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 PDFInfo
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- 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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- plmn
- lte
- frequency band
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- cell
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- 238000000034 method Methods 0.000 title claims abstract description 124
- 230000007774 longterm Effects 0.000 title claims description 37
- 230000008569 process Effects 0.000 claims abstract description 40
- 230000011664 signaling Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 6
- 102000018059 CS domains Human genes 0.000 description 32
- 108050007176 CS domains Proteins 0.000 description 32
- 238000010586 diagram Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
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- 238000010187 selection method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
- H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/06—Registration at serving network Location Register, VLR or user mobility server
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access 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
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Priority Applications (9)
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CA2890001A CA2890001A1 (en) | 2012-11-05 | 2012-11-05 | Method, device, and system for returning to long term evolution lte network |
CN201280018639.1A CN104025665B (zh) | 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 |
MX2015005634A MX2015005634A (es) | 2012-11-05 | 2012-11-05 | Metodo, dispositivo y sistema para regresar a red de evolución a largo plazo lte. |
EP12887406.2A EP2916593A4 (en) | 2012-11-05 | 2012-11-05 | METHOD, DEVICE AND SYSTEM FOR RETURNING TO AN LTE NETWORK |
BR112015010029A BR112015010029A2 (pt) | 2012-11-05 | 2012-11-05 | método, dispositivo, e sistema para retornar para a rede de evolução a longo prazo lte |
PCT/CN2012/084106 WO2014067166A1 (zh) | 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 |
RU2015121399A RU2015121399A (ru) | 2012-11-05 | 2012-11-05 | Способ, устройство и система для возврата в сеть стандарта долгосрочного развития (lte) |
US14/703,403 US20150237536A1 (en) | 2012-11-05 | 2015-05-04 | Method, device, and system for returning to long term evolution lte network |
ZA2015/03196A ZA201503196B (en) | 2012-11-05 | 2015-05-08 | Method, device and system for regressing to long term evolution (lte) network |
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CN106332188A (zh) * | 2015-06-17 | 2017-01-11 | 中国移动通信集团公司 | 配置eplmn的plmn选择方法、装置和终端 |
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WO2014107855A1 (zh) * | 2013-01-09 | 2014-07-17 | 华为技术有限公司 | 一种选择长期演进lte网络的方法及设备 |
US10028128B2 (en) | 2016-04-29 | 2018-07-17 | Motorola Mobility Llc | Procedures to support network slicing in a wireless communication system |
US10313941B2 (en) * | 2016-06-09 | 2019-06-04 | Apple Inc. | Apparatus, systems and methods for improved mobility between networks |
WO2018084197A1 (ja) * | 2016-11-04 | 2018-05-11 | 京セラ株式会社 | 無線端末及び基地局 |
WO2019080064A1 (zh) * | 2017-10-26 | 2019-05-02 | 深圳市云中飞网络科技有限公司 | 一种用户设备通话检测方法及相关产品 |
CN110267319B (zh) * | 2019-07-17 | 2021-07-20 | 中国联合网络通信集团有限公司 | 基于位置返回lte网络的方法、移动终端及系统 |
WO2024020939A1 (en) * | 2022-07-28 | 2024-02-01 | Apple Inc. | Voice-service provisioning for inter-operator roaming |
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- 2012-11-05 RU RU2015121399A patent/RU2015121399A/ru unknown
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ZA201503196B (en) | 2016-09-28 |
CA2890001A1 (en) | 2014-05-08 |
MX2015005634A (es) | 2016-02-03 |
RU2015121399A (ru) | 2016-12-27 |
BR112015010029A2 (pt) | 2017-07-11 |
CN104025665B (zh) | 2019-02-12 |
CN104025665A (zh) | 2014-09-03 |
EP2916593A4 (en) | 2016-03-16 |
EP2916593A1 (en) | 2015-09-09 |
US20150237536A1 (en) | 2015-08-20 |
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