WO2012097718A1 - 移动交换中心获取ims控制点信息的方法及系统 - Google Patents

移动交换中心获取ims控制点信息的方法及系统 Download PDF

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Publication number
WO2012097718A1
WO2012097718A1 PCT/CN2012/070429 CN2012070429W WO2012097718A1 WO 2012097718 A1 WO2012097718 A1 WO 2012097718A1 CN 2012070429 W CN2012070429 W CN 2012070429W WO 2012097718 A1 WO2012097718 A1 WO 2012097718A1
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Prior art keywords
control point
ims control
mobile switching
ims
switching center
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PCT/CN2012/070429
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English (en)
French (fr)
Inventor
谢振华
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中兴通讯股份有限公司
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Publication of WO2012097718A1 publication Critical patent/WO2012097718A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1016IP multimedia subsystem [IMS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/102Gateways

Definitions

  • the present invention relates to an IMS (IP Multimedia Subsystem), and more particularly to a method and system for an MSC (Mobile Switching Center) to acquire ICP (IMS Control Point) information.
  • IMS IP Multimedia Subsystem
  • MSC Mobile Switching Center
  • ICP IMS Control Point
  • IMS is an IP-based network architecture proposed by 3GPP (3rd Generation Partnership Project), which builds an open and flexible business environment, supports multimedia applications, and provides users with rich multimedia. business.
  • control layer In the IMS service system, the control layer and the service layer are separated.
  • the control layer does not provide specific services, and only provides the necessary triggering, routing, and accounting functions to the service layer.
  • CSCF Call Session Control Function
  • Proxy CSCF Proxy-Call Session Control Function
  • I-CSCF Interrogating-Call Session Control Function
  • Query CSCF Query CSCF
  • S-CSCF Serving CSCF
  • S-CSCF Serving CSCF
  • IBCF IB Boundary Control Function
  • ATCF Access Transfer Control Function
  • the business layer consists of a series of ASs (Application Servers) and provides specific business services.
  • the AS can be a separate entity or it can exist in the S-CSCF.
  • the S-CSCF controls the service trigger according to the subscription information of the user, invokes the service on the AS, and implements the service function.
  • the end-to-end device in the session is called UE (User Equipment) and is responsible for interaction with the user.
  • Some UEs have multiple ways to access the mobile network, such as accessing the mobile network through the PS (Packet Switch) domain of the 3GPP mobile network, through non-3GPP mobile networks (such as CDMA (Code Division Multiple Access) IX or Wimax
  • PS Packet Switch
  • CDMA Code Division Multiple Access
  • Wimax Wimax
  • the PS domain of the (Worldwide Interoperability for Microwave Access) network accesses the mobile network, and can even access the mobile network through the CS (Circuit Switch) domain of the mobile network.
  • CS Circuit Switch
  • the mobile network includes a base station subsystem and a core network
  • the core network element may be an SGSN (Serving GPRS Support Node), a GGSN (Gateway GPRS Support Node), an MME (Mobile Management Entity), an MSC, a PCF (Packet Control Function), or a PDSN ( Packet data service node) and so on.
  • the MSC needs to obtain the ICP information
  • the ICP may be an entity having an IMS signaling control function, such as a P-CSCF, an I-CSCF, an IBCF, an ATCF, or an AS. It can even be an MSC with IMS signaling capabilities.
  • the obtaining process includes: Step 101: The UE sends an attach request to the mobile network, for example, sending an attach request message to the base station subsystem serving itself;
  • the base station subsystem may be a base station system (BSS, Base Station System) or a radio network controller (RNC).
  • BSS Base Station System
  • RNC radio network controller
  • Step 102 The base station subsystem sends an attach request message to the MSC.
  • Step 103 After receiving the attach request message, the MSC allows the UE to attach and use the mobile network, and then sends an allow attach message to the UE, such as an Attach Accept message, which allows the attach message to pass through the base station subsystem.
  • an allow attach message such as an Attach Accept message
  • Step 104 The base station subsystem will allow the attach message to be sent to the UE.
  • Step 105 After the MSC allows the UE to attach and use the mobile network, initiate a registration request to the UE's home IMS network, for example, send a Register message to the S-CSCF in the UE's home IMS network, and the registration message belongs to the IMS signaling.
  • Step 106 The S-CSCF allows the UE to access the IMS network, and then returns a registration response to the MSC, such as sending a "200 OK" message, which belongs to the IMS signaling.
  • Step 107 The UE initiates a registration request to the UE's home IMS network through the access service and the P-CSCF provided by the PS domain, for example, sends a Register message to the P-CSCF to use the service provided by the IMS network; wherein, the Register message belongs to the IMS message. make.
  • Step 108a After receiving the registration request, the P-CSCF selects the ICP serving the UE and forwards the registration request to the ICP.
  • Step 109a After receiving the registration request, the ICP sends another registration request to the S-CSCF, where the other registration request carries the ICP information, where the ICP information may be directly located, such as the ICP number, address, or identifier. It may also be information for indirectly locating the ICP, such as an index of the ICP, or any combination of the above various information.
