WO2014023139A1 - 一种srvcc支持同号的系统及方法 - Google Patents

一种srvcc支持同号的系统及方法 Download PDF

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Publication number
WO2014023139A1
WO2014023139A1 PCT/CN2013/077940 CN2013077940W WO2014023139A1 WO 2014023139 A1 WO2014023139 A1 WO 2014023139A1 CN 2013077940 W CN2013077940 W CN 2013077940W WO 2014023139 A1 WO2014023139 A1 WO 2014023139A1
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WIPO (PCT)
Prior art keywords
network
terminal device
call
ims
ims network
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PCT/CN2013/077940
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English (en)
French (fr)
Inventor
高扬
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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 US14/399,388 priority Critical patent/US20150131614A1/en
Priority to EP13828408.8A priority patent/EP2843995A4/en
Priority to JP2015516436A priority patent/JP2015523796A/ja
Priority to KR1020157004995A priority patent/KR20150038388A/ko
Publication of WO2014023139A1 publication Critical patent/WO2014023139A1/zh
Priority to IN9570DEN2014 priority patent/IN2014DN09570A/en
Priority to HK15103383.2A priority patent/HK1203019A1/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
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control 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]
    • H04W36/00226—Control 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/04—Registration at HLR or HSS [Home Subscriber Server]

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a system and method for SRVCC supporting the same number. Background technique
  • the Internet Protocol Multimedia Subsystem is the future of multi-media communication and the most important component of next-generation networks. It is a subsystem supporting IP multimedia services proposed by the 3GPP (3GPP, Third Generation Partnership Project). Its distinctive feature is the use of the Session Initial Protocol (SIP) system. Communication is independent of access mode. It can have multiple multimedia service control functions and bearer separation, call and session separation, application and service separation, service and network separation, and mobile network and Internet service integration.
  • IP Session Initial Protocol
  • SRVCC Single Radio Voice Call Continuity
  • 3GPP 3rd Generation Partnership Project
  • the problem of call continuity is to ensure smooth switching between IMS-controlled VoIP voice and CS domain voice by a single radio UE.
  • the SRVCC corresponds to the UE of the Single Radio, that is, the UE can only use one of the 2G/3G Radio and the LTE Radio at the same time.
  • the SR requirement is proposed by the terminal manufacturer, and the purpose is to reuse the 2G/3G and LTE networks. RF and related circuits.
  • the unique nature of SRVCC due to Single Radio The switching between Radio is very fast, but before the handover, the CS-related network side channel needs to be established, and the remote end is updated.
  • SRVCC switching in the process design, first CS channel creation and Remote Update, then PS to CS Handover; Roaming, Remote Update time is Second level.
  • the SRVCC system defined by 3GPP involves users having to use two different subscriber numbers in the IMS and CS networks during handover, which makes the SRVCC system inefficient, and on the other hand, inconvenience to the user in actual operation. Summary of the invention
  • the main technical problem to be solved by the present invention is to provide a system and method for SRVCC supporting the same number, which can improve the working efficiency of the SRVCC system and is convenient for users to use.
  • the present invention provides a method for SRVCC to support the same number.
  • the specific technical solutions are as follows:
  • a method in which SRVCC supports the same number including:
  • the first terminal device establishes a call with the second terminal device in the IMS network by using the user number; when the first terminal device acts as the calling party, and the first terminal device switches from the IMS network to the CS network, the first terminal device uses the user number Establishing a call with the second terminal device on the CS network.
  • the method for supporting the same number by the SRVCC further includes: when the first terminal device is initially registered in the IMS network, the IMS network updates user location information of the CS network.
  • the method for supporting the same number by the SRVCC further includes: when the second terminal device acts as the calling party to call the first terminal in the IMS network or the CS network, the IMS network or the CS network queries the user location information, and determines the first terminal device. At the network, and establish a call with the first terminal device in the network.
  • the specific process of the first terminal device establishing a call with the second terminal device by using the user number in the CS network includes:
  • the first terminal device establishes a call with the SCC AS in the CS network by using the user number; the CSCF triggers the SCC AS; The SCC AS queries the original IMS network call, connects the current call to the original IMS network call, and establishes a call with the second terminal device to release the original IMS domain call.
  • the process for the IMS network to update user location information of the CS network includes: the IMS network storing user location information of the first terminal;
  • the IMS network sends a request message to the HLR located in the CS network, and notifies the HLR to update the user location information of the first terminal;
  • the HLR stores user location information of the first terminal obtained from the IMS network.
  • the present invention also proposes a system in which the SRVCC supports the same number, and the specific technical solutions are as follows:
  • a system in which the SRVCC supports the same number includes: an IMS network, a CS network, a first terminal device, and a second terminal device;
  • the first terminal device is configured to establish a call with the second terminal device on the IMS network by using the user number
  • the IMS network is configured to update user location information of the CS network when the first terminal device is initially registered in the IMS network.
  • the second terminal device is configured to call the first terminal device in the IMS network or the CS; the IMS network or the CS network is configured to query when receiving the second terminal device as the calling call of the first terminal device by the calling terminal.
  • the user location information determines the network where the first terminal device is located, and establishes a call with the first terminal device in the network where the first terminal device is located.
