WO2014000615A1 - Ims网络的会话切换方法及eatf - Google Patents

Ims网络的会话切换方法及eatf Download PDF

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Publication number
WO2014000615A1
WO2014000615A1 PCT/CN2013/077798 CN2013077798W WO2014000615A1 WO 2014000615 A1 WO2014000615 A1 WO 2014000615A1 CN 2013077798 W CN2013077798 W CN 2013077798W WO 2014000615 A1 WO2014000615 A1 WO 2014000615A1
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WO
WIPO (PCT)
Prior art keywords
call
network element
media
request message
domain network
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PCT/CN2013/077798
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English (en)
French (fr)
Inventor
杨强
王忱
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US14/407,496 priority Critical patent/US9467485B2/en
Priority to RU2014149129/08A priority patent/RU2600526C2/ru
Priority to EP13809812.4A priority patent/EP2852119B1/en
Publication of WO2014000615A1 publication Critical patent/WO2014000615A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1094—Inter-user-equipment sessions transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1046—Call controllers; Call servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1093—In-session procedures by adding participants; by removing participants
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1096—Supplementary features, e.g. call forwarding or call holding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections

Definitions

  • the present invention relates to the field of communications, and in particular, to a session switching method and an emergency access switching function (EATF) entity of an IP Multimedia Subsystem (IMS) network.
  • EATF emergency access switching function
  • IMS IP Multimedia Subsystem
  • the IP Multimedia Core Network Subsystem is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP), which builds an open and flexible network.
  • 3GPP 3rd Generation Partnership Project
  • the business environment supports multimedia applications and provides users with rich multimedia services.
  • CS circuit-switched
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • the EATF entity implements signaling and process descriptions for emergency call switching between PS and CS.
  • FIG. 1 it is a signaling flowchart of a PS-CS handover process of an existing emergency call, and the process includes:
  • Step 101 The user initiates an emergency call by using the PS access.
  • Step 102 The P-CSCF routes the emergency call to the emergency call session control function (E-CSCF) according to an existing mechanism;
  • E-CSCF emergency call session control function
  • Step 103 The E-CSCF routes the call to the EATF entity.
  • Steps 104-105 the EATF entity anchors the call, and sends the call to the original E-CSCF; Steps 106-111, complete the subsequent emergency call process according to the existing mechanism;
  • Step 112 The user moves to the CS through the enhanced mobile switching center (eMSC) server
  • eMSC enhanced mobile switching center
  • Step 113 The I-CSCF routes the handover request to the EATF entity according to an existing mechanism.
  • Step 114 The EATF entity identifies that the received request (INVITE) message requests to switch an existing emergency call to exist on the other side. Session initiation media negotiation process;
  • Steps 115-117 media negotiation according to existing mechanisms
  • Steps 118-119 sending a response message to the eMSC Server, carrying the obtained remote media in the message, establishing a media channel between the user (via the CS access) and the public safety answering point (PSAP), to implement the ongoing call;
  • PSAP public safety answering point
  • Steps 120-125 The EATF entity initiates release of the original PS access side session.
  • the role and function of the EATF entity is similar to that of the service centralized and continuous application server (SCC AS) in normal call handover, and there is a handover process exposed by a single wireless voice call continuity (SR VCC) handover. Long question.
  • SCC AS service centralized and continuous application server
  • SR VCC single wireless voice call continuity
  • the embodiment of the invention provides a session switching method and an EATF entity of an IMS network, so as to solve the problem that the handover process existing in the existing handover is long.
  • An embodiment of the present invention provides a session switching method for an IP Multimedia Subsystem (IMS) network, where the method includes:
  • the Emergency Access Handover Function (EATF) entity anchors the call sent by the calling domain network element and routes the call to the emergency call session control function (E-CSCF);
  • EATF entity Receiving, by the EATF entity, a call handover request message sent by the terminating area network element; and if the EATF entity identifies that the call handover request message is a request message for requesting to switch the call, performing media negotiation, and The terminating network element sends a response message carrying the media information.
