WO2014067166A1 - 一种回归长期演进lte网络的方法、设备及系统 - Google Patents

一种回归长期演进lte网络的方法、设备及系统 Download PDF

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Publication number
WO2014067166A1
WO2014067166A1 PCT/CN2012/084106 CN2012084106W WO2014067166A1 WO 2014067166 A1 WO2014067166 A1 WO 2014067166A1 CN 2012084106 W CN2012084106 W CN 2012084106W WO 2014067166 A1 WO2014067166 A1 WO 2014067166A1
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WO
WIPO (PCT)
Prior art keywords
plmn
lte
frequency band
network
cell
Prior art date
Application number
PCT/CN2012/084106
Other languages
English (en)
French (fr)
Inventor
舒林
吴晓波
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CA2890001A priority Critical patent/CA2890001A1/en
Priority to CN201280018639.1A priority patent/CN104025665B/zh
Priority to MX2015005634A priority patent/MX2015005634A/es
Priority to EP12887406.2A priority patent/EP2916593A4/en
Priority to BR112015010029A priority patent/BR112015010029A2/pt
Priority to PCT/CN2012/084106 priority patent/WO2014067166A1/zh
Priority to RU2015121399A priority patent/RU2015121399A/ru
Publication of WO2014067166A1 publication Critical patent/WO2014067166A1/zh
Priority to US14/703,403 priority patent/US20150237536A1/en
Priority to ZA2015/03196A priority patent/ZA201503196B/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control 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]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/30Connection release
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/18Selecting a network or a communication service
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06Registration at serving network Location Register, VLR or user mobility server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/06Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • H04W88/10Access point devices adapted for operation in multiple networks, e.g. multi-mode access points

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for returning to a Long Term Evolution (LTE) network after a Circuit Switched Fallback (CSFB) service ends.
  • LTE Long Term Evolution
  • CSFB Circuit Switched Fallback
  • Circuit Service (CS) network is a wireless network that provides circuit domain services such as voice calls. For example, coverage of 2G/3G wireless networks such as GSM and WCDMA is very common.
  • PS Packet Service
  • LTE Long Term Evolution
  • the 3rd Generation Partnership Project (3GPP) organization proposed the "CS Fallback" (CSFB) technology to enable user equipment (User Equipment, UE) registered to the LTE network.
  • CSFB CS Fallback
  • the existing protocol also defines a CSFB regression mechanism to ensure that the UE can return to the PS domain network for PS services after completing the CS voice call, which specifically includes: The MSC/VLR releases the connection established by the CS voice call.
  • the base station instructs the UE to reselect the LTE frequency band information of the LTE network, so that the UE redirects to the appropriate cell on the LTE frequency band information, and then randomly reselects.
  • Entering an LTE public land mobile network in the appropriate cell broadcast information Public Land Mobile Network, PLMN).
  • the UE may be in the LTE network coverage of multiple different PLMNs, for example, the UE registered LTE before the CSFB.
  • the embodiments of the present invention provide a method, a device, and a system for reverting to an LTE network, so that the UE can return to the LTE PLMN registered before the CSFB after the CSFB service ends, ensuring the continuity of the PS service, and avoiding unnecessary PLMN inter-network handover. , enhance the user experience.
  • a method for regressing a Long Term Evolution (LTE) network comprising:
  • the base station learns that the circuit domain of the user equipment UE falls back to the end of the CSFB service;
  • connection release message including the LTE frequency band information
  • the base station learns that the circuit domain fallback CSFB service of the user equipment UE ends, and includes: receiving, by the serving MSC/VLR, a connection release including the CSFB indication Message.
  • the serving MSC/VLR is the MSC/VLR registered by the UE, the serving MSC/VLR is from the Obtaining, in the registration information of the UE, a PLMN ID of the LTE network registered by the UE;
  • the serving MSC/VLR is not the MSC/VLR registered by the UE, the PLMN ID of the LTE network registered by the UE is sent by the MSC/VLR registered by the UE to the serving MSC/VLR 0.
  • the connection release message including the LTE frequency band information further includes the PLMN ID.
  • a second aspect of the present invention provides a method for regressing an LTE network, where the method includes: receiving, by a user equipment, a connection release message including LTE frequency band information sent by a base station; camping on a frequency band specified by the LTE frequency band information The cell selects an LTE PLMN corresponding to the public land mobile network PLMN identity ID included in the system broadcast information of the cell.
  • the system broadcast information of a suitable cell in the specified frequency band of the LTE frequency band information includes only one PLMN ID, and the system broadcast information of the cell is selected.
  • the LTE PLMN corresponding to the included PLMN ID includes:
  • the connection release message further includes a PLMN ID of the LTE network that is registered by the UE, and the system broadcast information included in the cell is selected.
  • the LTE PLMN corresponding to the PLMN ID includes:
  • a third aspect of the present invention provides a method for regressing an LTE network, where the method includes: receiving, by a user equipment, a connection release message including LTE frequency band information sent by a base station; camping on a frequency band specified by the LTE frequency band information Community
  • a base station including:
  • a learning unit configured to learn that the circuit domain fallback CSFB service of the user equipment UE ends
  • a receiving unit configured to receive the public land mobile network of the UE-registered Long Term Evolution (LTE) network that is sent by the serving mobile switching center/visiting location register MSC/VLR PLMN identification ID;
  • LTE Long Term Evolution
  • a determining unit configured to determine LTE frequency band information according to the PLMN ID received by the receiving unit
  • a sending unit configured to send, to the UE, a connection release message that includes the LTE frequency band information determined by the determining unit.
  • the learning unit is specifically configured to: receive a connection release message that is sent by the serving MSC/VLR and that includes an indication of a CSFB.
  • the connection release message including the LTE frequency band information further includes the PLMN ID.
  • a fifth aspect of the present invention provides a UE, including:
  • a receiving unit configured to receive, by the base station, a connection release message that includes long-term evolution LTE frequency band information
  • a regression unit configured to camp on the LTE frequency band information received by the receiving unit a cell in a frequency band, selecting a public land mobile network included in system broadcast information of the cell
  • the PLMN identifies the LTE PLMN corresponding to the ID.
  • the connection release message further includes a PLMN ID of the LTE network that is registered by the UE;
  • the regression unit includes:
  • a reading subunit configured to read the system broadcast information of the cell, where the system broadcast information includes at least two PLMN IDs;
  • a selecting subunit configured to select, from the at least two PLMN IDs read by the reading subunit, the LTE PLMN corresponding to the PLMN ID included in the connection release message.
  • a sixth aspect of the present invention provides a UE, including:
  • a receiving unit configured to receive, by the base station, a connection release message that includes long-term evolution LTE frequency band information
  • a camping unit configured to camp on a cell on the specified frequency band of the LTE frequency band information received by the receiving unit
  • a reading unit configured to read a public land mobile network PLMN identifier ID included in system broadcast information of a cell where the camping unit resides;
  • a selecting unit configured to select, from the PLMN IDs read by the reading unit, an LTE PLMN corresponding to the PLMN ID pre-stored by the UE, where the PLMN ID is saved by the UE to the UE when registering to the LTE PLMN in.
  • a seventh aspect of the present invention provides a base station, including:
  • a receiver configured to learn that the circuit domain fallback CSFB service of the user equipment UE ends; and is further configured to receive a public land mobile network PLMN identifier of the UE-registered Long Term Evolution (LTE) network that is sent by the serving mobile switching center/visiting location register MSC/VLR ID;
  • LTE Long Term Evolution
  • a processor configured to determine LTE frequency band information according to the PLMN ID received by the receiver;
  • a transmitter configured to send, to the UE, a connection release message that includes the LTE frequency band information determined by the processor.
  • the receiver is specifically configured to: receive a connection release message that is sent by the serving MSC/VLR and that includes a CSFB indication.
  • the connection release message including the LTE frequency band information further includes the PLMN ID.
  • a UE including:
  • a receiver configured to receive, by the base station, a connection release message that includes long-term evolution LTE frequency band information
  • a processor configured to camp on a cell in a frequency band specified by the LTE frequency band information received by the receiver, and select a public land mobile network PLMN included in system broadcast information of the cell
  • the LTE PLMN corresponding to the ID.
  • the system broadcast information of the cell in the specified frequency band of the LTE frequency band information includes only one PLMN ID;
  • the processor is further configured to camp on a cell on the specified frequency band of the LTE frequency band information received by the receiver; and return to the LTE in the cell according to system broadcast information of the camped cell
  • the connection release message further includes a PLMN ID of the LTE network registered by the UE;
  • the processor is further configured to read the system broadcast information of the camped cell, where the system broadcast information includes at least two PLMN IDs, and select the connection release from the at least two PLMN IDs.
  • a ninth aspect of the present invention provides a UE, including: a receiver, configured to receive a connection release message that is sent by the base station and includes the Long Term Evolution (LTE) frequency band information;
  • LTE Long Term Evolution
  • a processor configured to camp on a cell on the specified frequency band of the LTE frequency band information received by the receiver
  • a memory configured to save an LTE public land mobile network PLMN identity ID registered by the UE, where the PLMN ID is saved by the UE when registering to an LTE PLMN;
  • the receiver is further configured to receive system broadcast information of the cell that is camped on;
  • the processor is further configured to read a PLMN ID included in system broadcast information of the cell received by the receiver, and select an LTE PLMNo corresponding to the PLMN ID pre-stored in the memory.
  • a tenth aspect of the present invention provides a system for regressing a long-term evolution LTE network, including: a service MSC/VLR, a base station, and a UE;
  • the serving MSC/VLR configured to send, after the circuit domain fallback CSFB service of the UE ends, the LTE public land mobile network PLMN identity ID registered by the UE to the base station;
  • the base station is configured to learn that the circuit domain fallback CSFB service of the user equipment UE ends; and receive the public land mobile network PLMN identity ID of the LTE network registered by the UE that is sent by the serving mobile switching center/visiting location register MSC/VLR; Determining LTE frequency band information, and transmitting a connection release message including the LTE frequency band information to the UE;
  • the UE is configured to receive a connection release message that is sent by the base station and includes the LTE frequency band information; camp the cell that is in the frequency band specified by the LTE frequency band information, and select a public land mobile network PLMN included in the system broadcast information of the cell.
  • the LTE PLMN corresponding to the ID is identified.
  • An eleventh aspect of the present invention provides a method for regressing a Long Term Evolution (LTE) network, where the method includes: Receiving, in the circuit domain fallback CSFB, the user equipment UE receives an equivalent PLMN list of the public land mobile network PLMN identity ID of the LTE network that is registered by the UE by the mobility management network element;
  • a UE including:
  • a receiving unit configured to receive, in a circuit domain fallback CSFB, an equivalent PLMN list of a public land mobile network PLMN identity ID of the long term evolution LTE network that is sent by the mobility management network element and sent by the mobility management network element;
  • the receiving unit is further configured to receive information about the LTE frequency band that is sent by the base station;
  • a camping unit configured to camp on a cell in a frequency band specified by the LTE frequency band information received by the receiving unit
  • a selecting unit configured to select, from the at least one PLMN ID included in the system broadcast information of the cell where the camping unit resides, the LTE PLMNo corresponding to the PLMN ID included in the search equivalent PLMN list
  • a thirteenth aspect of the present invention provides a UE, including:
  • a receiver configured to receive, in a circuit domain fallback CSFB, an equivalent PLMN list that is sent by the mobility management network element and includes a public land mobile network PLMN identity ID of the UE-registered Long Term Evolution LTE network;
  • the receiver is further configured to receive information about the LTE frequency band that is sent by the base station;
  • a processor configured to camp on a frequency band specified by the LTE frequency band information received by the receiver a cell: selecting, from the at least one PLMN ID included in the system broadcast information of the cell, an LTE PLMN corresponding to the PLMN ID included in the equivalent PLMN list.
  • the method, the device and the system for regressing the LTE network determine the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the designated LTE frequency band after the CSFB service ends.
  • the LTE PLMN can specify the LTE frequency band supported by the LTE PLMN registered by the UE before the CSFB is initiated, thereby ensuring that the UE is redirected back.
  • the registered LTE PLMN not only reduces unnecessary PLMN inter-network handover, but also recovers data services suspended in the previously registered LTE PLMN, thereby improving the user experience.
  • FIG. 1 is a flowchart of a method for returning to an LTE network according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for returning to an LTE network according to another embodiment of the present invention
  • a flowchart of a method for returning to an LTE network is provided.
  • FIG. 4 is a flowchart of a method for returning to an LTE network according to another embodiment of the present invention.
  • FIG. 5 is a flowchart of a returning to an LTE network according to another embodiment of the present invention. Method flow chart;
  • FIG. 6 is a schematic structural diagram of a base station according to another embodiment of the present invention;
  • FIG. 7 is a schematic structural diagram of a UE according to another embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a UE according to another embodiment of the present invention
  • FIG. 9 is a schematic structural diagram of a base station according to another embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a UE composition according to another embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a UE according to another embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a system for returning to an LTE network according to another embodiment of the present invention
  • FIG. 13 is a flowchart of a method for returning to an LTE network according to another embodiment of the present invention
  • FIG. 15 is a schematic diagram of a UE composition according to another embodiment of the present invention.
  • the LTE network described in this specification is an evolved UMTS terrestrial radio access network (English full name is Evolved UMTS Territorial Radio Access Network, English tube called E-UTRAN, where UMTS Chinese is called universal mobile communication system, English The full name is Universal Mobile Telecommunications System), the 2G network is the GSM/EDGE radio access network (English full name is GSM/EDGE Radio Access Network, the English tube is called GERAN, where GSM Chinese is called global mobile communication system, English full name For Global System of Mobile communication, EDGE Chinese is called Enhanced Data Rate for GSM Evolution, and English is called Enhanced Data Rate for GSM Evolution.
  • the 3G network is the UTRAN network.
  • the PLMN of the LTE network only provides the PS domain service, while the 2G/3G network
  • the user equipment may be any one of the following, and the UE may be static or mobile.
  • the stationary UE may be included as a terminal, a mobile station, a Subscriber Unit, or a station.
  • Mobile UEs may include Cellular Phones, Personal Digital Assistants (PDAs), wireless modems, wireless communication devices, handhelds, laptop computers, cordless phones. ( Cordless Phone) or Wireless Local Loop (WLL) station.
  • PDAs Personal Digital Assistants
  • WLL Wireless Local Loop
  • the above UEs may be distributed throughout the wireless network.
  • the base station may be a Base Station Subsystem (BSS) in a 2G network, or a Radio Network Subsystem (RNS) in a 3G network.
  • the mobility management network element may be a Mobile Switching Centre (MSC)/Visitors Location Register (VLR), or a Mobility Management Entity (MME), or a Serving GPRS Support Node (Serving GPRS Support Node). Any one of the SGSNs, the MSC and the VLR are usually set to be the same network element, called MSC/VLR, or the cylinder is called a VLR.
  • the Circuit Service Fall Back (CSFB) process is used to roll back the UE from LTE to 2G/3G, so that the UE completes the circuit domain service in the 2G/3G network.
  • the terminal needs to return to the LTE network to continue the data service on the LTE network.
  • the CSFB service specifically refers to camping on an LTE network.
  • the UE initiates the CS service to the CS service after the CSFB process falls back to the 2G/3G network.
  • the CSFB service includes the uplink CSFB service and the downlink CSFB service.
  • the UE receives a voice call or initiates on the LTE network. A voice call, etc.
  • the UE can be internally divided into an Access Stratum (AS) and a Non-Access Stratum (NAS) according to different processing and control message objects.
  • AS Access Stratum
  • NAS Non-Access Stratum
  • the AS is responsible for receiving the RR/RRC connection release message, selecting a suitable cell according to the frequency band, and camping, reading the broadcast message of the small area system, obtaining the available PLMN ID, and reporting the PLMN ID to the NAS.
  • the NAS determines whether to perform PLMN selection according to the available PLMN ID reported by the AS layer.
  • An embodiment of the present invention provides a method for returning to an LTE network, which is applied to a circuit domain of a user equipment UE. After the CSFB service is terminated, as shown in FIG. 1, the method includes:
  • the base station learns that the circuit domain of the user equipment UE falls back and the CSFB service ends.
  • the base station receives a public land mobile network PLMN identity ID of the LTE network registered by the UE that is sent by the serving mobile switching center/visiting location register MSC/VLR.
  • the serving MSC/VLR obtains the PLMN ID of the LTE network registered by the UE from the registration information of the UE, if the serving MSC/VLR is the MSC/VLR registered by the UE. If the serving MSC/VLR is not the MSC/VLR registered by the UE, the PLMN ID of the LTE network registered by the UE is sent by the MSC/VLR registered by the UE to the serving MSC/VLR.
  • A03. Determine LTE frequency band information according to the PLMN ID.
  • the determined LTE frequency band information is LTE frequency band information supported by the PLMN corresponding to the PLMN ID.
  • the determined LTE frequency band information may also be LTE frequency band information supported by other PLMNs.
  • A04. Send a connection release message that includes the LTE frequency band information to the UE.
  • the base station sends a connection release message including the LTE frequency band information to the UE, to And the UE camps on the cell in the frequency band specified by the LTE frequency band information, and selects the LTE PLMN corresponding to the PLMN ID included in the system broadcast information of the cell.
