WO2022001636A1 - 小区选择的方法和装置 - Google Patents

小区选择的方法和装置 Download PDF

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Publication number
WO2022001636A1
WO2022001636A1 PCT/CN2021/099794 CN2021099794W WO2022001636A1 WO 2022001636 A1 WO2022001636 A1 WO 2022001636A1 CN 2021099794 W CN2021099794 W CN 2021099794W WO 2022001636 A1 WO2022001636 A1 WO 2022001636A1
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Prior art keywords
cell
radio access
target
plmn
threshold
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PCT/CN2021/099794
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English (en)
French (fr)
Inventor
孙飞
罗海燕
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP21832439.0A priority Critical patent/EP4156779A4/en
Publication of WO2022001636A1 publication Critical patent/WO2022001636A1/zh
Priority to US18/147,247 priority patent/US20230171685A1/en
Anticipated expiration legal-status Critical
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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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality

Definitions

  • the present application relates to the field of communications, and more particularly, to a method and apparatus for cell selection.
  • 5G provides users with customized network services through end-to-end network slices. Through flexible allocation of network resources and on-demand networking, multiple virtual devices with different characteristics are virtualized on the same set of physical facilities. Logical subnets that are isolated from each other to provide services to users in a targeted manner.
  • the relevant information of the network slice is not referenced for the selection of the Public Land Mobile Network (PLMN) and the selection of the cell, which may cause the terminal equipment to access the wrong cell, and the target network slice is not allowed. , thereby affecting the user experience.
  • PLMN Public Land Mobile Network
  • the present application provides a method and apparatus for cell selection, which can prevent a terminal device from selecting a cell from not allowing its target network to slice, and improve user experience.
  • a method for cell selection including: a first terminal device determining a target network slice; the first terminal device determining a first public land mobile network PLMN according to the target network slice; the first terminal device A first cell is determined according to the first PLMN and the target network slice, and the received signal power of the first cell is greater than a first threshold.
  • the first terminal device determines a target network slice according to the different radio access network devices sent by the first core network device or different cells controlled by the radio access network device respectively support or allow network slicing, and determine the target network slice according to the target network slice.
  • the information determines the first PLMN, and then determines the cell that requests access according to the first PLMN and the target network slice, which can prevent the cell that the first terminal device requests to access from not allowing its target network slice, thereby improving user experience.
  • the determining, by the first terminal device, the target network slice includes: the first terminal device receiving network slice information sent by the first core network device, where the network slice information is included in the first area network slices allowed or supported by different radio access network devices or different cells within the range; the first terminal device determines the target network slice according to the network slice information, and the target network slice belongs to the first area A network slice among network slices allowed by different radio access network devices or different cells within range.
  • the determining, by the first terminal device, the first public land mobile network PLMN according to the target network slice includes: the access stratum AS of the first terminal device detects and receives reception in a full frequency range. A cell whose signal power is greater than or equal to a second threshold; the AS sends the cell identifier and supported PLMN information corresponding to the cell whose received signal power is greater than or equal to the second threshold to the non-access stratum of the first terminal device NAS; the NAS determines, according to the network slicing information, the identity of the radio access network device or cell that allows the target network slicing; the NAS assigns the cell corresponding to the cells whose received signal power is greater than or equal to the second threshold The cell whose identity is the same as the identity of the cell that allows the target network slice is determined as the target cell, or the NAS determines the wireless access point included in the cell identity corresponding to the cell whose received signal power is greater than or equal to the second threshold.
  • the cell with the same identification of the network access device as the identification of the radio access network device that allows the target network slicing is determined as the target cell; the NAS determines the PLMN with the highest priority according to the PLMN information supported by the target cell as the target cell. First PLMN.
  • the determining, by the first terminal device, the first public land mobile network PLMN according to the target network slice includes: a non-access stratum NAS of the first terminal device according to the network slice information Determine the identity of the radio access network device or cell that allows the target network slicing; the NAS sends the radio access network device or cell that allows the target network slicing to the access layer AS of the first terminal device
  • the AS detects the cell whose received signal power is greater than or equal to the second threshold in the whole frequency band; the AS compares the cell identifier corresponding to the cell whose received signal power is greater than or equal to the second threshold with the allowed
  • the cell with the same identifier of the cell of the target network slice is determined as the target cell, or the AS compares the radio access network device identifier included in the cell identifier corresponding to the cell whose received signal power is greater than or equal to the second threshold with the radio access network device identifier.
