WO2016107161A1

WO2016107161A1 - Communication method, user equipment and communication device

Info

Publication number: WO2016107161A1
Application number: PCT/CN2015/085569
Authority: WO
Inventors: 高荣春; 周凯; 简海燕
Original assignee: 华为技术有限公司
Priority date: 2014-12-31
Filing date: 2015-07-30
Publication date: 2016-07-07
Also published as: CN104519537A

Abstract

Provided in the embodiments of the present invention are a communication method, a user equipment (UE) and a communication device for same, allowing an IMS to perceive handover of the UE and to facilitate subsequent charging and called domain selection. In one embodiment, the UE initiates a re-registration process after completing handover between WiFi and LTE, and carries UE handover-related information to an application server in the IMS by means of a registration request. In another embodiment, after the UE completes handover between WiFi and LTE, a P-CSCF perceives handover of the UE on the basis of an IP-CAN session process, an IP-CAN change event, an RAT-change event or similar, then the P-CSCF notifies the application server in the IMS of the handover of the UE by means of a NOTIFY request, a MESSAGE request, an INFO request, an INVITE request or similar.

Description

Communication method, user equipment and communication device

The present application claims priority to Chinese Patent Application No. CN201410856446.4, entitled "Communication Method, User Equipment, and Communication Device", filed on December 31, 2014, the entire contents of In this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a communication method, a user equipment, and a communication device in an audio/video service.

Background technique

With the increasing number of Wi-Fi access points and the increasing popularity of VoIP (Voice over Internet Protocol), WiFi voice solutions (commonly known as VoWiFi, Voice over WiFi) formed by the convergence of Wi-Fi and VoIP are rapidly developing. And application. VoWiFi (also known as VoWLAN) refers to the provision of VoIP services over Wi-Fi. Its technical advantage is the combination of VoIP and mobile phone advantages, including low price and powerful value-added features of VoIP, and roaming of mobile phones. Convenience. Wi-Fi networks are already popular in many regions, and companies that do not currently have Wi-Fi networks can quickly deploy a Wi-Fi network at a low cost. People can use IP phones anywhere the Wi-Fi network is covered. Moreover, the quality of VoWiFi calls is rapidly increasing. In many places, the quality of VoWiFi phones has reached or exceeded the quality of ordinary mobile phones. The biggest advantage of VoWiFi is its low cost, especially compared to traditional cellular phone technology.

One of the networking methods of VoWiFi is to access the IMS network through an Envolved Packed Core (EPC). In practical applications, users may switch back and forth between WiFi and LTE, and the audio/video services used by the corresponding users will switch between VoWiFi and VoLTE. Packet data network gateway in EPC in case of switching between WiFi and LTE Gateway, PGW) As an anchor of Packet Switched (PS) handover, the IP address accessed by the user equipment can be changed. However, the switch between the Wi-Fi and the LTE only involves an EPS (envolved packet switched) domain, and the IMS cannot sense that the access type of the domain in which the UE is located has changed, so that the UE charges the UE after the handover and receives a new call. There is a problem with the called domain selection. The UE may switch between Wi-Fi and PS (packet switched) networks or between PS and LTE networks, and similar problems may exist.

Summary of the invention

The purpose of the embodiment of the present invention is to solve how the IMS perceives that the UE is handed over after the UE performs the handover between the first network and the second network.

In a first aspect, an embodiment of the present invention provides a communication method, including:

The user equipment UE connects to the IP Multimedia Subsystem IMS for audio/video services;

And after the UE is switched from the first network to the second network, sending a registration request carrying the handover related information to the device in the IMS, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE. .

In a first possible implementation manner of the first aspect, in combination with the first aspect, the device in the IMS is an application server AS, and the registration request that carries the handover related information is sent in the re-registration process initiated by the UE. AS includes:

The UE sends a registration request to the proxy call session control function P-CSCF, where the registration request carries the handover related information;

The P-CSCF sends a registration request to the query call session control function I-CSCF, where the registration request carries the handover related information;

The I-CSCF queries the home subscriber server HSS to obtain a service call session control function S-CSCF serving the user, and sends a registration request to the S-CSCF, where the registration request carries the handover related information;

Sending, by the S-CSCF, a registration request to the AS, where the registration request carries the handover related information;

The AS determines, according to the indication information carried in the registration request, that the UE is switched from the first network to the second network.

In a second possible implementation manner of the first aspect, in combination with the first aspect or the first possible implementation manner of the first aspect, the handover related information is access type information after the UE is switched, and the access is performed. The type information is carried in the P-Acess-Network-Info header field of the registration request.

In a third possible implementation manner of the first aspect, in combination with the first aspect or the first possible implementation manner of the first aspect, the handover related information is handover type information of the UE, and handover type information of the UE The handover type information is used to indicate the type of handover performed by the UE.

In a fourth possible implementation manner of the first aspect, in combination with the third possible implementation manner of the first aspect, the added header field in the registration request is Handover-indication, and the handover type includes: LTE handover to Wi-Fi or Wi-Fi switches to LTE.

In a fifth possible implementation manner of the first aspect, in combination with the first aspect or any one of the possible implementation manners of the first aspect, the registration request is initiated by the UE after the UE is switched from the first network to the second network. Sent in the re-registration process.

In a sixth possible implementation manner of the first aspect, in combination with the first aspect or any possible implementation manner of the first aspect, the access type information is carried in the following parameters of the P-Acess-Network-Info header field. One or more: access-type, acces-class, utran-cell-id-3gpp, and i-wlan-node-id.

In a seventh possible implementation manner of the first aspect, in combination with the first aspect or any possible implementation manner of the first aspect, the first network is a wireless local area network (WLAN), and the second network is a long term evolution (LTE) The network; or, the first network is an LTE network, and the second network WLAN.

The second aspect of the present invention provides a user equipment UE, including:

a communication unit for connecting an IP Multimedia Subsystem IMS for audio/video services;

a sending unit, configured to send, after the UE is switched from the first network to the second network, a registration request that carries the handover related information to the device in the IMS domain, where the handover related information includes the UE after the handover Incoming type information or handover type information of the UE.

In a third aspect, the embodiment of the present invention provides another user equipment, including:

a communication interface for connecting to an IP Multimedia Subsystem IMS for audio/video services;

a memory for storing switching related information;

a transmitter, configured to send a registration request carrying the handover related information stored in the memory to the device in the IMS domain by using the communication interface in the re-registration process initiated by the UE after the UE is switched from the first network to the second network ;

The handover related information includes the access type information after the UE is switched or the handover type information of the UE.

In a second aspect, or a first possible implementation manner of the third aspect, in combination with the second aspect or the third aspect, the handover related information is access type information after the UE is switched, and the access type information is carried in The access-type parameter in the P-Acess-Network-Info (PANI) header field of the registration request.

In the second aspect or the second possible implementation manner of the third aspect, in combination with the second aspect or the third aspect, the handover related information is handover type information of the UE, and the handover type information of the UE is carried in the registration request. In the newly added header field, the handover type information is used to indicate the type of handover that the UE has.

In a second aspect or a third possible implementation of the third aspect, the second aspect or the third aspect or the second possible implementation of the second aspect, or the second possible implementation of the third aspect, The header field added in the registration request is Handover-indication, and the handover type includes: LTE handover to Wi-Fi or Wi-Fi handover to LTE.

In a second aspect or a fourth possible implementation of the third aspect, in combination with the second aspect or the third aspect or one of all possible implementations of the second aspect or one of all possible ways of the third aspect, The registration request is sent in the re-registration process initiated by the UE after the UE is handed over from the first network to the second network.

