WO2018141188A1 - 一种单信道连续业务的切换方法和装置 - Google Patents

一种单信道连续业务的切换方法和装置 Download PDF

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Publication number
WO2018141188A1
WO2018141188A1 PCT/CN2017/119591 CN2017119591W WO2018141188A1 WO 2018141188 A1 WO2018141188 A1 WO 2018141188A1 CN 2017119591 W CN2017119591 W CN 2017119591W WO 2018141188 A1 WO2018141188 A1 WO 2018141188A1
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Prior art keywords
handover
srvcc
mscs
message
srvcc handover
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PCT/CN2017/119591
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English (en)
French (fr)
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梁琳琳
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中兴通讯股份有限公司
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    • 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
    • H04W8/08—Mobility data transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

Definitions

  • the present application relates to the field of wireless communication technologies, such as a method and apparatus for switching single channel continuous services.
  • VoLTE Voice over LTE
  • the current mainstream LTE voice solution is to deploy an IMS network and a corresponding application server to provide VoLTE.
  • the voice call may be interrupted due to incomplete network coverage.
  • the Single Radio Voice Call Continuity (SRVCC) technology can be used in the fourth generation mobile communication technology.
  • the 4G voice call is switched to the 2G or 3G network to solve the network deployment problem in the early 4G.
  • SRVCC is a solution for providing single-channel voice continuity using an IMS-accessible IMS voice service network.
  • the SRVCC is moved from LTE to Client/Server (User/Server, referred to as UE).
  • CS Client/Server
  • the CS branch is established, and a network element in the IMS is anchored, and the CS call is connected with the original IMS call through the anchored network element, thereby forming a complete call chain and maintaining the original IMS domain.
  • the call can continue after the switch.
  • MME Mobile Management Entity, MME the mobile switching center (Mobile Switching Center, MSC Server) is carried according to the message.
  • the switching number is initiated to the IMS Session Initiation Protocol (SIP) establishment request process, and the update media message (18X), handover detection (Handover Detection, referred to as: HO) completion message and INFO are received.
  • SIP Session Initiation Protocol
  • HO handover detection
  • the embodiments of the present disclosure provide a method and a device for switching a single-channel continuous service, so as to solve the problem of performing the SRVCC handover in the related art, which may be caused by the untimely and compatibility of the processing information of the network element in the IMS.
  • the issue of SRVCC switching success rate is lower.
  • the embodiment of the present disclosure provides a method for switching a single channel continuous service, including: the mobile interaction center server MSCS sends a session initiation protocol SIP to the information management system IMS according to the handover number obtained from the mobility management entity MME. And the MSCS sends a single channel continuous service SRVCC handover complete notification message to the MME after receiving the update media message sent by the IMS and the handover detection complete message sent by the target base station.
  • the method before the sending, by the MSCS, the SIP setup request message to the IMS, the method includes: the MSCS receiving an SRVCC handover request message sent by the MME, the SRVCC handover request The message includes the handover number and the identifier information of the target base station; the MSCS sends a handover detection request message to the target base station according to the identifier information of the target base station; and the MSCS receives the handover detection sent by the target base station.
  • the handover detection response message is used to indicate that the target base station has the capability of allocating radio resources.
  • the method further includes: the MSCS calculating an SRVCC handover success rate according to the number of times the SRVCC handover completion notification message is sent and the number of times the SRVCC handover request message is received.
  • the MSCS is configured with a timer, and after the MSCS sends a SIP setup request message to the IMS, the method further includes: the MSCS turning on the timer; After the MSCS sends an SRVCC handover complete notification message to the MME, the method further includes: when the timer does not receive the INFO message sent by the IMS, the SS sends a cancel SRVCC handover notification message to the MME. .
  • the method further includes: the number of times the MSCS sends an SRVCC handover completion notification message, the number of times the SRVCC handover request message is received, and the number of times the SRVCC handover notification message is sent is cancelled. Calculate the SRVCC handover success rate.
  • an embodiment of the present disclosure provides a method for switching a single channel continuous service, including: a mobility management entity MME sending a single channel continuous service SRVCC handover request message to a mobile interaction center server MSCS; the MME receiving the MSCS sending The SRVCC handover completion notification message is sent to the MME after the MSCS receives the update media message sent by the information management system IMS and the handover detection complete message sent by the target base station.
  • the SRVCC handover request message includes the identifier information of the target base station, where the SRVCC handover request message is used to indicate that the MSCS is based on the identifier information of the target base station.
  • the target base station sends a handover detection request message, and receives a handover detection response message sent by the target base station, where the handover detection response message is used to indicate that the target base station has the capability of allocating radio resources.
  • the SRVCC handover request message includes a handover number, where the SRVCC handover request message is used to indicate that the MSCS sends a session initiation protocol to the IMS according to the handover number.
  • SIP setup request message includes a handover number, where the SRVCC handover request message is used to indicate that the MSCS sends a session initiation protocol to the IMS according to the handover number.
  • the method further includes:
  • the MME calculates the SRVCC handover success rate according to the number of times the SRVCC handover completion notification message is received and the number of times the SRVCC handover request message is sent.
  • the method further includes: receiving, by the MME, a cancel SRVCC handover notification message sent by the MSCS; and sending, by the MME, the number of times the SRVCC handover completion notification message is received, and sending the SRVCC The number of times the request message is switched and the number of times the SRVCC handover notification message is cancelled is received, and the SRVCC handover success rate is calculated.
  • an embodiment of the present disclosure provides a switching apparatus for a single channel continuous service, where the apparatus is disposed in a mobile interaction center server MSCS, the apparatus includes: a sending module and a receiving module; and the sending module is configured to be based on mobility
  • the switching number obtained by the management entity MME is sent to the information management system IMS to send a session initiation protocol SIP establishment request message;
  • the receiving module is configured to receive the update media message sent by the IMS and the handover detection complete message sent by the target base station;
  • the receiving module is further configured to: before the sending module sends a SIP setup request message to the IMS, receive an SRVCC handover request message sent by the MME, where the SRVCC switch The request message includes the switching number and the identifier information of the target base station; the sending module is further configured to send a handover detection request message to the target base station according to the identifier information of the target base station received by the receiving module; The receiving module is further configured to receive a handover detection response message sent by the target base station, where the handover detection response message is used to indicate that the target base station has the capability of allocating radio resources.
  • the device further includes: a calculating module, configured, according to the number of times the sending module sends the SRVCC handover complete notification message and the number of times the receiving module receives the SRVCC handover request message , calculate the SRVCC switching success rate.
  • the MSCS is configured with a timer
  • the apparatus further includes: an opening module, configured to: after the sending module sends a SIP establishment request message to the IMS, The sending module is further configured to send a cancel SRVCC handover notification message to the MME when the timer does not receive the INFO message sent by the IMS when the timer reaches a preset time.
  • the device further includes: a calculating module, configured, according to the number of times the sending module sends the SRVCC handover completion notification message, and the number of times the receiving module receives the SRVCC handover request message And the number of times the sending module sends the cancel SRVCC handover notification message, and calculates the SRVCC handover success rate.
  • a calculating module configured, according to the number of times the sending module sends the SRVCC handover completion notification message, and the number of times the receiving module receives the SRVCC handover request message And the number of times the sending module sends the cancel SRVCC handover notification message, and calculates the SRVCC handover success rate.
  • an embodiment of the present disclosure provides a switching apparatus for a single channel continuous service, where the apparatus is disposed in a mobility management entity MME, where the apparatus includes: a sending module configured to send a single channel to a mobile interaction center server MSCS a continuous service SRVCC handover request message, and a receiving module, configured to receive an SRVCC handover completion notification message sent by the MSCS, where the SRVCC handover completion notification message is an update media message and a target base station that are sent by the MSCS to the information management system IMS. After the transmitted handover detection complete message is sent to the MME.
  • the SRVCC handover request message includes the identifier information of the target base station, where the SRVCC handover request message is used to indicate that the MSCS is located according to the identifier information of the target base station.
  • the target base station sends a handover detection request message, and receives a handover detection response message sent by the target base station, where the handover detection response message is used to indicate that the target base station has the capability of allocating radio resources.
  • the SRVCC handover request message includes a handover number, where the SRVCC handover request message is used to indicate that the MSCS sends a session initiation protocol to the IMS according to the handover number.
  • SIP setup request message includes a handover number, where the SRVCC handover request message is used to indicate that the MSCS sends a session initiation protocol to the IMS according to the handover number.
  • the device further includes: a calculating module, configured, according to the number of times the receiving module receives the SRVCC handover completion notification message and the number of times the sending module sends the SRVCC handover request message , calculate the SRVCC switching success rate.
  • the receiving module is further configured to receive a cancel SRVCC handover notification message sent by the MSCS, where the apparatus further includes: a calculation module, configured to be according to the receiving module The number of times the SRVCC handover completion notification message is received, the number of times the transmitting module sends the SRVCC handover request message, and the number of times the receiving module receives the cancellation of the SRVCC handover notification message, and calculates the SRVCC handover success rate.
  • the MSCS sends a SIP setup request message to the IMS according to the handover number obtained from the MME, and then the MSCS receives the update media message sent by the IMS and the target base station sends the message. After the handover detection completion message, the SRVCC handover completion notification message is sent to the MME.
  • the MSCS can send the above-mentioned SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS, so that the IMS does not return the INFO message for a long time, and the MME cannot receive the SRVCC handover completion notification message for a long time, thereby
  • the process of sending an SRVCC handover cancellation message to the MSCS to notify the MSCS to release the call is beneficial to improve the success rate of the SRVCC handover.
  • the embodiment of the present disclosure solves the process of performing the SRVCC handover in the related art, possibly because the network element processing message in the IMS is not timely. For reasons such as compatibility, the calculated index of SRVCC switching success rate is low.
  • FIG. 1 is a schematic diagram of an application scenario of a handover method of an SRVCC
  • FIG. 4 is a flowchart of a method for switching an SRVCC according to an embodiment of the present disclosure
  • FIG. 5 is a flowchart of another method for switching an SRVCC according to an embodiment of the present disclosure
  • FIG. 6 is a flowchart of still another method for switching an SRVCC according to an embodiment of the present disclosure
  • FIG. 7 is a flowchart of still another method for switching an SRVCC according to an embodiment of the present disclosure.
  • FIG. 8 is a flowchart of still another method for switching an SRVCC according to an embodiment of the present disclosure
  • FIG. 9 is a flowchart of still another method for switching an SRVCC according to an embodiment of the present disclosure.
  • FIG. 10 is a flow chart of interaction between the SRVCC and the handover method of the SRVCC according to an embodiment of the present disclosure
  • FIG. 11 is a schematic structural diagram of a SRVCC switching apparatus according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of another SRVCC switching apparatus according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of still another SRVCC switching apparatus according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram of still another SRVCC switching apparatus according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic structural diagram of still another apparatus for switching an SRVCC according to an embodiment of the present disclosure.
  • SRVCC is proposed in the 3rd Generation Partnership Project (3GPP) to solve the problem that voice calls may be interrupted due to incomplete network coverage in the scenario of using VoLTE.
  • 3GPP 3rd Generation Partnership Project
  • SRVCC mainly The problem of how to ensure the continuity of the voice call when the UE moves to the 2G/3G CS in the LTE network is to ensure that the UE is between the IMS-controlled Voice over Internet Protocol (VoIP) voice and the CS domain voice. Smooth switching.
  • VoIP Voice over Internet Protocol
  • FIG. 1 is a schematic diagram of an application scenario of a handover method of an SRVCC.
  • the UE moves from the 4G network covered by the Evolved Node B (eNB) to the 2G network covered by the Base Station Controller (BSC), and the MSCS receives
  • the MSCS exchanges the handover detection request message and the handover detection response message with the target base station, and performs allocation of related radio resources on the target base station;
  • the MSCS initiates a SIP establishment request process to the IMS according to the handover number, and simultaneously
  • the target base station performs the handover detection process, and sends a handover detection completion message to the MSCS after the handover is completed.
  • the IMS in FIG. 1 refers to the IMS.
  • the anchored network element is, for example, a Service Centralization and Continuity Application Server (SCC AS), a Session Border Controller (SBC), or an access transmission control function. (Acess Transfer Control Functionality, abbreviated as: ATCF) or other network elements;
  • SCC AS Service Centralization and Continuity Application Server
  • SBC Session Border Controller
  • ATCF Access Transmission Control Functionality
  • Figure 1 The SAE-GW for the SAE Gateway (SAE Gateway).
  • the flow of the SRVCC switching method in the related art may include the following steps S101 to S113.
  • step S101 the MSCS receives an SRVCC handover request message sent by the MME, where the SRVCC handover request message includes a handover number.
  • step S102 the MSCS sends a handover detection request message to the target base station.
  • step S103 the target base station feeds back a handover detection response message to the MSCS, where the handover detection response message is used to indicate that the target base station can perform allocation of related resources.
  • step S104 the MSCS sends an SRVCC handover response message to the MME.
  • step S105 the MSCS initiates a session migration process according to the handover number, that is, sends a SIP setup request message to the IMS.
  • steps S104 and S105 have no clear sequence, and may be executed sequentially or simultaneously.
  • step S106 the MSCS receives an update media message (ie, an 18X message) sent by the IMS, where the update media message is marked with an IMS packet supported by the IMS.
  • update media message ie, an 18X message
  • step S107 after the target base station performs handover detection, the target base station subsystem (Base Stataion Subsystem, BSS for short) sends a handover detection complete message to the MSCS.
  • BSS Base Stataion Subsystem
  • step S108 the MSCS returns a handover detection completion response message to the target base station.
  • step S109 the MSCS sends a PRACK message to the IMS, which is an acknowledgment request message for updating the media message in step S106.
  • steps S108 and S109 have no clear sequence, and may be executed sequentially or simultaneously.
  • step S110 the IMS returns a 200 OK message to the MSCS, which is a response message to the update media message in step S106.
  • step S111 the MSCS receives the INFO message sent by the IMS.
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • M denotes the number of SRVCC handover request messages.
  • step S113 the MME returns an SRVCC Completion Notification Response message to the MSCS.
