end-to-end measurement method, that is, the measurement entities are hosts, and the network devices do not participate in the measurement.

TWAMP includes two separate protocols:

TWAMP-Control: Used to establish a measurement session and negotiate parameters of the session (such as packet length, start time, The abort time, the distribution parameters of the packet, etc.), start and terminate the measurement session, and obtain the measurement result (using the TCP protocol).

TWAMP-Test (TWAMP-Test): specifies the format of measurement packets, etc., used to perform measurement packet interaction between measurement nodes (using UDP protocol).

The TWAMP protocol consists of four functional entities, as shown in Figure 1, which are used to coordinate work and are responsible for initiating statistical sessions and frame transmission and reception:

Session-Sender: A measurement node that sends measurement messages in a TWAMP-Test session.

Session-Reflector: A measurement node that receives measurement packets in a TWAMP-Test session.

Server: Manages one or more TWAMP-Test sessions, which can be configured for each TWAMP-Test session on each measurement node, and can return measurements for each TWAMP-Test session.

Control-Client: Used to initiate a request to establish a TWAMP-Test session and to control the start and end of the session.

For the convenience of implementation, the above four functional entities can be flexibly combined, as shown in FIG. 2, so that the functions of Control-Client and Session-Reflectorr are implemented by one entity, and the functions of Server and Session-Sender are implemented by one entity.

As shown in FIG. 3, a process of establishing a TWAMP link between a Control-Client and a Session-Reflector and a Server and a Session-Sender, that is, a process of establishing a control session function based on the TCP protocol.

In step 301, a TCP connection is opened between the Server and the Session-Sender and the Control-Client and the Session-Reflector. Specifically, the TCP connection (Open TCP Connection on port 862) is opened through port 862.

In step 302, the Server and the Session-Sender initiate a Server Greeting request message to the Control-Client and the Session-Reflector.

In step 303, the Control-Client and the Session-Reflector send a session setup response message (Set-Up Response) to the server and the Session-Sender.

In step 304, the Server and the Session-Sender send a Service Start message (Server Start) to the Control-Client and the Session-Reflector. Thus Control-Client and Session-Reflector establish a control session function between Server and Session-Sender.

3), the symbol "/" in this article generally indicates that the contextual object is an "or" relationship.

4A-4B are schematic structural diagrams of a system for implementing recovery of a called service of a terminal according to an embodiment of the present invention. 4A-4B are only an example, and do not constitute a specific limitation on the number, structure, and the like of the devices.

FIG. 4A is a schematic structural diagram of a system for realizing recovery of a called service of a terminal when no roaming occurs on the user terminal. FIG. 4B is a schematic structural diagram of a system for realizing recovery of a called service of a terminal when a user terminal roams. As shown in FIG. 4A, the system of the embodiment of the present invention may specifically include: an S-CSCF 401, at least two P-CSCFs, and a user terminal 402, where the at least two P-CSCFs include a second P-CSCF 404 and The first P-CSCF 403 currently registered by the user terminal, and the gateway 405 to which the user terminal belongs. The second P-CSCF 404 is an alternate P-CSCF; the P-CSCF and the Session Border Controller (SBC) can be the same physical network element, so the present invention In the embodiment, the P-CSCF may also be an SBC.

For the scenario in which the user terminal does not roam, when the P-CSCF fails, the S-CSCF senses through the SIP request message. For example, as shown in FIG. 4A, the user terminal 402 is currently registered with the first P-CSCF 403. When the first P-CSCF 403 fails, the S-CSCF 401 can detect the perception. When the S-CSCF 401 detects that the first P-CSCF 403 is faulty, the second P-CSCF 404 is selected according to the disaster tolerance priority, and after the S-CSCF 401 selects the second P-CSCF 404, the request (Invite) message is sent to the second P. -CSCF404.

