WO2009024075A1

WO2009024075A1 - Method and terminal equipment for realizing service continuity

Info

Publication number: WO2009024075A1
Application number: PCT/CN2008/072025
Authority: WO
Inventors: Xiaobo Wu; Xiaoqin Duan; Jian Zhang; Qingyu Li; Yong Xie
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-08-21
Filing date: 2008-08-18
Publication date: 2009-02-26

Abstract

The embodiment of the invention discloses a method for realizing voice service continuity, and the method includes the following steps: when the terminal moves from IP network to the neighboring CS network, the terminal initiates VCC process and switches from the voice session based on IMS in the IP network to CS voice session based on eMSC, and then switches from the CS voice session based on eMSC obtained by switching to CS voice session in the neighboring CS network. The embodiment of the invention also provides a method and terminal equipment for realizing IMS service continuity. The embodiment of the invention realizes that the continuity of voice session is held when the terminal moves between IP network and CS network, and that the continuity of service is held when the terminal moves between IP network A and IP network B.

Description

Method and terminal device for realizing business continuity

Technical field

The present invention relates to the field of communications, and in particular, to a technology for implementing business continuity. Background technique

The Universal Mobile Telecommunication System (UMTS) is a third-generation mobile communication system using WCDMA air interface technology. The UMTS system is also commonly referred to as a WCDMA communication system. The UMTS system uses a structure similar to that of the second generation mobile communication system, which includes a radio access network (RAN, Radio Access Network) and a core network (CN, Core Network). The RAN is used to handle all wireless related functions, while the CN is used to handle all voice calls and data connections in the UMTS system, and to exchange and route the UMTS network to the external network. The CN is logically divided into a circuit switched domain (CS, Circuit Switched) and a packet switched domain (PS, Packet Switched). The UMTS Terrestrial Radio Access Network (UTRAN) and the CN together with the User Equipment (UE, User Equipment) form the entire UMTS system. Referring to FIG. 1 for a specific system structure, the UTRAN is a terrestrial radio access network, which includes one or more Radio Network Subsystems (RNS). An RNS consists of a Radio Network Controller (RNC) and one or more base stations (NodeBs). The radio network controller RNC is used to control the radio resources of the UTRAN, and mainly performs functions such as connection establishment and disconnection, handover, macro diversity, and radio resource management control. The NodeB is the base station (i.e., wireless transceiver) of the UMTS system, including the wireless transceiver and baseband processing components. The physical interface protocol of the Uu interface is mainly processed through the standard Iub interface and the RNC interconnection. Its main functions are spread spectrum, modulation, channel coding and despreading, demodulation, channel decoding, and the function of converting the baseband signal and the RF signal. The interface between the RNC and the CN is the Iu interface, and the NodeB and the RNC are connected through the Iub interface. The radio network controllers (RNCs) are interconnected by Iur.

Considering the competitiveness of the future network, 3GPP is researching a new evolutionary network architecture to meet the application needs of mobile networks in the next decade or more, including System Architecture Evolution (SAE) and access networks. Long Term Evolution (LTE), where the evolved access network is called E-UTRAN. The goal of network evolution is to provide one Low latency, high data rate, high system capacity and coverage, low cost, fully IP based network. Currently, there is only hotspot coverage in the SAE/LTE network. The SAE/LTE network based on pure IP is in the hotspot coverage area, and the existing CS-based 2G/3G network is still outside the hotspot coverage area. As such, there is no implementation in the prior art for how to maintain the continuity of voice calls when a user moves between an IP-based SAE/LTE evolved network and a CS-based 2G/3G network.

Summary of the invention

In view of this, an embodiment of the present invention provides a method and a terminal device for implementing service continuity. The terminal maintains the continuity of the voice session when moving between the IP-based network and the CS-based network, and realizes the continuity of the service when the terminal moves between the IP network A and the IP network B.

In order to solve the above technical problem, an embodiment of the present invention provides a method for implementing voice service continuity, including the following steps:

When the terminal moves from the IP network to the adjacent CS network (the CS network is a 3G CS network or a 2G CS network or a CDMA CS network, etc.), a voice call continuity (VCC) process is initiated, and the terminal is The IP multimedia subsystem (IMS, IP Multimedia Subsystem)-based voice session is switched to the CS voice session of the Evolved Mobile Switching Center (eMSC) in the IP network;

And switching the eMSC-based CS voice session obtained by the handover to a CS voice session in the adjacent CS network.

Correspondingly, the embodiment of the present invention provides a session establishing method for implementing voice service continuity, and the method includes:

In the voice session establishment phase, when the terminal is in the buffer area of the IP network, an eMSC-based CS voice session is generated.

Correspondingly, an embodiment of the present invention provides a method for implementing a CSI service, where the method includes the following steps:

The IP network is divided into a buffer area and a non-buffer area, and the buffer area is adjacent to the CS network; in the IP network,

The terminal initiates an IMS service through the IMS;

The terminal initiates a CS service through the eMSC.

Correspondingly, an embodiment of the present invention provides a terminal device, where the terminal device includes: a domain update unit, configured to determine whether the received domain identifier information is the same as the domain identifier information stored by the terminal, and if the determination is no, the stored domain identifier information is updated to the received domain identifier information; And when the domain identifier information stored by the domain update unit is buffered area identifier information, initiate a VCC process, and switch the IMS-based voice session of the terminal in the IP network to an eMSC-based CS voice session; Switching the eMSC-based CS voice session obtained by the handover to a CS voice session in the neighboring CS network.

Correspondingly, an embodiment of the present invention provides a terminal device, where the terminal device includes:

The domain update unit is configured to: when the terminal is located in the IP network, determine whether the terminal receives the network identifier information of the CS network, and if yes, update the domain identifier information stored by the terminal to the buffer area identifier information. ;

a switching unit, configured to initiate a VCC process when the domain identifier information stored after the domain update unit is updated is buffered area identification information, and switch the IMS-based voice session of the terminal in the IP network to an eMSC-based voice session a CS voice session, and switching the eMSC-based CS voice session obtained by the handover to a CS voice session in the neighboring CS network.

Correspondingly, the embodiment of the invention provides a method for implementing voice service continuity from a CS network to an IP network, the method comprising the following steps:

When the terminal moves from the CS network to the neighboring IP network, the VCC process is initiated, and the CS voice session of the terminal is switched to the eMSC-based voice session in the IP network;

The eMSC based voice session in the IP network is switched to an IMS based voice session in the IP network.

a domain update unit, configured to determine whether the received domain identifier information is the same as the domain identifier information stored by the terminal, and if the determination is no, the stored domain identifier information is updated to the received domain identifier information; When the domain identification information stored by the domain update unit is buffered area identification information, a VCC process is initiated, and the CS voice session of the terminal is switched to an eMSC-based voice session in the IP network, and The eMSC-based voice session in the IP network is switched to an IMS-based voice session in the IP network.

a domain update unit, configured to: when the terminal is located in the CS network, determine whether the terminal receives network identification information of the IP network, and if yes, update the domain identifier information stored by the terminal to buffer Area identification information;

a switching unit, configured to initiate a VCC process when the domain identifier information stored by the domain update unit is updated, and switch the CS voice session of the terminal to an eMSC-based voice in the IP network. Session, and switching the eMSC based voice session in the IP network to an IMS based voice session in the IP network.

Correspondingly, the embodiment of the present invention provides a method for implementing IMS service continuity, and the method includes the following steps:

When the terminal moves from the IP network A to the IP network B, the terminal establishes a tunnel to the IP network B in the IP network A, initiates a VCC process, and switches the IMS service of the terminal in the IP network A to the IP network B through the tunnel. The IMS service.

a domain update unit, configured to determine whether the received domain identifier information is the same as the domain identifier information stored by the terminal, and if the determination is no, the stored domain identifier information is updated to the received domain identifier information; When the domain identifier information stored by the domain update unit is buffered area identification information, the terminal establishes a tunnel to the adjacent IP network B in the IP network A, and the terminal establishes a tunnel to the IP network B in the IP network A. The VCC process is initiated, and the IMS service of the terminal in the IP network A is switched to the IMS service in the IP network B through the tunnel.

The domain update unit is configured to: when the terminal is located in the IP network A, determine whether the terminal receives the network identifier information of the IP network B, and if yes, update the domain identifier information stored by the terminal to the buffer area identifier information. ;

a switching unit, configured to: when the network identifier information stored after the domain update unit is updated is the network identifier information of the IP network B, the terminal establishes a tunnel to the IP network B in the IP network A, initiates a VCC process, and passes the tunnel The IMS service of the terminal in the IP network A is switched to the IMS service in the IP network B.