  • connection release message may further include a PLMN ID of the LTE network registered by the UE, so that the UE camps on a cell in a frequency band specified by the LTE frequency band information, and is in the cell
  • the system broadcast information includes at least two PLMN IDs
  • the LTE PLMN corresponding to the PLMN ID included in the connection release message is selected.
  • the method for regressing an LTE network determines the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the LTE PLMN in the specified LTE frequency band after the CSFB service ends.
  • the LTE frequency band supported by the LTE PLMN registered by the UE before the CSFB service is initiated may be specified, thereby ensuring that the UE is redirected back to the previously registered LTE.
  • PLMN which not only reduces unnecessary PLMN inter-network handover, but also recovers data services suspended in previously registered LTE PLMNs, improving user experience.
  • Another embodiment of the present invention provides a method for returning to an LTE network, which is applied to a circuit domain of a user equipment UE. After the CSFB service is terminated, as shown in FIG. 2, the method includes:
  • the UE receives a connection release message that is sent by the base station and includes the LTE frequency band information.
  • the LTE frequency band information is determined by the base station according to the public land mobile network PLMN identifier ID of the LTE network registered by the UE.
  • the cell that resides in the frequency band specified by the LTE frequency band information selects the LTE PLMN corresponding to the PLMN ID included in the system broadcast information of the cell.
  • the connection release message may further include a PLMN ID of the LTE network registered by the UE; camping on a cell in a frequency band specified by the LTE frequency band information, and selecting the cell
  • the LTE PLMN corresponding to the PLMN ID included in the system broadcast information includes: Searching for a cell on the frequency band specified by the LTE frequency band information and camping on the cell; reading system broadcast information of the cell, where the system broadcast information includes at least two PLMN IDs; from the at least two PLMNs Selecting the LTE PLMNo corresponding to the PLMN ID of the LTE network registered by the UE in the ID
  • the method for regressing an LTE network determines the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the LTE PLMN in the specified LTE frequency band after the CSFB service ends.
  • the LTE frequency band supported by the LTE PLMN registered by the UE before the CSFB may be specified, thereby ensuring that the UE is redirected back to the previously registered LTE PLMN.
  • Another embodiment of the present invention provides a method for returning to an LTE network. As shown in FIG. 3, the method includes: 101.
  • a UE initiates joint registration and successfully registers with a PLMN1 supporting an LTE network and a PLMN2 supporting a CS network.
  • UEs that reside in E-UTRAN and support CSFB need to initiate a joint registration process to implement simultaneous registration to the EPC network PS domain and the CS network CS domain.
  • the source MSC/VLR in PLMN2 can acquire the PLMN ID1 of PLMN1.
  • the network side selects the source MSC/VLR for the UE:
  • the Mobile Management Entity MME selects an update request to establish an SGs association.
  • the source MSC/VLR sends a registration request to the Home Location Register (HLR) and acquires the CS domain subscription data of the UE, thereby implementing the UE in the CS. Domain registration.
  • the MME selects a serving MSC/VLR according to the current location information of the UE.
  • the MME According to the current location information of the UE and the International Mobile Subscriber Identity (IMSI) hash table, a service MSC/VLR is selected from the MSC pool.
  • IMSI International Mobile Subscriber Identity
  • the UE initiates CSFB in PLMN1 and successfully falls back to the CS network of PLMN2.
  • CSFB business can be initiated normally after successful joint registration.
  • the MME in the LTE network selects a CS serving PLMN ID for the UE and sends the selected CS serving PLMN ID to the base station (eNodeB) in the LTE network, in order to inform the eNodeB that the UE should be switched to CS domain ID network corresponding to the CS domain.
  • the CS domain service can be initiated.
  • the UE may send a CSFB indication to the serving MSC/VLR, and the CSFB indication is used to indicate that the current voice call is triggered by executing CSFB in the LTE network.
  • the UE makes a voice call.
  • the source MSC/VLR sends the PLMN ID1 to the serving MSC/VLR.
  • Step 103 is an optional step. If the serving MSC/VLR that the UE drops back to the 2G/3G network is the source MSC/VLR, step 103 is not performed. Step 103 is performed only when the serving MSC/VLR of the UE is not the source MSC/VLR registered in step 101.
  • the source MSC/VLR may acquire the PLMN ID1 registered by the UE from the registration information in the joint registration process of step 101. For example, in the joint registration process, the MME sends its MME name (name) to the source MSC/VLR, and the MME name contains the PLMN ID1 registered by the UE. Alternatively, in the joint registration process, the MME may send a Tracking Area Identity (TAI) or an E-UTRAN Cell Global Identifier to the source MSC/VLR (E-UTRAN Cell Global) Identity, ECGI), includes the PLMN ID1 registered by the UE in both TAI or ECGI.
  • TAI Tracking Area Identity
  • the UE if the UE falls back to the 2G/3G network and enters another MSC/VLR, that is, the service range of the target MSC/VLR, the UE will source MSC/ during the location update process with the target MSC/VLR.
  • the location information of the VLR is reported to the target MSC/VLR.
  • the target MSC/VLR sends a Mobile Application Part (MAP) protocol to send an identity request message (SEND IDENTIFICATION) to the source MSC/VLR according to the location information reported by the UE, requesting to acquire the PLMN ID registered by the UE, and the source MSC/VLR.
  • MAP protocol Mobile Application Part
  • the PLMN ID1 registered by the UE acquired in step 101 is transmitted to the target MSC/VLR.
  • the target MSC/VLR is the serving MSC/VLR in step 3.
  • the UE performs a CS domain service in the PLMN2.
  • the CS domain service performed after the CSFB may include initiating or receiving a voice call, supplementary service, and location service.
  • the serving MSC/VLR After the CS domain service of the UE ends, the serving MSC/VLR sends a CSFB indication and a PLMN ID1 to the base station, that is, the base station learns that the CSFB service of the UE ends.
  • the serving MSC/VLR initiates a connection connection release procedure to the base station, and carries the CSFB indication and the PLMN ID1 in the connection connection release message.
  • the CSFB indication is used to indicate that the CS domain service of the current UE is caused by the CSFB, and after the CS domain service ends, the UE needs to be redirected back to the LTE network; and, when redirected back to the LTE network, according to PLMN ID1 returns to the LTE PLMN corresponding to PLMN ID1.
  • the serving MSC/VLR may directly send the Tracking Area Identity (TAI) or the E-UTRAN Cell Global Identity (ECGI) of the PLMN ID1 that is registered by the UE to the base station.
  • TAI Tracking Area Identity
  • ECGI E-UTRAN Cell Global Identity
  • the base station determines the LTE frequency band 1 according to the PLMN ID1.
  • the base station may query the pre-configured LTE frequency band support information according to the PLMN ID2 and the received PLMN ID1 that are currently providing the CS domain service for the UE, and determine the LTE frequency band 1 information supported by the PLMN1.
  • the determined LTE frequency band 1 information is the LTE frequency band 1 information supported by the PLMN1 corresponding to the PLMN ID1.
  • the determined LTE frequency band 1 information may also be the LTE frequency band information supported by other PLMNs.
  • the base station sends a connection release message to the UE, where the connection release message includes the LTE frequency band 1 information.
  • connection release message mentioned in the specification of the present application may be a radio resource (RR) connection release message, or a radio resource control (RRC) connection release message, or other used to assist radio resource release.
  • RR radio resource
  • RRC radio resource control
  • the RNS sends an RRC connection release message to the UE, and the RRC connection release message includes a redirection indication, which is used to indicate that the UE releases the RRC connection and redirects back to the LTE network;
  • the content of the redirection indication is used to indicate that the UE redirects to the LTE network corresponding to the LTE frequency band 1.
  • the UE searches for a suitable cell and camps on the LTE frequency band 1.
  • the UE After releasing the current RR/RRC connection, the UE searches for a suitable cell in the LTE frequency band 1 according to the LTE frequency band 1 information specified in the redirection indication, and camps on the suitable cell searched on the LTE frequency band 1.
  • the suitable cell is a cell that the UE can camp on and can acquire normal traffic.
  • the UE that is searched on the LTE frequency band 1 may not obtain normal services (for example, only the emergency service can be obtained), that is, an unsuitable cell. In this case, the UE may be in all frequency bands. Re-searching for a suitable cell, but not within the scope of the embodiments of the present invention, will not be described again.
  • the UE reads the cell system broadcast information, and selects the LTE PLMN1 corresponding to the PLMN ID1 included in the system broadcast information.
  • the suitable cell searched by the UE on the LTE frequency band 1 is a non-shared cell, that is, the system broadcast information of the cell includes only one PLMN ID
  • the UE reads the system broadcast information of the cell
  • only the UE can read the system broadcast information of the cell.
  • the ID of the LTE PLMN1 is obtained, thereby selecting the PLMN1 to access the PS domain. Since the LTE frequency band 1 information is determined according to the PLMN ID1 registered by the UE, the UE camps on the cell in the specified frequency band of the LTE frequency band 1 information received in step 107, and selects the PLMN ID1 included in the system broadcast information of the cell, This is the LTE PLMN1 registered before returning to CSFB.
  • the traditional PLMN selection mechanism may be used to select one PLMN or randomly select one PLMN. .
  • the UE has returned to the LTE PLMN1 registered before the CSFB, and if the UE wants to perform the PS service, the connection establishment procedure can be initiated in the PLMN1.
  • the UE initiates a Tracking Area Updating (TAU) process to resume the suspended data service in the PLMN1.
  • TAU Tracking Area Updating
  • the UE can perform the joint TAU process instead of initiating the complete LTE registration process, thereby reducing the signaling overhead caused by the return to the LTE network.
  • the UE is performing PS data service in PLMN1 before CSFB, it is suspended because CSFB is interrupted.
  • the suspended data service is deleted and terminated, and the user needs to re-initiate the data service.
  • the mechanism for returning to the LTE network provided by the present invention returns to the CSFB before returning to the CSFB.
  • Registered LTE PLMN1 can recover the suspended data service and improve the user experience.
  • the base station may initiate a PS handover procedure to switch the UE back to the previously registered LTE PLMN, where the base station performs PS handover.
  • the PLMN ID is considered when selecting a target cell.
  • the UE performs a handover procedure initiated by the base station, thereby returning to the previously registered LTE PLMN. It should be noted that, if the base station initiates the PS handover procedure after step 105, step 106 to step 109 will not be performed, and step 110 is directly executed after the PS handover procedure is completed.
  • the method for regressing an LTE network determines the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the LTE PLMN in the specified LTE frequency band after the CSFB service ends.
  • the LTE frequency band supported by the LTE PLMN registered by the UE before the CSFB can be specified, thereby ensuring that the UE is redirected back to the previously registered LTE PLMN.
  • another embodiment of the present invention further provides a method for returning to the LTE network, as shown in FIG. 4 . As shown, including:
  • the UE initiates joint registration and successfully registers to the PLMN1 supporting the LTE network and the PLMN2 supporting the CS network.
  • the UE initiates CSFB in PLMN1 and successfully falls back to the CS network of PLMN2.
  • the source MSC/VLR sends the PLMN ID1 to the serving MSC/VLR.
  • Step 203 is an optional step, and step 203 is performed only when the serving MSC/VLR of the UE is not the source MSC/VLR registered in step 201. 204.
  • the UE performs a CS domain service in the PLMN2.
  • the serving MSC/VLR sends a CSFB indication and a PLMN ID1 to the base station.
  • the serving MSC/VLR initiates a connection connection release procedure to the base station, and carries the CSFB indication and the PLMN ID1 in the connection connection release message.
  • the CSFB indication is used to indicate that the CS domain service of the current UE is caused by the CSFB, and after the CS domain service ends, the UE needs to be redirected back to the LTE network; and, when redirected back to the LTE network, according to PLMN ID1 returns to the LTE PLMN corresponding to PLMN ID1.
  • the serving MSC/VLR may directly send the Tracking Area Identity (TAI) or the E-UTRAN Cell Global Identity (ECGI) of the PLMN ID1 that is registered by the UE to the base station.
  • TAI Tracking Area Identity
  • ECGI E-UTRAN Cell Global Identity
  • the base station determines LTE frequency band 1 information according to the PLMN ID1.
  • the information about the LTE frequency band 1 is the LTE frequency band information supported by the PLMN1 corresponding to the PLMN ID1.
  • the determined LTE frequency band 1 information may also be the LTE frequency band information supported by other PLMNs.
  • the steps 201-206 are similar to the implementations of the steps 101-106 in the embodiment shown in FIG. 3, and details are not described herein again.
  • the base station sends a connection release message to the UE, where the connection release message includes the LTE frequency band 1 and the PLMN ID1.
  • the LTE frequency band 1 and the PLMN ID1 may be carried in an RR/RRC connection release message, where the LTE frequency band 1 is used as a redirection indication, and is used to indicate that the UE needs to return to the LTE network after releasing the RR/RRC connection, and according to The LTE band 1 included in the PLMN ID1 and the redirection indication is returned to the LTE PLMN1 corresponding to the PLMN ID1. 208.
  • the UE searches for a suitable cell and camps on the LTE frequency band 1.
  • the UE searches for a suitable cell and camps on the LTE frequency band 1 according to the LTE frequency band 1 information specified in the redirection indication.
  • the cell in which the UE resides may be a shared cell or a non-shared cell.
  • the UE can read the currently available PLMN from the system broadcast information of the cell, and the available PLMN mentioned in the specification refers to the PLMN ID read by the UE in the system broadcast message of the camped cell. PLMN. If the UE reads only one PLMN ID from the system broadcast information of the cell, and the PLMN ID is PLMN ID1, that is, the camped cell is a non-shared cell and the PLMN1 is available, the UE can directly return to the PLMN1.
  • the UE reads at least two PLMN IDs from the system broadcast information of the cell, that is, the camped cell is a shared cell, that is, at least two PLMN IDs are read from the system broadcast information, and the at least two PLMNs
  • the ID includes the PLMN ID 1 , that is, the LTE PLMN1 is available, and then the PLMN1 corresponding to the PLMN ID1 is selected, whereby the UE returns to the LTE PLMN1 registered before the CSFB is initiated.
  • the UE may abandon the return to the previously registered LTE PLMN1, and select other Available LTE PLMN.
  • the AS layer acquires the PLMN ID carried in the system broadcast message, and the PLMN ID1 sent by the base station, and matches the PLMN ID1 with the PLMN ID in the system broadcast information, and determines that the PLMN1 is available, and only reports the PLMN ID1 to the NAS layer, so that the NAS Only one available PLMN ID1 is obtained, thereby directly selecting PLMN1 corresponding to PLMN ID1, that is, returning to the LTE network registered before CSFB.
  • the system broadcast information does not include the PLMN ID1, that is, the PLMN1 is unavailable, it indicates that the UE may have left the coverage of the PLMN1 and cannot return to the PLMN1, so the AS The layer may report other PLMN IDs obtained in the system broadcast message, so that the NAS layer performs a normal PLMN selection process and returns to the LTE network.
  • the base station may initiate a PS handover procedure to switch the UE back to the previously registered LTE PLMN, where the base station performs PS handover.
  • the PLMN ID is considered when selecting a target cell.
  • the UE performs a handover procedure initiated by the base station to return to the previously registered LTE PLMN. It should be noted that, if the base station initiates the PS handover procedure after step 205, step 206 to step 209 will not be performed, and step 210 is directly executed after the PS handover procedure is completed.
  • the method for regressing an LTE network determines the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the designated LTE frequency band and specifies the PLMN ID after the CSFB service ends.
  • the LTE PLMN can specify the LTE frequency band and the PLMN ID previously registered by the UE, thereby ensuring that the UE is redirected back to the previously registered LTE PLMN, which reduces Unnecessary PLMN inter-network handover, and can continue the data service suspended in the previously registered LTE PLMN to improve the user experience.
  • the UE can be redirected back to the LTE PLMN registered before the CSFB, further ensuring the accuracy of the LTE PLMN registered before the UE returns to the CSFB.
  • Another embodiment of the present invention further provides a method for regressing an LTE network, which can implement LTE PLMN registered before returning to CSFB only by implementing finer-grained LTE PLMN selection on the UE side. As shown in FIG. 5, the method includes:
  • the UE initiates a joint registration process and successfully registers the PLMN1 supporting the LTE network with the PLMN2 supporting the CS network. In the process of the joint registration, the UE stores the PLMN ID1 corresponding to the PLMN1.
  • the MME allocates a valid Globally Unique Temporary Identity (GUTI) and a TAI to the UE in the process of registering to the PLMN1, and the PLMN1 identifier (PLMN ID1) is included in the GUTI and the TAI. ).
  • GUI Globally Unique Temporary Identity
  • PLMN ID1 PLMN1 identifier
  • the UE initiates CSFB in PLMN1 and successfully falls back to the CS network of PLMN2.
  • the UE performs a CS domain service in the PLMN2.
  • the step 302 is similar to the implementation of the step 102 in the embodiment shown in FIG. 3, and the step 303 is similar to the implementation of the step 104 in the embodiment shown in FIG. 3, and details are not described herein again.
  • the serving MSC/VLR sends a CSFB indication to the base station.
  • the CSFB indication is used to indicate that the CS domain service of the current UE is caused by the CSFB.
  • the UE needs to be redirected back to the LTE network.
  • the base station determines the LTE frequency band 2 corresponding to the PLMN2.
  • the base station After receiving the CSFB indication, the base station needs to redirect the UE back to the LTE network. Therefore, according to the PLMN2 of the CS domain network where the UE is currently located, the LTE frequency band 2 supported by the PLMN2 is determined, so that the UE can be in the LTE frequency band 2. Search for LTE networks.
