WO2013083004A1

WO2013083004A1 - Method and device for realizing service continuity during media plane update process

Info

Publication number: WO2013083004A1
Application number: PCT/CN2012/085193
Authority: WO
Inventors: 周晓云; 宗在峰; 李振东; 谢振华
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-12-08
Filing date: 2012-11-23
Publication date: 2013-06-13
Also published as: CN103167462B; CN103167462A

Abstract

Disclosed is a method for realizing service continuity during a media plane update process, including: when accessing an irrelevant communication network based on Internet Protocol (IP), during an IP address and/or port number update process of a media plane, a call termination side gateway (P-GW) simultaneously opens a port number of a call termination side terminal before and after update before the call origination side completes the corresponding bearer update, and after the call origination side completes the corresponding bearer update, a call termination gateway closes the port number of the call termination side terminal before update again. Also disclosed is a device for realizing service continuity during a media plane update process. The present invention can be applied to solve the technical problem that the downlink media data is interrupted during the media plane update process.

Description

Method and device for realizing business continuity in media surface update process

The present invention relates to the field of communications, and more particularly to a method and apparatus for implementing service continuity in a media plane update process. Background technique

Access-independent Internet Protocol (IP)-based communication networks include Next Generation Network (GN), IP Multimedia Core Subsystem (IMS), and Web-based Real-Time Communication Network (RTCWeb). Real Time Communication on Web), the network provides users with business capabilities, including real-time communication services such as voice communication and video communication, and belongs to the business network category. The access network includes circuit CS domain access and packet PS domain access. The CS domain access network includes Global System of Mobile Communication (GSM), Code Division Multiple Access (CDMA), and other networks such as Code Division Multiple Access (CDMA). The PS domain access includes Long Term Evolution (LTE), High-Speed Packet Access (HSPA), Enhanced Data Rate for GSM Evolution (EDGE), and Evolution Data. (EVDO, Evolution, Data Only) and other networks.

During the progress of the service, the media plane needs to be updated due to the movement of the user equipment (UE, User Equipment) or the update of the service. Both parties of the communication need to update the media plane through the IP Multimedia System (IMS, IP Multimedia Subsystem) signaling. In the process of updating, the ongoing media communication may be interrupted, affecting the user experience.

Figure 1 is a flow chart of updating the port number of the media face and realizing service continuity during the course of the service, which is described as follows:

Step 101: UE-1 calls the session control function (P-CSCF, Proxy-Call Session) Control Function 1 sends an IMS update message, SDP (Session Description Protocol) offer, to inform the media side that the port number received from port (Portl) 1 is changed to Portl2. P-CSCF1 further forwards the message to the proxy P-CSCF2;

Step 102: The P-CSCF2 further forwards the message to the UE-2.

Step 103: UE-2 returns an IMS OK message (ie, SDP Answer, also called a response message) to P-CSCF2 to notify its port number to be changed from Port 21 to Port 22;

Step 104: The P-CSCF2 provides the updated service information to the Policy and Charging Rules Function (PCRF), and carries the updated media information, and the updated port number Portl 2, Port22;

Step 105: The PCRF2 provides an updated policy and charging control (PCC) rule to the terminating gateway packet gateway (P-GW, Packet Gateway) 2, where the PCC rule carries the updated flow description information Portl2 and Port22;

Step 106: P-GW2 initiates a bearer modification process, and notifies the updated flow description information to

UE2;

Thereafter, P-GW2 will not allow the destination IP address to be the IP address (Address) 11, the destination port number Portl 1 as the uplink data, and the destination address to be IP Address 21, and the destination port number to be the downstream data of Port 22.

Step 107: UE2 sends media information to IPAddress1 and Port 12 by using IPAddress21 and Port22.

Step 108: The P-CSCF2 returns an IMS OK message to the P-CSCF1, and the port number of the UE2 is changed from Port 21 to Port 22;

Steps 108 and 104 are performed simultaneously.

Step 109: The P-CSCF2 returns an IMS OK message to the UE1, carrying the new port number Port22 of the UE2;

Step 110: The P-CSCF1 provides the updated service information to the PCRF1, and carries the updated media plane information, and the updated port number Portl2, Port22; Step 109 and step 110 are performed simultaneously.

Step 111: The PCRF1 provides the updated PCC rule to the P-GW1, where the PCC rule carries the new flow description information Portl2 and Port22;

Step 112: P-GW1 initiates a bearer modification process, and notifies UE1 of the updated flow description information.

