WO2008028416A1 - Procédé de commande de transfert intercellulaire d'appel et système de communication mettant en oeuvre ce procédé et dispositif utilisateur - Google Patents

Procédé de commande de transfert intercellulaire d'appel et système de communication mettant en oeuvre ce procédé et dispositif utilisateur Download PDF

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Publication number
WO2008028416A1
WO2008028416A1 PCT/CN2007/070314 CN2007070314W WO2008028416A1 WO 2008028416 A1 WO2008028416 A1 WO 2008028416A1 CN 2007070314 W CN2007070314 W CN 2007070314W WO 2008028416 A1 WO2008028416 A1 WO 2008028416A1
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WO
WIPO (PCT)
Prior art keywords
call
user equipment
state
handover
information
Prior art date
Application number
PCT/CN2007/070314
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English (en)
French (fr)
Inventor
Shuiping Long
Jie Xu
Yi Zhang
Fang You
Original Assignee
Huawei Technologies Co., Ltd.
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.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to AT07764241T priority Critical patent/ATE504176T1/de
Priority to EP07764241A priority patent/EP2071855B1/en
Priority to DE602007013584T priority patent/DE602007013584D1/de
Priority to CN200780000274A priority patent/CN100584122C/zh
Publication of WO2008028416A1 publication Critical patent/WO2008028416A1/zh

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Classifications

    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a call handover control method and a communication system, and a user equipment.
  • Voice Call Continuity allows users to maintain continuity of calls while moving between various access technologies. For example, users from traditional 2G networks (such as Global System for Mobile Communications (GSM, Global) System for Mobile communications), Code Division Multiple Access (CDMA), mobile to 3G networks (Universal Mobile Telecommunications System (UMTS), High Speed Packet Data System (HRPD, High Rate Packet) When Data ) ), the call continues and other 3G services can be initiated, such as high-speed Internet access.
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • UMTS Universal Mobile Telecommunications System
  • HRPD High Speed Packet Data System
  • HRPD High Rate Packet
  • High Rate Packet High Rate Packet
  • the VCC technology is based on the Internet Protocol Multimedia Subsystem (IMS), which is a network located on the IP access network (the PS domain part of the UMTS, the HRPD network or the Wireless Local Area Network (WLAN)). IMS provides basic business functions, and operators can develop various services based on this.
  • IMS Internet Protocol Multimedia Subsystem
  • CS circuit switched
  • VCC AS VCC application server
  • the network element that the IMS enters into the CS network is the Media Gate - Way Control Function (MGCF), and the MGCF also controls the route that the MGW carries.
  • MGCF Media Gate - Way Control Function
  • the voice switching to the WLAN may be initiated due to the deterioration of the CS network wireless environment or the IMS priority.
  • the specific process is as follows: 101. If the user equipment (UE, User Equipment) does not perform IMS registration, perform registration.
  • UE User Equipment
  • the UE initiates a voice switch to the WLAN, and sends an IMS call to the address identifier associated with the VCC AS.
  • the UE sends an invite message (INVITE) message to the Proxy Call Session Control Function (P-CSCF), and then arrives.
  • P-CSCF Proxy Call Session Control Function
  • S - CSCF Serving Call Session Control Function
  • the S-CSCF forwards the INVITE message to the VCC AS based on the initial filter Criteria, the address identifier associated with the VCC AS, and the P-Asserted-identity header (including the CS domain mobility of the UE).
  • the MDN Mobile Directory Number
  • the VCC AS sends a re-INVITE message to the remote end (Other End Point, including the network and the user equipment) through the S-CSCF, where the re-INVITE message includes the UE's new WLAN call session.
  • Description Protocol SDP, Service Description Protocol
  • the remote response is 200 OK, and finally arrives at the UE.
  • the UE sends an ACK, and finally reaches the remote end, and the session initiation protocol between the UE and the VCC AS
  • the VCC AS After receiving the ACK, the VCC AS sends an End (BYE) message to the MGCF through the S-CSCF to clear the CS voice call (SIP Call Conversation 2).
  • CS voice call between the Mobile Switching Center (MSC) and the UE is released, and the MGCF returns 200 OK to the VCC AS.
  • MSC Mobile Switching Center
  • the current VCC handover assumption is made in a call state, and does not consider factors such as ringing/ringback tone (called/calling situation)/holding non-call state, for example, when the UE is called during ringing, The UE initiates the calling process, and the real user off-hook signal cannot be transmitted. When the UE caller switches, the UE also initiates the calling process. At this time, the ringing tone (such as the CRBT) may be confusing; Switching is too complicated.
  • the embodiments of the present invention provide a call handover control method and a communication system, and a user equipment, which is used to prevent the user equipment from switching in a non-talk state such as ringing/ringback tone/hold.
  • the network side-based call handover control method provided by the embodiment of the present invention includes: receiving and using The switching request of the user equipment determines whether the call is in a call state, and if so, allows the handover, and if not, performs exception processing.
  • the user-side call handover control method includes: the user equipment determines whether the call is in a call state, and if yes, initiates a handover request, and if not, continues to make a call under the current network; the Internet Protocol Multimedia Subsystem If the network receives the handover request, the network device switches the user equipment.
  • the communication system includes: a user equipment, configured to send a handover request to a voice call continuity server; a voice call continuity server, configured to receive the handover request, and if it is determined that the call is in a call state, Allow switching. If it is determined that the call is in a non-talking state, exception handling is performed.
  • the user equipment provided by the embodiment of the present invention includes: an information collection unit, configured to collect handover information, and send the handover information to a handover decision unit; and a handover decision unit, configured to determine a call according to the received handover information. After the call is in progress, the switch request is initiated, and when the call is disconnected, the call is continued on the current network.
  • the embodiments of the present invention have the following advantages:
  • the embodiment of the present invention when the user requests the handover, it is first determined whether the call is in a call state, and if the call is not in the call state, the handover is refused. Therefore, the embodiment of the present invention can effectively prevent the user from ringing/ringback/maintaining. Wait for the call state to switch;
  • the method of the embodiment of the present invention can be used for the GSM network, the UMTS network, and the CDMA network, thereby improving the adaptability of the method of the present invention
  • the method of the embodiment of the present invention proposes various judgment modes for judging the ring back tone and the call hold state in the CDMA network, thereby improving the flexibility of the method of the present invention.