  • the determined LTE frequency band information is LTE frequency band information supported by the PLMN corresponding to the PLMN ID.
  • the determined LTE frequency band information may also be LTE frequency band information supported by other PLMNs.
  • the base station sends a connection release message to the UE, where the connection release message includes an LTE frequency band. 2 information.
  • the content of the redirection indication is LTE frequency band 2 information, which is used to indicate that the UE searches for a suitable cell on the LTE frequency band 2, thereby returning to the LTE network in the suitable cell.
  • the UE searches for a suitable cell and camps on the LTE frequency band 2.
  • the cell in which the UE resides may be a shared cell or a non-shared cell.
  • the UE reads the cell system broadcast information, and selects the PLMN1 corresponding to the pre-stored PLMN ID1. If the UE reads only one PLMN ID from the system broadcast information of the cell, that is, the camped cell is a non-shared cell, the UE can directly return to the PLMN1. If the UE reads at least two PLMN IDs from the system broadcast information of the cell, that is, the camped cell is a shared cell, the PLMN1 corresponding to the pre-stored PLMN ID1 is selected. In order to allow the UE to select the LTE network to be registered before the CSFB, the UE may select the previously registered LTE PLMNl according to the PLMN ID1 pre-stored in the UE in the registration process of step 301.
  • the UE is internally configured as an Access Stratum (AS) and a Non-Access Stratum (NAS) according to different processed and controlled message objects.
  • the AS layer reads at least two PLMN IDs carried in the system broadcast message and reports them to the NAS layer.
  • the NAS layer obtains the PLMN ID1 included in the legal GUTI that is pre-stored, and matches the PLMN ID1 in the GUTI with at least two PLMN IDs reported by the AS layer. If the PLMN ID1 is in the PLMN ID reported by the AS layer, the PLMN ID1 is directly selected, thereby directly returning to the PLMN1 corresponding to the PLMN ID1, that is, returning to the LTE network registered before the CSFB.
  • the PLMN ID reported by the AS layer does not include the PLMN ID1, that is, the PLMN1 is unavailable, it indicates that the UE may have left the coverage of the PLMN1 and cannot return to the PLMN1, so the NAS may perform a normal PLMN selection procedure and return to the LTE network. .
  • the UE may also obtain the PLMN ID1 in the legal TAI, and select the PLMN ID1 pair. Should be PLMN1, that is, LTE PLMN1 registered before CSFB.
  • the UE returns to PLMN1, initiates a joint TAU process, and recovers the data service suspended in PLMN1.
  • the base station may initiate a PS handover procedure to switch the UE back to the previously registered LTE PLMN, where the base station performs PS handover.
  • the PLMN ID is considered when selecting a target cell.
  • the UE performs a handover procedure initiated by the base station to return to the previously registered LTE PLMN. It should be noted that if the base station initiates the PS handover procedure after step 304, step 305 to step 308 will not be performed, and step 309 is directly executed after the PS handover procedure is completed.
  • the method for regressing the LTE network when the UE reverts back to the LTE domain network, selects the pre-stored registered PLMN ID, returns to the LTE PLMN of the PLMN ID, and returns to the PLMN ID registered before the CSFB.
  • the LTE PLMN not only reduces unnecessary PLMN inter-network handover, but also recovers data services suspended in previously registered LTE PLMNs, thereby improving the user experience. Moreover, only the reselection mode on the UE side is improved, the modification of the protocol is small, and the implementation cost is low.
  • Another embodiment of the present invention further provides a base station, as shown in FIG. 6, comprising: a receiving unit 41, a determining unit 42, a sending unit 43, and a learning unit 44.
  • the learning unit 44 is configured to learn that the circuit domain fallback CSFB service of the user equipment UE ends.
  • the receiving unit 41 is configured to: after the learning unit 44 learns that the CSFB service of the UE ends, Receiving a public land mobile network PLMN identity ID of the UE-registered Long Term Evolution (LTE) network that is sent by the serving mobile switching center/visiting location register MSC/VLR of the user equipment UE;
  • LTE Long Term Evolution
  • a determining unit 42 configured to determine LTE frequency segment information corresponding to the PLMN ID received by the receiving unit 41;
  • a sending unit 43 configured to send, to the UE, a connection release message that includes the LTE frequency band information determined by the determining unit 42, so that the UE camps on a cell in a frequency band specified by the LTE frequency band information, and Selecting the LTE PLMNo corresponding to the PLMN ID included in the system broadcast information of the cell
  • the learning unit 44 is specifically configured to: receive a connection release message that is sent by the serving MSC/VLR and that includes the CSFB indication.
  • the serving MSC/VLR acquires the PLMN ID from the registration information of the UE;
  • the PLMN ID is sent by the MSC/VLR registered by the UE to the serving MSC/VLR.
  • the connection release message further includes the PLMN ID, so that the UE camps on a cell in a frequency band specified by the LTE frequency band information, and selects when the system broadcast information of the cell includes at least two PLMN IDs.
  • the LTE PLMN corresponding to the PLMN ID is the PLMN ID.
  • the base station provided by the embodiment of the present invention determines the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the LTE PLMN in the specified LTE frequency band after the CSFB service ends, and the prior art Return to CS PLMN support
  • the LTE frequency band supported by the LTE PLMN registered by the UE before the CSFB can be specified, thereby ensuring that the UE is redirected back to the previously registered LTE PLMN, thereby reducing unnecessary PLMN inter-network handover, and The data service suspended in the previously registered LTE PLMN can be restored to improve the user experience.
  • Another embodiment of the present invention further provides a UE, as shown in FIG. 7, comprising: a receiving unit 51 and a returning unit 52.
  • the receiving unit 51 is configured to receive, by the base station, a connection release message that includes long-term evolution LTE frequency band information, where the LTE frequency band information is determined by the base station according to the LTE public land mobile network PLMN identifier ID that is registered by the UE;
  • the regression unit 52 is configured to camp on the cell in the frequency band specified by the LTE frequency band information received by the receiving unit 51, and select an LTE PLMN corresponding to the PLMN ID included in the system broadcast information of the cell.
  • the system broadcast information of the cell in the specified frequency band of the LTE frequency band information includes only one PLMN ID.
  • the regression unit 52 may be specifically configured to: receive at the receiving unit 51. Searching for a cell on a specified frequency band of the LTE frequency band information, and camping on a cell on the specified frequency band of the LTE frequency band information; reading system broadcast information of the cell, and obtaining an available PLMN ID from the system broadcast information; Return to the LTE PLMNo registered before the UE initiated CSFB
  • the LTE frequency band information specifies a system broadcast of a cell on a frequency band.
  • the information includes at least two PLMN IDs; in order to ensure that at least two PLMNs in the cell in the frequency band specified by the LTE frequency band information are available, the LTE PLMN registered before the UE may be accurately returned, and the connection release message may also be
  • the PLMN ID is included; the regression unit 52 can include: a read subunit 521 and a select subunit 522.
  • a reading subunit 521 configured to read the system broadcast information of the cell, where the system broadcast information includes at least two PLMN IDs;
  • the selecting subunit 522 is configured to select, from the at least two PLMN IDs read by the reading subunit 521, the LTE PLMN corresponding to the PLMN ID included in the connection release message.
  • the UE provided by the embodiment of the present invention obtains the LTE frequency band information supported by the LTE PLMN registered by the UE, and returns to the LTE PLMN in the specified LTE frequency band after the CSFB service ends, and returns to the LTE supported by the CS PLMN in the prior art.
  • the LTE frequency band supported by the LTE PLMN registered before the UE CSFB can be specified, thereby ensuring that the UE is redirected back to the previously registered LTE PLMN, which reduces unnecessary PLMN inter-network handover and can be restored.
  • the data service that is suspended in the previously registered LTE PLMN improves the user experience.
  • Another embodiment of the present invention further provides a UE, as shown in FIG. 8, comprising: a receiving unit 61, a camping unit 62, a reading unit 63, and a selecting unit 64.
  • the receiving unit 61 is configured to receive a connection release message that is sent by the base station and includes the Long Term Evolution (LTE) frequency band information.
  • a camping unit 62 configured to camp on a cell on the specified frequency band of the LTE frequency band information received by the receiving unit 61;
  • the reading unit 63 is configured to read a public land mobile network PLMN identifier ID included in system broadcast information of a cell where the camping unit 62 resides;
  • the selecting unit 64 is configured to select, from the PLMN IDs read by the reading unit 63, an LTE PLMN corresponding to the PLMN ID pre-stored by the UE, where the PLMN ID is saved by the UE when registering to the LTE PLMN. Said in the UE.
  • the UE provided by the embodiment of the present invention selects a pre-stored registered PLMN ID and returns to the LTE PLMN of the PLMN ID when redirecting to the LTE domain network, and is randomly added to the LTE frequency band supported by the CS PLMN in the prior art.
  • the UE can return to the LTE PLMN corresponding to the PLMN ID registered before the CSFB, which can reduce unnecessary PLMN inter-network handover, and can resume the suspended data service in the previously registered LTE PLMN, thereby improving the user experience.
  • a base station as shown in FIG. 9, including: a receiver 71, a processor 72, and a transmitter 73.
  • the receiver 71 is configured to learn that the circuit domain fallback CSFB service of the user equipment UE ends; and is further configured to receive the public land mobile network PLMN of the UE-registered Long Term Evolution (LTE) network that is sent by the serving mobile switching center/visiting location register MSC/VLR. Identification ID;
  • the processor 72 is configured to determine, according to the PLMN ID received by the receiver, the LTE frequency band information, where the transmitter 73 is configured to send, to the UE, a connection release message that includes the LTE frequency band information determined by the processor 72, So that the UE camps on a cell on a frequency band specified by the LTE frequency band information, and selects an LTE corresponding to a PLMN ID included in system broadcast information of the cell.
  • PLMNo PLMNo
  • the receiver 71 is specifically configured to: receive a connection release message that is sent by the serving MSC/VLR and that is instructed by the CSFB.
  • the serving MSC/VLR acquires the PLMN ID from the registration information of the UE;
  • the PLMN ID is sent by the MSC/VLR registered by the UE to the serving MSC/VLR.
  • the connection release message further includes the PLMN ID, so that the UE camps on a cell in a frequency band specified by the LTE frequency band information, and selects when the system broadcast information of the cell includes at least two PLMN IDs.
  • the LTE PLMN corresponding to the PLMN ID is the PLMN ID.
  • the base station determines the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the LTE PLMN in the specified LTE frequency band after the CSFB service ends, and the prior art
  • the LTE frequency band supported by the LTE PLMN registered before the UE CSFB can be specified, thereby ensuring that the UE is redirected back to the previously registered LTE PLMN, thereby reducing unnecessary
  • the PLMN network switching can restore the suspended data service in the previously registered LTE PLMN to improve the user experience.
  • Another embodiment of the present invention further provides a UE, as shown in FIG. 10, including: a receiver 81 and a processor 82.
  • the receiver 81 is configured to receive, by the base station, a connection release message that includes long-term evolution LTE frequency band information.
  • the processor 82 is configured to camp on the cell in the frequency band specified by the LTE frequency band information received by the receiver 81, and select an LTE PLMNo corresponding to the PLMN ID included in the system broadcast information of the cell.
  • the system broadcast information of the cell in the specified frequency band of the LTE frequency band information includes only one PLMN ID;
  • the processor 82 is further configured to camp on a cell in the specified frequency band of the LTE frequency band information received by the receiver 81; and return to the LTE in the cell according to the system broadcast information of the camped cell PLMNo
  • the system broadcast information of the cell in the specified frequency band of the LTE frequency band information includes at least two PLMN IDs; to ensure that at least two PLMNs in the cell in the frequency band specified by the LTE frequency band information are available.
  • the LTE PLMN registered before the UE may be accurately returned, and the connection release message further includes a PLMN ID.
  • the processor 82 is further configured to camp on a cell on the specified frequency band of the LTE frequency band information received by the receiver 81; and read system broadcast information of the resident cell, where the system broadcast information includes At least two PLMN IDs; selecting an LTE PLMN corresponding to the PLMN ID from the at least two PLMN IDs.
  • the UE provided by the embodiment of the present invention obtains the LTE frequency band information supported by the LTE PLMN registered by the UE, and returns to the LTE PLMN in the specified LTE frequency band after the CSFB service ends, and Compared with the LTE PLMN in the LTE frequency band supported by the CS PLMN in the prior art, the LTE frequency band supported by the LTE PLMN registered by the UE CSFB may be specified, thereby ensuring that the UE is redirected back to the previously registered LTE PLMN, which reduces Unnecessary PLMN inter-network handover can restore the suspended data service in the previously registered LTE PLMN, improving the user experience.
  • Another embodiment of the present invention further provides a UE, as shown in FIG. 11, comprising: a receiver 91, a processor 92, and a memory 93.
  • the receiver 91 is configured to receive a connection release message that is sent by the base station and includes the long-term evolution LTE frequency band information.
  • the processor 92 is configured to camp on the cell on the specified frequency band of the LTE frequency band information received by the receiver 91;
  • a memory 93 configured to store an LTE PLMN corresponding to a public land mobile network PLMN identity ID of the LTE network registered by the UE, where the PLMN ID is saved by the UE when registering to the LTE PLMN;
  • the receiver 91 is further configured to receive system broadcast information of the cell that is camped on.
  • the processor 92 is further configured to read, in the system broadcast information of the cell that is received by the receiver 91, PLMN ID, selecting the PLMN ID corresponding to the pre-stored in the memory 93
  • the UE provided by the embodiment of the present invention selects pre-existing when redirecting to the PS domain network.
  • the stored PLMN ID is returned to the LTE PLMN of the PLMN ID, and the UE can return to the LTE PLMN corresponding to the PLMN ID registered before the CSFB, compared with the prior art in which the PLMN is randomly reselected on the LTE frequency band supported by the CS PLMN. , which not only reduces unnecessary PLMN network switching, but also recovers data services suspended in the previously registered LTE PLMN, thereby improving the user experience. Moreover, only the reselection mode on the UE side is improved, the modification of the protocol is small, and the implementation cost is low.
  • Another embodiment of the present invention further provides a system for returning to an LTE network, as shown in FIG. 12, including: a serving MSC/VLR 1001, a base station 1002, and a UE 1003;
  • the serving MSC/VLR 1001 is configured to send, after the circuit domain fallback CSFB service of the UE 1003, the LTE public land mobile network PLMN identity ID registered by the UE 1003 to the base station 1002;
  • the base station 1002 is configured to learn that the circuit domain fallback CSFB service of the user equipment UE1003 ends; receive the public land mobile network PLMN identity ID of the LTE network registered by the UE1103 sent by the serving mobile switching center/visit location register MSC/VLR1101; Determining LTE frequency band information according to the PLMN ID, and transmitting a connection release message including the LTE frequency band information to the UE 1103;
  • the UE 1003 is configured to receive a connection release message that is sent by the base station 1002 and includes the LTE frequency band information; camp the cell that is in the frequency band specified by the LTE frequency band information, and select a public land mobile network that is included in the system broadcast information of the cell.
  • the PLMN identifies the LTE PLMN corresponding to the ID.
  • the system for regressing an LTE network determines the LTE frequency band information supported by the LTE PLMN registered by the UE by acquiring the PLMN ID registered by the UE, so that the UE returns to the designated LTE frequency band and specifies the PLMN ID after the CSFB service ends.
  • LTE PLMN which can specify UEs compared to LTE PLMNs in the LTE band supported by CS PLMN in the prior art.
  • the previously registered LTE PLMN not only reduces unnecessary PLMN inter-network handover, but also recovers data services suspended in the previously registered LTE PLMN, thereby improving the user experience.
  • Another embodiment of the present invention further provides a method for returning to an LTE network. As shown in FIG. 13, the method may include:
  • the UE initiates a joint registration process and successfully registers with the PLMN1 supporting the LTE network and the PLMN2 supporting the CS network.
  • the UE initiates CSFB in PLMN1 and successfully falls back to the CS network of PLMN2.
  • the steps 1101-1102 are similar to the implementations of the steps 101-102 in the embodiment shown in FIG. 3, and details are not described herein again.
  • the mobility management network element sends an equivalent PLMN list to the UE, where the equivalent PLMN list includes the PLMN ID1 registered by the UE.
  • the mobile management network element may be a serving MSC/VLR or a serving GPRS support node in a 2G/3G network (English called Serving GPRS Support Node, English tube called SGSN, where GPRS Chinese is called General Packet Radio Service) Technology, English is called General Packet Radio Service).
  • the UE initiates a CS domain location area update (LAU) process to the serving MSC/VLR, in the update request.
  • the message carries the CSFB indication, and the serving MSC/VLR sends an equivalent PLMN list to the UE in the location update procedure (LAU) according to the carried CSFB indication, where the equivalent PLMN list includes the PLMN registered by the UE before the CSFB. ID1, optionally the equivalent PLMN list may only include the PLMN ID1 that the UE registered before the CSFB.
  • the UE initiates a PS domain routing domain update process to the SGSN, if the routing domain update process is initiated after the PS handover process is completed.
  • the SGSN may learn that the routing domain update process is initiated in the CSFB process during the PS handover process, or the SGSN learns from the MME registered by the UE that the routing domain update process is in the routing domain update process.