  • the cell with the same identifier of the radio access network device that allows the target network slicing is determined as the target cell; the AS sends the PLMN information supported by the target cell to the NAS; the NAS according to the PLMN information It is determined that the PLMN with the highest priority is the first PLMN.
  • the determining, by the first terminal device, the first public land mobile network PLMN according to the target network slice includes: the AS of the first terminal device detects, in a full frequency range, that the received signal power is greater than or equal to the second threshold; the AS of the first terminal device sends the cell identifier corresponding to the cell whose received signal power is greater than or equal to the second threshold, the frequency point supported by the cell, and the supported PLMN to the first terminal device
  • the NAS of the terminal device the NAS determines, according to the network slicing information sent by the first core network device, the identifier of the radio access network device that allows the target network slicing and the corresponding frequency point; the NAS determines that the received signal power is greater than or equal to
  • the cell ID corresponding to the cell with the second threshold contains the same radio access network device ID as the ID of the radio access network device that allows the target network slice, and the frequency supported by the cell is the same as the one that allows the target network slice.
  • the determining, by the first terminal device, the first public land mobile network PLMN according to the target network slice includes: the non-access stratum NAS of the first terminal device according to the first core network device
  • the sent network slicing information determines the identifier of the radio access network device that allows the target network slicing and the frequency point supported by the radio access network device;
  • the NAS sends the target network slicing permission to the AS of the first terminal device
  • the AS detects the received signal power point by frequency point according to the frequency point information supported by the radio access network equipment that allows the target network slice A cell greater than or equal to the second threshold;
  • the AS compares the radio access network device identifier included in the corresponding cell identifier in the cell whose received signal power is greater than or equal to the second threshold with the radio access network device that allows the target network slice
  • the cell with the same identity is determined as the target cell;
  • the AS sends
  • the determining, by the first terminal device, the first cell according to the first PLMN and the target network slice includes: the AS detects and receives reception from all cells covered by the first PLMN. A cell whose signal power is greater than or equal to a second threshold; the AS detects a cell whose received signal power is greater than or equal to the first threshold from the cells whose received signal power is greater than or equal to the second threshold; the AS detects a cell whose received signal power is greater than or equal to the first threshold; The cell identifier corresponding to the cell with the first threshold is sent to the NAS; the NAS determines the identifier of the radio access network device or cell that allows the target network slice according to the network slice information; the NAS sends the received signal to the NAS.
  • the cell whose power is greater than the first threshold has the same cell identity as the identity of the cell that allows the target network slice to be determined as the first cell, or the NAS determines that the received signal power is greater than the first
  • a cell whose radio access network device identifier included in the cell identifier corresponding to the threshold value is the same as the identifier of the radio access network device that allows the target network slice is determined as the first cell.
  • the determining, by the first terminal device, the first cell according to the first PLMN and the target network slice includes: the NAS sending, to the AS, the allowing the target network slice The identity of the radio access network equipment or cell; the AS detects that the received signal power is greater than the first PLMN in the cell covered by the first PLMN and the identity of the cell is the same as the identity of the cell that allows the target network slice.
  • a cell with a threshold value, or, in a cell covered by the AS in the first PLMN, the ID of the cell contained in the ID of the radio access network device is the same as the ID of the radio access network device that allows the target network slicing Detecting a cell whose received signal power is greater than the first threshold in the cells; the AS sends the identification of the cell whose received signal power is greater than the first threshold to the NAS; the NAS receives the signal from the cell whose received signal power is greater than the first threshold
  • the first cell is determined among the cells.