In the embodiment of the present invention, when the terminal moves between the IP network and the CS network, or when the terminal moves between the IP networks, the VCC process is used, and the eMSC communication mode is used to implement the voice service when the terminal moves between the IP network and the CS network. Continuity and continuity of voice and non-verbal services when the terminal moves between IP networks. DRAWINGS

1 is a schematic diagram of a network architecture of a prior art UMTS network;

2 is a schematic diagram of a network composition architecture of an embodiment of a SAE/LTE network combined with a GSM network according to an embodiment of the present invention;

3 is a schematic diagram of a network architecture in which an eMSC network is introduced in a SAE/LTE network according to an embodiment of the present invention;

4 is a schematic diagram of a functional architecture of a VCC function according to an embodiment of the present invention;

5 is a schematic diagram of another network component architecture of a SAE/LTE network combined with a GSM network according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a terminal of an embodiment of the present invention. detailed description

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

With the continuous evolution of the network, the network architecture tends to be a pure packet-based network based on IP. During the evolution of the network, IP networks such as HSPA (High Speed Packet Access), SAE/LTE, and WIMAX are gradually evolved. At present, these IP networks only have hotspot coverage, and are in the hotspot coverage area of the IMS IP network, and outside the hotspot coverage area are still existing CS-based 2G/3G networks. Therefore, how to maintain the continuity of voice calls and how to maintain the continuity of services between IP networks will be introduced when users move between IMS-based IP networks and CS-based 2G/3G networks.

The SAE/LTE and GSM networks are taken as an example to illustrate the continuity of voice sessions between the IP network and the CS network.

2 is a schematic diagram of a network composition architecture of an embodiment of the SAE/LTE network in combination with the GSM network of the present invention. As shown in FIG. 2, the SAE/LTE network covers the hotspots in the entire network, and the boundary of the SAE/LTE network is adjacent to the boundary of the GSM network. The SAE/LTE network includes a buffer area 1 and an unbuffered area 2, an IMS network is deployed in the unbuffered area 2, and an IMS network and an eMSC network are deployed in the buffer area 1. A network architecture diagram of the SAE/LTE network after the introduction of the eMSC refers to FIG. 3. The eMSC is a scheme for carrying circuit domain data and signaling in a packet domain. By deploying an eMSC network, the terminal can initiate a circuit domain process such as simulated CS registration and CS call through the eMSC in the eMSC network coverage area. When the terminal is in the unbuffered area 2, the IMS network identifier can be received, so the terminal can register in the IMS network, and when the terminal is in the buffer area 1, the IMS network identifier and the eMSC network identifier can be simultaneously received, so the terminal It can be registered with the IMS network or with the eMSC network or both the IMS network and the eMSC network.

The base station of the unbuffered area 2 configures corresponding domain identification information (ie, unbuffered area identification information), and broadcasts the domain identification information, indicating that the terminal is in the unbuffered area 2; correspondingly, the base station of the buffer area 1 is also Configure the corresponding domain identifier information (that is, buffer area identifier information), and broadcast the domain identifier information to indicate that the terminal is in buffer area 1. In a specific implementation, the unbuffered area 2 and the buffered area 1 may also notify the terminal by using other RRC messages (for example, a Cell Update Confirm cell update confirmation message, a Handover to UTRAN Command to UTRAN handover command, a Physical Channel Reconfiguration physical channel reconfiguration message, Radio Bearer Reconfiguration radio bearer message, Radio Bearer Release radio bearer message, Radio Bearer Setu radio bearer setup message, RRC Connection Setu radio link control connection setup message, Transport Channel Reconfiguration transport channel reconfiguration message, etc. Corresponding domain identification information.

When the terminal moves from the SAE/LTE network to the GSM network, the SAE/LTE network base station system notifies the UE that the UE has entered the boundary buffer area of the SAE/LTE network and the GSM network by using the above two methods (broadcast mode or RRC message mode). . When the terminal moves from the GSM network to the SAE/LTE network, the SAE/LTE network base station system or the GSM network base station system notifies the UE that the UE has entered the SAE/LTE network and the GSM network by using the above two methods (broadcast mode or RRC message mode). Boundary buffer area 1.

The corresponding domain identification information may not be configured in the unbuffered area 2, but only the corresponding domain identification information is configured in the buffer area 1, indicating that the terminal is in the buffer area 1. If the terminal does not receive the domain identification information, the terminal may determine that it is in the unbuffered area 2, and if the terminal receives the domain identification information, the terminal may determine that it is in the buffer area 1. Further, the domain identification information may be configured only in the unbuffered area 2, and the domain identification information may not be configured in the buffer area 1. Or the corresponding device in the unbuffered area 2 and the buffered area 1 does not directly send the domain identification information to the terminal, but sets the boundary area between the SAE/LTE and the GSM as the buffer area 1, that is, when the terminal is located in the SAE/ In the buffer area 1 of the boundary between the LTE network and the GSM network, the GSM network sends the network identification information of the SAE/LTE network to the terminal (including the neighbor cell list of the SAE/LTE network, and the network frequency of the SAE/LTE network). Point information, etc., the SAE/LTE network sends the network identity information of the CS network to the terminal (including the neighbor cell list of the CS network, the CS Information such as the network frequency of the network). When the terminal moves from the SAE/LTE network to the GSM network, it receives the network identification information of the CS network, and the terminal senses that it has entered the boundary buffer area 1 of the SAE/LTE network and the GSM network. When the terminal moves from the GSM network to the SAE/LTE network, it receives the network identification information of the SAE/LTE network, and the terminal senses that it has entered the boundary buffer area 1 of the SAE/LTE network and the GSM network.

When the terminal is in the buffer area 1, the voice session can be initiated through the eMSC network, and the voice session can be initiated through the IMS, and the CS and IMS services (CSI) can be performed through the IMS and the eMSC; In the non-buffered area 2, voice services and non-voice services are initiated through the IMS.

When the terminal is powered on and connected to the network, the domain identifier information is stored. When the terminal is powered on, the received domain identifier information is compared with the domain identifier information stored in the terminal. If the difference is different, the stored domain identifier information is updated to the received domain identifier information.

The present embodiment will be described in detail below in conjunction with various states in which the terminal is located.

Example 1: The terminal accesses from unbuffered area 2 (including only IMS network):

Since the unbuffered area 2 only includes the IMS network, the terminal registers with the IMS network. When the terminal is powered on and connected to the network from the power-off state, the non-buffered area identification information is received from the broadcast channel, and the terminal directly stores the received information. Buffer area identification information;

When the terminal needs to establish a voice session, a voice session of the IMS is initiated. When a non-voice service session needs to be established, a corresponding IMS service session is initiated.

When the terminal moves inside the unbuffered area 2, the unbuffered area identification information is still received from the broadcast channel, and by comparison, the domain identification information received from the broadcast channel is the same as the stored domain identification information. The terminal does not update the stored domain identifier information. By determining the domain identifier information stored by the terminal, it can be determined that the terminal is in the non-buffered area 2, and the terminal still uses the IMS network to enjoy the voice service and the non-voice service. In a specific implementation, in the buffer area 1, the terminal may receive the network identification information sent by the adjacent CS network. If the terminal receives the network identification information of the adjacent CS network, it indicates that the terminal is located in the buffer area 1, and the terminal will The stored domain identification information is updated to the buffer area identification information. Here, it is also possible to determine whether the terminal receives the network identification information of the CS network. If the determination result here is no, the terminal does not update the stored domain identification information to the buffer area identification information. The domain identification information can determine that the terminal is in the non-buffered area 2, and the terminal still uses the IMS network to enjoy voice services and non-voice services. When the terminal moves from the unbuffered area 2 to the buffered area 1, the terminal will receive the buffered area identification information from the broadcast channel, and by comparison, the domain identification information and the stored domain identifier received from the broadcast channel are known. The information is not the same. At this time, the terminal updates the domain identifier information stored in the terminal to the buffer area identifier information. By determining the domain identifier information stored in the terminal, it can be determined that the terminal is located in the buffer area 1, and the terminal finds that it has been from the unbuffered area. 2 Moves into the buffer area 1 , the terminal registers with the eMSC network, and initiates a VCC process, and switches the terminal's IMS-based voice session to the eMSC-based CS voice session, and the terminal's non-voice IMS service remains in the IMS network. In the specific implementation, it is also possible to determine whether the terminal receives the network identification information of the CS network, and the determination result here is yes. At this time, the terminal updates the stored domain identification information to the buffer area identification information. The stored domain identification information may determine that the terminal is located in the buffer area 1, and the terminal finds that it has moved from the unbuffered area 2 into the buffer area 1, the terminal registers with the eMSC network, and initiates a VCC process to switch the terminal based on the IMS voice session. For the eMSC-based CS voice session, the non-voice IMS service of the terminal remains in the IMS network.