  • the MME has been waiting for the SRVCC handover completion notification message sent by the MSCS.
  • the IMS side returns the message and the IMS side is incompatible, which may cause the MME to the MSCS.
  • the SRVCC handover cancel message is sent, so that the SRVCC handover success rate is reduced.
  • the flow of the SRVCC switching method in the related art may include the following steps S201 to S211.
  • steps S201 to S210 in the flow shown in FIG. 3 may refer to steps S101 to S110 in the flow shown in FIG. 2, and thus are not described herein again.
  • step S211 the MME sends an SRVCC handover cancel message to the MSCS.
  • the MSCS does not receive the INFO message sent by the IMS side for a long time, and after receiving the SRVCC handover completion notification message, the MME sends an SRVCC handover cancellation message to the MSCS, causing the handover to fail. SRVCC switching success rate.
  • the disclosure relates to network elements in an MME, an MSCS, a target base station, and an IMS.
  • the network element in the IMS is a network element in the 4G network, the MSCS and the target base station.
  • the MME exchanges messages with the base station and the gateway in the 4G network and the MSCS in the 2G/3G network respectively (as shown in FIG. 1).
  • the present disclosure provides the following specific embodiments that can be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.
  • FIG. 4 is a flowchart of a method for switching an SRVCC according to an embodiment of the present disclosure.
  • the method for switching the SRVCC provided by this embodiment is applicable to the case where the UE performs SRVCC handover when moving from the 4G network to the 2G/3G network, and the method may be performed by the switching device of the SRVCC, and the switching device of the SRVCC is combined by hardware and software. In a way, the device can be integrated into the processor of the MSCS for use by the processor.
  • the method of the present embodiment may include the steps described below.
  • step S410 the MSCS sends a SIP setup request message to the IMS according to the handover number obtained from the MME.
  • the method for switching the SRVCC provided by the embodiment of the present disclosure is a method for how to improve the SRVCC handover success rate in the process of performing SRVCC handover when the UE moves from the 4G network to the 2G/3G network.
  • the application scenario of the method provided by the embodiment of the present disclosure may also be as shown in FIG. 1. Since the MME is configured to perform UE reachability management, when the UE moves from the 4G network to the 2G/3G network, the MME sends an SRVCC handover request message to the MSCS. And carrying the handover number to be subjected to the SRVCC handover in the message, therefore, the MSCS can send a SIP establishment request message to the IMS according to the handover number acquired from the MME.
  • the IMS in the embodiment of the present disclosure refers to a network element that is anchored in the IMS after the UE moves to the 2G/3G network, and is established in the IMS, for example, SCC AS, SBC/ATCF, or other network. Yuan does not refer to the entire system of IMS.
  • step S420 after receiving the update media message sent by the IMS and the handover detection complete message sent by the target base station, the MSCS sends an SRVCC handover complete notification message to the MME.
  • the timing at which the MSCS sends the SRVCC handover complete notification message to the MME is different from the timing at which the MSCS sends the SRVCC handover complete notification message in the related art.
  • the MSCS receives the updated media message and the target base station sent by the IMS. After the transmitted handover detection complete message, the SRVCC handover completion notification message may be immediately sent to the MME.
  • the MSCS can directly send the SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS side, thereby preventing the IMS from returning the IMS for a long time after the MSCS sends the SIP setup request message.
  • the message causes the MME to fail to receive the SRVCC handover complete notification message for a long time, thereby actively sending an SRVCC handover cancel message to the MSCS to notify the MSCS to release the call.
  • the foregoing update media message is an 18X message, and may include 180, 181, 182, and 183, etc., for example, 180 indicates ringing, and 183 indicates when the callback is performed; the INFO message is sent by an application layer generally associated with the conference. Optional information.
  • the MSCS after receiving the SRVCC handover request message sent by the MME, the MSCS first exchanges the handover detection request message and the handover detection response message with the target base station, after the exchange is completed.
  • the MSCS can simultaneously interact with the MME and the IMS, send an SRVCC handover response message to the MME, and send a SIP setup request message to the IMS.
  • the MSCS waits for the handover detection complete message returned by the target base station and the 18X message and the INFO message returned by the IMS;
  • the MME sends an SRVCC handover cancellation message to the MSCS after receiving the SRVCC handover completion notification message sent by the MSCS for a long time. Inform MSCS to release the call.
  • the MSCS does not need to wait for the INFO message returned by the IMS, as long as the 18X message sent by the IMS is received and the handover detection sent by the target base station is completed.
  • the SRVCC handover completion notification message can be sent to the MME. It can be seen that the method provided by the embodiment of the present disclosure does not affect the advance of the handover process by optimizing the handover procedure of the MSCS side even if the IMS returns the INFO message for a long time. Cancellation can be achieved to ensure that the MME does not time out in advance, thereby ensuring the smooth completion of the handover process, and improving the SRVCC handover success rate, and correspondingly, enhancing the operator experience of the MSCS product.
  • the MSCS sends a SIP setup request message to the IMS according to the handover number obtained from the MME, and then the MSCS receives the update media message sent by the IMS and the handover detection complete message sent by the target base station. Then, the SRVCC handover completion notification message is sent to the MME, that is, the MSCS does not need to wait for the INFO message returned by the IMS, and may send the foregoing SRVCC handover completion notification message to the MME, thereby preventing the IMS from returning the INFO message for a long time, resulting in the MME being long.
  • the SRVCC handover completion notification message is not received at the time, and the SRVCC handover cancellation message is actively sent to the MSCS to notify the MSCS to release the call, which is beneficial to improving the SRVCC handover success rate.
  • the method provided in this embodiment solves the problem that the SRVCC handover is performed in the related art, which may result in a low index of the SRVCC handover success rate due to the inconsistency and compatibility of the network element processing message in the IMS.
  • FIG. 5 is a flowchart of another method for switching an SRVCC according to an embodiment of the present disclosure.
  • the method provided by the embodiment of the present disclosure may further include the following steps S400 and S402 before step S410.
  • step S400 the MSCS receives the SRVCC handover request message sent by the MME, where the SRVCC handover request message includes the handover number and the identity information of the target base station.
  • step S401 the MSCS sends a handover detection request message to the target base station according to the identification information of the target base station.
  • step S402 the MSCS receives a handover detection response message sent by the target base station, where the handover detection response message is used to indicate that the target base station has the capability of allocating radio resources.
  • the MSCS sends a SIP setup request message according to the handover number obtained from the MME.
  • the manner in which the MSCS obtains the handover number and the radio resource is: the UE moves from the 4G network to the 2G/3G.
  • the MME confirms the target base station according to the mobile of the UE, and sends an SRVCC handover request message carrying the handover number and the identity information of the target base station to the MSCS, and then the MSCS performs a handover detection request message and handover detection according to the acquired message with the target base station.
  • the MSCS initiates a callback migration process based on the handover number acquired in step S400, i.e., transmits a SIP setup request message to the IMS.
  • the method provided by the embodiment of the present disclosure may further include: Step S430, the MSCS calculates the SRVCC handover success rate according to the number of times the SRVCC handover completion notification message is sent and the number of times the SRVCC handover request message is received.
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • M denotes the number of SRVCC handover request messages.
  • the foregoing steps S400-S420 may be repeatedly performed, and steps S400-S420 are performed as long as the conditions for the UE to move from the 4G network to the 2G/3G network are satisfied. Therefore, the MSCS can calculate the SRVCC handover success rate in the time period according to the number of times the SRVCC handover completion notification message is sent and the number of times the SRVCC handover request message is received within a predetermined period of time.
  • the MSCS may send an SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS, thus improving the SRVCC handover success rate to some extent.
  • the success rate of the IMS message returned by the IMS is long, and the success rate of the SRVCC handover is reduced by about 20%, which is actually different commercial.
  • the data in the environment is still quite different. Therefore, in the method provided by the embodiment of the present disclosure, the SRVCC handover success rate is improved by a reasonable optimization of the SRVCC handover procedure.
  • a timer may be provided in the MSCS in the embodiment of the present disclosure.
  • FIG. 6 another flowchart of a method for switching an SRVCC according to an embodiment of the present disclosure is provided.
  • the method provided by the embodiment of the present disclosure may further include: after step S110, the MSCS starts the timer.
  • the method may further include: Step S421, sending a cancel SRVCC handover notification message to the MME when the timer reaches the preset time without receiving the INFO message sent by the IMS.
  • the MSCS side may reserve a certain time to wait for the INFO message returned by the IMS, that is, the timer may be set in the MSCS, and after the MSCS sends the SIP setup request message, the timer is started. Waiting for the INFO message returned by the subsequent IMS, if the INFO message has not been received within the preset time, the MSCS may actively send a cancel SRVCC handover notification message to the MME to release the current call.
  • the manner in which the MSCS calculates the SRVCC handover success rate may be: the number of times the MSCS sends the SRVCC handover completion notification message, the number of times the SRVCC handover request message is received, and the sending cancellation SRVCC handover notification message. The number of times, calculate the SRVCC switching success rate. In practical applications, the calculation formula for the SRVCC switching success rate can be:
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • K denotes the number of times the SRVCC handover notification message is cancelled
  • M denotes the number of SRVCC handover request messages.
  • the method for switching the SRVCC shown in FIG. 5 and FIG. 6 may further include: the MSCS sending an SRVCC handover response message to the MME. It should be noted that the embodiment of the present disclosure does not limit the sequence in which the MSCS sends the SRVCC handover response message and the SIP establishment request message.
  • the method for switching the SRVCC shown in FIG. 5 and FIG. 6 may further include: the MSCS receives the 18X message sent by the IMS, and the MSCS receives the handover detection complete message sent by the target base station. It should be noted that the embodiment of the present disclosure does not limit the sequence in which the MSCS receives the 18X message and the handover detection complete message.
  • the MSCS may further include: the MSCS sends a handover detection complete response message to the target base station, the MSCS sends a PRACK message to the IMS, the MSCS receives the 200 OK message sent by the IMS, and the MSCS receives the INFO message sent by the IMS. It should be noted that the embodiment of the present disclosure does not limit the sequence in which the MSCS sends the handover detection complete response message, sends the PRACK message, and receives the INFO message.
  • the method for switching the SRVCC shown in FIG. 5 and FIG. 6 may further include: after the step S420, the MSCS receives the SRVCC handover completion notification response message returned by the MME, and then ends the handover procedure.
  • FIG. 7 is a flowchart of still another method for switching an SRVCC according to an embodiment of the present disclosure.
  • the handover method of the SRVCC provided in this embodiment is applicable to a case where the UE performs SRVCC handover when moving from a 4G network to a 2G/3G network.
  • the method can be implemented by a switching device of the SRVCC, which is implemented by a combination of hardware and software, and the device can be integrated in the processor of the MME for use by the processor.
  • the method of the present embodiment may include steps S510 and S520 described below.
  • step S510 the MME sends an SRVCC handover request message to the MSCS.
  • the method for switching the SRVCC provided by the embodiment of the present disclosure is a method for how to improve the SRVCC handover success rate in the process of performing SRVCC handover when the UE moves from the 4G network to the 2G/3G network.
  • the application scenario of the method provided by the embodiment of the present disclosure may also be as shown in FIG. 1. Since the MME is configured to perform UE reachability management, when the UE moves from the 4G network to the 2G/3G network, the MME may send an SRVCC handover request to the MSCS. The message carries the handover number to be subjected to the SRVCC handover. Therefore, the MSCS can send a SIP establishment request message to the IMS according to the handover number acquired from the MME.
  • step S520 the MME receives the SRVCC handover complete notification message sent by the MSCS, and the SRVCC handover complete notification message is sent by the MSCS to the MME after receiving the update media message sent by the IMS and the handover detection complete message sent by the target base station.
  • the timing at which the MSCS sends the SRVCC handover complete notification message to the MME is different from the timing at which the MSCS sends the SRVCC handover complete notification in the related art.
  • the MSCS receives the updated media message and the target base station sent by the IMS. After the transmitted handover detection complete message, the SRVCC handover completion notification message may be immediately sent to the MME.
  • the MSCS can directly send an SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS side, and the MME can receive the SRVCC handover completion notification message in a short time, thereby avoiding the MSCS.
  • the IMS does not return the INFO message for a long time, causing the MME to fail to receive the SRVCC handover complete notification message for a long time, thereby actively sending an SRVCC handover cancellation message to the MSCS to notify the MSCS to release the call.
  • the IMS in the embodiment of the present disclosure refers to a network element that is anchored in the IMS after the UE moves to the 2G/3G network, and is established in the IMS, for example, SCC AS, SBC/ATCF, or other network. Yuan does not refer to the entire system of IMS.
  • the above update media message is an 18X message, which may include 180, 181, 182, and 183, etc., for example, 180 indicates ringing, and 183 indicates when the callback is in progress.
  • the above INFO message is optional information for sending an application layer that is usually associated with a conference.
  • the MSCS after receiving the SRVCC handover request message sent by the MME, the MSCS first exchanges the handover detection request message and the handover detection response message with the target base station, after the exchange is completed.
  • the MSCS can simultaneously interact with the MME and the IMS, send an SRVCC handover response message to the MME, and send a SIP setup request message to the IMS. Subsequently, the MSCS waits for the handover detection complete message returned by the target base station and the 18X message and the INFO message returned by the IMS.
  • the MME sends an SRVCC handover cancellation message to the MSCS after receiving the SRVCC handover completion notification message sent by the MSCS for a long time. Inform MSCS to release the call.
  • the MSCS does not need to wait for the INFO message returned by the IMS, as long as the 18X message sent by the IMS is received and the handover detection sent by the target base station is completed.
  • the message may send an SRVCC handover complete notification message to the MME.
  • the MME sends an SRVCC handover request message to the MSCS, and receives an SRVCC handover complete notification message sent by the MSCS, where the SRVCC handover complete notification message is that the MSCS receives the information management.
  • the message is sent to the MME.
  • the MSCS can send the above-mentioned SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS, so that the IMS does not return the INFO message for a long time, and the MME cannot receive the SRVCC handover completion notification message for a long time, thereby
  • the SRVCC handover cancellation message is sent to the MSCS to notify the MSCS to release the call, which is beneficial to improve the SRVCC handover success rate.
