WO2011134334A1 - 反向单待业务连续性的实现方法及系统 - Google Patents

反向单待业务连续性的实现方法及系统 Download PDF

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Publication number
WO2011134334A1
WO2011134334A1 PCT/CN2011/072378 CN2011072378W WO2011134334A1 WO 2011134334 A1 WO2011134334 A1 WO 2011134334A1 CN 2011072378 W CN2011072378 W CN 2011072378W WO 2011134334 A1 WO2011134334 A1 WO 2011134334A1
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Prior art keywords
control entity
network
bearer
target network
msc
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PCT/CN2011/072378
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English (en)
French (fr)
Inventor
谢振华
陶全军
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中兴通讯股份有限公司
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Publication of WO2011134334A1 publication Critical patent/WO2011134334A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]

Definitions

  • the present invention relates to the field of communications, and in particular to a method and system for implementing reverse single-standby service continuity. Background technique
  • IP Multimedia Core Network Subsystem is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP). It is an open and flexible platform. The business environment, supporting multimedia applications, can provide users with rich multimedia services.
  • 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.
  • the service triggering and control functions in the control layer are performed by the Call Session Control Function (CSCF).
  • CSCF Call Session Control Function
  • the call session control functions are divided into: proxy call session control function (Proxy-CSCF, abbreviated as P-CSCF), query call session control function (Interrogating-CSCF, referred to as I-CSCF) and service call session control function (Serving-CSCF).
  • S-CSCF Service-CSCF
  • the service layer is composed of a series of application servers (Application Servers, AS for short), which can provide specific service services.
  • AS Application Servers
  • the AS can be an independent entity or exist in the S-CSCF.
  • the control layer 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 User Equipment (UE) and is responsible for interaction with the user.
  • UE User Equipment
  • Some UEs have multiple access networks, including packet switching through 3GPP (Packet Switch, referred to as For the PS) domain access network, access to the network through other non-3GPP PS domains, or even through the Circuit Switch (CS) domain access network.
  • the CS domain network is configured with an enhanced mobile switching center (eMSC)
  • the eMSC provides the Session Initial Protocol (SIP) interface to interact with the IMS network.
  • SIP Session Initial Protocol
  • the interaction can be achieved by eMSC.
  • For a UE with multiple access modes if the UE can only use one access mode at a certain time, when the call service is being executed in the 2/3G network access mode, the call service is on the 2/3G network. Only the CS domain can be provided.
  • the UE and the network can provide a way for the UE to perform the call service not being Interrupt, such a capability is called reverse single-standby terminal service continuity, referred to as reverse Single Radio Voice Call Continuity (rSRVCC for short), corresponding to if the UE is from the LTE network.
  • rSRVCC reverse Single Radio Voice Call Continuity
  • the PS domain of the HSPA network moves to the 2/3G network, which is the forward single-standby terminal service continuity, which is simply referred to as single-standby service continuity.
  • Step 101 UE-1 serves the same The original network sends a measurement report, and the cell signal strength measurement information is reported above.
  • Step 102 The base station system of the original network serving the UE-1 determines that the nearby PS target network is more suitable for the UE-1 according to the signal strength information of each cell in the measurement report. The service then decides to perform the handover operation.
  • the base station system of the original network sends a handover request to the MSC, for example, sends a Handover Required message.
  • the control entity may be an MME of a Long Term Evolution Network (LTE) or an SGSN of a High Speed Data Access Network (HSPA); Step 104, if UE-1 has According to the service, the base station system of the original network also sends a handover request to the original network data domain control entity (ie, the SGSN), for example, sending a Relocation Required message; after step 105, step 104, the original network data domain control entity The target network control entity sends a handover request, and sends a Forward Relocation Request message to the interface.
  • Step 106 The target network control entity sends a handover request to the target network base station system, for example, sends a Handover Request message.
  • Step 107 The target network base station system responds with a handover response message, for example, sends a Handover Request Acknowledge message.
  • Step 108 Target Network After receiving the handover response, the control entity sends a handover response message to the MSC, and sends a CS to PS Handover Response message to the MSC.
  • Step 110 If the UE-1 has a data service, the target network control entity sends a handover response to the original network data i or the control entity, and sends a Forward Relocation Response message to the interface.
  • the original network data domain controls the entity to the original network.
  • the base station system sends a handover command, and sends a Relocation Command message to the interface.
  • Step 112 The original network base station system sends a handover command to the UE-1, for example, sends a HO from UTRAN/GERAN message.
  • Step 113 UE-1 performs handover, and switches to the destination.
  • an attach request is sent to the control entity of the target network, for example, an Attach Request message is sent.
  • Step 114: The target network control entity sends an attach consent message to the UE-1, for example, sends an Attach Accept message.
  • Step 115 The UE-1 performs the standard.
  • the IMS session transfer process thereby updating the original media connection A to the media connection B;
  • Step 116 after the IMS session transfer process, the data network gateway initiates a standard dedicated bearer setup process, thereby establishing a connection between the UE-1 and the data network gateway.
  • the language bearer wherein the data network gateway includes a global GPRS support node (GGSN), a data network access gateway (PDN GW, abbreviated as PGW), and a serving gateway (Serving GW, SGW for short). Since then, the media connection between the UE-1 and the data network gateway has replaced the media connection between the original UE-1 and the MSC, and the media connection B has replaced the media connection A, completing the reverse single standby service continuity process.
  • GGSN global GPRS support node
  • PGW data network access gateway
  • SGW serving gateway
  • a primary object of the present invention is to provide a method and system for implementing reverse single-standby business continuity to solve at least one of the above problems.