Regarding how the terminal initiates the VCC process to switch the terminal based on the IMS voice session to the eMSC-based CS voice session, please refer to FIG. 4. As shown in FIG. 4, the terminal UEA performs a voice call with the UEB, and the system can implement the terminal UEA based on the IMS voice session. VCC handover between eMSC-based CS voice sessions. When the UEA is in the IMS network, a voice session is initiated by the IMS, and the IMS voice session is anchored on the Voice Continuity Application Server (VCC AS) when the UEA moves from the IMS to the eMSC network. The UEA initiates a CS voice session through the eMSC, and the CS voice session is also anchored on the VCC AS. After the CS voice session is established, the IMS voice session between the UEA and the VCC AS is disconnected, and the terminal is implemented. The UEA is based on VCC handover between the IMS voice session and the eMSC based CS voice session. Correspondingly, when the UEA is in the eMSC network, the CS voice session is initiated by the eMSC, and the CS voice session of the eMSC is anchored on the voice continuity application server VCC AS, when the UEA moves from the eMSC network to the IMS network, The UEA initiates a voice session through the IMS, and the IMS voice session is also anchored on the VCC AS. After the IMS voice session is established, the eMSC voice session between the UEA and the VCC AS is disconnected, and the terminal UEA is implemented based on VCC handover between IMS voice session and eMSC based CS voice session.

When the terminal moves inside the buffer area 1, the terminal will receive the buffer area identification information from the broadcast channel, and by comparison, the domain identification information and the stored domain received from the broadcast channel are known. The identification information is the same, and the terminal does not update the stored domain identification information. At this time, by determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the buffer area 1, and the voice session of the terminal remains in the eMSC network, and the non-voice IMS service of the terminal remains in the IMS network. In the specific implementation, it is also possible to determine whether the terminal receives the network identification information of the CS network. If the determination result here is yes, the terminal will still maintain the stored domain identification information as the buffer area identification information. The domain identifier information stored in the terminal can be determined that the terminal is still located in the buffer area 1, and the voice session of the terminal remains in the eMSC network, and the non-voice IMS service of the terminal remains in the IMS network.

When the terminal returns from the buffer area 1 to the unbuffered area 2, the terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, the domain identification information received from the broadcast channel and The stored domain identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and determines that the terminal is located in the non-buffered area 2 by determining the domain identifier information stored by the terminal. I have moved from buffer area 1 to non-buffer area 2. When the terminal finds that its voice session is on the eMSC network, it initiates a VCC process, and switches the terminal's CS voice session based on eMSC to an IMS-based voice session. The voice IMS service remains on the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identification information of the CS network. If the determination result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. Determining the domain identification information stored by the terminal may determine that the terminal is located in the unbuffered area 2. When the terminal finds that its own voice session is in the eMSC network, the terminal initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to the IMS-based voice session. The non-voice IMS service of the terminal remains in the IMS network.

When the terminal moves from the buffer area 1 to the GSM network, the CS-based voice session of the terminal is switched to the CS voice session of the GSM network by the handover between the CS sessions.

When the terminal moves from the GSM network to the buffer area 1, the CS voice session of the terminal in the GSM network is switched to the CS voice session based on the eMSC by the smooth handover between the CS sessions, if the terminal continues from the The punched area 1 moves to the unbuffered area 2, and the eMSC-based CS voice session is transferred to the IMS network-based CS voice session through the VCC procedure. When the terminal continues to move from the buffer area 1 to the non-buffer area 2, the EMSC-based CS voice session is transferred to the IMS network-based CS voice session by the VCC procedure with reference to the above-mentioned "When the terminal is from the buffer area 1 The process flow when returning to the non-buffered area 2 is as follows: The terminal will receive the unbuffered area identification information from the broadcast channel, and the domain identifier received from the broadcast channel is known by comparison. The information and the stored domain identifier information are different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and determines that the terminal is located in the non-buffered area 2 by determining the domain identifier information stored by the terminal. The terminal finds that it has moved from the buffer area 1 to the unbuffered area 2. When the terminal finds that its voice session is in the eMSC network, it initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to an IMS-based voice session. The non-voice IMS service remains on the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the IP network, and if the judgment result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. Determining the domain identification information stored by the terminal may determine that the terminal is located in the unbuffered area 2. When the terminal finds that its own voice session is in the eMSC network, the terminal initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to the IMS-based voice session. The non-voice IMS service of the terminal remains in the IMS network.

Example 2: The terminal is connected from buffer area 1 (non-buffer area 2 includes only the IMS network):

Although the unbuffered area 2 includes only the IMS network, the buffer area 1 includes the eMSC and the IMS network, so when the terminal is in the buffer area 1, the terminal can register with the eMSC network or register with the IMS network. When the terminal is powered on to access the network from the power-off state, the buffer domain identification information is received from the broadcast channel, and the terminal directly stores the received buffer area identification information;

When the terminal establishes a voice session, a CS voice session can be initiated through the eMSC network, and a voice session can also be initiated through the IMS network. In a specific implementation, when a voice session is established, the terminal initiates a voice session and establishes an IMS voice session through the IMS network, and may further initiate a VCC standard process, and switch the IMS-based voice session to an eMSC-based CS voice session to ensure When the area is buffered, the terminal conducts a voice session through the eMSC network. When a non-voice service session needs to be established, a corresponding IMS service session is initiated.

When the terminal moves inside the buffer area 1, the buffer area identification information is still received from the broadcast channel. By comparison, the domain identification information received from the broadcast channel is the same as the stored domain identification information, and the terminal does not Update the stored domain identification information. By determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the buffer area 1. When the terminal finds that its own voice session is in the eMSC network, the voice session is maintained on the eMSC network, and the non-voice IMS service session is maintained in the IMS network. When the terminal finds its own voice session in the IMS network, initiates a VCC process, and switches the terminal's IMS-based voice session to an eMSC-based CS voice session, and the terminal's non-voice IMS service remains in the IMS network. In a specific implementation, it may also be determined whether the terminal receives the network identifier of the CS network. If the judgment result is yes, the terminal will update the stored domain identifier information to the buffer area identifier information. At this time, by determining the domain identifier information stored by the terminal, it can be determined that the terminal is located in the buffer area 1, when The terminal finds that its own voice session is in the eMSC network, and then maintains the voice session in the eMSC network, and maintains the IMS service session in the IMS network; when the terminal finds that its voice session is in the IMS network, initiates a VCC process, and the terminal is based on the IMS. The voice session is switched to an eMSC-based CS voice session, and the non-voice IMS service of the terminal is still maintained in the IMS network.

When the terminal moves from the buffer area 1 to the non-buffer area 2, the terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, the domain identification information and the stored domain received from the broadcast channel are known. The identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and at the same time, by determining the domain identifier information stored in the terminal, it can be confirmed that the terminal is located in the non-buffered area 2, and the terminal finds itself. The non-buffered area 2 has been moved from the buffer area 1. When the terminal finds that its own voice session is on the eMSC network, the VCC process is initiated, and the terminal's CS voice session based on the eMSC is switched to the IMS-based voice session, and the IMS service of the terminal remains. In the IMS network; when the terminal finds that its own voice session is in the IMS network, the voice session is maintained in the IMS voice session, and the other IMS services of the terminal are still maintained in the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identification information of the CS network. If the determination result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information, and determines the terminal storage. The domain identification information can confirm that the terminal is located in the unbuffered area 2, and the terminal finds that it has moved from the buffer area 1 into the unbuffered area 2, and when the terminal finds that its own voice session is on the eMSC network, initiates a VCC process, and the terminal is based on The CS voice session of the eMSC is switched to the IMS-based voice session, and the IMS service of the terminal remains in the IMS network. When the terminal finds that its voice session is in the IMS network, the voice session is maintained in the IMS voice session, and the terminal's non-voice IMS is used. The business remains on the IMS network.

When the terminal moves inside the unbuffered area 2, the terminal still receives the unbuffered area identification information from the broadcast channel, and compares the domain identification information and the stored domain identification information received from the broadcast channel by comparison. Similarly, the terminal does not update the stored domain identification information. By determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the unbuffered area 2, and the voice session of the terminal is maintained in the IMS network, and the non-voice IMS service of the terminal is still maintained in the IMS network. In a specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network, and the determination result here is no. By determining the domain identifier information stored by the terminal, it may be determined that the terminal is located in the non-buffered area 2, and the terminal's voice session is performed. Maintaining the IMS network, the non-voice IMS service of the terminal remains in the IMS network. When the terminal returns from the unbuffered area 2 back to the buffer area 1, the terminal will receive the buffer area identification information from the broadcast channel, and by comparison, it can know the domain identification information and storage received from the broadcast channel. The domain identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the buffer area identifier information. At the same time, by determining the domain identifier information stored by the terminal, it can be determined that the terminal is located in the buffer area 1, and the terminal finds that it has been The non-buffered area 2 is moved into the buffer area 1. When the terminal finds that its own voice session is in the IMS network, the VCC process is initiated, and the terminal's IMS-based voice session is switched to the eMSC-based CS voice session, and the terminal's non-voice IMS service remains. Stay on the IMS network. In the specific implementation, it is also possible to determine whether the terminal receives the network identification information of the CS network, and the determination result here is yes. By determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the buffer area 1, and the terminal finds that it has not been slowed down. The punched area 2 is moved into the buffer area 1. When the terminal finds that its own voice session is in the IMS network, the VCC process is initiated, and the terminal's IMS-based voice session is switched to the eMSC-based CS voice session, and the terminal's non-voice IMS service remains. IMS network.