As shown in FIG. 4B, when the user terminal roams, the system in the embodiment of the present invention further includes a home IBCF 406 and a visited IBCF 407. The home IBCF is located in the local public land mobile network (English: Home Public Land Mobile Network, HPLMN for short). The visiting IBCF is located in the Visited Public Land Mobile Network (VPLMN). Between the home IBCF 406 and the visited IBCF 407, an Internet Packet Exchange Network (IP Packet Exchange, IP for short) network may be used. The S-CSCF 401 performs interworking control between the first P-CSCF 403 and the second P-CSCF 404 of the visited place through the home IBCF 406 and the visited IBCF 407.

The gateway 405 may be a public data network gateway (Public Data Network Gateway, PGW for short) or may be a service gateway (English: Serving Gateway, SGW for short).

After the IBCF 407 detects that the first P-CSCF 403 is faulty through the SIP request message, the visited IBCF 407 selects the second P-CSCF 404 to perform signaling routing, and the visited IBCF 407 receives the Invite message sent by the home IBCF 406, and sends the Invite message. Give the second P-CSCF 404.

FIG. 5 is a flowchart of a method for implementing recovery of a called service of a terminal according to an embodiment of the present invention. Specifically, the method of the embodiment of the present invention includes:

Step 501: The candidate P-CSCF/SBC receives the notification message sent by the S-CSCF, where the notification message is that the S-CSCF fails to register the P-CSCF/SBC registered by the user terminal corresponding to the received called request. The notification message is used to indicate that the user terminal is triggered to re-register to the candidate P-CSCF/SBC.

The notification message carries the username of the user terminal. The user name of the user terminal is used to identify the user terminal, and may be an International Mobile Subscriber Identification Number (IMSI) or a user number. It may also be an IP address of the user terminal, user service rights, and other user configuration information. The subscriber number may be a mobile station ISDN number (English: Mobile Subscriber International ISDN number, abbreviated as: MSISDN). Among them, ISDN is the integrated service digital network, which is the abbreviation of Integrated Service Digital Network.

Alternatively, the notification message can be an INVITE. The notification message carries a Restoration-Info header field. The candidate P-CSCF/SBC obtains the IMSI of the user terminal from the Resistance-Info header field. And obtaining the IP address of the user terminal through the route header field in the INVITE. The alternative P-CSCF/SBC determines that the registered user is not an alternate P-CSCF/SBC based on the IP address of the user terminal, and returns a failure response, such as 404, to the S-CSCF. The failure response is used to indicate that the user terminal is not an alternate P-CSCF/SBC Registered user.

Step 502: The candidate P-CSCF/SBC determines a home gateway of the user terminal according to a mapping relationship between the pre-established gateway and each user terminal that belongs to the gateway.

Step 503, the candidate P-CSCF/SBC sends a trigger message to the home gateway by using a TWAMP link with the home gateway, where the trigger message is used to trigger the user terminal to re-register to the standby device. The P-CSCF/SBC is selected to carry the called service of the user terminal.

Optionally, referring to FIG. 6, the manner of establishing the mapping relationship provided by the embodiment of the present invention is provided. A mapping relationship is established between the gateway and the P-CSCF/SBC. The following takes the process of establishing a mapping relationship between the alternative P-CSCF/SBC and the gateway as an example. Specifically, the method includes:

Step 601: In the process of establishing a TWAMP link with the gateway, the candidate P-CSCF/SBC acquires the identifier of the gateway.

Among them, the alternative P-CSCF/SBC has the function of Session-Reflector, and the gateway has the function of Session-Sender.

Specifically, the candidate P-CSCF/SBC may obtain the identifier of the gateway in the Set-Up Response sent by the gateway. The identifier of the gateway may be a number ID or an IP address of the gateway. For example, the ID of the gateway: HWID.

Optionally, the candidate P-CSCF/SBC carries the identifier of the candidate P-CSCF/SBC and the control plane IP configured by itself in the sent Server Start to the gateway. Thus the gateway can send control messages to the alternate P-CSCF/SBC via the control plane IP. Therefore, in the process of establishing a TWAMP link, both the candidate P-CSCF/SBC and the gateway are identified by the peer device.

Step 602: The candidate P-CSCF/SBC receives the user identifier of the user terminal that is sent by the gateway and belongs to the gateway.