  • the IMS network includes an SCC AS and a CSCF; the first terminal device is configured to establish a call with the SCC AS in the CS network by using the user number, and the CSCF is configured to trigger the SCC AS, the SCC
  • the AS is configured to query the original IMS domain call, connect the current call to the original IMS network call, establish a call with the second terminal device, and release the original IMS network call.
  • the CS network includes an HLR; the IMS network is configured to store user location information of the first terminal, send a request message to the HLR located in the CS network, and notify the HLR to update the user location information of the first terminal; User location information of the first terminal acquired from the IMS network, and storing user location information of the first terminal.
  • the SRVCC of the present invention supports the same number of systems and methods, so that the terminal uses the same user number when the network is switched, which is convenient for the user to use; when the first terminal device in the system acts as the calling party to switch the network, the same user number is used.
  • the device can establish a call with the first terminal on the initial network where the first terminal device is located, and solve the problem that the network that the first terminal uses the same user number cannot identify.
  • FIG. 1 is a schematic structural diagram of a system in which SRVCC supports the same number according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a system IMS network that supports the same number of system IMS network update CS network users according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of another structure of a system in which SRVCC supports the same number according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a domain handover of a normal call of a first terminal device of a system supporting SRVCC according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of signaling interaction of a handover of a normal call of a first terminal device of a system in which the SRVCC supports the same number in the embodiment of the present invention
  • FIG. 6 is a flowchart of a domain handover when the first terminal device of the system supporting the same number is called when the SRVCC supports the same embodiment
  • FIG. 7 is a schematic diagram of a system in which the SRVCC supports the same number in the first terminal device of the embodiment of the present invention when it is called Schematic diagram of signaling interaction;
  • FIG. 9 is a schematic diagram of signaling interaction in which the first terminal device of the system supporting the same number is switched by the master when the SRVCC supports the embodiment of the present invention. detailed description
  • the system supporting the same number by the SRVCC in this embodiment includes: an IMS network, a CS network, a first terminal device, and a second terminal device;
  • the first terminal device is configured to establish a call with the second terminal device in the IMS network by using the user number, and is further configured to use the user number in the CS network when the MME network is switched to the CS network.
  • the second terminal device establishes a call.
  • the first terminal device in the embodiment uses the user number as the calling party to call the second terminal device in the IMS network. If the first terminal device needs to switch the network, that is, when switching from the IMS network to the CS network, due to the IMS network, The first terminal initiates a call in the CS network by using the previous user number, and establishes a call with the second terminal, that is, the called terminal, and the first terminal uses the same user number in the CS network and the IMS network to initiate a call to the second terminal. , set up a call with him.
  • the UE-A uses the mobile phone to call the UE-B through the number 13480841952 on the IMS network, and the UE-A moves to the edge of the IMS network coverage, the UE-A initiates the network handover, and also uses the 13480841952 to call the UE-B in the CS network, when the UE -A releases the call originally in the IMS network after successfully establishing a call with the UE-B in the CS network.
  • a user can establish a call with the opposite user in both networks as long as one number is used.
  • the present embodiment is The IMS network in the system is used when the first terminal device is in the IMS network.
  • the user location information of the CS network is updated. In this way, when the calling user calls the user who uses the same number in the two networks, the location information of the user can be used to determine the network where the called user is located, and the network where the first terminal device is located establishes a call with the first terminal device. .
  • UE-A When UE-A is called, UE-B makes a call in the CS network as the calling party.
  • the basic process of the call is: UE-B initiates a call in the CS network;
  • the CS network queries the called UE-A user for current location information, and determines the network where the UE-A is located, such as in the IMS network; then routes the call to the IMS network to establish a call with the UE-A.
  • the main process of updating the user location of the CS network by the IMS network in this embodiment includes: storing, by the IMS network, user location information of the first terminal;
  • the IMS network sends a request message to a Home Location Register (HLR) located in the CS network, and notifies the HLR to update the user location information of the first terminal;
  • HLR Home Location Register
  • the HLR stores user location information of the first terminal obtained from the IMS network.
  • the specific process of updating the user location of the CS network by the IMS network is: D0010, the user initiates initial registration in the IMS domain;
  • the SCSCF after the user successfully registers with the CSCF, the SCSCF triggers the third party to register to the SSS according to the iFC triggering rule;
  • the third party is successfully registered, and the SSS initiates a MAP_Update_Location_Request request message to the Home Location Register (HLR) to notify the user of the current location information.
  • HLR Home Location Register
  • the HLR after receiving the MAP_Update_Location_Request initiated by the SSS, the HLR sends a MAP_Insert_Subscriber_Date_Request message to the SSS to obtain the current location information of the user, and the SSS returns a response message to the HLR by using the MAP_Insert_Subscriber_Data_Response message;
  • HLR successfully stores the user location information and returns the MAP_Update_Location_Response message, and the user registration is successful.
  • the called user roams to the IMS domain and the registration is successful.
  • the GMSC queries the HLR to obtain the current location information of the called user in the IMS domain, and routes the call request to the SCC AS;
  • the SCC AS adds the access code AC before the called number and sends it back;
  • the GMSC analyzes the AC routing request to the MGCF. After the MGCF removes the AC, the call request is routed to the IMS domain for corresponding service processing.
  • the above-mentioned SRVCC supports the same number of systems.
  • the main devices in the IMS network include: Service Continuity Server (SCC AS, Single Call Continity Application Server) and Call Session Control Function (CSCF, Call Session Control Function).