  • the method provided in this embodiment solves the problem that the SRVCC handover is performed in the related art, which may result in a low index of the SRVCC handover success rate due to the inconsistency and compatibility of the network element processing message in the IMS.
  • the SRVCC handover request message sent by the MME in the step S510 includes the identifier information of the target base station, where the SRVCC handover request message is used to instruct the MSCS to send a handover detection request message to the target base station according to the identifier information of the target base station. And receiving a handover detection response message sent by the target base station, where the handover detection response message is used to indicate that the target base station has the capability of allocating radio resources.
  • the MSCS may exchange the detection request message and the handover detection response message with the target base station according to the identifier information of the target base station, and from the handover detection response message. It is known that the base station can perform allocation of radio resources, that is, has switching capability.
  • the SRVCC handover request message sent by the MME in step S410 may further include a handover number.
  • the SRVCC handover request message is further used to instruct the MSCS to send a Session Initiation Protocol SIP Setup Request message to the IMS according to the handover number. That is, after receiving the handover number by receiving the SRVCC handover request message, the MSCS may send a SIP establishment request message to the IMS according to the handover number.
  • the way in which the MSCS obtains the handover number and the radio resource is: when the UE moves from the 4G network to the 2G/3G network, the MME confirms the target base station according to the mobility of the UE, and sends the identifier carrying the handover number and the target base station to the MSCS.
  • the SRVCC handover request message of the information the MSCS performs an interaction between the handover detection request message and the handover detection response message with the target base station according to the obtained message, and acquires the radio resource allocated by the target base station for the handover number from the handover detection response message.
  • the MSCS initiates a callback migration process according to the handover number obtained from the SRVCC handover request message, that is, sends a SIP setup request message to the IMS.
  • FIG. 8 is a flowchart of still another method for switching an SRVCC according to an embodiment of the present disclosure.
  • the method provided by the embodiment of the present disclosure may further include: Step S530, the MME calculates, according to the number of times the SRVCC handover completion notification message is received and the number of times the SRVCC handover request message is sent. SRVCC switching success rate.
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • M denotes the number of SRVCC handover request messages.
  • the steps performed by the foregoing steps S510-S520 and the MSCS side may be repeatedly performed, and the MME performs the steps as long as the conditions for the UE to move from the 4G network to the 2G/3G network are satisfied. S510 to S520, and the MSCS performs the corresponding steps. Therefore, the MME may calculate the SRVCC handover success rate in the time period according to the number of times the SRVCC handover completion notification message is received and the number of times the SRVCC handover request message is sent within a predetermined period of time.
  • the MSCS may send an SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS, thus improving the SRVCC handover success rate to some extent.
  • FIG. 9 a flowchart of still another method for switching an SRVCC according to an embodiment of the present disclosure.
  • the method provided by the embodiment of the present disclosure may further include: after step S520, the MME receives the cancel SRVCC handover notification message sent by the MSCS.
  • the MSCS side may reserve a certain time to wait for the INFO message returned by the IMS, that is, after the MSCS sends a SIP establishment request message to the IMS by setting a timer in the MSCS, The timer waits for the INFO message returned by the subsequent IMS. If the INFO message has not been received within the preset time, the MSCS may actively send a cancel SRVCC handover notification message to the MME to release the current call. Therefore, after receiving the SRVCC handover completion notification message, the MME in the embodiment of the present disclosure may further receive a cancel SRVCC handover notification message for releasing the current call.
  • the method provided in this embodiment may further include: Step S550, the MME calculates the SRVCC switch according to the number of times the SRVCC handover completion notification message is received, the number of times the SRVCC handover request message is sent, and the number of times the SRVCC handover notification message is cancelled. Success rate.
  • the calculation formula for the SRVCC switching success rate can be:
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • K denotes the number of times the SRVCC handover notification message is cancelled
  • M denotes the number of SRVCC handover request messages.
  • the method for switching the SRVCC shown in FIG. 8 and FIG. 9 may further include an operation of interaction between the MSCS and the target base station, the IMS, and the MME after the MME sends the SRVCC handover request message to the MSCS.
  • the operation has been described in detail in the above embodiment in which the MSCS is the main body, and therefore will not be described herein.
  • FIG. 10 is a flow chart of interaction between the SRVCC and the handover method of the SRVCC according to an embodiment of the present disclosure.
  • the method of switching the SRVCC shown in FIG. 9 may include the steps described below.
  • step S301 the MSCS receives the SRVCC handover request message sent by the MME, where the SRVCC handover request message includes the handover number and the identity information of the target base station.
  • step S302 the MSCS sends a handover detection request message to the target base station according to the identification information of the target base station.
  • step S303 the target base station feeds back a handover detection response message to the MSCS, where the handover detection response message is used to indicate that the target base station can perform allocation of related resources, and has handover capability.
  • step S304 the MSCS sends an SRVCC handover response message to the MME.
  • step S305 the MSCS initiates a session migration process according to the handover number, that is, sends a SIP setup request message to the IMS.
  • steps S304 and S305 have no clear sequence, and may be executed sequentially or simultaneously.
  • step S306 the MSCS receives the 18X message sent by the IMS, and the 18X message is marked with the INFO packet supported by the IMS.
  • the target BSS sends a handover detection complete message to the MSCS.
  • steps S306 and S307 in this embodiment have no clear sequence, and may be executed sequentially or simultaneously.
  • the MSCS sends an SRVCC handover complete notification message to the MME.
  • the MSCS can calculate the SRVCC handover success rate.
  • the calculation method of the SRVCC handover success rate has been described in detail in the foregoing embodiment, and details are not described herein again.
  • the MSCS may directly send the SRVCC handover completion notification message. That is to say, the MSCS is not limited by the timing of the network element message in the IMS, and does not need to wait for the IMS message of the IMS all the time, which can greatly improve the success rate of the SRVCC handover.
  • step S309 the MSCS returns a handover detection completion response message to the target base station.
  • step S310 the MME returns an SRVCC Completion Notification Response message to the MSCS.
  • step S311 the MSCS sends a PRACK message to the IMS, which is an acknowledgment request message for the 18X message in step S306.
  • step S312 the IMS returns a 200 OK message to the MSCS, which is a response message to the 18X message in step S306.
  • step S313 the MSCS receives the INFO message sent by the IMS; after receiving the INFO message returned by the IMS, the MSCS can normally process the current call, that is, establish the SRVCC service.
  • steps S308, S309, and S313 in this embodiment have no clear sequence, and may be executed sequentially or simultaneously.
  • FIG. 11 is a schematic structural diagram of a SRVCC switching apparatus according to an embodiment of the present disclosure.
  • the switching device of the SRVCC provided in this embodiment is applicable to the case where the UE performs SRVCC handover when moving from the 4G network to the 2G/3G network, and the switching device of the SRVCC is implemented by combining hardware and software, and the device can be integrated in the MSCS.
  • the processor for the processor to call.
  • the SRVCC switching apparatus of this embodiment may include: a transmitting module 11 and a receiving module 12.
  • the sending module 11 is configured to send a SIP setup request message to the IMS according to the handover number obtained from the MME.
  • the SRVCC switching apparatus solves the problem of how to improve the SRVCC handover success rate during the execution of the SRVCC handover when the UE moves from the 4G network to the 2G/3G network.
  • the application scenario of the apparatus provided by the embodiment of the present disclosure may also be as shown in FIG. 1. Since the MME is configured to perform UE reachability management, when the UE moves from the 4G network to the 2G/3G network, the MME sends an SRVCC handover request message to the MSCS. And carrying the handover number to be subjected to the SRVCC handover in the message. Therefore, the sending module 11 can send a SIP setup request message to the IMS according to the handover number acquired from the MME.
  • the IMS in the embodiment of the present disclosure refers to a network element that is anchored in the IMS after the UE moves to the 2G/3G network, and is established in the IMS, for example, SCC AS, SBC/ATCF, or other network. Yuan does not refer to the entire system of IMS.
  • the receiving module 12 is configured to receive an update media message sent by the IMS and a handover detection complete message sent by the target base station.
  • the sending module 11 is further configured to send an SRVCC handover complete notification message to the MME after the receiving module 12 receives the update media message and the handover detection complete message.
  • the timing at which the sending module 11 sends the SRVCC handover complete notification message to the MME is different from the timing at which the MSCS sends the SRVCC handover complete notification.
  • the sending module 11 may immediately send the SRVCC handover completion notification message to the MME.
  • the apparatus provided by the embodiment of the present disclosure does not need to wait for the INFO message returned by the IMS side, and the sending module 11 can directly send the SRVCC handover completion notification message to the MME, thereby preventing the sending module 11 from transmitting the SIP establishment request message after the IMS.
  • the MME may not receive the SRVCC handover completion notification message for a long time, so as to actively send an SRVCC handover cancellation message to the MSCS to notify the MSCS to release the call.
  • the update media message is an 18X message, and may include 180, 181, 182, and 183, etc., for example, 180 indicates ringing, and 183 indicates when the callback is in progress.
  • the above INFO message is optional information for sending an application layer that is usually associated with a conference.
  • the handover apparatus of the SRVCC provided by the embodiment of the present disclosure does not need to wait for the INFO message returned by the IMS in the process of performing the handover, as long as the 18X message and the target sent by the IMS are received.
  • the handover detection completion message sent by the base station may send an SRVCC handover completion notification message to the MME.
  • the switching device of the SRVCC provided by the embodiment of the present disclosure is configured to perform the switching method of the SRVCC provided by the embodiment shown in FIG. 4 of the present disclosure, and has a corresponding functional module, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the receiving module 12 is further configured to: before the sending module 11 sends a SIP setup request message to the IMS, receive an SRVCC handover request message sent by the MME, where the SRVCC handover request message includes a handover number and a target base station.
  • the sending module 11 is further configured to send a handover detection request message to the target base station according to the identifier information of the target base station received by the receiving module 12;
  • the receiving module 12 is further configured to receive a handover detection response message sent by the target base station, where the handover detection response is The message is used to indicate that the target base station has the ability to allocate radio resources.
  • the transmitting module 11 transmits a SIP setup request message according to the handover number acquired from the MME.
  • the way in which the MSCS obtains the handover number and the radio resource is: when the UE moves from the 4G network to the 2G/3G network, the MME confirms the target base station according to the mobility of the UE, and sends the identifier carrying the handover number and the target base station to the MSCS.
  • the SRVCC handover request message of the information the MSCS performs the interaction between the handover detection request message and the handover detection response message with the target base station according to the obtained message, and learns from the handover detection response message that the target base station can perform the allocation of the radio resource, that is, has the handover ability.
  • the MSCS initiates a callback migration process according to the obtained handover number, that is, sends a SIP setup request message to the IMS.
  • FIG. 12 is a schematic structural diagram of another SRVCC switching apparatus according to an embodiment of the present disclosure.
  • the apparatus provided in this embodiment may further include: a calculation module 13 configured to receive the number of SRVCC handover completion notification messages according to the sending module 11 and the number of times the receiving module 12 receives the SRVCC handover request message. , calculate the SRVCC switching success rate.
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • M denotes the number of SRVCC handover request messages.
  • the operations performed by the sending module 11 and the receiving module 12 may be repeatedly performed, as long as the conditions for the UE to move from the 4G network to the 2G/3G network are satisfied, and the foregoing operations are performed. . Therefore, the calculation module 13 can calculate the SRVCC handover success rate in the time period according to the number of times the SRVCC handover completion notification message is sent and the number of times the SRVCC handover request message is received within a certain preset time period.
  • the switching device of the SRVCC provided by the embodiment of the present disclosure is configured to perform the switching method of the SRVCC provided by the embodiment shown in FIG. 5 of the present disclosure, and has a corresponding functional module, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 13 is a schematic structural diagram of still another SRVCC switching apparatus according to an embodiment of the present disclosure.
  • the MSCS of the embodiment may be configured with a timer.
  • the apparatus provided in this embodiment may further include: an opening module 14 configured to send a SIP setup request message to the IMS in the sending module 11 Afterwards, the sending module 11 is further configured to send a cancel SRVCC switching notification message to the MME when the INFO message sent by the IMS is not received when the timer reaches the preset time.
  • the MSCS side may reserve a certain time to wait for the INFO message returned by the IMS, that is, the timer may be set in the MSCS, and after the sending module 11 sends the SIP establishment request message, the timer is started.
  • the sending module 11 may send a cancel SRVCC handover notification message to the MME to release the current call.
  • the apparatus provided in this embodiment may also include: a calculation module 13.
  • the calculation module 13 calculates the SRVCC handover success rate according to the number of times the sending module 11 sends the SRVCC handover completion notification message, the number of times the receiving module 12 receives the SRVCC handover request message, and the number of times the sending module 11 sends the cancel SRVCC handover notification message. , calculate the SRVCC switching success rate.
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • K denotes the number of times the SRVCC handover notification message is cancelled
  • M denotes the number of SRVCC handover request messages.
  • the switching device of the SRVCC provided by the embodiment of the present disclosure is configured to perform the switching method of the SRVCC provided by the embodiment shown in FIG. 6 of the present disclosure, and has a corresponding functional module, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the transmitting module 11 and the receiving module 12 in the embodiments shown in FIG. 11 to FIG. 13 of the present disclosure may be implemented by a transceiver of the MSCS.
  • the calculation module 13 and the opening module 14 may be implemented by a processor of the MSCS, which may be, for example, a central processing unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, referred to as : ASIC), or one or more integrated circuits that implement embodiments of the present disclosure.
  • CPU central processing unit
  • ASIC Application Specific Integrated Circuit
  • FIG. 14 is a schematic structural diagram of still another SRVCC switching apparatus according to an embodiment of the present disclosure.
  • the switching device of the SRVCC provided in this embodiment is applicable to the case where the UE performs the SRVCC handover when moving from the 4G network to the 2G/3G network, and the switching device of the SRVCC is implemented by combining hardware and software, and the device may be integrated in the MME.
  • the processor for the processor to call.