Optionally, the candidate P-CSCF/SBC receives the user identifier of the user terminal belonging to the gateway through an IP Information (IP Info) message sent by the gateway. The user identifier of the user terminal may be: the gateway is an IP address assigned by each user terminal that belongs to the gateway.

Optionally, the candidate P-CSCF/SBC may send the configured access side user plane IP address to the gateway through the IP info message, so that the gateway can pass the candidate P-CSCF/SBC user plane IP address and the candidate. The P-CSCF/SBC performs data communication on the service.

Step 603: The candidate P-CSCF/SBC establishes a mapping relationship between the identifier of the gateway and the user identifier of the user terminal that belongs to the gateway.

Specifically, the identifier of the gateway may be an ID of the gateway, and the user identifier may be a user IP address, so that the candidate P-CSCF/SBC records the mapping relationship between the ID of the gateway and the IP address of the user terminal.

Optionally, after the user terminal re-registers to the candidate P-CSCF/SBC, the candidate P-CSCF/SBC identifies the candidate P-CSCF/SBC and registers the candidate The username of the user terminal of the P-CSCF/SBC is sent to the home gateway. Therefore, the home gateway records the mapping relationship between the identifier of the currently registered user terminal and the identifier of the registered P-CSCF/SBC.

Specifically, the candidate P-CSCF/SBC may construct an IMS registration information (IMS register Info) message, where the IMS register Info carries the ID of the candidate P-CSCF/SBC and the identifier of the UE. The identity of the UE may be the IMSI/MSISDN of the UE. The IMS register Info can also carry the IP address of the UE.

If the S-CSCF/IBCF and the P-CSCF disaster recovery backup relationship corresponding to the gateway are different, the S-CSCF selects an alternative P-CSCF, and the candidate P-CSCF may not be able to find the gateway to which the current user terminal belongs. For example, as shown in FIG. 7, there is no mapping relationship between PGW1 and the user IP address on the P-CSCF2. That is, the candidate P-CSCF/SBC cannot determine the home gateway of the user terminal according to the mapping relationship between the pre-established gateway and each user terminal belonging to the gateway, and the candidate P-CSCF/SBC to the S The CSCF sends a failure response message, which is used to indicate that the triggering of the user terminal to re-register to the candidate P-CSCF/SBC fails. Therefore, the disaster tolerance process is not triggered, that is, the user terminal is not triggered to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal. Therefore, the DR backup relationship of the P-CSCF on the network needs to be planned in a unified manner.

The embodiment of the invention further provides a method for realizing recovery of the called service of the terminal. As shown in FIG. 8, the method includes:

Step 801: When the P-CSCF/SBC registered by the user terminal fails, the home gateway of the user terminal receives the candidate P-CSCF/SBC through a TWAMP link with the candidate P-CSCF/SBC. The trigger message is sent to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal.

Step 802: The home gateway queries the P-CSCF registered by the user terminal according to the mapping relationship between the user terminal that registers the candidate P-CSCF/SBC and the candidate P-CSCF/SBC. The SBC is a different P-CSCF/SBC than the candidate P-CSCF/SBC.

Step 803: The home gateway notifies the user terminal to re-register to the candidate P-CSCF/SBC.

Optionally, after the user terminal re-registers to the candidate P-CSCF/SBC, the home gateway receives the candidate P-CSCF/SBC sent by the candidate P-CSCF/SBC An identifier and a user identifier of the user terminal;

Specifically, the candidate P-CSCF/SBC may construct an IMS registration information (IMS register Info) message, where the IMS register Info carries the ID of the candidate P-CSCF/SBC and the identifier of the UE. The identity of the UE may be the IMSI/MSISDN of the UE. The IMS register Info can also carry the IP address of the UE. The alternate P-CSCF/SBC thus transmits the constructed IMS register Info to the home gateway of the user terminal. Therefore, the home gateway establishes a P-CSCF/SBC registered by the user terminal. The mapping relationship with the user terminal.