Thereafter, P-GW1 will not allow the destination address to be IP Addressll, the destination port number Portll downlink data, and the destination address to be IPAddress21, and the destination port number to be Port21's upstream data.

In the above process, at step 105, since P-GW2 has changed Portl2 to Port22, the downlink data of Portl2 cannot reach UE2 at this time. The UE1 does not know the new port number of the UE2 until step 109, so the data sent by the UE 1 to the UE2 in the time interval from step 105 to step 109 will be discarded. When the cross-domain is considered, the IMS signaling delay is large, resulting in a large number of discarded data packets, causing service interruption and affecting the user experience.

In other scenarios, for example, UE1 updates the IP address, or UE1 updates the IP address and port number at the same time, and data service interruption occurs. Summary of the invention

In view of this, the main object of the present invention is to provide a method and system for implementing service continuity in a media plane update process, which is used to solve the technical problem of downlink media data interruption in the process of media surface update.

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

A method for implementing service continuity in a media plane update process, the method comprising: in an update process of an IP address and/or a port number of a media plane when accessing an unrelated IP-based communication network, the terminal side P - The GW opens the port number before and after the update of the terminating terminal before the corresponding bearer update is completed on the calling side. After the calling side completes the corresponding update, the terminating side gateway closes the update of the terminating terminal. Port number. Further, the step of the terminal-side P-GW opening the port number before and after the update of the terminal-side terminal before the completion of the corresponding bearer update on the calling side is specifically:

After the terminal-side proxy call session control function P-CSCF receives the response message of the terminal-side terminal notification to update the media port number, the terminal-side policy charging rule function PCRF provides the service information carrying the new flow description information;

The terminating side PCRF instructs the terminating side P-GW to open a new port;

The P-GW of the terminating side allows the destination port to be the downlink service data flow of the port number before and after the update of the terminating terminal, or the source port is the uplink service data flow of the port number before and after the update of the terminating terminal. by.

Further, after the caller side completes the corresponding bearer update, the step of the terminal-side P-GW re-closing the pre-update port number of the terminal-side terminal is specifically:

After receiving the acknowledgement message fed back by the calling side P-CSCF, the terminal-side P-CSCF sends the service information carrying the port number before the terminal-end terminal update is deleted to the terminal-side PCRF;

The terminal-side PCRF indicates that the terminal-side P-GW closes the port number before the terminal-side terminal is updated, and the terminal-side P-GW only allows the destination port to be the downlink service data of the port number after the terminal-side terminal is updated. The flow, or source port is the uplink service data flow of the port number updated by the terminating terminal.

When the terminating side P-GW opens a new port according to the indication of the terminal side PCRF, the terminating side

P-GW starts the delay timer;

During the timeout period of the delay timer, the terminating side P-GW allows the destination port to be the downlink service data stream of the port number before and after the update of the terminating terminal, or the source port is the pre-update of the terminating terminal. The uplink service data flow of the updated port number is passed;

After the delay timer expires, the terminating side P-GW closes the terminal before the terminal end side update. Slogan.

The terminal-side P-GW detects whether the service data stream with the new port number of the terminating-end terminal is received as the destination port, and when the service data stream with the new port number as the destination port is detected, the terminating side

The P-GW turns off the port number before the update of the terminating side terminal.

When the terminating side PCRF indicates that the terminating side gateway opens a new port, the terminating side PCRF starts a delay timer;

After the delay timer expires, the terminating side PCRF instructs the terminal-side P-GW to close the port number before the terminal-side terminal is updated.

Further, the method for the terminal-side PCRF to instruct the terminal-side P-GW to open a new port is specifically: the updated policy charging and controlling PCC rules provided by the terminal-side PCRF to the term-side gateway ;

The PCC rule includes flow description information of the updated port number.

Further, the method for the terminal-side PCRF to indicate that the terminal-side gateway closes the port number before the terminal-side terminal is updated is specifically: the updated PCC rule provided by the terminal-side PCRF to the terminal-side gateway Wherein the PCC rule does not include flow description information of the port number before the update.