  • the ICP information may be directly located, such as the ICP number, address, or identifier. It may also be information for indirectly locating the ICP, such as an index of the ICP, or any combination of the above various information.
  • Step 110a The S-CSCF allows the UE to access the IMS network and use the services provided by the IMS network, and then returns a registration response, such as sending a "200 OK" message, which belongs to the IMS signaling.
  • Step 111a The registration response arrives at the ICP, and the ICP forwards the registration response to the P-CSCF. If the ICP is on the P-CSCF, then steps 108a-l l la are simplified to:
  • the P-CSCF After receiving the registration request, the P-CSCF sends another registration request to the S-CSCF, and the other registration request carries the ICP information.
  • the S-CSCF allows the UE to access the IMS network and use the services provided by the IMS network, and then returns a registration response to the P-CSCF, such as sending a "200 OK" message, which belongs to the IMS signaling.
  • steps 108a-l l la are simplified to:
  • the P-CSCF After receiving the registration request, the P-CSCF forwards the registration request to the S-CSCF.
  • the S-CSCF allows the UE to access the IMS network and use the services provided by the IMS network, and then returns a registration response to the P-CSCF, such as sending a "200 OK" message, which belongs to the IMS signaling.
  • Step 108b After receiving the registration request, the P-CSCF forwards the registration request to the S-CSCF.
  • Step 110b The S-CSCF forwards the registration request to the ICP.
  • Step 111b After receiving the registration request, the ICP returns a registration response to the S-CSCF, where the registration response carries the ICP information, where the ICP information may be directly located, such as the ICP number, address, or identifier, or Indirect positioning of ICP information, such as an ICP index, can also be any combination of the above various information.
  • the ICP information may be directly located, such as the ICP number, address, or identifier, or Indirect positioning of ICP information, such as an ICP index, can also be any combination of the above various information.
  • Step 112 After receiving the registration response of step 111a or 109b, the P-CSCF forwards the registration response to the UE.
  • Step 113 After obtaining the ICP information, the S-CSCF notifies the MSC of the obtained ICP information, for example, sends a Notify message to the MSC, where the Notify message carries the obtained ICP information, and the Notify message belongs to the IMS signaling.
  • the MSC must support the IMS signaling and complete the registration process instead of the UE to obtain the ICP information. If the MSC does not support the IMS signaling, in order to be able to apply the process shown in FIG.
  • the new interface and protocol enable the MSC to interact with the S-CSCF, so the application scenarios of the above process are limited. Summary of the invention
  • the main object of the present invention is to provide a method for an MSC to acquire ICP information. And the system, so that MSC can obtain ICP information without adding new interfaces and protocols.
  • the technical solution of the present invention is achieved as follows:
  • a method for a mobile switching center to obtain IMS control point information comprising: providing, by an application server, IMS control point information to a serving GPRS support node; after receiving the inquiry from the mobile switching center, the serving GPRS support node The IMS control point information is sent to the mobile switching center.
  • the method further includes: the IMS control point passing the IMS control point information through the IMS process Sent to the application server.
  • the application server provides the IMS control point information to the serving GPRS support node as:
  • the application server sends an update message carrying the IMS control point information to the home subscriber server; the home subscriber server sends a notification message carrying the IMS control point information to the serving GPRS support node.
  • the method further includes: the mobile switching center receiving the call request or the handover request.
  • a system for acquiring information of an IMS control point by a mobile switching center comprising: an application server, a service GPRS support node, and a mobile switching center;
  • An application server configured to provide IMS control point information to a serving GPRS support node; a mobile switching center, configured to query the serving GPRS support node for IMS control point information; and a monthly service GPRS support node, configured to receive from the mobile switching center After the inquiry, the IMS control point information is sent to the mobile switching center.
  • the application server is further configured to: when the IMS control point is not on the application server, receive the IMS control point information sent by the IMS control point by using an IMS process.
  • system further includes: a home subscriber server, configured to receive an update message that is sent by the application server and that carries the IMS control point information, and send a notification message that carries the IMS control point information to The serving GPRS support node.
  • a home subscriber server configured to receive an update message that is sent by the application server and that carries the IMS control point information, and send a notification message that carries the IMS control point information to The serving GPRS support node.
  • the mobile switching center is further configured to: receive a call request or a handover request before inquiring the IMS control point information to the serving GPRS support node.
  • the ICP information is provided by the SGSN to the MSC, so the MSC can not support the IMS signaling, and can obtain the ICP information without adding a new interface and protocol, so the present invention can Apply to more application scenarios.
  • FIG. 2 is a flowchart of an MSC acquiring ICP information according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of an MSC acquiring ICP information according to Embodiment 2 of the present invention.
  • FIG. 4 is a structural diagram of a system for an MSC to acquire ICP information according to an embodiment of the present invention. detailed description
  • FIG. 2 is a flowchart of the MSC acquiring the ICP information according to the first embodiment of the present invention, and describes a process in which the UE anchors the CS call in the IMS domain after the UE initiates the call in the CS domain, and the process includes:
  • Step 201 The UE initiates a registration request to the IMS network through the PS domain, for example, sending a Register message.