When the terminal moves from the buffer area 1 to the GSM network, the eMSC-based CS voice session is switched to the CS voice session of the GSM network by smooth handover between the CS sessions.

When the terminal moves from the GSM network to the buffer area 1, the CS voice session of the terminal in the GSM network is switched to the eMSC-based CS voice session by smooth handover between CS sessions. When the terminal continues to move from the buffer area 1 to the buffer area 2, the transfer of the eMSC-based CS voice session to the IMS network-based CS voice session by the VCC procedure is referred to the above "when the terminal re-from the buffer area 1 The processing flow when returning to the non-buffered area 2 is as follows: The terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, it can know the domain identification information and storage received from the broadcast channel. The domain identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and determines that the terminal is located in the non-buffer area 2 by determining the domain identifier information stored in the terminal. The non-buffered area 2 has been moved from the buffer area 1. When the terminal finds that its own voice session is on the eMSC network, it initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to an IMS-based voice session, and the terminal's non-voice. The IMS service remains on the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the IP network, and if the judgment result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. Determining the domain identification information stored by the terminal may determine that the terminal is located in the unbuffered area 2. When the terminal finds that its own voice session is in the eMSC network, the terminal initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to the IMS-based voice session. Non-voice IMS of the terminal The business remains on the IMS network.

Figure 5 is a block diagram showing the network composition of another embodiment of the SAE/LTE network in combination with the GSM network of the present invention. As shown in Figure 5, the SAE/LTE network covers the hotspots in the entire network, and the edge of the SAE/LTE network is adjacent to the edge of the GSM network. The SAE/LTE network includes a buffer area 1 and an unbuffered area 2, and this embodiment is different from the embodiment shown in FIG. 2 in that an IMS network is deployed in both the unbuffered area 2 and the buffer area 1. eMSC network.

When the terminal is in the buffer area 1 and the non-buffer area 2, the IMS network identity and the network and eMSC network registration can be received simultaneously.

The base station of the unbuffered area 2 configures corresponding domain identification information (unbuffered area identification information), and broadcasts the domain identification information, indicating that the terminal is in the unbuffered area 2; correspondingly, the base station of the buffer area 1 is also configured. Corresponding domain identification information (buffer area identification information), and broadcasting the domain identification information, indicating that the terminal is in the buffer area 1. It is also possible to configure the corresponding domain identification information in the unbuffered area 2, and only configure the corresponding domain identification information in the buffer area 1, indicating that the terminal is in the buffer area 1. In a specific implementation, the unbuffered area 2 and the buffered area 1 may also notify the terminal by using other RRC messages (for example, a Cell Update Confirm cell update confirmation message, a Handover to UTRAN Command to UTRAN handover command, a Physical Channel Reconfiguration physical channel reconfiguration message, Radio Bearer Reconfiguration radio bearer message, Radio Bearer Release radio bearer message, Radio Bearer Setup radio bearer setup message, RRC Connection Setu radio link control connection setup message, Transport Channel Reconfiguration transport channel reconfiguration message, etc. Corresponding domain identification information.

The corresponding domain identification information may not be configured in the unbuffered area 2, but only the corresponding domain identification information is configured in the buffer area 1, indicating that the terminal is in the buffer area 1. If the terminal does not receive the domain identification information, the terminal may determine that it is in the unbuffered area 2, and if the terminal receives the domain identification information, the terminal may determine that it is in the buffer area 1. Further, it is also possible to configure the domain designation only in the unbuffered area 2, and not to configure the domain designation in the buffer area 1. Or the corresponding device in the unbuffered area 2 and the buffered area 1 does not directly send the domain identification information to the terminal, but sets the boundary area between the SAE/LTE and the GSM as the buffer area 1, that is, when the terminal is located in the SAE/ In the buffer area 1 of the boundary between the LTE network and the GSM network, the SAE/LTE network sends the network identification information of the IP network to the terminal, and the GSM network sends the network identification information of the CS network to the terminal (including the neighboring cell of the CS network). List, the network of the CS network At least one of the network frequency point information, when the terminal receives the network identification information of the CS network from the SAE/LTE network to the GSM network, the terminal senses that it has entered the boundary buffer area of the SAE/LTE network and the GSM network. 1. When the terminal moves from the GSM network to the SAE/LTE network, it will receive the network identification information of the IP network, and the terminal perceives that it has entered the boundary buffer area 1 of the SAE/LTE network and the GSM network.

When the terminal is in the buffer area 1 and the non-buffer area 2, a voice session can be initiated through the eMSC network, a voice session can also be initiated through the IMS, and CS and IMS joint services (CSI, Combination of CS can be performed through the IMS and the eMSC). And IMS Services); when the terminal is powered on to access the network from the shutdown state, the received domain identification information is stored; when the terminal is powered on, the received domain identification information and the domain identification information stored in the terminal are For comparison, if the two are different, the stored domain identification information is updated to the received domain identification information.

Example 3: The terminal accesses from unbuffered area 2 (non-buffered area 2 simultaneously deploys IMS and eMSC network):

The terminal can be registered with the IMS network or with the eMSC network. When the terminal is powered on from the power-off state and accesses the network, the non-buffered area identification information is received from the broadcast channel, and the terminal directly stores the received unbuffered area identification information;

When the terminal needs to establish a voice session, an IMS voice session may be initiated; an eMSC voice session may also be initiated. When another service session needs to be established, a corresponding IMS service session is initiated.

When the terminal moves inside the unbuffered area 2, the unbuffered area identification information is still received from the broadcast channel, and by comparison, the domain identification information received from the broadcast channel is the same as the stored domain identification information. The terminal does not update the stored domain identification information. By determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the unbuffered area 2. When the terminal finds that its own voice session is based on the IMS network, the terminal can still enjoy the voice service and the non-voice service using the IMS network; when the terminal finds its own voice The session is on the eMSC network, and the voice session of the terminal is maintained on the eMSC network. In a specific implementation, it may be determined whether the terminal receives the network identifier information of the CS network. If the determination result is no, the terminal does not update the stored domain identifier information to the buffer area identifier information. The stored domain identification information may determine that the terminal is in the non-buffered area 2. When the terminal finds that its own voice session is based on the IMS network, the terminal may still enjoy the voice service and the non-voice service using the IMS network; when the terminal finds its own voice session at the eMSC The network maintains the voice session of the terminal on the eMSC network.

When the terminal moves from the unbuffered area 2 to the buffer area 1, the terminal will receive from the broadcast channel. The information of the buffer area identification information is different from that of the domain identifier information that is received by the terminal, and the terminal identifies the domain identifier information stored in the terminal as the buffer area identifier information. At the same time, by determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the buffer area 1. At this time, the terminal finds that it has moved from the unbuffered area 2 into the buffer area 1, and the terminal registers with the eMSC network, and initiates a VCC process, and the terminal is terminated. The IMS-based voice session is switched to an eMSC-based CS voice session, and other IMS services for the terminal remain in the IMS network. When the terminal finds that its own voice is based on the eMSC network, the terminal's voice session is maintained on the eMSC network, and the other IMS services of the terminal remain in the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network. If the judgment result is yes, the terminal updates the stored domain identifier information to the buffer area identifier information. The domain identification information may determine that the terminal is in the buffer area 1, and the terminal finds that it has moved from the unbuffered area 2 into the buffer area 1, the terminal registers with the eMSC network, and initiates a VCC process, and the terminal is based on the IMS voice session. Switching to an eMSC-based CS voice session, the other IMS services for the terminal remain in the IMS network. When the terminal finds that its own voice is based on the eMSC network, the terminal's voice session is maintained in the eMSC network, and the other IMS services of the terminal remain in the IMS network.

When the terminal moves inside the buffer area 1, the terminal will receive the buffer area identification information from the broadcast channel, and by comparison, the domain identifier information received from the broadcast channel is the same as the stored domain identifier information. The terminal does not update the stored domain identification information. By determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the buffer area 1, and the voice session of the terminal remains in the eMSC network, and the non-voice IMS service of the terminal remains in the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network. If the judgment result is yes, the terminal updates the stored domain identifier information to the buffer area identifier information. The domain identification information can determine that the terminal is in the buffer area 1, and the voice session of the terminal remains in the eMSC network, and the non-voice IMS service of the terminal remains in the IMS network.