  • the step of the EATF entity performing media negotiation and sending a response message carrying the media information to the terminating area network element includes:
  • the EATF entity recognizes that the call handover request message is to request to switch the call
  • the request message the media carried in the call handover request message is used to negotiate the call originating media to obtain the remote media information, and send the response message carrying the remote media information to the terminating domain network element.
  • the method further includes: the EATF entity anchors the call sent by the calling domain network element, and anchors the media.
  • the step of the EATF entity performing media negotiation and sending a response message carrying the media information to the terminating area network element includes:
  • the EATF entity identifies that the call handover request message is a request message for requesting to switch the call
  • the media that is accessed by the call domain is replaced by the media carried in the call handover request message, and the access switch is used.
  • the gateway (ATGW) performs media negotiation to obtain the ATGW anchor media information, and sends a response message carrying the ATGW anchor media information to the terminating domain network element.
  • the calling domain network element is a proxy call session control function (P-CSCF), and the terminating call domain network element is a mobile switching center (MSC) server; or
  • the originating domain network element is an MSC server, and the terminating domain network element is a P-CSCF.
  • An embodiment of the present invention further provides an Emergency Access Handover Function (EATF) entity, including: an anchoring module configured to anchor a call sent by a calling domain network element and route the call to an emergency call session Control function (E-CSCF);
  • E-CSCF emergency call session Control function
  • a receiving module configured to receive a call handover request message sent by the terminating area network element, and a processing module configured to perform media negotiation if the call switching request message is identified as a request message for requesting to switch the call And sending a response message carrying the media information to the terminating area network element.
  • the processing module is configured to perform media negotiation by sending a response message carrying media information to the terminating area network element:
  • the media carried in the call handover request message is used to negotiate the call initiation media to obtain remote media information, and The terminating domain network element sends a response message carrying the remote media information.
  • the anchoring module is further configured to anchor the media after anchoring the call sent by the calling domain network element.
  • the processing module is configured to perform media negotiation in the following manner, and send a response message carrying the media information to the terminating domain network element:
  • the call handover request message is identified as a request message for requesting to switch the call
  • the media that is accessed by the calling domain is replaced by the media carried in the call handover request message, and the access switching gateway (ATGW) Performing media negotiation to obtain ATGW anchor media information, and transmitting a response message carrying the ATGW anchor media information to the terminating domain network element.
  • ATGW access switching gateway
  • the calling domain network element is a proxy call session control function (P-CSCF), and the terminating call domain network element is a mobile switching center (MSC) server; or
  • the originating domain network element is an MSC server, and the terminating domain network element is a P-CSCF.
  • the EATF entity is set or separated from the P-CSCF;
  • the EATF entity and the E-CSCF are set in a separate or separate setting.
  • the engineering networking and routing configuration can be simplified, the switching speed can be accelerated, and the user experience can be improved.
  • Figure 1 is a signaling flow chart of the emergency call PS-CS handover procedure
  • FIG. 2 is a signaling flow chart of an emergency call PS-CS handover procedure in an anchor media mode according to the present invention
  • FIG. 3 is a signaling flow chart of an emergency call PS-CS handover procedure in an anchorless media mode according to the present invention
  • the EATF physical network element responsible for emergency call handover is arranged in the visited domain, and the call handover can be implemented by the EATF entity according to the anchor media manner.
  • the embodiment of the invention provides a session switching method for an IMS network, and the method includes: Step 11.
  • the EATF entity anchors the call sent by the calling domain network element, and routes the call to the emergency call session control function (E-CSCF);
  • E-CSCF emergency call session control function
  • Step 12 The EATF entity receives the call handover request message sent by the network element of the terminating domain.
  • Step 13 If the EATF entity identifies that the call handover request message is a request message for requesting to switch the call, the media negotiation is performed.
  • the terminating network element sends a response message carrying the media information.
  • the calling domain network element is a proxy call session control function (P-CSCF), and the terminating domain network element is a mobile switching center (MSC) server; or the calling domain network element is an MSC server.
  • P-CSCF proxy call session control function
  • MSC mobile switching center
  • the terminating domain network element is a P-CSCF.