  • Step 202 The registration request passes through the P-CSCF, and the P-CSCF forwards the registration request to the ICP.
  • the information of the ICP such as the index of the ICP, can also be any combination of the above various information.
  • Step 204 The S-CSCF allows the UE to access the IMS network, and then returns a registration response, such as sending a "200 OK" message.
  • Step 205 After receiving the registration response, the ICP forwards the registration response to the P-CSCF.
  • Step 206 After receiving the registration response, the P-CSCF forwards the registration response to the UE.
  • Steps 202-206 describe the case where the ICP is between the P-CSCF and the S-CSCF, such as the ICP on the IBCF or the MSC; wherein the MSC here may be the MSC to which the UE is attached (ie, the MSC shown in FIG. 2) It can also be other MSCs. If the ICP is on the MSC to which the UE is attached, since the ICP is a separate functional entity, steps 202-206 and subsequent steps 213-215 are unchanged.
  • steps 202-206 are simplified to:
  • the P-CSCF After receiving the registration request, the P-CSCF forwards another registration request to the S-CSCF, where the other registration request carries the ICP information;
  • the S-CSCF allows the UE to access the IMS network, and then returns a registration response, such as sending a "200 OK" message;
  • the P-CSCF After receiving the registration response, the P-CSCF forwards the registration response to the UE.
  • steps 202-206 are simplified to:
  • the registration request passes through the P-CSCF, and the P-CSCF forwards the registration request to the S-CSCF;
  • the S-CSCF allows the UE to access the IMS network, and then returns a registration response
  • the P-CSCF After receiving the registration response, the P-CSCF forwards the registration response to the UE.
  • the above steps belong to the IMS registration process.
  • IMS message interaction processes between the UE and the IMS network, such as the UE initiates an IMS call process, and the IMS call request Invite.
  • the ICP (the ICP is not on the S-CSCF) can also carry the ICP information in the Invite message forwarded to the S-CSCF.
  • Step 207 The S-CSCF forwards the registration request carrying the ICP information to the AS according to the subscription information of the UE.
  • the S-CSCF forwards the Invite message carrying the ICP information to the AS.
  • Step 208 The AS returns a registration response to the S-CSCF, for example, sending a "200 OK" message.
  • Step 210 The UE sends a call request to the MSC in the CS domain, for example, sending a Setup message.
  • Step 211 After receiving the call request, the MSC queries the SGSC for ICP information, such as sending an Identity Request message.
  • Step 212 The SGSN returns a response carrying the ICP information, for example, sending an Identity Response message carrying the ICP information.
  • the MSC obtained the ICP information.
  • Step 213 The MSC sends a call request to the ICP according to the ICP information, for example, sending an IAM (Initial Address Message) when the MSC does not support the IMS signaling, or sending an Invite message when the MSC supports the IMS signaling.
  • IAM Initial Address Message
  • Step 214 The ICP continues the subsequent IMS call process.
  • Step 215 After receiving the response of the called party, the ICP sends a call response to the MSC, for example, sending an ANM (Answer Message) or a "200 OK" message.
  • ANM Answer Message
  • Step 216 The MSC sends a call response to the UE, for example, sending a Connect. If the ICP is on the AS, the ICP information sent by the AS to the SGSN in step 209 is Generated by the AS, rather than being forwarded by the S-CSCF, and steps 202-208 become: the registration request passes through the P-CSCF, and the P-CSCF forwards the registration request to the S-CSCF;
  • the S-CSCF allows the UE to access the IMS network and returns a registration response, such as sending "200"
  • the P-CSCF After receiving the registration response, the P-CSCF forwards the registration response to the UE;
  • the S-CSCF forwards the registration request to the AS according to the subscription information of the UE;
  • the AS returns a registration response to the S-CSCF, such as sending a "200 OK" message.
  • FIG. 3 is a flowchart of the MSC acquiring the ICP information according to the second embodiment of the present invention, and describes a process in which the UE in the CS domain is transferred to the PS domain, and the MSC notifies the ICP to start the transfer process, the process includes:
  • Steps 301-308 The same as steps 201-208 in FIG. 2, and details are not described herein again.
  • Step 309 The AS sends an update message carrying the ICP information to the HSS (Home).
  • the home subscriber server for example, sends a Sh-push (Sh-Push) message carrying ICP information.
  • Sh-push Sh-Push
  • the ICP information is generated by the AS; otherwise, the ICP information is forwarded to the AS by the S-CSCF.
  • Step 310 The HSS sends a notification message carrying the ICP information to the SGSN, for example, sending a Insert Subscriber Data message carrying the ICP information.
  • Steps 309-310 can also be replaced by step 209 in FIG.
  • Step 311 The UE has a session in the CS domain. For example, the UE initiates a call in the CS domain or accepts a call in the CS domain but has a session.