  • a method for implementing reverse single-standby service continuity including: a source network control entity receives a handover request; a source network control entity requests a core network to create a bearer; and a source network control entity notifies the target network The control entity performs the handover process, and switches the created bearer to the target network. After the terminal switches to the target network, the media connection between the remote device and the remote device is established by switching to the bearer of the target network.
  • the source network control entity is an MSC; the core network creates a bearer including: the MSC sends a message for creating a bearer to the data network gateway of the core network, and carries the connection information of the media plane of the MSC; the data network gateway creates 7; the data network gateway to the MSC Returns a message that successfully created, and carries the connection information of the terminal.
  • the message returned by the data network gateway to the source network control entity further carries indication information indicating whether the terminal still has a data service when the handover occurs.
  • the source network control entity sends the indication information when notifying the target network control entity to perform the handover process. Control the entity to the target network. Wherein, the indication information indicates that there is still a data service; the target network control entity receives the
  • the source network control entity is a source network data domain control entity;
  • the core network creation bearer includes: the source network data domain control entity sends a message for creating a bearer to the data network gateway of the core network; the data network gateway creates a bearer, and the source network data domain The control entity sends a message that the bearer is successfully created, and carries the connection information of the terminal.
  • the method further includes: the MSC sending a handover request to the target network control entity, where the handover request carries the connection information of the MSC receiving media.
  • the method further includes: the target network control entity sending a handover request to the target network base station system; and the target network control entity receiving the handover response sent by the target network base station system to the data network
  • the gateway sends an update bearer message carrying the connection information of the media plane of the MSC.
  • the media connection between the terminal and the remote device is established by switching to the target network.
  • the MSC establishes a media connection between the MSC and the UE by using the bearer according to the connection information of the terminal.
  • the method further includes: the user equipment performing an IMS session transfer process, and updating the media connection between the remote device and the MSC to a media connection between the remote end and the terminal.
  • an implementation system for reverse single-standby service continuity including: a source network control entity, configured to request a core network to create a bearer when receiving a handover request, and receive a bearer After the successful message is created, the target network control entity is notified to execute the process; the core network is set to create a bearer for the user equipment; and the target network control entity is configured to perform the handover process after receiving the notification of the source network control entity, and the core network is The created bearer is switched to the target network, and after the terminal switches to the target network, the media connection between the terminal and the remote device is established through the bearer.
  • the source network control entity includes: a mobile switching center or a source network data domain control entity.
  • the source network control entity requests the core network to create a bearer when initiating a handover to the target network, and when the handover process is performed, the bearer is switched to the target network, and after the handover is completed, the UE and the remote device are established through the bearer.
  • the media connection between the two thereby solving the problem that the call can be resumed after the UE is switched to the target network and needs to undergo the IMS session transfer process and the dedicated bearer setup process, thereby causing a long time for the call interruption time, and improving the user body risk .
  • FIG. 1 is a flow chart of reverse single-standby business continuity according to the related art
  • 2 is a schematic structural diagram of an implementation system of reverse single-standby service continuity according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic structural diagram of an implementation system of reverse single-standby service continuity according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of a method for implementing reverse single-standby service continuity according to Embodiment 1 of the present invention
  • 4 is a schematic structural diagram of an implementation system for reverse single-standby service continuity according to Embodiment 2 of the present invention
  • FIG. 5 is a signaling flow of a method for implementing reverse single-standby service continuity according to Embodiment 2 of the present invention
  • FIG. 6 is a schematic structural diagram of an implementation system for reverse single-standby service continuity according to Embodiment 3 of the present invention
  • FIG. 7 is a letter of a method for implementing reverse single-standby service continuity according to Embodiment 3 of the present invention; Let the flow chart.
  • FIG. 2 is a schematic structural diagram of an implementation system for reverse single-standby service continuity according to Embodiment 1 of the present invention.
  • the system includes: a source network control entity 10, a core network 20, and a target network control entity 30.
  • the source network control entity 10 is configured to: when receiving the handover request, request the core network 20 to create a bearer, and after receiving the message that the bearer is successfully created, notify the target network control entity 30 to perform the handover process; the core network 20 is set to
  • the target network control entity 30 is configured to perform the handover process after receiving the notification from the source network control entity 10, and switch the bearer created by the core network 20 to the target network, and establish the switched terminal and the remote device by using the bearer.
  • the bearer may be created for the UE by the data network gateway (P-GW/S-GW) of the core network 20.
  • the source network control entity 10 may be an MSC or a source network data domain gateway.
  • the call between the UE and the remote device is resumed, thereby causing the call to be interrupted.
  • the bearer is first created for the UE in the core network, so that after the UE switches to the target network, the call can be resumed without creating a bearer, which can reduce the UE handover to
  • the waiting time after the target network shortens the time of interruption of the call and improves the user's physical insurance.
  • Step S302 the source network control entity 10 receives
  • the base station system of the source network that is the UE's monthly service receives the measurement information of the UE on the UE, and determines that the nearby PS domain target network is more suitable for the UE according to the signal strength information of each cell in the measurement report.
  • the service decides to perform the handover operation, and the base station system of the source network sends a handover request to the source network control entity.
  • Step S304 the source network control entity 10 requests the core network 20 to create a bearer; for example, the source network control entity 10 may send a message for creating a bearer to the core network 20 to create a bearer in the core network 20, and the bearer is used to transfer the CS media after the handover. Media data on the connection.
  • the source network control entity 10 notifies the target network control entity 30 to perform the handover procedure, and switches the created bearer to the target network.
  • the target network control entity 30 A standard PS domain handover procedure is performed, and the above-mentioned load created by the core network 20 is also switched to the target network.
  • Step S308 after the terminal switches to the target network, establish a media connection between the terminal and the remote device by switching to the bearer of the target network.
