WO2016037365A1 - Ps/cs协调方法与***以及移动交互中心 - Google Patents

Ps/cs协调方法与***以及移动交互中心 Download PDF

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Publication number
WO2016037365A1
WO2016037365A1 PCT/CN2014/086436 CN2014086436W WO2016037365A1 WO 2016037365 A1 WO2016037365 A1 WO 2016037365A1 CN 2014086436 W CN2014086436 W CN 2014086436W WO 2016037365 A1 WO2016037365 A1 WO 2016037365A1
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Prior art keywords
tmsi
msc
request message
lau request
domain
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PCT/CN2014/086436
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English (en)
French (fr)
Inventor
崇卫微
吴晓波
舒林
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华为技术有限公司
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Priority to CN201480035993.4A priority Critical patent/CN105594250B/zh
Priority to PCT/CN2014/086436 priority patent/WO2016037365A1/zh
Publication of WO2016037365A1 publication Critical patent/WO2016037365A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]

Definitions

  • the present invention relates to a wireless communication technology, and in particular, to a PS/CS coordination method and system and a mobile interaction center suitable for Single Radio Voice Call Continuity (SRVCC).
  • SRVCC Single Radio Voice Call Continuity
  • the user equipment In the second generation mobile communication technology (2nd Generation, 2G) or the third generation mobile communication technology (3G) network, the user equipment (User Equipment, UE for short) is circuit switched in the network (Circuit Switched, After the CS) domain and the Packet Switched (PS) domain are registered, the Mobile Switching Center (MSC) allocates the CS Domain Temporary Mobile Subscriber Identity (TMSI) to the UE.
  • the Serving GPRS Support Node SGSN allocates a Packet Temporary Mobile Subscriber Identity (P-TMSI) to the UE.
  • P-TMSI Packet Temporary Mobile Subscriber Identity
  • LTE Long Term Evolution
  • the UE is in LTE.
  • the Mobility Management Entity MME allocates the Globally Unique Temporary Identity (GUTI) of the Evolved Packet System (EPS) domain to the UE.
  • GTI Globally Unique Temporary Identity
  • an operator can provide CS domain and PS domain services to users at the same time, that is, the CS domain operators serving the users and the PS domain operators are always the same.
  • the network side will allocate the CS domain temporary identifier TMSI and the PS domain temporary identifier P-TMSI to the UE, both of which always point to the same carrier.
  • TMSI and the PS domain temporary identifier P-TMSI may not always be the case in the shared network.
  • the PS and CS registration messages of the UE are accepted by different sharing operators, The UE will receive a TMSI pointing to a shared carrier, and one P-TMSI will point to another shared carrier.
  • the access network base station will route subsequent service request messages or control messages to different operators based on these temporary identifiers.
  • the network that is, the so-called CS/PS inconsistency problem.
  • SRVCC is a widely used technology for interoperability of LTE voice services.
  • UE User Equipment
  • the mobile to LTE signal is weak and the 2G/3G network signal coverage is relatively high.
  • the VoIP voice service carried on the source network is smoothly switched to the CS domain of the target network to ensure voice call continuity.
  • the shared network including: multiple operators only share the access network and the core network is independent of the Multi-operator Core Network (MOCN) architecture and multiple operators share the access network and core
  • the gateway core network (GWCN) architecture of the network element including: multiple operators only share the access network and the core network is independent of the Multi-operator Core Network (MOCN) architecture and multiple operators share the access network and core
  • the gateway core network (GWCN) architecture of the network element is independent of the Multi-operator Core Network (MOCN) architecture and multiple operators share the access network and core
  • GWCN gateway core network
  • SRVCC handover process if the UE is switched from the LTE network to a shared 2G/3G network, and the UE needs to be switched from the EPS domain to the CS domain and the PS domain, the CS domain operator and the PS carrier selected for the UE are likely to appear.
  • CS/PS uncoordinated easily lead to uncertain network name display, double billing standards, and the uncertainty of the registered Public Land Mobile Network (RPLMN).
  • a pool-centric network-side triggered PS/CS coordination scheme is generally adopted, that is, if the core network node receives the If the TMSI or P-TMSI carried in the registration message of the user is not allocated by any MSC or SGSN in the resource pool in which the user is located, the CS/PS coordination process is triggered, so that the core network node or the base station controller (Base Station Controller, referred to as The BSC)/Radio Network Controller (RNC) selects a CS/PS domain operator for the UE according to its own policy.
  • the BSC Base Station Controller
  • RNC Radio Network Controller
  • the specific process is: when the UE performs the Location Area Update (LAU) process after the SRVCC is switched to the target 2G/3G network, the UE sends a LAU request message carrying the TMSI to the core network element MSC, if the carried TMSI If not allocated by any MSC in the resource pool, the MSC triggers the CS/PS coordination process; when the UE performs the Routing Area Update (RAU) process after the SRVCC switches to the target 2G/3G network, The core network element SGSN sends a RAU request message carrying the P-TMSI. If the carried P-TMSI is not allocated by any SGSN in the resource pool, the SGSN triggers the CS/PS coordination process.
  • LAU Location Area Update
  • RAU Routing Area Update
  • the resource pool-centric network-side triggering PS/CS coordination scheme requires the PS domain and the CS domain to simultaneously trigger the CS/PS coordination process to ensure that the coordinated CS domain and the PS domain point to the same carrier. Since the PS domain core network device switches from the MME of the EPS domain to the SGSN in the SRVCC process, the resource pool change must occur, and the GUTI allocated in the EPS domain is mapped to the P-TMSI of the PS domain, and the P-TMSI is not Belong to any SGSN allocated in the resource pool, so in the RAU process, one The SGSN will be triggered to perform the CS/PS coordination process. However, in the CS domain, the MSC resource pool is likely to be unchanged.
  • the TMSI carried in the LAU process is likely to belong to the MSC in the target network CS domain resource pool.
  • the MSC is triggered to perform the CS/PS coordination process, so that the problem of CS/PS uncoupling is easy to exist after the SRVCC is switched.
  • the embodiment of the present invention provides a PS/CS coordination method and system and a mobile interaction center, so as to overcome the problem that the CS and the PS are not coordinated when the UE switches to the shared network in the SRVCC handover process in the prior art.
  • an embodiment of the present invention provides a PS/CS coordination method, including:
  • the mobile switching center MSC determines that the voice call of the user equipment UE is caused by a single wireless voice call continuity SRVCC handover;
  • the MSC when the determined voice call caused by the SRVCC handover ends, sends a first temporary mobile subscriber identity TMSI re-allocation message to the UE, where the first TMSI re-allocation message includes a TMSI network element, where The TMSI network element includes a Network Resource Identifier (NRI), and the NRI is not allocated by any MSC in all MSC resource pools in the shared network where the MSC is located, so that the UE sends the location.
  • the area update LAU request message carries the TMSI network element, so that the MSC that receives the LAU request message is the UE according to the NRI trigger PS/CS coordination procedure included in the TMSI network element in the LAU request message. Re-select the operator of a CS domain.
  • the first TMSI re-allocation message further includes a first location area identifier (LAI), where the first The LAI is a non-broadcast LAI, so that after receiving the first TMSI reallocation message, the UE saves the first LAI and triggers an LAU procedure.
  • LAI first location area identifier
  • the method further includes:
  • the MSC in the determined voice call caused by the SRVCC handover, sends a second TMSI re-allocation message to the UE, where the second TMSI re-allocation message includes a second LAI, so that the UE After receiving the second TMSI reallocation message, saving the second LAI, and acquiring a public land mobile network PLMN identity as a registered one according to the second LAI PLMN.
  • the method further includes:
  • the MSC triggers a PS/CS coordination procedure to reselect an operator of the CS domain for the UE that sends the LAU request message.
  • the MSC triggers a PS/CS coordination process, and reselects a CS for the UE that sends the LAU request message.
  • the operator of the domain including:
  • the MSC triggers the PS/CS coordination process, and reselects a CS domain operator for the UE that sends the LAU request message according to the configuration policy, and sends the LAU request message to the operator of the selected CS domain.
  • One of the MSCs One of the MSCs.
  • the MSC triggers a PS/CS coordination process, and reselects a CS for the UE that sends the LAU request message.
  • the operator of the domain including:
  • the MSC sends a re-routing command to the base station controller BSC or the radio control center RNC, where the re-routing command includes an International Mobile Subscriber Identifier (IMSI) and a weight of the UE that sends the LAU request message.
  • IMSI International Mobile Subscriber Identifier
  • Directional indication information after the BSC or the RNC receives the rerouting command, reselecting a CS domain operator for the UE that sends the LAU request message according to the BSC or the RNC's own policy. And sending the LAU request message to an MSC corresponding to the operator of the selected CS domain.
  • an embodiment of the present invention provides an MSC, including:
  • a first determining module configured to determine that the ongoing voice call of the user equipment UE is caused by a single wireless voice call continuity SRVCC handover;
  • the first TMSI re-allocation message includes a TMSI network element, where the TMSI network element includes a network resource identifier NRI, and the NRI is not allocated by any MSC in all MSC resource pools in the shared network in which it resides, And causing the UE to send the location area update LAU request message to carry the TMSI network element, so that the MSC that receives the LAU request message according to the NRI trigger PS/CS coordination included in the TMSI network element in the LAU request message The process is to reselect an operator of the CS domain for the UE.
  • the first TSI re-allocation message further includes a first LAI, where the first LAI is a non-broadcast LAI, After receiving the first TMSI reallocation message, the UE saves the first LAI and triggers an LAU procedure.
  • the sending module is further configured to:
  • the method further includes:
  • a receiving module configured to receive a LAU request message sent by the UE, where the LAU request message carries the TMSI network element included in the first TMSI request message received by the UE;
  • a second determining module configured to determine, according to the NRI included in the TMSI network element, that the TMSI reported by the UE that sends the LAU request message is not allocated by any MSC in the resource pool to which it belongs;
  • the triggering module is configured to trigger a PS/CS coordination process, and reselect an operator of the CS domain for the UE that sends the LAU request message.
  • the triggering module is specifically configured to:
  • Triggering the PS/CS coordination process reselecting a CS domain operator for the UE that sends the LAU request message according to the configuration policy, and sending the LAU request message to the selected CS An MSC corresponding to the operator of the domain.
  • the triggering module is specifically configured to:
  • the RNC reselects a CS domain operator according to the BSC or the RNC's own policy to send the LAU request message, and sends the LAU request message to the selected one.
  • An MSC corresponding to the operator.