When the terminal returns from the buffer area 1 to the unbuffered area 2, the terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, the domain identification information received from the broadcast channel and The stored domain identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and determines that the terminal is located in the unbuffered area 2 by determining the domain identifier information stored by the terminal. The terminal finds that it has moved from the buffer area 1 to the unbuffered area 2. When the terminal finds that its voice session is on the eMSC network, the terminal's voice session is maintained on the eMSC network, and the terminal will end up. The other IMS services of the terminal still remain in the IMS network, or the voice session is switched to the IMS network; when the terminal finds that its voice session is in the IMS network, the voice session of the terminal is maintained in the IMS network, and the non-voice of the terminal is The IMS service remains in the IMS network or the voice session is switched to the eMSC network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network. If the judgment result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. The stored domain identification information may determine that the terminal is in the unbuffered area 2, and when the terminal finds that its own voice session is in the eMSC network, the terminal's voice session is maintained on the eMSC network, and the other IMS service of the terminal remains in the IMS network, or The voice session is switched to the IMS network; when the terminal finds that its own voice session is in the IMS network, the terminal's voice session is maintained on the IMS network, and the terminal's non-voice IMS service remains in the IMS network, or the The voice session is switched to the eMSC network.

When the terminal moves from the GSM network to the buffer area 1, the CS voice session of the terminal in the GSM network is switched to the eMSC-based CS voice session by smooth handover between CS sessions. When the terminal continues to move from the buffer area 1 to the buffer area 2, the transfer of the eMSC-based CS voice session to the IMS network-based CS voice session by the VCC procedure is referred to the above "when the terminal re-from the buffer area 1 The processing flow when returning to the non-buffered area 2 is as follows: The terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, it can know the domain identification information and storage received from the broadcast channel. The domain identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and determines that the terminal is located in the non-buffer area 2 by determining the domain identifier information stored in the terminal. The non-buffered area 2 has been moved from the buffer area 1. When the terminal finds that its own voice session is on the eMSC network, it initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to an IMS-based voice session, and the terminal's non-voice. The IMS service remains on the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the IP network, and if the judgment result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. Determining the domain identification information stored by the terminal may determine that the terminal is located in the unbuffered area 2. When the terminal finds that its own voice session is in the eMSC network, the terminal initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to the IMS-based voice session. The non-voice IMS service of the terminal remains in the IMS network. Example 4: The terminal accesses from the buffer area (the non-buffer area simultaneously deploys the IMS and the eMSC network): The terminal can be registered in the eMSC network or registered in the IMS network. When the terminal is powered on to access the network from the power-off state, the buffer area identification information is received from the broadcast channel, and the terminal directly stores the received buffer area identification information;

When the terminal establishes a voice session, a CS voice session can be initiated through the eMSC network, and a voice session can also be initiated through the IMS network. In a specific implementation, when a voice session is established, the terminal initiates a voice session and establishes an IMS voice session through the IMS network, and may further initiate a VCC standard process, and switch the IMS-based voice session to an eMSC-based CS voice session to ensure In the unbuffered area, the terminal conducts a voice session through the eMSC network. When another service session needs to be established, a corresponding IMS service session is initiated.

When the terminal moves inside the buffer area 1, the buffer area identification information is still received from the broadcast channel. By comparison, the domain identification information received from the broadcast channel is the same as the stored domain identification information, and the terminal does not Update the stored domain identification information. By determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the buffer area 1. When the terminal finds that its own voice session is in the eMSC network, the terminal's voice session is maintained in the eMSC network, and the terminal's IMS service is maintained in the IMS network. When the terminal finds its own voice session in the IMS network, initiates a VCC process, and switches the terminal's IMS-based voice session to an eMSC-based CS voice session, and the terminal's non-voice IMS service remains in the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network. If the judgment result is yes, the terminal updates the stored domain identifier information to the buffer area identifier information. The domain identification information may determine that the terminal is in the buffer area 1. When the terminal finds that its own voice session is in the eMSC network, the terminal's voice session is maintained in the eMSC network, and the terminal's IMS service is maintained in the IMS network; The voice session of the user is initiated on the IMS network, and the VCC process is initiated. The IMS-based voice session is switched to the eMSC-based CS voice session, and the non-voice IMS service of the terminal is still maintained in the IMS network.

When the terminal moves from the buffer area 1 to the non-buffer area 2, the terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, the domain identification information and the stored domain received from the broadcast channel are known. The identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and determines that the terminal is located in the buffer area 2 by determining the domain identifier information stored in the terminal. Moving from buffer area 1 into unbuffered area 2, when the terminal finds its own voice session on the eMSC network, initiates a VCC process, and cuts the terminal based on the eMSC's CS voice session. Switching to the IMS-based voice session, the IMS service of the terminal is still maintained in the IMS network, or the voice session is still maintained in the eMSC domain; when the terminal finds that its voice session is in the IMS network, the voice session of the terminal is kept in the Said IMS network, or switching the voice session to an eMSC domain. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network. If the judgment result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. The stored domain identification information may determine that the terminal is in the non-buffered area 2. When the terminal finds that its own voice session is on the eMSC network, initiates a VCC process, and switches the terminal's CS-based voice session to an IMS-based voice session, and the terminal's IMS is used. The service remains in the IMS network, or the voice session remains in the eMSC domain; when the terminal finds that its voice session is on the IMS network, the terminal's voice session is maintained on the IMS network, or the voice session is switched to eMSC domain.

When the terminal moves inside the unbuffered area 2, the terminal still receives the unbuffered area identification information from the broadcast channel, and compares the domain identification information and the stored domain identification information received from the broadcast channel by comparison. Similarly, the terminal does not update the stored domain identification information. By determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the unbuffered area 2. When the terminal finds that its own voice session is based on the IMS network, the terminal can still enjoy the voice service and the non-voice service using the IMS network, or the voice session is Switching to the eMSC domain; when the terminal finds that its own voice session is on the eMSC network, the terminal's voice session is maintained on the eMSC network, the terminal's IMS service is still maintained in the IMS network, or the VCC process is initiated, and the terminal is based on the eMSC's CS voice. The session is switched to an IMS-based voice session, and the IMS service of the terminal is still maintained in the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network. If the judgment result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. The stored domain identification information may determine that the terminal is in the non-buffered area 2, and the terminal finds that its own voice session is based on the IMS network, and the terminal may still enjoy the voice service and the non-voice service using the IMS network, or transfer the voice session to the eMSC domain. When the terminal finds that its own voice session is on the eMSC network, the terminal's voice session is maintained on the eMSC network, the terminal's IMS service is still maintained in the IMS network, or the VCC process is initiated, and the terminal's eMSC-based CS voice session is switched based on The IMS voice session maintains the IMS service of the terminal on the IMS network.

When the terminal returns from the unbuffered area 2 back to the buffer area 1, the terminal will receive the buffer area identification information from the broadcast channel, and by comparison, it can know the domain identification information and storage received from the broadcast channel. The domain identifier information is different. At this time, the terminal updates the domain identifier information stored in the terminal to The buffer area identifies the information, and at the same time, by determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the buffer area 1. At this time, the terminal finds that it has moved from the unbuffered area 2 into the buffer area 1, and when the terminal finds that its own voice session is The IMS network initiates a VCC process, and switches the IMS-based voice session to the eMSC-based CS voice session, and maintains other IMS services of the terminal in the IMS network. When the terminal finds that its voice session is in the eMSC network, the terminal The voice session remains on the eMSC network, and the IMS service of the terminal remains in the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the CS network. If the judgment result is yes, the terminal updates the stored domain identifier information to the buffer area identifier information. The domain identification information may determine that the terminal is in the buffer area 1. When the terminal finds that its own voice session is in the IMS network, initiates a VCC process, and switches the terminal's IMS-based voice session to an eMSC-based CS voice session, and the other IMS service of the terminal. Still maintaining the IMS network, when the terminal finds that its own voice session is on the eMSC network, the terminal's voice session is maintained on the eMSC network, and the terminal's IMS service remains in the IMS network.