  • the SRVCC switching apparatus of this embodiment may include: a transmitting module 21 and a receiving module 22.
  • the sending module 21 is configured to send an SRVCC Handover Request message to the MSCS.
  • the SRVCC switching apparatus is a method for how to improve the SRVCC handover success rate during the execution of the SRVCC handover when the UE moves from the 4G network to the 2G/3G network.
  • the application scenario of the device provided by the embodiment of the present disclosure may also be as shown in FIG. 1. Since the MME is configured to perform UE reachability management, when the UE moves from the 4G network to the 2G/3G network, the sending module 21 of the MME may send the message to the MSCS.
  • the SRVCC handover request message is sent, and the handover number to be subjected to the SRVCC handover is carried in the message. Therefore, the MSCS can send a SIP setup request message to the IMS according to the handover number obtained from the MME.
  • the receiving module 22 is configured to receive an SRVCC handover complete notification message sent by the MSCS, where the SRVCC handover complete notification message is sent by the MSCS to the MME after receiving the update media message sent by the information management system IMS and the handover detection complete message sent by the target base station. .
  • the timing at which the MSCS sends the SRVCC handover complete notification message to the MME is different from the timing at which the MSCS sends the SRVCC handover complete notification. Specifically, after receiving the update media message sent by the IMS and the handover detection complete message sent by the target base station, the MSCS may immediately send the SRVCC handover completion notification message to the MME. In the apparatus provided by the embodiment of the present disclosure, the MSCS may send an SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS side, and the receiving module 22 of the MME may receive the SRVCC handover completion notification message in a short time.
  • the IMS does not return the INFO message for a long time, so that the MME does not receive the SRVCC handover complete notification message for a long time, and thus actively sends an SRVCC handover cancel message to the MSCS to notify the MSCS to release the call. phenomenon.
  • the IMS in the embodiment of the present disclosure refers to a network element that is anchored in the IMS after the UE moves to the 2G/3G network, and is established in the IMS, for example, SCC AS, SBC/ATCF, or other network. Yuan does not refer to the entire system of IMS.
  • the above update media message is an 18X message, which may include 180, 181, 182, and 183, etc., for example, 180 indicates ringing, and 183 indicates when the callback is in progress.
  • the above INFO message is optional information for sending an application layer that is usually associated with a conference.
  • the handover apparatus of the SRVCC provided by the embodiment of the present disclosure does not need to wait for the INFO message returned by the IMS in the process of performing the handover, as long as the 18X message and the target sent by the IMS are received.
  • the handover detection completion message sent by the base station may send an SRVCC handover completion notification message to the MME.
  • the technical solution provided by the embodiment of the present disclosure by optimizing the handover process on the MSCS side, does not affect the early cancellation of the handover process even if the IMS returns the INFO message for a long time, so that the MME can not guarantee the timeout in advance. Therefore, the handover process is successfully completed, and the SRVCC handover success rate is improved, and accordingly, the operator experience of the MSCS product is enhanced.
  • the switching device of the SRVCC provided by the embodiment of the present disclosure is configured to perform the switching method of the SRVCC provided by the embodiment shown in FIG. 7 of the present disclosure, and has a corresponding functional module, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the SRVCC handover request message sent by the sending module 21 includes the identifier information of the target base station, where the SRVCC handover request message is used to instruct the MSCS to send a handover detection request message to the target base station according to the identifier information of the target base station, and And receiving a handover detection response message sent by the target base station, where the handover detection response message is used to indicate that the target base station has the capability of allocating radio resources. That is, after receiving the identifier information of the target base station by receiving the SRVCC handover request message, the MSCS may exchange the detection request message and the handover detection response message with the target base station according to the identifier information of the target base station, and from the handover detection response message. It is known that the base station can perform allocation of radio resources, that is, has switching capability.
  • the SRVCC handover request message sent by the sending module 21 may further include a handover number, where the SRVCC handover request message is further used to instruct the MSCS to send a Session Initiation Protocol SIP Setup Request message to the IMS according to the handover number. That is, after receiving the handover number by receiving the SRVCC handover request message, the MSCS may send a SIP establishment request message to the IMS according to the handover number.
  • the way in which the MSCS obtains the handover number and the radio resource is: when the UE moves from the 4G network to the 2G/3G network, the MME confirms the target base station according to the mobility of the UE, and sends the identifier carrying the handover number and the target base station to the MSCS.
  • the SRVCC handover request message of the information the MSCS performs an interaction between the handover detection request message and the handover detection response message with the target base station according to the obtained message, and acquires the radio resource allocated by the target base station for the handover number from the handover detection response message.
  • the MSCS initiates a callback migration process according to the handover number obtained from the SRVCC handover request message, that is, sends a SIP setup request message to the IMS.
  • FIG. 15 is a schematic structural diagram of still another SRVCC switching apparatus according to an embodiment of the present disclosure.
  • the apparatus provided in this embodiment may further include: a calculation module 23 configured to receive the number of SRVCC handover completion notification messages according to the receiving module 22 and the number of times the sending module 21 sends the SRVCC handover request message. , calculate the SRVCC switching success rate.
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • M denotes the number of SRVCC handover request messages.
  • the operations performed by the sending module 21 and the receiving module 22 and the operations performed by the MSCS side may be repeatedly performed.
  • the transmitting module 21 and the receiving module 22 perform the above operations as long as the conditions for the UE to move from the 4G network to the 2G/3G network are satisfied, and the MSCS performs the corresponding operation. Therefore, the calculation module 23 of the MME can calculate the SRVCC handover success rate in the time period according to the number of times the SRVCC handover completion notification message is received and the number of times the SRVCC handover request message is sent within a predetermined period of time.
  • the MSCS can send the SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS, thus improving the SRVCC handover success rate to some extent.