In a second aspect or a fifth possible implementation of the third aspect, the first aspect or the first A possible implementation manner or a first possible implementation manner of the third aspect, the access type information carries one or more of the following parameters in the P-Acess-Network-Info header field: access-type, acces-class , utran-cell-id-3gpp and i-wlan-node-id.

In a sixth possible implementation, in combination with the second aspect or the third aspect or any possible implementation of the second aspect or any possible implementation of the third name, the first network is a wireless local area network a WLAN, the second network is a long term evolution LTE network; or the first network is an LTE network, and the second network WLAN.

In a fourth aspect, the embodiment of the present invention provides a communication method, which is applied to an IMS device that provides audio/video services for a user equipment UE, including:

The device in the IMS receives the registration request sent by the UE, where the registration request carries the handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE;

The device in the IMS determines, according to the handover related information, that the UE is handed over from the first network to the second network.

In a first possible implementation manner of the fourth aspect, in combination with the fourth aspect, the handover related information is an access type information after the UE is switched, and the access type information is carried in a P-Acess-Network of the registration request. -Info header field.

In a second possible implementation manner of the fourth aspect, in combination with the fourth aspect, the handover related information is handover type information of the UE, and the handover type information of the UE is carried in a header field newly added in the registration request, where The handover type information is used to indicate the type of handover that the UE has.

In a third possible implementation manner of the fourth aspect, in combination with the second possible implementation manner of the fourth aspect, the added header field in the registration request is a Handover-indication, and the handover type includes: LTE switching to Wi-Fi or Wi-Fi switches to LTE.

In a fourth possible implementation manner of the fourth aspect, in combination with the fourth aspect or any possible implementation manner of the fourth aspect, the device in the IMS is an application server AS, and the device in the IMS Receiving the registration request sent by the UE includes:

The proxy call session control function P-CSCF receives the registration request sent by the UE, and the registration request carries the handover related information;

The AS receives the registration request sent by the S-CSCF, and the registration request carries the handover related information.

In a fifth possible implementation manner of the fourth aspect, the communication method further includes: sending, by the device in the IMS, the access type information after the UE handover to the charging center, in combination with any possible implementation manner of the foregoing aspect, Or an online billing system, so that the billing center or the online billing system performs billing according to the switched rate.

In a sixth possible implementation manner of the fourth aspect, in combination with any possible implementation manner of the fourth aspect, the communications method further includes: when the UE is received as a called new call, the device in the IMS Optimizing the called domain selection according to the recorded UE handover related information, including: the device in the IMS records that the current access type of the UE is accessed through WiFi, and the next time the UE is called as the called new call, the priority is to the WiFi connection; If the WiFi connection fails, the connection is implemented according to the VoLTE called domain selection process. If the current network is not deployed with VoLTE, it can be directly connected to the CS (circuit switched) domain.

In a seventh possible implementation manner of the fourth aspect, in combination with the fourth aspect or any possible implementation manner of the fourth aspect, the registration request is initiated by the UE after the UE is switched from the first network to the second network. Sent in the re-registration process.

In an eighth possible implementation manner of the fourth aspect, in combination with the second possible implementation manner of the fourth aspect, the access type information carries one of the following parameters in the P-Acess-Network-Info header field. Or multiple: access-type, acces-class, utran-cell-id-3gpp, and i-wlan-node-id.

In a seventh possible implementation manner of the fourth aspect, in combination with the fourth aspect, or any possible implementation manner of the fourth aspect, the first network is a wireless local area network (WLAN), and the second network is a long term evolution (LTE) The network; or, the first network is an LTE network, and the second network WLAN.

In an eighth possible implementation, in combination with the fourth aspect or any possible implementation manner of the fourth aspect, the registration request is in a re-registration process initiated by the UE after the UE is switched from the first network to the second network. Sent.

In a fifth aspect, an embodiment of the present invention provides a communication apparatus, which provides audio/video services for a user equipment UE connected to an IP multimedia subsystem IMS, including:

a receiving unit, configured to receive a registration request sent by the UE, where the registration request carries the handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE;

And a determining unit, configured to determine, according to the handover related information, that the UE is switched from the first network to the second network.

In a first possible implementation manner of the fifth aspect, in combination with the fourth aspect, the communications device further includes:

a sending unit, configured to send, after the determining unit, that the UE is switched from the first network to the second network, send the UE's switched access type information to the charging center or the online charging system, so that the charging center or The online charging system performs charging according to the switched rate, wherein the rate at which the UE uses the audio/video service on the first network and the rate at which the audio/video service is used in the second network are different.

In a second possible implementation manner of the fifth aspect, in combination with the fifth aspect, the handover related information is access type information after the UE is switched, and the access type information is carried in the P-Acess-Network of the registration request. -Info header field.

In a third possible implementation manner of the fifth aspect, in combination with the second possible implementation manner of the fifth aspect, the access type information carries one of the following parameters in the P-Acess-Network-Info header field. Or multiple: access-type, acces-class, utran-cell-id-3gpp, and i-wlan-node-id.

In a fourth possible implementation manner of the fifth aspect, in combination with the fifth aspect, the handover related information is handover type information of the UE, and the handover type information of the UE is carried in a header field newly added in the registration request, where The handover type information is used to indicate the type of handover that the UE has.

In a fifth possible implementation manner of the fifth aspect, in combination with the fourth possible implementation manner of the fifth aspect, the added header field in the registration request is Handover-indication, and the handover type includes: LTE switching to Wi-Fi or Wi-Fi switches to LTE.

In a sixth possible implementation manner of the fifth aspect, in combination with the fifth aspect or any possible implementation manner of the fifth aspect, the first network is a wireless local area network (WLAN), and the second network is a long term evolution (LTE) The network; or, the first network is an LTE network, and the second network WLAN.

In a seventh possible implementation manner of the fifth aspect, in combination with the fifth aspect or any possible implementation manner of the fifth aspect, the registration request is initiated by the UE after the UE is switched from the first network to the second network. Sent in the re-registration process.

In a sixth aspect, the embodiment of the present invention provides another communication apparatus, configured to provide audio/video services for a user equipment UE connected to an IP multimedia subsystem, including:

a receiver, configured to receive a registration request sent by the UE, where the registration request carries handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE, and the processor is configured to perform Determining handover related information to determine whether the UE is handed over from the first network to the second network, and if it is determined that the UE is handed over from the first network to the second network, instructing the memory to store the UE being switched from the first network to the second network Information;

And a memory, configured to store handover related information received by the receiver and information that the UE is switched from the first network to the second network.

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

a transmitter, configured to send, after the processor determines that the UE is switched from the first network to the second network Sending the access type information of the UE to the charging center or the online charging system, so that the charging center or the online charging system performs charging according to the switched rate, wherein the UE uses the audio/video service on the first network and The rates for using audio/video services on the second network are different.

In a second possible implementation manner of the sixth aspect, in combination with the sixth aspect, the handover related information is the access type information after the UE is switched, and the access type information is carried in the P-Acess-Network of the registration request. -Info header field.

In a third possible implementation manner of the sixth aspect, in combination with the second possible implementation manner of the sixth aspect, the access type information carries one or more of the following parameters in the P-Acess-Network-Info header field. : access-type, acces-class, utran-cell-id-3gpp and i-wlan-node-id.

In a fourth possible implementation manner of the sixth aspect, in combination with the sixth aspect, the handover related information is handover type information of the UE, and the handover type information of the UE is carried in a header field newly added in the registration request, where The handover type information is used to indicate the type of handover that the UE has.

In a fifth possible implementation manner of the sixth aspect, in combination with the fourth possible implementation manner of the sixth aspect, the added header field in the registration request is Handover-indication, and the handover type includes: LTE handover to Wi-Fi or Wi-Fi switches to LTE.