  • SCC AS Service Continuity Server
  • CSCF Call Session Control Function
  • the domain is switched to the CS domain.
  • the three scenarios including the handover, ringing state switching (calling;) and ringing state switching (called) in the normal call process with the same number are described in detail below.
  • the process in which the IMS network enables the first terminal device to establish a call between the CS network and the second terminal device is implemented by the SCC AS and the CSCF, and the first terminal device in the embodiment initiates the handover as the calling party: the SRVCC system user UE_A is in the CS.
  • the domain and the IMS domain use the same user number.
  • the UE_A is successfully registered in the IMS domain, and the call is established.
  • the UE_A is switched from the IMS domain to the CS domain.
  • the SRVCC user initiates a call after the CS domain is registered.
  • the called number is VDN.
  • the Call Session Control Function (CSCF) in the call routes the call to the SCC AS.
  • CSCF Call Session Control Function
  • the SCC AS queries the original IMS domain call, connects the current call to the original IMS domain call, and establishes a call with the original peer user.
  • SRVCC The user's original IMS domain call is released.
  • the MSC is generally used instead of the UE-A handover network.
  • the specific structure of the SRVCC is shown in FIG.
  • N0010 User 1 ⁇ _ is successfully registered in the 1 ⁇ « domain, and the SRVCC service is contracted; UE_A is in a call with UE_B, and UE_A initiates a domain handover; N0020, the MSC initiates a domain handover in the CS domain instead of the UE-A, and the called number is a VDN, indicating that the IMS domain call is switched to the CS domain;
  • CSCF triggers SCC AS according to PSI
  • the SCC AS performs domain switching, finds the UE-A original IMS domain call, and sends a Re-INVITE media switch to the original called party;
  • the MSC replaces the UE-A to complete the media negotiation with the UE-B in the original call;
  • the MSC enters the call with the UE-B in the CS domain instead of the UE-A.
  • SCC-AS releases the call of the original UE-A according to the timer (cannot be released immediately).
  • the timer cannot be released immediately.
  • FIG. 5 for a detailed signaling procedure. The switching process in the call process shown in FIG. 4 will be described below with reference to FIG. 5.
  • the UE-A sends a request message (INVITE B (SDP A Offer)) for calling the called UE_B to the CSCF through the IMS, and the CSCF forwards the INVITE message to the SCC-AS, and the SCC-AS sends a message confirming receipt of the INVITE to the CSCF.
  • the acknowledgment message includes the information about the UE_B; the CSCF directly initiates a call request to the UE_B through the INVITE message; the UE_B returns a 180 ringing message to the UE_A through the CSCF; the UE_B then returns a 200 OK message to the UE_A through the CSCF, and establishes an IMS domain call.
  • Request message initiate domain handover, the called number is VDN;
  • CSCF triggers SCC AS according to PSI;
  • SCC AS performs domain handover, finds UE-A original IMS domain call, initiates Re-INVITE media handover to original called party;
  • MSC replaces UE-A The media negotiation is completed with the UE-B in the original call; the MSC enters the call with the UE-B in the CS domain instead of the UE-A.
  • the SCC-AS releases the call of the original UE-A according to the timer.
  • UE_A receives the call of UE_B, and is in a ringing state, and UE_A needs to perform SRVCC handover because of the access network;
  • Z0020 the MSC initiates a domain handover in the CS domain instead of the UE-A, and the called number is a VDN, indicating that the IMS domain call is switched to the CS domain;
  • CSCF triggers SCC AS according to PSI
  • the SCC AS and the Remote (UE_B) are in a ringing state, and the SCC AS initiates a Re-INVITE media switching to the original called party through the UPDATE;
  • the SCC AS delivers session related information to the MSC by using an INFO message
  • UE_A picks up the phone in the CS access mode, and the MSC notifies the user to go off-hook through the INFO message.
  • the SCC AS sends a 200 OK of the INVITE to the UE-B, indicating that the user is off-hook.
  • Step 1 UE_A receives the call of UE_B and is in a ringing state
  • Step 2 UE_A moves to 3G and still rings; because of the access network, SRVCC switching is required;
  • Step 3 Step 4: The MSC initiates a domain handover in the CS domain instead of UE-A.
  • the called number is VDN, indicating that the IMS domain call is switched to the CS domain.
  • Step 4a-Step 8 the CSCF triggers the SCC AS according to the PSI; at this time, the SCC AS and the Remote (UE_B) are in a ringing state, and the SCC AS initiates a Re-INVITE media switching to the original called party through the UPDATE;
  • Steps 9 to 19 The SCC AS transmits the session related information to the MSC through the INFO message.
  • Step 20a to Step 35 the UE_A is off-hook in the CS access mode, and the MSC notifies the user to go off-hook through the INFO message.
  • the SCC AS sends a 200 OK of the INVITE to UE-B, indicating that the user is off-hook.
  • Step 36 to step 41 the SCC-AS releases the call of the original UE-A.
  • the user in the IMS domain and the CS domain have the same number. If the call initiated by the switching user (calling) is in the ringing state, the SRVCC switching needs to be performed, so that the called user picks up the phone, and the switching user can establish a call with the called party in the CS domain.