With the solution provided by the embodiment of the present invention, when the P-CSCF/SBC registered by the user terminal fails, the home gateway of the user terminal receives the standby by using a TWAMP link with the candidate P-CSCF/SBC. The trigger message sent by the P-CSCF/SBC is selected, and the trigger message is used to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal. The home gateway queries the P-CSCF/SBC registered by the user terminal according to the pre-established mapping relationship between the user terminal that registers the candidate P-CSCF/SBC and the candidate P-CSCF/SBC. The alternative P-CSCF/SBC is a different P-CSCF/SBC. The home gateway notifies the user terminal to re-register to the candidate P-CSCF/SBC. Therefore, it is no longer necessary to trigger the PCRF to the gateway to notify the user terminal to re-register the P-CSCF/SBC, which reduces the deployment difficulty, avoids signaling interaction with the PCRF, and reduces signaling overhead.

The embodiments of the present invention are specifically described below in conjunction with specific examples. The UE does not roam, and the P-CSCF and the gateway use the PGW as an example.

First, the control session establishment process between the P-CSCF and the PGW is first described. Here, the control session is established between the P-CSCF and the PGW in the architecture, as shown in FIG.

In step 901, the P-CSCF and the PGW perform Open TCP connection on port 862.

Step 902: The P-CSCF sends a Server Greeting message to the PGW.

In step 903, the PGW sends a Set-Up Response message to the P-CSCF. And the Set-UP Response carries the ID of the PGW. For example, the ID is: HWID.

In step 904, the P-CSCF sends a Server Start message to the PGW. The Server Start carries the ID of the P-CSCF.

After the above four steps, the control session between the P-CSCF and the PGW is successfully established, and the P-CSCF and the PGW mutually save the ID of the other party. And it is a many-to-many relationship.

After the above control session is established, the P-CSCF and the PGW interact with each other to establish a mapping relationship, as shown in FIG.

In step 1001, the PGW sends an IP Info message to the P-CSCF. The IP Info message carries the UE IP address pool information allocated to the UE belonging to the PGW.

In step 1002, the P-CSCF can record the mapping relationship between the current PGW ID and the UE IP address.

Step 1003: The P-CSCF transmits the IP address information of the access side user plane configured by itself to the PGW through an IP Info message.

In step 1004, the PGW records the mapping relationship between the ID of the P-CSCF and the IP address of the user plane.

The following describes the establishment of the mapping relationship between the P-CSCF and the identity of the UE, as shown in FIG. The UE is identified as the IMSI/MSISDN of the UE.

In step 1101, the UE completes registration with the P-CSCF through the S-CSCF.

Step 1102: The P-CSCF sends an IMS register info message to the PGW, where the IMS register info message carries the ID of the P-CSCF, the IP address of the UE, and the IMSI/MSISDN of the UE.

Step 1103: The PGW establishes a mapping relationship between the IMSI/MSISDN of the UE and the ID of the P-CSCF registered by the UE.

The P-CSCF registered by the user terminal fails. The following describes the process of recovering the called service of the terminal. 12 is shown.

Step 1201: The candidate P-CSCF receives the SIP INVITE message sent by the S-CSCF. The SIP INVITE message carries a Restoration-info header field, which includes the IMSI/MSISDN of the user and the IP address of the user.

In step 1202, the registration information of the user is not available on the candidate P-CSCF. Specifically, the candidate P-CSCF determines that the user is not a registered user of the candidate P-CSCF according to the user IP address.

In step 1203, the candidate P-CSCF sends a failure response message to the S-CSCF, for example, 404NOT found.

Step 1204: The candidate P-CSCF determines the ID of the PGW to which the user belongs according to the saved user IP address mapping relationship.

In step 1205, the alternate P-CSCF constructs an IMS register Info message and sends it to the PGW to which the user belongs. The IMS register Info message carries the ID of the candidate P-CSCF, the IMSI/MSISDN of the UE, and the IP address of the UE. The PGW to which the user belongs acquires the ID of the candidate P-CSCF, the IMSI/MSISDN of the UE, and the IP address of the UE.

Step 1206: The PGW to which the user belongs is queried according to the IMSI/MSISDN of the UE, and the UE currently registers the P-CSCF. It is determined that the queried P-CSCF is different from the obtained P-CSCF.