  • the switching device of the SRVCC provided by the embodiment of the present disclosure is configured to perform the switching method of the SRVCC provided by the embodiment shown in FIG. 8 of the present disclosure, and has a corresponding functional module, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the receiving module 22 is further configured to receive the cancel SRVCC handover notification message sent by the MSCS; the calculation module 23 is further configured to receive the SRVCC handover completion notification message according to the receiving module 22.
  • the MSCS side may also reserve a certain time to wait for the INFO message returned by the IMS, that is, after the MSCS sends a SIP establishment request message to the IMS by setting a timer in the MSCS, The timer waits for the IMS message returned by the subsequent IMS. If the INFO message has not been received within the preset time, the MSCS may actively send a cancel SRVCC handover notification message to the MME to release the current call. Therefore, in the embodiment of the present disclosure, after receiving the SRVCC handover completion notification message, the receiving module 22 of the MME may further receive a cancel SRVCC handover notification message for releasing the current call.
  • the formula for calculating the SRVCC switching success rate by the calculation module 23 in this embodiment may also be:
  • P denotes the SRVCC handover success rate
  • N denotes the number of SRVCC handover completion notification messages
  • K denotes the number of times the SRVCC handover notification message is cancelled
  • M denotes the number of SRVCC handover request messages.
  • the switching device of the SRVCC provided by the embodiment of the present disclosure is configured to perform the switching method of the SRVCC provided by the embodiment shown in FIG. 9 of the present disclosure, and has a corresponding functional module, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the sending module 21 and the receiving module 22 in the embodiments shown in FIG. 14 to FIG. 15 can be implemented by using a transceiver of the MSCS, and the computing module 23 can be implemented by using a processor of the MSCS.
  • a processor of the MSCS For example, it may be a CPU, or an ASIC, or one or more integrated circuits that implement embodiments of the present disclosure.
  • a program to instruct related hardware e.g., a processor
  • a computer readable storage medium such as a read only memory, disk or optical disk. Wait.
  • all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function.
  • the MSCS sends a SIP setup request message to the IMS according to the handover number obtained from the MME, and then the MSCS receives the update media message sent by the IMS and the target base station sends the message. After the handover detection completion message, the SRVCC handover completion notification message is sent to the MME.
  • the MSCS can send the above-mentioned SRVCC handover completion notification message to the MME without waiting for the INFO message returned by the IMS, so that the IMS does not return the INFO message for a long time, and the MME cannot receive the SRVCC handover completion notification message for a long time, thereby
  • the SRVCC handover cancellation message is sent to the MSCS to notify the MSCS to release the call, which is beneficial to improve the SRVCC handover success rate.
  • the embodiment of the present disclosure solves the problem of performing the SRVCC handover in the related art, which may result in a low index of the SRVCC handover success rate due to the inconsistency and compatibility of the network element processing message in the IMS.

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Abstract

本文公布一种单信道连续业务的切换方法和装置。本公开实施例中的单信道连续业务的切换方法包括：移动交互中心服务器(MSCS)根据从移动性管理实体(MME)中获取的切换号码，向信息管理系统(IMS)发送会话初始协议(SIP)建立请求消息；MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送单信道连续业务(SRVCC)切换完成通知消息。

Description

一种单信道连续业务的切换方法和装置 技术领域
本申请涉及无线通信技术领域，例如一种单信道连续业务的切换方法和装置。
背景技术
随着无线通信技术的发展和普及，无线通信网络已经被应用到人们日常生活的各个方面。例如，长期演进(Long Term Evolution，简称为：LTE)系统中已经提出一种基于信息管理系统(Information Management System，简称为：IMS)的语音业务(Voice over LTE，简称为：VoLTE)。
当前主流的LTE语音解决方案，就是部署IMS网络和相应的应用服务器，以提供VoLTE。在使用VoLTE的场景下，初期会面临的由于网络覆盖不全而导致的语音通话可能中断的问题，单信道连续业务(Single Radio Voice Call Continuity，简称为：SRVCC)技术可以在第四代移动通信技术(4th Generation，简称为：4G)信号较弱、第二代移动通信技术(2-Generation，简称为：2G)或第三代移动通信技术(3rd-Generation，简称为：3G)信号较强的时候，将4G的语音通话切换到2G或3G的网络中，从而解决4G初期的网络部署问题。SRVCC是一种使用LTE接入的IMS语音服务网络提供单信道语音连续性的解决方案，SRVCC在用户设备(User Equipment，简称为：UE)从LTE移动到客户机/服务器(Client/Server，简称为：CS)的时候，建立CS分支，并锚定IMS中的一个网元，通过该锚定的网元将CS呼叫和原IMS呼叫连接起来，从而形成完整的呼叫链，保持了原IMS域的呼叫能够在切换后继续进行。然而，移动交换中心(Mobile Switching Center，简称为：MSC)Server(即MSCS)在接收到移动性管理实体(MME Mobile Managenment Entity，简称为：MME)发送 的切换请求消息后，根据该消息中携带的切换号码发起到IMS的会话初始协议(Session Initiation Protocol，简称为：SIP)建立请求过程，并且在接收到更新媒体消息(18X)、切换检测(Handover Detection，简称为：HO)完成消息和INFO消息后，才向MME发送SRVCC切换完成通知消息，并计算SRVCC切换成功率。
公开内容
以下是对本文详细描述的主题的概述。本概述并非是为限制权利要求的保护范围。
本公开实施例提供了一种单信道连续业务的切换方法和装置，以解决采用相关技术中执行SRVCC切换的过程，可能由于IMS中网元处理消息不及时和兼容性等原因，而导致计算出的SRVCC切换成功率的指标较低的问题。
第一方面，本公开实施例提供一种单信道连续业务的切换方法，包括：移动交互中心服务器MSCS根据从移动性管理实体MME中获取的切换号码，向信息管理系统IMS发送会话初始协议SIP建立请求消息；所述MSCS在接收到所述IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送单信道连续业务SRVCC切换完成通知消息。
在第一方面的第一种可能的实现方式中，所述MSCS向IMS发送SIP建立请求消息之前，所述方法包括：所述MSCS接收所述MME发送的SRVCC切换请求消息，所述SRVCC切换请求消息中包括所述切换号码和所述目标基站的标识信息；所述MSCS根据所述目标基站的标识信息向所述目标基站发送切换检测请求消息；所述MSCS接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
在第一方面的第二种可能的实现方式中，所述方法还包括：所述MSCS根据发送SRVCC切换完成通知消息的次数和接收SRVCC切换请求消息的次数，计算SRVCC切换成功率。
在第一方面的第三种可能的实现方式中，所述MSCS中设置有定时器，所述MSCS向IMS发送SIP建立请求消息之后，所述方法还包括：所述MSCS开 启所述定时器；所述MSCS向MME发送SRVCC切换完成通知消息之后，所述方法还包括：在所述定时器达到预设时间未接收到所述IMS发送的INFO消息时，向所述MME发送取消SRVCC切换通知消息。
在第一方面的第四种可能的实现方式中，所述方法还包括：所述MSCS根据发送SRVCC切换完成通知消息的次数、接收SRVCC切换请求消息的次数和发送取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
第二方面，本公开实施例提供一种单信道连续业务的切换方法，包括：移动性管理实体MME向移动交互中心服务器MSCS发送单信道连续业务SRVCC切换请求消息；所述MME接收所述MSCS发送的SRVCC切换完成通知消息，所述SRVCC切换完成通知消息为所述MSCS在接收到信息管理系统IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向所述MME发送的。
在第二方面的第一种可能的实现方式中，所述SRVCC切换请求消息中包括目标基站的标识信息，所述SRVCC切换请求消息用于指示所述MSCS根据所述目标基站的标识信息向所述目标基站发送切换检测请求消息，并接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
在第二方面的第二种可能的实现方式中，所述SRVCC切换请求消息中包括切换号码，所述SRVCC切换请求消息用于指示所述MSCS根据所述切换号码向所述IMS发送会话初始协议SIP建立请求消息。
在第二方面的第三种可能的实现方式中，所述方法还包括：
所述MME根据接收SRVCC切换完成通知消息的次数和发送SRVCC切换请求消息的次数，计算SRVCC切换成功率。
在第二方面的第四种可能的实现方式中，所述方法还包括：所述MME接收所述MSCS发送的取消SRVCC切换通知消息；所述MME根据接收SRVCC切换完成通知消息的次数、发送SRVCC切换请求消息的次数和接收取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
第三方面，本公开实施例提供一种单信道连续业务的切换装置，所述装置设置于移动交互中心服务器MSCS中，所述装置包括：发送模块和接收模块； 发送模块配置为根据从移动性管理实体MME中获取的切换号码，向信息管理系统IMS发送会话初始协议SIP建立请求消息；接收模块配置为接收所述IMS发送的更新媒体消息和目标基站发送的切换检测完成消息；所述发送模块还配置为在所述接收模块接收到所述更新媒体消息和所述切换检测完成消息后，向MME发送单信道连续业务SRVCC切换完成通知消息。
在第三方面的第一种可能的实现方式中，所述接收模块还配置为在所述发送模块向IMS发送SIP建立请求消息之前，接收所述MME发送的SRVCC切换请求消息，所述SRVCC切换请求消息中包括所述切换号码和所述目标基站的标识信息；所述发送模块还配置为根据所述接收模块接收的所述目标基站的标识信息向所述目标基站发送切换检测请求消息；所述接收模块还配置为接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
在第三方面的第二种可能的实现方式中，所述装置还包括：计算模块，配置为根据所述发送模块发送SRVCC切换完成通知消息的次数和所述接收模块接收SRVCC切换请求消息的次数，计算SRVCC切换成功率。
在第三方面的第三种可能的实现方式中，所述MSCS中设置有定时器，所述装置还包括：开启模块，配置为在所述发送模块向IMS发送SIP建立请求消息之后，开启所述定时器；所述发送模块，还配置为在所述定时器达到预设时间未接收到所述IMS发送的INFO消息时，向所述MME发送取消SRVCC切换通知消息。
根据第三方面的第四种可能的实现方式中，所述装置还包括：计算模块，配置为根据所述发送模块发送SRVCC切换完成通知消息的次数、所述接收模块接收SRVCC切换请求消息的次数，以及所述发送模块发送取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
第四方面，本公开实施例提供一种单信道连续业务的切换装置，所述装置设置于移动性管理实体MME中，所述装置包括：发送模块，配置为向移动交互中心服务器MSCS发送单信道连续业务SRVCC切换请求消息；接收模块，配置为接收所述MSCS发送的SRVCC切换完成通知消息，所述SRVCC切换完成通知消息为所述MSCS在接收到信息管理系统IMS发送的更新媒体消息和目标基 站发送的切换检测完成消息后，向所述MME发送的。
在第四方面的第一种可能的实现方式中，所述SRVCC切换请求消息中包括目标基站的标识信息，所述SRVCC切换请求消息用于指示所述MSCS根据所述目标基站的标识信息向所述目标基站发送切换检测请求消息，并接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
在第四方面的第二种可能的实现方式中，所述SRVCC切换请求消息中包括切换号码，所述SRVCC切换请求消息用于指示所述MSCS根据所述切换号码向所述IMS发送会话初始协议SIP建立请求消息。
在第四方面的第三种可能的实现方式中，所述装置还包括：计算模块，配置为根据所述接收模块接收SRVCC切换完成通知消息的次数和所述发送模块发送SRVCC切换请求消息的次数，计算SRVCC切换成功率。
在第四方面的第四种可能的实现方式中，所述接收模块，还配置为接收所述MSCS发送的取消SRVCC切换通知消息；所述装置还包括：计算模块，配置为根据所述接收模块接收SRVCC切换完成通知消息的次数、所述发送模块发送SRVCC切换请求消息的次数，以及所述接收模块接收取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