When the terminal moves from the GSM network to the buffer area 1, the CS voice session of the terminal in the GSM network is switched to the eMSC-based CS voice session by smooth handover between CS sessions. When the terminal continues to move from the buffer area 1 to the buffer area 2, the transfer of the eMSC-based CS voice session to the IMS network-based CS voice session by the VCC procedure is referred to the above "when the terminal re-from the buffer area 1 The processing flow when returning to the non-buffered area 2 is as follows: The terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, it can know the domain identification information and storage received from the broadcast channel. The domain identifier information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the unbuffered area identifier information, and determines that the terminal is located in the non-buffer area 2 by determining the domain identifier information stored in the terminal. The non-buffered area 2 has been moved from the buffer area 1. When the terminal finds that its own voice session is on the eMSC network, it initiates a VCC process, and switches the terminal's CS voice session based on the eMSC to an IMS-based voice session, and the terminal's non-voice. The IMS service remains on the IMS network. In the specific implementation, the terminal may also determine whether the terminal receives the network identifier information of the IP network, and if the judgment result is no, the terminal updates the stored domain identifier information to the unbuffered area identifier information. Determining the domain identifier information stored by the terminal may determine that the terminal is located in the unbuffered area 2, and when the terminal finds that its own voice session is in the eMSC network, initiates a VCC process, and the terminal is The eMSC-based CS voice session is switched to an IMS-based voice session, and the non-voice IMS service of the terminal is still maintained in the IMS network.

The voice session may be a calling session initiated by the terminal, or may be a called session when the terminal is called.

When the IP network is a WIMAX or HRPD/UMB network, maintaining the voice continuity between the two networks and the CS network-based 3G network is similar to maintaining the voice continuity of the SAE/LTE network and the GSM network, and then Repeat the narrative.

Correspondingly, the embodiment of the present invention provides a method for implementing IMS service continuity. The VCC process is used to implement continuity of IMS voice service and IMS non-language service when the terminal moves between IP networks.

The following takes the SAE/LTE network and the WIMAX network as an example. It is assumed that the SAE/LTE network is divided into a buffer area non-buffer area, the buffer area is a boundary area between the SAE/LTE network and the WIMAX network, the buffer area is adjacent to the WIMAX, and the base station of the non-buffer area configures corresponding domain identification information. (that is, the unbuffered area identification information), and broadcast the domain identification information, indicating that the terminal is in the non-buffer field; correspondingly, the base station of the buffer area is also configured with corresponding domain identification information (ie, buffer area identification information), The domain identification information is broadcasted to indicate that the terminal is in the buffer domain. In a specific implementation, the unbuffered area and the buffered area may also notify the terminal by using other RRC messages (for example, Cell Update Confirm, Cell Update Confirm message, Handover to UTRAN Command to UTRAN handover command, Physical Channel Reconfiguration physical channel reconfiguration message, Radio Bearer). Reconfiguration radio bearer message, Radio Bearer Release radio bearer release message, Radio Bearer Setu radio bearer setup message, RRC Connection Setu radio link control connection setup message, Transport Channel Reconfiguration transport channel reconfiguration message, etc. Domain identification information.

It is also possible to configure the corresponding domain identification information in the non-buffer area, and only configure the corresponding domain identification information in the buffer area to indicate that the terminal is in the buffer. If the terminal does not receive the domain identifier information, the terminal may determine that it is in the unbuffered area, and if the terminal receives the domain identifier information, the terminal may determine that it is in the buffer area. Further, it is also possible to configure the domain label only in the unbuffered area without configuring the domain label in the buffer area. Or the unbuffered area and the corresponding device in the buffer domain do not directly send the domain identification information to the terminal, but set the boundary area between SAE/LTE and WIMAX as the buffer area 1, that is, when the terminal is located in the SAE/LTE network. In the buffer domain with the boundary of the WIMAX network, the SAE/LTE network sends a WIMAX network to the terminal (including the neighbor cell list of the WIMAX network, the WIMAX) The WIMAX network sends the network identification information of the SAE/LTE network to the terminal (including the neighbor cell list of the SAE/LTE network and the network frequency of the SAE/LTE network). And other information). When the terminal moves from the SAE/LTE network to the WIMAX network, it receives the network identification information of the WIMAX network, and the terminal senses that it has entered the boundary buffer area of the SAE/LTE network and the WIMAX network. When the terminal moves from the WIMAX network to the SAE/LTE network, it receives the network identification information of the SAE/LTE network, and the terminal senses that it has entered the boundary buffer area of the SAE/LTE network and the WIMAX network.

When the terminal moves between the SAE/LTE network and the WIMAX network, the manner of implementing IMS service continuity is similar to that of the terminal when the terminal moves between the IP network and the CS network, and the SAE/LTE network is not slow. The rushing area includes only the IMS network, and the buffer area of the SAE/LTE network includes the IMS network and the eMSC network, and the WIMAX includes the IMS network as an example for description.

Example 5: The terminal accesses from an unbuffered area (including only the IMS network):

Since the unbuffered area only includes the IMS network, the terminal registers with the IMS network. When the terminal starts to access the network from the power off state, the non-buffered area identification information is received from the broadcast channel, and the terminal directly stores the received information. Buffer area identification information;

When the terminal moves inside the unbuffered area, the unbuffered area identification information is still received from the broadcast channel, and by comparison, the domain identification information received from the broadcast channel is the same as the stored domain identification information. The terminal does not update the stored domain identifier information. By determining the domain identifier information stored in the terminal, the terminal can determine that the terminal is in the non-buffered area. At this time, the terminal still uses the IMS network of the SAE/LTE network to enjoy the voice service and the non-voice service. In a specific implementation, in the buffer domain, the terminal may receive the second IP network identifier information sent by the neighboring WIMAX (that is, the network identifier information of the WIMAX network). If the terminal receives the network identifier information of the neighboring WIMAX network, The terminal is located in the buffer domain, and the terminal updates the stored domain identifier information to the buffer area identifier information. Therefore, here, it is also possible to determine whether the terminal receives the network identification information of the WIMAX network. If the determination result here is no, the terminal does not update the stored domain identification information to the buffer area identification information. The domain identification information stored in the terminal may determine that the terminal is in an unbuffered area, and the terminal still uses the IMS network of the SAE/LTE network to enjoy voice services and non-voice services.

When the terminal moves from the unbuffered area to the buffer area, the terminal will receive the delay from the broadcast channel. By comparing the area identification information, it is known that the domain identification information received from the broadcast channel and the stored domain identification information are different. At this time, the terminal updates the domain identification information stored by the terminal to the buffer area identification information, and determines The domain identifier information stored in the terminal may determine that the terminal is located in the buffer area, and the terminal finds that it has moved from the unbuffered area to the buffer area, and the terminal establishes a tunnel to the second IP network WIMAX network in the first IP network SAE/LTE network. Initiating a VCC process, by which the IMS service of the terminal in the first IP network S AE/LTE network is switched to the IMS service in the second IP network WIMAX network. The establishing a tunnel to the IP network B in the IP network A may include: establishing, for the terminal, a communication channel to the IP network B in the IP network A; the terminal registering on the IP network B through the communication channel . In the specific implementation, it is also possible to determine whether the terminal receives the network identification information of the WIMAX network, and the determination result here is yes. At this time, the terminal updates the stored domain identification information to the buffer area identification information. The stored domain identification information may determine that the terminal is located in the buffer area, and the terminal finds that it has moved from the unbuffered area to the buffer area, and the terminal establishes a tunnel to the second IP network WIMAX network in the first IP network SAE/LTE network, and initiates The VCC process, through which the IMS service of the terminal in the first IP network SAE/LTE network is switched to the IMS service in the second IP network WIMAX network.

When the terminal moves inside the buffer area, the terminal will receive the buffer area identification information from the broadcast channel, and by comparison, the domain identifier information received from the broadcast channel is the same as the stored domain identifier information, and the terminal is The stored domain identification information is not updated. At this time, it can be determined that the terminal is located in the buffer area by judging the domain identification information stored in the terminal.

When the terminal returns from the buffer area to the unbuffered area, the terminal will receive the unbuffered area identification information from the broadcast channel, and by comparison, the domain identification information and the stored information received from the broadcast channel are known. The domain identification information is different. In this case, the terminal updates the domain identifier information stored in the terminal to the non-buffered area identifier information. At the same time, by determining the domain identifier information stored in the terminal, it can be determined that the terminal is located in the non-buffered area, and the terminal finds that it has been The buffer area is moved into the unbuffered area. When the terminal finds that its voice session is in the second IP network WIMAX, it initiates a VCC process, initiates a VCC process, and uses the tunnel to switch the IMS service of the terminal in the second IP network WIMAX network. It is the IMS service in the first IP network SAE/LTE network. In the specific implementation, it is also possible to determine whether the terminal receives the network identification information of the WIMAX network, and the determination result here is no. At this time, the terminal updates the stored domain identification information to the unbuffered area identification information. The domain identification information stored by the terminal may determine that the terminal is located in the unbuffered area, and the terminal finds that it has moved from the buffer area to the unbuffered area, when the terminal sends the When the voice session is in the second IP network WIMAX, the VCC process is initiated, and the VCC process is initiated, and the IMS service of the terminal in the second IP network WIMAX network is switched to the first IP network SAE/LTE network through the tunnel. IMS business.