In a sixth possible implementation manner of the sixth aspect, in combination with all possible implementation manners of the sixth aspect and the sixth aspect, the first network is a wireless local area network (WLAN), and the second network is a long term evolution (LTE) network. Or the first network is an LTE network, and the second network is a WLAN.

In a seventh possible implementation manner of the sixth aspect, in combination with all possible implementation manners of the sixth aspect and the sixth aspect, the registration request is a weight that is initiated by the UE after the UE is switched from the first network to the second network. Sent in the registration process.

In a seventh aspect, the embodiment of the present invention provides another communication method, including:

After the user equipment UE connected to the IP Multimedia Subsystem IMS to perform the audio/video service is switched from the first network to the second network, the first device in the IMS receives the first message carrying the current access type information of the UE;

Determining, by the first device, that the UE is switched from the first network to the second network according to the current access type information;

The first device sends a second message to the second device in the IMS, where the second message carries the UE handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE.

In a first possible implementation manner of the seventh aspect, in combination with the seventh aspect, the sending, by the first device, the second message to the second device in the IMS includes: sending, by the first device, the third device The second message is that the third device forwards the second message to the second device.

In a second possible implementation manner of the seventh aspect, in combination with the seventh aspect, the sending, by the first device, the second message to the second device in the IMS includes: the first device directly sending the second message to The second device.

In a third possible implementation manner of the seventh aspect, in combination with the second possible implementation manner of the seventh aspect, the first device is a proxy call session control function P-CSCF, and the second device is an application server. AS, the third device is an inquiry call session control function S-CSCF.

In a fourth possible implementation manner of the seventh aspect, in combination with the second possible implementation manner of the seventh aspect, the first device is a proxy call session control function P-CSCF, and the second device is an application server. AS.

In a fifth possible implementation manner of the seventh aspect, in combination with all of the foregoing possible implementation manners of the seventh aspect and the seventh aspect, the second message is one of a NOTIFY request, a MESSAGE request, and an INFO request.

In a fifth possible implementation manner of the seventh aspect, in combination with the second and fourth possible implementation manners of the seventh aspect, the second message is an INVITE request, and the INVITE request is The first device is directly sent to the second device in an analog single standby voice continuous SRVCC process or an evolved analog single standby voice continuous eSRVCC.

In a sixth possible implementation manner of the seventh aspect, the seventh aspect or the seventh aspect is combined In any possible implementation manner, the handover related information is carried by a P-Acess-Network-Info header field in the second request, where the handover related information is access type information after the UE is switched.

In a seventh possible implementation manner of the seventh aspect, the handover related information is carried by the newly added parameter in the second message, in combination with any of the foregoing possible implementation manners of the seventh aspect or the seventh aspect, The handover related information is UE handover type information.

In a fourth possible implementation manner of the seventh aspect, in combination with the third possible implementation manner of the seventh aspect, the added header field in the registration request is Handover-indication, and the handover type includes: LTE handover to Wi-Fi or Wi-Fi switches to LTE.

In a fifth possible implementation manner of the seventh aspect, the access type information is carried in the following parameters of the P-Acess-Network-Info header field, in combination with any possible implementation manner of the seventh aspect or the seventh aspect One or more: access-type, acces-class, utran-cell-id-3gpp, and i-wlan-node-id.

In a sixth possible implementation manner of the seventh aspect, in combination with the seventh aspect or any possible implementation manner of the seventh aspect, the first network is a wireless local area network (WLAN), and the second network is a long term evolution (LTE) The network; or, the first network is an LTE network, and the second network WLAN.

In an eighth aspect, the embodiment of the present invention provides a further communications apparatus, including:

a receiving unit, configured to: after the user equipment UE connected to the IP multimedia subsystem IMS for performing audio/video services, switches from the first network to the second network, receiving a first message carrying the current access type information of the UE;

a determining unit, configured to determine, according to the current access type information, that the UE is switched from the first network to the second network;

And a sending unit, configured to send a second message to the device in the IMS, where the second message carries the UE handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE.

In a ninth aspect, the eighth embodiment of the present invention provides another communication apparatus, which provides audio/video services for a user equipment UE connected to an IP multimedia subsystem IMS, and the communication apparatus includes:

a receiver, configured to receive, after the user equipment UE is switched from the first network to the second network, a first message carrying the current access type information of the UE, where the UE is connected to the IP multimedia subsystem IMS for audio/video services;

a processor, configured to analyze current access type information in the second message stored in the memory, to determine whether the UE is switched from the first network to the second network, and if yes, instructing the sender to send the second message to the device in the IMS, The second message carries UE handover related information;

The transmitter is configured to send the second message to the device in the IMS, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE.

In a tenth aspect, the embodiment of the present invention provides another communication method, including:

The second device in the IMS domain receives the message carrying the handover related information sent by the first device in the IMS domain, where the carrier handover related information includes the access type information after the UE is switched or the handover type information of the UE, and the second The device provides audio/video services for the UE connected to the IP Multimedia Subsystem IMS;

The second device determines, according to the handover related information, that the UE is handed over from the first network to the second network.

In a tenth aspect, the embodiment of the present invention provides another communication device, including:

a receiving unit, configured to receive a message that carries the handover related information sent by the device in the IP multimedia subsystem IMS, where the message carrying the handover related information is a user equipment in the IMS that determines to connect to the IMS to perform audio and video services. The UE is sent after being switched from the first network to the second network;

In a first possible implementation manner of the eleventh aspect, the communications apparatus may further include:

a sending unit, configured to send, after the determining unit determines that the UE is switched from the first network to the second network, send the UE's switched access type information to the charging center or the online charging system, so that the charging center or the online charging system Charging according to the switched rate, where the UE uses the audio/video service on the first network and the rate of using the audio/video service on the second network is different

A twelfth aspect, the embodiment of the present invention provides another communication apparatus, which provides audio/video services for a user equipment UE connected to an IMS, where the communication apparatus includes:

The receiver is configured to receive a message carrying the handover related information sent by the device in the IP multimedia subsystem IMS and store the message in the memory, where the message carrying the handover related information is that the device in the IMS determines the UE from After the first network is switched to the second network, the UE is connected to the IMS to implement an audio/video service;

And a processor, configured to parse the handover related information in the memory, determine whether the UE is switched from the first network to the second network, and if yes, instruct the memory to store information that the UE is switched from the first network to the second network.

In a first implementation manner of the twelfth aspect, the communications apparatus may further include:

a transmitter, configured to send, after the UE is switched from the first network to the second network, send the UE access type information to the charging center or the online charging system, so that the charging center or the online charging system The system performs charging according to the switched rate, where the UE uses the audio/video service on the first network and the rate of using the audio/video service on the second network is different.

In any of the eighth aspect to the twelfth aspect, or in any possible implementation of the eighth to twelfth aspects,

The second message is one of a NOTIFY request, a MESSAGE request, and an INFO request;

Or the second message is an INVITE request, and the INVITE request is directly sent by the first device to the second device in an analog single standby voice continuous SRVCC process or an evolved analog single standby voice continuous eSRVCC;

Alternatively, the handover related information passes the P-Acess-Network-Info header in the second request. The domain carries, and the handover related information is access type information after the UE is switched.

Or the handover related information is carried by the P-Acess-Network-Info header field in the second request, where the handover related information is access type information after the UE is switched.

Or the handover related information is carried by the newly added parameter in the second message, where the handover related information is UE handover type information;

Alternatively, the first network is a wireless local area network WLAN, and the second network is a long term evolution LTE network; or the first network is an LTE network, and the second network WLAN.

Alternatively, the first message is an IP connection access network IP-CAN session modification procedure or a credit control request CCR in an IP-CAN change event or RAT change event notification procedure.