  • the specific process is as follows:
  • UE_A initiates a call to UE_B in the IMS domain; and after UE_B rings, UE_A needs to perform SRVCC handover due to wireless access.
  • the MSC initiates a domain handover in the CS domain instead of the UE-A, and the called number is a VDN, indicating that the IMS domain call is switched to the CS domain;
  • CSCF triggers SCC AS according to PSI
  • the SCC AS performs domain switching, finds the UE-A original IMS domain call, and sends the UPDATE update media to the remote end;
  • the SCC AS sends session related information to the MSC by using an INFO message.
  • the SCC-AS releases the call of the original UE-A according to the timer.
  • Step 1 to step 2 UE_A initiates a call to UE_B in the IMS domain; and after UE_B rings, UE_A needs to perform SRVCC handover for reasons of wireless access.
  • step 3 to step 4 the MSC initiates a domain handover in the CS domain instead of the UE-A.
  • the called number is VDN, indicating that the IMS domain call is switched to the CS domain.
  • Step 4a to Step 8 the CSCF triggers the SCC AS according to the PSI; the SCC AS performs domain switching, finds the UE-A original IMS domain call, and sends the UPDATE update media to the remote end;
  • Steps 9 to 19 The SCC AS sends the session related information to the MSC through the INFO message.
  • Step 20 to Step 23 the UE_B is off-hook, and the SCC AS sends the off-hook 200 OK to the MSC.
  • Step 24 to Step 33 the SCC-AS is released according to the timer.
  • the original UE-A call It is to be understood that the specific embodiments of the invention are limited only by the description. For the technical field to which the present invention pertains A person skilled in the art can make some simple deductions or substitutions without departing from the inventive concept, and should be considered as belonging to the scope of protection of the present invention.
  • the invention enables the terminal to use the same user number when the network is switched, which is convenient for the user to use; when the first terminal device acts as the calling party to switch the network, the same user number is used to establish a call with the second terminal device in different networks. , improving the working efficiency of the SRVCC system; and when the first terminal device is called, the IMS network saves the user location information and updates the user location information in the CS network HLR, so that when the second terminal device calls the first terminal device, By establishing a call with the first terminal on the initial network where the first terminal device is located, the problem that the network brought by the first terminal using the same user number cannot be identified is solved.