Step 1207: The PGW to which the user belongs informs the UE to perform an IMS re-registration process. The UE is caused to update the IP address of the P-CSCF to be the IP address of the candidate P-CSCF.

Step 1208: After the UE re-registers successfully, the S-CSCF obtains the IP address of the new P-CSCF, and then connects the UE's call according to the configuration.

FIG. 13 is a schematic structural diagram of an apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present invention, where the apparatus is implemented by an alternative P-CSCF/SBC. The apparatus includes a communication interface 1301, a processor 1302, and a memory 1303. The communication interface 1301, the processor 1302, and the memory 1303 are connected to each other. The specific connecting medium between the above components is not limited in the embodiment of the present invention. The embodiment of the present invention is connected in FIG. 13 between the memory 1303, the processor 1302, and the communication interface 1301 via a bus 1304. The bus is indicated by a thick line in FIG. 13, and the connection manner between other components is merely illustrative. , not limited to. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 13, but it does not mean that there is only one bus or one type of bus.

The communication interface 1301 in the embodiment of the present invention is used for transmitting and receiving information.

In the embodiment of the present invention, the memory 1303 is configured to store the program code executed by the processor 1302, and may be a volatile memory (English: volati le memory), such as random access memory (English: random-access memory, abbreviation: RAM) The memory 1303 can also be a non-volatile memory (English: non-volatile memory), such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: Hard disk drive (HDD) or solid state drive (English: solid-state drive, SSD), or memory 1303 can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer. Any other media taken, but not limited to this. The memory 1303 may be a combination of the above memories.

The processor 1302 in the embodiment of the present invention may be a central processing unit (English: central processing unit, CPU for short). The processor 1302 is configured to execute program code stored in the memory, and is used to execute the embodiment corresponding to FIG. The method for realizing recovery of the called service of the terminal is as follows:

Receiving a request message sent by the S-CSCF; the request message is generated by the communication interface 1301 when the P-CSCF/SBC registered by the user terminal corresponding to the received called request fails; the request message is used for The indication triggers the user terminal to re-register to the device.

The memory 1303 further stores a mapping relationship between the pre-established gateway and each user terminal that belongs to the gateway.

The processor 1302 determines the home gateway of the user terminal according to the mapping relationship stored by the memory 1303.

And sending a trigger message to the home gateway by using a two-way active measurement protocol TWAMP link with the home gateway, where the trigger message is used to trigger the user terminal to re-register to the device to carry the user terminal. Called business.

After the user terminal re-registers to the device, the identifier of the device and the user name of the user terminal that registers the device are sent to the home gateway.

The username may be an International Mobile Subscriber Identity (IMSI) or a subscriber number.

The process of establishing a link relationship will be described below.

The processor 1302 acquires the identifier of the gateway during the establishment of the TWAMP link with the gateway, and receives the user identifier of the user terminal that is sent by the gateway and belongs to the gateway. The processor 1302 then establishes a mapping relationship between the identifier of the gateway and the user identifier of the user terminal belonging to the gateway, and stores the established mapping relationship in the memory 1303.

The user identifier of the user terminal is: the gateway is an Internet Protocol IP address assigned to each user terminal that belongs to the gateway. The identifier of the gateway is a device number ID or an IP address of the gateway.

When the processor 1302 cannot determine the home gateway of the user terminal according to the mapping relationship between the pre-established gateway and each user terminal that belongs to the gateway, the processor 1302 sends a failure response message to the S-CSCF, where the failure response message is sent. The instruction to trigger the user terminal to re-register to the device fails.

FIG. 14 is a schematic structural diagram of an apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present invention, where the apparatus is implemented by a gateway. The apparatus includes a communication interface 1401, a processor 1402, and a memory 1403. The communication interface 1401, the processor 1402, and the memory 1403 are connected to each other. The specific connecting medium between the above components is not limited in the embodiment of the present invention. The embodiment of the present invention is connected in FIG. 13 between the memory 1403, the processor 1402, and the communication interface 1401 via a bus 1404. The bus is indicated by a thick line in FIG. 13, and the connection manner between other components is merely illustrative. , not limited to. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 13, but it does not mean that there is only one bus or one type of bus.