In a thirteenth aspect, an embodiment of the present invention provides a computer program product, where the program product stores a computer code, and when the computer code is executed, may perform any one of the communication methods of all aspects provided by the embodiments of the present invention or Any of the possible implementations of all aspects of the communication method. The computer program product can be a computer readable storage medium.

In a fourteenth aspect, the embodiment of the present invention provides a computer program, which includes computer code, when the computer code is executed, can perform communication in any or all aspects of the communication method of all aspects provided by the embodiments of the present invention. Any possible implementation of the method. The computer program product can be a computer readable storage medium.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

FIG. 1 is a schematic structural diagram of a system of a VoWiFi networking provided by an embodiment of the present invention;

2 is a schematic structural diagram of an IMS system according to an embodiment of the present invention;

3 is a schematic flowchart of a communication method according to Embodiment 1 of the present invention;

4 is a schematic flowchart of a first communication method according to Embodiment 2 of the present invention;

FIG. 5 is a schematic flowchart of a second type of communicable communication according to Embodiment 2 of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a user equipment according to Embodiment 3 of the present invention;

FIG. 7 is a schematic structural diagram of another user equipment according to Embodiment 4 of the present invention; FIG.

FIG. 8 is a schematic structural diagram of a communication apparatus according to Embodiment 5 of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a communication apparatus according to Embodiment 6 of the present invention; FIG.

FIG. 10 is a schematic structural diagram of a communication apparatus according to Embodiment 7 of the present invention; FIG.

11 is a schematic structural diagram of a communication apparatus according to Embodiment 8 of the present invention;

FIG. 12 is a schematic structural diagram of a communication apparatus according to Embodiment 9 of the present invention; FIG.

FIG. 13 is a schematic structural diagram of a communication apparatus according to Embodiment 10 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The Wi-Fi mentioned in this application is actually a generalized concept, which is almost synonymous with WLAN. The protocol standards of WLAN are IEEE802.11b, IEEE802.11a, IEEE802.11g, IEEE802.11e, IEEE802.11i, WAP, etc. Wi-Fi is a brand of WLAN, mainly adopting IEEE802.11b protocol. Since the name of WiFi has been deeply rooted in people's minds, people basically regard Wi-Fii as another name for WLAN. When it comes to VoWiFi or VoWLAN, you can think of the two as equivalent.

IMS (IP multimedia subsystem) is a general-purpose network architecture that provides multimedia services over IP-based networks. It supports the convergence of multiple fixed or mobile access methods. Seamless mobility and business continuity. Both the 3GPP network and the non-3GPP network can access the IMS to implement multimedia services. Wi-Fi is one of the non-3GPP networks.

FIG. 1 is a schematic diagram of a networking manner of VoWiFi. The user equipment can implement a Wi-Fi voice solution (VoWiFi) by connecting to the IMS through an evolved packet core (EPC) of the LTE network (one of the 3GPP networks) in the Wi-Fi network. In mode 1, the user equipment UE is connected to a public WLAN network, and accesses the 3GPP network through an untrusted non-3GPP manner, and requires the UE to support Internet Protocol Security (IPSec) and Internet Key Exchange version 2 (Internet Key). Exchange Version 2, IKEV2) authentication. To this end, an IPsec tunnel needs to be established between the EPC's Evolved Packet Data Gateway ePDG and the UE, and then the PGW is connected through the ePDG, and then the IMS is connected through the PGW. In mode 2, if the user equipment is connected to the WLAN deployed by the operator, it will be accessed through the trusted non-3GPP mode and directly connected to the IMS through the PGW. In the two modes, when the UE switches between the WLAN and the LTE, the packet data network gateway (PGW) of the EPC is used as an anchor of the handover, and the IP address of the UE can be changed.

Similar to the function of the Gateway GPRS Support Node (GGSN) in the 2G/3G, the PGW provides the user's session management and bearer control, data forwarding, IP address allocation, and non-3GPP user access. And other functions. It is an anchor point for 3GPP access and non-3GPP access public data network PDN (public data network). That is to say, in the EPC network, if the user equipment is accessed through a non-3GPP network, it may not pass through the mobility management entity MME network element and the serving gateway (SGW) network element, but must pass through the PGW network element. The ePDG is an evolved packet data gateway that undertakes the mobility management, security, and access control functions of the packet domain, and completes the transmission and reception of mobile packet data between the user equipment and the PGW. The main function of the ePDG is to ensure that the UE is connected to the EPC through an untrusted non-3GPP access network. When the UE switches between LTE and WiFi, the network element involved is mainly a PGW.

2 is a schematic diagram of the system structure of the main functional entities of the IMS. The IMS system includes a proxy call session control function (P-CSCF), and a query call session. The control function I-CSCF (interrogating call session control function) 22, the service call session control function S-CSCF (serving call session control function) 23, the policy and charging rule function (PCRF) (Policy and Charging Rule Function) 24, the home user The server HSS (Home Subscriber Server) 25, the application server AS (Application Sever) 26, and other functional entities.

The P-CSCF 21 is an ingress node that connects the IMS terminal and the IMS network, and all SIP signaling initiated and terminated by the IMS terminal through the IMS terminal passes through the P-CSCF. The P-CSCF actually acts as a proxy server that receives SIP requests and responses and forwards them to the IMS network or IMS users.

The main functions of the I-CSCF 22 include: assigning an S-CSCF to a user who initiates a SIP registration request; and routing SIP requests from other networks to the S-CSCF in session-related and session-independent processing; querying the HSS Obtain an address of the S-CSCF serving the user from the HSS; forward the SIP request or respond to the S-CSCF according to the S-CSCF address obtained from the HSS.

The S-CSCF 23 is a central node of the SIP signaling plane and functions like a non-traffic processing part of the softswitch system. The S-CSCF 23 performs session control services for the IMS terminal and maintains the session state. All SIP signaling sent and received by the IMS terminal passes through the S-CSCF 23, which checks these SIP signaling, determines if access to the application server is required, and forwards the signaling to the final destination.

The Policy and Charging Rule Function (PCRF 24) includes policy control decisions and functions based on flow charging control.

The HSS 25 is a server for storing user related information. The HSS 25 contains user-related subscription data required to process the media session, including: location information, security information, user subscription information, and S-CSCF information assigned to the user.

The application server AS 26 provides the user with value-added IP multimedia services, is responsible for providing application logic and application operating environment, processing SIP sessions sent from the IMS, initiating SIP requests, and transmitting charging information. In the IMS system, complete separation of services and control is achieved, and all specific services are provided through the AS 26.

VoIP (Voice over Internet Protocol) simply means digitizing the analog signal (Voice) and transmitting it in real time on the IP network in the form of a data packet. VoIP technology can transmit audio/video services over a packet switched PS network to meet the demand for audio/video services on data communication networks. The traditional PS network includes: GSM network (2G network), CDMA/WCDMA/TDS-CDMA (3G network), etc. LTE is evolved from the 2G/3G system. It only has the PS domain. In order to distinguish LTE, it is called EPS (Evolved). Packet System). The traditional 2G/3G has both CS domain and PS domain. The access network in the embodiment of the present invention includes an LTE, a WLAN, a 2G/3G network, and the like. In the embodiment, Wi-Fi and LTE are mainly used as an example, and those skilled in the art understand that the embodiment of the present invention is not an example. It is not meant that the invention is only limited in the switching scenarios of Wi-Fi and LTE.

The disadvantage of Wi-Fi is that the transmission distance depends on the coverage of the wireless AP, and the scope of use is limited to specific occasions, such as home, airport, school, restaurant, etc., and the mobility of Wi-Fi is not perfect. However, LTE technology makes up for this deficiency very well. LTE or 3G network coverage is very mobile. In places where there is no Wi-Fi or weak Wi-Fi signal, users can switch to LTE or 3G network, through LTE or 3G. The network implements IP audio/video services (VoLTE).