The present invention also provides a system for implementing service continuity in a media plane update process, the system being applied to an IP address and/or port number update process of a media plane in an access-independent IP-based communication network, the system comprising: a terminating side P-GW, a terminating side PCRF, and a terminating side P-CSCF; wherein

The terminal-side P-CSCF is configured to: after receiving the response message of the terminal-side terminal to update the media port number, provide the service information carrying the new flow description information to the terminal-side PCRF; The terminal-side PCRF is configured to: after receiving the service information sent by the P-CSCF on the terminating side, instruct the terminal-side P-GW to open a new port;

The terminal-side P-GW is configured to receive the indication that the terminal-side PCRF sends a new port, and before the call-side completes the corresponding update, and allows the destination port to be the pre-update terminal and the updated terminal. The downlink service data flow of the port number, or the uplink service data flow of the port number before and after the update of the source port is updated; and after the corresponding bearer update is completed on the originating side, the update of the terminal end terminal is closed. The previous port number.

Further, the terminating side P-CSCF is further configured to: after receiving the acknowledgement message fed back by the calling side P-CSCF, send, to the terminating side PCRF, the service information carrying the port number before the terminal of the terminal device is updated. ;

The terminal-side PCRF is further configured to instruct the terminal-side P-GW to close a port number before the terminal-side terminal is updated;

The terminating side P-GW is further configured to: after the port number before the terminal end of the terminal is updated, the destination port is allowed to be the downlink service of the port number after the terminal of the terminal is updated. The data stream or the source port is the uplink service data stream of the port number updated by the terminating side terminal.

Further, the terminating side P-GW is further configured to start a delay timer when the new port is opened according to the indication of the terminal call side PCRF; during the timeout period of the delay timer, the destination port is allowed to be The downlink service data flow of the port number before and after the update of the terminating terminal, or the uplink service data flow of the port number before and after the update of the source port is updated; after the delay timer expires , Close the port number before the terminal of the terminal is updated.

Further, the terminating side P-GW is further configured to detect whether a service data flow with the new port number of the terminating terminal is received as the destination port, and when the service data stream with the new port number as the destination port is detected, Close the port number before the update of the terminating terminal.

The present invention also provides a P-GW, where the P-GW includes: a management module, configured to access In an unrelated IP-based communication network, during the update process of the IP address and/or port number of the media side, before the calling side completes the corresponding bearer update, the port number before and after the update of the terminal-side terminal is simultaneously opened. After the call side completes the corresponding update, the port number before the update of the terminal side terminal is closed.

Further, the management module is specifically configured to: after receiving the indication of opening a new port sent by the terminal-side PCRF, and allowing the destination port to be a downlink service data flow before and after the terminal-end terminal update, Or the source port is the uplink service data flow of the port number before and after the update of the terminating terminal.

Further, the management module is specifically configured to: after receiving the indication of deleting the new port sent by the terminal-side PCRF, close the port number before the terminal-end terminal is updated, and only allow the destination port to be updated after the terminal-side terminal is updated. The downlink service data flow of the port number or the uplink service data flow whose source port is the port number after the terminal of the terminal is updated.

Further, the P-GW further includes: a timing module, configured to receive a notification start delay timer sent by the management module, and notify the management module that the delay timer expires when the delay timer expires;

Correspondingly, the management module is further configured to: when the new port is opened according to the indication of the terminal call side PCRF, notify the timing module to start a delay timer, where the destination port is allowed to be within the timeout period of the delay timer The downlink service data flow of the port number before and after the update of the terminating terminal, or the uplink service data flow of the port number before and after the update of the source port is updated after the delay timer expires. , Close the port number before the terminal of the terminal is updated.

Further, the P-GW further includes: a detecting module, configured to detect whether a service data flow with the new port number of the terminal end terminal as the destination port is received, and when the service data with the new port number as the destination port is detected In the case of the flow, the notification management module closes the port number before the update of the terminating terminal. Correspondingly, the management module is further configured to close the port number before the update of the terminating terminal according to the notification sent by the detecting module. In the media surface update process, the terminal-side gateway simultaneously opens the port number before and after the update of the terminal-side terminal. When the update process is completed, the terminal-side gateway closes the port number before the update of the terminal-side terminal, thereby avoiding The interruption of the downlink media data during the media update process improves the data transmission efficiency and improves the user experience. DRAWINGS

1 is a flow chart for implementing business continuity in an existing media plane update process; FIG. 1 is a flowchart of Embodiment 1 of the present invention;

Figure 3 is a flow chart of Embodiment 1 of the present invention;