  • the following is a detailed description of the technical solution of the present invention by using the calling domain network element as the proxy call session control function (P-CSCF) and the terminating domain network element as the mobile switching center (MSC) server.
  • P-CSCF proxy call session control function
  • MSC mobile switching center
  • Step 201 The user initiates an emergency call by using the PS access.
  • Step 202 The P-CSCF routes the emergency call to the EATF entity.
  • Steps 203-204 the EATF entity anchors the call and the media, and routes the call to the E-CSCF;
  • Steps 205-209 completing the subsequent emergency call process according to the existing mechanism
  • Step 210 The user moves to the CS access network, and initiates an emergency call handover request to the IMS network through the eMSC Server, and routes the request to the EATF entity.
  • Step 211 The EATF entity identifies that the received INVITE message requests to switch an existing emergency call, replaces the original PS access media with the media in the INVITE message accessed by the CS, and performs media with the access switching gateway (ATGW).
  • Step 212 Send a response message to the MSC Server, where the message carries the acquired ATGW anchor media information. Establish a media channel between the user (via CS access) and the PSAP to continue the call;
  • Steps 213-216 the EATF entity initiates release of the original PS access side session.
  • the follow-up process is the same as the existing related specifications and will not be detailed here.
  • FIG. 3 it is a signaling flowchart of an emergency call PS-CS handover process in which the media mode is not anchored according to the present invention, and the process includes:
  • Step 301 The user initiates an emergency call by using the PS access.
  • Step 302 The P-CSCF routes the emergency call to the EATF entity.
  • Steps 303-304 the EATF entity anchors the call (but does not anchor the media), and routes the call to the E-CSCF;
  • Steps 305-309 completing the subsequent emergency call process according to the existing mechanism
  • Step 310 The user moves to the CS, and initiates an emergency call handover request to the IMS network by using the MSC Server, and routes the request to the EATF entity.
  • Step 311 The EATF entity identifies that the received INVITE message requests to switch to an existing emergency call, and the media in the INVITE message accessed by the CS initiates a media negotiation process to the existing session on the other side;
  • Step 312-314 media negotiation according to the existing mechanism
  • Step 315 Send a response message to the MSC Server, where the message carries the obtained remote media. Establish a media channel between the user (via CS access) and the PSAP to continue the call;
  • Steps 316-319 the EATF entity initiates release of the original PS access side session.
  • the messages between the network elements in the foregoing embodiments are mainly for clearly indicating the acquisition of the access network switching information and the idea of call handover.
  • it is not limited to these network elements and messages. There are no specific restrictions on the abnormal situations that occur in various processes, the sequence of certain messages when possible, and the specific implementations inside the network element.
  • the switching speed can be speeded up, and the user experience and satisfaction are improved.
  • FIG. 4 it is a schematic structural diagram of an EATF entity embodiment, where the EATF entity includes an anchoring module 41, a receiving module 42 and a processing module 43, where:
  • the anchoring module is configured to anchor the call sent by the calling domain network element and route the call to an emergency call session control function (E-CSCF);
  • E-CSCF emergency call session control function
  • the receiving module is configured to receive a call handover request message sent by the terminating domain network element
  • the processing module is configured to: if the call handover request message is identified as a request message for requesting to switch the call, perform media negotiation, and send a response message carrying the media information to the terminating domain network element.
  • the processing module is configured to perform media negotiation in the following manner, and send a response message carrying the media information to the terminating area network element: if the call handover request message is identified as a request message for requesting to switch the call Then, using the media carried in the call handover request message, the media is negotiated to obtain the remote media information, and the response message carrying the remote media information is sent to the terminating domain network element.
  • the anchoring module is further configured to anchor the media after anchoring the call sent by the originating network element.
  • the processing module is configured to perform media negotiation by sending a response message carrying media information to the terminating area network element: if the call handover request message is identified as a request for switching the call And replacing the media accessed by the calling domain with the media carried in the call handover request message, performing media negotiation with the ATGW to obtain the ATGW anchor media information, and transmitting the carrying the ATGW to the terminating domain network element.