  • the bearer is created for the UE in the core network, which can reduce the waiting time after the UE switches to the target network, shorten the time of the call interruption, and improve the user experience.
  • FIG. 4 is a schematic structural diagram of a system for implementing a reverse single-standby service continuity according to Embodiment 2 of the present invention.
  • This embodiment is a preferred implementation manner of Embodiment 1.
  • source network control The entity 10 is a Mobile Switching Center (MSC).
  • MSC Mobile Switching Center
  • the reverse single-standby service continuity scheme in this embodiment is described by using the UE-1 to establish a call with the UE-2 through the CS i or the access, as the UE-1 implements the call through the CS domain of the 2/3G network. Therefore, the UE-1 connected to the UE-1 is a CS media connection.
  • Step 501 502 is a signaling flowchart of implementing reverse single-standby connectivity when the UE-1 is switched to the target network that is connected to the PS domain in the embodiment, and the method includes the following steps: Step 501 502, and the step of FIG. Step 4:
  • the MSC sends a request message for creating a bearer to the data network gateway (SGW or PGW) of the core network, for example, sending a Create Bearer Request message to create a bearer in the core network, and the bearer is used for switching.
  • the media data on the CS media connection is transmitted, and the request message carries the connection information of the media plane of the MSC.
  • the connection information of the media plane of the MSC includes: a receiving address and a port number of the media data.
  • Step 504 The data network gateway of the core network creates a bearer, and sends a response message to the MSC, for example, sending a Create Bearer Response message, where the response message carries the connection information of the UE-1;
  • the information includes the IP address and the port number of the UE-1, where the IP address may be allocated by the network when the PS domain initiates the attachment, and the port number may use the default configuration.
  • the response message may further include indication information indicating whether the UE further has a data service, that is, information indicating whether the UE has an active connection in the PS domain.
  • Step 505 After receiving the response message that the creation is successful, the MSC sends the response message to the target.
  • the network control entity sends a handover request, for example, sends a CS to PS Handover Request message; if the response message carries the indication information, the MSC carries the indication information in the handover request and sends the message to the target network control entity. .
  • Steps 506-507 which are the same as steps 104-105 of FIG. 1; Steps 509-510, the target network control entity performs a standard PS domain handover procedure, and the handover causes the bearer created in step 503 to also be switched to the target network, as shown in FIG.
  • Steps 106 to 107 are the same; if the response message in the above step 504 carries the indication information, and the indication information indicates that the UE-1 has a data service, the target network control entity sends a handover request to the target network base station system in step 509. Previously, it is necessary to confirm whether a handover request from the source network data domain control entity is received, and if so, the target network control entity sends a handover request to the target network base station system, otherwise, the target network control entity will wait for the source network data domain control entity Switch the request. Thereby, the synchronization of the voice service and the data service switching can be avoided. Step 511: After receiving the handover response, the target network control entity sends a handover response message to the MSC, for example, sending a CS to PS Handover Response message.
  • the MSC may establish a media connection between the MSC and the UE-1 according to the connection information of the UE-1, where the media connection includes: PS media between the UE-1 and the data network gateway (SGW/PGW) The connection and the media connection between the data network gateway (SGW or PGW) and the MSC (ie media connection B).
  • the MSC may use the obtained connection information of the UE-1 to transmit the media data originally sent to the UE-1 through the CS domain to the PS domain (ie, through the data).
  • the network gateway sends). Steps 512 to 515 are the same as steps 109 to 112 of FIG. 1.
  • Step 516 UE-1 performs an IMS session transfer process, thereby updating media connection A to media connection C, and media connection B can be released because it is no longer needed.
  • This step 4 is optional.
  • the MSC can send a request message for creating a bearer to the data network gateway of the core network, so as to create a bearer for the UE in the core network, thereby reducing the time for the call to be interrupted.
  • FIG. 6 is a schematic structural diagram of a system for implementing reverse single-standby service continuity according to Embodiment 3 of the present invention.
  • the source network domain control entity such as SGSN
  • the source network base station system sends a handover request to the source network data domain control entity whether the UE is a data service, and the source network data domain control entity requests the core network to create a bearer after receiving the handover request.
  • FIG. 7 is a signaling flowchart of a method for implementing reverse single-standby service continuity in the embodiment. In FIG.
  • Step 701 702 which is the same as step 4 of FIG.
  • Step 703 The MSC sends a handover request to the control entity of the target network, for example, sending CS To the PS Handover Request, the handover request carries the connection information of the media plane of the MSC, including the media data receiving address and the port, etc.;
  • Step 704 Regardless of whether the UE-1 has a data service, the source network base station system to the source network data domain
  • the control entity ie, the SGSN
  • Step 705 The source network data domain control entity sends a creation to the data network gateway using a standard second PDP (Packet Data Protocol) context activation procedure
  • the bearer request message for example, sends a Create PDP Context Request message, requesting to create a bearer for the UE;
  • Step 706 The data network gateway creates a bearer for the UE Sending a response message to the source network data domain control entity, for example, sending a Create PDP Context Response message,
  • the target network control entity After receiving the handover request, the target network control entity performs a standard PS domain handover procedure, and the handover causes the 7 packets created in step 705 to also switch to the target network.
  • the target network control entity sends an update bearer message to the data network gateway, for example, sends an Update Bearer Request message, where the message carries the connection information of the media plane of the MSC obtained in step 703; since then, the data network gateway obtains the media plane of the MSC.
  • the connection information, the PGW can forward the created data for transmitting the media data to the media side of the MSC.
  • Step 711 After receiving the handover response of the target network base station system, the target network control entity sends a handover response message to the MSC, for example, sending a CS to PS Handover Response message, carrying the connection information of UE-1 obtained in step 706;
  • the source network and the target network share a certain network element (for example, P-GW) in the data network gateway. Therefore, when the data network gateway acquires the connection information of UE-1, the target network control entity can also learn. Connection information to UE-1.