The communication interface 1401 in the embodiment of the present invention is used for transmitting and receiving information.

In the embodiment of the present invention, the memory 1403 is configured to store the program code executed by the processor 1402, and may be a volatile memory, such as a random access memory (English: random-access memory, abbreviation: RAM); The memory 1403 may also be a non-volatile memory (English: non-volatile memory), such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard Disk drive, abbreviated: HDD) or solid state drive (English: solid-state drive, SSD), or memory 1403 can be used to carry or store desired program code in the form of an instruction or data structure and can be accessed by a computer. Any other medium, but not limited to this. The memory 1403 may be a combination of the above memories.

The processor 1402 in the embodiment of the present invention may be a central processing unit (CPU). The processor 1402 is configured to execute the program code stored in the memory, and the method for implementing the terminal called service recovery described in the embodiment corresponding to FIG. 8 is as follows:

When the proxy call session control function entity P-CSCF/SBC registered by the user terminal fails, the candidate P-CSCF/SBC is received through the bidirectional active measurement protocol TWAMP link with the candidate P-CSCF/SBC. The trigger message is sent to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal.

Querying, according to a pre-established mapping relationship between the user terminal of the candidate P-CSCF/SBC and the candidate P-CSCF/SBC, the P-CSCF/SBC registered by the user terminal and the candidate P- CSCF/SBC is a different P-CSCF/SBC.

The user terminal is notified to re-register to the candidate P-CSCF/SBC.

Optionally, after the user terminal re-registers to the candidate P-CSCF/SBC, receiving an identifier of the candidate P-CSCF/SBC sent by the candidate P-CSCF/SBC and the user The user identifier of the terminal is then recorded according to the identifier of the candidate P-CSCF/SBC and the user identifier of the user terminal, and the mapping relationship between the candidate P-CSCF/SBC and the user terminal is recorded.

Referring to FIG. 15, which is an apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present invention, where the apparatus is implemented by an alternative P-CSCF/SBC, including:

The receiving unit 1501 is configured to receive a request message sent by the serving call session control function entity S-CSCF, where the request message is generated by the receiving unit in the P-CSCF/SBC registered by the user terminal corresponding to the received called request. The request message is used to indicate that the user terminal is triggered to re-register to the device;

The processing unit 1502 is configured to determine, according to a mapping relationship between the pre-established gateway and each user terminal that belongs to the gateway, a home gateway of the user terminal;

The sending unit 1503 is configured to send a trigger message to the home gateway by using a bidirectional active measurement protocol TWAMP link with the home gateway, where the trigger message is used to trigger the user terminal to re-register to the device to carry The called service of the user terminal.

The sending unit 1503 is further configured to:

The user name is an International Mobile Subscriber Identity (IMSI) or a subscriber number.

The device also includes:

An obtaining unit 1504, configured to acquire an identifier of the gateway during establishing a TWAMP link with the gateway;

The receiving unit 1501 is further configured to receive a user identifier of the user terminal that is sent by the gateway, and the processing unit is further configured to establish an identifier of the gateway and a user that belongs to the gateway. Mapping relationship of the user ID of the terminal.

The user identifier of the user terminal may be: the gateway is an Internet Protocol IP address assigned to each user terminal that belongs to the gateway. The identifier of the gateway may be a device number ID or an IP address of the gateway.

The sending unit 1503 is further configured to send a failure to the S-CSCF, when the processing unit 1502 cannot determine the home gateway of the user terminal according to the mapping relationship between the pre-established gateway and each user terminal that belongs to the gateway. In response to the message, the failure response message is used to indicate that the triggering of the user terminal to re-register to the device fails.

Referring to FIG. 16, an apparatus for implementing recovery of a called service of a terminal according to an embodiment of the present invention is provided by a user. The home gateway implementation of the terminal includes:

The receiving unit 1601 is configured to receive, by the bidirectional active measurement protocol TWAMP link between the candidate P-CSCF/SBC, when the proxy call session control function entity P-CSCF/SBC registered by the user terminal fails. The trigger message sent by the P-CSCF/SBC is selected, and the trigger message is used to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal.