  • a response message that anchors the media information is if the call handover request message is identified as a request for switching the call And replacing the media accessed by the calling domain with the media carried in the call handover request message, performing media negotiation with the ATGW to obtain the ATGW anchor media information, and transmitting the carrying the ATGW to the terminating domain network element.
  • the calling domain network element is a proxy call session control function (P-CSCF), and the terminating domain network element is a mobile switching center (MSC) server; or the calling domain network element is an MSC server.
  • the terminating domain network element is a P-CSCF.
  • the EATF entity and the P-CSCF can be set in a single or separate manner; the EATF entity and the E-CSCF can be set in a single or separate manner.
  • the switching speed can be speeded up, and user experience and satisfaction can be improved.
  • the method and the EATF entity provided by the embodiments of the present invention can make the engineering network and routing configuration simple, and can speed up the switching speed and improve the user experience.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
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Abstract

一种 IP多媒体子系统（IMS）网络的会话切换方法及EATF实体，该方法包括：紧急接入切换功能（EATF）实体将起呼域网元发送的呼叫进行锚定，并将所述呼叫路由到紧急呼叫会话控制功能（E-CSCF）；所述EATF实体接收终呼域网元发送的呼叫切换请求消息；以及所述EATF实体若识别出所述呼叫切换请求消息是为请求切换所述呼叫的请求消息，则进行媒体协商，并向所述终呼域网元发送携带媒体信息的应答消息。

Description

IMS网络的会话切换方法及 EATF
技术领域
本发明涉及通信领域， 尤其涉及 IP多媒体子系统（IMS ) 网络的会话切 换方法及紧急接入切换功能（EATF ) 实体。 背景技术
IP多媒体子系统（ IP Multimedia Core Network Subsystem, 简称 IMS )是 由第三代合作伙伴计划（ 3rd Generation Partnership Project, 简称 3GPP )组织 提出的一种基于 IP的网络架构， 其构建了一个开放而灵活的业务环境， 支持 多媒体应用， 并为用户提供丰富的多媒体业务。