  • FIG. 2 is a general flowchart of a call handover control method according to an embodiment of the present invention
  • FIG. 3 is a flow chart of a UE calling party in a GSM/UMTS network
  • FIG. 4 is a flow chart of a UE calling party in a prior art CDMA network
  • FIG. 5 is a flow chart of a call sent by an MSC to send off-hook information according to an embodiment of the present invention
  • FIG. 6 is a flow chart of a call for sending off-hook information of a VCC AS according to an embodiment of the present invention
  • 7(a) to (b) are schematic diagrams of systems according to an embodiment of the present invention.
  • Embodiments of the present invention provide a call handover control method and a communication system, and a user equipment, for preventing a user from switching in a non-talk state such as ringing/ringback tone/hold.
  • the flow of the call handover control method based on the network side in the embodiment of the present invention is as follows:
  • the user equipment initiates a handover request.
  • the user equipment When the user moves to a different network coverage, the user equipment detects a change in the network status, thereby initiating a handover request; or the user actively requests the handover, and initiates a handover request through the user equipment.
  • step 202 determining whether the call is in a call state, if yes, then proceeding to step 203, if not, then proceeding to step 204;
  • the exception handling may be to reject the handover, or to save the handover request and feed back the waiting message to the user equipment, and wait until the call is in the call state before processing the handover request.
  • the embodiment of the present invention needs to determine whether the current call is in a call state before performing the handover, and rejects the handover request if not in the call state, thereby effectively preventing the user from ringing/ringback/holding, etc. Switching is not in the call state.
  • the embodiment of the present invention further provides a call handover control method based on the user side, where the method determines the handover right to the user side, that is, the user equipment, that is, the user equipment detects the state of the call, only when When the call is in the call state, the handover request is initiated.
  • the Internet Protocol Multimedia Subsystem network receives the request initiated by the user equipment, it does not judge but directly switches.
  • Embodiment 1 Call switching control of IMS to CS:
  • the high-speed IP access network generally covers the hotspot. When the UE leaves the hotspot area, it should maintain call continuity and smoothly switch to the CS network.
  • the UE uses the SIP protocol to perform signaling interaction, and can obtain the current state of the call through the signaling message, such as ringing, ring back tone, hold, or pass.
  • the signaling message such as ringing, ring back tone, hold, or pass.
  • the state of the voice so the UE can directly judge the current state.
  • Embodiment 2 Call switching control of ringing state in the case of CS to IMS:
  • the UE During the ringing period of the called party (the local user has not accepted the call), the UE knows the status of the call. Therefore, when the UE makes a VCC handover decision, it should judge whether the local user accepts the call to prevent CS to IMS switching during ringing. .
  • the CS handover to the IMS means: after the UE enters the hotspot area, the voice service is switched to the IMS IP access network, and the high-speed data service can be initiated, and the cost ratio of the IP phone (VoIP) is
  • the voice service of the CS network is low.
  • Embodiment 3 CS to IMS
  • the call switching control of the ring back tone state is:
  • the MSC connected by the calling UE sends a connection indicating that the called user picks up the phone to the calling user (Connect).
  • the message so the calling UE can judge the current state as the call state according to the message.
  • the called UE connects to the MSC or the visited location register (VLR, Visitor
  • the MSC/VLR connected to the called UE sends an address complete message (ACM message) to the MSC/VLR connected to the calling UE to notify the called party that it is ringing;
  • ACM message address complete message
  • the MSC/VLR connected to the calling UE reminds the calling UE that the current call state is a ringback tone state.
  • the called UE sends a Connect message to the MSC/VLR connected thereto.
  • the MSC/VLR of the called party sends a response message (ANM message) to the MSC/VLR connected to the calling UE, to notify the called party that the off-hook has been off-hook;
  • NAM message response message
  • the MSC/VLR connected to the calling UE reminds the calling UE that the current call state is a call state.
  • the UE when the UE performs the VCC handover decision, it is determined whether the off-hook information is received (that is, whether it is in a call state), and the handover is not allowed if it is not received.
  • the off-hook information is implemented:
  • the MSC connected by the calling UE does not send the off-hook information, so the UE cannot distinguish the ring back tone and the call state.
  • the prior art process is as follows:
  • the called UE prompts that the MSC/VLR allocation is completed.
  • the called party MSC/VLR sends an ACM message to the MSC/VLR connected to the calling UE to notify that the current state is that the called party is ringing, that is, the calling party receives the ring back tone;
  • the called UE When the called UE picks up the phone, the called UE sends a Connect message to the MSC/VLR to prompt the called party to go off-hook;
  • the MSC/VLR of the called party sends an ANM message to the MSC/VLR to which the calling UE is connected, and has notified that the current state is a call state.
  • the MSC sends the off-hook information: After receiving the off-hook message (ANM/CON), the MSC notifies the UE, such as extending the existing Flash with information message, boosts. Support for a new Information Record.
  • the UE sends an initial call message.
  • the MSC invokes an initial call WIN trigger to obtain routing information.
  • the CS side of the VCC AS receives the MAP ORREQ as an SCP (Caller Request MAP Message);
  • the VCC AS saves the MDN and the CdPN (called telephone number) for the subsequent call setup, and returns the IMS routing number of the VCC AS.
  • the MSC/VLR sends an ISUP IAM message to the MGCF of the UE visited network, where the routing information of the UE (ie, the IMS routing number of the CdPN field and the UE MDN of the CgPN field) and a PCM/TDM trunk (which will be used to connect the MSC and the MGW) are included. );
  • the MGCF requests the MGW to connect to the PCM/TDM trunk and allocate an ephemeral termination to connect to the OEP (Other End Point, peer).
  • the MGCF sends an INVITE to the I-CSCF.
  • the Request URI header there is an address identifier associated with the VCC AS (an E.164 number), and the P-Asserted-ID header has the MDN of the UE.
  • I - CSCF sends the INVITE to the VCC AS;
  • the VCC AS sends an INVITE message to the I-CSCF, where the routing information of the UE is included.