  • the MSC may establish a media connection with the UE-1 according to the acquired connection information of the UE-1, where the media connection passes through the data network gateway, that is, the media connection includes: a PS media connection between the UE-1 and the data network gateway.
  • the media connection between the data network gateway (SGW or PGW) and the MSC ie, the media connection in FIG. 7
  • the MSC can utilize the obtained UE-
  • the connection information of 1 transmits the media data originally sent to the UE-1 through the CS domain to the UE-1 through the PS domain (ie, the gateway through the data network).
  • Steps 712-715 are the same as steps 109-112 of FIG. 1.
  • Step 716 UE-1 performs an IMS session transfer process, thereby updating media connection A to media connection C, and media connection B can be released because it is no longer needed.
  • This step 4 is optional.
  • the source network data domain control entity may request the core network to create a bearer, thereby reducing the time of the call interruption and improving the user body risk.
  • the source network control entity when the source network control entity initiates the handover to the target network, the source network is first requested to create a bearer, and when the handover process is performed, the bearer is switched to the target network. After the handover is completed, the media connection between the UE and the remote device is established through the bearer, thereby solving the problem that the call can be resumed after the UE needs to undergo the IMS session transfer process and the dedicated load setup process after the UE switches to the target network, thereby causing the call interruption time. The longer time problem has improved the user experience.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be executed by a computing device
  • the program code is implemented so that they can be stored in the storage device by the computing device, and in some cases, the steps shown or described can be performed in a different order than here, or they can be separately produced.
  • the individual integrated circuit modules are implemented, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.

Abstract

本发明公开了一种反向单待业务连续性的实现方法及系统。其中,该方法包括:源网络控制实体接收到切换请求;源网络控制实体请求核心网创建承载;源网络控制实体通知目标网络控制实体执行切换流程,将创建的承载切换到目标网络;终端切换到目标网络后,通过切换到目标网络的承载建立与远端设备之间的媒体连接。通过本发明,可以减少反向单待业务连续性中通话中断的时间,提高用户体验。

Description

反向单待业务连续性的实现方法及系统 技术领域 本发明涉及通信领域, 具体而言, 涉及一种反向单待业务连续性的实现 方法及系统。 背景技术