目前，移动通信以电路交换（CS )网络为主，如全球移动通信系统（GSM ) 和码分多址（CDMA )等， 目前已有关于 UE通过 CS接入 IMS的规范和专 利。
在 TS 24.292、 3GPP TS 23.237和 3GPP TS 24.237等规范中已经有使用
EATF实体实现紧急呼叫在 PS与 CS之间切换的信令和流程描述。
如图 1所示， 为现有紧急呼叫 PS-CS切换过程的信令流程图， 该过程包 括：
步骤 101、 用户通过 PS接入发起紧急呼叫；
步骤 102、 P-CSCF按照现有机制将紧急呼叫路由到紧急呼叫会话控制功 能 ( E-CSCF ) ；
步骤 103、 E-CSCF将呼叫路由到 EATF实体；
步骤 104-105、 EATF实体将呼叫进行锚定， 并将呼叫发往原 E-CSCF; 步骤 106-111、 按照现有机制完成后续紧急呼叫流程；
步骤 112、 用户移动到 CS, 通过增强的移动交换中心 （eMSC )服务器
( Server ) 向 IMS 网络发起紧急呼叫切换请求， 将该请求路由到归属域的查 询 CSCF ( I-CSCF ) ； 步骤 113、 I-CSCF根据现有机制将该切换请求路由到 EATF实体； 步骤 114、 EATF 实体识别出收到的请求（INVITE ) 消息请求切换某一 已经存在的紧急呼叫， 向另一侧已存在的会话发起媒体协商流程；
步骤 115-117、 按现有机制实现媒体协商；
步骤 118-119、给 eMSC Server发应答消息， 在该消息中携带获取的远端 媒体， 建立用户 （通过 CS接入）与公共安全应答点 （PSAP )之间的媒体通 道， 实现继续通话；
步骤 120-125、 EATF实体发起释放原 PS接入侧会话。
后续流程与现有相关规范相同， 此处不详述。
但相关技术存在以下问题： EATF 实体的角色和功能与普通呼叫切换中 的业务集中和连续应用服务器（SCC AS )相似， 会存在单一无线语音呼叫连 续性（SR VCC )切换所暴露的切换过程较长的问题。
发明内容
本发明实施例提供了一种 IMS网络的会话切换方法及 EATF实体， 以解 决现有切换所存在的切换过程较长的问题。
本发明实施例提供了一种 IP多媒体子系统（ IMS )网络的会话切换方法， 该方法包括：
紧急接入切换功能（EATF )实体将起呼域网元发送的呼叫进行锚定， 并 将所述呼叫路由到紧急呼叫会话控制功能（E-CSCF ) ；
所述 EATF实体接收终呼域网元发送的呼叫切换请求消息； 以及 所述 EATF实体若识别出所述呼叫切换请求消息是为请求切换所述呼叫 的请求消息， 则进行媒体协商， 并向所述终呼域网元发送携带媒体信息的应 答消息。
所述 EATF实体进行媒体协商并向所述终呼域网元发送携带媒体信息的 应答消息的步骤包括：
所述 EATF实体若识别出所述呼叫切换请求消息是为请求切换所述呼叫 的请求消息， 则釆用所述呼叫切换请求消息中携带的媒体向所述呼叫发起媒 体协商获得远端媒体信息， 并向所述终呼域网元发送携带所述远端媒体信息 的应答消息。
该方法还包括： 所述 EATF实体将起呼域网元发送的呼叫进行锚定后， 将媒体进行锚定。
所述 EATF实体进行媒体协商并向所述终呼域网元发送携带媒体信息的 应答消息的步骤包括：
所述 EATF实体若识别出所述呼叫切换请求消息是为请求切换所述呼叫 的请求消息， 则釆用所述呼叫切换请求消息中携带的媒体替换起呼域接入的 媒体， 与接入切换网关 （ATGW )进行媒体协商获得 ATGW锚定媒体信息， 并向所述终呼域网元发送携带所述 ATGW锚定媒体信息的应答消息。
所述起呼域网元为代理呼叫会话控制功能（P-CSCF ) , 所述终呼域网元 为移动交换中心 （MSC )服务器； 或者
所述起呼域网元为 MSC服务器， 所述终呼域网元为 P-CSCF。
本发明实施例还提供一种紧急接入切换功能（EATF ) 实体， 包括： 锚定模块， 其设置成将起呼域网元发送的呼叫进行锚定， 并将所述呼叫 路由到紧急呼叫会话控制功能（E-CSCF ) ；
接收模块， 其设置成接收终呼域网元发送的呼叫切换请求消息； 以及 处理模块， 其设置成若识别出所述呼叫切换请求消息是为请求切换所述 呼叫的请求消息， 则进行媒体协商， 并向所述终呼域网元发送携带媒体信息 的应答消息。
所述处理模块是设置成通过以下方式进行媒体协商， 并向所述终呼域网 元发送携带媒体信息的应答消息：