  • the base station subsystem decides to switch the CS domain session of the UE to the PS domain, and then The MSC sends a handover request, triggering the CS domain to the PS The process of switching the domain, such as sending a Handover Request message or a Relocation Request message.
  • Step 312 After receiving the handover request, the MSC queries the SGSC for ICP information, such as sending an Identity Request message.
  • Step 313 The SGSN returns a response carrying the ICP information, for example, sending an Identity Response message carrying the ICP information.
  • the MSC obtained the ICP information.
  • Step 314 The MSC sends a transfer request to the ICP according to the ICP information, for example, when the MSC does not support the IMS signaling, or sends an Invite message when the MSC supports the IMS signaling.
  • Step 315 The ICP returns a transfer response to the MSC, such as sending a "200 OK" message.
  • Step 317 The ICP initiates a process of reestablishing a media connection between the ICP-controlled media gateway and the remote UE, for example, sending a relvvite message to the remote UE, or sending an Invite message to the AS, and sending the rernvite message to the remote UE by the AS. .
  • a relvvite message to the remote UE
  • an Invite message to the AS
  • the rernvite message to the remote UE by the AS.
  • Step 318 After step 316, the UE modulates into the PS domain and accesses the IMS network through the PS domain.
  • Step 319 The UE initiates a transfer request in the PS domain, for example, sending an Invite message or a relnvite message.
  • Step 320 After receiving the transfer request, the ICP returns a transfer response to the UE, for example, sending a "200 OK" message.
  • Step 321 The ICP establishes a media connection between the ICP-controlled media gateway and the UE according to the UE-initiated transfer request, and enables the UE to continue and the remote end in the PS domain through the bridge function of the ICP.
  • the UE conducts a session.
  • the process after the step 313 in the second embodiment may have other implementations.
  • the second embodiment only illustrates the implementation of one of the cases, but the process after the step 313 does not affect the process between the steps 301-313.
  • an embodiment of the present invention further provides a system for an MSC to acquire ICP information.
  • the system includes: an AS, an SGSN, and an MSC;
  • An MSC configured to query the SGSN for IMS control point information
  • the SGSN is configured to send the ICP information to the MSC after receiving the inquiry from the MSC.