  • Request The URI header now contains the MDN of the UE, and the P - Asserted - ID contains the CdPN saved in step 502;
  • the I-CSCF queries the HSS to obtain an S-CSCF address allocated to the UE at the time of registration, and sends an INVITE to the S-CSCF. Based on the filtering policy, the S-CSCF sends a SIP INVITE message to the VCC AS, which includes routing information of the UE;
  • VCC AS as a back-to-back user agent (B2BUA) and create a new call conversation 2, return INVITE to S-CSCF;
  • B2BUA back-to-back user agent
  • the S-CSCF sends an INVITE to the OEP.
  • the OEP responds to the SIP 180 Ringing message, and finally reaches the MGCF, and includes the SDP information of the OEP.
  • the MGCF modifies the MGW ephemeral termination according to the OEP SDP and sends the ISUP.
  • the MSC/VLR sends a channel allocation message to the UE.
  • the UE captures an lx service channel.
  • the OEP answers the call and returns a SIP 200 OK message to the MGCF;
  • the MGCG sends an ISUP ANM message to the MSC/VLR.
  • the MSC sends a Flash With Information message to the UE, and carries the remote off-hook information.
  • the MGCF sends a SIP ACK message to the OEP, which completes the call conversation between the MGCF and the VCC AS. 1.
  • the MSC sends an FWI message carrying the remote off-hook information to the UE to obtain the off-hook information of the UE.
  • AWI refers to the Alert With Information message
  • FWI refers to the Flash With Information message
  • f - dsch refers to the forward dedicated signaling channel (from the network to the UE)
  • f _ csch refers to the forward common signaling channel (from the network to the UE).
  • the UE when the UE performs the VCC handover decision, it is determined whether the off-hook information is received (that is, whether it is in a call state), and the handover is not allowed when the UE does not receive the handover.
  • the embodiment sends the off-hook information to the UE through the VCC AS. :
  • the IMS network side sends off-hook information to the UE, for example, sending a MESSAGE/NOTIFY message to the UE through the IP access network, or notifying the UE by sending an SMS.
  • the VCC AS sends an SMDPP message to an SMSC (Short Message Service Center).
  • SMSC Short Message Service Center
  • the SMSC sends an SMSREQ message to a Home Location Register (HLR).
  • HLR Home Location Register
  • the SMSC sends an SMDPP message including a source address to the MSC/VLR.
  • the MSC/VLR sends an ADDS Deliver message to the BSC.
  • the BSC sends an SMS message to the UE.
  • the UE sends an ACK determination message to the BSC.
  • the BSC sends an ADDS Deliver ACK acknowledgement message to the MSC/VLR.
  • the MSC/VLR sends an SMDPP ACK acknowledgement message to the SMSC.
  • the SMSC sends an SMDPP ACK confirmation message to the VCC AS.
  • the SMS text includes information such as the current state of the call state and the calling/called number.
  • the UE may initiate a VCC handover without waiting for the off-hook information. If the IMS network detects that the current call is in the ringback tone state, it returns a reject response message to the UE to reject the handover request:
  • Embodiment 6 The VCC AS checks that the call is in a ringback tone state, rejects the handover request, and includes a Try- After header, indicating that the UE determines the time (for example, after 10 seconds).
  • Embodiment 7 The VCC AS checks that the call is in a ringback tone state, rejects the handover request, does not include a Try- After header, and the UE decides to try again after a certain time interval (for example, after 15 seconds).
  • Embodiment 8 The VCC AS checks the call as a ringback tone state, rejects the handover request, does not include Try
  • the MESSAGE message is sent at the same time, and the message body gives the far-end off-hook information.
  • the VCC AS receives the remote user off-hook event, it sends a MESSAGE message to the UE, and the message body gives the remote off-hook information.
  • Embodiment 9 The VCC AS checks the call as a ringback tone state, rejects the handover request, does not include Try
  • the reason for the rejection is that the ringback tone state is forbidden to switch.
  • the UE After receiving the rejection reason, the UE sends a SUBSCRIBE message to the VCC AS to subscribe the remote user to the off-hook event, and waits for the VCC AS to send an off-hook event notification.
  • Embodiment 10 The reason for the rejection is that the ringback tone state is prohibited from being switched, and the UE implicitly subscribes to the VCC AS for the remote user off-hook event (that is, the SUBSCRIBE message does not need to be sent), and the UE waits for the off-hook event notification of the VCC AS.
  • Embodiment 11 Determining the reason for the rejection is that the ringback tone state prohibits the handover, and the UE waits for the off-hook event notification of the VCC AS.
  • the VCC AS receives the off-hook event of the remote user, the VCC AS sends a MESSAGE message to the UE, and the message body is given to the remote end. Off-hook information.
  • the advantage of the above three embodiments is that the UE can know the exact cause of the error, and does not need to repeatedly try to send the handover request, which reduces the signaling consumption.
  • the ACC AS may also not directly reject the handover request initiated by the UE:
  • Embodiment 12 The UE initiates a VCC handover normally.
  • the IMS network detects that the current call is in a ringback tone state, it returns 182 (the request is waiting to be processed) or 183 (the request is being processed), waiting for the remote to go off-hook, and then Perform the VCC switching process.
  • the call initiated by the UE through the CDMA network is in the call hold state switching control:
  • Embodiment 13 When performing a local hold operation, the local UE can acquire a local call state, so when the UE performs a VCC handover decision, it should determine whether the current call is in a call hold state. CS to IMS switching is performed to prevent call hold.
  • Embodiment 14 When the remote end performs the hold operation, for the GSM and the UMTS network, the UE knows that the current state of the call is the hold, because after the remote end performs the hold operation, the MSC connected by the local UE sends a Facility message to notify ;
  • the MSC When the remote end performs the hold operation, for the CDMA network, the MSC does not send a message to notify, and then the IMS network detects. Therefore, if the UE initiates a VCC handover request, the IMS network rejects or modifies the CDMA network MSC. , by which the call is held and the call recovery information is maintained.