若识别出所述呼叫切换请求消息是为请求切换所述呼叫的请求消息， 则 釆用所述呼叫切换请求消息中携带的媒体向所述呼叫发起媒体协商获得远端 媒体信息， 并向所述终呼域网元发送携带所述远端媒体信息的应答消息。
所述锚定模块还设置成在将起呼域网元发送的呼叫进行锚定之后， 将媒 体进行锚定。 所述处理模块是设置成通过以下方式进行媒体协商， 并向所述终呼域网 元发送携带媒体信息的应答消息：
若识别出所述呼叫切换请求消息是为请求切换所述呼叫的请求消息， 则 釆用所述呼叫切换请求消息中携带的媒体替换起呼域接入的媒体， 与接入切 换网关（ATGW )进行媒体协商获得 ATGW锚定媒体信息， 并向所述终呼域 网元发送携带所述 ATGW锚定媒体信息的应答消息。
所述起呼域网元为代理呼叫会话控制功能（P-CSCF ) , 所述终呼域网元 为移动交换中心 （MSC )服务器； 或者
所述起呼域网元为 MSC服务器， 所述终呼域网元为 P-CSCF。
所述 EATF实体与所述 P-CSCF合一设置或分离设置； 或者
所述 EATF实体和所述 E-CSCF合一设置或分离设置。
釆用本发明实施例， 可以让工程组网与路由配置简便， 更能加快切换速 度， 提高用户感受。 附图概述
图 1为有关紧急呼叫 PS-CS切换过程的信令流程图；
图 2为本发明锚定媒体方式的紧急呼叫 PS-CS切换过程的信令流程图； 图 3为本发明不锚定媒体方式的紧急呼叫 PS-CS切换过程的信令流程图； 图 4为本发明 EATF实体实施例的结构示意图。 本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互任意组合。
本发明实施例是将负责紧急呼叫切换的 EATF实体网元布置于拜访域， 而且可以用 EATF实体按照锚定媒体方式实现呼叫切换。
本发明实施例提供了一种 IMS网络的会话切换方法， 该方法包括： 步骤 11、 EATF实体将起呼域网元发送的呼叫进行锚定， 并将所述呼叫 路由到紧急呼叫会话控制功能（E-CSCF ) ；
步骤 12、 EATF实体接收终呼域网元发送的呼叫切换请求消息； 步骤 13、 EATF实体若识别出所述呼叫切换请求消息是为请求切换所述 呼叫的请求消息， 则进行媒体协商， 向所述终呼域网元发送携带媒体信息的 应答消息。
其中， 所述起呼域网元为代理呼叫会话控制功能（P-CSCF ) , 所述终呼 域网元为移动交换中心 （MSC )服务器； 或者， 所述起呼域网元为 MSC服 务器， 所述终呼域网元为 P-CSCF。
下面以起呼域网元为代理呼叫会话控制功能（P-CSCF ) , 终呼域网元为 移动交换中心 （MSC )服务器为例， 对本发明的技术方案进行详细描述： 如图 2所示， 为本发明锚定媒体方式的紧急呼叫 PS-CS切换过程的信令 流程图， 该过程包括：
步骤 201、 用户通过 PS接入发起紧急呼叫；
步骤 202、 P-CSCF将紧急呼叫路由到 EATF实体；
步骤 203-204、 EATF 实体将呼叫和媒体进行锚定， 并将呼叫路由到 E-CSCF;
步骤 205-209、 按照现有机制完成后续紧急呼叫流程；
步骤 210、用户移动到 CS接入网，通过 eMSC Server向 IMS网络发起紧 急呼叫切换请求， 将该请求路由到 EATF实体；
步骤 211、 EATF实体识别出收到的 INVITE消息请求切换某一已经存在 的紧急呼叫， 用 CS接入的 INVITE消息中的媒体替换原 PS接入媒体， 并与 接入切换网关 （ATGW )进行媒体协商；
步骤 212、给 MSC Server发应答消息，在该消息中携带获取的 ATGW锚 定媒体信息。 建立用户 （通过 CS接入）与 PSAP之间的媒体通道， 实现继续 通话；
步骤 213-216、 EATF实体发起释放原 PS接入侧会话。 后续流程与现有相关规范相同， 此处不详述。
如图 3所示， 为本发明不锚定媒体方式的紧急呼叫 PS-CS切换过程的信 令流程图， 该过程包括：
步骤 301、 用户通过 PS接入发起紧急呼叫；
步骤 302、 P-CSCF将紧急呼叫路由到 EATF实体；
步骤 303-304、 EATF实体将呼叫锚定（但不锚定媒体） ， 并将呼叫路由 到 E-CSCF;