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Abstract

本发明提供了一种SRVCC支持同号的系统及方法。本发明的SRVCC支持同号的方法包括：IMS网络、CS网络、第一终端设备和第二终端设备；第一终端设备用于使用用户号码在IMS网络与所述第二终端设备建立通话，还用于当其为主叫，从IMS网络切换到CS网络时，使用所述用户号码在CS网络与所述第二终端设备建立通话。该方法能够提高SRVCC系统在域切换时使用同一个号码在不同的网络中建立通话，提高SRVCC系统的工作效率，方便用户使用。

Description

一种 SRVCC支持同号的系统及方法 技术领域
本发明涉及无线通信领域，尤其涉及到一种 SRVCC支持同号的系统及 方法。 背景技术
网际协议多媒体子系统（ IMS , IP Multimedia Subsystem )是未来多媒 体通信的发展方向， 也是下一代网络最为重要的组成部分。 它是第三代合 作伙伴计划 ( 3GPP, Third Generation Partnership Project )提出的支持 IP多 媒体业务的子系统，其显著特征是采用了会话初始协议 ( SIP, Session Initial Protocol )体系， 通信与接入方式无关， 可以具备多种多媒体业务控制功能 与承载能力分离、 呼叫与会话分离、 应用与服务分离、 业务与网络分离， 以及移动网与因特网业务融合等多种能力。
SRVCC ( Single Radio Voice Call Continuity )是 3GPP提出的一种 VoLTE语音业务连续性方案，主要是为了解决当单射频 UE在 LTE/Pre-LTE 网络和 2G/3G CS 网络之间移动时， 如何保证语音呼叫连续性的问题， 即 保证单射频 UE在 IMS控制的 VoIP语音和 CS 域语音之间的平滑切换。 SRVCC对应 Single Radio的 UE,即 UE只能在同一时间使用 2G/3G的 Radio、 LTE的 Radio中的一种， SR的需求是终端厂商提出的，其目的是复用 2G/3G、 LTE网络的射频和相关电路。 SRVCC因为 Single Radio而带来的特有性质： Radio之间的切换很快， 但是在切换前， 需要将 CS相关的网络侧通道建立 好， 将远端更新好。
SRVCC 的切换， 在流程设计上， 先进行 CS 的通道创建及 Remote Update, 之后进行 PS to CS Handover; 漫游情况下， Remote Update耗时是 秒级的。
3GPP定义的 SRVCC系统， 涉及在切换时， 用户必须在 IMS和 CS网 络使用两个不同的用户号码， 使得 SRVCC系统工作效率低下， 另一方面在 实际运营中， 给用户带来了不便。 发明内容
本发明要解决的主要技术问题是，提供一种 SRVCC支持同号的系统及 方法， 能够提高 SRVCC系统工作效率， 方便用户使用。
为解决上述技术问题， 本发明提供一种 SRVCC支持同号的方法， 具体 技术方案如下：
一种 SRVCC支持同号的方法， 包括：
第一终端设备使用用户号码在 IMS网络与第二终端设备建立通话； 当第一终端设备作为主叫， 并且第一终端设备从 IMS 网络切换到 CS 网络时，第一终端设备使用所述用户号码在 CS网络与所述第二终端设备建 立通话。
优选地， 所述 SRVCC 支持同号的方法还包括： 第一终端设备在 IMS 网络在初始注册时， IMS网络更新 CS网络的用户位置信息。
优选地， 所述 SRVCC支持同号的方法还包括： 当第二终端设备作为主 叫在 IMS网络或 CS网络呼叫第一终端时， IMS网络或 CS网络查询用户位 置信息， 判断第一终端设备所处的网络， 并且在该网络中与第一终端设备 建立通话。
优选地， 第一终端设备从 IMS网络切换到 CS网络时， 第一终端设备 使用所述用户号码在 CS 网络与所述第二终端设备建立通话的具体过程包 括：
第一终端设备使用所述用户号码在 CS网络中和 SCC AS建立呼叫； CSCF触发 SCC AS; SCC AS查询原 IMS网络呼叫， 将当前呼叫接续到原 IMS网络呼叫， 并建立与第二终端设备的通话， 释放原 IMS域呼叫。
优选地， 所述 IMS网络更新 CS网络的用户位置信息的过程包括： IMS网络存储第一终端的用户位置信息；
IMS网路发送请求消息给位于 CS网络的 HLR, 通知 HLR更新第一终 端的用户位置信息；
HLR存储从 IMS网络中获取的第一终端的用户位置信息。
同样为了解决上述的技术问题，本发明还提出了一种 SRVCC支持同号 的系统， 其具体的技术方案如下：
一种 SRVCC支持同号的系统， 包括： IMS网络、 CS网络、 第一终端 设备和第二终端设备；
第一终端设备配置为使用用户号码在 IMS网络与所述第二终端设备建 立通话，
还配置为当所述第一终端设备为主叫， 从 IMS网络切换到 CS网络时， 使用所述用户号码在 CS网络与所述第二终端设备建立通话。
优选地， 所述 IMS网络配置为当第一终端设备在 IMS网络在初始注册 时， 更新 CS网络的用户位置信息。
优选地， 所述第二终端设备配置为在 IMS网络或 CS呼叫第一终端设 备； 所述 IMS网络或 CS网络配置为当接收第二终端设备作为主叫对第一 终端设备的呼叫时， 查询用户位置信息， 判断第一终端设备所处的网络， 在第一终端设备所处的网络与第一终端设备建立呼叫。