  • the processing mode in this case is similar to the switching mode of the ringing tone state when the UE initiates a call through the CDMA network, that is, similar to Embodiment 4 to Embodiment 12, except that the call holding information is sent to indicate that the call is Hold, send call recovery message indicates that the call has been restored.
  • the system of the embodiment of the present invention includes: a user equipment 701 and a voice call continuity server 706; the user equipment 701 is configured to send a handover request to the voice call continuity server 706.
  • the voice call continuity server 706 determines whether the call is in a call state after receiving the handover request, and if so, allows handover, and if not, performs exception processing.
  • the system further includes: a mobile switching center 703, configured to send the off-hook information to the user equipment 701.
  • the system of the present invention is described as an example of a device that sends an off-hook information to a UE by using an SMS message.
  • the system of the present invention includes: a user equipment 701, a base station controller 702, and a mobile switching.
  • the machine sends an SMS message including the off-hook information to the short message center 705, through the home location register 704, the mobile switching center 703 and the base station controller 702, the message is sent to the user equipment 701, and the user equipment 701 receives the off-hook. Start switching after the message.
  • the off-hook information and call hold information may be sent to the user equipment 701 by the mobile exchange information 703 or may be sent to the user equipment 701 by the voice call continuity server 706.
  • the system of the embodiment of the present invention includes: a user equipment 701, in a mobile exchange The heart 703, the media gateway control unit 707, the inquiry call session control unit 708, the service call session control unit 709, and the voice call continuity server 706.
  • the user equipment 701 provided by the embodiment of the present invention includes: an information collection unit and a handover decision unit; the information collection unit is configured to collect handover information, and send the handover information to a handover decision unit; The unit determines whether the call is in a call state according to the received handover information, and if the call state is in the call state, initiates a handover request, and if not in the call state, continues to make a call under the current network.

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Description

呼叫切换控制方法及通讯***以及一种用户设备 本申请要求于 2006 年 9 月 5 日提交中国专利局、 申请号为 200610127153.8、 发明名称为"呼叫切换控制方法及通讯***以及一种用户设 备"的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及移动通信领域，尤其涉及呼叫切换控制方法及通讯***以及一 种用户设备。
背景技术