  • the SGSN sends an equivalent PLMN list to the UE according to the CSFB indication, where the equivalent PLMN list includes the PLMN ID1 registered by the UE before the CSFB, and optionally the equivalent PLMN list may only Includes the PLMN ID1 that the UE registered before CSFB.
  • the serving MSC/VLR and the SGSN may send the same equivalent PLMN list to the UE, and send the same to the serving MSC/VLR and the SGSN.
  • the PLMN list includes the PLMN ID1 registered by the UE before the CSFB.
  • the equivalent PLMN list may include only the PLMN ID1 registered by the UE before the CSFB.
  • the UE performs a CS domain service in the PLMN2.
  • the serving MSC/VLR sends a CSFB indication to the base station.
  • Step 1105 is similar to the implementation of step 304 in the embodiment shown in FIG. 5, where the CSFB indication is used to indicate that the CS domain service of the current UE is caused by CSFB, and after the CS domain service ends, The UE is redirected back to the LTE network.
  • the base station determines the LTE frequency band 2 corresponding to the PLMN2.
  • the determined LTE frequency band information is LTE frequency band information supported by the PLMN corresponding to the PLMN ID.
  • the determined LTE frequency band information may also be LTE frequency band information supported by other PLMNs.
  • the base station sends a connection release message to the UE, where the connection release message includes an LTE frequency. Segment 2 information.
  • the UE searches for a suitable cell and camps on the LTE frequency band 2.
  • steps 1106-1108 is similar to the steps 305-307 in the embodiment shown in FIG. 5, and details are not described herein again.
  • the UE reads the system broadcast information of the cell, and selects the LTE PLMN1 corresponding to the PLMN ID1 included in the equivalent PLMN list from the PLMN IDs included in the system broadcast information.
  • the UE may read at least two available PLMN IDs from the system broadcast information of the cell, and the PLMN ID1 included in the equivalent PLMN list received and saved in step 1103 and the PLMN read in the system broadcast information. The ID is matched. If there is a PLMN ID that matches PLMN ID1, then LTE PLMN1 is available, and LTE PLMN1 is directly selected. If there is no PLMN ID matching the PLMN ID1 in the PLMN ID read in the system broadcast information, it indicates that LTE PLMN1 is unavailable, and the UE may select a PLMN or randomly select an available PLMN by using a conventional PLMN reselection mechanism.
  • the base station may initiate a PS handover procedure to switch the UE back to the previously registered LTE PLMN, where the base station performs PS handover.
  • the PLMN ID is considered when selecting a target cell.
  • the UE performs a handover procedure initiated by the base station to return to the previously registered LTE PLMN. It should be noted that, if the base station initiates the PS handover procedure after step 1105, step 1106 to step 1108 will not be performed, and step 1109 is directly executed after the PS handover procedure is completed.
  • the method for regressing an LTE network is configured by configuring the equivalent PLMN list acquired by the UE to include only the list of PLMN IDs registered by the UE before the CSFB, so that the UE returns to the LTE network according to the equivalent PLMN list. And only one alternative equivalent PLMN, and a method for selecting one PLMN from at least two equivalent PLMNs in a cell in the prior art In contrast, it can be ensured that the UE is redirected back to the previously registered LTE PLMN, which not only reduces unnecessary PLMN inter-network handover, but also recovers the suspended data service in the previously registered LTE PLMN, thereby improving the user experience.
  • Another embodiment of the present invention further provides a UE. As shown in FIG. 14, the method includes: a receiving unit 1201, a resident unit 1202, and a selecting unit 1203.
  • the receiving unit 1201 receives an equivalent PLMN list of the public land mobile network PLMN identity ID of the long-term evolution LTE network that is registered by the UE and is sent by the mobility management network element during the circuit domain fallback CSFB; a connection release message of the LTE frequency band information; a camping unit 1202, configured to camp on a cell on a frequency band specified by the LTE frequency band information received by the receiving unit 1201;
  • the selecting unit 1203 is configured to select, from the at least one PLMN ID included in the system broadcast information of the cell where the camping unit 1202 resides, the LTE PLMN corresponding to the PLMN ID included in the equivalent PLMN list.
  • the UE provided by the embodiment of the present invention configures the equivalent PLMN list acquired by the UE to include only the list of PLMN IDs registered by the UE before the CSFB, so that the UE has one and only one when returning to the LTE network according to the equivalent PLMN list.
  • the alternative equivalent PLMN can ensure that the UE redirects back to the previously registered LTE PLMN, which is less unnecessary than the method in the prior art, in which the UE selects one PLMN from at least two equivalent PLMNs in the cell.
  • the PLMN inter-network handover can restore the suspended data service in the previously registered LTE PLMN to improve the user experience.
  • Another embodiment of the present invention further provides a UE. As shown in FIG.
  • the method includes: a receiver 1301 and a processor 1302.
  • the receiver 1301 is configured to receive, in a circuit domain fallback CSFB, an equivalent PLMN list that is sent by the mobility management network element and includes a public land mobile network PLMN identity ID of the long-term evolution LTE network that is registered by the UE; Long-term evolution of LTE band information;
  • the processor 1302 is configured to camp on a cell on a frequency band specified by the LTE frequency band information received by the receiver 1301, and select an equivalent PLMN list from a public land mobile network PLMN identity ID included in the system broadcast information of the cell.
  • the receiver 1301 is further configured to receive, in the CSFB process of the UE, the equivalent PLMN list sent by the mobility management network element, where the equivalent PLMN list includes only the PLMN ID registered by the UE.
  • the UE provided by the embodiment of the present invention configures the UE to obtain only the list of the PLMN IDs registered by the UE before the CSFB, so that the UE returns to the list according to the equivalent PLMN list.
  • the LTE network has one and only one optional equivalent PLMN. Compared with the method in the prior art, the UE selects one PLMN from at least two equivalent PLMNs in the cell, and can ensure that the UE is redirected back to the previously registered.
  • the LTE PLMN not only reduces unnecessary PLMN inter-network handover, but also recovers data services suspended in the previously registered LTE PLMN, thereby improving the user experience.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative
  • the division of the module or unit is only a logical function division, and the actual implementation may have another division manner, for example, multiple units or components may be combined or may be integrated into another system, or some Features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software function unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .
  • the application can be implemented by means of software plus the necessary general hardware, and of course hardware, but in many cases the former is a better implementation.
  • the technical solution of the present application which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. , a hard disk or an optical disk, etc., including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present application.

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Abstract

本发明公开了一种回归LTE网络的方法、设备及系统,涉及通信技术领域,使UE在CSFB业务结束后可以回到CSFB之前注册的LTE PLMN,保证PS业务的连续性,避免不必要的PLMN网间切换,提升用户体验。本发明的方法包括:UE的CSFB业务结束后,基站接收UE的服务MSC/VLR发送的UE注册的LTE网络的PLMNID;根据PLMNID确定LTE频段信息;将包含LTE频段信息的连接释放消息发送给UE,以便UE回归到之前注册的PLMNID对应的LTEPLMN。本发明的实施例主要用于CSFB业务结束后回归到LTE网络的过程中。

Description

一种回归长期演进 LTE网络的方法、 设备及系统
技术领域
本发明涉及通信技术领域, 尤其涉及一种在电路域回落(Circuit Switched Fallback, CSFB )业务结束后回归长期演进( Long Term Evolution, LTE ) 网 络的方法、 设备及系统。 背景技术
电路域( Circuit Service, CS ) 网络是提供语音呼叫等电路域服务的无线 网络, 例如 GSM、 WCDMA等 2G/3G无线网络的覆盖非常普遍。 与此同时, 随着网络技术的发展, 专门提供数据服务的分组域(Packet Service, PS ) 网 络, 例如长期演进 ( Long Term Evolution, LTE ) 网络也正在大规模部署中。 因此,在目前的通信网络中 CS域网络和 PS域网络并存,运营商可以用 2G/3G 网络来为用户提供电路域服务, 用 LTE网络为用户提供数据服务。
基于这种网络覆盖方式, 第三代合作伙伴项目 ( 3rd Generation Partnership Project, 3GPP )组织提出了"电路域回落"( CS Fallback, CSFB )技术, 使得 注册到 LTE网络的用户设备 ( User Equipment, UE )在需要处理 CS语音业务 时回到 2G/3G网络 CS域完成业务处理。 在 CS语音呼叫完成后, 现有协议还 定义了 CSFB回归机制, 以确保 UE能够在完成 CS语音呼叫后回到 PS域网 络进行 PS业务, 具体包括: MSC/VLR释放 CS语音呼叫建立的连接, 并指 示给基站当前连接是因 CSFB所建立的, 然后基站在释放连接时, 指示 UE重 选回 LTE网络的 LTE频段信息, 使得 UE重定向到该 LTE频段信息上的合适 小区后, 随机重选进入该合适小区广播信息中的一个 LTE公共陆地移动网络 ( Public Land Mobile Network, PLMN )。