IP多媒体子系统 ( IP Multimedia Core Network Subsystem, 简称为 IMS ) 是由第三代合作伙伴计划 ( 3rd Generation Partnership Project, 简称为 3GPP ) 提出的一种基于 IP的网络架构, 构建了一个开放而灵活的业务环境, 支持多 媒体应用, 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、 计费等功能。 控制层中业务触发和控制功能是由呼叫会话控制功能 ( Call Session Control Function, 简称为 CSCF ) 完成的。 呼叫会话控制功能分为: 代理呼 叫会话控制功能 (Proxy-CSCF, 简称为 P-CSCF )、 查询呼叫会话控制功能 ( Interrogating-CSCF , 简称为 I-CSCF ) 和服务呼叫会话控制功能 ( Serving-CSCF, 简称为 S-CSCF )三种类型, 其中负主要责任的是 S-CSCF, I-CSCF是可选的。 业务层是由一系列应用服务器( Application Server, 简称为 AS )组成的, 能提供具体业务服务, AS可以是独立的实体, 也可以存在于 S-CSCF中。 控制层( 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用户设备 ( User Equipment , 简称为 UE ) , 负 责与使用者的交互, 有的 UE具有多种接入网络的方式, 包括通过 3GPP的 分组交换( Packet Switch, 简称为 PS )域接入网络, 通过其他非 3GPP的 PS 域接入网络, 甚至可以通过电路交换( Circuit Switch , 简称为 CS )域接入网 络等。 如果 CS 域网络配置了增强移动交换中心 ( enhanced Mobile Switch Center, 简称为 eMSC ), 由 eMSC提供初始会话协议( Session Initial Protocol, 简称为 SIP )接口来与 IMS网络交互, 则 IMS网络与 CS域网络的交互可以 通过 eMSC来实现。 对于具有多种接入方式的 UE而言, 如果该 UE某时刻只能使用一种接 入方式,则其在 2/3G网络接入方式下正在执行通话业务时,通话业务在 2/3G 网络中只能由 CS域提供, 当 UE移动到其他地方而需要改变其使用的接入 方式为 LTE或 HSPA网络的 PS域时, UE和网络能提供某种方式使 UE正在 执行的通话业务不被中断, 这样的能力称之为反向单待终端业务连续性, 简 称反向单待业务连续性 (reverse Single Radio Voice Call Continuity, 简称为 rSRVCC ), 与之相对应的, 如果是 UE从 LTE网络或 HSPA网络的 PS域移 动到 2/3G网络则为正向单待终端业务连续性, 简称为单待业务连续性。 图 1是相关技术中反向单待业务连续性流程图, 描述了 UE-1通过 2/3G 网络的 CS域与 UE-2 间建立了通话, 通话媒体路径中连接 UE-1 的是一段 CS媒体连接, UE-1发生反向单待业务连续性后, 使用 PS域建立媒体连接 代替原 CS媒体连接, 并保持原会话连续的过程, 包括如下步骤: 步骤 101、 UE-1向为其服务的原网络发送测量报告, 以上报小区信号强 度测量信息; 步骤 102、为 UE-1服务的原网络的基站系统根据测量报告中各小区信号 强度信息判断附近的 PS 目标网络更适合为 UE- 1服务,于是决定执行切换操 作, 原网络的基站系统向 MSC发送切换请求, 比如发送 Handover required (切换请求) 消息; 步骤 103、MSC向目标网络的控制实体发送切换请求,比如发送 CS to PS Handover Request, 该控制实体可以是长期演进网络( LTE ) 的 MME或高速 数据访问网络 ( HSPA ) 的 SGSN; 步骤 104、如果 UE- 1还有数据业务, 则原网络的基站系统还会向原网络 数据域控制实体(也即 SGSN )发送切换请求, 比如发送 Relocation Required (切换请求) 消息; 步骤 105、 步骤 104之后, 原网络数据域控制实体向目标网络控制实体 发送切换请求, 比 口发送 Forward Relocation Request消息; 步骤 106、 目标网络控制实体向目标网络基站系统发送切换请求, 比如 发送 Handover Request (切换请求 ) 消息; 步骤 107、 目标网络基站系统回应切换响应消息, 比如发送 Handover Request Acknowledge消息; 步骤 108、 目标网络控制实体收到切换响应后, 向 MSC发送切换响应消 息, 比 口发送 CS to PS Handover Response消息; 步骤 109、 MSC 向原网络基站系统发送切换命令, 比如发送 Handover Command (切换命令) 消息; 步骤 110、 如果 UE-1还有数据业务, 则目标网络控制实体还会向原网络 数据 i或控制实体发送切换响应, 比 口发送 Forward Relocation Response消息; 步骤 111、 步骤 110之后, 原网络数据域控制实体向原网络基站系统发 送切换命令, 比^口发送 Relocation Command消息; 步骤 112、 原网络基站系统向 UE-1发送切换命令, 比如发送 HO from UTRAN/GERAN消息; 步骤 113、 UE-1执行切换, 切换到目标网络中, 然后向目标网络的控制 实体发送附着请求, 比如发送 Attach Request消息; 步骤 114、目标网络控制实体向 UE-1发送附着同意消息,比如发送 Attach Accept消息; 步骤 115、 UE-1执行标准的 IMS会话转移过程, 从而将原媒体连接 A 更新为媒体连接 B; 步骤 116、 数据网络网关在 IMS会话转移过程后, 发起标准的专用承载 建立过程, 从而建立 UE- 1 和数据网络网关间的语言承载, 其中数据网络网 关包括全局 GPRS 支持节点 (GGSN )、 数据网接入网关 (PDN GW, 简称 PGW ) 和服务网关 ( Serving GW, 简称 SGW )。 自此, UE-1和数据网络网关间的媒体连接取代了原 UE-1与 MSC间的 媒体连接,媒体连接 B取代了媒体连接 A,完成了反向单待业务连续性过程。 发明人发现, 在上述相关技术的单待业务连续性实现方法中, 在切换命 令到达 UE-1 JL UE-1切换到目标网络 (即上述步骤 113 ) 后, UE-1与 UE-2 之间通话已中断,在 IMS会话转移过程和专用 载建立过程完成后通话才能 恢复, 这导致通话中断时间的时间较长, 降低了用户体验。 发明内容 本发明的主要目的在于提供一种反向单待业务连续性的实现方法及系 统, 以至少解决上述问题之一。 根据本发明的一个方面, 提供了一种反向单待业务连续性的实现方法, 包括: 源网络控制实体接收到切换请求; 源网络控制实体请求核心网创建承 载; 源网络控制实体通知目标网络控制实体执行切换流程, 将创建的承载切 换到目标网络; 终端切换到目标网络后, 通过切换到目标网络的承载建立与 远端设备之间的媒体连接。 其中, 源网络控制实体为 MSC; 核心网创建承载包括: MSC向核心网 的数据网络网关发送创建承载的消息, 携带 MSC 的媒体面的连接信息; 数 据网络网关创建 7 载; 数据网络网关向 MSC返回 载创建成功的消息, 携 带终端的连接信息。 其中, 数据网络网关向源网络控制实体返回的消息中还携带有指示终端 在切换时是否还存在数据业务的指示信息; 源网络控制实体在通知目标网络 控制实体执行切换流程时, 将指示信息发送给目标网络控制实体。 其中, 指示信息指示还存在数据业务; 目标网络控制实体在接收到来自