语音呼叫连续性（ VCC , Voice Call Continuity )可使得用户在各种接入技 术之间移动时， 其通话保持连续性， 举例来说， 用户从传统 2G网络（如全球 移动通信*** ( GSM, Global System for Mobile communications )、 码分多址接 入***（CDMA, Code Division Multiple Access ) )移动到 3G网络（通用移动 通信*** ( UMTS, Universal Mobile Telecommunications System )、 高速分组数 据***（ HRPD , High Rate Packet Data ) ) 时， 其通话继续， 又可以发起其它 3G业务， 如高速上网。
VCC技术基于互联网协议多媒体子***（ IMS , Internet protocol Multimedia Subsystem ), IMS是位于 IP接入网络（ UMTS的 PS域部分、 HRPD网络或无 线局域网 （ WLAN, Wireless Local Area Network ) )之上的网络， IMS提供基 本业务功能， 运营商可以在此基础上开发各种业务。 为了支持 VCC, —个用 户通过电路交换（CS, Circuit Switched )网络（即 2G网络）发起 /接收呼叫时， 呼叫信令都要进入 IMS网络， 其中一个网元 VCC AS ( VCC应用服务器） 能 控制 VCC切换。 IMS进入 CS网络的网元是媒体网关控制单元（MGCF, Media Gate - Way Control Function ), MGCF也控制 MGW进行承载的路由。
现有 VCC技术中一个 CS到 IMS (这里釆用 WLAN接入技术）的切换流 程如图 1所示：
进行 CS语音业务的 UE进入 WLAN覆盖时， 可能由于 CS网络无线环境 变差或 IMS优先而发起到 WLAN的语音切换。
具体流程如下： 101、 如果用户设备 ( UE, User Equipment ) 没有进行 IMS注册， 则执行 注册。
102、 UE发起到 WLAN的语音切换， 发出一个到 VCC AS关联的地址标 识的 IMS呼叫， UE发送邀请 ( INVITE )消息到代理呼叫会话控制单元（ P - CSCF , Proxy Call Session Control Function ) , 然后到达服务呼叫会话控制单元 ( S - CSCF, Serving Call Session Control Function )。
103、 S - CSCF基于初始过滤策略（initial Filter Criteria ), 将 INVITE消 息前转到 VCC AS, VCC AS关联的地址标识和 P - Asserted - Identity (私密性 声明标识）头（包含 UE的 CS域移动台号码（ MDN, Mobile Directory Number ) ) 组合起来标志哪个用户设备发起 VCC切换。
104、 VCC AS通过 S - CSCF发送重邀请 ( re - INVITE )消息到远端（ Other End Point, 呼叫的另一方， 包括网络和用户设备 ), 该 re - INVITE消息中包含 UE新的 WLAN呼叫会话描述协议（ SDP, Service Description Protocol )信息。
105、 远端响应 200 OK, 最终到达 UE。
106、 UE发出 ACK, 最终到达远端， UE和 VCC AS之间的会话发起协议
( SIP, Session Initial Protocol )呼叫对话 ( call dialogue ) 3建立。
107、收到 ACK后， VCC AS通过 S - CSCF发送结束（ BYE )消息到 MGCF, 以清除 CS语音呼叫 （SIP呼叫对话 2 )。
108 ~ 112、 移动交换中心（ MSC, Mobile Switching Center )和 UE之间的 CS语音呼叫被释放， MGCF返回 200 OK到 VCC AS。
但是，目前的 VCC切换假设在通话状态下进行，没有考虑振铃 /回铃音（被 叫 /主叫情形） /保持等非通话状态的因素， 例如， UE被叫振铃期间发生切换， 则 UE会发起主叫流程， 真实的用户摘机信号无法传递； UE主叫发生切换时， 则 UE也会发起主叫流程， 此时回铃音（例如彩铃）的产生可能出现混乱； 呼 叫保持状态进行切换则太过于复杂。
发明内容
本发明实施例在于提供呼叫切换控制方法及通讯***以及一种用户设备， 用于防止用户设备在振铃 /回铃音 /保持等非通话状态进行切换。
本发明实施例提供的基于网络侧的呼叫切换控制方法， 包括： 接收来自用 户设备的切换请求，判断呼叫是否处于通话状态，若是，则允许切换，若不是, 则执行异常处理。
本发明实施例提供的基于用户侧的呼叫切换控制方法， 包括： 用户设备判 断呼叫是否处于通话状态， 若是， 则发起切换请求， 若不是， 则继续在当前网 络下进行呼叫； 互联网协议多媒体子***网络若接收到所述切换请求， 则对所 述用户设备进行切换。
本发明实施例提供的通讯***， 包括： 用户设备， 用于向语音呼叫连续性 服务器发送切换请求； 语音呼叫连续***器， 用于接收到所述切换请求， 如 果判断出呼叫处于通话状态， 则允许切换， 如果判断出呼叫处于非通话状态， 则执行异常处理。
本发明实施例提供的用户设备， 包括：信息釆集单元，用于釆集切换信息， 并将所述切换信息发送给切换决策单元； 切换决策单元， 用于根据接收到的切 换信息，判断呼叫处于通话状态后，发起切换请求，断呼叫处于非通话状态时， 继续在当前网络下进行呼叫。
以上技术方案可以看出， 本发明实施例具有以下优点：
首先， 本发明实施例中， 在用户请求切换时， 先要判断呼叫是否处于通话 状态， 若不是通话状态则拒绝切换， 所以本发明实施例可以有效地避免用户在 振铃 /回铃音 /保持等 ^通话状态进行切换；
其次，本发明实施例方法既可以用于 GSM网络，也可以用于 UMTS网络， 还可以用于 CDMA网络， 所以提高了本发明方法的适应性；
最后， 本发明实施例方法对 CDMA网络中的回铃音以及呼叫保持状态的 判断提出了多种判断方式， 所以提高了本发明方法的灵活性。
附图说明
图 1为现有技术中切换方法流程图；
图 2为本发明实施例的呼叫切换控制方法总体流程图；
图 3为 GSM/UMTS网络 UE主叫流程图；
图 4为现有技术 CDMA网络中 UE主叫流程图；
图 5为本发明实施例中 MSC下发摘机信息的呼叫流程图；
图 6为本发明实施例中 VCC AS下发摘机信息的呼叫流程图； 图 7 ( a ) ~ ( b )为本发明实施例***示意图。
具体实施方式
本发明实施例提供了呼叫切换控制方法及通讯***以及一种用户设备，用 于防止用户在振铃 /回铃音 /保持等非通话状态进行切换。
请参阅图 2, 本发明实施例基于网络侧的呼叫切换控制方法流程如下：
201、 用户设备发起切换请求；
其中， 当用户移动到不同网络覆盖范围时， 用户设备会检测到网络状况的 变化， 从而发起切换请求； 或者用户主动要求进行切换， 通过用户设备发起切 换请求。