  • the AS is further configured to: when the ICP is not on the AS, receive the ICP information sent by the ICP through an IMS process. For details on how the ICP sends ICP information to the AS through the IMS process, refer to steps 203-207, and details are not described here.
  • the system further includes: an HSS, configured to receive an update message sent by the AS and carry the ICP information, and send a notification message carrying the ICP information to the
  • the mobile switching center is further configured to: receive a call request or a handover request before inquiring the SGSN with the ICP information.

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Description

移动交换中心获取 IMS控制点信息的方法及系统 技术领域
本发明涉及 IMS ( IP Multimedia Subsystem, IP多媒体子系统), 尤其 涉及一种 MSC (移动交换中心)获取 ICP ( IMS控制点)信息的方法及系 统。 背景技术
IMS是由 3GPP ( 3rd Generation Partnership Project, 第三代合作伙 伴计划)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, 并能够为用户提供丰富的多媒体业务。
在 IMS业务体系中, 控制层和业务层是分离的, 控制层不提供具体 业务, 只向业务层提供必要的触发、 路由和计费等功能。
控制层中业务触发和控制功能是由 CSCF ( Call Session Control Function, 呼叫会话控制功能) 完成的。 CSCF 分为三种类型: P-CSCF ( Proxy-Call Session Control Function , 代理 CSCF ) 、 I-CSCF ( Interrogating-Call Session Control Function, 查询 CSCF ) 和 S-CSCF ( Serving-Call Session Control Function, 服务 CSCF ) ; 其中, S-CSCF 负主要责任, I-CSCF是可选的。 除此之外, IMS业务体系中还有一些辅 助网元, 如 IBCF ( IMS边界控制功能) 和 ATCF (访问转移控制功能 ) 等。
业务层由一系列 AS ( Application Server, 应用服务器)组成, 并提 供具体业务服务。 AS 可以是独立的实体, 也可以存在于 S-CSCF 中。 S-CSCF根据用户的签约信息控制业务触发, 调用 AS上的业务, 实现业 务功能。 会话中的端到端设备称为 UE ( User Equipment , 用户设备) , 负责 与使用者的交互。 有的 UE具有多种接入移动网络的方式, 如通过 3GPP 移动网络的 PS ( Packet Switch, 包交换 )域接入移动网络, 通过非 3GPP 移动网络(如 CDMA (码分多址) IX或 Wimax (全球微波互联接入 ) 网络) 的 PS 域接入移动网络, 甚至可以通过移动网络的 CS ( Circuit Switch, 电路交换) 域接入移动网络。 移动网络包括基站子系统和核心 网, 核心网网元可以是 SGSN (服务 GPRS 支持节点) 、 GGSN (网关 GPRS支持节点) 、 MME (移动管理实体) 、 MSC、 PCF (分组控制功 能 ) 或 PDSN (分组数据服务节点) 等。 为了实现 UE在 CS域与 IMS 网络的交互, 在某些情况下需要 MSC能够获得 ICP信息, ICP可以是 P-CSCF、 I-CSCF、 IBCF、 ATCF或 AS等具有 IMS信令控制功能的实体, 甚至可以是具有 IMS信令功能的 MSC。
图 1是现有技术中 MSC获取 ICP信息的流程图, 获取流程包括: 步驟 101 : UE向移动网络发起附着请求, 比如向为自身服务的基站 子系统发送附着请求 (Attach Request ) 消息; 其中, 基站子系统可以是 基站系统( BSS, Base Station System )或无线网络控制器( RNC, Radio Network Controller ) 。
步驟 102: 基站子系统将附着请求消息发送给 MSC。
步驟 103: MSC收到附着请求消息后, 允许 UE附着并使用移动网 络, 于是向 UE发送允许附着消息, 比如附着接受 (Attach Accept ) 消 息, 该允许附着消息途经基站子系统。
步驟 104: 基站子系统将允许附着消息发送给 UE。
步驟 105: MSC允许 UE附着并使用移动网络后,向 UE的归属 IMS 网络发起注册请求, 比如向 UE的归属 IMS网络中的 S-CSCF发送注册 ( Register ) 消息, 该注册消息属于 IMS信令。 步驟 106: S-CSCF允许 UE接入 IMS网络, 于是向 MSC返回注册 响应, 比如发送 "200 OK" 消息, 该 "200 OK" 消息属于 IMS信令。