Figure 4 is a flow chart of Embodiment 3 of the present invention;

Figure 5 is a flow chart of Embodiment 4 of the present invention;

Figure 6 is a flow chart of Embodiment 5 of the present invention;

Figure 7 is a flow chart showing Embodiment 6 of the present invention. detailed description

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

Example 1

FIG. 2 is a flow chart of updating the port number of the media surface and realizing business continuity during the process of the service according to the present invention, and the description thereof is as follows:

The calling side terminal UE1 and the terminating side terminal UE2 communicate, and the media plane address and port number are as follows: the calling side terminal receiving address Addressll, the port number Portll, the terminating side terminal receiving address Address21, the port number Port21. At some point, UE1 decides to change the media plane receiving port number to Portl2.

Step 201: The P-CSCF receives the IMS update message, that is, the SDP offer (SDP offer) message, and the calling side terminal UE1 requests to change the media plane receiving port number, and changes from Portll to Portl2; Generally, traffic description information of one or more service data flows may be included in the service information. The receiving port number and the sending port number are the same.

Step 202: The P-CSCF forwards the message to UE2.

Step 203: The UE2 returns an IMS OK message to the P-CSCF, that is, the SDP Answer, also called the response message, notifying the peer UE2 that the media plane receiving port number is changed from Port 21 to Port 22; Step 204: The P-CSCF provides the service information to the PCRF. , carrying a new flow description information, Port 11 changed to Portl2, port21 changed to Port22;

Step 205: The PCRF sends a PCC rule providing message to the terminating side gateway (P-GW), which carries the updated port Port22, and updates the PCC rule, that is, adds the receiving port of the UE2 in the flow description information of the PCC rule corresponding to the service information. Port22.

Step 206: The P-GW performs the corresponding bearer modification operation according to the updated PCC rule. After that, the P-GW will simultaneously allow the downlink service data flow of the destination port to be the port 21 and the port 22, or the source port number is the uplink service data of the port 21 and the port 22. Flow through.

Step 207: UE2 uses IPAddress21, and Port22 sends data to Address1 and Portl2 of UE1.

Step 208: The P-CSCF forwards the IMS OK message to the proxy call session control function on the calling side, where the new port number Port22 of the UE2 is carried;

Step 204 and step 208 are synchronized.

Step 209: The P-CSCF receives an IMS ACK message (also referred to as an acknowledgement message) sent by the P-CSCF on the originating side;

Step 210: The P-CSCF forwards the IMS ACK message to the UE2.

Step 211: The P-CSCF provides service information to the PCRF, and notifies the PCRF to delete the original received port Port21 of the UE2;

Step 212: The PCRF provides an updated PCC rule to the PCEF, that is, the receiving port Port21 of the UE2 is deleted in the flow description information of the PCC rule corresponding to the service data flow, and is sent to the P-GW. Sending a PCC rule providing message carrying the information of the receiving port Port 21 of the UE2; Step 213: The P-GW performs a corresponding bearer modification operation according to the updated PCC rule. After that, the P-GW will not allow the destination port to be the downlink service data flow of Port 21 or the source service port number of Port 21 to pass the uplink service data flow.

Example 2

FIG. 3 is a flow chart of updating the port number of the media plane and realizing business continuity during the process of the service according to the present invention, and the description thereof is as follows:

Steps 301 through 306 are the same as steps 201 through 206.

Step 307: The P-GW starts a delay timer, and the timing duration of the delay timer depends on the network configuration.

Step 308: UE2 uses IPAddress2, and Port22 sends data to Address1 and Portl2 of UE1.

Step 309: The P-CSCF forwards the IMS OK message.

Step 304 and step 309 are synchronized.

Step 310: The delay timer started in step 307 expires, and the P-GW deletes the receiving port Port21 of the UE2 from the flow description information of the PCC rule corresponding to the service data flow;

After that, the P-GW will not allow the destination service port to be the downlink service data flow of Port 21 or the uplink service data flow whose source port number is Port 21.

In other embodiments, when the PCRF provides the PCC rule to the P-GW in step 305, the P-GW starts the delay timer (the timing of the delay timer depends on the network configuration), when the delayed timer is started At the time, the PCRF provides updated PCC rules to the P-GW, where the updated PCC The rule does not include the flow description information of the port number before the terminal of the terminal is updated, but only the flow description information of the port number after the terminal of the terminal is updated (ie, the PCRF indicates the port number before the P-GW closes the terminal of the terminal. ). The P-GW performs a bearer operation.