优选地，所述 IMS网络包括 SCC AS和 CSCF; 所述第一终端设备配置 为使用所述用户号码在 CS网络中和 SCC AS建立呼叫， 所述 CSCF配置为 触发所述 SCC AS, 所述 SCC AS配置为查询原 IMS域呼叫， 将当前呼叫接 续到原 IMS网络呼叫，建立与第二终端设备的通话，释放原 IMS网络呼叫。 优选地， 所述 CS网络包括 HLR; 所述 IMS网络用于存储第一终端的 用户位置信息， 发送请求消息给位于 CS网络的 HLR, 通知 HLR更新第一 终端的用户位置信息；所述 HLR用于从 IMS网络中获取的第一终端的用户 位置信息， 并存储第一终端的用户位置信息。
本发明的有益效果是：
本发明的 SRVCC支持同号的系统及方法， 使终端在网络切换时， 使用 同一个用户号码， 方便用户的使用； 在系统中第一终端设备作为主叫切换 网络时， 使用同一个用户号码在不同网络中与第二终端设备建立呼叫， 提 高 SRVCC系统的工作效率； 同时当第一终端设备作为被叫时， IMS网络保 存用户位置信息并更新 CS网络 HLR中的用户位置信息， 使得第二终端设 备在呼叫第一终端设备时， 能够通过在第一终端设备所在的初始网络， 与 第一终端建立呼叫， 解决第一终端使用同一个用户号码带来的网络不能别 识别的问题。 附图说明
图 1为本发明实施例 SRVCC支持同号的系统的一种结构示意图； 图 2为本发明实施例 SRVCC支持同号的系统 IMS网络更新 CS网络用 户位置的流程图；
图 3为本发明实施例 SRVCC支持同号的系统的另一种结构示意图； 图 4为本发明实施例 SRVCC支持同号的系统第一终端设备正常呼叫的 域切换流程图；
图 5为本发明实施例 SRVCC支持同号的系统第一终端设备正常呼叫的 切换的信令交互示意图；
图 6为本发明施例 SRVCC支持同号的系统第一终端设备为被叫时的域 切换流程图；
图 7为本发明施例 SRVCC支持同号的系统第一终端设备为被叫时切换 的信令交互示意图；
图 8为本发明施例 SRVCC支持同号的系统第一终端设备为主叫时的域 切换流程图；
图 9为本发明施例 SRVCC支持同号的系统第一终端设备为被主时切换 的信令交互示意图。 具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
请参考图 1 , 为本实施例 SRVCC支持同号的系统， 包括： IMS网络、 CS网络、 第一终端设备和第二终端设备；
第一终端设备配置为使用用户号码在 IMS网络与所述第二终端设备建 立通话， 还配置为当其为主叫， 从 IMS网络切换到 CS网络时， 使用所述 用户号码在 CS网络与所述第二终端设备建立通话。
本实施例中的第一终端设备作为主叫时使用用户号码在 IMS网络中呼 叫第二终端设备， 若由于 IMS网络原因， 第一终端设备需要切换网络时， 即从 IMS网络切换到 CS网络时，第一终端使用先前的用户号码在 CS网络 中发起呼叫， 与第二终端即被叫建立通话， 该第一终端在 CS 网络和 IMS 网络中使用同一个用户号码， 发起对第二终端的呼叫， 与其建立通话。 如 UE-A使用手机在 IMS网络通过号码 13480841952呼叫 UE-B, UE-A移动 待 IMS 网络覆盖的边缘时， UE-A发起网络切换， 同样使用 13480841952 在 CS网络中呼叫 UE-B, 当 UE-A在 CS网络中与 UE-B成功建立通话后， 释放原来在 IMS网络中的呼叫。 使用本实施例的系统用户可以只要一个号 码在两种网络中与对端用户建立通话。
由于第一终端设备在两个网络中使用同一个号码， 在作为被叫方时， 主叫方不知道从哪个网络呼叫第一终端， 为了解决第一终端设备的基本呼 叫问题， 本实施例的系统中的 IMS网络用于当第一终端设备在 IMS网络在 初始注册时， 更新 CS网络的用户位置信息。 这样主叫用户在呼叫在两个网 络中使用同一个号码的用户时， 可以通过用户的位置信息， 判断被叫用户 所处网络， 在第一终端设备所处的网络与第一终端设备建立呼叫。 当 UE-A 作为被叫， UE-B做为主叫在 CS网络中发起呼叫， 呼叫的基本的过程是： UE-B在 CS网络中发起呼叫；
CS网络查询被叫 UE-A用户当前位置信息， 判断 UE-A所处的网络， 如在 IMS网络； 则将呼叫路由到 IMS网络与 UE-A建立通话。
本实施例的 IMS网络更新 CS网络的用户位置的主要过程包括： IMS网络存储第一终端的用户位置信息；
IMS网路发送请求消息给位于 CS网络的归属位置寄存器（HLR, Home Location Register ) , 通知 HLR更新第一终端的用户位置信息；
HLR存储从 IMS网络中获取的第一终端的用户位置信息。
参考图 2, 具体的 IMS网络更新 CS网络的用户位置具体过程为： D0010, 用户在 IMS域发起初始注册；
D0020, 用户在 CSCF注册成功后， SCSCF根据 iFC触发规则触发第 三方注册到 SSS;
N0030 第三方注册成功， SSS向归属位置寄存器（ HLR, Home Location Register )发起 MAP_Update_Location_Request请求消息， 通知用户当前位 置信息；
D0040, HLR收到 SSS发起的 MAP_Update_Location_Request后向 SSS 发送 MAP_Insert_Subscriber_Date_Request 消息请求获取用户当前位置信 息， SSS 以 MAP_Insert_Subscriber_Data_Response 消息返回响应消息给 HLR;
D0050 , HLR 成 功 存 储 用 户 位 置 信 息 后 返 回 MAP_Update_Location_Response消息， 用户注册成功。 被叫用户漫游至 IMS域且注册成功， 主叫从 CS域发起呼叫时， 具体 的过程如下：
GMSC查询 HLR获取被叫用户当前位置信息在 IMS域，将呼叫请求路 由到 SCC AS;
由 SCC AS在被叫号码前添加接入码 AC后送回；
GMSC分析 AC路由请求至 MGCF, MGCF去掉 AC后呼叫请求路由 到 IMS域进行对应业务处理。