The querying unit 1602 is configured to query, according to a pre-established mapping relationship between the user terminal that registers the candidate P-CSCF/SBC and the candidate P-CSCF/SBC, the P-CSCF/SBC registered by the user terminal. The alternative P-CSCF/SBC is a different P-CSCF/SBC.

The notification unit 1603 is configured to notify the user terminal to re-register to the candidate P-CSCF/SBC.

The receiving unit 1601 is further configured to: after the user terminal re-registers to the candidate P-CSCF/SBC, receive the candidate P-CSCF/SBC sent by the candidate P-CSCF/SBC The identifier and the user identifier of the user terminal.

The device further includes: a recording unit 1604, configured to record, according to the identifier of the candidate P-CSCF/SBC and the user identifier of the user terminal, a mapping of the candidate P-CSCF/SBC to the user terminal relationship.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The device is implemented in one or more flow charts and/or block diagrams in a block or blocks. The function is fixed.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A method for realizing recovery of a called service of a terminal, comprising:

The alternate proxy call session control function entity P-CSCF/session border controller SBC receives the request message sent by the serving call session control function entity S-CSCF; the request message is that the S-CSCF corresponds to the received called request The P-CSCF/SBC registered by the user terminal is generated when the fault occurs; the request message is used to indicate that the user terminal is triggered to re-register to the candidate P-CSCF/SBC;

Determining, by the P-CSCF/SBC, the home gateway of the user terminal according to a mapping relationship between the pre-established gateway and each user terminal belonging to the gateway;

The candidate P-CSCF/SBC sends a trigger message to the home gateway through a bidirectional active measurement protocol TWAMP link with the home gateway, the trigger message is used to trigger the user terminal to re-register to the The alternative P-CSCF/SBC is to carry the called service of the user terminal.
The method of claim 1 further comprising:

After the user terminal re-registers to the candidate P-CSCF/SBC, the candidate P-CSCF/SBC identifies the candidate P-CSCF/SBC and registers the candidate P-CSCF/ The username of the user terminal of the SBC is sent to the home gateway.
The method of claim 2 wherein said user name is an International Mobile Subscriber Identity (IMSI) or a subscriber number.
The method of any of claims 1-3, wherein the establishing the mapping relationship comprises:

Obtaining an identifier of the gateway during establishing a TWAMP link with the gateway;

Receiving, by the gateway, a user identifier of a user terminal that belongs to the gateway;

Establishing a mapping relationship between the identifier of the gateway and the user identifier of the user terminal that belongs to the gateway.
The method of claim 4, wherein the user identifier of the user terminal is: the gateway is an Internet Protocol IP address assigned to each user terminal belonging to the gateway.
The method according to any one of claims 1-5, wherein the identifier of the gateway is a device number ID or an IP address of the gateway.
The method of any of claims 1-6, further comprising:

When the candidate P-CSCF/SBC cannot determine the home gateway of the user terminal according to the mapping relationship between the pre-established gateway and each user terminal belonging to the gateway, the candidate P-CSCF/SBC to the S The CSCF sends a failure response message, which is used to indicate that the triggering of the user terminal to re-register to the candidate P-CSCF/SBC fails.
A method for realizing recovery of a called service of a terminal, comprising:

When the proxy call session control function entity P-CSCF/SBC registered by the user terminal fails, the home gateway of the user terminal receives the TWAMP link through a bidirectional active measurement protocol with the alternate P-CSCF/SBC. a trigger message sent by the candidate P-CSCF/SBC, the trigger message is used to trigger the user terminal to re-register to the candidate a P-CSCF/SBC to carry the called service of the user terminal;

Querying, by the home gateway, the P-CSCF/SBC registered by the user terminal according to a pre-established mapping relationship between the user terminal that registers the candidate P-CSCF/SBC and the candidate P-CSCF/SBC The alternative P-CSCF/SBC is a different P-CSCF/SBC;