Example 3

Step 401 - Step 408 is the same as step 201 - step 208.

Step 409: The P-GW detects the service data flow whose destination port number is Port22, and the P-GW deletes the receiving port Port21 of the UE2 from the flow description information of the PCC rule corresponding to the service data flow;

Example 4

FIG. 5 is a flow chart of updating the IP address of the media plane and realizing business continuity during the progress of the service according to the present invention, and the description thereof is as follows:

The calling side terminal UE1 and the terminating side terminal UE2 communicate, and the media plane address and port number are as follows: the calling side terminal receiving address Addressll, the port number Portll, the terminating side terminal receiving address Address21, the port number Port21. At some point, UE1 decides to change the address of the media plane to Address 12 and the receiving port number to Portl2.

Step 501: The P-CSCF receives the IMS update message, that is, the SDP offer, and the calling side terminal UE1 requests to change the address of the media plane from Addressll to Addressl2, and changes the receiving port number from Portl1. Change to Portl2;

Step 502: The P-CSCF forwards the message to the UE2.

Step 503: UE2 returns an IMS OK message to the P-CSCF, that is, SDP Answer, notifying that the media plane receiving port number of the UE2 is changed from Port21 to Port22;

Step 504: The P-CSCF provides service information to the PCRF, where the new flow description information is carried.

Address 11 is changed to Addressl 2, Portll is changed to Portl2, Port21 is changed to Port22; Step 505-Step 511 is the same as Step 205-Step 211.

Example 5

6 is a flow chart of updating the IP address of the media plane and realizing business continuity during the progress of the service according to the present invention, which is described as follows:

The calling side terminal UE1 and the terminating side terminal UE2 communicate, and the media plane address and port number are as follows: the calling side terminal receiving address Addressl 1 , the port number Portll , the terminating side terminal receiving address Address 21 , the port number Port 21 . At some point, UE1 decides to change the address of the media plane to Address 12 and the receiving port number to Portl2.

Steps 601 to 604 are the same as steps 501 to 504;

Steps 605 through 610 are the same as steps 305 through 310.

In other embodiments, when the PCRF provides the PCC rule to the P-GW in step 605, the P-GW starts the delay timer (the timing of the delay timer depends on the network configuration), when the delayed timer is started The PCRF provides an updated PCC rule to the P-GW, where the updated PCC rule does not include the flow description information of the port number before the terminal of the terminal is updated, but only the flow description of the port number after the terminal of the terminal is updated. Information (ie, the PCRF indicates that the P-GW closes the port number before the terminal of the terminal-side terminal is updated). The P-GW performs a bearer operation.

Example 6

FIG. 7 is a flow chart of updating the IP address of the media plane and realizing business continuity during the process of the service according to the present invention, and the description thereof is as follows: The calling side terminal UE1 and the terminating side terminal UE2 communicate, and the media plane address and port number are as follows: the calling side terminal receiving address Addressll, the port number Portll, the terminating side terminal receiving address Address21, and the port number Port21. At some point, UE1 decides to change the address of the media plane to Address 12 and the receiving port number to Portl2.

Step 701 to step 704 are the same as steps 501 to 504;

Steps 705 to 709 are the same as steps 405 to 409.

In all the above embodiments, the terminating side access network system uses an EPS (Evolved Packet System) as an example. Since the IMS is independent of access, the access network system can be any packet system (such as GPRS (General Packet Radio System), UMTS (Universal Mobile Telecommunications System). The P-GW in the example may also be another packet data gateway (such as a GGSN (GRPS Gateway Supporting Node), a PDG (Packet Data Gateway), or the like).

The present invention provides a system for implementing service continuity in a media plane update process, which is applied to an IP address and/or port number update process of a media plane in an access-independent IP-based communication network, including: a side P-GW, a terminating side PCRF, and a terminating side P-CSCF; wherein, the terminating side P-CSCF is configured to: after receiving the response message of the terminal side terminal to update the media port number, to the terminating side The PCRF provides service information carrying new flow description information;

a terminal call side PCRF, configured to indicate that the terminal side P-GW opens a new port;

The terminating side P-GW is configured to allow the destination port to be the downlink service data flow before and after the update of the terminal number of the terminating terminal, or the source port is the terminating side before completing the corresponding loading update on the calling side. The uplink service data flow of the port number before and after the update of the terminal is passed; and after the corresponding bearer update is completed on the originating side, the port number before the update of the terminal side terminal is closed.