202、 判断呼叫是否处于通话状态， 若是， 则转向步骤 203 , 若否， 则转 向步骤 204;
203、 进行切换；
204、 进行异常处理。
其中， 异常处理可以是拒绝切换， 也可以是将切换请求保存并向用户设备 反馈等待消息， 等到呼叫处于通话状态之后再处理切换请求。
由上述方案可以看出，本发明实施例在进行切换之前需要先判断当前呼叫 是否处于通话状态， 若不是处于通话状态则拒绝切换请求，从而有效地防止用 户在振铃 /回铃音 /保持等非通话状态进行切换。
此外， 本发明实施例还提供了一种基于用户侧的呼叫切换控制方法， 该方 法将切换的判断权归于用户侧， 即用户设备， 也就是说， 用户设备对呼叫的状 态进行检测， 只有当呼叫处于通话状态时才发起切换请求， 当互联网协议多媒 体子***网络接收到用户设备发起的请求之后不再进行判断而是直接进行切 换。
下面结合具体实施例对本发明进行详细描述：
实施例一、 IMS到 CS的呼叫切换控制：
高速 IP接入网络一般热点覆盖， 当 UE离开热点区域后， 应保持呼叫连 续性， 平滑切换到 CS网络。
在这种情况下， UE在 IMS发起或接受呼叫时， 釆用 SIP协议进行信令交 互， 通过信令消息能够获取呼叫的当前状态， 如振铃， 回铃音， 保持， 或是通 话状态， 所以在 UE可以直接对当前状态进行判断。
实施例二、 CS到 IMS情况下的振铃状态的呼叫切换控制：
被叫振铃期间（本地用户还没有接受该呼叫 ) , UE知晓呼叫的状态， 所以 在 UE进行 VCC切换决策时， 应判断本地用户是否接受了该呼叫， 以防止振 铃期间进行 CS到 IMS切换。
其中， CS切换到 IMS是指： UE进入热点区域后，将语音业务切换到 IMS 的 IP接入网络， 同时可以发起高速数据业务， 而且 IP电话（VoIP )的资费比
CS网络的语音业务低廉。
实施例三、 CS到 IMS情况下 UE通过 GSM/UMTS网络发起呼叫时回铃 音状态的呼叫切换控制：
如图 3所示， 对于 UE通过 GSM/UMTS网络发起的呼叫， 因为远端被叫 用户摘机时， 主叫 UE连接的 MSC会向主叫用户下发指示被叫用户摘机的连 接（Connect ) 消息， 所以主叫 UE可以根据该消息判断当前状态为通话状态。
关键流程如下：
301、 被叫 UE 向与其连接的 MSC或者拜访位置寄存器（ VLR, Visitor
Location Register )发送振铃信息；
302、被叫 UE连接的 MSC/VLR向主叫 UE连接的 MSC/VLR发送地址完 整消息 （ ACM消息 ) , 以通知被叫正在振铃；
303、主叫 UE连接的 MSC/VLR提醒主叫 UE当前的呼叫状态为回铃音状 态；
304、 当被叫用户摘机时， 被叫 UE向与其连接的 MSC/VLR发送 Connect 消息；
305、 被叫方的 MSC/VLR 向主叫 UE 连接的 MSC/VLR发送应答消息 ( ANM消息）， 以通知被叫方已经摘机；
306、主叫 UE连接的 MSC/VLR提醒主叫 UE当前的呼叫状态为通话状态。
CS到 IMS情况下， 当 UE通过 CDMA网络发起呼叫时， 实现回铃音状态 的呼叫切换控制的方式具体有 9种： 参见下面的实施例四 ~实施例十二。
实施例四、 在 UE进行 VCC切换决策时， 判断是否收到了摘机信息 （即 是否处于通话状态）， 没有收到就不允许进行切换， 该实施例通过 MSC向 UE 下发摘机信息实现：
请参阅图 4,现有技术 CDMA网络中，远端摘机后，主叫 UE连接的 MSC 不会下发摘机信息，所以 UE不能区分回铃音和通话状态，现有技术流程如下：
401、 被叫 UE提示 MSC/VLR分配完成；
402、被叫方 MSC/VLR向主叫 UE连接的 MSC/VLR发送 ACM消息告知 当前状态为被叫正在振铃， 也即主叫接收回铃音；
403、 当被叫 UE摘机时， 被叫 UE向 MSC/VLR发送 Connect消息提示被 叫方已摘机；
404、被叫方的 MSC/VLR向主叫 UE连接的 MSC/VLR发送 ANM消息已 告知当前状态为通话状态。
为了使主叫 UE接收到摘机信息， 所以需要对现有流程进行修改， 本实施 例中由 MSC下发摘机信息： MSC在收到被叫方摘机消息 （ ANM/CON )后， 通知 UE , 如扩展现有的 Flash with information 消息， 增力。对一个新的 Information Record的支持。
请参阅图 5, 具体流程如下：
501、 UE发出始呼消息。
502、 MSC调用一个始呼 WIN trigger以获得路由信息。 VCC AS的 CS侧 作为一个 SCP接收 MAP ORREQ (主叫请求 MAP消息）；
503、 VCC AS为后续的呼叫建立保存 MDN和 CdPN (被叫电话号码）， 并返回 VCC AS的 IMS路由号码；
504、 MSC/VLR发送 ISUP IAM消息给 UE拜访网络的 MGCF , 包含 UE 的路由信息 （即 CdPN字段的 IMS路由号码和 CgPN字段的 UE MDN )和一 个 PCM/TDM trunk (将用来连接 MSC和 MGW );
505、 MGCF请求 MGW连接 PCM/TDM trunk,并分配一个 ephemeral (短 暂） termination以连接 OEP ( Other End Point, 对等端）。 MGCF发送 INVITE 给 I - CSCF, 在 Request URI头中有 VCC AS关联的地址标识 （一个 E.164号 码），在 P - Asserted - ID头中有 UE的 MDN。 I - CSCF将 INVITE发送给 VCC AS;
506、 VCC AS发送 INVITE消息给 I - CSCF,包含 UE的路由信息。 Request URI头现在包含 UE的 MDN, P - Asserted - ID包含步骤 502中保存的 CdPN;
507、 I - CSCF查询 HSS以获得在注册时分配给 UE的 S - CSCF地址， 并发送 INVITE给该 S - CSCF。 基于过滤策略， S - CSCF发送 SIP INVITE 消息给 VCC AS, 包含 UE的路由信息；
508、 VCC AS作为一个背靠背用户代理（B2BUA )并创建一个新的呼叫 对话 2, 返回 INVITE给 S - CSCF;
509、 一旦完成过滤策略处理， S - CSCF发送 INVITE给 OEP。
510、 OEP响应 SIP 180 Ringing消息，最后到达 MGCF, 包含 OEP 的 SDP 信息；
511、 MGCF根据 OEP SDP修改 MGW ephemeral termination并发送 ISUP
ACM消息给 MSC/VLR;
512、 MSC/VLR发送信道分配消息给 UE;
513、 UE捕获 lx业务信道；
514、 OEP应答呼叫并返回 SIP 200 OK消息给 MGCF;