Taking Wi-Fi and LTE as an example, when the UE uses the VoWiFi and VoLTE services in the Wi-Fi and LTE networks, the PGW performs the PS handover anchor point in the handover scenario between the WiFi and the LTE, and the IP address can be achieved. The switch does not change, but the switch only involves the EPS (Packed Switched) domain. The IMS cannot sense that the access network type of the domain where the UE is located has changed, so that subsequent billing and subsequent called domain selection when a new call is received will be affected. influences. Therefore, when it is necessary to switch between Wi-Fi and LTE, the IMS can also perceive that the UE has a handover handover. The UE in the embodiment of the present invention may be a mobile phone, a tablet computer, a personal computer, or a netbook.

Embodiment 1 of the present invention provides a method for an IMS to sense a handover of a UE, where the UE completes handover from a first network to a second network (for example, between Wi-Fi and LTE, between LTE-PS networks, and Wi-Fi) After the UE and the PS network, the UE initiates the re-registration, and the device in the IMS (for example, the application server AS) perceives that the UE performs the PS handover according to the handover-related information carried in the registration request sent by the UE in the re-registration procedure (from the first network) Switch to the second network). The device in the IMS determines that after the handover of the UE occurs, it can be used for subsequent charging and subsequent called domain selection when a new call is received. The access network handover may occur regardless of whether the UE is acting as a calling or called party, and the UE may initiate a re-registration process after the handover occurs. A possible implementation manner of the first embodiment of the present invention is as shown in FIG. 3 . Taking the handover between Wi-Fi and LTE as an example, the method for the IMS to sense the handover through the re-registration process includes:

Step S31: After the handover between the Wi-Fi and the LTE is completed, the UE initiates a re-registration process, and sends a registration request (REGISTER request) to the P-CSCF in the IMS, where the registration request carries the handover related information of the UE.

Step S32: The P-CSCF sends a registration request to the I-CSCF, where the registration request carries the handover related information of the UE. The registration request carries the handover related information of the UE.

Step S33: The I-CSCF queries the HSS to obtain an S-CSCF serving the user, and sends a registration request to the S-CSCF.

Steps S34-S36, after the registration is completed, the S-CSCF sends a 200 (ok) response message to the I-CSCF, the I-CSCF sends a 200 (ok) message to the P-CSCF, and the P-CSCF sends a 200 (ok) message to the UE to confirm. Registration is complete. Steps S4 to S6 are confirmation messages sent to the UE, which are optional.

Step S37: The S-CSCF sends a registration request to the AS, where the registration request carries the handover related information.

Step S38: The AS determines, according to the handover related information carried in the registration request, the handover between the Wi-Fi and the LTE by the UE. The AS sends a 200 (ok) message to the S-CSCF. Optionally, if the rates of the VoWiFi and the VoLTE are different, the AS sends the access type information of the UE after the handover to the charging center or the online charging system, so that the charging center or the online charging system performs charging according to the switched rate. .

Optionally, the AS may optimize the called domain selection according to the recorded UE handover related information when the new call is received. For example, the IMS records that the current access type of the UE is accessed through WiFi, and then there is a new call next time. If the Wi-Fi connection is successful, the call is connected. If the WiFi connection fails, the final connection is implemented according to the VoLTE called domain selection process. If the current network is not deployed with VoLTE, the call can be directly connected to the CS domain. .

If it is a handover between the PS network and LTE, the PGW in FIG. 3 needs to support the GGSN in the 2G/3G network at the same time, and has the capability of processing LTE and 2G/3G PS services. Or if it is a handover between a Wi-Fi and a PS network, the PGW in FIG. 3 needs to support the GGSN in the 2G/3G network at the same time, and has the capability of processing LTE and 2G/3G PS services.

The handover related information may be the access type information after the handover, including the specific access network type, the protocol type corresponding to the access network, and the access type information may be carried in the registration request named P-Acess-Network-Info ( In the header field of PANI for short. The PANI header field provides access types and access information related to the current UE access network.

P-Acess-Network-Info includes multiple parameters such as access-type, access-class, utran-cell-id-3gpp, and i-wlan-node-id. The values carried by these parameters represent the access type information of the UE. . The syntax defined in the extended P-Acess-Network-Info in 3GPP is as follows:

The access-type indicates the protocol type of the access network, and is a type of access type information. The access type information of the user can be obtained through the parameter. For example, the access-type value is "IEEE-802.11b", which is a type of WLAN protocol, indicating that the UE is accessing the Wi-Fi network; if so, "3GPP-E-UTRAN-FDD" Or "3GPP-E-UTRAN-TDD", indicating that the LTE network is accessed before the UE; if it is 3GPP-UTRAN-FDD" or "3GPP-UTRAN-TDD", it indicates that the current access is a 3G network; If it is "3GPP-GERAN", it means that the current access is a 2G network.

The access-class indicates the type of the access network. If the value is "3GPP-E-UTRAN", it indicates that the UE is currently accessing the network as an LTE network. If the value is "3GPP-WLAN", the current access network of the UE is considered to be a WLAN. If the value is "3GPP-UTRAN", it can represent a 3G network.

The parameters utran-cell-id-3gpp and i-wlan-node-id represent the physical addresses of the actual access points of the UE in the LTE and WLAN networks, respectively. For example, if the MAC address of the UE's access point in the WLAN is 00-0C-F1-12-60-28, the value of i-wlan-node-id can be set to "000cf1126028".

Therefore, access type information can be carried by one or more parameters in the PANI. For example, the content carried in the P-Access-Network-Info may be: 3GPP-E-UTRAN-TDD; utran-cell-id-3gpp=234151D0FCE11. The 3GPP-E-UTRAN-TDD is an access type, which reflects the current connection. The incoming network type is LTE. From the utran-cell-id-3gpp parameter carried by the P-Access-Network-Info itself, it can also be determined that the UE is currently accessing the LTE network.

If the network currently accessed by the UE is a WLAN, the P-Access-Network-Info carrying content may be: IEEE-802.11a; i-wlan-node-id=000cf1126028. IEEE-802.11a is one of the WiFi types. According to the WiFi protocol type, it can be known that the current access network type is WiFi.

Since the UE accesses the IMS for audio/video services before the handover, the AS also records the access network information of the UE, and the two can compare whether the UE has a handover. If the access network type after the handover is different from the access network type stored by the AS, the UE has changed.

The handover related information may be handover type information indicating a handover type of the UE. A parameter can be added to the registration request to carry the switch type information. For example, a new header field is added as a handover indication (Handover-indication) for indicating handover type information. For example, the value of Handover-indication may be handover-type="Wi-Fi to LTE", indicating that the handover type of the UE is from WiFi to LTE. If the handover type of the UE is from LTE to Wi-Fi, it can be written as Handover-indication: handover-type = "LTE to Wi-Fi". Of course, other forms can also be used to record the type of handover. For example, a value of 1 indicates handover from LTE to WiFi, and a value of 0 indicates handover from WiFi to LTE, for example, Handover-indication: handover-type = “0”. The type of handover may also be indicated by the protocol type of LTE/WiFi, such as Handover-indication: handover-type = "3GPP-E-UTRAN-FDD to IEEE-802.11b".

According to the method provided by the first embodiment of the present invention, after completing the handover between Wi-Fi and LTE, the UE initiates a re-registration process to the IMS, and carries the UE handover related information to the IMS through the re-registration process, and the IMS can It is enough to perceive that the UE has a handover, which facilitates subsequent charging and called domain selection. The registration information of the re-registration process carries the handover-related information, and the transformation of the existing network element is small. Only the UE supports the re-registration and the device in the IMS domain to judge and record the handover of the UE.