步骤 305-309、 按照现有机制完成后续紧急呼叫流程；
步骤 310、 用户移动到 CS, 通过 MSC Server向 IMS网络发起紧急呼叫 切换请求， 将该请求路由到 EATF实体；
步骤 311、 EATF实体识别出收到的 INVITE消息请求切换某一已经存在 的紧急呼叫，用 CS接入的 INVITE消息中的媒体向另一侧已存在的会话发起 媒体协商流程；
步骤 312-314、 按现有机制实现媒体协商；
步骤 315、给 MSC Server发应答消息，在该消息中携带获取的远端媒体。 建立用户 （通过 CS接入）与 PSAP之间的媒体通道， 实现继续通话；
步骤 316-319、 EATF实体发起释放原 PS接入侧会话。
后续流程与现有相关规范相同， 此处不详述。
需要说明的是， 上述实施例的流程为示意流程， 具体的消息及其流程遵 循 SIP规范。该机制也适用于用户从 CS漫游到 PS实现紧急呼叫 CS-PS切换。
另外， 使用有关技术实现 E-CSCF与 LRF之间的交互， 没有在示意流程 中体现。
上述实施例中各个网元之间的消息， 主要是为了清楚地表示接入网切换 信息的获取以及呼叫切换的思想。 在具体的实现中， 不局限于这些网元和消 息。 对于各种流程中出现的异常情况、在可以的情况下某些消息的先后顺序、 网元内部的具体实现并不做具体的限制。
釆用该 IMS网络的会话切换方法， 更能加快切换速度， 提高用户体验度 和满意度。
如图 4所示， 为本发明 EATF实体实施例的结构示意图， 该 EATF实体 包括锚定模块 41、 接收模块 42和处理模块 43 , 其中：
锚定模块设置成将起呼域网元发送的呼叫进行锚定， 并将所述呼叫路由 到紧急呼叫会话控制功能（ E-CSCF ) ；
接收模块设置成接收终呼域网元发送的呼叫切换请求消息；
处理模块设置成： 若识别出所述呼叫切换请求消息是为请求切换所述呼 叫的请求消息， 则进行媒体协商， 并向所述终呼域网元发送携带媒体信息的 应答消息。
其中， 所述处理模块是设置成通过以下方式进行媒体协商， 并向终呼域 网元发送携带媒体信息的应答消息： 若识别出所述呼叫切换请求消息是为请 求切换所述呼叫的请求消息， 则釆用所述呼叫切换请求消息中携带的媒体向 所述呼叫发起媒体协商获得远端媒体信息， 并向所述终呼域网元发送携带所 述远端媒体信息的应答消息。
另外，所述锚定模块还设置成在将起呼域网元发送的呼叫进行锚定之后， 将媒体进行锚定。 此时， 所述处理模块是设置成通过以下方式进行媒体协商， 并向终呼域网元发送携带媒体信息的应答消息： 若识别出所述呼叫切换请求 消息是为请求切换所述呼叫的请求消息， 则釆用所述呼叫切换请求消息中携 带的媒体替换起呼域接入的媒体， 与 ATGW进行媒体协商获得 ATGW锚定 媒体信息，并向所述终呼域网元发送携带所述 ATGW锚定媒体信息的应答消 息。
优选地， 所述起呼域网元为代理呼叫会话控制功能（P-CSCF ) , 所述终 呼域网元为移动交换中心（MSC )服务器； 或者， 所述起呼域网元为 MSC服 务器， 所述终呼域网元为 P-CSCF。 在实现中， EATF实体和 P-CSCF既可以合一设置 ,也可以分离设置； EATF 实体和 E-CSCF既可以合一设置， 也可以分离设置。
釆用该 EATF实体， 更能加快切换速度， 提高用户体验度和满意度。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 上述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
以上实施例仅用以说明本发明的技术方案而非限制， 仅仅参照较佳实施 例对本发明进行了详细说明。 本领域的普通技术人员应当理解， 可以对本发 明的技术方案进行修改或者等同替换， 而不脱离本发明技术方案的精神和范 围， 均应涵盖在本发明的权利要求范围当中。
工业实用性
与现有技术相比， 本发明实施例所提供的方法和 EATF实体可以让工程 组网与路由配置简便， 更能加快切换速度， 提高用户感受。

Claims

权 利 要 求 书
1、 一种 IP多媒体子系统（IMS ) 网络的会话切换方法， 包括： 紧急接入切换功能（EATF )实体将起呼域网元发送的呼叫进行锚定， 并 将所述呼叫路由到紧急呼叫会话控制功能（E-CSCF ) ；