MSC的切换请求以及来自源网络数据域控制实体的切换请求后,向目标网络 基站系统发送切换请求。 其中, 源网络控制实体为源网络数据域控制实体; 核心网创建承载包括: 源网络数据域控制实体向核心网的数据网络网关发送创建承载的消息; 数据 网络网关创建承载, 向源网络数据域控制实体发送承载创建成功的消息, 携 带终端的连接信息。 其中, 在源网络数据域控制实体向数据网络网关发送创建承载的请求消 息之前, 还包括: MSC向目标网络控制实体发送切换请求, 切换请求中携带 有 MSC接收媒体的连接信息。 其中, 在源网络控制实体通知目标网络控制实体执行切换流程之后, 还 包括: 目标网络控制实体向目标网络基站系统发送切换请求; 目标网络控制 实体接收目标网络基站系统发送的切换响应, 向数据网络网关发送更新承载 的消息, 携带 MSC的媒体面的连接信息。 其中, 通过切换到目标网络的 7 载建立终端与远端设备之间的媒体连接 包括: MSC根据终端的连接信息, 通过承载建立 MSC与 UE之间的媒体连 接。 其中, 在用户设备切换到目标网络之后, 还包括: 用户设备执行 IMS会 话转移过程, 将远端设备与 MSC之间的媒体连接更新为远端与终端之间的 媒体连接。 根据本发明的另一方面, 提供了一种反向单待业务连续性的实现系统, 包括: 源网络控制实体, 设置为在接收到切换请求时, 请求核心网创建承载, 并在接收到承载创建成功的消息后, 通知目标网络控制实体执行流程; 核心 网, 设置为为用户设备创建承载; 目标网络控制实体, 设置为在接收到源网 络控制实体的通知后,执行切换流程,将核心网创建的承载切换到目标网络, 在终端切换到目标网络后, 通过承载建立终端与远端设备之间的媒体连接。 其中, 源网络控制实体包括: 移动交换中心或源网络数据域控制实体。 通过本发明, 源网络控制实体在向目标网络发起切换时, 先请求核心网 创建承载, 在执行切换流程时, 将承载切换到目标网络, 在切换完成后, 通 过该承载建立 UE与远端设备之间的媒体连接, 从而解决了在 UE切换到目 标网络之后需要经历 IMS 会话转移过程和专用承载建立过程后才能恢复通 话, 而导致通话中断时间的时间较长的问题, 提高了用户体 -险。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中: 图 1是根据相关技术的反向单待业务连续性的流程图; 图 2是才艮据本发明实施例一的反向单待业务连续性的实现系统的结构示 意图; 图 3 是根据本发明实施例一的反向单待业务连续性的实现方法的流程 图; 图 4是才艮据本发明实施例二的反向单待业务连续性的实现系统的结构示 意图; 图 5是根据本发明实施例二的反向单待业务连续性的实现方法的信令流 程图; 图 6是才艮据本发明实施例三的反向单待业务连续性的实现系统的结构示 意图; 图 7是根据本发明实施例三的反向单待业务连续性的实现方法的信令流 程图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 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组合。 实施例一 图 2是才艮据本发明实施例一的反向单待业务连续性的实现系统的结构示 意图, 该系统包括: 源网络控制实体 10、 核心网 20和目标网络控制实体 30。 其中, 源网络控制实体 10, 设置为在接收切换请求时, 请求核心网 20创建 承载, 并在接收到承载创建成功的消息后, 通知目标网络控制实体 30 执行 切换流程; 核心网 20, 设置为创建承载; 目标网络控制实体 30, 设置为在 接收到源网络控制实体 10的通知后, 执行切换流程, 将核心网 20创建的承 载切换到目标网络,通过该承载建立切换后终端与远端设备之间的媒体连接。 其中, 可以由核心网 20的数据网络网关 ( P-GW/S-GW ) 为 UE创建承 载。 源网络控制实体 10可以为 MSC, 也可以为源网络数据域网关。 相关技术中, 在 UE切换到目标网络后, 在执行 IMS会话转移过程和专 用 载建立过程后, 再恢复 UE与远端设备的通话, 从而导致通话中断的时 间较长, 而在上述系统中, 在 UE切换到目标网络之前, 先在核心网为 UE 创建承载, 从而当 UE切换到目标网络之后, 无需创建承载就可以恢复通话, 这可以减少 UE切换到目标网络后等待的时间, 缩短通话中断的时间, 提高 了用户体险。 图 3 为才艮据本发明实施例一的反向单待业务连续性的实现方法的流程 图, 该方法主要包括以下步骤 (步骤 S302 -步骤 S308 ): 步骤 S302 , 源网络控制实体 10接收到切换请求; 例如, 为 UE月艮务的源网络的基站系统在接收到 UE上 4艮的测量 4艮告时, 根据测量报告中各小区信号强度信息判断附近的 PS域目标网络更适合为 UE 服务, 决定执行切换操作, 源网络的基站系统向源网络控制实体发送切换请 求。 步骤 S304 , 源网络控制实体 10请求核心网 20创建承载; 例如, 源网络控制实体 10可以向核心网 20发送创建承载的消息, 以在 核心网 20创建承载, 该承载用于切换后传递 CS媒体连接上的媒体数据。 步骤 S306,源网络控制实体 10通知目标网络控制实体 30执行切换流程, 将创建的上述承载切换到目标网络; 在实际应用中, 目标网络控制实体 30在接收到源网络控制实体 10的通 知后, 执行标准的 PS域切换流程, 通过该切换流程, 将核心网 20创建的上 述^载也切换到目标网络中。 