在实现上述回归 LTE网络的过程中, 发明人发现现有技术中至少存在如 下问题: 由于 CS域语音业务完成后, UE可能处于多个不同 PLMN的 LTE网 络覆盖中, 例如 CSFB之前 UE注册的 LTE PLMN, 以及当前 CS服务 PLMN 的 LTE网络对于 UE均可用。 若 UE重选到其他 PLMN的 LTE 网络, 则在 CSFB业务触发之前所注册的 LTE PLMN中挂起的数据业务就无法恢复, 造 成正在进行的数据业务被终止, 同时造成不必要的 PLMN网间切换, 影响用 户的业务体验。
发明内容
本发明的实施例提供一种回归 LTE 网络的方法、 设备及系统, 使得 UE 在 CSFB业务结束后可以回到 CSFB之前注册的 LTE PLMN, 保证 PS业务的 连续性, 避免不必要的 PLMN网间切换, 提升用户体验。
本发明的一方面, 提供一种回归长期演进 LTE网络的方法, 所述方法包 括:
基站获知用户设备 UE的电路域回落 CSFB业务结束;
所述基站接收服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所述 UE注册的 LTE网络的公共陆地移动网络 PLMN标识 ID;
根据所述 PLMN ID, 确定 LTE频段信息;
将包含所述 LTE频段信息的连接释放消息发送给所述 UE。
根据本发明的第一方面, 在一种可能的实现方式中, 所述基站获知用户 设备 UE的电路域回落 CSFB业务结束, 包括: 接收所述服务 MSC/VLR发送 的包含有 CSFB指示的连接释放消息。 根据本发明的第一方面和上述可能的实现方式, 在另一种可能的实现方 式中, 若所述服务 MSC/VLR 是所述 UE 注册的 MSC/VLR, 则所述服务 MSC/VLR从所述 UE的注册信息中获取所述 UE注册的 LTE网络的 PLMN ID;
若所述服务 MSC/VLR不是所述 UE注册的 MSC/VLR, 则所述 UE注册 的 LTE 网络的 PLMN ID 由所述 UE 注册的 MSC/VLR发送给所述服务 MSC/VLR0
根据本发明的第一方面和上述可能的实现方式, 在另一种可能的实现方 式中, 所述包含所述 LTE频段信息的连接释放消息中还包含所述 PLMN ID。
本发明的第二方面, 提供一种回归 LTE网络的方法, 所述方法包括: 用户设备 UE接收基站发送的包含 LTE频段信息的连接释放消息; 驻留到所述 LTE频段信息所指定频段上的小区, 选择所述小区的系统广 播信息中包含的公共陆地移动网络 PLMN标识 ID对应的 LTE PLMN。
结合本发明的第二方面, 在一种可能的实现方式中, 所述 LTE频段信息 指定频段上的合适小区的系统广播信息中仅包含一个 PLMN ID; 所述选择所 述小区的系统广播信息中包含的 PLMN ID对应的 LTE PLMN包括:
驻留到所述 LTE频段信息指定频段上的小区;
根据所述小区的系统广播信息, 回归到所述小区中的 LTE PLMN。
结合本发明的第二方面, 在另一种可能的实现方式中, 所述连接释放消 息中还包含所述 UE注册的 LTE网络的 PLMN ID; 所述选择所述小区的系统 广播信息中包含的 PLMN ID对应的 LTE PLMN , 包括:
读取所述小区的所述系统广播信息, 所述系统广播信息中包含至少两个
PLMN ID;
从所述至少两个 PLMN ID中选择所述连接释放消息中包含的 PLMN ID 对应的所述 LTE PLMN。
本发明的第三方面, 提供一种回归 LTE网络的方法, 所述方法包括: 用户设备 UE接收基站发送的包含 LTE频段信息的连接释放消息; 驻留到所述 LTE频段信息所指定频段上的小区;
读取所述小区的系统广播信息中包含的公共陆地移动网络 PLMN 标识
ID;
从所述 PLMN ID中选择所述 UE预存的 PLMN ID对应的 LTE PLMN, 所述 PLMN ID由所述 UE在注册到 LTE PLMN时保存到所述 UE中。
本发明的第四方面, 提供一种基站, 包括:
获知单元, 用于获知用户设备 UE的电路域回落 CSFB业务结束; 接收单元, 用于接收服务移动交换中心 /拜访位置寄存器 MSC/VLR发送 的所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID;
确定单元, 用于根据所述接收单元接收的 PLMN ID确定 LTE频段信息; 发送单元, 用于将包含所述确定单元确定的所述 LTE频段信息的连接释 放消息发送给所述 UE。
结合本发明的第四方面, 在一种可能的实现方式中, 所述获知单元具体 用于: 接收所述服务 MSC/VLR发送的包含有 CSFB指示的连接释放消息。
结合本发明的第四方面和上述可能的实现方式, 在另一种可能的实现方 式中, 所述包含所述 LTE频段信息的连接释放消息中还包含所述 PLMN ID。
本发明的第五方面, 提供一种 UE, 包括:
接收单元, 用于接收基站发送的包含长期演进 LTE频段信息的连接释放 消息;
回归单元, 用于驻留到所述接收单元接收到的所述 LTE频段信息所指定 频段上的小区, 选择所述小区的系统广播信息中包含的公共陆地移动网络
PLMN标识 ID对应的 LTE PLMN。
结合本发明的第五方面, 在一种可能的实现方式中, 所述连接释放消息 中还包含所述 UE注册的 LTE网络的 PLMN ID; 所述回归单元包括:
读取子单元, 用于读取所述小区的所述系统广播信息, 所述系统广播信 息中包含至少两个 PLMN ID;
选择子单元, 用于从所述读取子单元读取到的至少两个 PLMN ID中选择 所述连接释放消息中包含的 PLMN ID对应的所述 LTE PLMN。
本发明的第六方面, 提供一种 UE, 包括:
接收单元, 用于接收基站发送的包含长期演进 LTE频段信息的连接释放 消息;
驻留单元, 用于驻留到所述接收单元接收的所述 LTE频段信息指定频段 上的小区;
读取单元, 用于读取所述驻留单元驻留的小区的系统广播信息中包含的 公共陆地移动网络 PLMN标识 ID;
选择单元, 用于从所述读取单元读取到的 PLMN ID中选择所述 UE预存 的 PLMN ID对应的 LTE PLMN, 所述 PLMN ID由所述 UE在注册到 LTE PLMN时保存到所述 UE中。
本发明的第七方面, 提供一种基站, 包括:
接收器, 用于获知用户设备 UE的电路域回落 CSFB业务结束; 还用于接 收服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所述 UE注册的长期 演进 LTE网络的公共陆地移动网络 PLMN标识 ID;
处理器, 用于根据所述接收器接收的 PLMN ID确定 LTE频段信息; 发送器, 用于将包含所述处理器确定的所述 LTE频段信息的连接释放消 息发送给所述 UE。
结合本发明的第七方面, 在一种可能的实现方式中, 所述接收器具体用 于: 接收所述服务 MSC/VLR发送的包含有 CSFB指示的连接释放消息。
结合本发明的第七方面和上述可能的实现方式, 在一种可能的实现方式 中, 所述包含所述 LTE频段信息的连接释放消息中还包含所述 PLMN ID。
本发明的第八方面, 提供一种 UE, 包括:
接收器, 用于接收基站发送的包含长期演进 LTE频段信息的连接释放消 息;
处理器, 用于驻留到所述接收器接收到的所述 LTE频段信息所指定频段 上的小区, 选择所述小区的系统广播信息中包含的公共陆地移动网络 PLMN
ID对应的 LTE PLMN。
结合本发明的第八方面, 在一种可能的实现方式中, 所述 LTE频段信息 指定频段上的小区的系统广播信息中仅包含一个 PLMN ID;
所述处理器, 还用于驻留到所述接收器接收的所述 LTE频段信息指定频 段上的小区;根据驻留的所述小区的系统广播信息,回归到所述小区中的 LTE
PLMNo
结合本发明的第八方面, 在另一种可能的实现方式中, 所述连接释放消 息中还包含所述 UE注册的 LTE网络的 PLMN ID;
所述处理器, 还用于读取驻留的所述小区的所述系统广播信息, 所述系 统广播信息中包含至少两个 PLMN ID; 从所述至少两个 PLMN ID中选择所 述连接释放消息中包含的 PLMN ID对应的所述 LTE PLMN。
本发明的第九方面, 提供一种 UE, 包括: 接收器, 用于接收基站发送的包含长期演进 LTE频段信息的连接释放消 息;
处理器, 用于驻留到所述接收器接收的所述 LTE频段信息指定频段上的 小区;
存储器,用于保存所述 UE注册的 LTE公共陆地移动网络 PLMN标识 ID, 所述 PLMN ID由所述 UE在注册到 LTE PLMN时保存到所述存储器中;
所述接收器, 还用于接收驻留到的所述小区的系统广播信息;
所述处理器, 还用于读取所述接收器接收到的所述小区的系统广播信息 中包含的 PLMN ID, 选择所述存储器中预存的所述 PLMN ID对应的 LTE PLMNo
本发明的第十方面, 提供一种回归长期演进 LTE网络的系统, 包括: 服 务 MSC/VLR、 基站以及 UE;
所述服务 MSC/VLR, 用于在所述 UE的电路域回落 CSFB业务结束后, 向所述基站发送所述 UE注册的 LTE公共陆地移动网络 PLMN标识 ID;
所述基站, 用于获知用户设备 UE的电路域回落 CSFB业务结束;接收服 务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所述 UE注册的 LTE网络 的公共陆地移动网络 PLMN标识 ID; 根据所述 PLMN ID, 确定 LTE频段信 息; 将包含所述 LTE频段信息的连接释放消息发送给所述 UE;
所述 UE, 用于接收基站发送的包含 LTE频段信息的连接释放消息; 驻留到所述 LTE频段信息所指定频段上的小区, 选择所述小区的系统广 播信息中包含的公共陆地移动网络 PLMN标识 ID对应的 LTE PLMN。
本发明的第十一方面, 还提供一种回归长期演进 LTE网络的方法, 所述 方法包括: 在电路域回落 CSFB过程中用户设备 UE接收移动管理网元发送的包含所 述 UE注册的 LTE网络的公共陆地移动网络 PLMN标识 ID的等价 PLMN列 表;
所述 UE接收基站发送的包含 LTE频段信息的信令释放消息;
驻留到所述 LTE频段信息所指定频段上的小区;
从所述小区的系统广播信息包含的至少一个 PLMN ID 中选择所述等价 PLMN列表中包含的 PLMN ID对应的 LTE PLMN。
本发明的第十二方面, 提供一种 UE, 包括:
接收单元, 用于在电路域回落 CSFB 过程中接收移动管理网元发送的包 含所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID的等 价 PLMN列表;
所述接收单元, 还用于接收基站发送的包含 LTE频段信息;
驻留单元, 用于驻留到所述接收单元接收到的 LTE频段信息所指定频段 上的小区;
选择单元, 用于从所述驻留单元驻留的小区的系统广播信息包含的至少 一个 PLMN ID中选择搜索等价 PLMN列表中包含的 PLMN ID对应的 LTE PLMNo
本发明的第十三方面, 提供一种 UE, 包括:
接收器, 用于在电路域回落 CSFB 过程中接收移动管理网元发送的包含 所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID的等价 PLMN列表;
所述接收器, 还用于接收基站发送的包含 LTE频段信息;
处理器, 用于驻留到所述接收器接收到的 LTE频段信息所指定频段上的 小区; 从所述小区的系统广播信息包含的至少一个 PLMN ID中选择所述等价 PLMN列表中包含的 PLMN ID对应的 LTE PLMN。
本发明实施例提供的回归 LTE 网络的方法、 设备及系统, 通过获取 UE 注册的 PLMN ID, 确定 UE注册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业务结束后回归到该指定 LTE频段上的 LTE PLMN,与现有技术 中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以指定 UE 发起 CSFB之前所注册的 LTE PLMN所支持的 LTE频段, 从而确保将 UE重 定向回之前注册的 LTE PLMN, 既减少不必要的 PLMN网间切换, 又可以恢 复在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。
附图说明 施例或现有技术描述中所需要使用的附图作筒单地介绍, 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, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明一实施例提供的一种回归 LTE网络的方法流程图; 图 2为本发明另一实施例提供的一种回归 LTE网络的方法流程图; 图 3为本发明另一实施例提供的一种回归 LTE网络的方法流程图; 图 4为本发明另一实施例提供的一种回归 LTE网络的方法流程图; 图 5为本发明另一实施例提供的一种回归 LTE网络的方法流程图; 图 6为本发明另一实施例提供的一种基站组成示意图;
图 7为本发明另一实施例提供的一种 UE组成示意图;
图 8为本发明另一实施例提供的一种 UE组成示意图; 图 9为本发明另一实施例提供的一种基站组成示意图;
图 10为本发明另一实施例提供的一种 UE组成示意图;
图 11为本发明另一实施例提供的一种 UE组成示意图;
图 12为本发明另一实施例提供的一种回到 LTE网络的系统组成示意图; 图 13为本发明另一实施例提供的一种回归 LTE网络的方法流程图; 图 14为本发明另一实施例提供的一种 UE组成示意图;
图 15为本发明另一实施例提供的一种 UE组成示意图。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 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作 出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
本说明书中所描述的 LTE网络, 即为演进的 UMTS陆地无线接入网 (英 文全称为 Evolved UMTS Territorial Radio Access Network , 英文筒称为 E-UTRAN , 其中 UMTS 的中文全称为通用移动通信系统, 英文全称为 Universal Mobile Telecommunications System ) , 2G网给即为 GSM/EDGE无 线接入网 (英文全称为 GSM/EDGE Radio Access Network , 英文筒称为 GERAN, 其中 GSM 的中文全称为全球移动通讯系统, 英文全称为 Global System of Mobile communication, EDGE的中文全称为增强型数据速率 GSM 演进技术, 英文全称为 Enhanced Data Rate for GSM Evolution ) , 3G网络即 为 UTRAN网络。 LTE网络的 PLMN仅提供 PS域服务, 而 2G/3G网络中既
PLMNo 在本发明实施例中, 用户设备 ( User Equipment, 筒称 UE )可以为以下 任意一种, 并且 UE可以是静态的, 也可以是移动的。 静止的 UE可以包括为 终端(Terminal ), 移动台 ( Mobile Station )、 用户单元( Subscriber Unit )或站 台 (Station )等。 移动的 UE可以包括蜂窝电话(Cellular Phone )、 个人数字 助理 ( Personal Digital Assistant, PDA ), 无线调制解调器(modem ), 无线通 信设备、 手持设备(handheld ), 膝上型电脑 (Laptop Computer ), 无绳电话 ( Cordless Phone )或无线本地环路 ( Wireless Local Loop, WLL ) 台等。 上述 UE可以分布于整个无线网络中。
为了便于本领域技术人员的理解, 下面以具体的应用实例来说明。 需要 说明的是, 在本发明实施例中, 基站可以为 2G 网络中的基站子系统(Base Station Subsystem, BSS ), 或 3G 网络中的无线网络子系统 (Radio Network Subsystem, RNS)。 移动管理网元可以为移动交换中心 (Mobile Switching Centre, MSC ) /拜访位置寄存器 ( Visitors Location Register, VLR ), 或移动 管理实体( Mobility Management Entity, MME),或服务 GPRS支持节点( Serving GPRS Support Node, SGSN )中的任一种, MSC与 VLR通常合设为同一网元, 称为 MSC/VLR , 或筒称为 VLR。
由于 LTE网络只支持 PS数据业务, UE在 LTE网络里进行数据业务或者 处于空闲状态时, 此时若该 UE要发起或者接收电路域业务(包括语音呼叫、 补充业务和位置服务等 ), 则需要执行电路域回退( Circuit Service Fall Back, CSFB )流程将 UE从 LTE回退到 2G/3G, 以便 UE在 2G/3G网络中完成电路 域业务。在电路域业务结束后( UE在 2G/3G网络中因 CSFB业务建立的底层 链路被释放意味着电路域业务结束)终端需要回到 LTE网络, 以继续在 LTE 网络进行数据业务。 本发明实施例中, CSFB业务, 具体指驻留在 LTE网络 的 UE因需要执行电路域 CS业务而发起 CSFB流程回落到 2G/3G网络后执行 的 CS业务, 所述 CSFB业务包括上行 CSFB业务与下行 CSFB业务, 例如 UE在 LTE网络接收到一个语音呼叫或者发起一个语音呼叫等。
在 UE内部, 按照处理和控制的消息对象不同, 可以将 UE内部分为接入 层 ( Access Stratum, AS )和非接入层 ( Non- Access Stratum, NAS )。 其中, AS负责接收 RR/RRC连接释放消息, 根据频段选择合适小区并驻留, 读取小 区系统广播消息, 获取可用的 PLMN ID, 然后上报给 NAS。 NAS根据 AS层 上报的可用 PLMN ID, 决定是否执行 PLMN选择。
本发明一实施例提供一种回归 LTE网络的方法, 应用于用户设备 UE的 电路域回落 CSFB业务结束后, 如图 1所示, 该方法包括:
A01、 基站获知用户设备 UE的电路域回落 CSFB业务结束。
A02、所述基站接收服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的 所述 UE注册的 LTE网络的公共陆地移动网络 PLMN标识 ID。
其中, 若所述服务 MSC/VLR是所述 UE注册的 MSC/VLR, 则所述服务 MSC/VLR从所述 UE的注册信息中获取所述 UE注册的 LTE网络的 PLMN ID。 若所述服务 MSC/VLR不是所述 UE注册的 MSC/VLR,则所述 UE注册的 LTE 网络的 PLMN ID由所述 UE注册的 MSC/VLR发送给所述服务 MSC/VLR。
A03、 根据所述 PLMN ID确定 LTE频段信息。
其中, 所确定的 LTE频段信息, 是所述 PLMN ID对应的 PLMN所支持 的 LTE频段信息, 可选地, 所确定的 LTE频段信息也可以是其它 PLMN所支 持的 LTE频段信息。
A04、 将包含所述 LTE频段信息的连接释放消息发送给所述 UE。
其中,基站将包含所述 LTE频段信息的连接释放消息发送给所述 UE, 以 便所述 UE驻留到所述 LTE频段信息所指定频段上的小区, 并选择所述小区 的系统广播信息中包含的 PLMN ID对应的 LTE PLMN。
进一步可选的, 所述连接释放消息中可以还包含所述 UE注册的 LTE网 络的 PLMN ID,以便所述 UE驻留到所述 LTE频段信息所指定频段上的小区, 并在所述小区的系统广播信息中包含至少两个 PLMN ID时选择所述连接释放 消息中包含的 PLMN ID对应的 LTE PLMN。