本公开实施例提供的单信道连续业务的切换方法和装置中，MSCS根据从MME获取的切换号码，向IMS发送SIP建立请求消息，随后，MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送SRVCC切换完成通知消息。也就是说，MSCS不需要等待IMS返回的INFO消息，就可以向MME发送上述SRVCC切换完成通知消息，避免了IMS长时间不返回INFO消息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切换取消消息以通知MSCS释放呼叫的现象，有利于提高SRVCC切换成功率；本公开实施例解决了相关技术中执行SRVCC切换的过程，可能由于IMS中网元处理消息不及时和兼容性等原因，而导致计算出的SRVCC切换成功率的指标较低的问题。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
附图用来提供对本公开的进一步理解，并且构成说明书的一部分，与本申请的实施例一起用于解释本公开，并不构成对本公开的限制。
图1为一种SRVCC的切换方法的应用场景示意图；
图2为相关技术中提供的一种SRVCC切换方法的信今交互流程图；
图3为相关技术中提供的另一种SRVCC切换方法的信今交互流程图；
图4为本公开实施例提供的一种SRVCC的切换方法的流程图；
图5为本公开实施例提供的另一种SRVCC的切换方法的流程图；
图6为本公开实施例提供的又一种SRVCC的切换方法的流程图；
图7为本公开实施例提供的再一种SRVCC的切换方法的流程图；
图8为本公开实施例提供的再一种SRVCC的切换方法的流程图；
图9为本公开实施例提供的再一种SRVCC的切换方法的流程图；
图10为本公开实施例提供的SRVCC的切换方法的一种信今交互流程图；
图11为本公开实施例提供的一种SRVCC的切换装置的结构示意图；
图12为本公开实施例提供的另一种SRVCC的切换装置的结构示意图；
图13为本公开实施例提供的又一种SRVCC的切换装置的结构示意图；
图14为本公开实施例提供的再一种SRVCC的切换装置的结构示意图；
图15为本公开实施例提供的再一种SRVCC的切换装置的结构示意图。
具体实施方式
下文中将结合附图对本公开的实施例进行详细说明。需要说明的是，本申请中的实施例及实施例中的特征可以相互任意组合。
在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以 以不同于此处的顺序执行所示出或描述的步骤。
第三代合作伙伴计划(3rd Generation Partnership Project，简称为：3GPP)中提出了SRVCC，用以解决使用VoLTE的场景下，初期面临的由于网络覆盖不全而导致的语音通话可能中断的问题，SRVCC主要解决当UE在LTE网络向2G/3G CS移动时，如何保证语音呼叫连续性的问题，即保证UE在IMS控制的网络电话(Voice over Internet Protocol，简称为：VoIP)语音和CS域语音之间的平滑切换。
图1为一种SRVCC的切换方法的应用场景示意图。在该应用场景中，UE从演进型基站(Evolved Node B，简称为：eNB)覆盖的4G网络移动到基站控制器(Base Station Controller，简称为：BSC)覆盖的2G网络下，MSCS在收到MME发送的SRVCC切换请求消息后，MSCS会与目标基站交换切换检测请求消息和切换检测响应消息，在目标基站上进行相关无线资源的分配；MSCS依据切换号码发起到IMS的SIP建立请求过程，同时目标基站进行切换检测过程，切换完成后给MSCS发切换检测完成消息，后续MSCS何时给MME发送SRVCC切换完成通知消息是影响SRVCC切换成功率的重要因素；图1中的IMS是指在IMS中锚定的网元，例如为：业务集中及连续应用服务器(Service Centralization and Continuity Application Server，简称为：SCC AS)、会话边界控制器(Session Border Controller，简称为：SBC)/接入传输控制功能(Acess Transfer Control Functionality，简称为：ATCF)或其它网元；图1中的SAE-GW为SAE网关(SAE Gateway)。如图2所示，为相关技术中提供的一种SRVCC切换方法的信今交互流程图，相关技术中执行SRVCC切换方法可以包括如下步骤S101～S113。
在步骤S101中，MSCS接收MME发送的SRVCC切换请求消息，该SRVCC切换请求消息中包括切换号码。
在步骤S102中，MSCS向目标基站发送切换检测请求消息。
在步骤S103中，目标基站向MSCS反馈切换检测响应消息，该切换检测响应消息用于指示目标基站可以进行相关资源的分配。
在步骤S104中，MSCS向MME发送SRVCC切换响应消息。
在步骤S105中，MSCS依据切换号码发起会话迁移过程，即向IMS发送 SIP建立请求消息。
需要说明的是，步骤S104和S105没有明确的先后顺序，可以依次执行，也可以同时执行。
在步骤S106中，MSCS接收IMS发送的更新媒体消息(即18X消息)，该更新媒体消息中标有IMS支持的INFO包。
在步骤S107中，目标基站进行切换检测后，目标基站子系统(Base Stataion Subsystem，简称为：BSS)向MSCS发送切换检测完成消息。
在步骤S108中，MSCS向目标基站返回切换检测完成响应消息。
在步骤S109中，MSCS向IMS发送PRACK消息，该PRACK消息是对步骤S106中更新媒体消息的确认请求消息。
需要说明的是，步骤S108和S109没有明确的先后顺序，可以依次执行，也可以同时执行。
在步骤S110中，IMS向MSCS返回200 OK消息，该200 OK消息是对步骤S106中更新媒体消息的响应消息。
在步骤S111中，MSCS接收IMS发送的INFO消息。
在步骤S112中，MSCS在接收到INFO消息后，向MME发送SRVCC切换完成通知消息；随后，MSCS计算出SRVCC切换成功率，该SRVCC切换成功率的计算公式为：P＝N/M*100％。
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，M表示SRVCC切换请求消息的次数。
在步骤S113中，MME向MSCS返回SRVCC完成通知响应消息。
在上述步骤S104～S111的过程中，MME一直在等MSCS发送的SRVCC切换完成通知消息，在此过程中，IMS侧返回消息不及，以及IMS侧不兼容等问题，都有可能会导致MME向MSCS发送SRVCC切换取消消息，使得SRVCC切换成功率降低。如图3所示，为相关技术中提供的另一种SRVCC切换方法的信今交互流程图，相关技术中执行SRVCC切换方法可以包括如下步骤S201～S211。
在具体实现中，图3所示流程中的步骤S201～S210可以参照图2所示流程中的步骤S101～S110，故在此不再赘述。
在步骤S211中，MME向MSCS发送SRVCC切换取消消息。
在图3所示流程中，由于MSCS长时间未接收到IMS侧发送的INFO消息，MME超时未接收到SRVCC切换完成通知消息后，会向MSCS发送SRVCC切换取消消息，从而导致切换失败，降低了SRVCC切换成功率。
如上所述，SRVCC切换过程中涉及的网元较多，并且各个消息的时序不好控制，特别是不同厂家对接的应用场景下，如何提高SRVCC切换成功率成为目前亟需解决的问题。
下面通过具体的实施例对本公开的技术方案进行详细说明，本公开涉及MME、MSCS、目标基站和IMS中的网元，其中，IMS中的网元为4G网络中的网元，MSCS和目标基站为2G/3G网络中的网元，MME分别与4G网络中的基站和网关，以及2G/3G网络中的MSCS进行消息交互(如图1所示)。本公开提供以下几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图4为本公开实施例提供的一种SRVCC的切换方法的流程图。本实施例提供的SRVCC的切换方法适用于UE从4G网络移动到2G/3G网络时进行SRVCC切换的情况中，该方法可以由SRVCC的切换装置执行，该SRVCC的切换装置通过硬件和软件结合的方式来实现，该装置可以集成在MSCS的处理器中，供处理器调用使用。如图4所示，本实施例的方法可以包括以下描述的步骤。
在步骤S410中，MSCS根据从MME中获取的切换号码，向IMS发送SIP建立请求消息。
本公开实施例提供的SRVCC的切换方法，为一种解决UE从4G网络移动到2G/3G网络时，在执行SRVCC切换的过程中，如何提高SRVCC切换成功率的方式。本公开实施例提供的方法的应用场景同样可以如图1所示，由于MME配置为执行UE可达性管理，当UE从4G网络移动到2G/3G网络时，MME向MSCS发送SRVCC切换请求消息，并且在该消息中携带待进行SRVCC切换的切换号码，因此，MSCS可以根据从MME获取的切换号码，向IMS发送SIP建立请求消息。
需要说明的是，本公开实施例中的IMS是指UE移动到2G/3G网络，并且建立C/S分支后，在IMS中锚定的网元，例如是SCC AS、SBC/ATCF或其它网元，并不是指IMS的整个系统。
在步骤S420中，MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送SRVCC切换完成通知消息。
在本公开实施例中，MSCS向MME发送SRVCC切换完成通知消息的时机，与相关技术中MSCS发送SRVCC切换完成通知消息的时机不同，具体的，MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，可以立即向MME发送上述SRVCC切换完成通知消息。本公开实施例提供的方法，MSCS不需要等待IMS侧返回的INFO消息，就可以直接向MME发送SRVCC切换完成通知消息，从而避免了MSCS在发送完SIP建立请求消息后，IMS长时间不返回INFO消息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切换取消消息以通知MSCS释放呼叫的现象。
需要说明的是，上述更新媒体消息为18X消息，可以包括180、181、182和183等，例如，180表示振铃，183表示回话进行时；上述INFO消息为发送通常与会议有关的应用层的可选信息。
上述背景技术中已经说明，相关技术中执行SRVCC切换的过程中，MSCS在收到MME发送的SRVCC切换请求消息后，MSCS会首先与目标基站交换切换检测请求消息和切换检测响应消息，交换完成后，MSCS可以同时与MME和IMS进行交互，向MME发SRVCC切换响应消息并向IMS发送SIP建立请求消息，随后，MSCS会等待目标基站返回的切换检测完成消息和IMS返回的18X消息以及INFO消息；然而，由于网络部署过程中不同厂家对接消息时序问题，存在MSCS等待IMS发送的INFO消息过程中，MME在长时间未接收到MSCS发送的SRVCC切换完成通知消息后主动发SRVCC切换取消消息给MSCS，通知MSCS释放呼叫。相比于相关技术中执行SRVCC切换的方法，本公开实施例提供的SRVCC的切换方法中，MSCS不需要等待IMS返回的INFO消息，只要接收到IMS发送的18X消息和目标基站发送的切换检测完成消息，就可以向MME发送SRVCC切换完成通知消息；可以看出，本公开实施例提供的方法，通过优化MSCS侧的切换流程，即使IMS返回INFO消息的时间较长也不会影 响切换流程的提前取消，达到了可以保证MME不会提前超时，从而保证切换流程的顺利完成，并且提高了SRVCC切换成功率，相应地，增强了运营商对MSCS产品的用户体验效果。
本实施例所提供的SRVCC的切换方法，通过MSCS根据从MME获取的切换号码，向IMS发送SIP建立请求消息，随后，MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送SRVCC切换完成通知消息，也就是说，MSCS不需要等待IMS返回的INFO消息，就可以向MME发送上述SRVCC切换完成通知消息，避免了IMS长时间不返回INFO消息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切换取消消息以通知MSCS释放呼叫的现象，有利于提高SRVCC切换成功率。本实施例提供的方法，解决了相关技术中执行SRVCC切换的过程，可能由于IMS中网元处理消息不及时和兼容性等原因，而导致计算出的SRVCC切换成功率的指标较低的问题。
在一实施例中，图5为本公开实施例提供的另一种SRVCC的切换方法的流程图。在图4所示实施例的基础上，本公开实施例提供的方法在步骤S410之前，还可以包括以下步骤S400和S402。
在步骤S400中，MSCS接收MME发送的SRVCC切换请求消息，该SRVCC切换请求消息中包括切换号码和目标基站的标识信息。
在步骤S401中，MSCS根据目标基站的标识信息向目标基站发送切换检测请求消息。
在步骤S402中，MSCS接收目标基站发送的切换检测响应消息，该切换检测响应消息用于指示该目标基站具有分配无线资源的能力。
在本公开实施例中，上述已经说明MSCS根据从MME中获取的切换号码发送SIP建立请求消息，在实际应用中，MSCS获取切换号码和无线资源的方式为：UE从4G网络移动到2G/3G网络中时，MME根据UE的移动确认目标基站，并且向MSCS发送携带切换号码和目标基站的标识信息的SRVCC切换请求消息，随后，MSCS根据获取的消息与目标基站进行切换检测请求消息和切换检测响应消息的交互，并从切换检测响应消息中获知目标基站可以进行无线资源的分配，即具有切换能力。另外，MSCS根据从步骤S400中获取的切换号 码发起回话迁移过程，即向IMS发送SIP建立请求消息。
在一实施例中，本公开实施例提供的方法在步骤S420之后，还可以包括：步骤S430，MSCS根据发送SRVCC切换完成通知消息的次数和接收SRVCC切换请求消息的次数，计算SRVCC切换成功率。
上述已经说明，SRVCC切换成功率的计算公式为：P＝N/M*100％。
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，M表示SRVCC切换请求消息的次数。
需要说明的是，本公开实施例提供的方法中，上述步骤S400～S420可以是重复执行的，只要满足UE从4G网络移动到2G/3G网络的条件，就执行步骤S400～S420。因此，MSCS可以在某一预设的时间段内，根据发送SRVCC切换完成通知消息的次数和接收SRVCC切换请求消息的次数，计算出该时间段内SRVCC切换成功率。
由于本公开实施例提供的方法，MSCS不需要等待IMS返回的INFO消息，就可以向MME发送SRVCC切换完成通知消息，这样，在一定程度上提高了SRVCC切换成功率。
需要说明的是，从外场某个商用环境统计发现，相关技术中执行SRVCC切换的过程中，由于IMS返回INFO消息的时长较长，而导致SRVCC切换成功率下降20％左右，实际上不同的商用环境中该数据相差还比较大。因此，本公开实施例提供的方法中，通过合理的优化SRVCC切换流程对SRVCC切换成功率有一定的提升。
在一实施例中，本公开实施例中的MSCS中可以设置有定时器，如图6所示，为本公开实施例提供的又一种SRVCC的切换方法的流程图。在图5所示实施例的基础上，本公开实施例提供的方法在S110之后，还可以包括：步骤S411，MSCS开启定时器。
在步骤S420之后，该方法还可以包括：步骤S421，在该定时器达到预设时间而未接收到IMS发送的INFO消息时，向MME发送取消SRVCC切换通知消息。
在本公开实施例中，可以在MSCS侧预留一定的时间等待IMS返回的INFO 消息，即可以通过在MSCS中设置定时器的方式，MSCS发送SIP建立请求消息之后，就开启该定时器，以等待后续IMS返回的INFO消息，若在预设时间内尚未接收到INFO消息时，MSCS可以主动向MME发送取消SRVCC切换通知消息，以释放当前呼叫。
在本实施例中，MSCS计算SRVCC切换成功率的方式，即步骤S430的实现方式可以为：MSCS根据发送SRVCC切换完成通知消息的次数、接收SRVCC切换请求消息的次数和发送取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。在实际应用中，SRVCC切换成功率的计算公式可以为：
P＝(N-K)/M*100％
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，K表示取消SRVCC切换通知消息的次数，M表示SRVCC切换请求消息的次数。
由上述计算SRVCC切换成功率的公式可以看出，虽然MSCS主动释放当前呼叫的方式，会降低计算出的SRVCC切换成功率的指标，但可知此时成功率较低的现象是由于IMS网元兼容性问题不发送INFO消息造成的，因此，不会影响MSCS侧的SRVCC切换成功率指标。本公开实施例通过合理的优化SRVCC切换流程，可以增强网元的兼容性，有效的提高了SRVCC切换成功率，从而达到运维要求。
在本公开实施例中，上述图5和图6所示SRVCC的切换方法在步骤S402之后，还可以包括：MSCS向MME发送SRVCC切换响应消息。需要说明的是，本公开实施例不限制MSCS发送SRVCC切换响应消息和发送SIP建立请求消息的先后顺序。
在本公开实施例中，上述图5和图6所示SRVCC的切换方法在步骤S420之前，还可以包括：MSCS接收IMS发送的18X消息，MSCS接收目标基站发送的切换检测完成消息。需要说明的是，本公开实施例不限制MSCS接收18X消息和切换检测完成消息的先后顺序。
另外，MSCS接收切换检测完成消息之后，还可以包括：MSCS向目标基站发送切换检测完成响应消息，MSCS向IMS发送PRACK消息，MSCS接收IMS发送的200 OK消息，MSCS接收IMS发送的INFO消息。需要说明的是，本公开实施例不限制MSCS发送切换检测完成响应消息，发送PRACK消息，以及 接收INFO消息的先后顺序。
在本公开实施例中，上述图5和图6所示SRVCC的切换方法在步骤S420之后，还可以包括：MSCS接收MME返回的SRVCC切换完成通知响应消息，随后结束切换流程。
图7为本公开实施例提供的再一种SRVCC的切换方法的流程图。本实施例提供的SRVCC的切换方法适用于UE从4G网络移动到2G/3G网络时进行SRVCC切换的情况中。该方法可以由SRVCC的切换装置执行，该SRVCC的切换装置通过硬件和软件结合的方式来实现，该装置可以集成在MME的处理器中，供处理器调用使用。如图7所示，本实施例的方法可以包括以下描述的步骤S510和S520。
在步骤S510中，MME向MSCS发送SRVCC切换请求消息。
本公开实施例提供的SRVCC的切换方法，为一种解决UE从4G网络移动到2G/3G网络时，在执行SRVCC切换的过程中，如何提高SRVCC切换成功率的方式。本公开实施例提供的方法的应用场景同样可以如图1所示，由于MME用于执行UE可达性管理，当UE从4G网络移动到2G/3G网络时，MME可以向MSCS发送SRVCC切换请求消息，并且在该消息中携带待进行SRVCC切换的切换号码，因此，MSCS可以根据从MME获取的切换号码，向IMS发送SIP建立请求消息。