上述 SRVCC支持同号的系统在 IMS网络中主要的设备包括： 业务连 续性服务器（SCC AS, Single Call Continity Application Server ) 和呼叫会 话控制功能（CSCF, Call Session Control Function )来实现的， 用户从 IMS 域切换到 CS域， 包含同号情况下的正常呼叫过程中切换、 振铃态切换（主 叫；)、 振铃态切换（被叫）三个场景以下分别详细说明。
IMS 网络使第一终端设备在 CS 网络与第二终端设备建立通话是通过 SCC AS和 CSCF来实现的本实施例中的第一终端设备作为主叫发起切换的 过程为： SRVCC系统用户 UE_A在 CS域和 IMS域同号使用同一个用户号 码， UE_A在 IMS域注册成功， 并且建立呼叫， UE_A从 IMS域切换到 CS 域， SRVCC用户在 CS域注册后发起呼叫， 被叫号码为 VDN; IMS域中的 呼叫会话控制功能（ CSCF, Call Session Control Function )将呼叫路由到 SCC AS, SCC AS查询到原 IMS域呼叫， 将当前呼叫接续到原 IMS域呼叫， 建 立与原对端用户的通话， SRVCC用户原 IMS域呼叫释放。 在实际的切换过 程中一般使用 MSC来代替 UE-A切换网络， 该 SRVCC的具体结构如图 3 所示。
参考图 4在实际中正常呼叫过程中切换的具体过程为：
N0010, 用户 1^_ 在1^«域注册成功， 且签约 SRVCC业务； UE_A 与 UE_B处于通话中， UE_A发起域切换； N0020 , MSC在 CS域代替 UE-A发起域切换， 被叫号码为 VDN, 表 示由 IMS域呼叫切换到 CS域；
N0030 , CSCF按照 PSI触发 SCC AS；
N0040 , SCC AS进行域切换， 找到 UE-A原 IMS域呼叫， 向原被叫发 起 Re-INVITE媒体切换；
N0050 , MSC代替 UE-A与原通话中的 UE-B完成媒体协商；
N0060 , MSC代替 UE-A在 CS域与 UE-B进入通话。
N0070 , SCC-AS根据定时器（不能立即释放 )释放原 UE-A的呼叫。 详细的信令流程参考图 5。 以下结合图 5 , 对图 4所示呼叫过程中切换 流程进行说明。
UE-A通过 IMS向 CSCF发送呼叫被叫 UE_B的请求消息 （INVITE B ( SDP A Offer ) ), CSCF向将该 INVITE消息转发给 SCC-AS , SCC-AS向 CSCF发送确认接收到 INVITE的消息，确认消息中包含 UE_B的相关信息； CSCF通过 INVITE消息向 UE_B直接发起呼叫请求； UE_B通过 CSCF向 UE_A回 180振铃消息； UE_B再通过 CSCF向 UE_A回 200OK消息， 并 建立 IMS域呼叫。 求消息，发起域切换，被叫号码为 VDN; CSCF按照 PSI触发 SCC AS; SCC AS进行域切换， 找到 UE-A原 IMS域呼叫， 向原被叫发起 Re-INVITE媒 体切换； MSC代替 UE-A与原通话中的 UE-B完成媒体协商； MSC代替 UE-A在 CS域与 UE-B进入通话。 SCC-AS根据定时器释放原 UE-A的呼叫。
本实施例中的当 UE-A为被叫时即处于振铃态， 由于某些网络原因，也 需要切换到其他网络中进行通话， 具体的切换过程如下， 参考图 6:
Z0010, UE_A收到 UE_B的呼叫， 并处于振铃态， UE_A因为接入网 的原因， 需要进行 SRVCC切换； Z0020, MSC在 CS域代替 UE-A发起域切换， 被叫号码为 VDN, 表 示由 IMS域呼叫切换到 CS域；
Z0030, CSCF按照 PSI触发 SCC AS;
Z0040, 此时 SCC AS与 Remote ( UE_B )之间处于振铃态， SCC AS 通过 UPDATE , 向原被叫发起 Re-INVITE媒体切换；
Z0050, SCC AS通过 INFO消息向 MSC传递会话相关信息；
Z0060, UE_A在 CS接入方式下摘机， MSC通过 INFO消息通知用户 摘机。 SCC AS向 UE-B发送 INVITE的 200 OK, 表示用户摘机。
Z0070, SCC-AS释放原 UE-A的呼叫。
Z0080, 用例结束。
具体的信令交互的过程参考图 7。 以下结合图 7, 对振铃状态下的切换 流程进行说明。
步驟 1 , UE_A收到 UE_B的呼叫， 并处于振铃态；
步驟 2, UE_A移动至 3G,仍振铃；因为接入网的原因，需要进行 SRVCC 切换；
步驟 3-步驟 4, MSC在 CS域代替 UE-A发起域切换，被叫号码为 VDN, 表示由 IMS域呼叫切换到 CS域；
步驟 4a-步驟 8, CSCF按照 PSI触发 SCC AS; 此时 SCC AS与 Remote ( UE_B )之间处于振铃态， SCC AS通过 UPDATE,向原被叫发起 Re-INVITE 媒体切换；
步驟 9至步驟 19, SCC AS通过 INFO消息向 MSC传递会话相关信息； 步驟 20a至步驟 35 , UE_A在 CS接入方式下摘机， MSC通过 INFO 消息通知用户摘机。 SCC AS向 UE-B发送 INVITE的 200 OK, 表示用户摘 机。
步驟 36至步驟 41 , SCC-AS释放原 UE-A的呼叫。 用户在 IMS域和 CS域同号， 对于切换用户 （主叫）发起的呼叫处于 振铃态， 也需要能进行 SRVCC切换， 使得被叫用户摘机， 切换用户在 CS 域可以与被叫建立通话， 参考图 8, 具体过程如下：
M0010, UE_A在 IMS域中发起呼叫到 UE_B; 并在 UE_B振铃后， UE_A因为无线接入的原因需要进行 SRVCC切换。
M0020, MSC在 CS域代替 UE-A发起域切换， 被叫号码为 VDN, 表 示由 IMS域呼叫切换到 CS域；
M0030, CSCF按照 PSI触发 SCC AS;
M0040, SCC AS进行域切换， 找到 UE-A原 IMS域呼叫， 向远端发送 UPDATE更新媒体；
M0050, SCC AS通过 INFO消息向 MSC发送会话相关信息；