本发明实施例提供的回归 LTE网络的方法, 通过获取 UE注册的 PLMN ID, 确定 UE注册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业 务结束后回归到该指定 LTE频段上的 LTE PLMN, 与现有技术中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以指定 UE在发起 CSFB 业务之前注册的 LTE PLMN所支持的 LTE频段, 从而确保将 UE重定向回之 前注册的 LTE PLMN, 既减少不必要的 PLMN网间切换, 又可以恢复在之前 注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。
本发明另一实施例提供一种回归 LTE 网络的方法, 应用于用户设备 UE 的电路域回落 CSFB业务结束后, 如图 2所示, 该方法包括:
B01、 UE接收基站发送的包含 LTE频段信息的连接释放消息; 所述 LTE 频段信息由所述基站根据所述 UE 注册的 LTE 网络的公共陆地移动网络 PLMN标识 ID确定。
B02、驻留到所述 LTE频段信息所指定频段上的小区,选择所述小区的系 统广播信息中包含的 PLMN ID对应的 LTE PLMN。
进一步可选的,所述连接释放消息中还可以包含所述所述 UE注册的 LTE 网络的 PLMN ID; 所述驻留到所述 LTE频段信息所指定频段上的小区, 并选 择所述小区的系统广播信息中包含的 PLMN ID对应的 LTE PLMN, 包括: 在 所述 LTE频段信息所指定频段上搜索到小区并驻留到所述小区; 读取所述小 区的系统广播信息, 所述系统广播信息中包含至少两个 PLMN ID; 从所述至 少两个 PLMN ID中选择所述 UE注册的 LTE网络的 PLMN ID对应的 LTE PLMNo
本发明实施例提供的回归 LTE网络的方法, 通过获取 UE注册的 PLMN ID, 确定 UE注册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业 务结束后回归到该指定 LTE频段上的 LTE PLMN, 与现有技术中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以指定 UE在 CSFB之前 注册的 LTE PLMN所支持的 LTE频段, 从而确保将 UE重定向回之前注册的 LTE PLMN,既减少不必要的 PLMN网间切换,又可以恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。 本发明另一实施例提供一种回归 LTE网络的方法, 如图 3所示, 包括: 101、 UE发起联合注册并成功注册到支持 LTE网络的 PLMN1与支持 CS 网络的 PLMN2。
其中,驻留在 E-UTRAN且支持 CSFB的 UE需要发起联合注册流程实现 到 EPC网络 PS域与 CS网络 CS域的同时注册。在 UE注册到 PS域网络( LTE PLMN1 ) 时, PLMN2中的源 MSC/VLR可以获取 PLMN1的 PLMN ID1。
在联合注册流程中, 网络侧为 UE选取源 MSC/VLR: UE注册到 CS域网 络(CS PLMN2 )时, 移动管理实体 ( Mobile Managenment Entity, MME )选 更新请求以建立 SGs关联。 源 MSC/VLR向归属位置寄存器( Home Location Register, HLR )发送注册请求并获取 UE的 CS域签约数据, 实现 UE在 CS 域的注册。 可选的, 在未部署 MSC资源池( MSC pool ) 的场景下, MME根 据 UE当前所在位置信息选择一个可服务的 MSC/VLR; 在部署了 MSC资源 池( MSC pool )的场景下, MME ^据 UE当前所在位置信息与国际移动用户 标识 ( International Mobile Subscriber Identity, IMSI )哈希表从 MSC pool里选 择一个服务 MSC/VLR。
102、 UE在 PLMN1发起 CSFB, 并成功回落到 PLMN2的 CS网络。 其中, 在成功实现联合注册后, CSFB业务才能正常发起。 在 UE发起上 下行 CSFB流程中, LTE网络中的 MME为 UE选择一个 CS服务 PLMN ID 并将选择的 CS服务 PLMN ID发给 LTE网络中的基站 ( eNodeB ), 旨在告知 eNodeB应该将 UE切换到 CS PLMN ID对应的 CS域网络中。 UE切换到 CS 网络后, 便可发起 CS域业务。 例如 UE在发起的 CS语音呼叫建立流程中, 可以发送 CSFB指示给服务 MSC/VLR, 所述 CSFB指示用于指示本次语音呼 叫是因在 LTE网络中执行 CSFB所触发的。 CS语音呼叫连接建立成功后, UE 进行语音呼叫。
103、 源 MSC/VLR向服务 MSC/VLR发送 PLMN ID1。
其中,步骤 103为可选步骤,如果 UE回落到 2G/3G网络的服务 MSC/VLR 是所述源 MSC/VLR, 则不用执行步骤 103。 仅当 UE的服务 MSC/VLR不是 步骤 101中所注册的源 MSC/VLR时执行步骤 103。
其中,在步骤 101的联合注册过程中, 源 MSC/VLR可以从注册信息中获 取 UE注册的 PLMN ID1。 例如, 在联合注册过程中, MME会将其 MME名 称( name )发送给源 MSC/VLR,在 MME名称中包含有 UE注册的 PLMN ID1。 或者,在联合注册流程中, MME可以向源 MSC/VLR发送跟踪域标识( Tracking Area Identity, TAI ) 或 E-UTRAN 小区全局标识符 (E-UTRAN Cell Global Identity, ECGI) , 在 TAI或 ECGI中均包含 UE注册的 PLMN ID1。 在本实施例中, 如果 UE回落到 2G/3G网络后进入另一个 MSC/VLR, 即 目标 MSC/VLR的服务范围内, 则 UE在与目标 MSC/VLR的位置更新过程中 会将源 MSC/VLR的位置信息上报给目标 MSC/VLR。 然后, 目标 MSC/VLR 根据 UE 上报的位置信息向源 MSC/VLR 发送移动应用部分 (Mobile Application Part, MAP )协议发送身份请求消息( SEND IDENTIFICATION ), 请求获取 UE注册的 PLMN ID,源 MSC/VLR在 MAP协议发送身份响应消息 中, 向目标 MSC/VLR发送在步骤 101中获取到的 UE注册的 PLMN ID1。 需 要说明的是, 所述目标 MSC/VLR, 即为步骤 3中的服务 MSC/VLR。
104、 UE在 PLMN2进行 CS域业务。
其中, CSFB后进行的 CS域业务可以包括发起或接收语音呼叫、 补充业 务和位置服务等。
105、 当 UE的 CS域业务结束后,服务 MSC/VLR向基站发送 CSFB指示 和 PLMN ID1 , 即基站获知 UE的 CSFB业务结束。
其中, 在 UE的 CS域业务结束后, 服务 MSC/VLR向基站发起连接连接 释放流程, 在连接连接释放消息中携带 CSFB指示和 PLMN ID1。 所述 CSFB 指示用于指示当前 UE的 CS域业务是由于 CSFB引起的, 在所述 CS域业务 结束后, 需要将该 UE重定向回到 LTE网络; 并且, 在重定向回到 LTE网络 时根据 PLMN ID1 回归到 PLMN ID1 对应的 LTE PLMN。 可选地, 服务 MSC/VLR可以直接将包含 UE注册的 PLMN ID1的跟踪域标识( Tracking Area Identity, TAI )或 E-UTRAN 小区全局标识符 (E-UTRAN Cell Global Identity, ECGI)发给基站。
106、 基站根据 PLMN ID1确定 LTE频段 1。 其中,基站可以根据当前为 UE提供 CS域服务的 PLMN ID2和接收到的 PLMN ID1查询预先配置的 LTE频段支持信息, 确定 PLMN1所支持的 LTE 频段 1信息。其中,所确定的 LTE频段 1信息,是所述 PLMN IDl对应的 PLMN1 所支持的 LTE频段 1信息, 可选地, 所确定的 LTE频段 1信息也可以是其它 PLMN所支持的 LTE频段信息
107、 基站向 UE发送连接释放消息, 其中所述连接释放消息中包含 LTE 频段 1信息。
本申请说明书中提及的连接释放消息可以为无线资源 ( Radio Resource, RR )连接释放 (release)消息,或者无线资源控制( Radio Resource Control, RRC ) 连接释放消息, 或者其他用于辅助无线资源释放的消息。 其中, 如果所述基 站是 BSS , BSS向 UE发送 RR连接释放消息, 在 RR连接释放消息中包含重 定向指示,用于指示 UE释放 RR连接后重定向回归到 LTE网络; 并且以 LTE 频段 1信息作为所述重定向指示的内容, 用于指示 UE重定向回归到 LTE频 段 1对应的 LTE网络。 如果所述基站是 RNS, RNS向 UE发送 RRC连接释 放消息,在 RRC连接释放消息中包含重定向指示,用于指示 UE释放 RRC连 接后重定向回归到 LTE网络; 并且以 LTE频段 1信息作为所述重定向指示的 内容, 用于指示 UE重定向回归到 LTE频段 1对应的 LTE网络。
108、 UE在 LTE频段 1上搜索合适小区 ( Suitable Cell )并驻留。
其中, UE在释放当前 RR/RRC连接后, 根据重定向指示中指定的 LTE 频段 1信息, 在 LTE频段 1上搜索合适小区, 并驻留到 LTE频段 1上搜索到 的合适小区中。所述合适小区是 UE能够驻留并能够获取正常业务的小区。在 实际应用中,可能出现 LTE频段 1上搜索到的小区 UE不能获取正常业务(例 如只能获取紧急业务), 即为非合适小区, 这种情况下 UE可以在全部频段上 重新搜索合适小区, 但不在本发明实施例考虑范围内, 遂不予赘述。
109、 UE读取小区系统广播信息,选择系统广播信息中包含的 PLMN ID1 对应的 LTE PLMN1。
在本实施例中, 若 UE在 LTE频段 1上搜索到的合适小区是一个非共享 小区, 即该小区的系统广播信息中仅包含一个 PLMN ID, UE读取小区的系 统广播信息后, 仅可以获取到 LTE PLMN1的 ID, 从而选择 PLMN1进行 PS 域的接入。 由于 LTE频段 1信息是根据 UE注册的 PLMN ID1确定的, 因此 UE驻留到步骤 107中接收到的 LTE频段 1信息指定频段上的小区,并选择该 小区的系统广播信息中包含的 PLMN ID1,即为回归到 CSFB之前注册的 LTE PLMN1。 当然, 若 UE在 LTE频段 1上搜索到的合适小区是一个共享小区, 即该小区的系统广播消息中包含至少两个 PLMN ID , 则可以采用传统的 PLMN选择机制选择一个 PLMN或随机选择一个 PLMN。
藉此, UE已经回归到 CSFB之前注册的 LTE PLMN1 ,后续如果 UE要进 行 PS业务, 则可以在 PLMN1中发起连接建立流程。
110、 UE发起联合跟踪区域更新 ( Tracking Area Updating, TAU )流程恢 复 PLMN1中被挂起的数据业务。
其中, 在 UE选择 PLMN1后, 可以不用发起完整的 LTE注册流程, 而是 执行联合 TAU流程, 从而减少回归 LTE网络所带来的信令开销。 并且, 如果 UE在 CSFB之前在 PLMN1中正在执行 PS数据业务,由于 CSFB被中断而挂 起。 传统回归 LTE网络的机制中, 如果不能回归到 PLMN1 , 则该被挂起的数 据业务会被删除并终止,用户需要重新发起数据业务;本发明提供的回归 LTE 网络的机制中, 回归到 CSFB之前注册的 LTE PLMN1 , 则可以恢复被挂起的 数据业务, 提高用户体验。 可选地, 在执行完本实施例步骤 105后, 若 UE当前处于 PS域连接态, 所述基站可以发起 PS切换流程将 UE切换回之前注册的 LTE PLMN, 在执行 PS 切换时, 所述基站在选择目标小区时考虑所述 PLMN ID。所述 UE执行基 站所发起的切换流程, 从而回到之前注册的 LTE PLMN。 需要说明的是, 若 基站在步骤 105后发起了 PS切换流程, 则将不执行步骤 106到步骤 109, 在 PS切换流程完成后直接执行步骤 110。
本发明实施例提供的回归 LTE网络的方法, 通过获取 UE注册的 PLMN ID, 确定 UE注册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业 务结束后回归到该指定 LTE频段上的 LTE PLMN, 与现有技术中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以指定 UE在 CSFB之前 所注册的 LTE PLMN所支持的 LTE频段, 从而确保将 UE重定向回之前注册 的 LTE PLMN, 既减少不必要的 PLMN网间切换, 又可以恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。 为了在 UE搜索到的合适小区是共享小区的情况下 ,也能确保 UE可以回 归到 CSFB之前所注册的 LTE PLMN, 本发明的另一实施例还提供一种回归 LTE网络的方法, 如图 4所示, 包括:
201、 UE发起联合注册并成功注册到支持 LTE网络的 PLMN1与支持 CS 网络的 PLMN2。
202、 UE在 PLMN1发起 CSFB, 并成功回落到 PLMN2的 CS网络。 203、 源 MSC/VLR向服务 MSC/VLR发送 PLMN ID1。
其中, 步骤 203为可选步骤, 仅当 UE的服务 MSC/VLR不是步骤 201中 所注册的源 MSC/VLR时执行步骤 203。 204、 UE在 PLMN2进行 CS域业务。
205、 当 UE的 CS域业务结束后,服务 MSC/VLR向基站发送 CSFB指示 和 PLMN ID1。
其中, 在 UE的 CS域业务结束后, 服务 MSC/VLR向基站发起连接连接 释放流程, 在连接连接释放消息中携带 CSFB指示和 PLMN ID1。 所述 CSFB 指示用于指示当前 UE的 CS域业务是由于 CSFB引起的, 在所述 CS域业务 结束后, 需要将该 UE重定向回到 LTE网络; 并且, 在重定向回到 LTE网络 时根据 PLMN ID1 回归到 PLMN ID1 对应的 LTE PLMN。 可选地, 服务 MSC/VLR可以直接将包含 UE注册的 PLMN ID1的跟踪域标识( Tracking Area Identity, TAI )或 E-UTRAN 小区全局标识符 (E-UTRAN Cell Global Identity, ECGI)发给基站。
206、 基站根据所述 PLMN ID1确定 LTE频段 1信息。
其中, 所确定的 LTE频段 1信息, 是所述 PLMN ID1对应的 PLMN1所 支持的 LTE频段信息,可选地,所确定的 LTE频段 1信息也可以是其它 PLMN 所支持的 LTE频段信息。
其中,步骤 201-206与图 3所示实施例中的步骤 101-106的实现方式类似, 在此不再赘述。
207、 基站向 UE发送连接释放消息, 其中所述连接释放消息中包含 LTE 频段 1和 PLMN ID1。
其中, 所述 LTE频段 1和 PLMN ID1可以携带在 RR/RRC连接释放消息 中, 所述 LTE频段 1作为重定向指示, 用于指示 UE释放该 RR/RRC连接后 需要回归到 LTE网络, 并且根据 PLMN ID1和重定向指示中包含的 LTE频段 1回归到 PLMN ID1对应的 LTE PLMN1。 208、 UE在 LTE频段 1上搜索合适小区并驻留。
其中, 与图 3所示实施例中的步骤 109类似, UE在释放当前 RR/RRC连 接后, 根据重定向指示中指定的 LTE频段 1信息, 在 LTE频段 1上搜索合适 小区并驻留。 此时 UE驻留的小区可以是共享小区, 也可以是非共享小区。
209、 读取小区系统广播信息, 选择 PLMN IDl对应的 PLMN1。
其中, UE从小区的系统广播信息中可以读取到当前可用的 PLMN, 本申 请说明书中提及的可用的 PLMN是指 UE在所驻留的小区的系统广播消息中 读取的 PLMN ID所对应的 PLMN。 若 UE从小区的系统广播信息中仅读取到 一个 PLMN ID, 且该 PLMN ID为 PLMN IDl , 即驻留到的小区是非共享小区 且 PLMN1可用, UE可以直接回归到 PLMN1。 若 UE从小区的系统广播信息 中读取到至少两个 PLMN ID, 即驻留到的小区是共享小区, 即从系统广播信 息中读取到至少两个 PLMN ID ,且所述至少两个 PLMN ID中包含 PLMN ID 1 , 即 LTE PLMN1可用, 则选择 PLMN IDl对应的 PLMN1 , 藉此 UE回归到了 发起 CSFB之前所注册的 LTE PLMN1。
可以理解的是,如果 UE读取的小区系统广播信息后获取的可用的 PLMN ID中没有 UE注册的 PLMN IDl , 即 LTE PLMN1不可用, 则 UE可以放弃回 归到之前注册的 LTE PLMN1 , 而选择其他可用的 LTE PLMN。
具体的, AS层获取系统广播消息中携带的 PLMN ID, 以及基站发送的 PLMN IDl , 将 PLMN IDl与系统广播信息中的 PLMN ID进行匹配, 确定 PLMN1可用则仅向 NAS层上报 PLMN IDl ,使得 NAS仅获得一个可用 PLMN IDl , 从而直接选择 PLMN IDl对应的 PLMN1 , 即回归到 CSFB之前注册的 LTE网络。 当然,如果系统广播信息中不包含 PLMN IDl , 即 PLMN1不可用, 则表示 UE可能已离开 PLMN1的覆盖范围, 不能回到 PLMN1 中, 因此 AS 层可以上报系统广播消息中获取的其它 PLMN ID, 以便 NAS层执行正常的 PLMN选择流程回到 LTE网络。
210、 回归到 PLMN1后, 发起联合 TAU流程恢复 PLMN1中被挂起的数 据业务。
需要说明的是, 本发明实施例中各步骤的具体解释可以参考本说明书中 其他实施例中的对应内容, 在此不再赘述。
可选地, 在执行完本实施例步骤 205后, 若 UE当前处于 PS域连接态, 所述基站可以发起 PS切换流程将 UE切换回之前注册的 LTE PLMN, 在执行 PS 切换时, 所述基站在选择目标小区时考虑所述 PLMN ID。所述 UE执行基 站所发起的切换流程, 从而回到之前注册的 LTE PLMN。 需要说明的是, 若 基站在步骤 205后发起了 PS切换流程, 则将不执行步骤 206到步骤 209, 在 PS切换流程完成后直接执行步骤 210。
本发明实施例提供的回归 LTE网络的方法, 通过获取 UE注册的 PLMN ID, 确定 UE注册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业 务结束后回归到该指定 LTE频段并指定 PLMN ID的 LTE PLMN,与现有技术 中回归到 CS PLMN所支持 LTE频段上的 LTE PLMN相比, 可以指定 UE之 前注册的 LTE频段和 PLMN ID, 从而确保将 UE重定向回之前注册的 LTE PLMN, 既减少不必要的 PLMN 网间切换, 又可以继续在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。
并且, 即使指定 LTE频段上有至少两个可用 PLMN, 也可以将 UE重定 向回归到 CSFB之前注册的 LTE PLMN中, 进一步保证了 UE回归到 CSFB 之前注册的 LTE PLMN的精准性。 本发明的另一实施例还提供一种回归 LTE网络的方法,可以仅通过在 UE 侧实现更细粒度的 LTE PLMN 选择, 实现回归到 CSFB 之前注册的 LTE PLMN。 如图 5所示, 该方法包括:
301、 UE发起联合注册流程并成功注册到支持 LTE网络的 PLMN1与支 持 CS网络的 PLMN2, 在联合注册的过程中 UE存储 PLMN1对应的 PLMN ID1。
其中, UE在注册到 PLMN1的过程中, MME会为 UE分配一个合法的全 局唯一临时标识( Globally Unique Temporary Identity, GUTI )和 TAI, 在所述 GUTI和 TAI中均包含有 PLMN1的标识( PLMN ID1 )。
302、 UE在 PLMN1发起 CSFB, 并成功回落到 PLMN2的 CS网络。
303、 UE在 PLMN2进行 CS域业务。
其中, 步骤 302与图 3所示实施例的步骤 102的实现方式类似, 步骤 303 与图 3所示实施例的步骤 104的实现方式类似, 在此不再赘述。