  • an embodiment of the present invention provides an MSC, including:
  • a memory a processor and a transceiver connected via a bus
  • the memory stores program code, and the processor executes the program code to perform the following steps:
  • TMSI network element includes a network resource identifier NRI, and the NRI is not allocated by any MSC in all MSC resource pools in the shared network in which the UE is located, so that the UE carries the location area update LAU request message when carrying And the MSC that receives the LAU request message, according to the NRI triggering PS/CS coordination procedure included in the TMSI network element in the LAU request message, to reselect a CS domain operation for the UE.
  • NRI network resource identifier
  • the processor executes the program code, and is further configured to perform the following steps:
  • first TMSI reassignment message Also included in the first TMSI reassignment message is a first location area identifier LAI, wherein the first LAI is a non-broadcast LAI, so that the UE saves after receiving the first TMSI reallocation message.
  • the first LAI triggers a LAU flow.
  • the processor executes the program code, and is further configured to perform the following steps:
  • the transceiver is invoked to send a second TMSI re-allocation message to the UE, where the second TMSI redistribution message includes a second LAI, so that After receiving the second TMSI re-allocation message, the UE saves the second LAI, and acquires a public land mobile network PLMN identity as a registered PLMN according to the second LAI.
  • the processor executes the program code, Used to perform the following steps:
  • the PS/CS coordination process is triggered to reselect an operator of the CS domain for the UE that sends the LAU request message.
  • the processor executes the program code, and is specifically configured to perform the following steps:
  • the PS/CS coordination process is triggered, and the UE that sends the LAU request message reselects an operator of the CS domain according to the configuration policy, and sends the LAU request message to an MSC corresponding to the operator of the selected CS domain. .
  • the processor is configured to execute the program code, and is specifically configured to perform the following steps:
  • the RNC reselects a CS domain operator for the UE that sends the LAU request message according to the BSC or the RNC's own policy, and sends the LAU request message to the One MSC corresponding to the operator of the selected CS domain.
  • the embodiment of the present invention provides a PS/CS coordination system, including: the MSC, the user, according to any one of the first to fifth possible implementation manners of the third aspect
  • the embodiment of the present invention provides that the first TMSI re-allocation message is sent by the MSC to the UE that performs the voice call caused by the SRVCC handover, and the TMSI cell carries none of the MSCs in all the resource pools in the shared network.
  • the allocated NRI is such that the UE saves the NRI and carries the NRI when the LAU request message is sent, so that the MSC that receives the LAU request message determines that the TMSI reported by the UE is not the MSC in the resource pool in which the UE is located.
  • the allocation which in turn triggers the PS/CS coordination process, reselects a CS domain operator for the UE, and solves the problem of using the pool centric scheme for SRVCC handover to the shared network in the prior art, the MSC does not
  • the PS/CS coordination process must be triggered, and the SGSN will definitely trigger the PS/CS coordination process, which will easily lead to the PS/CS uncoordinated problem.
  • the MSC will trigger the PS/CS coordination process to ensure the SRVCC process. PS/CS coordination.
  • FIG. 1 is a flowchart of a PS/CS coordination method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a PS/CS coordination method according to another embodiment of the present invention.
  • FIG. 3 is a signaling interaction diagram of a PS/CS coordination method according to still another embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an MSC according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an MSC according to another embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an MSC according to another embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a PS/CS coordination system according to an embodiment of the present invention.
  • the voice and data services are switched from the EPS domain of the LTE network to the CS domain and the PS domain of the 2G/3G network, that is, to the Global System for Mobile Communications (GSM). /Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GSM/EDGE Radio Access Network, GERAN)/Universal Terrestrial Radio Access Network (UTRAN) CS domain And PS domain.
  • GSM Global System for Mobile Communications
  • EDGE Enhanced Data Rates for GSM Evolution
  • GSM/EDGE Radio Access Network, GERAN Universal Terrestrial Radio Access Network
  • UTRAN Universal Terrestrial Radio Access Network
  • the source network side triggers the SRVCC handover procedure to the target network side to ensure that the voice service is not interrupted, thereby The handover of the voice session from the EPS domain of the LTE network to the CS domain of the 2G/3G network is continued by the target MSC.
  • FIG. 1 is a flowchart of a PS/CS coordination method according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 101 The MSC determines that the voice call of the UE is caused by the SRVCC handover.
  • the shared network includes one or more operators, each of which includes one or more MSC resource pools, each of which includes multiple MSCs, and the foregoing MSCs that provide voice services for the UE may be shared networks.
  • Step 102 The MSC sends a first TMSI re-allocation message to the UE when the determined voice call caused by the SRVCC handover ends, where the first TMSI re-allocation message includes a TMSI network element, where the TMSI network element includes an NRI, and
  • the NRI is not allocated to any MSC in the MSC resource pool in the shared network where the MSC is located, so that the UE carries the NRI when the LAU request message is sent, so that the MSC that receives the LAU request message is included in the LAU request message.
  • the above NRI triggers the PS/CS coordination process to reselect a CS domain operator for the UE.
  • the MSC determines that the ongoing voice call of the UE is caused by the SRVCC handover.
  • the signaling connection of the CS domain is not immediately released, but the first TMSI re-allocation message is sent to the UE.
  • the TMSI redistribution message includes a TMSI cell, and the NRI included in the TMSI cell is set to a special NRI, and the special NRI may be a special number sequence or a special character, which is not limited by the present invention.
  • the special NRI is not To share all resource pools in the network Any MSC in the allocation, in other words, the NRI is not recognized by any MSC in the resource pool.
  • the MSC may use the coding mode different from the NRI of all the MSCs to generate the special NRI, or assign a garbled code to the special NRI, or leave the special NRI blank, which is not limited by the present invention.
  • the UE After receiving the first TMSI re-allocation message sent by the MSC, the UE saves the TMSI including the special NRI as its own temporary identifier.
  • the UE When the LCA process is initiated by the BSC or the RNC to the core network MSC, the UE carries the NRI in the TMSI network element of the LAU request message.
  • the BSC or the RNC After receiving the LAU request message sent by the UE, acquires the NRI included in the TMSI network element, and queries the operator corresponding to the NRI in its configuration.
  • the BSC or the RNC cannot find a matching operator according to the configuration relationship, and randomly selects a CS domain operator for the UE according to a certain rule. And forwarding the LAU request message sent by the UE to an MSC of the selected operator.
  • the MSC that receives the LAU request message sent by the UE forwarded by the BSC or the RNC may be the foregoing MSC that provides voice service for the UE, or may be any other MSC in the shared network.
  • the MSC that receives the LAU request message determines the NRI that is included in the TMSI network element, and determines the reported by the UE according to the NRI. If the TMSI is not allocated by any MSC in its own resource pool, the PS/CS coordination process is triggered to reselect a CS domain operator for the UE.
  • the first TMSI re-allocation message is sent by the MSC to the UE that performs the voice call caused by the SRVCC handover, and the NSI that is not allocated by any MSC in all resource pools in the shared network is carried in the TMSI cell, so that the UE
  • the NRI is saved and carried in the subsequent transmission of the LAU request message, so that the MSC that receives the LAU request message determines that the TMSI reported by the UE is not allocated by any MSC in the resource pool in which the UE is located according to the foregoing NRI, thereby triggering the PS/CS.
  • the MSC does not necessarily trigger the PS/CS coordination process.
  • the SGSN will definitely trigger the PS/CS coordination process, which will easily lead to PS/CS uncoordinated problems.
  • the MSC will trigger the PS/CS coordination process to ensure PS/CS coordination in the SRVCC process.
  • the first TMSI reassignment message further includes a first LAI, where the first LAI is a non-broadcast LAI, so that the UE receives the first TMSI reallocation.
  • the first LAI is saved, and the LAU trigger condition is created, thereby initiating the LAU process.
  • the UE After receiving the broadcast LAI message sent by the base station of the radio access network in which the UE is located, the UE sends the broadcast LAI included in the broadcast LAI message and the core network MSC saved by the core network MSC in the process of LAU process or attaching. If the LAI is different, if the LAU request is different, the LAU request needs to wait until the location of the UE (Location Area, LA for short) changes, and the broadcast LAI and the LAI stored by the UE are different, and there is a certain Delay.
  • LA Location Area
  • the UE by including a first LAI in the first TMSI reassignment message, the UE receives the first TMSI reassignment message, receives a non-broadcast LAI and stores it, and compares the stored non-broadcast LAI with The LAI in the broadcast message is sent to the MSC as soon as the two are different, so that the UE can quickly initiate the LAU request after the CS voice session ends, thereby improving the efficiency of the PS/CS coordination.
  • the MSC sends a second TMSI re-allocation message to the UE during the determined voice call caused by the SRVCC handover, where the second TMSI re-allocation message includes a second LAI.
  • the second LAI may be a broadcast or non-broadcast LAI, so that after receiving the second TMSI reallocation message, the UE saves the second LAI and acquires a public land mobile network according to the second LAI (Public Land Mobile Network) , referred to as PLMN), as a registered PLMN, ie RPLMN.
  • PLMN Public Land Mobile Network
  • the second TMSI re-allocation message in this embodiment may also be sent by the MSC to the UE in the process of the SRVCC, and the implementation process is similar, and details are not described herein.
  • the UE may not be registered on any MSC before the SRVCC handover, or is not registered on the target network MSC.
  • the UE does not have an RPLMN, resulting in no UE.
  • the network name shows anomalies, and subsequent network reselection and cell reselection processes may also be affected.
  • the MSC sends a second TMSI re-allocation message to the UE in the SRVCC handover process, so that the UE can acquire the RPLMN according to a second LAI carried in the UE, thereby resolving the non-RPLMN triggered by the UE in the SRVCC process.
  • No problems such as network name display.
  • FIG. 2 is a flowchart of a PS/CS coordination method according to another embodiment of the present invention.
  • the embodiment is an extension of the method embodiment shown in FIG. 1.
  • the embodiment is that the MSC receives a message according to the first TMSI re-allocation message.
  • the specific implementation process of the sent LAU request message is as shown in FIG. 2, and the method embodiment includes:
  • Step 201 The MSC receives the LAU request message sent by the UE, where the LAU request message carries the TMSI network element included in the first TMSI request message received by the UE.
  • the TMSI network element is the same as the TMSI network element in the first embodiment of the present invention, and is a TMSI network element carried by the first TMSI re-allocation message sent by the MSC to the UE, and includes an NRI in the TMSI network element.
  • the NRI is not allocated to any MSC in all resource pools in the shared network, and details are not described herein.
  • Step 202 The MSC determines, according to the NRI included in the TMSI network element, that the TMSI reported by the UE that sends the LAU request message is not allocated by any MSC in the resource pool to which the MSC belongs.
  • Step 203 The MSC triggers a PS/CS coordination process to reselect an operator of the CS domain for the UE that sends the LAU request message.
  • the MSC re-selects a CS domain operator for the UE that sends the LAU request message, and may include the following two possible implementation manners:
  • the MSC re-selects an available CS carrier for the UE that sends the LAU request message according to its own configuration policy, and forwards the LAU request message to an MSC corresponding to the operator of the selected CS domain.
  • the MSC sends a re-routing command to the BSC or the RNC, where the re-routing command includes the IMSI and the redirection indication information of the UE that sends the LAU request message, so that the BSC or the RNC receives the re-routing command, according to the BSC or
  • the RNC's own policy is to reselect the operator of a CS domain for the UE transmitting the LAU request message, and forward the LAU request message to an MSC corresponding to the operator of the selected CS domain.
  • the MSC selects a CS domain operator for the UE through the configured policy.
  • the SGSN will trigger the PS/CS coordination process, SGSN.
  • the eNB and the SGSN can be re-assigned to the UE.
  • the MSC and the SGSN can be re-assigned to the UE.
  • the selected CS domain operator and PS domain operator will point to the same carrier, so that the UE is in the same carrier. PS domain and CS domain registration, thereby ensuring PS/CS coordination of UEs performing SRVCC handover;
  • the MSC returns a re-routing command including the IMSI and the redirection indication information of the UE to the BSC or the RNC, and informs the BSC or the RNC of the command by using the redirection indication information.
  • the purpose is to use PS/CS coordination, and the BSC or the RNC is required to re-select a CS domain operator for the user.
  • the BSC or the RNC After receiving the rerouting command, the BSC or the RNC reselects a CS domain for the UE according to its own policy (such as the IMSI hash method).
  • the carrier network is registered.
  • the SGSN After receiving the RAU request message, the SGSN also sends a re-routing command including the IMSI and the redirection indication information of the UE to the BSC or the RNC because the P-TMSI in the RAU cannot be identified.
  • the BSC or the RNC re-selects the carrier network of the PS domain for the UE to register according to its own policy. As long as the BSC or the RNC ensures the policy consistency of the same UE, the BSC or the RNC can be guaranteed to re-select the CS operator.
  • the PS domain operator is directed to the same carrier, so that the UE is registered in the PS domain and the CS domain of the same carrier, thereby ensuring PS/CS coordination of the UE performing the SRVCC handover.
  • the MSC, the BSC, or the RNC is a specific implementation process for the UE to re-select a CS domain. The same as the prior art, details are not described herein.
  • the MSC receives the LAU request message sent by the UE, where the UE carries the TMSI network element included in the first TMSI re-allocation message received by the UE in the LAU request message, where the TMSI network element includes For the NRI allocated by any MSC in the resource pool of the shared network, the MSC determines that the TMSI reported by the UE is not allocated by any MSC in the resource pool in which the UE is located according to the NRI carried in the LAU request message, thereby triggering the PS/CS coordination process.
  • Re-selecting a CS domain operator for the UE, and forwarding the LAU request message to an MSC corresponding to the operator of the selected CS domain, thereby solving the MSC that is easy to exist in the prior art does not necessarily trigger the PS/CS coordination process.
  • the SGSN will definitely trigger the PS/CS coordination process, which will easily lead to PS/CS uncoordinated problems.
  • the following takes the MOCN architecture shared network as an example to specifically describe the signaling interaction process between the network nodes involved in the embodiment of the present invention.
  • the implementation manner of the GWCN architecture shared network is similar, and details are not described herein.
  • FIG. 3 is a signaling interaction diagram of a PS/CS coordination method according to another embodiment of the present invention.
  • the shared network on the 2G/3G network side includes an operator A and an operator B, and each operator has 1
  • the MSC resource pools are respectively MSC pool A and MSC pool B.
  • MSC pool A includes two MSCs, which are respectively recorded as MSC A1 , MSC A2 and MSC pool B, which include two MSCs, which are respectively recorded as MSC B1.
  • MSC B2 and each operator has at least one SGSN, which is denoted as SGSN A and SGSN B respectively as an example to illustrate the specific implementation process of this embodiment.
  • SGSN A and SGSN B respectively as an example to illustrate the specific implementation process of this embodiment.
  • resource pools and each resource pool The implementation process of the MSC is similar, and is not described here.
  • the embodiment further includes signaling interaction between the UE and the source network side MME, and the BSC/RNC in the access network, as shown in FIG
  • Step 301 The MME on the source network side selects one MSC as the target MSC in the MSC A1 , the MSC A2, and the MSC B1 and the MSC B2 , and initiates an SRVCC handover to the target MSC.
  • the MME initiates a PS to CS (ps to cs) handover request to an MSC server on the target network side according to the logical interface Sv for the SRVCC and the self-selection policy between the MME and the MSC, where the request requires the MSC to be the UE.
  • the MME selects the MSC A1 as the target MSC as an example.
  • the implementation process of the MSC is similar to that of the other MSCs in the shared network, and details are not described herein.
  • Step 302 The MSC A1 sends a second TMSI re-allocation message to the UE during the voice call caused by the SRVCC process or the subsequent SRVCC handover, and carries a TMSI and a MSC A1 allocated to the UE in the message. Second LAI.
  • Step 303 The UE receives the second TMSI re-allocation message, saves the TMSI as its own temporary identifier, and acquires the RPLMN according to the second LAI.
  • Step 304 When the voice call caused by the SRVCC handover ends, the MSC A1 does not immediately release the CS domain signaling connection of the UE, and sends a first TMSI re-allocation message to the UE, where the message carries the TMSI cell and a first LAI.
  • the first LAI is a non-broadcast LAI, wherein an NRI is included in the TMSI cell, the NRI may be a special sequence of numbers or special characters, and the NRI is not any one of all resource pools in the shared network.
  • Step 305 After receiving the first TMSI re-allocation message, the UE saves the first LAI, and compares the first LAI with the LAI received in the broadcast message, because the LAI received in the first LAI and the broadcast message Certainly, the UE determines that the condition for triggering the LAU procedure is met, and sends a LAU request message to the BSC/RNC of the access network, and the LAU request message carries the TMSI cell included in the first TMSI re-allocation message, wherein the TMSI letter The above includes the above NRI.
  • Step 306 The BSC/RNC receives the LAU request message sent by the UE, obtains a TMSI cell from the LAU request message, and identifies the NRI in the TMSI cell, according to a mapping table of the NRI and the carrier relationship stored by the UE. Query the operator corresponding to the NRI. Since the NRI is not allocated to any MSC in all resource pools, the BSC/RNC cannot find the corresponding operator, so select a CS domain operator randomly or according to certain rules, and The LAU request message is forwarded to an MSC corresponding to the selected operator.
  • the selected carrier as the carrier A and forwarding the LAU request to the MSC A1 as an example for performing the subsequent steps.
  • the selected MSC being the MSC A2 or one of the operators B, the specific implementation process is similar. No longer repeat them.
  • Step 307 The MSC A1 receives the LAU request message forwarded by the BSC/RNC, and determines that the TMSI reported by the UE is not allocated by any MSC in the resource pool in which the UE is located according to the foregoing NRI, triggers a PS/CS coordination process, and sends the PS/CS coordination process to the BSC/RNC.
  • the rerouting command includes the IMSI and redirection indication information of the UE in the rerouting command.
  • Step 308 After receiving the rerouting command, the BSC/RNC reselects an operator of the CS domain for the UE according to the IMSI of the UE and the self-policy.
  • Step 309 The BSC/RNC forwards the LAU request message of the UE to an MSC corresponding to the operator of the selected CS domain, and the selected operator is the operator B.
  • the LAU request message may be forwarded to the MSC B1.
  • the MSC B2 the embodiment is forwarded to the MSC B1 as an example, and the process is similar to the other MSCs in the MSC resource pool included in the selected carrier B, and details are not described herein.
  • Step 310 The UE triggers a Route Area Update (RAU) process, and sends a RAU request message to the BSC/RNC, and carries the P-TMSI mapped by the GUTI allocated by the MME in the RAU request message.
  • RAU Route Area Update
  • Step 311 After receiving the RAU request message sent by the UE, the BSC/RNC randomly selects one SGSN and forwards the RAU request message to the SGSN because the P-TMSI is not allocated by any SGSN on the 2G/3G network side.
  • Step 312 After receiving the RAU request message, the SGSN A triggers the PS/CS coordination process to send a re-routing command to the BSC/RNC after the P-TMSI is not allocated by any SGSN on the 2G/3G network side, where the re-routing is performed.
  • the command includes the IMSI and redirection indication information of the UE.
  • Step 313 After receiving the rerouting command, the BSC/RNC reselects a carrier of the PS domain for the UE according to its own policy. For the same UE, the BSC/RNC uses the same policy to select the operator of the CS domain or the PS domain. It can be ensured that the operator of the PS domain selected by the UE is the same as the operator of the CS domain, and the operator of the PS domain that the BSC/RNC reselects for the UE is also the operator B.
  • Step 314 The BSC/RNC forwards the RAU request message to the SGSN B that is reselected for the UE.
  • FIG. 4 is a schematic structural diagram of an MSC according to an embodiment of the present invention. As shown in FIG. 4, the MSC 400 includes a first determining module 401 and a sending module 402.
  • the first determining module 401 is configured to determine that the voice call of the UE is caused by the SRVCC switch;
  • the sending module 402 is configured to send a first TMSI re-allocation message to the UE when the voice call caused by the SRVCC handover is determined by the first determining module 401, where the first TMSI re-allocation message includes a TMSI network element, where the TMSI
  • the network element includes an NRI, and the NRI is not allocated by any MSC in all the MSC resource pools in the shared network, so that the UE carries the LSI request message when transmitting the LAU request message, so that the LAU request message is received.
  • the MSC re-selects a CS domain operator for the UE according to the NRI triggering PS/CS coordination procedure included in the TMSI network element in the LAU request message.
  • the first TMSI re-allocation message further includes a first LAI, where the first LAI is a non-broadcast LAI, so that the UE saves the first TMSI re-allocation message after receiving the first The first LAI, which manufactures the LAU trigger condition, initiates the LAU process.
  • the sending module 402 is further configured to send a second TMSI re-allocation message to the UE, in the process of the voice call caused by the SRVCC handover determined by the first determining module 401, the second The TMSI redistribution message includes a second LAI.
  • the second LAI may be a broadcast or non-broadcast LAI, so that after receiving the second TMSI re-allocation message, the UE saves the second LAI and acquires a PLMN identity as the registered PLMN according to the second LAI.
  • the MSC provided by the embodiment of the present invention may be used to implement the technical solution in the method embodiment shown in FIG. 1.
  • the implementation principle and technical effects are similar, and details are not described herein.
  • FIG. 5 is a schematic structural diagram of an MSC according to another embodiment of the present invention, where The MSC 500 is an extension of the MSC shown in FIG. 4 to process the LAU request message sent by the received UE according to the first TMSI re-allocation message. As shown in FIG. 5, the MSC 500 further includes:
  • the receiving module 501 is configured to receive a LAU request message sent by the UE, where the LAU request message carries the TMSI network element included in the first TMSI request message received by the UE;
  • the second determining module 502 is configured to determine, according to the NRI included in the foregoing TMSI network element, that the TMSI reported by the UE that sends the LAU request message is not allocated by any MSC in the resource pool to which it belongs;
  • the triggering module 503 is configured to trigger a PS/CS coordination process to reselect an operator of the CS domain for the UE that sends the LAU request message.
  • triggering module 503 is specifically configured to:
  • the PS/CS coordination process is triggered, and the UE that sends the LAU request message reselects an operator of the CS domain according to the configuration policy, and sends the LAU request message to an MSC corresponding to the operator of the selected CS domain.
  • the trigger module 503 is specifically configured to:
  • the request message UE reselects an operator of a CS domain and sends a LAU request message to an MSC corresponding to the selected operator.
  • the MSC provided in this embodiment may be used to implement the technical solution in the embodiment of the method shown in FIG. 1 and the embodiment of the MSC in the embodiment shown in FIG. 3, and the implementation principle and the technical effect are similar. No longer.
  • FIG. 6 is a schematic structural diagram of an MSC according to another embodiment of the present invention.
  • the MSC 600 includes: a memory 601 connected by a bus (shown by a thick solid line in the figure), a processor 602, and a transceiver 602. 603, wherein
  • the memory 601 stores program code, and the processor 602 executes the program code for performing the following steps:
  • the TMSI network element includes an NRI, and the NRI is not allocated by any MSC in all the MSC resource pools in the shared network, so that the UE carries the LSI request message and carries the TMSI network element, so that the MSC receives the LAU request message.
  • the operator of the CS domain is reselected for the UE according to the NRI triggering PS/CS coordination procedure included in the TMSI network element in the LAU request message.
  • the processor 602 executes the program code, and is further configured to perform the following steps:
  • the first LAI is further included in the first TSI re-allocation message, where the first LAI is a non-broadcast LAI, so that after receiving the first TSI re-allocation message, the UE saves the first LAI, triggering the LAU process.
  • the processor 602 executes the program code, and is further configured to perform the following steps:
  • the transceiver 603 is invoked to send a second TMSI re-allocation message to the UE, and the second TMSI re-allocation message includes a second LAI, so that the UE receives the second TMSI reallocation.
  • the second LAI is saved, and a PLMN identity is acquired as the registered PLMN according to the second LAI.
  • the processor 602 executes the program code, and is further configured to perform the following steps:
  • the transceiver 603 is configured to receive the LAU request message sent by the UE, where the LAU request message carries the TMSI network element included in the first TMSI request message received by the UE;
  • the PS/CS coordination process is triggered to reselect an operator of the CS domain for the UE that sends the LAU request message.
  • processor 602 executes the program code, specifically for performing the following steps:
  • the PS/CS coordination process is triggered, and the UE that sends the LAU request message reselects an operator of the CS domain according to the configuration policy, and sends the LAU request message to an MSC corresponding to the operator of the selected CS domain.
  • the processor 602 executes the program code, specifically for performing the following steps:
  • the UE requesting the message reselects the operator of a CS domain and sends a LAU request message to the operator of the selected CS domain. Should be an MSC.
  • the MSC in this embodiment may be used to perform a technical solution that can be used to implement the technical solution in the embodiment of the method shown in FIG. 2 and the MSC corresponding part in the embodiment shown in FIG. 3, and the implementation principle and technical effect are Similarly, the details will not be described again.
  • FIG. 7 is a schematic structural diagram of a PS/CS coordination system according to an embodiment of the present invention.
  • the PS/CS coordination system 700 includes: an MSC 701, a UE 702, a BSC 703 or an RNC 704, and an SGSN 705.
  • the MSC 701 may be the MSC 500 or the MSC 600 provided in the embodiment shown in FIG. 5 or FIG. 6.
  • the implementation principle and technical effects are similar, and details are not described herein.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure.
  • connection may suitably be a computer readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave
  • coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

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Abstract

本发明提供一种PS/CS协调方法与***以及移动交互中心，包括：MSC确定UE的语音通话为SRVCC切换引起的；MSC在确定由SRVCC切换引起的语音通话结束时，向UE发送第一TMSI重分配消息，第一TMSI重分配消息中包括TMSI网元，其中TMSI网元包括一个NRI，并且该NRI不为MSC所在共享网络中所有MSC资源池中的任何MSC所分配，以使UE发送LAU请求消息时携带该TMSI网元，进而使得接收到LAU请求消息的MSC根据LAU请求消息中TMSI网元包括的NRI触发PS/CS协调流程，为UE重新选择一个CS域的运营商，以解决SRVCC切换到共享网络容易存在的PS/CS不协调的问题。

Description

PS/CS协调方法与***以及移动交互中心 技术领域
本发明涉及无线通信技术，尤其涉及一种适用于单一无线语音呼叫连续性(Single Radio Voice Call Continuity，简称SRVCC)的PS/CS协调方法与***以及移动交互中心。
背景技术
在第二代移动通信技术(2nd Generation，简称2G)或第三代移动通信技术(3rd Generation，简称3G)网络中，用户设备(User Equipment，简称UE)在网络中的电路交换(Circuit Switched，简称CS)域和分组交换(Packet Switched，简称PS)域注册后，移动交换中心(Mobile Switching Center，简称MSC)给UE分配CS域临时移动用户标识(Temporary Mobile Subscriber Identity,简称TMSI)，GPRS业务支撑节点(Serving GPRS Support Node，简称SGSN)给UE分配PS域分组临时移动用户标识(Packet Temporary Mobile Subscriber Identity,简称P-TMSI)；在长期演进(Long Term Evolution，简称LTE)中，UE在LTE网络中注册后，移动性管理实体(Mobility Management Entity，简称MME)给UE分配演进分组***(Evolved Packet System，简称EPS)域的全局唯一的临时标识(Globally Unique Temporary Identity，简称GUTI)。
传统网络中，一个运营商可同时为用户提供CS域和PS域服务，也即服务于用户的CS域运营商和PS域运营商总是相同。UE在网络中的CS域和PS域注册之后，网络侧将会为UE分配的CS域临时标识TMSI和PS域临时标识P-TMSI，两者总是指向同一个运营商。但共享网络中可能并不总是这样，因资源匮乏或者选网策略等原因存在两个域的运营商不相同的情况，如果UE的PS和CS注册消息分别被不同的共享运营商所接受，则UE将会收到一个TMSI指向一个共享运营商，一个P-TMSI指向另一个共享运营商，接入网基站将基于这些临时标识将后续的业务请求消息或控制消息等路由至不同的运营商网络，也即产生所谓的CS/PS不协调问题。
SRVCC是针对LTE语音业务互操作的广泛应用的技术，指当用户设备(User Equipment，简称UE)在使用LTE网络进行VOIP语音通话过程中，移动到LTE信号较弱而2G/3G网络信号覆盖较好的区域时，将承载在源网络的VoIP语音业务平滑切换到目标网络的CS域，以保证语音呼叫连续性。随着共享网络的出现，包括：多个运营商仅共享接入网而核心网独立的多运营商核心网(Multi-operator Core Network，简称MOCN)架构和多个运营商共享接入网和核心网网元的网关核心网(Gateway Core Network，简称GWCN)架构。上述SRVCC切换过程中，若UE从LTE网络切换到一个2G/3G的共享网络，需要将UE从EPS域切换到CS域和PS域，则容易出现为UE选择的CS域运营商和PS运营商不同，产生CS/PS不协调，容易导致网络名称显示不确定，双重计费标准，以及已注册公用陆地移动网(Registered Public Land Mobile Network，简称RPLMN)不确定等问题。
为避免UE在SRVCC过程中出现CS/PS不协调的问题，现有技术中，通常采用以资源池为中心(pool centric)的网络侧触发PS/CS协调方案，即如果核心网节点收到来自用户的注册消息中所带的TMSI或P-TMSI不为自身所在资源池中的任何MSC或SGSN所分配，则触发CS/PS协调流程，使得核心网节点或基站控制器(Base Station Controller，简称BSC)/无线网络控制器(Radio Network Controller，简称RNC)根据自身策略为UE选择一个CS/PS域运营商。具体过程为：UE在经SRVCC切换至目标2G/3G网络后，进行位置区更新(Location Area Update，简称LAU)过程时，向核心网元MSC发送携带有TMSI的LAU请求消息，若携带的TMSI不为资源池中的任何MSC所分配，则MSC触发进行CS/PS协调流程；UE在经SRVCC切换至目标2G/3G网络后，进行路由区更新(Route Area Update，简称RAU)过程时，向核心网元SGSN发送携带有P-TMSI的RAU请求消息，若携带的P-TMSI不为资源池中的任何SGSN所分配，则SGSN触发进行CS/PS协调流程。
上述以资源池为中心的网络侧触发PS/CS协调方案，要求PS域和CS域同时触发CS/PS协调流程，以保证协调后的CS域和PS域指向同一个运营商。由于UE在SRVCC过程中PS域核心网设备从EPS域的MME切换到SGSN，一定发生了资源池的改变，在EPS域分配的GUTI被映射为PS域的P-TMSI，并且该P-TMSI不属于资源池中任何SGSN所分配，因此在RAU过程中，一 定会触发SGSN进行CS/PS协调流程，然而，在CS域，MSC资源池很可能没有改变，在LAU过程中所携带的TMSI很可能属于目标网络CS域资源池中的MSC所分配，则不会触发MSC进行CS/PS协调流程，使得SRVCC切换后很容易存在CS/PS不协调的问题。
发明内容
有鉴于此，本发明实施例提供一种PS/CS协调方法与***以及移动交互中心，以克服现有技术中SRVCC切换过程中，UE切换至共享网络时容易存在CS与PS不协调的问题。
第一方面，本发明实施例提供一种PS/CS协调方法，包括：
移动交换中心MSC确定用户设备UE的语音通话为单一无线语音呼叫连续性SRVCC切换引起的；
所述MSC，在确定的由所述SRVCC切换引起的语音通话结束时，向所述UE发送第一临时移动用户标识TMSI重分配消息，所述第一TMSI重分配消息中包括TMSI网元，其中所述TMSI网元包括一个网络资源标识(Network Resource Identifier，简称NRI)，并且所述NRI不为所述MSC所在共享网络中所有MSC资源池中的任何MSC所分配，以使所述UE发送位置区更新LAU请求消息时携带所述TMSI网元，进而使得接收到所述LAU请求消息的MSC根据所述LAU请求消息中TMSI网元包括的所述NRI触发PS/CS协调流程，为所述UE重新选择一个CS域的运营商。
结合第一方面，在第一方面的第一种可能的实现方式中，所述第一TMSI重分配消息中还包括一个第一位置区标识(Location Area Identifier，简称LAI)，其中所述第一LAI为非广播LAI，以使所述UE在接收到所述第一TMSI重分配消息后，保存所述第一LAI，并触发LAU流程。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，还包括：
所述MSC，在确定的由所述SRVCC切换引起的语音通话过程中，向所述UE发送第二TMSI重分配消息，所述第二TMSI重分配消息包括一个第二LAI，以使所述UE接收到所述第二TMSI重分配消息后，保存所述第二LAI，并根据所述第二LAI获取一个公共陆上移动网络PLMN标识作为已注册的 PLMN。
结合第一方面和第一方面的第一到第二种可能的实现方式中的任一种，在第一方面的第三种可能的实现方式中，还包括：
所述MSC接收UE发送的LAU请求消息，所述LAU请求消息中携带有所述UE接收到的所述第一TMSI请求消息中包括的所述TMSI网元；
所述MSC根据所述TMSI网元中包括的所述NRI确定发送所述LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
所述MSC触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商。
结合第一方面的第三种可能的实现方式，在第一方面的第四种可能的实现方式中，所述MSC触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商，包括：
所述MSC触发PS/CS协调流程，根据自身配置策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
结合第一方面的第三种可能的实现方式，在第一方面的第五种可能的实现方式中，所述MSC触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商，包括：
所述MSC向基站控制器BSC或者无线控制中心RNC发送重新路由命令，所述重新路由命令中包括发送所述LAU请求消息的UE的国际移动用户标识符(International Mobile Subscriber Identifier，简称IMSI)和重定向指示信息，以使所述BSC或者所述RNC收到所述重新路由命令后，根据所述BSC或者所述RNC自身的策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
第二方面，本发明实施例提供一种MSC，包括：
第一确定模块，用于确定用户设备UE正在进行的语音通话为单一无线语音呼叫连续性SRVCC切换引起的；
发送模块，用于在所述第一确定模块确定的由所述SRVCC切换引起的语音通话结束时，向所述UE发送第一临时移动用户标识TMSI重分配消息， 所述第一TMSI重分配消息中包括TMSI网元，其中所述TMSI网元包括一个网络资源标识NRI，并且所述NRI不为自身所在共享网络中所有MSC资源池中的任何MSC所分配，以使所述UE发送位置区更新LAU请求消息时携带所述TMSI网元，进而使得接收到所述LAU请求消息的MSC根据所述LAU请求消息中TMSI网元包括的所述NRI触发PS/CS协调流程，为所述UE重新选择一个CS域的运营商。
结合第二方面，在第二方面的第一种可能的实现方式中，所述第一TMSI重分配消息中还包括一个第一LAI，其中所述第一LAI为非广播LAI，以使所述UE在接收到所述第一TMSI重分配消息后，保存所述第一LAI，并触发LAU流程。
结合第二方面或第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，所述发送模块还用于：
在所述第一确定模块确定的由所述SRVCC切换引起的语音通话过程中，向所述UE发送第二TMSI重分配消息，所述第二TMSI重分配消息包括一个第二LAI，以使所述确定的UE接收到所述第二TMSI重分配消息后，保存所述第二LAI，并根据所述第二LAI获取一个公共陆上移动网络PLMN标识作为已注册的PLMN。
结合第二方面和第二方面的第一到第二种可能的实现方式中的任一种，在第二方面的第三种可能的实现方式中，还包括：
接收模块，用于接收UE发送的LAU请求消息，所述LAU请求消息中携带有所述UE接收到的所述第一TMSI请求消息中包括的所述TMSI网元；
第二确定模块，用于根据所述TMSI网元中包括的所述NRI确定发送所述LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
触发模块，用于触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商。
结合第二方面的第三种可能的实现方式，在第二方面的第四种可能的实现方式中，所述触发模块，具体用于：
触发PS/CS协调流程，根据自身配置策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS 域的运营商对应的一个MSC。
结合第二方面的第三种可能的实现方式，在第二方面的第五种可能的实现方式中，所述触发模块，具体用于：
向基站控制器BSC或者无线控制中心RNC发送重新路由命令，所述重新路由命令中包括发送所述LAU请求消息UE的国际移动用户标识符IMSI和重定向指示信息，以使所述BSC或者所述RNC收到所述重新路由命令后，根据所述BSC或者所述RNC自身的策略为发送所述LAU请求消息UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的运营商对应的一个MSC。
第三方面，本发明实施例提供一种MSC，包括：
通过总线连接的存储器，处理器和收发器；
所述存储器存储程序代码，所述处理器执行所述程序代码，用于执行如下步骤：
确定用户设备UE的语音通话为单一无线语音呼叫连续性SRVCC切换引起的；
调用所述收发器，在确定的由所述SRVCC切换引起的语音通话结束时，向所述UE发送第一临时移动用户标识TMSI重分配消息，所述第一TMSI重分配消息中包括TMSI网元，其中所述TMSI网元包括一个网络资源标识NRI，并且所述NRI不为自身所在共享网络中所有MSC资源池中的任何MSC所分配，以使所述UE发送位置区更新LAU请求消息时携带所述TMSI网元，进而使得接收到所述LAU请求消息的MSC根据所述LAU请求消息中TMSI网元包括的所述NRI触发PS/CS协调流程，为所述UE重新选择一个CS域的运营商。
结合第三方面，在第三方面的第一种可能的实现方式中，所述处理器执行所述程序代码，还用于执行如下步骤：
在所述第一TMSI重分配消息中还包括一个第一位置区标识LAI，其中所述第一LAI为非广播LAI，以使所述UE在接收到所述第一TMSI重分配消息后，保存所述第一LAI，触发LAU流程。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，所述处理器执行所述程序代码，还用于执行如下步骤：
在确定的由所述SRVCC切换引起的语音通话过程中，调用所述收发器，向所述UE发送第二TMSI重分配消息，所述第二TMSI重分配消息包括一个第二LAI，以使所述UE接收到所述第二TMSI重分配消息后，保存所述第二LAI，并根据所述第二LAI获取一个公共陆上移动网络PLMN标识作为已注册的PLMN。
结合第三方面和第三方面的第一到第二种可能的实现方式中的任一种，在第三方面的第三种可能的实现方式中，所述处理器执行所述程序代码，还用于执行如下步骤：
调用所述收发器，接收UE发送的LAU请求消息，所述LAU请求消息中携带有所述UE接收到的所述第一TMSI请求消息中包括的所述TMSI网元；
根据所述TMSI网元中包括的所述NRI确定发送所述LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商。
结合第三方面的第三种可能的实现方式，在第三方面的第四种可能的实现方式中，所述处理器执行所述程序代码，具体用于执行如下步骤：
触发PS/CS协调流程，根据自身配置策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
结合第三方面的第三种可能的实现方式，在第三方面的第五种可能的实现方式中，所述处理器执行所述程序代码，具体用于执行如下步骤：
向基站控制器BSC或者无线控制中心RNC发送重新路由命令，所述重新路由命令中包括发送所述LAU请求消息的UE的国际移动用户标识符IMSI和重定向指示信息，以使所述BSC或者所述RNC收到所述重新路由命令后，根据所述BSC或者所述RNC自身的策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
第四方面，本发明实施例提供一种PS/CS协调***，包括：如第三方面以及第三方面的第一至第五种可能的实现方式中的任一项所述的MSC，用户 设备UE，基站控制器BSC或者无线控制中心RNC，以及GPRS业务支撑节点SGSN。
通过上述方案，本发明提供的实施例，通过MSC向进行SRVCC切换引起的语音通话的UE发送第一TMSI重分配消息，并在其中TMSI信元中携带不为共享网络中所有资源池中任何MSC所分配的NRI，使得UE保存该NRI并在后续发送LAU请求消息时携带该NRI，从而使得接收到LAU请求消息的MSC根据上述NRI确定UE上报的TMSI不为自身所在资源池中的任意MSC所分配，进而触发PS/CS协调流程，为UE重新选择一个CS域的运营商，解决了现有技术中采用以资源池为中心(pool centric)的方案进行SRVCC切换到共享网络过程中，MSC不一定触发PS/CS协调流程，而SGSN肯定会触发PS/CS协调流程，而容易导致PS/CS不协调的问题，实现了SRVCC过程中MSC一定会触发PS/CS协调流程，从而保证SRVCC过程中PS/CS协调。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明一个实施例提供的PS/CS协调方法的流程图；
图2为本发明另一个实施例提供的PS/CS协调方法的流程图；
图3为本发明再一个实施例提供的PS/CS协调方法的信令交互图；
图4为本发明一个实施例提供的MSC的结构示意图；
图5为本发明另一个实施例提供的MSC的结构示意图；
图6为本发明又一个实施例提供的MSC的结构示意图；
图7为本发明一个实施例提供的PS/CS协调***的结构示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述，显然，所描述的实施例仅仅是本发明一部份实施 例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
在SRVCC切换过程中，将话路和数据业务由LTE网络的EPS域分别切换到2G/3G网络的CS域和PS域，也即切换到全球移动通讯***(Global System for Mobile Communications，简称GSM)/增强型数据(Enhanced Data rates for GSM Evolution，简称EDGE)无线接入网(GSM/EDGE Radio Access Network，简称GERAN)/通用陆地无线接入网(Universal Terrestrial Radio Access Network，简称UTRAN)的CS域和PS域。当正在进行VOIP语音业务的UE从LTE信号覆盖区进入一个共享2G/3G网络信号覆盖区的时候，为保证语音业务不被中断，源网络侧向目标网络侧触发SRVCC切换流程，从而将UE的语音会话从LTE网络的EPS域切换到2G/3G网络的CS域由目标MSC继续执行。
图1为本发明一个实施例提供的PS/CS协调方法的流程图，如图1所示，该方法包括以下步骤：
步骤101、MSC确定UE的语音通话为SRVCC切换引起的。
通常地，共享网络中，包括一个或多个运营商，每个运营商包括一个或多个MSC资源池，每个资源池中包括多个MSC，为UE提供语音服务的上述MSC可以为共享网络中任一运营商的任一资源池中的一个MSC。
步骤102、MSC，在确定的由SRVCC切换引起的语音通话结束时，向UE发送第一TMSI重分配消息，第一TMSI重分配消息中包括TMSI网元，其中该TMSI网元包括一个NRI，并且该NRI不为MSC所在共享网络中所有MSC资源池中的任何MSC所分配，以使UE发送LAU请求消息时携带上述NRI，进而使得接收到该LAU请求消息的MSC根据该LAU请求消息中包括的上述NRI触发PS/CS协调流程，为UE重新选择一个CS域的运营商。
具体来说，MSC确定UE正在进行的语音通话为SRVCC切换引起的，在该语音通话结束时，并不立即释放CS域的信令连接，而是向UE发送第一TMSI重分配消息，在该TMSI重分配消息中包括TMSI信元，并且将该TMSI信元中包括的NRI设置为一特殊NRI，该特殊NRI可以是一特殊数字序列或者特殊字符，对此本发明不作限定，该特殊NRI不为共享网络中所有资源池 中的任何MSC所分配，换句话说，该NRI不被资源池中任何MSC所识别。
具体实现时，MSC可以采用与所有MSC分配NRI不同的编码方式来生成上述特殊NRI，或者为上述特殊NRI分配一个乱码，或者将上述特殊NRI置空，本发明对此不作限定。
上述UE在接收到上述MSC发送的第一TMSI重分配消息后，保存含上述特殊NRI的TMSI作为自身的临时标识。后续经BSC或者RNC向核心网MSC发起LAU流程时，UE在上述LAU请求消息的TMSI网元中携带上述NRI。BSC或者RNC接收到UE发送的上述LAU请求消息后，获取TMSI网元中包含的NRI，在自身的配置中查询与上述NRI所对应的运营商。由于上述TMSI中包含的NRI是个特殊NRI，不为共享网络中任何MSC所分配，BSC或者RNC无法根据配置关系找到匹配的运营商，则随机或根据一定的规则为UE选择一个CS域的运营商，并向选择的运营商的一个MSC转发UE发送的LAU请求消息。
此处需说明的是，接收到BSC或者RNC转发的UE发送的LAU请求消息的MSC，可以是为UE提供语音服务的上述MSC，也可以为共享网络中的任意一个其他MSC。
由于该LAU请求消息中TMSI网元中包括的NRI不为共享网络中任一MSC所分配，接收到LAU请求消息的MSC在获取到TMSI网元中包括的NRI后，根据该NRI确定UE上报的TMSI不为自身资源池中任意MSC所分配，则触发PS/CS协调流程，为UE重新选择一个CS域的运营商。
本实施例，通过MSC向进行SRVCC切换引起的语音通话的UE发送第一TMSI重分配消息，并在其中TMSI信元中携带不为共享网络中所有资源池中任何MSC所分配的NRI，使得UE保存该NRI并在后续发送LAU请求消息时携带该NRI，从而使得接收到LAU请求消息的MSC根据上述NRI确定UE上报的TMSI不为自身所在资源池中的任意MSC所分配，进而触发PS/CS协调流程，为UE重新选择一个CS域的运营商，解决了现有技术中采用以资源池为中心(pool centric)的方案进行SRVCC切换到共享网络过程中，MSC不一定触发PS/CS协调流程，而SGSN肯定会触发PS/CS协调流程，而容易导致PS/CS不协调的问题，实现了SRVCC过程中MSC一定会触发PS/CS协调流程，从而保证SRVCC过程中PS/CS协调。
在本发明的一个优选实施例中，上述第一TMSI重分配消息中还包括一个第一LAI，该第一LAI为非广播(non-broadcast)LAI，使得上述UE在接收到第一TMSI重分配消息后，保存该第一LAI，制造LAU触发条件，从而发起LAU流程。
通常地，UE在接收到自身所在无线接入网的基站发送的广播LAI消息后，将该广播LAI消息中包括的广播LAI与自身保存的由核心网MSC在LAU过程或附着等过程中下发的LAI相比较，若不同则发起LAU请求，该LAU请求需要等到因UE所处的位置区(Location Area，简称LA)发生改变而导致广播LAI和自身所存的LAI不同时才能发起，存在一定的延时。
该优选实施例，通过在第一TMSI重分配消息中包括一个第一LAI，使得UE收到第一TMSI重分配消息的同时，接收到一个非广播LAI并存储，比较该存储的非广播LAI与广播消息中的LAI，由于两者必定不相同，则立即向MSC发送LAU请求消息，使得UE在CS语音会话结束后可以快速发起LAU请求，进而提高PS/CS协调的效率。
在本发明提供的另一个优选实施例中，MSC，在确定的由SRVCC切换引起的语音通话过程中，向UE发送第二TMSI重分配消息，该第二TMSI重分配消息包括一个第二LAI，该第二LAI可以为一个广播的或者非广播的LAI，以使UE接收到第二TMSI重分配消息后，保存第二LAI，并根据第二LAI获取一个公共陆上移动网络(Public Land Mobile Network,简称PLMN)标识作为已注册的(registered)PLMN，即RPLMN。
需说明的是，本实施例中的第二TMSI重分配消息，也可以由MSC在SRVCC过程中向UE发送，其实现过程是类似的，具体不再赘述。
通常地，UE在SRVCC切换之前可能并没有在任何MSC上注册过，或没有在目标网络MSC上注册过，则在切换过程中或在CS域通话过程中，UE并无RPLMN，导致如UE无网络名称显示等异常情况，并且后续网络重选和小区重选流程也可能会受到影响。
该优选实施例，通过在SRVCC切换过程中，MSC向UE发送第二TMSI重分配消息使得UE可以根据其中携带的一个第二LAI获取RPLMN，从而解决UE在SRVCC过程中可能存在的无RPLMN引发的无网络名称显示等问题。
图2为本发明另一个实施例提供的PS/CS协调方法的流程图，该实施例为图1所示方法实施例的一个扩展，该实施例为MSC接收到UE根据第一TMSI重分配消息发送的LAU请求消息的具体实施过程，如图2所示，该方法实施例包括：
步骤201、MSC接收UE发送的LAU请求消息，该LAU请求消息中携带有UE接收到的第一TMSI请求消息中包括的TMSI网元；
其中，该TMSI网元与本发明实施例一中所述的TMSI网元相同，为MSC向UE发送的第一TMSI重分配消息携带的TMSI网元，并且在该TMSI网元中包括一个NRI，该NRI不为共享网络中所有资源池中的任何MSC所分配，具体不再赘述。
步骤202、MSC根据上述TMSI网元中包括的NRI确定发送LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
步骤203、MSC触发PS/CS协调流程，为发送LAU请求消息的UE重新选择一个CS域的运营商。
其中，步骤203中，MSC为发送上述LAU请求消息的UE重新选择一个CS域的运营商，可以包括如下两种可能的实现方式：
第一种，MSC根据自身配置策略为发送上述LAU请求消息的UE重新选择一个可用的CS运营商，并将LAU请求消息转发给所选择的CS域的运营商对应的一个MSC。
第二种，MSC向BSC或者RNC发送重新路由命令，该重新路由命令中包括发送上述LAU请求消息的UE的IMSI和重定向指示信息，以使BSC或者RNC收到重新路由命令后，根据BSC或者RNC自身的策略为发送LAU请求消息的UE重新选择一个CS域的运营商，并将该LAU请求消息转发给所选择的CS域的运营商对应的一个MSC。
其中，对于GWCN架构的共享网络，可采用第一种可能的实现方式，MSC通过自身配置的策略为UE选择一个CS域的运营商，由于PS域，SGSN肯定会触发PS/CS协调流程，SGSN也会根据自身配置的策略为UE选择一个PS域的运营商，为UE重新分配一个P-TMSI，只要保证MSC和SGSN对同一个UE的策略一致性，则可以保证MSC和SGSN分别为UE重新选择的CS域运营商和PS域运营商会指向同一个运营商，使得UE在同一个运营商 的PS域和CS域注册，从而保证执行了SRVCC切换的UE的PS/CS协调；
对于MOCN架构的共享网络，可采用上述第二种可能的实现方式，MSC向BSC或者RNC返回包含UE的IMSI和重定向指示信息的重新路由命令，通过重定向指示信息告知BSC或者RNC该命令的目的是用于PS/CS协调，要求BSC或者RNC重新为用户选择一个CS域运营商，BSC或者RNC收到重新路由命令后，根据自身策略(如IMSI哈希法)为UE重新选择一个CS域的运营商网络进行注册，对于PS域，SGSN在收到RAU请求消息后，由于无法识别RAU中的P-TMSI，也会向BSC或者RNC发送包含UE的IMSI和重定向指示信息的重路由命令，使得BSC或者RNC根据自身策略为UE重新选择一个PS域的运营商网络进行注册，只要保证BSC或者RNC对同一个UE的策略一致性，则可以保证BSC或者RNC为UE重新选择的CS运营商和PS域运营商指向同一个运营商，使得UE在同一个运营商的PS域和CS域注册，从而保证执行了SRVCC切换的UE的PS/CS协调。
上述MSC，BSC或者RNC为UE重新选择一个CS域的运营商的具体实现过程，同现有技术，在此不再赘述。
本实施例，MSC接收UE发送的LAU请求消息，其中UE在该LAU请求消息中携带有该UE接收到的第一TMSI重分配消息中包括的TMSI网元，其中该TMSI网元中包括有不为共享网络中所有资源池中任何MSC所分配的NRI，MSC根据LAU请求消息中携带的NRI确定UE上报的TMSI不为自身所在资源池中的任何MSC所分配，进而触发PS/CS协调流程，为UE重新选择一个CS域的运营商，并将LAU请求消息转发给所选择的CS域的运营商对应的一个MSC，从而解决了现有技术中容易存在的MSC不一定触发PS/CS协调流程，而SGSN肯定会触发PS/CS协调流程，而容易导致PS/CS不协调的问题。
下面以MOCN架构共享网络为例，具体说明本发明实施例中涉及的各网络节点之间的信令交互过程，对于GWCN架构共享网络，其实现方式是类似的，具体不再赘述。
图3为本发明再一个实施例提供的PS/CS协调方法的信令交互图，该实施例以2G/3G网络侧的共享网络包括运营商A和运营商B，每个运营商分别有1个MSC资源池(pool)，分别为MSC pool A和MSC pool B，MSC pool A 中包括两个MSC，分别记作MSCA1，MSCA2以及MSC pool B中包括两个MSC，分别记作MSCB1，MSCB2，以及每个运营商至少有1个SGSN，分别记作SGSNA和SGSNB为例来说明该实施例的具体实施过程，对于其他数量的运营商，资源池以及每个资源池中包括的MSC的场景，其实现过程是类似的，不再赘述，该实施例还包括UE与源网络侧MME，以及接入网络中的BSC/RNC之间的信令交互，如图3所示，该实施例包括如下步骤：
步骤301、源网络侧的MME在MSCA1，MSCA2以及MSCB1，MSCB2中选择一个MSC作为目标MSC，向目标MSC发起SRVCC切换。
具体的，MME会根据MME与MSC之间的用于SRVCC的逻辑接口Sv情况和自身选择策略，向目标网络侧一个MSC服务器发起PS到CS(ps to cs)切换请求，该请求要求MSC为UE的到来做相应的准备操作和会话切换操作。该实施例中，以MME选择MSCA1作为目标MSC为例进行说明，对于MME选择共享网络中的其他MSC，其实现过程是类似的，具体不再赘述。
步骤302、MSCA1，在SRVCC过程中或后续SRVCC切换引起的语音通话过程中，向UE发送第二TMSI重分配消息，并且在该消息中携带有所述MSCA1为UE分配的一个TMSI和一个第二LAI。
步骤303、UE接收到第二TMSI重分配消息，保存所述TMSI作为自身临时标识，并根据第二LAI获取RPLMN。
步骤304、在SRVCC切换引起的语音通话结束时，MSCA1不立即释放UE的CS域信令连接，向UE发送第一TMSI重分配消息，在该消息携带有TMSI信元和一个第一LAI，该第一LAI为非广播的LAI，其中，在TMSI信元中包括一个NRI，该NRI可以为一个特殊的数字序列或者特殊字符，并且该NRI不为共享网络中所有资源池中的任何一个MSC所分配，也即该TMSI网元中包括的NRI不能被所有资源池中的任何一个MSC所识别，具体的，该NRI同实施例一，此处不再赘述。
步骤305、UE接收到第一TMSI重分配消息后，保存该第一LAI，并将该第一LAI与广播消息中接收到的LAI相比较，由于该第一LAI与广播消息中接收到的LAI肯定不同，UE确定满足触发LAU流程的条件，向接入网的BSC/RNC发送LAU请求消息，并且在该LAU请求消息携带上述第一TMSI重分配消息中包括的TMSI信元，其中该TMSI信元中包括上述NRI。
步骤306、BSC/RNC接收到UE发送的上述LAU请求消息，从该LAU请求消息中获取TMSI信元，对TMSI信元中的NRI进行识别，根据自身存储的NRI和运营商关系的映射表，查询此NRI对应的运营商，由于该NRI不为所有资源池中的任何MSC所分配，BSC/RNC查找不到对应的运营商，因此随机或者按照一定规则选择一个CS域的运营商，并将该LAU请求消息转发给所选择的运营商对应的一个MSC。
以所选择的运营商为运营商A，并将该LAU请求转发到MSCA1为例进行后续步骤的说明，对于选择的MSC为MSCA2或者运营商B中的一个MSC，其具体实现过程是类似的，不再赘述。
步骤307、MSCA1接收到BSC/RNC转发的LAU请求消息，根据上述NRI确定该UE上报的TMSI不为自身所在资源池中任意MSC所分配，则触发PS/CS协调流程，向BSC/RNC发送重路由命令，在该重路由命令中包括UE的IMSI和重定向指示信息。
步骤308、BSC/RNC接收到重路由命令后，根据UE的IMSI和自身策略为UE重新选择一个CS域的运营商。
步骤309、BSC/RNC将UE的LAU请求消息转发到所选择的CS域的运营商对应的一个MSC，以所选择的运营商为运营商B为例，则该LAU请求消息可以转发给MSCB1或者MSCB2，本实施例以转发给MSCB1为例，对于转发给所选择的运营商B包括的MSC资源池中的其他MSC其过程是类似的，具体不再赘述。
步骤310、UE触发路由区更新(Route Area Update，简称RAU)流程，向BSC/RNC发送一个RAU请求消息，并在该RAU请求消息中携带由MME所分配的GUTI映射而来的P-TMSI。
步骤311、BSC/RNC接收到UE发送的RAU请求消息后，由于该P-TMSI不是2G/3G网络侧的任何SGSN所分配，则随机选择一个SGSN，并将该RAU请求消息转发到该SGSN，以所选择的SGSN为SGSNA为例，对于所选择的SGSN为SGSNB，其实现过程是类似的，此处不再赘述。
步骤312、SGSNA接收到RAU请求消息后，由于该P-TMSI不是2G/3G网络侧的任何SGSN所分配，则触发PS/CS协调流程，向BSC/RNC发送重路由命令，在该重路由命令中包括UE的IMSI和重定向指示信息。
步骤313、BSC/RNC接收到重路由命令后，根据自身策略为UE重新选择一个PS域的运营商，对于同一UE，BSC/RNC采用相同策略为其选择CS域或PS域的运营商，因此可以保证为该UE所选择的PS域的运营商与CS域的运营商为同一个，则BSC/RNC为UE重新选择的PS域的运营商也为运营商B。
步骤314、BSC/RNC将RAU请求消息转发给为UE重新选择的SGSNB。
需说明的是，上述步骤305-309对应的LAU流程与上述步骤310-314对应的RAU流程的执行顺序可以是步骤305-309与步骤310-314同时执行，也可以是步骤305-309在步骤310-314之后执行，对此本发明不作限定。
图4为本发明一个实施例提供的MSC的结构示意图，如图4所示，该MSC 400，包括第一确定模块401，发送模块402，其中，
第一确定模块401，用于确定UE的语音通话为SRVCC切换引起的；
发送模块402，用于在第一确定模块401确定的由SRVCC切换引起的语音通话结束时，向UE发送第一TMSI重分配消息，该第一TMSI重分配消息中包括TMSI网元，其中该TMSI网元包括一个NRI，并且该NRI不为自身所在共享网络中所有MSC资源池中的任何MSC所分配，以使UE发送LAU请求消息时携带上述TMSI网元，进而使得接收到该LAU请求消息的MSC根据该LAU请求消息中TMSI网元包括的NRI触发PS/CS协调流程，为UE重新选择一个CS域的运营商。
在本发明的一个优选实施例中，上述第一TMSI重分配消息中还包括一个第一LAI，该第一LAI为非广播LAI，使得上述UE在接收到第一TMSI重分配消息后，保存该第一LAI，制造LAU触发条件，从而发起LAU流程。
在本发明提供的另一个优选实施例中，发送模块402还用于，在第一确定模块401确定的由SRVCC切换引起的语音通话过程中，向UE发送第二TMSI重分配消息，该第二TMSI重分配消息包括一个第二LAI。该第二LAI可以为一个广播的或者非广播的LAI，以使UE接收到第二TMSI重分配消息后，保存第二LAI，并根据第二LAI获取一个PLMN标识作为已注册的PLMN。
本发明实施例提供的MSC，可以用于执行图1所示的方法实施例中的技术方案，其实现原理和技术效果是类似的，具体不再赘述。
图5为本发明另一个实施例提供的MSC的结构示意图，该实施例中的 MSC 500，为图4所示MSC的一个扩展，以处理接收到的UE根据第一TMSI重分配消息发送的LAU请求消息，如图5所示，该MSC 500，还包括：
接收模块501，第二确定模块502，以及触发模块503，其中，
接收模块501，用于接收UE发送的LAU请求消息，该LAU请求消息中携带有UE接收到的上述第一TMSI请求消息中包括的TMSI网元；
第二确定模块502，用于根据上述TMSI网元中包括的NRI确定发送LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
触发模块503，用于触发PS/CS协调流程，为发送LAU请求消息的UE重新选择一个CS域的运营商。
进一步地，触发模块503具体用于：
触发PS/CS协调流程，根据自身配置策略为发送LAU请求消息的UE重新选择一个CS域的运营商，并将LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
可选的，触发模块503具体用于：
向BSC或者RNC发送重新路由命令，重新路由命令中包括发送LAU请求消息UE的IMSI和重定向指示信息，以使BSC或者RNC收到该重新路由命令后，根据BSC或者RNC自身的策略为发送LAU请求消息UE重新选择一个CS域的运营商，并将LAU请求消息发给所选择的运营商对应的一个MSC。
本实施例提供的MSC，可以用于执行图1，图2所示方法实施例中技术方案以及图3所示实施例中MSC对应部分的技术方案，其实现原理和技术效果是类似的，具体不再赘述。
图6为本发明又一个实施例提供的MSC的结构示意图，如图6所示，该MSC 600，包括：通过总线(如图中粗实线所示)连接的存储器601，处理器602和收发器603，其中，
存储器601存储程序代码，处理器602执行该程序代码，用于执行如下步骤：
确定UE的语音通话为SRVCC切换引起的；
调用收发器603，在确定的由SRVCC切换引起的语音通话结束时，向UE发送第一TMSI重分配消息，第一TMSI重分配消息中包括TMSI网元， 其中TMSI网元包括一个NRI，并且NRI不为自身所在共享网络中所有MSC资源池中的任何MSC所分配，以使UE发送LAU请求消息时携带TMSI网元，进而使得接收到LAU请求消息的MSC根据LAU请求消息中TMSI网元包括的NRI触发PS/CS协调流程，为UE重新选择一个CS域的运营商。
优选地，处理器602执行程序代码，还用于执行如下步骤：
在第一TMSI重分配消息中还包括一个第一LAI，其中第一LAI为非广播LAI，以使UE在接收到第一TMSI重分配消息后，保存第一LAI，触发LAU流程。
优选地，处理器602执行程序代码，还用于执行如下步骤：