When the terminal moves from the buffer area to the WIMAX network, because the terminal performs the following operations in the buffer area:

Establishing a tunnel to the second IP network WIMAX network in the first IP network SAE/LTE network, initiating a VCC process, and switching the IMS service of the terminal in the first IP network SAE/LTE network to the second IP network through the tunnel IMS service in the WIMAX network.

That is, the terminal has completely established all the contexts of the second IP network WIMAX network (ie, all handover related information), so the IMS voice is switched to the real second IP network WIMAX network by triggering the handover in the second IP network WIMAX network. go with.

When the terminal moves from the WIMAX network to the buffer area, the terminal establishes a tunnel to the first IP network SAE/LTE network in the second IP network WIMAX network, and initiates a VCC process, and the terminal is in the The IMS service in the second IP network WIMAX network is switched to the IMS service in the first IP network SAE/LTE network. When the terminal continues to move from the buffer area to the non-buffer area, refer to the above-mentioned processing flow when the terminal returns from the buffer area to the non-buffer area, as follows: The terminal will be from the broadcast channel The non-buffered area identification information is received, and the domain identification information received from the broadcast channel is different from the stored domain identification information by comparison. At this time, the terminal updates the domain identification information stored by the terminal to be unbuffered. The area identification information, and by determining the domain identification information stored by the terminal, it can be determined that the terminal is located in the unbuffered area, and the terminal finds that it has moved from the buffer area to the unbuffered area, when the terminal finds that its voice session is in the second IP network WIMAX. Initiating a VCC process, initiating a VCC process, by which the IMS service of the terminal in the second IP network WIMAX network is switched to the IMS service in the first IP network SAE/LTE network.

In a specific implementation, in addition to dividing the IP network into a buffered area and an unbuffered area, the base station system of the IP network may be upgraded, and when the base station is found to be switched to the adjacent CS domain, The base station discovers that the terminal has an active voice service, and the base station notifies the terminal to initiate a VCC process, and transfers the IMS-based voice session to the eMSC-based CS voice session, and further passes the voice through the eMSC-based CS handover process. Switch to the adjacent CS domain.

In addition, in a specific implementation, the buffer area and the non-buffer area may be divided by a TA (Tracking Area). Specifically, in the IP network (SAE/LTE or other IP networks) and The TAs of the areas adjacent to the CS circuit domain are configured as buffer areas, and the other areas are unbuffered areas. The corresponding domain identifier is configured on the MME or other core network device of the TA. When the terminal enters TA2 from TA1, when the TA update occurs, the MME or other devices in the core network notify the terminal domain to change.

In the embodiment of the present invention, when the terminal moves from the IP network to the adjacent CS network, the VCC process is initiated, and the IMS-based voice session of the terminal in the IP network is switched to the CS voice session of the eMSC; and the handover is performed. The obtained CS-based voice session is switched to a CS voice session in the neighboring CS network. The continuity of the voice session is achieved when the terminal moves between the IP-based network and the CS-based network. In the embodiment of the present invention, the terminal initiates an IMS service through the IMS, and simultaneously initiates a CS service through the eMSC to implement a CSI service.

The present invention adopts SAE/LTE: deploys eMSC in SAE/LTE to simulate dual-channel voice call continuity (Dual Radio VCC), and realizes voice continuity from SAE/LTE to 2G/3G CS through eMSC and VCC mechanisms. However, the present invention is not limited to SAE/LTE, and is also applicable to deploying a similar eMSC network mechanism in other IP networks (for example, HSPA, WIMAX, 3GPP2), simulating the CS domain to provide circuit domain services, and simulating the situation of Dual Radio, thereby solving the problem from the IP. Voice continuity between the network and the 2G/3G CS network.

Further, the application of the present invention is not limited to voice service continuity between an IP network and a CS network, and the present invention is also applicable to service continuity between IP networks (eg, HSPA, WIMAX, 3GPP2, UMB), that is, through the source network. The tunnel is established to the target network, so that the terminal can simulate the function of the target network in the source network, initiate the service based on the target network, and simulate the situation of Dual Radio, thereby solving the business continuity between the IP networks.

Correspondingly, the embodiment of the present invention provides a terminal device, and FIG. 6 is a schematic structural diagram of an embodiment of the terminal of the present invention. As shown in FIG. 6, the terminal in this embodiment includes a registration unit 6, a domain update unit 7, a session establishment unit 8, and a handover unit 9, wherein

The registration unit 6 is configured to register the terminal. In a specific implementation, when the terminal receives the network identifier from the broadcast channel, the terminal registers the network. The network identifier may be an IMS network identifier, an eMSC network identifier, or a CS network identifier.

The domain update unit 7 is configured to determine whether the received domain identifier information is the same as the domain identifier information stored by the terminal. If the determination is no, the stored domain identifier information is updated to the received domain identifier information. In order to achieve voice service continuity, the embodiment of the present invention divides the IP network into buffers. The area and the non-buffer area, the base station of the non-buffer area configures corresponding domain identification information (non-buffer area identification information), and broadcasts the domain identification information; correspondingly, the base station of the buffer area also configures corresponding domain identification information. (buffer area identification information), and broadcast the domain identification information. It is also possible to configure the corresponding domain identification information in the non-buffer area, and only configure the corresponding domain identification information in the buffer area to indicate that the terminal is in the buffer domain. When the terminal is powered on to access the network from the shutdown state, the received domain identification information is stored; when the terminal is powered on and moves in the network, the received domain identification information and the domain identification information stored in the terminal will be For comparison, if the two are different, the stored domain identification information is updated to the received domain identification information.

The switching unit 9 is configured to initiate a VCC process to switch the terminal IMS-based voice session to the eMSC domain-based CS voice session when the domain identifier information stored by the domain update unit 7 is the buffer zone identifier information, and Switching the eMSC-based CS voice session obtained by the handover to a CS voice session in the neighboring CS network.

Still referring to FIG. 6, the domain updating unit 7 further includes a receiving unit 70, a determining unit 71, a control unit 72, and a storage unit 73, where

The receiving unit 70 is configured to receive domain identification information.

The storage unit 73 is configured to store domain identification information.

The determining unit 71 is configured to determine whether the domain identifier information received by the receiving unit 70 is the same as the domain identifier information stored by the storage unit 73;

The update control unit 72 is configured to, when receiving the negative determination result output by the determination unit 71, control the storage unit 73 to update the stored domain identification information to the domain identification information received by the receiving unit 70.

a switching unit, configured to initiate a VCC process when the domain identifier information stored after the domain update unit is updated is buffered area identification information, and switch the IMS-based voice session of the terminal in the IP network to an eMSC-based voice session a CS voice session; and switching the eMSC-based CS voice session obtained by the handover to a CS voice session in the neighboring CS network.

Correspondingly, an embodiment of the present invention provides a terminal device, where the terminal device includes: a domain update unit, configured to determine whether the received domain identifier information is the same as the domain identifier information stored by the terminal, and if the determination is no, the stored domain identifier information is updated to the received domain identifier information; When the domain identification information stored by the domain update unit is buffered area identification information, a VCC process is initiated, and the CS voice session of the terminal is switched to an eMSC-based voice session in the IP network, and The eMSC-based voice session in the IP network is switched to an IMS-based voice session in the IP network.

a domain update unit, configured to: when the terminal is located in the CS network, determine whether the terminal receives the network identifier information of the IP network, and if yes, update the domain identifier information stored by the terminal to the buffer area identifier information ;

The above description is only the preferred embodiment of the present invention, and of course, the present invention cannot be limited thereto. The scope of the claims, therefore, equivalent changes made in the claims of the invention are still within the scope of the invention.

Claims

Rights request

A method for implementing voice service continuity, comprising the steps of: initiating a voice call continuity VCC process when a terminal moves from an IP network to an adjacent CS network, and placing the terminal in the IP network The voice session switching based on the IP Multimedia Subsystem IMS is a CS voice session based on the evolved mobile switching center eMSC;

Switching the eMSC-based CS voice session obtained by the handover to a CS voice session in the neighboring CS network.

2. The method for implementing voice service continuity according to claim 1, wherein the IP network comprises an IMS network and an eMSC network.

The method for implementing voice service continuity according to claim 2, wherein the IP network is divided into a buffer area and a non-buffer area, and the buffer area is adjacent to the CS network. The buffer area includes the eMSC network;

When the terminal moves from the IP network to the adjacent CS network, the VCC process is initiated, and the step of switching the IMS-based voice session of the terminal in the IP network to the eMSC-based CS voice session is:

When the terminal moves from the IP network to the adjacent CS network, it is determined whether the terminal is in the buffer area. If the determination is yes, the VCC process is initiated, and the terminal switches the IMS-based voice session in the IP network. For eMSC based CS voice sessions.