515、 MGCG发送 ISUP ANM消息给 MSC/VLR;
516、 MSC下发 Flash With Information消息到 UE, 携带远端摘机信息；
517、 MGCF发送 SIP ACK消息给 OEP, 这将完成 MGCF和 VCC AS之 间呼叫对话 1、 VCC AS和 OEP之间的呼叫对话 2的建立。
从上述流程中可以看出， MSC向 UE下发携带远端摘机信息的 FWI消息 来实现 UE获取摘机信息。
在上述的流程中需要定义一个新的信息记录类型， 如下表所示：
表 1
Figure imgf000009_0001
其中， AWI指 Alert With Information消息； FWI指 Flash With Information 消息。 f - dsch指前向专用信令信道（由网络到 UE ); f _ csch指前向公共信令信 道 (由网络到 UE )。
Flash With Information消息格式如下表所示：
表 2
Figure imgf000010_0001
实施例五、 在 UE进行 VCC切换决策时， 判断是否收到了摘机信息 （即 是否处于通话状态）， 没有收到就不允许进行切换， 该实施例通过 VCC AS向 UE下发摘机信息实现：
IMS 网络侧发送摘机信息到 UE , 如通过 IP 接入网络发送 MESSAGE/NOTIFY消息通知 UE, 或通过发送 SMS通知 UE。
请参阅图 6, 具体流程如下：
601、 VCC AS向短消息中心（ SMSC, Short Message Service Center )发送 SMDPP消息；
602、 SMSC 向归属位置寄存器 （HLR, Home Location Register )发送 SMSREQ消息；
603、 SMSC向 MSC/VLR发送包含源地址的 SMDPP消息；
604、 MSC/VLR向 BSC发送 ADDS Deliver消息；
605、 BSC向 UE发送 SMS消息；
606、 UE向 BSC发送 ACK确定消息；
607、 BSC向 MSC/VLR发送 ADDS Deliver ACK确认消息；
608、 MSC/VLR向 SMSC发送 SMDPP ACK确认消息；
609、 SMSC向 VCC AS发送 SMDPP ACK确认消息。
其中， SMS正文中包含当前状态为通话状态以及主 /被叫号码等信息。 另外， UE可以不必等待摘机信息而正常发起 VCC切换， 若 IMS网络检 测到目前的呼叫为回铃音状态，则返回拒绝响应消息到 UE, 以拒绝切换请求： 实施例六、 VCC AS检查呼叫为回铃音状态， 拒绝切换请求， 包含 Try - After头， 指示 UE—定时间 （如 10秒后）后再尝试。
实施例七、 VCC AS检查呼叫为回铃音状态， 拒绝切换请求， 不包含 Try - After头， UE自主决定间隔一定时间 （如 15秒后）后再尝试。
实施例八、 VCC AS检查呼叫为回铃音状态， 拒绝切换请求， 不包含 Try
- After头， 同时发送 MESSAGE消息， 消息正文给出远端尚未摘机信息， 一 旦 VCC AS接收到远端用户摘机事件时， 向 UE发送 MESSAGE消息， 消息正 文给出远端摘机信息。
以上三个实施例的优点在于简单易行， 便于实现。
实施例九、 VCC AS检查呼叫为回铃音状态， 拒绝切换请求， 不包含 Try
- After 头， 定义拒绝原因为回铃音状态禁止切换， UE 收到拒绝原因后， 向 VCC AS发送 SUBSCRIBE消息， 进行远端用户摘机事件订阅， 等待 VCC AS 发送摘机事件通知。
实施例十、 定义拒绝原因为回铃音状态禁止切换， UE隐含的向 VCC AS 进行远端用户摘机事件订阅（即不需要发送 SUBSCRIBE消息）， UE等待 VCC AS的摘机事件通知。
实施例十一、 定义拒绝原因为回铃音状态禁止切换， UE等待 VCC AS的 摘机事件通知， VCC AS接收到远端用户摘机事件时， 向 UE发送 MESSAGE 消息， 消息正文给出远端摘机信息。
以上三个实施例的优点在于 UE能获知准确的错误原因， 不需要反复尝试 发送切换请求， 减少了信令消耗。
ACC AS也可以不直接拒绝 UE发起的切换请求：
实施例十二、 UE正常发起 VCC切换， IMS网络检测到目前的呼叫为回 铃音状态， 则返回 182 (请求正在等待被处理）或 183 (请求正在被处理）等 待远端摘机后， 再进行 VCC切换流程。
CS到 IMS情况下， UE通过 CDMA网络发起的呼叫处于呼叫保持状态的 切换控制：
实施例十三、 当进行本地保持操作时， 本地 UE能够获取本地呼叫状态， 所以在 UE进行 VCC切换决策时， 应判断当前呼叫是否处于呼叫保持状态， 以防止呼叫保持状态进行 CS到 IMS切换。
实施例十四、 当远端进行保持操作时， 对于 GSM和 UMTS 网络来说， UE知晓呼叫的当前状态是保持， 因为远端进行保持操作后， 本地 UE连接的 MSC会下发 Facility消息来通知；
当远端进行保持操作时， 对于 CDMA网络， MSC不会下发消息来通知， 则由 IMS网络进行检测， 因此该状态 UE若发起 VCC切换请求， IMS网络会 拒绝，或者对 CDMA网络 MSC进行修改， 由其下发呼叫被保持信息和呼叫恢 复信息。
这种情况下的处理方式与 UE通过 CDMA网络发起呼叫时回铃音状态的 切换控制时切换方式类似， 即与实施例四至实施例十二类似， 区别在于， 此时 发送呼叫保持信息说明呼叫被保持， 发送呼叫恢复信息说明呼叫已恢复。
请参阅图 7 ( a ) 以及图 7 ( b ), 本发明实施例的***包括： 用户设备 701 以及语音呼叫连续***器 706; 所述用户设备 701用于向语音呼叫连续性服 务器 706发送切换请求；所述语音呼叫连续***器 706接收到所述切换请求 之后判断呼叫是否处于通话状态， 若是， 则允许切换， 若不是， 则执行异常处 理。
其中， 所述***还包括： 移动交换中心 703 , 用于向用户设备 701发送摘 机信息。
下面以 VCC AS通过 SMS消息向 UE下发摘机信息的装置为例说明本发 明***： 请参阅图 7 ( a ), 本发明实施例的***包括： 用户设备 701 , 基站控 制器 702, 移动交换中心 703 , 归属位置寄存器 704, 短消息中心 705以及语 音呼叫连续***器 706; 用户设备 701向语音呼叫连续***器 706发起切 换请求，语音呼叫连续***器 706检测当前呼叫的状态， 当远端摘机之后向 短消息中心 705下发包含摘机信息的 SMS消息， 通过归属位置寄存器 704, 移动交换中心 703以及基站控制器 702, 该消息被发送给用户设备 701 , 当用 户设备 701收到摘机消息后开始切换。
摘机信息和呼叫保持信息可以由移动交换信息 703发送给用户设备 701 , 也可以由语音呼叫连续***器 706发送给用户设备 701。