M0060, UE_B摘机， SCC AS向 MSC发送摘机 200OK;
M0070, SCC-AS根据计时器释放原 UE-A的呼叫。
具体的信令交互的过程参考图 9。
步驟 1至步驟 2, UE_A在 IMS域中发起呼叫到 UE_B; 并在 UE_B振 铃后， UE_A因为无线接入的原因需要进行 SRVCC切换。
步驟 3至步驟 4, MSC在 CS域代替 UE-A发起域切换， 被叫号码为 VDN, 表示由 IMS域呼叫切换到 CS域；
步驟 4a至步驟 8, CSCF按照 PSI触发 SCC AS; SCC AS进行域切换， 找到 UE-A原 IMS域呼叫 , 向远端发送 UPDATE更新媒体；
步驟 9至步驟 19, SCC AS通过 INFO消息向 MSC发送会话相关信息； 步驟 20至步驟 23 , UE_B摘机， SCC AS向 MSC发送摘机 200OK; 步驟 24至步驟 33 , SCC-AS根据计时器释放原 UE-A的呼叫。 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单 推演或替换， 都应当视为属于本发明的保护范围。
工业实用性
本发明使终端在网络切换时， 使用同一个用户号码， 方便用户的使用； 在系统中第一终端设备作为主叫切换网络时， 使用同一个用户号码在不同 网络中与第二终端设备建立呼叫， 提高 SRVCC系统的工作效率； 同时当第 一终端设备作为被叫时， IMS网络保存用户位置信息并更新 CS网络 HLR 中的用户位置信息， 使得第二终端设备在呼叫第一终端设备时， 能够通过 在第一终端设备所在的初始网络， 与第一终端建立呼叫， 解决第一终端使 用同一个用户号码带来的网络不能别识别的问题。

Claims

权利要求书
1.一种 SRVCC支持同号的方法， 包括：
第一终端设备使用用户号码在 IMS网络与第二终端设备建立通话； 当第一终端设备作为主叫， 并且第一终端设备从 IMS 网络切换到 CS 网络时，第一终端设备使用所述用户号码在 CS网络与所述第二终端设备建 立通话。
2.根据权利要求 1所述的 SRVCC支持同号的方法， 其中， 还包括： 第一终端设备在 IMS网络在初始注册时， IMS网络更新 CS网络的用 户位置信息。
3.根据权利要求 2所述的 SRVCC支持同号的方法， 其中， 还包括： 当第二终端设备作为主叫在 IMS网络或 CS网络呼叫第一终端时， IMS 网络或 CS网络查询用户位置信息， 判断第一终端设备所处的网络， 并且在 该网络中与第一终端设备建立通话。
4.根据权利要求 1或 2所述的 SRVCC支持同号的方法， 其中， 第一终 端设备从 IMS网络切换到 CS网络时， 第一终端设备使用所述用户号码在 CS网络与所述第二终端设备建立通话， 包括：
第一终端设备使用所述用户号码在 CS网络中和 SCC AS建立呼叫； CSCF触发 SCC AS;
SCC AS查询原 IMS网络呼叫， 将当前呼叫接续到原 IMS网络呼叫， 并建立与第二终端设备的通话， 释放原 IMS域呼叫。
5.根据权利要求 2或 3所述的 SRVCC支持同号的方法，其中，所述 IMS 网络更新 CS网络的用户位置信息， 包括：
IMS网络存储第一终端的用户位置信息；
IMS网路发送请求消息给位于 CS网络的 HLR, 通知 HLR更新第一终 端的用户位置信息； HLR存储从 IMS网络中获取的第一终端的用户位置信息。
6.—种 SRVCC支持同号的系统， 包括： IMS网络、 CS网络、 第一终 端设备和第二终端设备；
第一终端设备配置为使用用户号码在 IMS网络与所述第二终端设备建 立通话，
还配置为当第一终端设备为主叫， 从 IMS网络切换到 CS网络时， 使 用所述用户号码在 CS网络与所述第二终端设备建立通话。
7.根据权利要求 6所述的 SRVCC支持同号的系统， 其中， 所述 IMS 网络配置为当第一终端设备在 IMS网络在初始注册时， 更新 CS网络的用 户位置信息。
8.根据权利要求 7所述的 SRVCC支持同号的系统， 其中， 所述第二终 端设备配置为在 IMS网络或 CS呼叫第一终端设备； 所述 IMS网络或 CS 网络配置为当接收第二终端设备作为主叫对第一终端设备的呼叫时， 查询 用户位置信息， 判断第一终端设备所处的网络， 在第一终端设备所处的网 络与第一终端设备建立呼叫。
9.根据权利要求 6或 7所述的 SRVCC支持同号的系统，其中，所述 IMS 网络包括 SCC AS和 CSCF; 所述第一终端设备用于使用所述用户号码在 CS网络中和 SCC AS建立呼叫， 所述 CSCF用于触发所述 SCC AS, 所述 SCC AS用于查询原 IMS域呼叫， 将当前呼叫接续到原 IMS网络呼叫， 建 立与第二终端设备的通话， 释放原 IMS网络呼叫。
10. 根据权利要求 7或 8所述的 SRVCC支持同号的系统， 其中， 所述 CS网络包括 HLR; 所述 IMS网络用于存储第一终端的用户位置信息， 发 送请求消息给位于 CS网络的 HLR, 通知 HLR更新第一终端的用户位置信 息； 所述 HLR用于从 IMS网络中获取的第一终端的用户位置信息， 并存储 第一终端的用户位置信息。
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EP13828408.8A EP2843995A4 (en) 2012-08-09 2013-06-25 SYSTEM AND METHOD FOR SUPPORTING THE SAME NUMBER USING SRVCC
JP2015516436A JP2015523796A (ja) 2012-08-09 2013-06-25 Ｓｒｖｃｃで同じ番号をサポートするシステム及び方法
KR1020157004995A KR20150038388A (ko) 2012-08-09 2013-06-25 Srvcc가 동일한 번호를 지원하는 시스템 및 방법
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