The terminal-side P-CSCF is further configured to: after receiving the acknowledgement message fed back by the calling-side P-CSCF, send the service information carrying the port number before the terminal-end terminal update is deleted to the terminal-side PCRF; The terminal-side PCRF is further configured to instruct the terminal-side P-GW to close a port number before the terminal-side terminal is updated;

After the terminal number of the terminal-side terminal is updated, the terminal-side P-GW only allows the destination port to be the downlink service data stream of the port number after the terminal-side terminal is updated, or the source port is the terminal-side terminal after the terminal is updated. The upstream traffic of the port number passes.

The terminating side P-GW is further configured to: when a new port is opened according to the indication of the terminal call side PCRF, start a delay timer; during the timeout period of the delay timer, allow the destination port to be the terminating side The downlink service data flow of the port number before and after the update of the terminal, or the uplink service data flow of the port number before and after the update of the source port is updated; after the delay timer expires, the terminal is closed. The port number before the caller terminal is updated.

The P-GW of the terminating side is further configured to detect whether the service data flow with the new port number of the terminating terminal is received as the destination port, and when the service data flow with the new port number as the destination port is detected, the terminal call is closed. The port number before the update of the side terminal.

The P-GW includes: a management module, configured to update, during an access-independent IP-based communication network, an IP address and/or a port number of the media plane, before the calling side completes the corresponding bearer update, At the same time, the port number before and after the update of the terminal end terminal is opened. When the originating side completes the corresponding bearer update, the port number before the update of the terminating side terminal is closed.

The management module is specifically configured to: after receiving the indication of opening a new port sent by the terminal-side PCRF, the destination port is the downlink service data flow of the port number before and after the update of the terminating terminal, or the source port. The uplink service data flow of the port number before and after the update of the terminal end terminal is passed.

The management module is specifically configured to: after receiving the indication of deleting the new port sent by the terminal-side PCRF, close the port number before the terminal-side terminal is updated, and only allow the destination port to be the port number of the terminal-end terminal after the update. The downlink service data flow or the uplink service data flow whose source port is the port number updated by the terminating side terminal passes. The P-GW further includes: a timing module, configured to receive a notification start delay timer sent by the management module, and notify the management module that the delay timer expires when the delay timer expires; correspondingly, the management module And when the new port is opened according to the indication of the terminal-side PCRF, the notification timing module starts a delay timer, and within the timeout period of the delay timer, the destination port is allowed to be the terminal before the terminal-end terminal is updated. The downlink service data flow of the updated port number, or the uplink service data flow of the port number before and after the update of the source port is updated, and after the delay timer expires, the terminal end terminal update is closed. The previous port number.

The P-GW further includes: a detecting module, configured to detect whether a service data flow with the new port number of the terminating terminal is used as the destination port, and when the service data flow with the new port number as the destination port is detected, The notification management module closes the port number before the update of the terminating terminal. Correspondingly, the management module is further configured to close the port number before the update of the terminating terminal according to the notification sent by the detecting module.

Of course, the present invention may be embodied in various other various modifications and changes without departing from the spirit and scope of the invention. Changes and modifications are intended to be included within the scope of the appended claims.

Claims

Claim

A method for implementing business continuity in a media surface update process, the method comprising:

When accessing an unrelated Internet Protocol IP-based communication network, during the update of the IP address and/or port number of the media plane, the terminating side gateway P-GW opens the terminal at the same time before completing the corresponding bearer update on the calling side. The port number before and after the update of the caller terminal. After the caller side completes the corresponding update, the terminating side gateway then closes the port number before the update of the terminating terminal.

The method according to claim 1, wherein the step of the terminal-side P-GW opening the port number before and after the update of the terminal-side terminal simultaneously before completing the corresponding update on the calling-side side is specifically :

The method according to claim 2, wherein, when the calling party completes the corresponding bearer update, the step of the terminal-side P-GW to close the port number before the update of the terminating terminal is specifically :

The terminal-side PCRF indicates that the terminal-side P-GW closes the port number before the terminal-side terminal is updated, and the terminal-side P-GW only allows the destination port to be the downlink service data of the port number after the terminal-side terminal is updated. The flow, or source port is the upstream service data circulation of the port number after the terminal of the terminal is updated. Over.