The second embodiment of the present invention provides another method for IMS-aware UE handover. After the UE completes handover from the first network to the second network (for example, handover between Wi-Fi and LTE), the first in the IMS domain. A device (eg, a P-CSCF) may receive a first message carrying access type information for the UE from certain network elements (eg, PGW). After the first device in the IMS domain senses that the UE has been handed over according to the first message, the second device in the IMS (a network element that needs to be aware of the UE switching, such as charging or called domain selection) is perceived by another means. A handover occurs to the UE, for example, sending a second message carrying handover related information to the second device. Depending on the usage scenario, the first device may directly send the second message to the second device or forward to the second device through the at least one intermediate device.

As shown in FIG. 4, it is a first possible implementation manner of the second embodiment of the present invention, where the first device forwards the second message to the second device by using the third device. The following takes the first first device as the P-CSCF, the second device as the application server AS, and the third device as the S-CSCF, and the switching between the WiFi and the LTE as an example. After the UE completes the handover between WiFi and LTE, the P-CSCF according to the IP-Connectivity Access Network (IP-CAN session modification) process, IP-CAN type change (IP-CAN_CHANGE) event or wireless The access technology type change (RAT_CHANGE) event senses that the UE has a packet switched PS (packet switched) domain switch, and a message such as a NOTIFY request, a MESSAGE request, or an INFO request (ie, the INFO request) The second message) informs the AS that a handover has occurred. A NOTIFY request, a MESSAGE request, or an INFO request is defined in the 3GPP related standards. The various steps of the flow of Figure 4 are described below:

S41. After the UE completes the handover between WiFi and LTE, the PGW can pass the IP-CAN session modification process or the IP-CAN session modification (IP-CAN_CHANGE). The notification message in the event or RAT change (RAT-CHANGED) event notifies the PCRF that a bearer change occurs, and the message sent to the PCRF (that is, the first message) carries the access type information after the UE is switched.

For example, the PCRF can pass the IP-CAN session modification or IP-CAN_CHANGE event or RAT-CHANGED event notification process credit control request CCR (Credit-Control) - Request) or the credit control response CCA (Credit-Control-Answer) message carries the UE's switched access type information to sense that the UE has switched. If the PCRF does not subscribe to the IP-CAN_CHANGE/RAT-CHANGED event to the PGW, the PCRF senses the change in the UE access type through the IP-CAN session modification procedure. The access type information may be at least one of an IP-CAN type (IP-CAN Type) and a RAT type (RAT-type). For example, an IP-CAN type value of "5" indicates that the access type is 3GPP-EPS. (LTE), a value of "6" indicates that the access type is Non-3GPP-EPS (generally referred to as WLAN).

A RAT-type value of "0" indicates that the access type is WLAN access, and a RAT-type value of "1004" indicates that the access type is accessed through E-UTRAN (LTE), and the RAT-type value is " 1000" indicates that the access type is accessed through UTRAN (3G), and the RAT-type value is "1001" indicating that the access type is accessed through GERAN (2G).

S42. The PCRF sends a Re-authentication Request (RAR) message (ie, the first message) to the P-CSCF, and notifies the P-CSCF of the bearer change. The RAR carries the access type information after the UE is switched.

When the PCRF senses the change of the access type, for example, during the notification of the IP-CAN Session Modification or the notification message in the IP-CAN_CHANGE/RAT-CHANGED event, the P-CSCF access type can be notified through the RAR. A change has taken place.

S43. The P-CSCF returns a re-auth-answer RAA (re-auth-answer) message to the PCRF.

S44. The P-CSCF determines, according to the access type information after the UE is switched, that the UE generates WiFi and LTE. The switching between the S-CSCF is notified by a message such as NOTIFY, MESSAGE or INFO, and the message such as the NOTIFY request, the MESSAGE request or the INFO request carries the handover related information.

S45: The S-CSCF sends a NOTIFY request, a MESSAGE request, or an INFO request to notify the AS of the handover, and the NOTIFY, MESSAGE, or INFO message carries the handover related information.

S46. The AS determines, according to the handover related information in the message, such as NOTIFY/MESSAGE/INFO, that the UE performs handover between WiFi and LTE. The AS sends 200 messages to the S-CSCF.

Optionally, if the rates of the VoWiFi and the VoLTE are different, the AS sends the access type information after the UE is switched to the charging center or the online charging system, so that the charging center or the online charging system performs charging according to the switched rate. .

Optionally, the AS may optimize the called domain selection according to the recorded UE handover related information when the UE receives the new call as the called party. For example, the AS records that the current access type of the UE is accessed through WiFi, and the next time the UE is called as the called new call, the priority is to the WiFi connection. If the Wi-Fi connection succeeds, the call is connected; if the WiFi connection fails, Then, according to the VoLTE called domain selection process, the final connection is implemented. If the current network is not deployed with VoLTE, it can be directly connected to the CS domain.

S47. The S-CSCF sends a 200 (ok) message to the P-CSCF.

In this embodiment, the P-Access-Network-Info (PANI) header field is supported in the data structures of the NOTIFY request, the MESSAGE request, and the INFO request. As in the first embodiment, the handover related information may be access type information carried in the PANI. For the access type information carried by the PANI and the data format of the PANI, reference may be made to the description of the first embodiment. As in the first embodiment, the handover related information may be the handover type information, and a parameter may be added in the NOTIFY request, the MESSAGE request, and the INFOrequest to carry the handover type information. For example, a new header field is added as a Handover-indication to indicate the handover. For details, refer to the description of Embodiment 1.

In the second possible implementation manner of the second embodiment of the present invention, the first device directly sends the second message to the second device, where the first device is a P-CSCF, and the second device is an AS. At the end of the UE After switching between WiFi and LTE, similar to the first possible implementation of Embodiment 2, the P-CSCF senses that the UE has a PS handover through an IP-CAN Session Modification process or an IP-CAN_CHANGE or RAT-CHANGED event, and then The P-CSCF sends a second message to directly notify the AS UE of the handover, and is used for subsequent charging and subsequent called domain selection when a new call is received. The difference is mainly that the P-CSCF does not forward the second message through other network elements after the UE detects the handover, but directly sends the second message to notify the AS.

The P-CSCF can directly send a message carrying the UE handover related information to the AS by simulating a single radio voice call continuity (SV) process or a simulated single radio voice call continuity (SR) process. For example, the INVITE request is directly sent to the AS, so that the AS senses that the UE has switched. The single-standby voice continuous SRVCC service refers to the user roaming from the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) to the UMTS Terrestrial Radio Access Network/GESM during the call. When the EDGE radio access network (GERAN) is in the process of switching between the UE and the network device, the user's call is kept uninterrupted.

FIG. 5 is a schematic flowchart of a second possible implementation manner of Embodiment 2 of the present invention, where

Steps S51-S53 are the same as steps S41-S43 of the first possible mode of the second embodiment.

In step S54, the P-CSCF determines that the handover between the WiFi and the LTE occurs in the UE, and in the process of simulating the SRVCC or the eSRVCC, the SCC AS is notified by the INVITE request message, and one of the INVITE request messages carries the UE handover related information. .

The P-CSCF can also directly send a message carrying the UE handover related information to the AS through an analog session transfer process, for example, directly sending a NOTIFY/MESSAGE/INFO request to the AS, so that the AS senses that the UE is handed over. The PANI requested by the NOTIFY/MESSAGE/INFO may carry the handover related information or carry the handover related information through the newly added header field.

Specifically, the handover related information may be the access type information, and is carried in the PANI header field. For related content, refer to the first embodiment. The handover related information may also be a handover type information, and a parameter may be added to the INVITE message to carry the handover type information, for example, a new handover-indication, and the related content of the first embodiment may be referred to. Optionally, the INVITE request message sent by the P-CSCF may also carry an Access Transfer Update-Session Transfer Identifier and a correlation terminal identification number C-MSISDN (correlation mobile station international). ISDN Number) and other parameters. The ATU-STI can be used to find the AS, and the C-MSISDN can be used to associate calls.