304、在 UE的 CS域业务结束后,服务 MSC/VLR向基站发送 CSFB指示。 其中, 所述 CSFB指示用于指示当前 UE的 CS域业务是由于 CSFB引起 的, 在所述 CS域业务结束后, 需要将该 UE重定向回到 LTE网络。
305、 基站确定 PLMN2对应的 LTE频段 2。
其中, 基站接收到 CSFB指示后由于需要将该 UE重定向回到 LTE网络, 因此根据该 UE当前所在的 CS域网络的 PLMN2,确定 PLMN2所支持的 LTE 频段 2,使得 UE可以在 LTE频段 2上搜寻到 LTE网络。其中,所确定的 LTE 频段信息, 是所述 PLMN ID对应的 PLMN所支持的 LTE频段信息, 可选地, 所确定的 LTE频段信息也可以是其它 PLMN所支持的 LTE频段信息。
306、 基站向 UE发送连接释放消息, 所述连接释放消息中包含 LTE频段 2信息。
在本实施例中, 重定向指示的内容为 LTE频段 2信息, 用于指示 UE在 LTE频段 2上搜索合适小区, 从而回归到该合适小区中的 LTE网络。
307、 UE在 LTE频段 2上搜索合适小区并驻留。
其中, UE驻留的小区可以是共享小区, 也可以是非共享小区。
308、 UE读取小区系统广播信息,选择预存的 PLMN ID1对应的 PLMN1。 其中, 若 UE从小区的系统广播信息中仅读取到一个 PLMN ID, 即驻留 到的小区是非共享小区, 贝' j UE可以直接回归到 PLMN1。 若 UE从小区的系 统广播信息中读取到至少两个 PLMN ID, 即驻留到的小区是共享小区, 则选 择预存的 PLMN ID1对应的 PLMN1。 为了让 UE可以选回到 CSFB之前所注 册的 LTE网络, UE可以根据步骤 301注册流程中预先存储在 UE中的 PLMN ID1选择之前注册的 LTE PLMNl o
具体的, 在 UE内部按照处理和控制的消息对象不同, 可以将 UE内部分 为接入层 ( Access Stratum, AS )和非接入层 ( Non- Access Stratum, NAS )。 AS层读取系统广播消息中携带的至少两个个 PLMN ID并上报给 NAS层。 NAS层获取预先存储的合法的 GUTI中包含的 PLMN ID1 , 并将 GUTI中的 PLMN ID1与 AS层上报的至少两个个 PLMN ID进行匹配。 若 PLMN ID1在 AS层上报的 PLMN ID中,则直接选择 PLMN ID1 ,从而直接回归到 PLMN ID1 对应的 PLMN1 , 即回归到 CSFB之前注册的 LTE网络。 当然, 如果 AS层上 报的 PLMN ID中不包含 PLMN ID1 , 即 PLMN1不可用, 则表示 UE可能已 离开 PLMN1的覆盖范围, 不能回到 PLMN1 中, 因此 NAS可以执行正常的 PLMN选择流程回到 LTE网络。
可选的, UE也可以获取合法的 TAI中的 PLMN ID1 , 选择 PLMN ID1对 应的 PLMN1 , 也即 CSFB之前注册的 LTE PLMN1。
309、 UE回归到 PLMN1 , 发起联合 TAU流程, 恢复在 PLMN1中被挂起 的数据业务。
需要说明的是, 本发明实施例中各步骤的具体解释可以参考本说明书中 其他实施例中的对应内容, 本发明实施例这里不再反复赘述。
可选地, 在执行完本实施例步骤 304后, 若 UE当前处于 PS域连接态, 所述基站可以发起 PS切换流程将 UE切换回之前注册的 LTE PLMN, 在执行 PS 切换时, 所述基站在选择目标小区时考虑所述 PLMN ID。所述 UE执行基 站所发起的切换流程, 从而回到之前注册的 LTE PLMN。 需要说明的是, 若 基站在步骤 304后发起了 PS切换流程, 则将不执行步骤 305到步骤 308, 在 PS切换流程完成后直接执行步骤 309。
本发明实施例提供的回归 LTE网络的方法, UE通过在重定向回归 LTE 域网络时,选择预先存储的注册 PLMN ID,回归到该 PLMN ID的 LTE PLMN, 回归到 CSFB之前注册的 PLMN ID对应的 LTE PLMN,既减少不必要的 PLMN 网间切换, 又可以恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高 用户体验。 并且, 仅对 UE侧的重选方式进行改进, 对协议的修改较小, 实现 成本较低。 本发明另一实施例还提供一种基站, 如图 6所示, 包括: 接收单元 41、 确定单元 42、 发送单元 43、 获知单元 44。
获知单元 44, 用于获知用户设备 UE的电路域回落 CSFB业务结束。 接收单元 41 ,用于在所述获知单元 44获知所述 UE的 CSFB业务结束后 , 接收用户设备 UE的服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所 述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID;
确定单元 42 , 用于确定所述接收单元 41接收的 PLMN ID对应的 LTE频 段信息;
发送单元 43 , 用于将包含所述确定单元 42确定的所述 LTE频段信息的 连接释放消息发送给所述 UE, 以便所述 UE驻留到所述 LTE频段信息所指定 频段上的小区, 并选择所述小区的系统广播信息中包含的 PLMN ID对应的 LTE PLMNo
进一步的, 所述获知单元 44具体用于: 接收所述服务 MSC/VLR发送的 包含有 CSFB指示的连接释放消息。
进一步的,在实际应用中由于 UE移动或修改配置等原因,可能切换服务 MSC/VLR。 若所述服务 MSC/VLR是所述 UE注册的 MSC/VLR, 则所述服务 MSC/VLR从所述 UE的注册信息中获取所述 PLMN ID;
若所述服务 MSC/VLR不是所述 UE注册的 MSC/VLR,则所述 PLMN ID 由所述 UE注册的 MSC/VLR发送给所述服务 MSC/VLR。
进一步的, 为了保证 LTE频段信息所指定频段上的小区中有至少两个个 PLMN可用的情况下, 可以准确回归到 UE之前注册的 LTE PLMN。所述连接 释放消息还包含所述 PLMN ID, 以便所述 UE驻留到所述 LTE频段信息所指 定频段上的小区, 并在所述小区的系统广播信息中包含至少两个 PLMN ID时 选择所述 PLMN ID对应的 LTE PLMN。
本发明实施例提供的基站, 通过获取 UE注册的 PLMN ID, 确定 UE注 册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业务结束后回归到 该指定 LTE频段上的 LTE PLMN, 与现有技术中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以指定 UE在 CSFB之前所注册的 LTE PLMN所支持的 LTE频段,从而确保将 UE重定向回之前注册的 LTE PLMN, 既减少不必要的 PLMN网间切换, 又可以恢复在之前注册的 LTE PLMN中被 挂起的数据业务, 提高用户体验。
并且, 进一步向 UE发送 UE注册的 PLMN ID, 即使指定 LTE频段上由 至少两个 PLMN, 也可以将 UE重定向回归到 CSFB之前注册的 LTE PLMN 中, 进一步保证了 UE回归到 CSFB之前注册的 LTE PLMN的精准性。 本发明另一实施例还提供一种 UE, 如图 7所示, 包括: 接收单元 51、 回 归单元 52。
接收单元 51 , 用于接收基站发送的包含长期演进 LTE频段信息的连接释 放消息; 所述 LTE频段信息由所述基站根据所述 UE注册的 LTE公共陆地移 动网络 PLMN标识 ID确定;
回归单元 52, 用于驻留到所述接收单元 51接收到的所述 LTE频段信息 所指定频段上的小区, 选择所述小区的系统广播信息中包含的 PLMN ID对应 的 LTE PLMN。
进一步的, 在一种应用场景中, 所述 LTE频段信息指定频段上的小区的 系统广播信息中仅包含一个 PLMN ID; 所述回归单元 52可以具体用于: 在所 述接收单元 51接收的所述 LTE频段信息指定频段上搜索到小区,并驻留到所 述 LTE频段信息指定频段上的小区; 读取所述小区的系统广播信息, 从所述 系统广播信息中获取可用的 PLMN ID; 从而回归到 UE发起 CSFB之前所注 册的 LTE PLMNo
在另一种应用场景中, 所述 LTE频段信息指定频段上的小区的系统广播 信息中包含至少两个 PLMN ID; 为了保证 LTE频段信息所指定频段上的小区 中有至少两个个 PLMN可用的情况下, 可以准确回归到 UE之前注册的 LTE PLMN,所述连接释放消息还可以包含 PLMN ID;所述回归单元 52可以包括: 读取子单元 521和选择子单元 522。
读取子单元 521 , 用于读取所述小区的所述系统广播信息, 所述系统广播 信息中包含至少两个 PLMN ID;
选择子单元 522 ,用于从所述读取子单元 521读取到的至少两个 PLMN ID 中选择所述连接释放消息中包含的 PLMN ID对应的所述 LTE PLMN。
本发明实施例提供的 UE, 通过获取 UE注册的 LTE PLMN支持的 LTE 频段信息, 在 CSFB业务结束后回归到该指定 LTE频段上的 LTE PLMN, 与 现有技术中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以 指定 UE CSFB之前所注册的 LTE PLMN所支持的 LTE频段,从而确保将 UE 重定向回之前注册的 LTE PLMN, 既减少不必要的 PLMN网间切换, 又可以 恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。
并且,进一步从连接释放消息中获取 UE注册的 PLMN ID,即使指定 LTE 频段上有至少两个 LTE PLMN,也可以将 UE重定向回归到 CSFB之前注册的 LTE PLMN中, 进一步保证了 UE回归到 CSFB之前注册的 LTE PLMN的精 准性。 本发明的另一实施例还提供一种 UE, 如图 8所示, 包括: 接收单元 61、 驻留单元 62、 读取单元 63和选择单元 64。
接收单元 61 , 用于接收基站发送的包含长期演进 LTE频段信息的连接释 放消息; 驻留单元 62, 用于驻留到所述接收单元 61接收的所述 LTE频段信息指 定频段上的小区;
读取单元 63 ,用于读取所述驻留单元 62驻留的小区的系统广播信息中包 含的公共陆地移动网络 PLMN标识 ID;
选择单元 64,用于从所述读取单元 63读取到的 PLMN ID中选择所述 UE 预存的 PLMN ID对应的 LTE PLMN,所述 PLMN ID由所述 UE在注册到 LTE PLMN时保存到所述 UE中。
本发明实施例提供的 UE,通过在重定向回归 LTE域网络时,选择预先存 储的注册 PLMN ID, 回归到该 PLMN ID的 LTE PLMN , 与现有技术中在 CS PLMN所支持 LTE频段上随机重选 PLMN相比, UE可以回归到 CSFB之前 注册的 PLMN ID对应的 LTE PLMN,既减少不必要的 PLMN网间切换, 又可 以恢复在之前注册的 LTE PLMN中被挂起的数据业务,提高用户体验。 并且, 仅对 UE侧的重选方式进行改进, 对协议的修改较小, 实现成本较低。 本发明另一实施例还提供一种基站, 如图 9所示, 包括: 接收器 71、 处 理器 72、 发送器 73。
接收器 71 , 用于获知用户设备 UE的电路域回落 CSFB业务结束; 还用 于接收服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所述 UE注册的 长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID;
处理器 72, 用于根据所述接收器接收的 PLMN ID确定 LTE频段信息; 发送器 73, 用于将包含所述处理器 72确定的所述 LTE频段信息的连接 释放消息发送给所述 UE, 以便所述 UE驻留到所述 LTE频段信息所指定频段 上的小区, 并选择所述小区的系统广播信息中包含的 PLMN ID对应的 LTE PLMNo
进一步的, 所述接收器 71具体用于: 接收所述服务 MSC/VLR发送的包 含有 CSFB指示的连接释放消息。
进一步的,在实际应用中由于 UE移动或修改配置等原因,可能切换服务 MSC/VLR。 若所述服务 MSC/VLR是所述 UE注册的 MSC/VLR, 则所述服务 MSC/VLR从所述 UE的注册信息中获取所述 PLMN ID;
若所述服务 MSC/VLR不是所述 UE注册的 MSC/VLR,则所述 PLMN ID 由所述 UE注册的 MSC/VLR发送给所述服务 MSC/VLR。
进一步的,为了保证 LTE频段信息所指定频段上的小区中有至少两个 LTE PLMN可用的情况下, 可以准确回归到 UE之前注册的 LTE PLMN。所述连接 释放消息还包含所述 PLMN ID, 以便所述 UE驻留到所述 LTE频段信息所指 定频段上的小区, 并在所述小区的系统广播信息中包含至少两个 PLMN ID时 选择所述 PLMN ID对应的 LTE PLMN。
本发明实施例提供的基站, 通过获取 UE注册的 PLMN ID, 确定 UE注 册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业务结束后回归到 该指定 LTE频段上的 LTE PLMN, 与现有技术中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比,可以指定 UE CSFB之前所注册的 LTE PLMN 所支持的 LTE频段, 从而确保将 UE重定向回之前注册的 LTE PLMN, 既减 少不必要的 PLMN网间切换, 又可以恢复在之前注册的 LTE PLMN中被挂起 的数据业务, 提高用户体验。
并且, 进一步向 UE发送 UE注册的 PLMN ID, 即使指定 LTE频段上有 至少两个 LTE PLMN, 也可以将 UE重定向回归到 CSFB之前注册的 LTE PLMN中, 进一步保证了 UE回归到 CSFB之前注册的 LTE PLMN的精准性。 本发明另一实施例还提供一种 UE, 如图 10所示, 包括: 接收器 81、 处 理器 82。
接收器 81 , 用于接收基站发送的包含长期演进 LTE频段信息的连接释放 消息;
处理器 82, 用于驻留到所述接收器 81接收到的所述 LTE频段信息所指 定频段上的小区, 选择所述小区的系统广播信息中包含的 PLMN ID对应的 LTE PLMNo
进一步的, 在一种应用场景中, 所述 LTE频段信息指定频段上的小区的 系统广播信息中仅包含一个 PLMN ID;
所述处理器 82, 还用于驻留到所述接收器 81接收的所述 LTE频段信息 指定频段上的小区; 根据驻留的所述小区的系统广播信息, 回归到所述小区 中的 LTE PLMNo
在另一种应用场景中, 所述 LTE频段信息指定频段上的小区的系统广播 信息中包含至少两个 PLMN ID; 为了保证 LTE频段信息所指定频段上的小区 中有至少两个个 PLMN可用的情况下, 可以准确回归到 UE之前注册的 LTE PLMN, 所述连接释放消息还包含 PLMN ID;
所述处理器 82, 还用于驻留到所述接收器 81接收的所述 LTE频段信息 指定频段上的小区; 读取驻留的所述小区的系统广播信息, 所述系统广播信 息中包含至少两个 PLMN ID;从所述至少两个 PLMN ID中选择所述 PLMN ID 对应的 LTE PLMN。
本发明实施例提供的 UE, 通过获取 UE注册的 LTE PLMN支持的 LTE 频段信息, 在 CSFB业务结束后回归到该指定 LTE频段上的 LTE PLMN, 与 现有技术中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以 指定 UE CSFB之前注册的 LTE PLMN所支持的 LTE频段, 从而确保将 UE 重定向回之前注册的 LTE PLMN, 既减少不必要的 PLMN网间切换, 又可以 恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。
并且,进一步从连接释放消息中获取 UE注册的 PLMN ID,即使指定 LTE 频段上有至少两个 LTE PLMN,也可以将 UE重定向回归到 CSFB之前注册的 LTE PLMN中, 进一步保证了 UE回归到 CSFB之前注册的 LTE PLMN的精 准性。 本发明的另一实施例还提供一种 UE, 如图 11所示, 包括: 接收器 91、 处理器 92、 存储器 93。
接收器 91 , 用于接收基站发送的包含长期演进 LTE频段信息的连接释放 消息;
处理器 92, 用于驻留到所述接收器 91接收的所述 LTE频段信息指定频 段上的小区;
存储器 93 ,用于保存所述 UE注册的 LTE网络的公共陆地移动网络 PLMN 标识 ID对应的 LTE PLMN, 所述 PLMN ID由所述 UE在注册到 LTE PLMN 时保存到所述存储器 93中;
所述接收器 91 , 还用于接收驻留到的所述小区的系统广播信息; 所述处理器 92,还用于读取所述接收器 91接收到的所述小区的系统广播 信息中包含的 PLMN ID, 选择所述存储器 93中预存的所述 PLMN ID对应的
LTE PLMNo
本发明实施例提供的 UE, 通过在重定向回归 PS域网络时, 选择预先存 储的注册 PLMN ID, 回归到该 PLMN ID的 LTE PLMN, 与现有技术中在 CS PLMN所支持的 LTE频段上随机重选 PLMN相比, UE可以回归到 CSFB之 前注册的 PLMN ID对应的 LTE PLMN,既减少不必要的 PLMN网间切换,又 可以恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。 并 且, 仅对 UE侧的重选方式进行改进, 对协议的修改较小, 实现成本较低。 本发明的另一实施例还提供一种回归 LTE网络的系统, 如图 12所示, 包 括: 服务 MSC/VLR1001、 基站 1002以及 UE1003;
所述服务 MSC/VLR1001 , 用于在所述 UE1003的电路域回落 CSFB业务 结束后, 向所述基站 1002发送所述 UE1003注册的 LTE公共陆地移动网络 PLMN标识 ID;
所述基站 1002, 用于获知用户设备 UE1003的电路域回落 CSFB业务结 束; 接收服务移动交换中心 /拜访位置寄存器 MSC/VLR1101 发送的所述 UE1103注册的 LTE网络的公共陆地移动网络 PLMN标识 ID; ^据所述 PLMN ID, 确定 LTE频段信息; 将包含所述 LTE频段信息的连接释放消息发送给所 述 UE1103;
所述 UE1003, 用于接收基站 1002发送的包含 LTE频段信息的连接释放 消息; 驻留到所述 LTE频段信息所指定频段上的小区, 选择所述小区的系统 广播信息中包含的公共陆地移动网络 PLMN标识 ID对应的 LTE PLMN。
本发明实施例提供的回归 LTE网络的系统, 通过获取 UE注册的 PLMN ID, 确定 UE注册的 LTE PLMN支持的 LTE频段信息, 使得 UE在 CSFB业 务结束后回归到该指定 LTE频段并指定 PLMN ID的 LTE PLMN,与现有技术 中回归到 CS PLMN所支持的 LTE频段上的 LTE PLMN相比, 可以指定 UE 之前所注册的 LTE PLMN, 既减少不必要的 PLMN网间切换, 又可以恢复在 之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。 本发明另一实施例还提供一种回归 LTE网络的方法, 如图 13所示, 该方 法可以包括:
1101、 UE发起联合注册流程并成功注册到支持 LTE网络的 PLMN1与支 持 CS网络的 PLMN2。
1102、 UE在 PLMN1发起 CSFB, 并成功回落到 PLMN2的 CS网络。 其中, 步骤 1101-1102与图 3所述实施例中的步骤 101-102的实施方式类 似, 在此不再赘述。
1103、 移动管理网元向 UE发送等价 PLMN列表, 所述等价 PLMN列表 中包含所述 UE注册的 PLMN ID1。
其中, 所述移动管理网元可以为 2G/3G网络中的服务 MSC/VLR或服务 GPRS支持节点(英文全称为 Serving GPRS Support Node,英文筒称为 SGSN, 其中 GPRS的中文全称为通用分组无线服务技术, 英文全称为 General Packet Radio Service )。 UE接收到包含所述 UE注册的 PLMN ID1的等价 PLMN列 表后, 将所述等价 PLMN列表保存, 以便后续步骤 1109中使用。