在步骤S520中，MME接收MSCS发送的SRVCC切换完成通知消息，该SRVCC切换完成通知消息为MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送的。
在本公开实施例中，MSCS向MME发送SRVCC切换完成通知消息的时机，与相关技术中MSCS发送SRVCC切换完成通知消的时机不同，具体地，MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，可以立即向MME发送上述SRVCC切换完成通知消息。本公开实施例提供的方法，MSCS不需要等待IMS侧返回的INFO消息，就可以直接向MME发送SRVCC切换完成通知消息，MME可以在较短时间内接收到SRVCC切换完成通知消息，从而避免了MSCS在发送完SIP建立请求消息后，IMS长时间不返回INFO消 息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切换取消消息以通知MSCS释放呼叫的现象。
需要说明的是，本公开实施例中的IMS是指UE移动到2G/3G网络，并且建立C/S分支后，在IMS中锚定的网元，例如是SCC AS、SBC/ATCF或其它网元，并不是指IMS的整个系统。另外，上述更新媒体消息为18X消息，可以包括180、181、182和183等，例如，180表示振铃，183表示回话进行时。上述INFO消息为发送通常与会议有关的应用层的可选信息。
上述背景技术中已经说明，相关技术中执行SRVCC切换的过程中，MSCS在收到MME发送的SRVCC切换请求消息后，MSCS会首先与目标基站交换切换检测请求消息和切换检测响应消息，交换完成后，MSCS可以同时与MME和IMS进行交互，向MME发SRVCC切换响应消息并向IMS发送SIP建立请求消息，随后，MSCS会等待目标基站返回的切换检测完成消息和IMS返回的18X消息以及INFO消息。然而，由于网络部署过程中不同厂家对接消息时序问题，存在MSCS等待IMS发送的INFO消息过程中，MME在长时间未接收到MSCS发送的SRVCC切换完成通知消息后主动发SRVCC切换取消消息给MSCS，通知MSCS释放呼叫。相比于相关技术中执行SRVCC切换的方法，本公开实施例提供的SRVCC的切换方法中，MSCS不需要等待IMS返回的INFO消息，只要接收到IMS发送的18X消息和目标基站发送的切换检测完成消息，就可以向MME发送SRVCC切换完成通知消息。可以看出，本公开实施例提供的方法，通过优化MSCS侧的切换流程，即使IMS返回INFO消息的时间较长也不会影响切换流程的提前取消，由此可以保证MME不会提前超时，从而保证切换流程的顺利完成，并且提高了SRVCC切换成功率，相应地，增强了运营商对MSCS产品的用户体验效果。
在本实施例所提供的SRVCC的切换方法中，MME向MSCS发送SRVCC切换请求消息，并且接收MSCS发送的SRVCC切换完成通知消息，其中，该SRVCC切换完成通知消息为所述MSCS在接收到信息管理系统IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向所述MME发送的。也就是说，MSCS不需要等待IMS返回的INFO消息，就可以向MME发送上述SRVCC切换完成通知消息，避免了IMS长时间不返回INFO消息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切 换取消消息以通知MSCS释放呼叫的现象，有利于提高SRVCC切换成功率。本实施例提供的方法，解决了相关技术中执行SRVCC切换的过程，可能由于IMS中网元处理消息不及时和兼容性等原因，而导致计算出的SRVCC切换成功率的指标较低的问题。
在本公开实施例中，步骤S510中MME发送的SRVCC切换请求消息中包括目标基站的标识信息，该SRVCC切换请求消息用于指示MSCS根据目标基站的标识信息向该目标基站发送切换检测请求消息，并接收该目标基站发送的切换检测响应消息，该切换检测响应消息用于指示目标基站具有分配无线资源的能力。也就是说，MSCS通过接收SRVCC切换请求消息获取到目标基站的标识信息后，可以根据该目标基站的标识信息与该目标基站交互切换检测请求消息和切换检测响应消息，并从切换检测响应消息中获知基站可以进行无线资源的分配，即具有切换能力。
在本公开实施例中，步骤S410中MME发送的SRVCC切换请求消息中还可以包括切换号码。该SRVCC切换请求消息还用于指示MSCS根据该切换号码向IMS发送会话初始协议SIP建立请求消息。也就是说，MSCS通过接收SRVCC切换请求消息获取到切换号码后，可以根据该切换号码向IMS发送SIP建立请求消息。在实际应用中，MSCS获取切换号码和无线资源的方式为：UE从4G网络移动到2G/3G网络中时，MME根据UE的移动确认目标基站，并且向MSCS发送携带切换号码和目标基站的标识信息的SRVCC切换请求消息，随后，MSCS根据获取的消息与目标基站进行切换检测请求消息和切换检测响应消息的交互，并从切换检测响应消息中获取目标基站为切换号码分配的无线资源。另外，MSCS根据从SRVCC切换请求消息中获取的切换号码发起回话迁移过程，即向IMS发送SIP建立请求消息。
在一实施例中，图8为本公开实施例提供的再一种SRVCC的切换方法的流程图。在图7所示实施例的基础上，本公开实施例提供的方法在步骤S520之后，还可以包括：步骤S530，MME根据接收SRVCC切换完成通知消息的次数和发送SRVCC切换请求消息的次数，计算SRVCC切换成功率。
上述实施例中已经说明，SRVCC切换成功率的计算公式为：P＝N/M*100％。
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，M表示SRVCC切换请求消息的次数。
需要说明的是，本公开实施例提供的方法中，上述步骤S510～S520和MSCS侧执行的步骤可以是重复执行的，只要满足UE从4G网络移动到2G/3G网络的条件，MME就执行步骤S510～S520，并且MSCS执行相应的步骤。因此，MME可以在某一预设的时间段内，根据接收SRVCC切换完成通知消息的次数和发送SRVCC切换请求消息的次数，计算出该时间段内SRVCC切换成功率。
由于本公开实施例提供的方法，MSCS不需要等待IMS返回的INFO消息，就可以向MME发送SRVCC切换完成通知消息，这样，在一定程度上提高了SRVCC切换成功率。
需要说明的是，从外场某个商用环境统计发现，相关技术中执行SRVCC切换的过程中，由于IMS返回INFO消息的时长较长，而导致SRVCC切换成功率下降20％左右，实际上不同的商用环境中该数据相差还比较大。因此，本公开实施例提供的方法中，通过合理的优化SRVCC切换流程的于SRVCC切换成功率有一定的提升。
在一实施例中，如图9所示，为本公开实施例提供的再一种SRVCC的切换方法的流程图。在图7所示实施例的基础上，本公开实施例提供的方法在步骤S520之后，还可以包括：步骤S540，MME接收MSCS发送的取消SRVCC切换通知消息。
在本公开实施例中，可以在MSCS侧预留一定的时间等待IMS返回的INFO消息，即可以通过在MSCS中设置有定时器的方式，在MSCS向IMS发送SIP建立请求消息之后，就开启该定时器，以等待后续IMS返回的INFO消息，若在预设时间内尚未接收到INFO消息时，MSCS可以主动向MME发送取消SRVCC切换通知消息，以释放当前呼叫。因此，本公开实施例中的MME在接收到SRVCC切换完成通知消息后，还可以接收到用于释放当前呼叫的取消SRVCC切换通知消息。
在一实施例中，本实施例提供的方法还可以包括：步骤S550，MME根据接收SRVCC切换完成通知消息的次数、发送SRVCC切换请求消息的次数和接收取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
在实际应用中，SRVCC切换成功率的计算公式可以为：
P*＝(N-K)/M*100％
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，K表示取消SRVCC切换通知消息的次数，M表示SRVCC切换请求消息的次数。
由上述计算SRVCC切换成功率的公式可以看出，虽然MSCS主动释放当前呼叫的方式，会降低计算出的SRVCC切换成功率的指标，但可知此时成功率较低的现象是由于IMS网元兼容性问题不发送INFO消息造成的，因此，不会影响MSCS侧的SRVCC切换成功率指标。本公开实施例通过合理的优化SRVCC切换流程，可以增强网元的兼容性，有效的提高了SRVCC切换成功率，从而达到运维要求。
在本公开实施例中，上述图8和图9所示SRVCC的切换方法在MME向MSCS发送SRVCC切换请求消息之后，还可以包括MSCS与目标基站、IMS和MME之间进行交互的操作，该些操作在上述以MSCS为执行主体的实施例中已经详细说明，故在此不再赘述。
图10为本公开实施例提供的SRVCC的切换方法的一种信今交互流程图。图9所示SRVCC的切换方法可以包括如下描述的步骤。
在步骤S301中，MSCS接收MME发送的SRVCC切换请求消息，该SRVCC切换请求消息中包括切换号码和目标基站的标识信息。
在步骤S302中，MSCS根据目标基站的标识信息向该目标基站发送切换检测请求消息。
在步骤S303中，目标基站向MSCS反馈切换检测响应消息，该切换检测响应消息用于指示目标基站可以进行相关资源的分配，具有切换能力。
在步骤S304中，MSCS向MME发送SRVCC切换响应消息。
在步骤S305中，MSCS依据切换号码发起会话迁移过程，即向IMS发送SIP建立请求消息。
需要说明的是，本实施例中步骤S304和S305没有明确的先后顺序，可以 依次执行，也可以同时执行。
在步骤S306中，MSCS接收IMS发送的18X消息，该18X消息中标有IMS支持的INFO包。
在S307中，目标基站进行切换检测后，目标BSS向MSCS发送切换检测完成消息。
需要说明的是，本实施例中步骤S306和S307没有明确的先后顺序，可以依次执行，也可以同时执行。
在步骤S308中，MSCS向MME发送SRVCC切换完成通知消息；随后，MSCS即可计算SRVCC切换成功率，SRVCC切换成功率的计算方式上述实施例中已经详细说明，故在此不再赘述。
本公开实施例提供的方法中，MSCS在接收到18X消息和切换检测完成消息后，即可以直接发送SRVCC切换完成通知消息。也就是说，MSCS不受IMS中网元消息时序的限制，不需要一直等待IMS的INFO消息，这样可以很大程度上提高SRVCC切换成功率。
在步骤S309中，MSCS向目标基站返回切换检测完成响应消息。
在步骤S310中，MME向MSCS返回SRVCC完成通知响应消息。
在步骤S311中，MSCS向IMS发送PRACK消息，该PRACK消息是对步骤S306中18X消息的确认请求消息。
在步骤S312中，IMS向MSCS返回200 OK消息，该200 OK消息是对步骤S306中18X消息的响应消息。
在步骤S313中，MSCS接收IMS发送的INFO消息；MSCS在接收到IMS返回的INFO消息后，可以正常处理当前呼叫，即建立SRVCC业务。
需要说明的是，本实施例中步骤S308、S309和S313没有明确的先后顺序，可以依次执行，也可以同时执行。
图11为本公开实施例提供的一种SRVCC的切换装置的结构示意图。本实施例提供的SRVCC的切换装置适用于UE从4G网络移动到2G/3G网络时进行 SRVCC切换的情况中，该SRVCC的切换装置通过硬件和软件结合的方式来实现，该装置可以集成在MSCS的处理器中，供处理器调用使用。如图11所示，本实施例的SRVCC的切换装置可以包括：发送模块11和接收模块12。
发送模块11配置为根据从MME中获取的切换号码，向IMS发送SIP建立请求消息。
本公开实施例提供的SRVCC的切换装置，解决UE从4G网络移动到2G/3G网络时，在执行SRVCC切换的过程中，如何提高SRVCC切换成功率的问题。本公开实施例提供的装置的应用场景同样可以如图1所示，由于MME用于执行UE可达性管理，当UE从4G网络移动到2G/3G网络时，MME向MSCS发送SRVCC切换请求消息，并且在该消息中携带待进行SRVCC切换的切换号码。因此，发送模块11可以根据从MME获取的切换号码，向IMS发送SIP建立请求消息。
需要说明的是，本公开实施例中的IMS是指UE移动到2G/3G网络，并且建立C/S分支后，在IMS中锚定的网元，例如是SCC AS、SBC/ATCF或其它网元，并不是指IMS的整个系统。
接收模块12配置为接收IMS发送的更新媒体消息和目标基站发送的切换检测完成消息。
发送模块11还配置为在接收模块12接收到更新媒体消息和切换检测完成消息后，向MME发送SRVCC切换完成通知消息。
在本公开实施例中，发送模块11向MME发送SRVCC切换完成通知消息的时机，与相关技术中MSCS发送SRVCC切换完成通知消的时机不同。具体的，在接收模块12接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，发送模块11可以立即向MME发送上述SRVCC切换完成通知消息。本公开实施例提供的装置，MSCS不需要等待IMS侧返回的INFO消息，发送模块11就可以直接向MME发送SRVCC切换完成通知消息，从而避免了发送模块11在发送完SIP建立请求消息后，IMS长时间不返回INFO消息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切换取消消息以通知MSCS释放呼叫的现象。
需要说明的是，上述更新媒体消息为18X消息，可以包括180、181、182 和183等，例如，180表示振铃，183表示回话进行时。上述INFO消息为发送通常与会议有关的应用层的可选信息。
上述实施例中已经说明相关技术执行SRVCC切换的过程中存在的缺点和问题，故在此不再赘述。相比于相关技术中执行SRVCC切换的技术方案，本公开实施例提供的SRVCC的切换装置在执行切换的过程中，MSCS不需要等待IMS返回的INFO消息，只要接收到IMS发送的18X消息和目标基站发送的切换检测完成消息，就可以向MME发送SRVCC切换完成通知消息。可以看出，本公开实施例提供的装置，通过优化MSCS侧的切换流程，即使IMS返回INFO消息的时间较长也不会影响切换流程的提前取消，达到了可以保证MME不会提前超时，从而保证切换流程的顺利完成，并且提高了SRVCC切换成功率，相应地，增强了运营商对MSCS产品的用户体验效果。
公开实施例提供的SRVCC的切换装置配置为执行本公开图4所示实施例提供的SRVCC的切换方法，具备相应的功能模块，其实现原理和技术效果类似，此处不再赘述。
在本公开的一个实施例中，接收模块12还配置为在发送模块11向IMS发送SIP建立请求消息之前，接收MME发送的SRVCC切换请求消息，该SRVCC切换请求消息中包括切换号码和目标基站的标识信息；发送模块11还配置为根据接收模块12接收的目标基站的标识信息向该目标基站发送切换检测请求消息；接收模块12还配置为接收目标基站发送的切换检测响应消息，该切换检测响应消息用于指示目标基站具有分配无线资源的能力。
在本公开实施例中，上述已经说明发送模块11根据从MME中获取的切换号码发送SIP建立请求消息。在实际应用中，MSCS获取切换号码和无线资源的方式为：UE从4G网络移动到2G/3G网络中时，MME根据UE的移动确认目标基站，并且向MSCS发送携带切换号码和目标基站的标识信息的SRVCC切换请求消息，随后，MSCS根据获取的消息与目标基站进行切换检测请求消息和切换检测响应消息的交互，并从切换检测响应消息中获知目标基站可以进行无线资源的分配，即具有切换能力。另外，MSCS根据从获取的切换号码发起回话迁移过程，即向IMS发送SIP建立请求消息。
在一实施例中，如图12所示为本公开实施例提供的另一种SRVCC的切换 装置的结构示意图。在图11所述装置的结构基础上，本实施例提供的装置还可以包括：计算模块13，配置为根据发送模块11发送SRVCC切换完成通知消息的次数和接收模块12接收SRVCC切换请求消息的次数，计算SRVCC切换成功率。
上述已经说明，SRVCC切换成功率的计算公式为：P＝N/M*100％。
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，M表示SRVCC切换请求消息的次数。
需要说明的是，本公开实施例提供的装置中，上述发送模块11和接收模块12执行的操作可以是重复执行的，只要满足UE从4G网络移动到2G/3G网络的条件，就执行上述操作。因此，计算模块13可以在某一预设的时间段内，根据发送SRVCC切换完成通知消息的次数和接收SRVCC切换请求消息的次数，计算出该时间段内SRVCC切换成功率。
公开实施例提供的SRVCC的切换装置配置为执行本公开图5所示实施例提供的SRVCC的切换方法，具备相应的功能模块，其实现原理和技术效果类似，此处不再赘述。
在一实施例中，如图13所示为本公开实施例提供的又一种SRVCC的切换装置的结构示意图。在图11所述装置的结构基础上，本实施例的MSCS中可以设置有定时器，本实施例提供的装置还可以包括：开启模块14，配置为在发送模块11向IMS发送SIP建立请求消息之后，开启定时器；发送模块11还配置为在定时器达到预设时间未接收到IMS发送的INFO消息时，向MME发送取消SRVCC切换通知消息。
在本公开实施例中，可以在MSCS侧预留一定的时间等待IMS返回的INFO消息，即可以通过在MSCS中设置定时器的方式，发送模块11发送SIP建立请求消息之后，就开启该定时器，以等待后续IMS返回的INFO消息，若在预设时间内尚未接收到INFO消息时，发送模块11可以主动向MME发送取消SRVCC切换通知消息，以释放当前呼叫。
本实施例提供的装置同样可以包括：计算模块13。
该计算模块13计算SRVCC切换成功率的方式可以为：根据发送模块11发 送SRVCC切换完成通知消息的次数、接收模块12接收SRVCC切换请求消息的次数，以及发送模块11发送取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。在实际应用中，SRVCC切换成功率的计算公式可以为：P＝(N-K)/M*100％。
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，K表示取消SRVCC切换通知消息的次数，M表示SRVCC切换请求消息的次数。
由上述计算SRVCC切换成功率的公式可以看出，虽然MSCS主动释放当前呼叫的方式，会降低计算出的SRVCC切换成功率的指标，但可知此时成功率较低的现象是由于IMS网元兼容性问题不发送INFO消息造成的，因此，不会影响MSCS侧的SRVCC切换成功率指标。本公开实施例通过合理的优化SRVCC切换流程，可以增强网元的兼容性，有效的提高了SRVCC切换成功率，从而达到运维要求。