The method according to claim 2, wherein, when the calling party completes the corresponding bearer update, the step of the terminal-side P-GW re-closing the port number before the update of the terminating terminal is specifically: :

P-GW starts the delay timer;

After the delay timer expires, the terminal-side P-GW turns off the port number before the terminal-side terminal is updated.

The method according to claim 2, wherein, when the calling party completes the corresponding bearer update, the step of the terminal-side P-GW re-closing the port number before the update of the terminating terminal is specifically For:

The P-GW on the terminating side detects whether the service data stream with the new port number of the terminating terminal is the destination port. When the service data stream with the new port number as the destination port is detected, the terminating side P-GW is closed. The port number before the update of the terminating side terminal.

7. The method according to claim 2, wherein the terminal call side PCRF indication station The method for the terminal-side P-GW to open a new port is specifically: the updated policy charging and controlling PCC rules provided by the terminating side PCRF to the terminating side gateway;

The PCC rule includes flow description information of the updated port number.

The method according to claim 3, wherein the method for the terminal-side PCRF to indicate that the terminal-side gateway closes the port number before the terminal-side terminal is updated is:

The updated PCC rule provided by the PCRF to the terminating side gateway; wherein the PCC rule does not include flow description information of the port number before the update.

9. A system for implementing business continuity in a media face update process, the system being applied to an IP address and/or port number update process of a media face in an unrelated IP-based communication network, characterized in that the system The method includes: a terminating side P-GW, a terminating side PCRF, and a terminating side P-CSCF; wherein

The terminal-side P-CSCF is configured to: after receiving the response message of the terminal-side terminal to update the media port number, provide the service information carrying the new flow description information to the terminal-side PCRF;

The terminal-side PCRF is configured to: after receiving the service information sent by the P-CSCF on the terminating side, instruct the terminal-side P-GW to open a new port;

The terminal-side P-GW is configured to receive the indication that the terminal-side PCRF sends a new port, and before the call-side completes the corresponding update, and allows the destination port to be the pre-update and the updated after the terminal-side terminal is updated. The downlink service data flow of the port number, or the uplink service data flow of the port number before and after the update of the source port is updated; and after the corresponding bearer update is completed on the originating side, the update of the terminal end terminal is closed. The previous port number.

10. The system of claim 9 wherein:

The terminal-side P-CSCF is further configured to: after receiving the acknowledgement message fed back by the calling-side P-CSCF, send, to the terminating-end PCRF, service information that carries the port number before the terminal-end terminal update is deleted; The terminal-side PCRF is further configured to instruct the terminal-side P-GW to close the port number before the terminal-side terminal is updated; The terminating side P-GW is further configured to: after the port number before the terminal end of the terminal is updated, the destination port is allowed to be the downlink service of the port number after the terminal of the terminal is updated. The data stream or the source port is the uplink service data stream of the port number updated by the terminating side terminal.

11. The system of claim 9 wherein:

12. The system of claim 9 wherein:

13. A P-GW, the P-GW comprising: a management module, configured to update an IP address and/or a port number of a media plane when accessing an unrelated IP-based communication network Before the caller side completes the corresponding bearer update, the port number before and after the update of the terminating terminal is opened at the same time. After the caller side completes the corresponding update, the port number before the update of the terminating terminal is closed.

14. The P-GW according to claim 13, wherein:

15. The P-GW according to claim 13, wherein: The management module is specifically configured to: after receiving the indication of deleting the new port sent by the terminal-side PCRF, close the port number before the terminal-side terminal is updated, and only allow the destination port to be the port number of the terminal-end terminal after the update. The downlink service data flow or the uplink service data flow whose source port is the port number updated by the terminating side terminal passes.

The P-GW according to claim 13, wherein the P-GW further includes: a timing module, configured to receive a notification start delay timer sent by the management module, and when the delay timer expires , the notification management module delay timer expires;

The P-GW according to claim 13, wherein the P-GW further includes: a detecting module, configured to detect whether a service data flow with a new port number of the terminating terminal is received as a destination port When the service data flow with the new port number as the destination port is detected, the notification management module closes the port number before the update of the terminal side terminal;

Correspondingly, the management module is further configured to: close the port number before the update of the terminal end terminal according to the notification sent by the detecting module.