步骤 S308 , 终端切换到目标网络后, 通过切换到目标网络的上述承载建 立终端与远端设备之间的媒体连接。 相关技术中, 在 UE切换到目标网络后, 在执行 IMS会话转移过程和专 用 载建立过程后, 再恢复 UE与远端设备的通话, 从而导致通话中断的时 间较长, 而在上述方法中, 在 UE切换到目标网络之前, 先在核心网为 UE 创建承载, 从而可以减少 UE切换到目标网络后等待的时间, 缩短通话中断 的时间, 提高了用户体验。 实施例二 图 4为根据本发明实施例二的反向单待业务连续性的实现系统的结构示 意图, 本实施例为实施例一的一种优选实施方式, 在本实施例中, 源网络控 制实体 10为移动交换中心 (MSC )。 以 UE-1通过 CS i或接入建立与 UE-2的通话为例对本实施例中的反向单 待业务连续性方案进行说明, 由于 UE-1通过 2/3G网络的 CS域实现通话, 因此通话媒体路径中连接 UE-1 的是一段 CS媒体连接。 图 5为本实施例中 UE-1发生到 PS域接入的目标网络的切换时, 实现反向单待连接性的信令流 程图, 主要包括以下步骤: 步骤 501 502、 与图 1的步 4聚 101 102相同; 步骤 503、 MSC向核心网的数据网络网关 ( SGW或 PGW )发送创建承 载的请求消息, 例如, 发送 Create Bearer Request消息, 以在核心网创建 载, 该承载用于在切换后传递 CS媒体连接上的媒体数据, 该请求消息中携 带有 MSC的媒体面的连接信息; 其中, MSC的媒体面的连接信息包括:媒体数据的接收地址及端口号等。 步骤 504、核心网的数据网络网关创建承载, 并向 MSC发送创建成功的 响应消息, 例如, 发送 Create Bearer Response 消息, 该响应消息中携带有 UE-1的连接信息; 其中, UE-1的连接信息包括 UE-1的 IP地址和端口号, 其中, IP地址 可以是 UE- 1在 PS域发起附着时网络为之分配的, 而端口号可以釆用缺省配 置。 并且, 该响应消息还可以携带用于指示 UE是否还具有数据业务的指示 信息, 即指示 UE是否在 PS域有活动的连接的信息; 步骤 505、 MSC 接收到创建成功的响应消息后, 向目标网络控制实体 ( MME或 SGSN )发送切换请求, 例如, 发送 CS to PS Handover Request 消息; 如果上述响应消息中携带有上述指示信息, 则 MSC将该指示信息携带 在切换请求中发送给目标网络控制实体。 步骤 506〜507、 与图 1的步骤 104〜105相同; 步骤 509〜510、 目标网络控制实体执行标准的 PS域切换流程, 切换使得 步骤 503创建的承载也切换到目标网络中, 与图 1的步骤 106〜107相同; 如果上述步骤 504中的响应消息中携带有上述指示信息, 且该指示信息 指示 UE-1存在数据业务, 则步骤 509中目标网络控制实体在向目标网络基 站系统发送切换请求之前, 需要确认是否接收到了来自源网络数据域控制实 体的切换请求, 如果是, 则目标网络控制实体向目标网络基站系统发送切换 请求, 否则, 目标网络控制实体将等待源网络数据域控制实体的切换请求。 从而可以避免语音业务和数据业务切换的不同步。 步骤 511、 目标网络控制实体接收到切换响应后, 向 MSC发送切换响应 消息, 例如 , 发送 CS to PS Handover Response消息;
MSC在接收到切换响应后,可以根据 UE- 1的连接信息建立 MSC与 UE- 1 之间的媒体连接, 该媒体连接包括: UE-1与数据网络网关 (SGW/PGW )之 间的 PS媒体连接以及数据网络网关( SGW或 PGW )与 MSC之间的媒体连 接 (即媒体连接 B )。 当 MSC接收到通知表明 UE-1切换到了目标网络后, MSC可以利用获得的 UE-1的连接信息,将原本通过 CS域发给 UE-1的媒体 数据转而通过 PS域发送(即通过数据网络网关发送)。 步骤 512〜515、 与图 1的步骤 109〜112相同; 至此 UE-1切换到目标网络, MSC将原本通过 CS域发给 UE-1的媒体数 据转而通过 PS域发送, 将收到的通过 PS域发送来的 UE-1的媒体数据发送 给远端 (即 UE-2 )。 步骤 516、 UE-1执行 IMS会话转移过程, 从而将媒体连接 A更新为媒 体连接 C, 媒体连接 B因不再需要而可以被释放。 该步 4聚为可选。 通过本实施例, 可以由 MSC 向核心网的数据网络网关发送创建承载的 请求消息, 以在核心网为 UE创建 载, 从而减少通话中断的时间。 实施例三 图 6为根据本发明实施例三的反向单待业务连续性的实现系统的结构示 意图,该实施例与实施例二的区别在于,由源网络数据域控制实体(如 SGSN ) 请求核心网创建承载。 在本实施例中, 无论 UE是否为数据业务, 源网络基 站系统都会向源网络数据域控制实体发送切换请求, 源网络数据域控制实体 在接收到该切换请求后, 请求核心网创建承载。 图 7为本实施例中反向单待业务连续性的实现方法的信令流程图, 在图 7中, UE-1通过 2/3G网络的 CS域建立与 UE-2的通话, 在本实施例中反向 单待业务连续性的实现方法主要包括以下步骤: 步骤 701 702、 与图 1的步 4聚 101 102相同; 步骤 703、 MSC向目标网络的控制实体发送切换请求, 例如,发送 CS to PS Handover Request, 该切换请求中携带有 MSC的媒体面的连接信息, 包括 媒体数据接收地址与端口等; 步骤 704、 无论 UE- 1是否有数据业务, 源原网络基站系统向源网络数据 域控制实体(即 SGSN )发送切换请求, 例如发送 Relocation Required (切换 请求) 消息; 步骤 705、 源网络数据域控制实体釆用标准的第二 PDP (分组数据协议 ) 上下文激活过程向数据网络网关发送创建承载的请求消息,例如,发送 Create PDP Context Request消息, 要求为 UE创建 载; 步骤 706、 数据网络网关为 UE创建承载, 向源网络数据域控制实体发 送 ? 载创建成功的响应消息, 例如发送 Create PDP Context Response消息, 该响应消息中携带 UE-1 的连接信息, 包括 UE的连接地址以及媒体面数据 的接) 端口; 步骤 707〜709、 与图 1的步骤 105〜107相同, 目标网络控制实体接收到 切换请求后, 执行标准的 PS域切换流程, 切换使得步骤 705创建的 7 载也 切换到目标网络中; 步骤 710、 目标网络控制实体向数据网络网关发送更新承载消息, 例如 发送 Update Bearer Request消息,该消息携带有步骤 703中获得 MSC的媒体 面的连接信息; 自此, 数据网络网关获取到 MSC的媒体面的连接信息, PGW可以将创 建的用于传送媒体数据的 载中的数据转发给 MSC的媒体面。 步骤 711、 目标网络控制实体接收到目标网络基站系统的切换响应后, 向 MSC发送切换响应消息, 例如, 发送 CS to PS Handover Response消息, 携带步骤 706中获得的 UE-1的连接信息; 在实际应用中,源网络和目标网络会共用数据网络网关中的某个网元(例 如, P-GW ), 因此, 在数据网络网关获取到 UE- 1 的连接信息时, 目标网络 控制实体也可以获知到 UE-1的连接信息。