The method for implementing the continuity of the voice service according to claim 3, wherein the buffer area is configured with a buffer area identifier, and the step of determining whether the terminal is in the buffer area is :

Determining whether the domain identifier information stored by the terminal is buffered area identifier information, and if the determination is yes, indicating that the terminal is in the buffer area.

The method for implementing the continuity of the voice service according to claim 4, wherein the method further comprises:

When the terminal receives the domain identifier information, it determines whether the received domain identifier information is the same as the stored domain identifier information. If the determination is no, the stored domain identifier information is updated to the received domain identifier information.

6. The method for implementing voice service continuity according to claim 5, wherein said The punched area identification information is broadcast to the terminal by the base station in the buffer area.

The method for implementing voice service continuity according to claim 5, wherein the buffer area identification information is notified to the terminal by the base station in the buffer area by using a radio link control RRC message.

When the terminal is located in the IP network, it is determined whether the terminal receives the network identifier information of the CS network, and if the determination is yes, the domain identifier information stored by the terminal is updated to the buffer area identifier information.

The method for implementing the continuity of the voice service according to claim 8, wherein the network identifier information of the CS network includes a neighbor cell list of the CS network and network frequency information of the CS network. At least one.

The method for implementing voice service continuity according to any one of claims 1-9, wherein the voice session is a calling call session or a called call session.

A session establishing method for implementing voice service continuity, comprising: in a voice session establishment phase, when a terminal is in a buffer area of the IP network, generating an eMSC-based CS voice session.

The session establishing method for implementing voice service continuity according to claim 11, wherein the step of generating an eMSC-based CS voice session when the terminal is in the buffer area of the IP network is:

The terminal initiates an eMSC-based CS voice session.

The terminal initiates an IMS-based voice session;

After the IMS voice session is established, a VCC process is initiated to switch the IMS-based voice session to an eMSC-based CS voice session.

14. A method for implementing a CSI service, characterized in that the method comprises the following steps:

The terminal initiates an IMS service through the IMS;

The terminal initiates a CS service through the eMSC.

The method for implementing a CSI service according to claim 14, wherein when the terminal is in the buffer area, a voice service is initiated by the eMSC, and a non-voice service is initiated by the IMS.

The method for implementing a CSI service according to claim 14, wherein when the terminal is in the buffer area, the voice service of the IMS service is transferred to the eMSC network through the VCC, and the non-voice IMS service is still Running on the IMS network;

When the terminal is in the unbuffered area, the CS service of the eMSC is transferred to the IMS network through the VCC.

17. A terminal device, comprising:

a domain update unit, configured to determine whether the received domain identifier information is the same as the domain identifier information stored by the terminal, and if the determination is no, the stored domain identifier information is updated to the received domain identifier information; And when the domain identifier information stored by the domain update unit is buffered area identifier information, initiate a VCC process, and switch the IMS-based voice session of the terminal in the IP network to an eMSC-based CS voice session; Switching the eMSC-based CS voice session obtained by the handover to a CS voice session in the neighboring CS network.

The terminal device according to claim 17, wherein the domain update unit comprises: a receiving unit, configured to receive domain identification information;

a storage unit, configured to store domain identification information;

a determining unit, configured to determine whether the domain identifier information received by the receiving unit is the same as the domain identifier information stored by the storage unit;

And an update control unit, configured to: when receiving the negative determination result output by the determining unit, control the storage unit to update the stored domain identifier information to the domain identifier information received by the receiving unit.

The terminal device according to claim 17, further comprising:

A registration unit for registering a terminal.

20. A terminal device, comprising:

a switching unit, configured to initiate a VCC process when the domain identifier information stored after the domain update unit is updated is buffered area identification information, and switch the IMS-based voice session of the terminal in the IP network to an eMSC-based voice session a CS voice session; and the eMSC-based CS obtained by the handover The voice session is switched to a CS voice session in the neighboring CS network.

The terminal device according to claim 20, wherein the domain update unit comprises: a receiving unit, configured to receive network identification information;

a storage unit, configured to store domain identification information;

a determining unit, configured to determine, when the terminal is located in the IP network, whether the terminal receives network identification information of the CS network;

And an update control unit, configured to: when receiving the positive determination result output by the determining unit, control the storage unit to update the stored domain identification information to the buffer area identification information.

The terminal device according to claim 20, further comprising:

A registration unit for registering a terminal.

23. A method of implementing voice service continuity from a CS network to an IP network, characterized by comprising the steps of:

24. A method of implementing voice service continuity from a CS network to an IP network according to claim 23, wherein said IP network comprises an IMS network and an eMSC network.

The method for implementing voice service continuity from a CS network to an IP network according to claim 23, wherein the IP network is divided into a buffer area and a non-buffer area, and the buffer area is CS network adjacency, including the eMSC network in the buffer area;

When the terminal moves from the CS network to the neighboring IP network, the VCC process is initiated, and the step of switching the CS voice session of the terminal to the eMSC-based voice session in the IP network is:

When the terminal moves from the CS network to the neighboring IP network, it is determined whether the terminal is in the buffer area. If the determination is yes, the VCC process is initiated, and the CS voice session of the terminal is switched to the IP address. An eMSC-based voice session in the network.

The method for implementing the voice service continuity from the CS network to the IP network according to claim 25, wherein the buffer area is configured with a buffer area identifier, and the determining whether the terminal is in the The steps for buffering the area are:

Determining whether the domain identification information stored by the terminal is buffered area identification information, and if the determination is yes, It indicates that the terminal is in the buffer area.

The method for implementing the voice service continuity from the CS network to the IP network according to claim 26, wherein the method further comprises:

The method for implementing the voice service continuity from the CS network to the IP network according to claim 27, wherein the buffer area identification information is broadcast by the base station in the buffer area to the terminal; or The buffer area identification information is notified to the terminal by the base station in the buffer area through an RRC message.

When the terminal is located in the CS network, it is determined whether the terminal receives the network identifier information of the IP network. If the determination is yes, the domain identifier information stored by the terminal is updated to the buffer area identifier information.

The method for implementing the voice service continuity from the CS network to the IP network according to claim 29, wherein the network identity information of the IP network includes a neighbor cell list of the IP network, and the IP network At least one of the network frequency information.

The method for implementing voice service continuity from a CS network to an IP network according to any one of claims 23-30, wherein the voice session is a calling call session or a called call session.

32. A terminal device, comprising:

33. A terminal device, comprising:

a switching unit, configured to: when the domain update unit is updated, the domain identifier information stored is a buffer area label Informing the information, initiating a VCC procedure, switching the CS voice session of the terminal to an eMSC-based voice session in the IP network, and switching the eMSC-based voice session in the IP network to the IP network An IMS-based voice session.

34. A method for implementing IMS service continuity, comprising the steps of: when a terminal moves from IP network A to IP network B, the terminal establishes a tunnel to IP network B in IP network A, and initiates a VCC process. The IMS service of the terminal in the IP network A is switched to the IMS service in the IP network B through the tunnel.

The method for implementing IMS service continuity according to claim 34, wherein the IP network A is divided into a buffer area and a non-buffer area, and the buffer area is adjacent to the IP network B; When the terminal moves from the IP network A to the IP network B, the terminal establishes a tunnel to the IP network B in the IP network A, initiates a VCC process, and switches the IMS service of the terminal in the IP network A to the IP through the tunnel. The steps of the IMS service in Network B are:

When the terminal moves from the IP network A to the neighboring IP network B, it is determined whether the terminal is in the buffer area. If the determination is yes, the terminal establishes a tunnel to the IP network B in the IP network A, and initiates a VCC process. The IMS service of the terminal in the IP network A is switched to the IMS service in the IP network B through the tunnel.

The method for implementing IMS service continuity according to claim 35, wherein the buffer area is configured with a buffer area identifier, and the step of determining whether the terminal is in the buffer area is :

The method for implementing IMS service continuity according to claim 36, wherein the method further comprises:

The method for implementing IMS service continuity according to claim 37, wherein the buffer area identification information is broadcast by the base station in the buffer area to the terminal, or the buffer area identification information is The base station in the buffer area notifies the terminal through the wireless link message.

39. A method of implementing IMS service continuity as claimed in claim 38, wherein the method Also includes:

When the terminal is located in the IP network A, it is determined whether the terminal receives the network identification information of the IP network B. If the determination is yes, the domain identifier information stored by the terminal is updated to the buffer area identification information.

The method for implementing IMS service continuity according to claim 39, wherein the network identification information of the IP network B includes a neighbor cell list of the IP network B, and a network frequency of the IP network B. At least one of the point information.

The method of implementing IMS service continuity according to any one of claims 35-40, wherein the voice session is a calling call session or a called call session.

42. A terminal device, comprising:

43. A terminal device, comprising: