WO2009089745A1 - Procédé et système de retour arrière s'appliquant au domaine de commutation de circuit afin d'établir un appel vocal - Google Patents

Procédé et système de retour arrière s'appliquant au domaine de commutation de circuit afin d'établir un appel vocal Download PDF

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Publication number
WO2009089745A1
WO2009089745A1 PCT/CN2008/073775 CN2008073775W WO2009089745A1 WO 2009089745 A1 WO2009089745 A1 WO 2009089745A1 CN 2008073775 W CN2008073775 W CN 2008073775W WO 2009089745 A1 WO2009089745 A1 WO 2009089745A1
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WIPO (PCT)
Prior art keywords
voice call
cell
user terminal
circuit switched
indication
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PCT/CN2008/073775
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English (en)
Chinese (zh)
Inventor
Jiyong Wang
Yongjun Yu
Yang Zhao
De Chen
Xiaobo Wu
Xiaoqin Duan
Jian Zhang
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to BR122015026582-7A priority Critical patent/BR122015026582B1/pt
Priority to BRPI0821669A priority patent/BRPI0821669B1/pt
Publication of WO2009089745A1 publication Critical patent/WO2009089745A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to the field of communications, and more particularly to a method and system for backing up to a circuit switched domain to establish a voice call.
  • 2G/3G Second Generation Mobile Communication Technology / Third Generation Mobile Communication Technology
  • SAE System Architecture Evolution
  • LTE Long Term Evolution
  • HSPA High-Speed Packet Access
  • HSPA+ High-speed Packet Access Evolution
  • WiMAX Worldwide Interoperability for Microwave Access
  • voice calls for mobile communication can be classified into the following categories:
  • the first type is a session type service carried by a CS (Circuit Switching) domain, such as a voice call;
  • CS Circuit Switching
  • the second type is the session-type service carried by the PS domain, also known as VoIP (voice over Internet Protocol)-based services.
  • QoS Quality of Service
  • IMS IP Multimedia Subsystem
  • voice calls can only be transmitted on their PS domain bearers, and IMS controls voice calls over IP-based networks.
  • voice calls are typically carried on the CS domain.
  • the user who initiates the call may span the two networks during a call. Due to the different bearer mechanisms of the mobile communication service, when the UE (User Equipment) moves out of the pure PS domain (eg, SAE/LTE), the network base station Coverage, when entering the 2G/3G network base station coverage area, Intermittent IMS voice calls can occur, thereby affecting the continuity of the user's voice call.
  • the UE User Equipment
  • the pure PS domain eg, SAE/LTE
  • the network base station Coverage when entering the 2G/3G network base station coverage area, Intermittent IMS voice calls can occur, thereby affecting the continuity of the user's voice call.
  • SRVCC Single Radio Voice Call Continuity technology solution
  • CS over PS PS-bearing CS
  • Redirection redirection
  • SRVCC technical solution requirements Deploy IMS; need a gateway node responsible for PS and CS signaling conversion or the network itself supports PS switching, DTM (Dual Transfer Mode).
  • the CS over PS technology solution currently has an eMSC (evolved Mobile Switching Center) solution and a Page in LTE (LTE paging), call in 2G/3G ( 2 G/3G call setup) scheme.
  • eMSC evolved Mobile Switching Center
  • LTE Long Term Evolution
  • 2G/3G 2 G/3G call setup
  • the eMSC solution requires the deployment of eMSC.
  • call in 2G/3G scheme is based on the update process of TA (Tracking Area) / LA (Location Area) combination, and LA update is triggered during TA update.
  • the paging messages of all called voice calls are from the 2G/3G MSC (Mobile Switching Center).
  • the paging message is forwarded by the MSC to the MME (Mobility Management Entity), and then sent by the MME to the evolved Node B (eNB).
  • the eNB does not continue to deliver, but It is switched to a 2G/3G network through PS switching, and a call is established in the CS domain of the 2G/3G network.
  • Page in LTE call in 2G/3G scheme requirements:
  • the network supports PS handover and DTM; TA/TA list and LA restricted mapping relationship, that is, one TA/TA list cannot span two or more MSCs.
  • Administered LA In the early deployment phase of LTE, IMS may not be deployed, and most GSM networks do not support PS switching and DTM. Moreover, the limited mapping relationship between TA/TA list and LA limits the flexibility of LTE deployment. Therefore, the prior art cannot solve the IMS voice when the UE moves out of the PS domain (for example, the coverage area of the SAE/LTE network base station) and enters the cell with the CS domain (for example, the 2G/3G network base station coverage area). The discontinuity of the call results in a technical problem that affects the continuity of the user's voice call.
  • Embodiments of the present invention provide a method and system for establishing a voice call back to a circuit switched domain, which can improve the continuity of a user's voice call when a user terminal moves out of a cell with a packet switched domain and enters a cell with a circuit switched domain.
  • An embodiment of the invention provides a method for establishing a voice call back to a circuit switched domain, the method comprising:
  • the network side sends an indication to the user terminal to establish a voice call to the circuit switched domain, the indication is used to indicate that the user terminal reselects a cell with a circuit switched domain when initiating a voice call according to the indication, and in the cell
  • the circuit switched domain establishes a voice call.
  • Another embodiment of the present invention further provides a method for establishing a voice call back to a circuit switched domain, including:
  • the evolved node receives the voice call paging message sent by the mobile switching center through the preset logical function entity and the mobility management entity;
  • a further embodiment of the present invention further provides a system for backing up to a circuit switched domain to establish a voice call, including:
  • a network side configured to send, to the user terminal, an indication that the voice call is established to the circuit switched domain; the indication is used to instruct the user terminal to initiate a voice call according to the indication, and reselect the cell with the circuit switched domain, and A circuit switched domain of the cell establishes a voice call.
  • Still another embodiment of the present invention provides a system for backing up a circuit call to establish a voice call, including:
  • Parsing and processing the received voice call paging message generating a cell change command; sending the cell change command to the user terminal, to instruct the user terminal to change according to the cell
  • the variable command is reselected to the target cell with the circuit switched domain, and a voice call is established in the circuit switched domain of the target cell.
  • the technical effect of the embodiment of the present invention is: sending an indication to the user terminal through the network, the user terminal reselecting to the cell having the circuit switched domain; and establishing a voice call in the circuit switched domain of the cell.
  • the discontinuity of the IMS voice call causes a technical problem that affects the continuity of the user's voice call.
  • FIG. 1 is a system architecture of a solution A according to an embodiment of the present invention
  • FIG. 3 is a structure and a flowchart of a TA update process triggering and completing an LA update in the scenario B of the first embodiment of the present invention
  • FIG. 4( a ) and FIG. 4 ( b ) are diagrams showing a structure and a flow chart of the network of the second embodiment of the present invention indicating whether the UE voice call is transferred to the CS domain of the 2G/3G cell;
  • FIG. 5 is a flowchart of establishing a calling voice call by a UE reselecting to a 2G/3G cell according to Embodiment 3 of the present invention
  • FIG. 6 is a cell change of an LTE network that does not support network control according to Embodiment 4 of the present invention, where the UE reselects
  • FIG. 7 is a flowchart of a cell change control UE to a 2G/3G cell to establish a calling voice call according to Embodiment 4 of the present invention
  • FIG. 8 is a flowchart of establishing a called voice call by a UE autonomously reselecting to a 2G/3G cell according to Embodiment 5 of the present invention
  • FIG. 10 is a flowchart of establishing a called voice call by a UE that reselects to a 2G/3G cell by using a VMSC-R as a back-to-back CS proxy mode according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a system for establishing a voice call back to a CS domain according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of another system for establishing a voice call back to the CS domain according to an embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a system for implementing a called flow according to an embodiment of the present invention. detailed description
  • the UE when the UE is in the coverage of the LTE network, the UE registers the CS domain with the virtual LA, so that the UE can still receive the voice call of the CS domain when the UE camps on the LTE network.
  • the virtual LA area is approximately equivalent to the area of LA at the same physical location 2G/3G. Since the LA of the 2G/3G is composed of 2G/3G cells, and the virtual LA area for the LTE network is composed of LTE cells, when the UE camps on the LTE network, the virtual LA area composed of the LTE cells and the same location area are composed of The LA regions composed of 2G/3G cells do not completely overlap.
  • the UE When the UE camps on the LTE network, one MSC is selected according to the virtual LA area composed of the LTE cells. However, the UE falls back to the 2G/3G cell, and the 2G/3G cell may belong to another LA, so that the UE may select another MSC.
  • Scenario A needs to upgrade the MSC to support sending a voice call paging message to the MME.
  • Solution B adds a Mobility proxy (mobile function entity) responsible for forwarding LA update and voice call paging messages between the MSC and the MME.
  • Mobility proxy mobile function entity
  • the Mobility proxy is a BSS (Base Station System) / RNS (Radio Network Subsystem), and all LAs that are mapped to the TA/TA list contain this Mobility.
  • the proxy simulates the BSS/RNS, and these TA/TA lists belong to the MME connected to the Mobility proxy.
  • the MSC can perform LA update and send voice call paging messages according to standard procedures. If the UE wants to reselect the 2G/3G cell to establish the called voice call, the two methods are required to forward the voice call paging message. If the UE wants to reselect the 2G/3G cell to establish the calling voice call, The above two schemes are not required to forward the voice call paging message.
  • the system architecture of these two schemes is shown in Figure 1 and Figure 2.
  • each LTE cell (the cell of the pure PS domain) has its corresponding TA/TA list and LA, and each LA to be updated by the Mobility proxy includes the BSS simulated by the Mobility proxy. /RNS, so that the LA update and the voice call paging message can be forwarded to the UE via the LTE network without modifying the GSM protocol specification.
  • the interface between the Mobility proxy and the MME is S3, (simplified S3 interface, only LA update and paging messages are transmitted), when the UE switches from the SAE/LTE network to the 2G/3G network or when it is from the 2G/3G network to the SAE/ When the LTE network is switched, all the switching is eliminated.
  • the information is passed through the Mobility proxy, Mobility proxy—directly on the path of the S3 interface.
  • the interface between the Mobility proxy and the MME can also be an interface similar to GS, (Gs like, simplified Gs interface, only transmitting LA update and paging messages).
  • VMSC-R that is, the registered VMSC (Visit Mobile Switching Center), the last LA update of the UE in the LTE network is This VMSC.
  • VMSC-R that is, the registered VMSC (Visit Mobile Switching Center)
  • VMSC-S the last LA update of the UE in the LTE network is This VMSC.
  • the VMSC-S that is, the serving VMSC (Voice Call Service Visiting Mobile Switching Center), after the UE reselects to the 2G/3G cell, the voice call is established through the VMSC (Visit Mobile Switching Center) and acts as an anchor MSC (anchor MSC).
  • VMSC Voice Call Service Visiting Mobile Switching Center
  • anchor MSC anchor MSC
  • the cell change of the UE (including the CS domain, including the CS domain unless otherwise specified) can be notified to the UE by broadcast system information or dedicated signaling.
  • broadcast system information notification method cell changes of all UEs in the cell are controlled by the network.
  • dedicated signaling such as handover messages, measurement control messages, cell change/update messages, paging messages, etc., it can be achieved that the cell change notifying the specific UE is controlled by the network.
  • Embodiment 1 In order to reduce the delay of the UE from reselecting the LTE cell to the 2G/3G cell and establishing a voice call, a method of triggering and updating the LA in the TA update process is adopted. Both scheme A and scheme B do not require a restricted mapping relationship between TA/TA list and LA. For scenario A, the implementation method is similar to the prior art. For scenario B, the LA update message is forwarded by the Mobility proxy between the MME and the MSC. From the perspective of the MSC, the BSS/RNS simulated by the Mobility proxy is included in the LA, and the update process of TA and LA is shown in FIG. 3.
  • the UE determines whether to perform the LA update according to the trigger condition of the LA, and if the LA update is required in the process of the TA update.
  • the message exchange between the MME and the Mobility is through the S3, the interface, the interaction between the VMSC-R and the Mobility proxy through the simplified A/Iu interface (the interface only transmits the message of the LA update process and the voice call). Call the message).
  • the advantage of the scheme B is that the modification of the existing 2G/3G standard specification is avoided due to the addition of the logic function Mobility proxy.
  • Embodiment 2 A UE camping in an LTE cell broadcasts a system message or a dedicated signaling The message is notified whether the voice call of the cell is transferred to the CS domain of the 2G/3G cell to establish a voice call. If yes, both the calling and the called voice call are transferred to the CS domain of the 2G/3G cell. As shown in FIG. 4( a ), the method for notifying the system information of the broadcast causes the voice calls of all UEs in the LTE cell to be transferred to the 2G/3G cell or not transferred.
  • a dedicated signaling manner such as a handover message, a measurement control message, a cell change/update message, a paging message, etc., may be used to notify a specific UE to transfer a voice call to a CS domain of 2G/3G. Establish a voice call or not reselect.
  • Embodiment 3 The UE camps in the LTE cell, and the UE initiates a voice call of the calling party, according to an indication obtained by the system message or the dedicated signaling that was previously broadcasted, whether the voice call is established to the CS domain of the 2G/3G cell, Decide whether to transfer to a 2G/3G cell.
  • the LTE-IDLE state UE establishes the calling voice call in the CS domain of the 2G/3G cell, as shown in FIG. 5, and specifically includes the steps:
  • the UE initiates a calling voice call in the LTE-IDLE state.
  • the previously broadcasted system message or dedicated signaling indicates that the voice call is to be established to the CS domain of the 2G/3G cell, the UE reselects to the 2G/3G cell, monitors the 2G/3G cell broadcast message and camps on the cell.
  • the normal LA update process is first performed.
  • the UE initiates a process of establishing a calling voice call in a CS domain of the 2G/3G cell.
  • Embodiment 4 Decide whether to reselect to a 2G/3G cell according to an indication obtained by a system message or dedicated signaling previously broadcasted whether the voice call is established to the CS domain of 2G/3G.
  • the LTE network supports network-controlled cell change (ie, NACC (Network-Assisted Cell Change) to GERAN (GSM/EDGE Radio Access Network GSM/EDGE Radio Access Network) and to UTRAN (Universal Terrestrial) Inter-RAT cell order of the Radio Access Network
  • NACC Network-Assisted Cell Change
  • GERAN GSM/EDGE Radio Access Network
  • UTRAN Universal Terrestrial
  • Inter-RAT cell order of the Radio Access Network the UE in the LTE-AC state establishes the calling voice call in the CS domain of the 2G/3G cell.
  • the process is shown in Figure 6 and Figure 7, respectively.
  • Figure 6 shows a cell change in which the LTE network does not support network control, and the UE reselects to the 2G/3G cell to establish a calling voice call. Including steps:
  • the UE When the UE is in the LTE-Active state, the UE initiates a calling voice call.
  • the previously broadcast system message or dedicated signaling indicates that the voice call is to be established to 2G/3G.
  • the CS domain and the UE learns that the LTE network does not support the network control cell change, the UE autonomously reselects to the 2G/3G cell, monitors the broadcast message of the 2G/3G cell and camps on the cell.
  • the normal LA update process is first performed.
  • the UE initiates a process of establishing a calling voice call in a CS domain of the 2G/3G cell.
  • FIG. 7 shows the LTE network supporting the network control of the cell change.
  • the LTE network commands the UE to reselect the 2G/3G cell to establish the calling voice call. Including steps:
  • the UE initiates a calling voice call in the LTE-AC state.
  • the previously broadcasted system information or dedicated signaling indicates that the voice call is to be established to the CS domain of 2G/3G, and the UE learns that the LTE network supports the cell change controlled by the network.
  • the UE notifies the LTE network to initiate a calling voice call, and the LTE network commands the UE to reselect the 2G/3G cell, and carries the information of the target cell in the command message.
  • the normal LA update process is performed first.
  • the UE initiates a process of establishing a calling voice call in a CS domain of the 2G/3G cell.
  • Embodiment 5 For the called voice call, whether or not to reselect to the 2G/3G cell is determined according to an indication obtained by the system message or the dedicated signal previously broadcasted whether the voice call is established to the CS domain of the 2G/3G cell.
  • the paging message of the called voice call may be sent to the MME according to the foregoing scheme A: directly through the Gs like interface; or may be located in the foregoing scheme B: the paging message is first sent to the Mobility proxy through the simplified A/Iu interface, and then the Mobility The proxy then forwards it to the MME via the S3 'interface.
  • FIG. 8 is a flowchart of establishing a called voice call by the UE autonomously reselecting to a 2G/3G cell. Specifically, the steps are as follows:
  • the VMSC-R sends a voice call paging message to the MME through the Gs-like interface.
  • the paging message is sent to the MME through two steps 81a and 81b. 81a.
  • the Mobility proxy forwards the voice call paging message to the S3' interface to
  • the UE receives a voice call paging message from the network side.
  • the voice call is transferred to the CS domain of the 2G/3G, reselected to the 2G/3G cell, and the system message broadcasted by the cell is monitored and camped on the target cell.
  • the LA of the target cell triggers the normal LA update process
  • the LA is updated.
  • the updated LA belongs to the VMSC-R.
  • the VMSC-R is the same as the VMSC-S. Go to step 85.
  • the LA of the target cell triggers a normal LA update process
  • the LA is updated.
  • the updated LA belongs to the VMSC-S.
  • the VMSC-R is different from the VMSC-S, and the process goes to step 85a.
  • the UE may send a paging corresponding message to the network side in the 2G/3G cell.
  • the VMSC-R is the same as the VMSC-S, and the voice call is established in the CS domain of the 2G/3G cell using the normal called voice call procedure.
  • the UE may send a paging corresponding message to the network side in the 2G/3G cell.
  • VMSC-R is different from VMSC-S in that it is established in the CS domain of 2G/3G using the MT roaming retry call method or the B2B CS UA method (back-to-back circuit switched proxy mode, which is described in the seventh embodiment).
  • Embodiment 6 For a called voice call, it is decided whether to reselect to a 2G/3G cell based on an indication obtained by the previously broadcasted system information or a dedicated signal whether the voice call is established to the CS domain of the 2G/3G cell. Moreover, the LTE network indicates that it supports network controlled cell changes. After receiving the voice call paging message, the UE transfers to the 2G/3G cell by the network control, and then the called voice call is established in the CS domain of the 2G/3G cell.
  • FIG. 9 is an LTE network control UE reselecting to a 2G/3G cell Establish a called voice call, including the steps:
  • the VMSC-R sends a paging message of the voice call to the MME through the Gs like interface. If, according to scenario B, a paging message is sent to the MME through two steps 91a and 91b.
  • the mapping relationship between the TA/TA list and the LA is configured in each LTE cell, and the LA that is updated by the Mobility proxy to the VMSC-R includes the Mobility proxy virtual
  • the Mobility proxy forwards the voice call paging message to the MME through the S3' interface.
  • the MME sends a paging message of the voice call to the eNB (evolved base station).
  • the eNB After the eNB parses the paging message and processes the packet, the eNB sends the message to the UE.
  • the voice call is to be established to the CS domain of the 2G/3G cell according to the system information or the dedicated signaling previously broadcasted, and the network supports the cell control of the network change.
  • the eNB waits for the eNB to send a cell change command, and then the UE reselects to the 2G/3G cell designated by the network and camps on the target cell.
  • the LA of the target cell triggers the normal LA update process
  • the LA is updated.
  • the updated LA 3 ⁇ 4 is in the VMSC-R, in which case the VMSC-R is the same as the VMSC-S, and the process goes to step 96.
  • the LA of the target cell triggers the normal LA update process
  • the LA is updated.
  • the updated LA belongs to the VMSC-S.
  • the VMSC-R is different from the VMSC-S, and the process proceeds to step 96a.
  • the UE may send a paging corresponding message to the network side in the 2G/3G cell.
  • the VMSC-R is the same as the VMSC-S, and the voice call is established in the CS domain of the 2G/3G cell using the normal called voice call procedure.
  • the UE may send a paging corresponding message to the network side in the 2G/3G cell.
  • VMSC-R uses the MT roaming retry call method or the B2B CS UA method to establish the voice call in the CS domain of the 2G/3G cell.
  • Embodiment 7 For a called voice call, the UE decides whether to reselect to a 2G/3G cell according to an indication obtained by the previously broadcasted system information or dedicated signaling whether the voice call establishes a CS domain to the 2G/3G cell.
  • the process of sending the called voice call paging message from the VMSC-R to the MME is the same as the UE in the LTE-IDLE state.
  • the LTE network does not support network-controlled cell change, that is, to NACC (including system information for the CS domain, and the UE can perform network control in both LTE-IDLE and LTE-Active states)
  • NACC including system information for the CS domain, and the UE can perform network control in both LTE-IDLE and LTE-Active states
  • the cell in the LTE-active state is received by the UE in the LTE-Active state after receiving the called voice call paging message from the UE in the LTE-Active state.
  • the called voice calls the paging message it is transferred to the 2G/3G cell by the network control, and then the called voice call is established in the CS domain of the 2G/3G cell, as shown in FIG.
  • FIG. 10 is a flowchart of the LTE network control of the VMSC-R as the back-to-back CS proxy mode.
  • the UE reselects to the 2G/3G cell to establish a called voice call flow diagram, which specifically includes the steps:
  • the UE is currently in an LTE network, and the VMSC-R (ie, eMSC) serves the UE.
  • the GMSC Gateway Mobile Switching Center
  • HLR Home Location Register
  • MSRN Mobile Station Roaming Number
  • the GMSC sends an IAM (Initial Address Message) message to the VMSC-R according to the MSRN.
  • IAM Initial Address Message
  • the VMSC sends a paging message to the UE through the LTE network.
  • the UE After receiving the paging message, the UE indicates that the voice call is to be established to the CS domain of the 2G/3G cell according to the system information or the dedicated signaling that is previously broadcasted, and the network where the UE is located supports the cell control network change. Waiting for the cell change command sent by the eNB, after which the UE reselects to the network designated
  • the 2G/3G cell camps on the target cell.
  • the UE accesses the 2G/3G target cell to trigger the normal LA update process, and LA is updated, and the updated LA 3 ⁇ 4 is in the VMSC-R. If the VMSC-R is the same as the VMSC-S, the UE sends a paging response message to the network side in the 2G/3G cell, and establishes the voice call in the CS domain of the 2G/3G using the normal called voice call procedure.
  • step 110 If the VMSC-R is different from the VMSC-S, go to step 110.
  • the HLR After receiving the LAU (Location Area Update) update request message of the UE, the HLR sends a Cancel Location message to the VMSC-R, and the VMSC-R sends a corresponding Cancel Location ACK (Cancel Location Area Response message). Give the HLR. At the same time, the VMSC-R stops the paging timer.
  • LAU Location Area Update
  • the VMSC-R stops the paging timer.
  • VMSC-R queries the HLR for information such as MSRN. 115. After the LAU update of the UE is successful, the HLR sends a PRN (Provide Roaming Number) query message to the VMSC-S.
  • PRN Provide Roaming Number
  • the VMSC-R obtains an MSAM message according to the query to send an IAM message to the VMSC-S.
  • the VMSC-S may need to wait for the LAU process to complete before the call process can be initiated.
  • the network and the UE perform the normal called process.
  • the user plane of the UE's call can be directly from the GMSC to the VMSC-S.
  • the above method is equally applicable to the following scenario of any network:
  • the UE is processing the called process, and the network server that processes the called process changes.
  • the MSC changes due to a change in LA, and the call occurs abnormally.
  • the method for establishing a voice call back to the CS domain and the method for configuring the LA/TA list and the TA corresponding to the method for establishing a voice call back to the CS domain and the method for implementing the called flow are described in detail.
  • the embodiment of the invention further provides a system for establishing a voice call back to the CS domain and a system for implementing the called process.
  • Figure 11 is a system for establishing a voice call back to the CS domain according to an embodiment of the present invention.
  • the system includes:
  • the first indication unit 131 sends a first indication to the UE; the first indication unit sends a first indication that the UE voice call camping in the cell is established to the CS domain by using a system message broadcast by the cell; or by using a dedicated signaling message Transmitting a first indication that a UE camping within the cell establishes a voice call to the CS domain;
  • the reselecting unit 132 reselects the UE to the cell with the CS domain according to the first indication of the voice call setup;
  • the voice call establishing unit 133 is configured to establish the voice call by the UE in the CS domain of the cell.
  • system further includes a second indication unit 134, which provides support for establishing a voice call to A second indication of the network-controlled cell change of the cs domain.
  • a third indication receiving unit 135, configured to receive a third indication of establishing a voice call of the voice call paging message, where the paging message is from the network, or
  • the system includes:
  • the MSC 136 sends a voice call paging message to the logical function entity Mobility proxy 137 through the first interface;
  • the logical function entity Mobility proxy 137 the received voice call paging message is sent to the MME 138 through the second interface;
  • the MME 138 the voice call paging message is sent to the eNB 139;
  • the eNB 139 receives and parses and processes the paging message, and sends the paging message to the UE 140. Specifically, the method includes: if the network where the UE 140 camps indicates that the network control for establishing the voice call to the CS domain is changed, the eNB 139 Transmitting a cell change command according to the voice call paging message;
  • the UE 140 reselects to the cell having the CS domain according to the cell change command, and camps on the target cell.
  • the triggering update unit 141 the LA for the target cell triggers a normal LA update process, and performs LA update;
  • the UE 140 transmits a paging response message to the network side in the cell having the CS domain, and establishes the voice call in the CS domain of the cell having the CS domain.
  • the UE 140 establishes a called voice call by using the B2B CS UA method, or establishes a called voice call by using a B2B CS UA method (back-to-back CS proxy mode, which is introduced in Embodiment 7).
  • an embodiment of the present invention further provides a system for implementing a called process.
  • the method includes:
  • the first network server 142 provides a service of the called session of the UE
  • the second network server 143 in processing the called session, is configured to register the UE 144 with the network, and notify the first network server to cancel the registration information of the UE 144, and then initiate a called flow to the UE 144.
  • the called process is in a CS network
  • the first network server is an MSC mobile switching center
  • the second network server is a home location server HLR. Or the home subscriber subscription server HSS.
  • the above method and system for implementing the called flow and the method for configuring the correspondence between the LA/TA list and the TA are not limited to the application of the present invention, and may be applied to other occasions.

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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de retour arrière s'appliquant au domaine de commutation de circuits pour établir un appel vocal. Le procédé est le suivant: le còté réseau envoie à l'équipement utilisateur une indication pour établir un appel vocal dans le domaine de commutation de circuits, l'indication étant utilisée pour indiquer à l'équipement utilisateur de resélectionner une cellule possédant le domaine de circuit de commutation alors qu'un appel vocal est déclenché conformément à l'indication, et l'appel vocal est établi dans le domaine de commutation de circuits de la cellule. La présente invention concerne également le système de retour arrière s'appliquant au domaine de commutation de circuits pour établir un appel vocal, ce qui permet de réaliser la continuité de l'appel vocal de l'utilisateur lorsque l'équipement utilisateur se déplace en dehors d'une cellule possèdant le domaine de commutation de paquets et à l'intérieur d'une cellule possédant le domaine de commutation de circuits.
PCT/CN2008/073775 2007-12-29 2008-12-26 Procédé et système de retour arrière s'appliquant au domaine de commutation de circuit afin d'établir un appel vocal WO2009089745A1 (fr)

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BR122015026582-7A BR122015026582B1 (pt) 2007-12-29 2008-12-26 Método e sistema para fallback de domínio de comutação de circuitos para estabelecer chamada de voz
BRPI0821669A BRPI0821669B1 (pt) 2007-12-29 2008-12-26 método e sistema para fallback de domínio de comutação de circuitos para estabelecer chamada de voz

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CN200710307877 2007-12-29
CN200710307877.5 2007-12-29

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CN107431999B (zh) * 2015-03-18 2021-04-09 瑞典爱立信有限公司 用于寻呼的装置和方法
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CN109451549B (zh) * 2019-01-03 2021-09-14 中国联合网络通信集团有限公司 语音回退方法、装置与终端设备

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CN113810419A (zh) * 2016-11-09 2021-12-17 联发科技股份有限公司 增强多媒体呼叫控制的方法及其基站和用户设备
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CN113630831A (zh) * 2021-09-16 2021-11-09 中国联合网络通信集团有限公司 小区回落方法、终端和网络侧设备

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CN101472349A (zh) 2009-07-01
BRPI0821669A2 (pt) 2015-06-16
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CN102149156A (zh) 2011-08-10
CN102149156B (zh) 2014-12-17
CN101472349B (zh) 2011-06-01

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