MSC可以根据获取到的 UE-1的连接信息建立与 UE-1之间的媒体连接, 该媒体连接通过数据网络网关, 即该媒体连接包括: UE-1与数据网络网关之 间的 PS媒体连接以及数据网络网关( SGW或 PGW )与 MSC之间的媒体连 接 (即图 7中的媒体连接 Β ), 当 MSC在接收到通知表明 UE-1切换到了目 标网络后, MSC可以利用获得的 UE-1的连接信息, 将原本通过 CS域发给 UE-1的媒体数据转而通过 PS域(即通过数据网络的网关) 发给 UE-1。 步骤 712〜715、 与图 1的步骤 109〜112相同; 至此 UE-1切换到目标网络, MSC将原本通过 CS域发给 UE-1的媒体数 据转而通过 PS域发送, 将收到的通过 PS域发送来的 UE-1的媒体数据发送 给远端。 步骤 716、 UE-1执行 IMS会话转移过程, 从而将媒体连接 A更新为媒 体连接 C, 媒体连接 B因不再需要而可以被释放。 该步 4聚为可选。 通过本实施例, 可以由源网络数据域控制实体请求核心网创建承载, 从 而减少通话中断的时间, 提高用户体 -险。 从以上的描述中, 可以看出, 在本发明实施例中, 源网络控制实体在向 目标网络发起切换时, 先请求核心网创建承载, 在执行切换流程时, 将承载 切换到目标网络, 在切换完成后, 通过该承载建立 UE与远端设备之间的媒 体连接, 从而解决了在 UE切换到目标网络之后需要经历 IMS会话转移过程 和专用 载建立过程后才能恢复通话, 而导致通话中断时间的时间较长的问 题, 提高了用户体验。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 并 且在某些情况下, 可以以不同于此处的顺序执行所示出或描述的步骤, 或者 将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种反向单待业务连续性的实现方法, 包括:
源网络控制实体接收到切换请求;
所述源网络控制实体请求核心网创建承载;
所述源网络控制实体通知目标网络控制实体执行切换流程, 将创 建的所述 7 载切换到目标网络; 终端切换到目标网络后, 通过切换到所述目标网络的所述承载建 立与远端设备之间的媒体连接。
2. 根据权利要求 1所述的方法, 其中, 所述源网络控制实体为移动交换 中心 MSC; 所述核心网创建 载包括:
所述 MSC向所述核心网的数据网络网关发送创建承载的消息,携 带所述 MSC的媒体面的连接信息;
所述数据网络网关创建所述承载;
所述数据网络网关向所述 MSC返回 7 载创建成功的消息,携带所 述终端的连接信息。
3. 根据权利要求 2所述的方法, 其中, 所述数据网络网关向所述源网络 控制实体返回的所述消息中还携带有指示所述终端在切换时是否还存 在数据业务的指示信息; 所述源网络控制实体在通知所述目标网络控 制实体执行切换流程时, 将所述指示信息发送给所述目标网络控制实 体。
4. 根据权利要求 3所述的方法, 其中, 所述指示信息指示还存在数据业 务;所述目标网络控制实体在接收到来自 MSC的切换请求以及来自源 网络数据域控制实体的切换请求后, 向目标网络基站系统发送切换请 求。
5. 根据权利要求 1所述的方法, 其中, 所述源网络控制实体为源网络数 据域控制实体; 所述核心网创建承载包括: 所述源网络数据域控制实体向所述核心网的数据网络网关发送创 建承载的消息;
所述数据网络网关创建所述承载, 向所述源网络数据域控制实体 发送承载创建成功的消息, 携带所述终端的连接信息。
6. 根据权利要求 5所述的方法, 其中, 在所述源网络数据域控制实体向 所述数据网络网关发送创建承载的请求消息之前, 还包括: MSC向所 述目标网络控制实体发送切换请求, 所述切换请求中携带有所述 MSC 接收媒体的连接信息。
7. 根据权利要求 5所述的方法, 其中, 在所述源网络控制实体通知目标 网络控制实体执行切换流程之后, 还包括:
所述目标网络控制实体向目标网络基站系统发送切换请求; 所述目标网络控制实体接收所述目标网络基站系统发送的切换响 应, 向所述数据网络网关发送更新所述承载的消息,携带所述 MSC的 媒体面的连接信息。
8. 根据权利要求 2或 7所述的方法, 其中, 通过切换到所述目标网络的 所述^载建立所述终端与所述远端设备之间的媒体连接包括: 所述 MSC 居所述终端的连接信息, 通过所述^载建立所述 MSC与所述 UE之间的媒体连接。
9. 根据权利要求 8所述的方法, 其中, 在所述用户设备切换到所述目标 网络之后, 还包括: 所述用户设备执行 IMS会话转移过程, 将所述远 端设备与 MSC 之间的媒体连接更新为所述远端与所述终端之间的媒 体连接。
10. —种反向单待业务连续性的实现系统, 包括:
源网络控制实体, 设置为在接收到切换请求时, 请求核心网创建 承载, 并在接收到所述承载创建成功的消息后, 通知目标网络控制实 体执行流程;
所述核心网, 设置为为所述用户设备创建所述承载; 所述目标网络控制实体, 设置为在接收到所述源网络控制实体的 通知后, 执行切换流程, 将所述核心网创建的所述 7 载切换到所述目 标网络, 在终端切换到目标网络后, 通过所述承载建立所述终端与远 端设备之间的媒体连接。
11. 根据权利要求 10所述的系统, 其中, 所述源网络控制实体包括: 移动 交换中心或源网络数据域控制实体。
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