如图 7 ( b )所示， 本发明实施例的***包括： 用户设备 701 , 移动交换中 心 703 , 媒体网关控制单元 707 , 查询呼叫会话控制单元 708, 服务呼叫会话 控制单元 709以及语音呼叫连续性 Λ良务器 706。
本发明实施例的提供的用户设备 701包括：信息釆集单元以及切换决策单 元； 所述信息釆集单元用于釆集切换信息， 并将所述切换信息发送给切换决策 单元； 所述切换决策单元根据接收到的切换信息判断呼叫是否处于通话状态， 若处于通话状态， 则发起切换请求， 若未处于通话状态， 则继续在当前网络下 进行呼叫。
需要说明的是，本领域普通技术人员可以理解实现上述实施例方法中的全 部或部分步骤是可以通过程序来指令相关的硬件来完成，所述的程序可以存储 于一计算机可读取存储介质中， 该程序在执行时， 包括上述方法的步骤； 所述 的存储介质， 如： ROM/RAM、 磁碟、 光盘等。
以上对本发明所提供的呼叫切换控制方法及通讯***以及一种用户设备 述， 以上实施例的说明只是用于帮助理解本发明的方法及其核心思想； 同时， 对于本领域的一般技术人员，依据本发明的思想， 在具体实施方式及应用范围 上均会有改变之处， 综上所述， 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种基于网络侧的呼叫切换控制方法， 其特征在于， 包括： 接收来自用户设备的切换请求， 判断呼叫是否处于通话状态， 若是， 则允 许切换， 若不是， 则执行异常处理。
2、 根据权利要求 1所述的呼叫切换控制方法， 其特征在于， 所述判断呼 叫是否处于通话状态的步骤包括：
语音呼叫连续***器对当前呼叫的状态进行检测 ,根据检测结果判断呼 叫是否处于通话状态；
所述检测结果包括回铃音状态、 呼叫保持状态、 或通话状态。
3、 根据权利要求 2所述的呼叫切换控制方法， 其特征在于， 若呼叫未处 于通话状态而处于回铃音状态或呼叫保持状态， 则所述异常处理包括： 语音呼 叫连续***器发送拒绝切换请求的响应信息。
4、 根据权利要求 3所述的呼叫切换控制方法， 其特征在于， 在语音呼叫 连续***器拒绝切换请求之后， 所述异常处理进一步包括： 通知用户设备在 预置时间之后再次请求切换。
5、 根据权利要求 3所述的呼叫切换控制方法， 其特征在于， 若当前呼叫 未处于通话状态而处于回铃音状态，则语音呼叫连续***器发送拒绝切换请 求的响应信息之后， 进一步包括：
语音呼叫连续***器向用户设备发送摘机信息；
接收来自用户设备的切换请求， 根据所述切换请求进行切换。
6、 根据权利要求 5所述的呼叫切换控制方法， 其特征在于， 所述拒绝切 换请求的响应信息中包含拒绝原因， 所述拒绝原因为回铃音状态。
7、 根据权利要求 5或 6所述的呼叫切换控制方法， 其特征在于， 在语音 呼叫连续***器向用户设备发送摘机信息之前进一步包括：
用户设备向语音呼叫连续***器发送摘机事件订阅消息。
8、 根据权利要求 3所述的呼叫切换控制方法， 其特征在于， 若当前呼叫 未处于通话状态而处于呼叫保持状态，则语音呼叫连续***器发送拒绝切换 请求的响应信息之后， 进一步包括：
语音呼叫连续***器向用户设备发送呼叫恢复信息； 接收来自用户设备的切换请求， 根据所述切换请求进行切换。
9、 根据权利要求 8所述的呼叫切换控制方法， 其特征在于，
所述拒绝切换请求的响应信息中包含拒绝原因，所述拒绝原因为回铃音状 态。
10、 根据权利要求 8或 9所述的呼叫切换控制方法， 其特征在于， 在语音 呼叫连续***器向用户设备发送呼叫恢复信息之前进一步包括：
用户设备向语音呼叫连续***器发送呼叫恢复事件订阅消息。
11、 根据权利要求 2所述的呼叫切换控制方法， 其特征在于， 若当前呼叫 未处于通话状态而处于回铃音状态， 则所述异常处理为：
语音呼叫连续***器向用户设备返回请求正在处理或请求正在等待处 理并保存用户设备发起的切换请求；
当收到摘机信息之后，语音呼叫连续***器根据保存的切换请求进行切 换。
12、 根据权利要求 2所述的呼叫切换控制方法， 其特征在于， 若当前呼叫 未处于通话状态而处于呼叫保持状态， 则所述异常处理为：
语音呼叫连续***器向用户设备返回请求正在处理或请求正在等待处 理并保存用户设备发起的切换请求；
当收到呼叫恢复信息之后语音呼叫连续***器根据保存的切换请求进 行切换。
13、 一种基于用户侧的呼叫切换控制方法， 其特征在于， 包括： 用户设备判断呼叫是否处于通话状态， 若是， 则发起切换请求， 若不是， 则继续在当前网络下进行呼叫；
互联网协议多媒体子***网络若接收到所述切换请求，则对所述用户设备 进行切换。
14、 根据权利要求 13所述的呼叫切换控制方法， 其特征在于， 所述用户 设备判断呼叫是否处于通话状态的步骤包括：
利用会话发起协议消息获取当前呼叫的状态，根据所述呼叫状态判断呼叫 是否处于通话状态；
所述呼叫状态包括振铃状态、 回铃音状态、 呼叫保持状态或通话状态。
15、 根据权利要求 13所述的呼叫切换控制方法， 其特征在于， 所述用户 设备判断呼叫是否处于通话状态的步骤包括：
若用户设备接收到摘机信息， 或用户设备发送摘机信息， 则判断呼叫处于 通话状态。
16、 根据权利要求 15所述的呼叫切换控制方法， 其特征在于， 在用户设 备接收到摘机信息， 或者用户设备发送摘机信息之后进一步包括：
若用户设备发送呼叫保持信息， 或用户设备接收到呼叫保持信息， 则判断 呼叫未处于通话状态。
17、 根据权利要求 15所述的呼叫切换控制方法， 其特征在于， 所述用户 设备接收到的摘机信息来自移动交换中心， 或者互联网协议多媒体子***网 络。
18、 根据权利要求 16所述的呼叫切换控制方法， 其特征在于， 所述用户 设备接收到的呼叫保持信息来自移动交换中心，或者互联网协议多媒体子*** 网络。
19、 一种通讯***， 其特征在于， 包括：
用户设备， 用于向语音呼叫连续***器发送切换请求；
语音呼叫连续***器， 用于接收到所述切换请求， 如果判断出呼叫处于 通话状态， 则允许切换， 如果判断出呼叫处于非通话状态， 则执行异常处理。
20、 根据权利要求 19所述的通讯***， 其特征在于， 所述***还包括： 移动交换中心， 用于向用户设备发送摘机信息或呼叫保持信息。
21、 根据权利要求 19所述的通讯***， 其特征在于， 所述语音呼叫连续 ***器用于向用户设备发送摘机信息或呼叫保持信息。
22、 一种用户设备， 其特征在于， 包括：
信息釆集单元， 用于釆集切换信息， 并将所述切换信息发送给切换决策单 元；
切换决策单元， 用于根据接收到的切换信息， 判断呼叫处于通话状态后， 发起切换请求， 判断呼叫处于非通话状态时， 继续在当前网络下进行呼叫。
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