步驟 107: UE通过 PS域提供的接入服务和 P-CSCF向 UE的归属 IMS网络发起注册请求,比如向 P-CSCF发送 Register消息,以使用 IMS 网络提供的业务; 其中, Register消息属于 IMS信令。
以下步驟是 ICP不在 AS上的情况。
如果 ICP在 P-CSCF和 S-CSCF之间, 如在 IBCF上, 则包括: 步驟 108a: P-CSCF收到注册请求后, 选择服务该 UE的 ICP, 并将 该注册请求转发给该 ICP。
步驟 109a: ICP收到注册请求后, 向 S-CSCF发送另一注册请求, 该另一注册请求中携带有 ICP信息, 该 ICP信息可以是直接定位 ICP的 信息, 如 ICP的号码、 地址或标识, 也可以是间接定位 ICP的信息, 如 ICP的索引, 还可以是上述各种信息的任意组合。
步驟 110a: S-CSCF允许 UE接入 IMS网络并使用 IMS网络提供的 业务, 于是返回注册响应, 比如发送 "200 OK" 消息, 该 "200 OK" 消 息属于 IMS信令。
步驟 111a: 注册响应到达 ICP, ICP将该注册响应转发给 P-CSCF。 如果 ICP在 P-CSCF上, 则步驟 108a-l l la简化为:
P-CSCF收到注册请求后, 向 S-CSCF发送另一注册请求, 该另一注 册请求中携带有 ICP信息。
S-CSCF允许 UE接入 IMS网络并使用 IMS网络提供的业务, 于是 向 P-CSCF返回注册响应, 比如发送 "200 OK" 消息, 该 "200 OK" 消 息属于 IMS信令。
如果 ICP在 S-CSCF上, 则步驟 108a-l l la简化为:
P-CSCF收到注册请求后, 将该注册请求转发给 S-CSCF。 S-CSCF允许 UE接入 IMS网络并使用 IMS网络提供的业务, 于是 向 P-CSCF返回注册响应, 比如发送 "200 OK" 消息, 该 "200 OK" 消 息属于 IMS信令。
以下步驟是 ICP在 AS上的情况。
步驟 108b: P-CSCF收到注册请求后,将该注册请求转发给 S-CSCF。 步驟 109b: S-CSCF允许 UE接入 IMS网络并使用 IMS网络提供的 业务, 于是向 P-CSCF返回注册响应, 比如发送 "200 OK"消息,该 "200 OK" 消息属于 IMS信令。
步驟 110b: S-CSCF向 ICP转发注册请求。
步驟 111b: ICP收到注册请求后, 向 S-CSCF返回注册响应, 该注 册响应中携带有 ICP信息, 该 ICP信息可以是直接定位 ICP的信息, 如 ICP的号码、 地址或标识, 也可以是间接定位 ICP的信息, 如 ICP的索 引, 还可以是上述各种信息的任意组合。
以下步驟是上述两种情况后续的共同步驟。
步驟 112: P-CSCF收到步驟 111a或 109b的注册响应后, 向 UE转 发该注册响应。
步驟 113: S-CSCF获得 ICP信息后,将获得的 ICP信息通知给 MSC, 比如向 MSC发送 Notify (通知) 消息, 该 Notify消息中携带有获得的 ICP信息, 且该 Notify消息属于 IMS信令。
由以上流程可以看出, 现有技术中 MSC必须支持 IMS信令并完成 代替 UE的注册过程才能获得 ICP信息; 如果 MSC不支持 IMS信令, 则为了能够应用图 1 所示的流程, 需要增加新的接口与协议以使 MSC 能够与 S-CSCF进行消息交互, 因此上述流程的应用场景很有限。 发明内容
有鉴于此,本发明的主要目的在于提供一种 MSC获取 ICP信息的方法 及系统, 使 MSC无需增加新的接口及协议就能获得 ICP信息。 为达到上述目的, 本发明的技术方案是这样实现的:
一种移动交换中心获取 IMS控制点信息的方法, 所述方法包括: 应用服务器将 IMS控制点信息提供给服务 GPRS支持节点; 所述服务 GPRS支持节点在收到来自移动交换中心的询问后, 将所 述 IMS控制点信息发送给所述移动交换中心。
进一步地, 当 IMS控制点不在所述应用服务器上时, 在应用服务器 将 IMS控制点信息提供给服务 GPRS支持节点之前, 所述方法还包括: IMS控制点将所述 IMS控制点信息通过 IMS过程发送给所述应用服 务器。
进一步地, 所述应用服务器将 IMS控制点信息提供给服务 GPRS支 持节点为:
所述应用服务器将携带有所述 IMS控制点信息的通知消息发送给所 述服务 GPRS支持节点; 或
所述应用服务器将携带有所述 IMS控制点信息的更新消息发送给归 属用户服务器; 所述归属用户服务器将携带有所述 IMS控制点信息的通 知消息发送给所述服务 GPRS支持节点。
进一步地, 所述服务 GPRS支持节点收到来自移动交换中心的询问 前, 所述方法还包括: 所述移动交换中心收到呼叫请求或切换请求。
一种移动交换中心获取 IMS控制点信息的系统, 所述系统包括: 应 用服务器、 服务 GPRS支持节点和移动交换中心; 其中,
应用服务器, 用于将 IMS控制点信息提供给服务 GPRS支持节点; 移动交换中心, 用于向服务 GPRS支持节点询问 IMS控制点信息; 月良务 GPRS支持节点, 用于在收到来自移动交换中心的询问后, 将 IMS控制点信息发送给所述移动交换中心。 所述应用服务器进一步用于: 当 IMS控制点不在所述应用服务器上 时, 接收所述 IMS控制点通过 IMS过程发来的所述 IMS控制点信息。
进一步地, 所述系统还包括: 归属用户服务器, 用于接收所述应用 服务器发来的携带有所述 IMS控制点信息的更新消息, 并将携带有所述 IMS控制点信息的通知消息发送给所述服务 GPRS支持节点。
所述移动交换中心进一步用于: 在向所述服务 GPRS支持节点询问 IMS控制点信息前, 接收呼叫请求或切换请求。
由以上技术方案可以看出,本发明中, ICP信息是由 SGSN提供给 MSC 的, 因此 MSC可以不支持 IMS信令,并可以不增加新的接口及协议就能获 得 ICP信息, 所以本发明可以应用于更多的应用场景。 附图说明
图 1为现有技术中 MSC获取 ICP信息的流程图;
图 2为本发明实施例一的 MSC获取 ICP信息的流程图;