具体的,若 UE发起 CSFB流程后回落到一个新的位置区域( Location Area, LA ),则 UE会发起到服务 MSC/VLR的 CS域位置区域更新 ( Location Area Update, LAU )流程, 在更新请求消息里携带 CSFB指示, 服务 MSC/VLR根 据所携带的 CSFB指示, 在位置更新流程(LAU ) 中下发一个等价 PLMN列 表给 UE, 所述等价 PLMN列表中包括 UE在 CSFB之前注册的 PLMN ID1 , 可选地等价 PLMN列表中可以只包括 UE在 CSFB之前注册的 PLMN ID1。或 者, 若 UE发起 CSFB流程后回落到一个新的路由区域( Routing Area, RA ) , 则 UE会发起到 SGSN的 PS域路由域更新流程,若该路由域更新流程是在 PS 切换流程完成后发起的,则 SGSN可以在 PS切换过程中获知所述路由域更新 流程是在 CSFB过程中发起的, 或者, SGSN在路由域更新流程中, 从 UE所 注册的 MME处获知所述路由域更新流程是在 CSFB过程中发起的, SGSN根 据该 CSFB指示, 下发一个等价 PLMN列表给 UE, 所述等价 PLMN列表中 包括 UE在 CSFB之前注册的 PLMN ID1 ,可选地等价 PLMN列表中可以只包 括 UE在 CSFB之前注册的 PLMN ID1。 或者, 若 UE同时发起了 CS域位置 更新流程与 PS域路由域更新流程, 则服务 MSC/VLR与 SGSN均可以下发相 同的等价 PLMN列表给 UE, 在服务 MSC/VLR与 SGSN下发的等价 PLMN 列表中均包含 UE在 CSFB之前所注册的 PLMN ID1 ,可选地等价 PLMN列表 中可以只包括 UE在 CSFB之前注册的 PLMN ID1。
1104、 UE在 PLMN2进行 CS域业务。
1105、 在 UE的 CS域业务结束后, 服务 MSC/VLR向基站发送 CSFB指 示。
其中, 步骤 1105与图 5所示实施例中的步骤 304的实现方式类似, 所述 CSFB指示用于指示当前 UE的 CS域业务是由于 CSFB引起的, 在所述 CS 域业务结束后, 需要将该 UE重定向回到 LTE网络。
1106、 基站确定 PLMN2对应的 LTE频段 2。
其中, 所确定的 LTE频段信息, 是所述 PLMN ID对应的 PLMN所支持 的 LTE频段信息, 可选地, 所确定的 LTE频段信息也可以是其它 PLMN所支 持的 LTE频段信息。
1107、 基站向 UE发送连接释放消息, 所述连接释放消息中包含 LTE频 段 2信息。
1108、 UE在 LTE频段 2上搜索合适小区并驻留。
其中, 步骤 1106-1108的实现与图 5所示实施例中的步骤 305-307类似, 在此不再赘述。
1109、 UE读取小区的系统广播信息, 从所述系统广播信息包含的 PLMN ID中选择等价 PLMN列表中包含的 PLMN ID1对应的 LTE PLMN1。
其中, UE从小区的系统广播信息中可能读取到至少两个个可用的 PLMN ID,将通过步骤 1103接收并保存的等价 PLMN列表中包含的 PLMN ID1与系 统广播信息中读取到的 PLMN ID 进行匹配。 如果有与 PLMN ID1 匹配的 PLMN ID, 则说明 LTE PLMN1可用, 直接选择 LTE PLMN1。 如果系统广播 信息中读取到的 PLMN ID中没有与 PLMN ID1匹配的 PLMN ID,则说明 LTE PLMN1不可用, UE可以采用传统的 PLMN重选机制选择一个 PLMN或随机 选择一个可用的 PLMN。
可选地, 在执行完本实施例步骤 1105后, 若 UE当前处于 PS域连接态, 所述基站可以发起 PS切换流程将 UE切换回之前注册的 LTE PLMN, 在执行 PS 切换时, 所述基站在选择目标小区时考虑所述 PLMN ID。所述 UE执行基 站所发起的切换流程, 从而回到之前注册的 LTE PLMN。 需要说明的是, 若 基站在步骤 1105后发起了 PS切换流程, 则将不执行步骤 1106到步骤 1108, 在 PS切换流程完成后直接执行步骤 1109。
本发明实施例提供的回归 LTE网络的方法,通过将 UE获取的等价 PLMN 列表配置成仅包含 UE在 CSFB之前所注册的 PLMN ID的列表, 使得 UE根 据等价 PLMN列表回归到 LTE网络时有且仅有一个可供选择的等价 PLMN, 与现有技术中 UE从小区中至少两个个等价 PLMN中选择一个 PLMN的方法 相比,可以确保 UE重定向回之前注册的 LTE PLMN,既减少不必要的 PLMN 网间切换, 又可以恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高 用户体验。 本发明另一实施例还提供一种 UE, 如图 14所示, 包括: 接收单元 1201、 驻留单元 1202、 选择单元 1203。
接收单元 1201 , 在电路域回落 CSFB过程中接收移动管理网元发送的包 含所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID的等 价 PLMN列表; 还用于接收基站发送的包含 LTE频段信息的连接释放消息; 驻留单元 1202, 用于驻留到所述接收单元 1201接收到的 LTE频段信息 所指定频段上的小区;
选择单元 1203,用于从所述驻留单元 1202驻留的小区的系统广播信息包 含的至少一个 PLMN ID中选择所述等价 PLMN列表中包含的 PLMN ID对应 的 LTE PLMN。
本发明实施例提供的 UE,通过将 UE获取的等价 PLMN列表配置成仅包 含 UE在 CSFB之前所注册的 PLMN ID的列表, 使得 UE根据等价 PLMN列 表回归到 LTE网络时有且仅有一个可供选择的等价 PLMN,与现有技术中 UE 从小区中至少两个个等价 PLMN 中选择一个 PLMN 的方法相比, 可以确保 UE重定向回之前注册的 LTE PLMN,既减少不必要的 PLMN网间切换, 又可 以恢复在之前注册的 LTE PLMN中被挂起的数据业务, 提高用户体验。 本发明另一实施例还提供一种 UE, 如图 15所示, 包括: 接收器 1301、 处理器 1302。 接收器 1301 , 用于在电路域回落 CSFB过程中接收移动管理网元发送的 包含所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID 的等价 PLMN列表; 还用于接收基站发送的长期演进 LTE频段信息;
处理器 1302, 用于驻留到所述接收器 1301接收到的 LTE频段信息所指 定频段上的小区;从所述小区的系统广播信息包含的公共陆地移动网络 PLMN 标识 ID中选择等价 PLMN列表中包含的 PLMN ID对应的 LTE PLMN;
所述接收器 1301 , 还用于在所述 UE的 CSFB过程中, 接收由移动管理 网元发送的所述等价 PLMN列表, 所述等价 PLMN列表中只包含所述 UE注 册的 PLMN ID。
本发明实施例提供的 UE, 本发明实施例提供的 UE, 通过将 UE获取的 等价 PLMN列表配置成仅包含 UE在 CSFB之前所注册的 PLMN ID的列表, 使得 UE根据等价 PLMN列表回归到 LTE网络时有且仅有一个可供选择的等 价 PLMN, 与现有技术中 UE从小区中至少两个个等价 PLMN 中选择一个 PLMN的方法相比,可以确保 UE重定向回之前注册的 LTE PLMN,既减少不 必要的 PLMN网间切换, 又可以恢复在之前注册的 LTE PLMN中被挂起的数 据业务, 提高用户体验。
所属领域的技术人员可以清楚地了解到, 为描述的方便和筒洁, 仅以上 述各功能模块的划分进行举例说明, 实际应用中, 可以根据需要而将上述功 能分配由不同的功能模块完成, 即将装置的内部结构划分成不同的功能模块, 以完成以上描述的全部或者部分功能。 上述描述的系统, 装置和单元的具体 工作过程, 可以参考前述方法实施例中的对应过程, 在此不再赘述。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统, 装置和 方法, 可以通过其它的方式实现。 例如, 以上所描述的装置实施例仅仅是示 意性的, 例如, 所述模块或单元的划分, 仅仅为一种逻辑功能划分, 实际实 现时可以有另外的划分方式, 例如多个单元或组件可以结合或者可以集成到 另一个系统, 或一些特征可以忽略, 或不执行。 另一点, 所显示或讨论的相 互之间的耦合或直接耦合或通信连接可以是通过一些接口, 装置或单元的间 接耦合或通信连接, 可以是电性, 机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的, 作 为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可以分布到多个网络单元上。 可以根据实际的需要选择其中的部分或 者全部单元来实现本实施例方案的目的。
另外, 在本申请各个实施例中的各功能单元可以集成在一个处理单元中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在一个单 元中。 上述集成的单元既可以采用硬件的形式实现, 也可以采用软件功能单 元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售 或使用时, 可以存储在一个计算机可读取存储介质中。 基于这样的理解, 本 申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的 全部或部分可以以软件产品的形式体现出来, 该计算机软件产品存储在一个 存储介质中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等)或处理器(processor )执行本申请各个实施例所述 方法的全部或部分步骤。 而前述的存储介质包括: U盘、 移动硬盘、 只读存 储器(ROM, Read-Only Memory ), 随机存取存储器(RAM, Random Access Memory )、 磁碟或者光盘等各种可以存储程序代码的介质。
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 申请可借助软件加必需的通用硬件的方式来实现, 当然也可以通过硬件, 但 很多情况下前者是更佳的实施方式。 基于这样的理解, 本申请的技术方案本 质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来, 该 计算机软件产品存储在可读取的存储介质中, 如计算机的软盘, 硬盘或光盘 等, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等)执行本申请各个实施例所述的方法。
以上所述, 以上实施例仅用以说明本申请的技术方案, 而非对其限制; 尽管参照前述实施例对本申请进行了详细的说明, 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 的本质脱离本申请各实施例技术方案的精神和范围。

Claims

权利要求 书
1、 一种回归长期演进 LTE网络的方法, 其特征在于, 所述方法包括: 基站获知用户设备 UE的电路域回落 CSFB业务结束;
所述基站接收服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所述 UE 注册的 LTE网络的公共陆地移动网络 PLMN标识 ID;
根据所述 PLMN ID, 确定 LTE频段信息;
将包含所述 LTE频段信息的连接释放消息发送给所述 UE。
2、 根据权利要求 1所述的方法, 所述基站获知用户设备 UE的电路域回落 CSFB业务结束, 其特征在于, 包括:
接收所述服务 MSC/VLR发送的包含有 CSFB指示的连接释放消息。
3、 根据权利要求 1或 2所述的方法, 其特征在于,
若所述服务 MSC/VLR是所述 UE注册的 MSC/VLR,则所述服务 MSC/VLR 从所述 UE的注册信息中获取所述 PLMN ID;
若所述服务 MSC/VLR不是所述 UE注册的 MSC/VLR, 则所述 UE注册的 LTE 网络的所述 PLMN ID 由所述 UE 注册的 MSC/VLR 发送给所述服务 MSC/VLR0
4、根据权利要求 1-3中任一项所述的方法,其特征在于,所述包含所述 LTE 频段信息的连接释放消息中还包含所述 PLMN ID。
5、 一种回归长期演进 LTE网络的方法, 其特征在于, 所述方法包括: 用户设备 UE接收基站发送的包含 LTE频段信息的连接释放消息; 驻留到所述 LTE频段信息所指定频段上的小区, 选择所述小区的系统广播 信息中包含的公共陆地移动网络 PLMN标识 ID对应的 LTE PLMN。
6、 根据权利要求 5所述的方法, 其特征在于, 所述连接释放消息中还包含 所述 UE注册的 LTE网络的 PLMN ID; 所述选择所述小区的系统广播信息中包 含的 PLMN ID对应的 LTE PLMN, 包括:
读取所述小区的所述系统广播信息, 所述系统广播信息中包含至少两个 PLMN ID;
从所述至少两个 PLMN ID中选择所述连接释放消息中包含的 PLMN ID对 应的所述 LTE PLMN。
7、 一种回归长期演进 LTE网络的方法, 其特征在于, 所述方法包括: 用户设备 UE接收基站发送的包含 LTE频段信息的连接释放消息; 驻留到所述 LTE频段信息所指定频段上的小区;
读取所述小区的系统广播信息中包含的公共陆地移动网络 PLMN标识 ID; 从所述 PLMN ID中选择所述 UE预存的 PLMN ID对应的 LTE PLMN, 所 述 PLMN ID由所述 UE在注册到 LTE PLMN时保存到所述 UE中。
8、 一种回归长期演进 LTE网络的方法, 其特征在于, 所述方法包括: 在电路域回落 CSFB过程中用户设备 UE接收移动管理网元发送的包含所述 UE注册的 LTE网络的公共陆地移动网络 PLMN标识 ID的等价 PLMN列表; 所述 UE接收基站发送的包含 LTE频段信息的信令释放消息;
驻留到所述 LTE频段信息所指定频段上的小区;
从所述小区的系统广播信息包含的至少一个 PLMN ID 中选择所述等价 PLMN列表中包含的 PLMN ID对应的 LTE PLMN。
9、 一种基站, 其特征在于, 包括:
获知单元, 用于获知用户设备 UE的电路域回落 CSFB业务结束; 接收单元, 用于接收所述获知单元服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN 标识 ID;
确定单元, 用于根据所述接收单元接收的 PLMN ID确定 LTE频段信息; 发送单元, 用于将包含所述确定单元确定的所述 LTE频段信息的连接释放 消息发送给所述 UE。
10、 根据权利要求 9所述的基站, 其特征在于, 所述获知单元具体用于: 接收所述服务 MSC/VLR发送的包含有 CSFB指示的连接释放消息。
11、 根据权利要求 8或 9所述的基站, 其特征在于, 所述包含所述 LTE频 段信息的连接释放消息中还包含所述 PLMN ID。
12、 一种用户设备 UE, 其特征在于, 包括:
接收单元, 用于接收基站发送的包含长期演进 LTE频段信息的连接释放消 息;
回归单元, 用于驻留到所述接收单元接收到的所述 LTE频段信息所指定频 段上的小区, 选择所述小区的系统广播信息中包含的公共陆地移动网络 PLMN 标识 ID对应的 LTE PLMN。
13、 根据权利要求 12所述的 UE, 其特征在于, 所述连接释放消息中还包 含所述 UE注册的 LTE网络的 PLMN ID; 所述回归单元包括:
读取子单元, 用于读取所述小区的所述系统广播信息, 所述系统广播信息 中包含至少两个 PLMN ID;
选择子单元, 用于从所述读取子单元读取到的至少两个 PLMN ID中选择所 述连接释放消息中包含的 PLMN ID对应的所述 LTE PLMN。
14、 一种用户设备 UE, 其特征在于, 包括:
接收单元, 用于接收基站发送的包含长期演进 LTE频段信息的连接释放消 息; 驻留单元, 用于驻留到所述接收单元接收的所述 LTE频段信息指定频段上 的小区;
读取单元, 用于读取所述驻留单元驻留的小区的系统广播信息中包含的公 共陆地移动网络 PLMN标识 ID;
选择单元, 用于从所述读取单元读取到的 PLMN ID中选择所述 UE预存的 PLMN ID对应的 LTE PLMN, 所述 PLMN ID由所述 UE在注册到 LTE PLMN 时保存到所述 UE中。
15、 一种用户设备 UE, 其特征在于, 包括:
接收单元, 用于在电路域回落 CSFB 过程中接收移动管理网元发送的包含 所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID的等价 PLMN列表;
所述接收单元,还用于接收基站发送的包含 LTE频段信息的连接释放消息; 驻留单元, 用于驻留到所述接收单元接收到的 LTE频段信息所指定频段上 的小区;
选择单元, 用于从所述驻留单元驻留的小区的系统广播信息包含的至少一 个 PLMN ID中选择所述等价 PLMN列表中包含的 PLMN ID对应的 LTE PLMN。
16、 一种基站, 其特征在于, 包括:
接收器, 用于获知用户设备 UE的电路域回落 CSFB业务结束; 还用于接收 服务移动交换中心 /拜访位置寄存器 MSC/VLR发送的所述 UE注册的长期演进 LTE网络的公共陆地移动网络 PLMN标识 ID;
处理器, 用于根据所述接收器接收的 PLMN ID确定 LTE频段信息; 发送器, 用于将包含所述处理器确定的所述 LTE频段信息的连接释放消息 发送给所述 UE。
17、 根据权利要求 16所述的基站, 其特征在于, 所述接收器具体用于: 接 收所述服务 MSC/VLR发送的包含有 CSFB指示的连接释放消息。
18、 根据权利要求 16所述基站, 其特征在于, 所述包含所述 LTE频段信息 的连接释放消息中还包含所述 PLMN ID。
19、 一种用户设备 UE, 其特征在于, 包括:
接收器,用于接收基站发送的包含长期演进 LTE频段信息的连接释放消息; 处理器, 用于驻留到所述接收器接收到的所述 LTE频段信息所指定频段上 的小区, 选择所述小区的系统广播信息中包含的公共陆地移动网络 PLMN ID对 应的 LTE PLMNo
20、 根据权利要求 19所述的 UE, 其特征在于, 所述连接释放消息中还包 含所述 UE注册的 LTE网络的 PLMN ID;
所述处理器, 还用于读取驻留的所述小区的所述系统广播信息, 所述系统 广播信息中包含至少两个 PLMN ID;从所述至少两个 PLMN ID中选择所述连接 释放消息中包含的 PLMN ID对应的所述 LTE PLMN。
21、 一种用户设备 UE, 其特征在于, 包括:
接收器,用于接收基站发送的包含长期演进 LTE频段信息的连接释放消息; 处理器, 用于驻留到所述接收器接收的所述 LTE频段信息指定频段上的小 区;
存储器, 用于保存所述 UE注册的 LTE网络的公共陆地移动网络 PLMN标 识 ID, 所述 PLMN ID由所述 UE在注册到 LTE PLMN时保存到所述存储器中; 所述接收器, 还用于接收驻留到的所述小区的系统广播信息;
所述处理器, 还用于读取所述接收器接收到的所述小区的系统广播信息中 包含的 PLMN ID, 选择所述存储器中预存的所述 PLMN ID对应的 LTE PLMNo
22、 一种用户设备 UE, 其特征在于, 包括:
接收器, 用于在电路域回落 CSFB 过程中接收移动管理网元发送的包含所 述 UE注册的长期演进 LTE 网络的公共陆地移动网络 PLMN标识 ID 的等价 PLMN列表;
所述接收器, 还用于接收基站发送的包含 LTE频段信息的连接释放消息; 处理器, 用于驻留到所述接收器接收到的 LTE频段信息所指定频段上的小 区; 从所述小区的系统广播信息包含的至少一个 PLMN ID 中选择所述等价
PLMN列表中包含的 PLMN ID对应的 LTE PLMN。
23、 一种回归长期演进 LTE网络的系统, 其特征在于, 包括: 服务移动交 换中心 /拜访位置寄存器 MSC/VLR、 如权利要求 9、 10、 11、 16、 17或 18所述 的基站以及如权利要求 12、 13、 19或 20所述的用户设备 UE;
所述服务 MSC/VLR, 用于在所述 UE的电路域回落 CSFB业务结束后, 向所 述基站发送所述 UE注册的 LTE公共陆地移动网络 PLMN标识 ID。
PCT/CN2012/084106 2012-11-05 2012-11-05 一种回归长期演进lte网络的方法、设备及系统 WO2014067166A1 (zh)

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