在确定的由SRVCC切换引起的语音通话过程中，调用收发器603，向UE发送第二TMSI重分配消息，第二TMSI重分配消息包括一个第二LAI，以使UE接收到第二TMSI重分配消息后，保存第二LAI，并根据第二LAI获取一个PLMN标识作为已注册的PLMN。
进一步地，UE接收到第一TMSI重分配消息，向核心网MSC发送LAU请求消息时，本实施例中的处理器602执行程序代码，还用于执行如下步骤：
调用收发器603，接收UE发送的LAU请求消息，LAU请求消息中携带有UE接收到的第一TMSI请求消息中包括的TMSI网元；
根据TMSI网元中包括的NRI确定发送LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
触发PS/CS协调流程，为发送LAU请求消息的UE重新选择一个CS域的运营商。
进一步地，处理器602执行程序代码，具体用于执行如下步骤：
触发PS/CS协调流程，根据自身配置策略为发送LAU请求消息的UE重新选择一个CS域的运营商，并将LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
可选地，处理器602执行程序代码，具体用于执行如下步骤：
向BSC或者RNC发送重新路由命令，重新路由命令中包括发送LAU请求消息的UE的IMSI和重定向指示信息，以使BSC或者RNC收到重新路由命令后，根据BSC或者RNC自身的策略为发送LAU请求消息的UE重新选择一个CS域的运营商，并将LAU请求消息发给所选择的CS域的运营商对 应的一个MSC。
本实施例中的的MSC，可用于执行可以用于执行图1，图2所示方法实施例中技术方案以及图3所示实施例中MSC对应部分的技术方案，其实现原理和技术效果是类似的，具体不再赘述。
图7为本发明一个实施例提供的PS/CS协调***的结构示意图，如图7所示，该PS/CS协调***700，包括：MSC 701，UE 702，BSC 703或者RNC704，以及SGSN 705，其中MSC 701可以为图5或图6所示实施例中提供的MSC 500或者MSC 600，其实现原理和技术效果是类似的，具体不再赘述。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本发明可以用硬件实现，或固件实现，或它们的组合方式来实现。当使用软件实现时，可以将上述功能存储在计算机可读介质中或作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于：计算机可读介质可以包括RAM、ROM、EEPROM、CD-ROM或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质。此外。任何连接可以适当的成为计算机可读介质。例如，如果软件是使用同轴电缆、光纤光缆、双绞线、数字用户线(DSL)或者诸如红外线、无线电和微波之类的无线技术从网站、服务器或者其他远程源传输的，那么同轴电缆、光纤光缆、双绞线、DSL或者诸如红外线、无线和微波之类的无线技术包括在所属介质的定影中。如本发明所使用的，盘(Disk)和碟(disc)包括压缩光碟(CD)、激光碟、光碟、数字通用光碟(DVD)、软盘和蓝光光碟，其中盘通常磁性的复制数据，而碟则用激光来光学的复制数据。上面的组合也应当包括在计算机可读介质的保护范围之内。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (19)

  1. 一种分组交换PS/电路交换CS协调方法，其特征在于，包括：
    移动交换中心MSC确定用户设备UE的语音通话为单一无线语音呼叫连续性SRVCC切换引起的；
    所述MSC，在确定的由所述SRVCC切换引起的语音通话结束时，向所述UE发送第一临时移动用户标识TMSI重分配消息，所述第一TMSI重分配消息中包括TMSI网元，其中所述TMSI网元包括一个网络资源标识NRI，并且所述NRI不为所述MSC所在共享网络中所有MSC资源池中的任何MSC所分配，以使所述UE发送位置区更新LAU请求消息时携带所述TMSI网元，进而使得接收到所述LAU请求消息的MSC根据所述LAU请求消息中TMSI网元包括的所述NRI触发PS/CS协调流程，为所述UE重新选择一个CS域的运营商。
  2. 根据权利要求1所述的方法，其特征在于，所述第一TMSI重分配消息中还包括一个第一位置区标识LAI，其中所述第一LAI为非广播LAI，以使所述UE在接收到所述第一TMSI重分配消息后，保存所述第一LAI，并触发LAU流程。
  3. 根据权利要求1或2所述的方法，其特征在于，还包括：
    所述MSC，在确定的由所述SRVCC切换引起的语音通话过程中，向所述UE发送第二TMSI重分配消息，所述第二TMSI重分配消息包括一个第二LAI，以使所述UE接收到所述第二TMSI重分配消息后，保存所述第二LAI，并根据所述第二LAI获取一个公共陆上移动网络PLMN标识作为已注册的PLMN。
  4. 根据权利要求1至3任一项所述的方法，其特征在于，还包括：
    所述MSC接收UE发送的LAU请求消息，所述LAU请求消息中携带有所述UE接收到的所述第一TMSI请求消息中包括的所述TMSI网元；
    所述MSC根据所述TMSI网元中包括的所述NRI确定发送所述LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
    所述MSC触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商。
  5. 根据权利要求4所述的方法，其特征在于，所述MSC触发PS/CS协 调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商，包括：
    所述MSC触发PS/CS协调流程，根据自身配置策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
  6. 根据权利要求4所述的方法，其特征在于，所述MSC触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商，包括：
    所述MSC向基站控制器BSC或者无线控制中心RNC发送重新路由命令，所述重新路由命令中包括发送所述LAU请求消息的UE的国际移动用户标识符IMSI和重定向指示信息，以使所述BSC或者所述RNC收到所述重新路由命令后，根据所述BSC或者所述RNC自身的策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
  7. 一种移动交换中心MSC，其特征在于，包括：
    第一确定模块，用于确定用户设备UE正在进行的语音通话为单一无线语音呼叫连续性SRVCC切换引起的；
    发送模块，用于在所述第一确定模块确定的由所述SRVCC切换引起的语音通话结束时，向所述UE发送第一临时移动用户标识TMSI重分配消息，所述第一TMSI重分配消息中包括TMSI网元，其中所述TMSI网元包括一个网络资源标识NRI，并且所述NRI不为自身所在共享网络中所有MSC资源池中的任何MSC所分配，以使所述UE发送位置区更新LAU请求消息时携带所述TMSI网元，进而使得接收到所述LAU请求消息的MSC根据所述LAU请求消息中TMSI网元包括的所述NRI触发PS/CS协调流程，为所述UE重新选择一个CS域的运营商。
  8. 根据权利要求7所述的MSC，其特征在于，所述第一TMSI重分配消息中还包括一个第一LAI，其中所述第一LAI为非广播LAI，以使所述UE在接收到所述第一TMSI重分配消息后，保存所述第一LAI，并触发LAU流程。
  9. 根据权利要求7或8所述的MSC，其特征在于，所述发送模块还用 于：
    在所述第一确定模块确定的由所述SRVCC切换引起的语音通话过程中，向所述UE发送第二TMSI重分配消息，所述第二TMSI重分配消息包括一个第二LAI，以使所述确定的UE接收到所述第二TMSI重分配消息后，保存所述第二LAI，并根据所述第二LAI获取一个公共陆上移动网络PLMN标识作为已注册的PLMN。
  10. 根据权利要求7-9任一项所述的MSC，其特征在于，还包括：
    接收模块，用于接收UE发送的LAU请求消息，所述LAU请求消息中携带有所述UE接收到的所述第一TMSI请求消息中包括的所述TMSI网元；
    第二确定模块，用于根据所述TMSI网元中包括的所述NRI确定发送所述LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
    触发模块，用于触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商。
  11. 根据权利要求10所述的MSC，其特征在于，所述触发模块，具体用于：
    触发PS/CS协调流程，根据自身配置策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
  12. 根据权利要求10所述的MSC，其特征在于，所述触发模块，具体用于：
    向基站控制器BSC或者无线控制中心RNC发送重新路由命令，所述重新路由命令中包括发送所述LAU请求消息UE的国际移动用户标识符IMSI和重定向指示信息，以使所述BSC或者所述RNC收到所述重新路由命令后，根据所述BSC或者所述RNC自身的策略为发送所述LAU请求消息UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的运营商对应的一个MSC。
  13. 一种移动交互中心MSC，其特征在于，包括：
    通过总线连接的存储器，处理器和收发器；
    所述存储器存储程序代码，所述处理器执行所述程序代码，用于执行如 下步骤：
    确定用户设备UE的语音通话为单一无线语音呼叫连续性SRVCC切换引起的；
    调用所述收发器，在确定的由所述SRVCC切换引起的语音通话结束时，向所述UE发送第一临时移动用户标识TMSI重分配消息，所述第一TMSI重分配消息中包括TMSI网元，其中所述TMSI网元包括一个网络资源标识NRI，并且所述NRI不为自身所在共享网络中所有MSC资源池中的任何MSC所分配，以使所述UE发送位置区更新LAU请求消息时携带所述TMSI网元，进而使得接收到所述LAU请求消息的MSC根据所述LAU请求消息中TMSI网元包括的所述NRI触发PS/CS协调流程，为所述UE重新选择一个CS域的运营商。
  14. 根据权利要求13所述的MSC，其特征在于，所述处理器执行所述程序代码，还用于执行如下步骤：
    在所述第一TMSI重分配消息中还包括一个第一位置区标识LAI，其中所述第一LAI为非广播LAI，以使所述UE在接收到所述第一TMSI重分配消息后，保存所述第一LAI，触发LAU流程。
  15. 根据权利要求13或14所述的MSC，其特征在于，所述处理器执行所述程序代码，还用于执行如下步骤：
    在确定的由所述SRVCC切换引起的语音通话过程中，调用所述收发器，向所述UE发送第二TMSI重分配消息，所述第二TMSI重分配消息包括一个第二LAI，以使所述UE接收到所述第二TMSI重分配消息后，保存所述第二LAI，并根据所述第二LAI获取一个公共陆上移动网络PLMN标识作为已注册的PLMN。
  16. 根据权利要求13至15任一项所述的MSC，其特征在于，所述处理器执行所述程序代码，还用于执行如下步骤：
    调用所述收发器，接收UE发送的LAU请求消息，所述LAU请求消息中携带有所述UE接收到的所述第一TMSI请求消息中包括的所述TMSI网元；
    根据所述TMSI网元中包括的所述NRI确定发送所述LAU请求消息的UE上报的TMSI不为自身所属资源池中任意MSC所分配；
    触发PS/CS协调流程，为发送所述LAU请求消息的UE重新选择一个CS域的运营商。
  17. 根据权利要求16所述的MSC，其特征在于，所述处理器执行所述程序代码，具体用于执行如下步骤：
    触发PS/CS协调流程，根据自身配置策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
  18. 根据权利要求16所述的MSC，其特征在于，所述处理器执行所述程序代码，具体用于执行如下步骤：
    向基站控制器BSC或者无线控制中心RNC发送重新路由命令，所述重新路由命令中包括发送所述LAU请求消息的UE的国际移动用户标识符IMSI和重定向指示信息，以使所述BSC或者所述RNC收到所述重新路由命令后，根据所述BSC或者所述RNC自身的策略为发送所述LAU请求消息的UE重新选择一个CS域的运营商，并将所述LAU请求消息发给所选择的CS域的运营商对应的一个MSC。
  19. 一种分组交换PS/电路交换CS协调***，其特征在于，包括：如权利要求13至18任一项所述的移动交互中心MSC，用户设备UE，基站控制器BSC或者无线控制中心RNC，以及GPRS业务支撑节点SGSN。
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