图 3为本发明实施例二的 MSC获取 ICP信息的流程图;
图 4为本发明实施例一种 MSC获取 ICP信息的系统的结构图。 具体实施方式
以下通过几个实施例对本发明作进一步详细说明。
实施例一
图 2是本发明实施例一的 MSC获取 ICP信息的流程图, 描述了 UE 在 CS域发起呼叫后, 由 MSC将 CS呼叫锚定在 IMS域的过程, 该过程 包括:
步驟 201 : UE通过 PS域向 IMS网络发起注册请求,比如发送 Register 消息。
步驟 202: 注册请求途经 P-CSCF, P-CSCF将注册请求转发给 ICP。 步驟 203: ICP向 S-CSCF转发另一注册请求, 该另一注册请求中携 带有 ICP信息,该 ICP信息可以是直接定位 ICP的信息,如 ICP的号码、 地址或标识, 也可以是间接定位 ICP的信息, 如 ICP的索引, 还可以是 上述各种信息的任意组合。
步驟 204: S-CSCF允许 UE接入 IMS网络, 于是返回注册响应, 比 如发送 "200 OK" 消息。
步驟 205: ICP收到注册响应后, 将注册响应转发给 P-CSCF。
步驟 206: P-CSCF收到注册响应后, 将注册响应转发给 UE。
步驟 202-206描述的是 ICP在 P-CSCF和 S-CSCF之间的情况, 如 ICP在 IBCF或 MSC上; 其中,此处的 MSC可以是 UE附着的 MSC (即 图 2所示的 MSC ) , 也可以是其他 MSC。 如果 ICP在 UE附着的 MSC 上, 由于 ICP是独立的功能实体, 因此步驟 202-206 以及后续的步驟 213-215没有变化。
如果 ICP在 P-CSCF上, 则步驟 202-206简化为:
P-CSCF收到注册请求后, 向 S-CSCF转发另一注册请求, 该另一注 册请求中携带有 ICP信息;
S-CSCF允许 UE接入 IMS网络,于是返回注册响应,比如发送" 200 OK" 消息;
P-CSCF收到注册响应后, 将注册响应转发给 UE。
如果 ICP在 S-CSCF上, 则步驟 202-206简化为:
注册请求途经 P-CSCF, P-CSCF将注册请求转发给 S-CSCF;
S-CSCF允许 UE接入 IMS网络, 于是返回注册响应;
P-CSCF收到注册响应后, 将注册响应转发给 UE。
上述这些步驟属于 IMS注册过程, UE和 IMS网络可能还存在其他 IMS消息交互过程,比如 UE发起 IMS呼叫过程, IMS呼叫请求的 Invite (邀请)消息经过 ICP时, ICP ( ICP不在 S-CSCF上)也可在向 S-CSCF 转发的 Invite消息中携带 ICP信息。
步驟 207: S-CSCF根据 UE的签约信息向 AS转发携带有 ICP信息 的注册请求。
在 IMS呼叫过程中, S-CSCF向 AS转发的是携带有 ICP信息的 Invite 消息。
步驟 208: AS向 S-CSCF返回注册响应, 比如发送 " 200 OK" 消息。 步驟 209: AS将携带有 ICP信息的通知消息发送给 SGSN, 比如发 送携带有 ICP信息的 Insert Subscriber Data (插入用户数据 ) 消息。
步驟 210: UE在 CS域向 MSC发送呼叫请求, 比如发送 Setup (建 立) 消息。
步驟 211 : 收到呼叫请求后, MSC向 SGSC询问 ICP信息, 比如发 送 Identity Request (标识请求 ) 消息。
步驟 212: SGSN返回携带有 ICP信息的响应, 比如发送携带有 ICP 信息的 Identity Response (标识响应 ) 消息。
至此, MSC获得了 ICP信息。
步驟 213: MSC根据 ICP信息向 ICP发送呼叫请求, 比如当 MSC 不支持 IMS信令时,发送 IAM( Initial Address Message,初始地址消息); 或当 MSC支持 IMS信令时, 发送 Invite消息。
步驟 214: ICP继续后续的 IMS呼叫过程。
步驟 215: ICP收到被叫的应答后, 向 MSC发送呼叫响应, 比如发 送 ANM ( Answer Message, 应答消息) 或 "200 OK" 消息。
步驟 216: MSC向 UE发送呼叫响应, 比如发送 Connect (连接 )消 如果 ICP在 AS上, 则步驟 209中 AS发送给 SGSN的 ICP信息是 由 AS生成的, 而不是由 S-CSCF转发来的, 且步驟 202-208变为: 注册请求途经 P-CSCF, P-CSCF将注册请求转发给 S-CSCF;
S-CSCF允许 UE接入 IMS网络,于是返回注册响应,比如发送" 200
OK" 消息;
P-CSCF收到注册响应后, 将注册响应转发给 UE;
S-CSCF根据 UE的签约信息向 AS转发注册请求;
AS向 S-CSCF返回注册响应, 比如发送 "200 OK" 消息。
由以上步驟 202-208的变形可知, 当 ICP在 AS上时, 转发的注册 请求或 Invite消息中没有 ICP信息。
实施例二
图 3是本发明实施例二的 MSC获取 ICP信息的流程图, 描述了 UE 在 CS域的会话被转移到 PS域,其间由 MSC通知 ICP开始转移的过程, 该过程包括:
步驟 301-308: 与图 2中步驟 201-208相同, 在此不再赘述。
步驟 309: AS 将携带有 ICP信息的更新消息发送给 HSS ( Home
Subscriber Server,归属用户服务器),比如发送携带有 ICP信息的 Sh-push ( Sh-推送) 消息。
如果 ICP在 AS上,则 ICP信息由 AS生成;否则, ICP信息由 S-CSCF 转发给 AS。
步驟 310: HSS向 SGSN发送携带有 ICP信息的通知消息, 比如发 送携带有 ICP信息的 Insert Subscriber Data消息。
步驟 309-310也可以由图 2中的步驟 209代替。