所述 EATF实体接收终呼域网元发送的呼叫切换请求消息； 以及 所述 EATF实体若识别出所述呼叫切换请求消息是为请求切换所述呼叫 的请求消息， 则进行媒体协商， 并向所述终呼域网元发送携带媒体信息的应 答消息。
2、 根据权利要求 1所述的方法， 其中，
所述 EATF实体进行媒体协商并向所述终呼域网元发送携带媒体信息的 应答消息的步骤包括：
所述 EATF实体若识别出所述呼叫切换请求消息是为请求切换所述呼叫 的请求消息， 则釆用所述呼叫切换请求消息中携带的媒体向所述呼叫发起媒 体协商获得远端媒体信息， 并向所述终呼域网元发送携带所述远端媒体信息 的应答消息。
3、 根据权利要求 1所述的方法， 还包括：
所述 EATF实体将起呼域网元发送的呼叫进行锚定后，将媒体进行锚定。
4、 根据权利要求 3所述的方法， 其中， 所述 EATF实体进行媒体协商并 向所述终呼域网元发送携带媒体信息的应答消息的步骤包括：
所述 EATF实体若识别出所述呼叫切换请求消息是为请求切换所述呼叫 的请求消息， 则釆用所述呼叫切换请求消息中携带的媒体替换起呼域接入的 媒体， 与接入切换网关 （ATGW )进行媒体协商获得 ATGW锚定媒体信息， 并向所述终呼域网元发送携带所述 ATGW锚定媒体信息的应答消息。
5、 根据权利要求 1-4任一权利要求所述的方法， 其中，
所述起呼域网元为代理呼叫会话控制功能（P-CSCF ) , 所述终呼域网元 为移动交换中心 （MSC )服务器； 或者
所述起呼域网元为 MSC服务器， 所述终呼域网元为 P-CSCF。
6、 一种紧急接入切换功能（EATF ) 实体， 包括：
锚定模块， 其设置成将起呼域网元发送的呼叫进行锚定， 并将所述呼叫 路由到紧急呼叫会话控制功能（E-CSCF ) ；
接收模块， 其设置成接收终呼域网元发送的呼叫切换请求消息； 以及 处理模块， 其设置成若识别出所述呼叫切换请求消息是为请求切换所述 呼叫的请求消息， 则进行媒体协商， 并向所述终呼域网元发送携带媒体信息 的应答消息。
7、 根据权利要求 6所述的 EATF实体， 其中，
所述处理模块是设置成通过以下方式进行媒体协商， 并向所述终呼域网 元发送携带媒体信息的应答消息：
若识别出所述呼叫切换请求消息是为请求切换所述呼叫的请求消息， 则 釆用所述呼叫切换请求消息中携带的媒体向所述呼叫发起媒体协商获得远端 媒体信息， 并向所述终呼域网元发送携带所述远端媒体信息的应答消息。
8、 根据权利要求 6所述的 EATF实体， 其中，
所述锚定模块还设置成在将起呼域网元发送的呼叫进行锚定之后， 将媒 体进行锚定。
9、 根据权利要求 8所述的 EATF实体， 其中，
所述处理模块是设置成通过以下方式进行媒体协商， 并向所述终呼域网 元发送携带媒体信息的应答消息：
若识别出所述呼叫切换请求消息是为请求切换所述呼叫的请求消息， 则 釆用所述呼叫切换请求消息中携带的媒体替换起呼域接入的媒体， 与接入切 换网关（ATGW )进行媒体协商获得 ATGW锚定媒体信息， 并向所述终呼域 网元发送携带所述 ATGW锚定媒体信息的应答消息。
10、 根据权利要求 6-9任一权利要求所述的 EATF实体， 其中， 所述起呼域网元为代理呼叫会话控制功能（P-CSCF ) , 所述终呼域网元 为移动交换中心 （MSC )服务器； 或者
所述起呼域网元为 MSC服务器， 所述终呼域网元为 P-CSCF。
11、 根据权利要求 10所述的 EATF实体， 其中，
所述 EATF实体与所述 P-CSCF合一设置或分离设置； 或者 所述 EATF实体和所述 E-CSCF合一设置或分离设置。
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US20150163255A1 (en) 2015-06-11
US9467485B2 (en) 2016-10-11
CN102739669A (zh) 2012-10-17
RU2014149129A (ru) 2016-08-10
EP2852119A1 (en) 2015-03-25

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