In the method of the second embodiment of the present invention, the first device (for example, the P-CSCF) notifies the second device that needs to use the UE to switch related information by using the information that the UE is switched in a direct or indirect manner after the handover occurs. AS), for subsequent billing and called domain selection. The method does not require user equipment to participate, and directly senses and notifies the AS through the network side, and the AS can obtain the information of the UE more quickly and perform corresponding processing.

Based on the method provided in the first embodiment, the third embodiment of the present invention further provides a user equipment. As shown in FIG. 6, the user equipment includes a communication unit 61 for connecting to an IP multimedia subsystem IMS for performing audio/video services. a sending unit 62, configured to send, after the UE is switched from the first network to the second network, a registration request carrying the handover related information to the device in the IMS domain by using the communication unit 61 in the re-registration process initiated by the UE, The handover related information includes the access type information after the UE is switched or the handover type information of the UE;

Based on the method provided in the first embodiment, the fourth embodiment of the present invention further provides another user equipment. As shown in FIG. 7, the user equipment includes a communication interface 71, a memory 72, and a transmitter 73. The communication interface 71 is for connecting to the IP Multimedia Subsystem IMS for audio/video services; the memory 72 can store handover related information; and the transmitter 73 is for initiating the UE after the UE is switched from the first network to the second network. Carrying handover related storage stored in the memory 72 through the communication interface in the re-registration process The registration of the information is requested to the device in the IMS domain. The handover related information includes the access type information after the UE is switched or the handover type information of the UE. For the content and carrying manner of the related information, refer to related content in the method provided in Embodiment 1.

The user equipment in the embodiment of the present invention may be a device that can communicate by wireless, such as a mobile phone, a tablet computer, a personal computer, or a netbook.

Based on the method provided in the first embodiment, the fifth embodiment of the present invention further provides a communication device, which provides an audio/video service for a user equipment UE connected to the IMS. As shown in FIG. 8, the communication device includes: a receiving unit 81, And receiving the registration request sent by the UE, where the registration request carries the handover related information, where the handover related information includes the access type information of the UE after handover or the handover type information of the UE, and the determining unit 82 is configured to: according to the handover related information. It is determined that the UE is handed over from the first network to the second network.

The communication device may further include a sending unit 83, configured to send, after the determining unit 82 determines that the UE is switched from the first network to the second network, the UE to switch the access type information to the charging center or the online charging system, In order for the billing center or the online billing system to perform billing according to the switched rate, the rate at which the UE uses the audio/video service on the first network and the rate at which the audio/video service is used in the second network are different. Optionally, the registration request is sent by the UE in a re-registration process initiated by the UE after being switched from the first network to the second network.

Based on the method provided in Embodiment 1, the sixth embodiment of the present invention further provides another communication apparatus for providing audio/video services to a user equipment UE connected to an IP multimedia subsystem. As shown in FIG. 9, the communication apparatus includes Receiver 91, processor 92, memory 93. The receiver 91 is configured to receive a registration request sent by the UE, where the registration request carries handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE, where the registration request is that the UE is The first network is sent to the second network and sent in the re-registration process initiated by the UE; the processor 92 is configured to determine, according to the handover related information, whether the UE is switched from the first network to the second network, if The UE is switched from the first network to the second network, indicating that the memory 93 stores information that the UE is switched from the first network to the second network; the memory 93 is configured to store handover related information received by the receiver 91 and the UE Information that is switched from the first network to the second network.

Optionally, the device may further include a transmitter 94, configured to send, after the processor 92 is switched from the first network to the second network, the UE to switch the access type information to the charging center or online. The billing system is such that the billing center or the online billing system performs billing according to the switched rate, wherein the rate at which the UE uses the audio/video service on the first network and the audio/video service on the second network is different.

The communication device of the fifth and sixth embodiments of the present invention may be an application server AS in the IMS system.

In the third to sixth embodiments of the present invention, the content and the carrying manner of the related information may be referred to the related content in the method provided in Embodiment 1. The first network may be a wireless local area network WLAN, and the second network may be a long term evolution LTE network; or conversely, the first network may be an LTE network, and the second network may be a WLAN. The first network and the second network may also be LTE and PS networks respectively or vice versa, or Wi-Fi and PS networks or vice versa.

Based on the method of the second embodiment of the present invention, a seventh embodiment of the present invention provides a communication device. As shown in FIG. 10, the communication device includes: a receiving unit 101, configured to switch from a first network to a second network at a user equipment UE. Receiving, by the UE, the first message that carries the current access type information of the UE, where the UE is connected to the IMS domain of the IP multimedia subsystem to perform audio/video services, and the determining unit 102 is configured to use, according to the current access type information, Determining that the UE is handed over from the first network to the second network; the sending unit 103 is configured to send a second message to the device in the IMS after the determining unit 102 determines that the UE is switched from the first network to the second network, the second The message carries the UE handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE. The sending unit 103 may be configured to send the second message directly to the device in the IMS, or may be used to forward the second message to the device in the IMS by using the intermediate network element.

According to the method of the second embodiment of the present invention, the eighth embodiment of the present invention provides another communication device, as shown in the figure. As shown in FIG. 11, the communication device includes a receiver 111, a memory 112, a processor 113, and a transmitter 114. The receiver 11 is configured to: after the user equipment UE switches from the first network to the second network, receive a first message carrying the current access type information of the UE, and store the information in the memory 112, where the UE is connected to the IP multimedia The subsystem IMS is configured to perform audio/video services; the processor 113 is configured to analyze current access type information in the second message stored in the memory, determine whether the UE is switched from the first network to the second network, and if yes, instruct to send The device 114 sends a second message to the device in the IMS, where the second message carries the UE handover related information, and the transmitter 114 is configured to send the second message to the device in the IMS, where the handover related information includes the UE after the handover. Access type information or handover type information of the UE. The transmitter 114 may send the second message directly to the device in the IMS, or may be used to send to the intermediate network element, and the intermediate network element forwards the second message to the device in the IMS.

The communication device in the seventh and eighth embodiments of the present invention may be a P-CSCF, and the device in the IMS may be an application server AS. The first message may be an IP-CAN session modification or an IP-CAN_CHANGE event or a RAT-CHANGED event notification process CCR (Credit-Control) - Request) or a credit control response CCA (Credit-Control-Answer) message carrying access type information, and the access type information may be in an IP-CAN type (IP-CANType) and a RAT type (RAT-type) At least one. The second message may be one of a NOTIFY request, a MESSAGE request, or an INFO request. The sending unit or the sender may be forwarded through the intermediate network element S-CSCF, or may be directly sent to the AS, for example, by simulating a session transfer process. The NOTIFY/MESSAGE/INFO request carrying the handover related information is directly sent to the AS, or the SRVCC/eSRVCC procedure is simulated, and the INVITE request carrying the handover related information is directly sent to the AS. For the content and carrying manner of the related information, refer to the related content in the methods provided in Embodiments 2 and 3. The first network may be a wireless local area network WLAN, and the second network may be a long term evolution LTE network; or conversely, the first network may be an LTE network, and the second network may be a WLAN. The first network and the second network may also be LTE and PS networks respectively or vice versa, or Wi-Fi And PS network or vice versa.

Based on the method of the second embodiment of the present invention, the ninth embodiment of the present invention provides another communication device, which can provide audio/video services. As shown in FIG. 12, the communication device includes: a receiving unit 121, configured to receive a message carrying handover related information sent by a device in an IP multimedia subsystem IMS, where the message carrying the handover related information is a device in the IMS After determining that the UE is handed over from the first network to the second network, the handover related information includes the access type information after the UE is switched or the handover type information of the UE. The determining unit 122 is configured to perform the handover according to the receiving unit 121. The related information determines that the UE has switched.