步驟 311 : UE在 CS域已有会话, 比如 UE在 CS域发起呼叫或在 CS 域接受呼叫而有会话, 会话进行过程中, 基站子系统决定将 UE 的 CS域会话切换到 PS域, 于是向 MSC发送切换请求, 触发 CS域到 PS 域的切换过程,比如发送 Handover Request(切换请求)消息或 Relocation Request (重定向请求) 消息。
步驟 312: 收到切换请求后, MSC向 SGSC询问 ICP信息, 比如发 送 Identity Request消息。
步驟 313: SGSN返回携带有 ICP信息的响应, 比如发送携带有 ICP 信息的 Identity Response消息。
至此, MSC获得了 ICP信息。
步驟 314: MSC根据 ICP信息向 ICP发送转移请求, 比如当 MSC 不支持 IMS信令时, 发送 IAM消息; 或当 MSC支持 IMS信令时, 发送 Invite消息。
步驟 315: ICP向 MSC返回转移响应, 比如发送 "200 OK" 消息。 步驟 316: MSC通知 UE切换到 PS域,比如发送 Handover Command (切换命令) 消息。
步驟 317: ICP发起重建 ICP控制的媒体网关与远端 UE的媒体连接 的过程,比如向远端 UE发送 relnvite(重邀请 )消息,或向 AS发送 Invite 消息并由 AS向远端 UE发送 relnvite消息。这里 ,对步驟 317和步驟 315 两者的时间顺序没有严格要求。
步驟 318: 步驟 316之后, UE调制到 PS域, 通过 PS域接入 IMS 网络。
步驟 319: UE在 PS域发起转移请求,比如发送 Invite消息或 relnvite 消息。
步驟 320: ICP收到转移请求后,向 UE返回转移响应,比如发送" 200 OK" 消息。
步驟 321 : ICP根据 UE发起的转移请求建立 ICP控制的媒体网关与 UE的媒体连接, 并通过 ICP的桥接作用使 UE在 PS域可以继续与远端 UE进行会话。
实施例二中步驟 313之后的过程还可以有其他实现方案, 实施例二 仅说明了其中一种情况的实现方案, 但步驟 313之后的过程并不影响步 驟 301-313之间的过程。
为实现上述方法, 本发明实施例还提供一种 MSC获取 ICP信息的 系统。 如图 4所示, 该系统包括: AS、 SGSN和 MSC; 其中,
AS , 用于将 ICP信息提供给 SGSN;
MSC, 用于向 SGSN询问 IMS控制点信息;
SGSN, 用于在收到来自 MSC的询问后, 将 ICP信息发送给 MSC。 所述 AS进一步用于: 当 ICP不在所述 AS上时, 接收所述 ICP通 过 IMS过程发来的所述 ICP信息。 ICP如何通过 IMS过程向 AS发送 ICP 信息可参见步驟 203-207, 在此不再赘述。
所述系统还包括: HSS , 用于接收所述 AS 发来的携带有所述 ICP 信息的更新消息, 并将携带有所述 ICP 信息的通知消息发送给所述
SGSN。
所述移动交换中心进一步用于: 在向所述 SGSN询问 ICP信息前, 接收呼叫请求或切换请求。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的 保护范围。

Claims

权利要求书
1、 一种移动交换中心获取 IMS控制点信息的方法, 其特征在于, 所述方法包括:
应用服务器将 IMS控制点信息提供给服务 GPRS支持节点; 所述服务 GPRS支持节点在收到来自移动交换中心的询问后, 将所 述 IMS控制点信息发送给所述移动交换中心。
2、 根据权利要求 1所述的移动交换中心获取 IMS控制点信息的方 法, 其特征在于, 当 IMS控制点不在所述应用服务器上时, 在应用服务 器将 IMS控制点信息提供给服务 GPRS支持节点之前,所述方法还包括:
IMS控制点将所述 IMS控制点信息通过 IMS过程发送给所述应用服 务器。
3、 根据权利要求 1所述的移动交换中心获取 IMS控制点信息的方 法, 其特征在于, 所述应用服务器将 IMS控制点信息提供给服务 GPRS 支持节点为:
所述应用服务器将携带有所述 IMS控制点信息的通知消息发送给所 述服务 GPRS支持节点; 或
所述应用服务器将携带有所述 IMS控制点信息的更新消息发送给归 属用户服务器; 所述归属用户服务器将携带有所述 IMS控制点信息的通 知消息发送给所述服务 GPRS支持节点。
4、 根据权利要求 1所述的移动交换中心获取 IMS控制点信息的方 法, 其特征在于, 所述服务 GPRS支持节点收到来自移动交换中心的询 问前, 所述方法还包括: 所述移动交换中心收到呼叫请求或切换请求。
5、 一种移动交换中心获取 IMS控制点信息的系统, 其特征在于, 所述系统包括: 应用服务器、 服务 GPRS支持节点和移动交换中心; 其 中, 应用服务器, 用于将 IMS控制点信息提供给服务 GPRS支持节点; 移动交换中心, 用于向服务 GPRS支持节点询问 IMS控制点信息; 月良务 GPRS支持节点, 用于在收到来自移动交换中心的询问后, 将 IMS控制点信息发送给所述移动交换中心。
6、 根据权利要求 5所述的移动交换中心获取 IMS控制点信息的系 统, 其特征在于, 所述应用服务器进一步用于: 当 IMS控制点不在所述 应用服务器上时, 接收所述 IMS控制点通过 IMS过程发来的所述 IMS 控制点信息。
7、 根据权利要求 5所述的移动交换中心获取 IMS控制点信息的系 统, 其特征在于, 所述系统还包括: 归属用户服务器, 用于接收所述应 用服务器发来的携带有所述 IMS控制点信息的更新消息 , 并将携带有所 述 IMS控制点信息的通知消息发送给所述服务 GPRS支持节点。
8、 根据权利要求 5所述的移动交换中心获取 IMS控制点信息的系 统, 其特征在于, 所述移动交换中心进一步用于: 在向所述服务 GPRS 支持节点询问 IMS控制点信息前, 接收呼叫请求或切换请求。
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