公开实施例提供的SRVCC的切换装置配置为执行本公开图6所示实施例提供的SRVCC的切换方法，具备相应的功能模块，其实现原理和技术效果类似，此处不再赘述。
在实际应用中，本公开图11到图13所示各实施例中的发送模块11和接收模块12可以通过MSCS的收发器来实现。计算模块13和开启模块14可以通过MSCS的处理器来实现，该处理器例如可以是一个中央处理器(Central Processing Unit，简称为：CPU)，或者是特定集成电路(Application Specific Integrated Circuit，简称为：ASIC)，或者是完成实施本公开实施例的一个或多个集成电路。
图14为本公开实施例提供的再一种SRVCC的切换装置的结构示意图。本实施例提供的SRVCC的切换装置适用于UE从4G网络移动到2G/3G网络时进行SRVCC切换的情况中，该SRVCC的切换装置通过硬件和软件结合的方式来实现，该装置可以集成在MME的处理器中，供处理器调用使用。如图14所示，本实施例的SRVCC的切换装置可以包括：发送模块21和接收模块22。
发送模块21配置为向MSCS发送SRVCC切换请求消息。
本公开实施例提供的SRVCC的切换装置，为一种解决UE从4G网络移动 到2G/3G网络时，在执行SRVCC切换的过程中，如何提高SRVCC切换成功率的方式。本公开实施例提供的装置的应用场景同样可以如图1所示，由于MME用于执行UE可达性管理，当UE从4G网络移动到2G/3G网络时，MME的发送模块21可以向MSCS发送SRVCC切换请求消息，并且在该消息中携带待进行SRVCC切换的切换号码。因此，MSCS可以根据从MME获取的切换号码，向IMS发送SIP建立请求消息。
接收模块22配置为接收MSCS发送的SRVCC切换完成通知消息，该SRVCC切换完成通知消息为MSCS在接收到信息管理系统IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送的。
在本公开实施例中，MSCS向MME发送SRVCC切换完成通知消息的时机，与相关技术中MSCS发送SRVCC切换完成通知消的时机不同。具体地，MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，可以立即向MME发送上述SRVCC切换完成通知消息。本公开实施例提供的装置中，MSCS不需要等待IMS侧返回的INFO消息，就可以直接向MME发送SRVCC切换完成通知消息，MME的接收模块22可以在较短时间内接收到SRVCC切换完成通知消息，从而避免了MSCS在发送完SIP建立请求消息后，IMS长时间不返回INFO消息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切换取消消息以通知MSCS释放呼叫的现象。
需要说明的是，本公开实施例中的IMS是指UE移动到2G/3G网络，并且建立C/S分支后，在IMS中锚定的网元，例如是SCC AS、SBC/ATCF或其它网元，并不是指IMS的整个系统。另外，上述更新媒体消息为18X消息，可以包括180、181、182和183等，例如，180表示振铃，183表示回话进行时。上述INFO消息为发送通常与会议有关的应用层的可选信息。
上述实施例中已经说明相关技术执行SRVCC切换的过程中存在的缺点和问题，故在此不再赘述。相比于相关技术中执行SRVCC切换的技术方案，本公开实施例提供的SRVCC的切换装置在执行切换的过程中，MSCS不需要等待IMS返回的INFO消息，只要接收到IMS发送的18X消息和目标基站发送的切换检测完成消息，就可以向MME发送SRVCC切换完成通知消息。可以看出， 本公开实施例提供的技术方案，通过优化MSCS侧的切换流程，即使IMS返回INFO消息的时间较长也不会影响切换流程的提前取消，达到了可以保证MME不会提前超时，从而保证切换流程的顺利完成，并且提高了SRVCC切换成功率，相应地，增强了运营商对MSCS产品的用户体验效果。
本公开实施例提供的SRVCC的切换装置配置为执行本公开图7所示实施例提供的SRVCC的切换方法，具备相应的功能模块，其实现原理和技术效果类似，此处不再赘述。
在本公开实施例中，发送模块21发送的SRVCC切换请求消息中包括目标基站的标识信息，该SRVCC切换请求消息用于指示MSCS根据目标基站的标识信息向该目标基站发送切换检测请求消息，并接收该目标基站发送的切换检测响应消息，该切换检测响应消息用于指示目标基站具有分配无线资源的能力。也就是说，MSCS通过接收SRVCC切换请求消息获取到目标基站的标识信息后，可以根据该目标基站的标识信息与该目标基站交互切换检测请求消息和切换检测响应消息，并从切换检测响应消息中获知基站可以进行无线资源的分配，即具有切换能力。
在本公开实施例中，发送模块21发送的SRVCC切换请求消息中还可以包括切换号码，该SRVCC切换请求消息还用于指示MSCS根据该切换号码向IMS发送会话初始协议SIP建立请求消息。也就是说，MSCS通过接收SRVCC切换请求消息获取到切换号码后，可以根据该切换号码向IMS发送SIP建立请求消息。在实际应用中，MSCS获取切换号码和无线资源的方式为：UE从4G网络移动到2G/3G网络中时，MME根据UE的移动确认目标基站，并且向MSCS发送携带切换号码和目标基站的标识信息的SRVCC切换请求消息，随后，MSCS根据获取的消息与目标基站进行切换检测请求消息和切换检测响应消息的交互，并从切换检测响应消息中获取目标基站为切换号码分配的无线资源。另外，MSCS根据从SRVCC切换请求消息中获取的切换号码发起回话迁移过程，即向IMS发送SIP建立请求消息。
在一实施例中，图15为本公开实施例提供的再一种SRVCC的切换装置的结构示意图。在图14所示装置的结构基础上，本实施例提供的装置还可以包括：计算模块23，配置为根据接收模块22接收SRVCC切换完成通知消息的次数和 发送模块21发送SRVCC切换请求消息的次数，计算SRVCC切换成功率。
上述实施例中已经说明，SRVCC切换成功率的计算公式为：
P＝N/M*100％。
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，M表示SRVCC切换请求消息的次数。
需要说明的是，本公开实施例提供的装置中，上述发送模块21和接收模块22执行的各操作和MSCS侧执行的操作可以是重复执行的。只要满足UE从4G网络移动到2G/3G网络的条件，发送模块21和接收模块22就执行上述各操作，并且MSCS执行相应的操作。因此，MME的计算模块23可以在某一预设的时间段内，根据接收SRVCC切换完成通知消息的次数和发送SRVCC切换请求消息的次数，计算出该时间段内SRVCC切换成功率。
由于本公开实施例提供的技术方案中，MSCS不需要等待IMS返回的INFO消息，就可以向MME发送SRVCC切换完成通知消息，这样，在一定程度上提高了SRVCC切换成功率。
本公开实施例提供的SRVCC的切换装置配置为执行本公开图8所示实施例提供的SRVCC的切换方法，具备相应的功能模块，其实现原理和技术效果类似，此处不再赘述。
在一实施例中，图15所示SRVCC的切换装置中，接收模块22还配置为接收MSCS发送的取消SRVCC切换通知消息；计算模块23还配置为根据接收模块22接收SRVCC切换完成通知消息的次数、发送模块21发送SRVCC切换请求消息的次数，以及接收模块22接收取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
在本公开实施例中，同样可以在MSCS侧预留一定的时间等待IMS返回的INFO消息，即可以通过在MSCS中设置有定时器的方式，在MSCS向IMS发送SIP建立请求消息之后，就开启该定时器，以等待后续IMS返回的INFO消息，若在预设时间内尚未接收到INFO消息时，MSCS可以主动向MME发送取消SRVCC切换通知消息，以释放当前呼叫。因此，本公开实施例中，MME的接收模块22在接收到SRVCC切换完成通知消息后，还可以接收到用于释放当 前呼叫的取消SRVCC切换通知消息。
本实施例中计算模块23计算SRVCC切换成功率的公式同样可以为：
P＝(N-K)/M*100％
这里P表示SRVCC切换成功率，N表示SRVCC切换完成通知消息的次数，K表示取消SRVCC切换通知消息的次数，M表示SRVCC切换请求消息的次数。
由上述计算SRVCC切换成功率的公式可以看出，虽然MSCS主动释放当前呼叫的方式，会降低计算出的SRVCC切换成功率的指标，但可知此时成功率较低的现象是由于IMS网元兼容性问题不发送INFO消息造成的，因此，不会影响MSCS侧的SRVCC切换成功率指标。本公开实施例通过合理的优化SRVCC切换流程，可以增强网元的兼容性，有效的提高了SRVCC切换成功率，从而达到运维要求。
本公开实施例提供的SRVCC的切换装置配置为执行本公开图9所示实施例提供的SRVCC的切换方法，具备相应的功能模块，其实现原理和技术效果类似，此处不再赘述。
在实际应用中，本公开图14到图15所示各实施例中的发送模块21和接收模块22可以通过MSCS的收发器来实现，计算模块23可以通过MSCS的处理器来实现，该处理器例如可以是一个CPU，或者是ASIC，或者是完成实施本公开实施例的一个或多个集成电路。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可以通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。在一实施例中，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序/指令来实现其相应功能。
虽然本公开所揭露的实施方式如上，但所述的内容仅为便于理解本公开而采用的实施方式，并非用以限定本公开。本公开的专利保护范围，仍须以所附的权利要求书所界定的范围为准。
工业实用性
本公开实施例提供的单信道连续业务的切换方法和装置中，MSCS根据从MME获取的切换号码，向IMS发送SIP建立请求消息，随后，MSCS在接收到IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送SRVCC切换完成通知消息。也就是说，MSCS不需要等待IMS返回的INFO消息，就可以向MME发送上述SRVCC切换完成通知消息，避免了IMS长时间不返回INFO消息，导致MME长时间接收不到SRVCC切换完成通知消息，从而主动向MSCS发送SRVCC切换取消消息以通知MSCS释放呼叫的现象，有利于提高SRVCC切换成功率。本公开实施例解决了相关技术中执行SRVCC切换的过程，可能由于IMS中网元处理消息不及时和兼容性等原因，而导致计算出的SRVCC切换成功率的指标较低的问题。

Claims (21)

  1. 一种单信道连续业务的切换方法，包括：
    移动交互中心服务器MSCS根据从移动性管理实体MME中获取的切换号码，向信息管理系统IMS发送会话初始协议SIP建立请求消息；
    所述MSCS在接收到所述IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向MME发送单信道连续业务SRVCC切换完成通知消息。
  2. 根据权利要求1所述的单信道连续业务的切换方法，其中，所述MSCS向IMS发送SIP建立请求消息之前，所述方法包括：
    所述MSCS接收所述MME发送的SRVCC切换请求消息，所述SRVCC切换请求消息中包括所述切换号码和所述目标基站的标识信息；
    所述MSCS根据所述目标基站的标识信息向所述目标基站发送切换检测请求消息；
    所述MSCS接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
  3. 根据权利要求2所述的单信道连续业务的切换方法，还包括：
    所述MSCS根据发送SRVCC切换完成通知消息的次数和接收SRVCC切换请求消息的次数，计算SRVCC切换成功率。
  4. 根据权利要求2所述的单信道连续业务的切换方法，其中，所述MSCS中设置有定时器，所述MSCS向IMS发送SIP建立请求消息之后，所述方法还包括：
    所述MSCS开启所述定时器；
    所述MSCS向MME发送SRVCC切换完成通知消息之后，所述方法还包括：
    在所述定时器达到预设时间未接收到所述IMS发送的INFO消息时，向所述MME发送取消SRVCC切换通知消息。
  5. 根据权利要求4所述的单信道连续业务的切换方法，还包括：
    所述MSCS根据发送SRVCC切换完成通知消息的次数、接收SRVCC切换请求消息的次数和发送取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
  6. 一种单信道连续业务的切换方法，包括：
    移动性管理实体MME向移动交互中心服务器MSCS发送单信道连续业务SRVCC切换请求消息；
    所述MME接收所述MSCS发送的SRVCC切换完成通知消息，所述SRVCC切换完成通知消息为所述MSCS在接收到信息管理系统IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向所述MME发送的。
  7. 根据权利要求6所述的单信道连续业务的切换方法，其中，所述SRVCC切换请求消息中包括目标基站的标识信息，所述SRVCC切换请求消息用于指示所述MSCS根据所述目标基站的标识信息向所述目标基站发送切换检测请求消息，并接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
  8. 根据权利要求6所述的单信道连续业务的切换方法，其中，所述SRVCC切换请求消息中包括切换号码，所述SRVCC切换请求消息用于指示所述MSCS根据所述切换号码向所述IMS发送会话初始协议SIP建立请求消息。
  9. 根据权利要求6～8中任一项所述的单信道连续业务的切换方法，还包括：
    所述MME根据接收SRVCC切换完成通知消息的次数和发送SRVCC切换请求消息的次数，计算SRVCC切换成功率。
  10. 根据权利要求6～8中任一项所述的单信道连续业务的切换方法，还包括：
    所述MME接收所述MSCS发送的取消SRVCC切换通知消息；
    所述MME根据接收SRVCC切换完成通知消息的次数、发送SRVCC切换请求消息的次数和接收取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
  11. 一种单信道连续业务的切换装置，其中，所述装置设置于移动交互中心服务器MSCS中，所述装置包括：
    发送模块，配置为根据从移动性管理实体MME中获取的切换号码，向信息管理系统IMS发送会话初始协议SIP建立请求消息；
    接收模块，配置为接收所述IMS发送的更新媒体消息和目标基站发送的切换检测完成消息；
    其中所述发送模块还配置为在所述接收模块接收到所述更新媒体消息和所述切换检测完成消息后，向MME发送单信道连续业务SRVCC切换完成通知消息。
  12. 根据权利要求11所述的单信道连续业务的切换装置，其中，所述接收模块还配置为在所述发送模块向IMS发送SIP建立请求消息之前，接收所述MME发送的SRVCC切换请求消息，所述SRVCC切换请求消息中包括所述切换号码和所述目标基站的标识信息；
    所述发送模块还配置为根据所述接收模块接收的所述目标基站的标识信息向所述目标基站发送切换检测请求消息；
    所述接收模块还配置为接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
  13. 根据权利要求12所述的单信道连续业务的切换装置，还包括：
    计算模块，配置为根据所述发送模块发送SRVCC切换完成通知消息的次数和所述接收模块接收SRVCC切换请求消息的次数，计算SRVCC切换成功率。
  14. 根据权利要求12所述的单信道连续业务的切换装置，其中，所述MSCS中设置有定时器，所述装置还包括：
    开启模块，配置为在所述发送模块向IMS发送SIP建立请求消息之后，开启所述定时器；
    其中所述发送模块还配置为在所述定时器达到预设时间未接收到所述IMS发送的INFO消息时，向所述MME发送取消SRVCC切换通知消息。
  15. 根据权利要求14所述的单信道连续业务的切换装置，还包括：
    计算模块，配置为根据所述发送模块发送SRVCC切换完成通知消息的次数、所述接收模块接收SRVCC切换请求消息的次数，以及所述发送模块发送取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
  16. 一种单信道连续业务的切换装置，其中，所述装置设置于移动性管理 实体MME中，所述装置包括：
    发送模块，配置为向移动交互中心服务器MSCS发送单信道连续业务SRVCC切换请求消息；
    接收模块，配置为接收所述MSCS发送的SRVCC切换完成通知消息，所述SRVCC切换完成通知消息为所述MSCS在接收到信息管理系统IMS发送的更新媒体消息和目标基站发送的切换检测完成消息后，向所述MME发送的。
  17. 根据权利要求16所述的单信道连续业务的切换装置，其中，所述SRVCC切换请求消息中包括目标基站的标识信息，所述SRVCC切换请求消息用于指示所述MSCS根据所述目标基站的标识信息向所述目标基站发送切换检测请求消息，并接收所述目标基站发送的切换检测响应消息，所述切换检测响应消息用于指示所述目标基站具有分配无线资源的能力。
  18. 根据权利要求16所述的单信道连续业务的切换装置，其中，所述SRVCC切换请求消息中包括切换号码，所述SRVCC切换请求消息用于指示所述MSCS根据所述切换号码向所述IMS发送会话初始协议SIP建立请求消息。
  19. 根据权利要求16～18中任一项所述的单信道连续业务的切换装置，还包括：
    计算模块，配置为根据所述接收模块接收SRVCC切换完成通知消息的次数和所述发送模块发送SRVCC切换请求消息的次数，计算SRVCC切换成功率。
  20. 根据权利要求16～18中任一项所述的单信道连续业务的切换装置，其中，所述接收模块还配置为接收所述MSCS发送的取消SRVCC切换通知消息；
    所述装置还包括：计算模块，配置为根据所述接收模块接收SRVCC切换完成通知消息的次数、所述发送模块发送SRVCC切换请求消息的次数，以及所述接收模块接收取消SRVCC切换通知消息的次数，计算SRVCC切换成功率。
  21. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令配置成执行权利要求1-10中任一项所述的方法。
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