Optionally, the communication device may further include a sending unit 123, configured to send, after the determining unit 122 determines that the UE is switched from the first network to the second network, send the UE's switched access type information to the charging center or online charging. The system is such that the billing center or the online billing system performs billing according to the switched rate, wherein the rate at which the UE uses the audio/video service on the first network and the audio/video service on the second network is different.

Based on the method of the second embodiment of the present invention, the tenth embodiment of the present invention provides another communication device, which can provide audio/video services for the user equipment UE connected to the IMS. As shown in FIG. 13, the communication device includes a receiver 131, a memory 132, and a processor 133. The receiver 131 is configured to receive a message that carries the handover related information and is sent by the device in the IP multimedia subsystem IMS to the memory 132, where the message carrying the handover related information is determined by the device in the IMS. The processor 133 is configured to parse the handover related information in the memory 132, determine whether the UE is switched from the first network to the second network, and if yes, instruct the memory 132 to store. The UE is switched from the first network to the information of the second network.

The communication device may further include a transmitter 134, configured to: after the processor 133 determines that the UE is switched from the first network to the second network, send the UE after the switched access type information to the charging center or the online charging system. The billing center or the online billing system performs billing according to the switched rate, wherein the UE uses the audio/video service on the first network and the rate of using the audio/video service on the second network is different.

In a possible implementation, the communication device in Embodiments 9 and 10 of the present invention may be an application server AS in the IMS, and the message carrying the handover related information may be the communication device (P-CSCF) of Embodiment 8 or 9 One of the transmitted NOTIFY request, MESSAGE request, or INFO request is forwarded by the P-CSCF through the S-CSCF, or directly by the P-CSCF through a simulated session transfer procedure. The message carrying the handover related information may be an INVITE message, which is directly transmitted to the AS by the communication device (P-CSCF) of Embodiment 8 or 9 through the analog SRVCC/eSRVCC procedure. For the content and carrying manner of the related information, refer to related content in the method provided in Embodiment 2. The first network may be a wireless local area network WLAN, and the second network may be a long term evolution LTE network; or conversely, the first network may be an LTE network, and the second network may be a WLAN.

It will be apparent to those skilled in the art that the present invention can be implemented in hardware, firmware implementation, or a combination thereof, as will be apparent to those skilled in the art. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media. As used in the present invention, a disk and a disc include a compact disc (CD), a laser, and a laser. Discs, compact discs, digital versatile discs (DVDs), floppy discs, and Blu-ray discs, where discs are usually magnetically replicated, while discs use lasers to optically replicate data. Combinations of the above should also be included within the scope of the computer readable media.

It should be noted that the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the execution process of each unit specific function can be referred to the partial description of the method embodiment. The device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. Or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

In summary, the above description is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A communication method, which is applied to a user equipment UE that is connected to an IP multimedia subsystem IMS to perform a voice service, and includes:

And after the UE is switched from the first network to the second network, sending a registration request carrying the handover related information to the device in the IMS, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE. .
The method of claim 1, wherein the device in the IMS is an application server AS, and the sending the registration request that carries the handover related information to the AS comprises:

The UE sends a registration request to the proxy call session control function P-CSCF, where the registration request carries the handover related information;

The P-CSCF sends a registration request to the query call session control function I-CSCF, where the registration request carries the handover related information;

The I-CSCF queries the home subscriber server HSS to obtain a service call session control function S-CSCF serving the user, and sends a registration request to the S-CSCF, where the registration request carries the handover related information;

Sending, by the S-CSCF, a registration request to the AS, where the registration request carries the handover related information;

The AS determines, according to the handover related information carried in the registration request, that the UE is switched from the first network to the second network.
The method according to claim 1 or 2, wherein the handover related information is access type information after handover of the UE, and the access type information is carried in a P-Acess-Network-Info header field of the registration request. in.
The method according to claim 1 or 2, wherein the handover related information is handover type information of the UE, and the handover type information of the UE is carried in a header field newly added in the registration request, the handover type information. A type used to indicate that the UE has a handover.
A user equipment (UE), comprising:

a communication unit for connecting an IP Multimedia Subsystem IMS for audio/video services;

a sending unit, configured to send, after the UE is switched from the first network to the second network, a registration request that carries the handover related information to the device in the IMS domain, where the handover related information includes the UE after the handover type information or the UE Switch type information.
The device according to claim 5, wherein the handover related information is access type information after handover of the UE, and the access type information is carried in a P-Acess-Network-Info (PANI) header of the registration request. Within the access-type parameter in the domain.
A communication method, which is applied to a device in an IMS that provides audio/video services for a user equipment UE, and is characterized by:

The device in the IMS receives the registration request sent by the UE, where the registration request carries the handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE;

The device in the IMS determines, according to the handover related information, that the UE is handed over from the first network to the second network.
A communication device for providing audio/video services to a user equipment UE connected to an IP Multimedia Subsystem IMS, comprising:

a receiving unit, configured to receive a registration request sent by the UE, where the registration request carries the handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE;

And a determining unit, configured to determine, according to the handover related information, that the UE is switched from the first network to the second network.
A communication method, comprising:

The user equipment UE that is connected to the IP Multimedia Subsystem IMS for audio/video services is from the first After the network is switched to the second network, the first device in the IMS receives the first message carrying the current access type information of the UE, where

Determining, by the first device, that the UE is switched from the first network to the second network according to the current access type information;

The first device sends a second message to the second device in the IMS, where the second message carries the UE handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE.
The method of claim 9 wherein:

The second message is one of a NOTIFY request, a MESSAGE request, and an INFO request.
The method of any one of claims 9 or 10, wherein the transmitting the second message to the second device comprises:

Sending the second message to the third device, where the third device forwards the second message to the second device.
The method according to any one of the preceding claims, wherein the second message is an INVITE request, and the INVITE request is that the first device is in a simulated single standby voice continuous SRVCC process or an evolved analog single standby voice continuous The eSRVCC is directly sent to the second device.
The method according to any one of claims 9 to 12, wherein the handover related information is carried by a P-Acess-Network-Info header field in the second request, and the handover related information is a UE handover. Post access type information.
The method according to any one of claims 9 to 12, wherein the handover related information is carried by a new parameter in the second message, and the handover related information is UE handover type information.
A communication device, comprising:

a receiving unit, configured to receive, after the user equipment UE connected to the IP multimedia subsystem IMS for performing audio/video services, switches from the first network to the second network, and receives the first information of the current access type information of the UE. Message

a determining unit, configured to determine, according to the current access type information, that the UE is switched from the first network to the second network;

And a sending unit, configured to send a second message to the device in the IMS, where the second message carries the UE handover related information, where the handover related information includes the access type information after the UE is switched or the handover type information of the UE.
A communication method, comprising:

The second device in the IMS domain receives the message carrying the handover related information sent by the first device in the IMS domain, where the carrier handover related information includes the access type information after the UE is switched or the handover type information of the UE, and the second The device provides audio/video services for the UE connected to the IP Multimedia Subsystem IMS;

The second device determines, according to the handover related information, that the UE is handed over from the first network to the second network.
A communication device, comprising:

a receiving unit, configured to receive a message that carries the handover related information sent by the device in the IP multimedia subsystem IMS, where the message carrying the handover related information is a user equipment in the IMS that determines to connect to the IMS to perform audio and video services. The UE is sent after being switched from the first network to the second network;

And a determining unit, configured to determine, according to the handover related information, that the UE is switched from the first network to the second network.