The home gateway notifies the user terminal to re-register to the candidate P-CSCF/SBC.
The method of claim 8 further comprising:

After the user terminal re-registers to the candidate P-CSCF/SBC, the home gateway receives the identifier of the candidate P-CSCF/SBC sent by the candidate P-CSCF/SBC and the User ID of the user terminal;

The home gateway records the mapping relationship between the candidate P-CSCF/SBC and the user terminal according to the identifier of the candidate P-CSCF/SBC and the user identifier of the user terminal.
An apparatus for implementing recovery of a terminal called service, wherein the apparatus is implemented by an alternate proxy call session control function entity P-CSCF/Session Border Controller SBC, including:

a receiving unit, configured to receive a request message sent by the serving call session control function entity S-CSCF; the request message is that the receiving unit fails in the P-CSCF/SBC registered by the user terminal corresponding to the received called request The request message is used to indicate that the user terminal is triggered to re-register to the device;

a processing unit, configured to: when the receiving unit receives the request message, determine a home gateway of the user terminal according to a mapping relationship between a pre-established gateway and each user terminal that belongs to the gateway;

a sending unit, configured to send a trigger message to the home gateway determined by the processing unit by using a bidirectional active measurement protocol TWAMP link with the home gateway, where the trigger message is used to trigger the user terminal to re-register to The device is configured to carry the called service of the user terminal.
The device according to claim 10, wherein the sending unit is further configured to:

After the user terminal re-registers to the device, the identifier of the device and the user name of the user terminal that registers the device are sent to the home gateway determined by the processor unit.
The apparatus of claim 11 wherein said user name is an International Mobile Subscriber Identity (IMSI) or a subscriber number.
The device of any of claims 10-12, further comprising:

An obtaining unit, configured to acquire an identifier of the gateway during establishing a TWAMP link with the gateway;

The receiving unit is further configured to receive a user identifier of the user terminal that is sent by the gateway and belongs to the gateway;

The processing unit is further configured to establish a mapping relationship between the identifier of the gateway and a user identifier of a user terminal that belongs to the gateway.
The device of claim 13, wherein the user identifier of the user terminal is: the gateway is an Internet Protocol IP address assigned to each user terminal belonging to the gateway.
The device according to any one of claims 10-14, wherein the identifier of the gateway is a device number ID or an IP address of the gateway.
The device according to any one of claims 10-15, wherein, when the processing unit cannot determine the home gateway of the user terminal according to a mapping relationship between the pre-established gateway and each user terminal belonging to the gateway, The sending unit is further configured to send a failure response message to the S-CSCF, where the failure response message is used to indicate that the user terminal is triggered to re-register to the device.
An apparatus for implementing recovery of a called service of a terminal, where the apparatus is implemented by a home gateway of a user terminal, including:

a receiving unit, configured to receive the candidate by a bidirectional active measurement protocol TWAMP link between the candidate P-CSCF/SBC when the proxy call session control function entity P-CSCF/SBC registered by the user terminal fails a trigger message sent by the P-CSCF/SBC, the trigger message is used to trigger the user terminal to re-register to the candidate P-CSCF/SBC to carry the called service of the user terminal;

a querying unit, configured to query, according to a pre-established mapping relationship between the user terminal that registers the candidate P-CSCF/SBC and the candidate P-CSCF/SBC, the P-CSCF/SBC registered by the user terminal The alternative P-CSCF/SBC is a different P-CSCF/SBC;

And a notification unit, configured to notify the user terminal to re-register to the candidate P-CSCF/SBC.
The apparatus according to claim 17, wherein the receiving unit is further configured to: after the user terminal re-registers to the candidate P-CSCF/SBC, receive the candidate P-CSCF/SBC The identifier of the candidate P-CSCF/SBC sent and the user identifier of the user terminal;

The device also includes:

a recording unit, configured to record a mapping between the candidate P-CSCF/SBC and the user terminal according to the identifier of the candidate P-CSCF/SBC and the user identifier of the user terminal received by the receiving unit relationship.