  • the determining, by the first terminal device, the first cell according to the first PLMN and the target network slice includes: detecting the AS of the first terminal device in the determined first PLMN A cell whose received signal power is greater than or equal to the second threshold; the AS detects a cell whose received signal power is greater than or equal to the first threshold from among the cells whose received signal power is greater than or equal to the second threshold; the AS determines that the received signal power is greater than the first threshold
  • the cell identifier corresponding to the cell with the threshold value and the frequency point supported by the cell are sent to the NAS of the first terminal device;
  • the identifier of the radio access network device and the corresponding frequency point; the NAS compares the radio access network device identifier included in the cell identifier corresponding to the cell whose received signal power is greater than the first threshold with the radio access network permitting the target network slice A cell with the same identifier of the network equipment and the frequency point supported by the cell and the frequency point corresponding to the radio access network equipment that allows the target network slice
  • the determining, by the first terminal device, the first cell according to the first PLMN and the target network slice includes: sending the NAS of the first terminal device to the NAS of the first terminal device
  • the AS sends the identifier of the radio access network device that allows the target network slicing and the frequency point supported by the radio access network device; the AS according to the frequency point information supported by the radio access network device that allows the target network slicing
  • the cell with the received signal power greater than the first threshold is detected on a frequency-by-frequency point basis;
  • the AS compares the radio access network device identification included in the cell identification corresponding to the cell with the received signal power greater than the first threshold with the allowable target
  • the cell with the same identifier of the radio access network equipment of the network slice is determined as the target cell; the identifier of the target cell is sent to the NAS; the NAS determines the first cell from the target cells whose received signal power is greater than the first threshold.
  • the first area range is the area range of at least one tracking area TA or the area range of at least one registration area RA.
  • a second aspect provides a method for cell selection, including: a first core network device sending network slice information to a first terminal device, where the network slice information includes different radio access network devices or different cells within a first area Network slices allowed or supported respectively.
  • the method further includes: the first core network device receives the information sent by the radio access network device.
  • the first core network device receives the information sent by the radio access network device.
  • the first area range is the area range of at least one tracking area TA or the area range of at least one registration area RA.
  • a method for cell selection including: a first terminal device sending detection failure indication information to a radio access network device, where the detection failure indication information includes a target network slice selected by the first terminal device identification information, used to indicate that the target network slice is not supported by the network;
  • the radio access network device receives the detection failure indication information
  • the radio access network device performs redirection, handover or dual-connection operations on the first terminal device.
  • a method for cell selection including: a first terminal device sending detection failure indication information to a first core network device, where the detection failure indication information includes a target network slice selected by the first terminal device. Identification information, used to indicate that the target network slice is not supported by the network.
  • the first core network device receives the detection failure indication information
  • the first core network device performs redirection, handover or dual-connection operations on the first terminal device.
  • a communication device comprising: a processing unit configured to determine a target network slice; the processing unit is further configured to determine a first public land mobile network PLMN according to the target network slice; the processing unit The method is further used for determining a first cell according to the first PLMN and the target network slice, where the received signal power of the first cell is greater than a first threshold.
  • the apparatus further includes: a transceiver unit, configured to receive network slicing information sent by the first core network device, where the network slicing information includes different radio access network devices within the first area or network slices allowed or supported by different cells respectively; the processing unit is specifically configured to determine the target network slice according to the network slice information, and the target network slice belongs to the different wireless accesses within the first area.
  • a transceiver unit configured to receive network slicing information sent by the first core network device, where the network slicing information includes different radio access network devices within the first area or network slices allowed or supported by different cells respectively
  • the processing unit is specifically configured to determine the target network slice according to the network slice information, and the target network slice belongs to the different wireless accesses within the first area.
  • the processing unit is specifically configured to: detect a cell whose received signal power is greater than or equal to a second threshold in the entire frequency band; determine that the cell whose received signal power is greater than or equal to the second threshold corresponds to The cell identity and the supported PLMN information; determine the identity of the radio access network device or cell that allows the target network slice according to the network slice information; A cell whose cell identifier is the same as the identifier of the cell that allows the target network slice is determined as the target cell, or, the radio access network included in the cell identifier corresponding to the cell whose received signal power is greater than or equal to the second threshold A cell whose device identity is the same as that of the radio access network device that allows the target network slicing is determined as the target cell; and the PLMN with the highest priority is determined according to the PLMN information supported by the target cell as the first PLMN.
  • the processing unit is specifically configured to: determine, according to the network slicing information, an identifier of a radio access network device or cell that allows the target network slicing; detect the received signal power in the full frequency range A cell greater than or equal to a second threshold; determining a cell with the same cell identity as the identity of the cell that allows the target network slice among the cells with the received signal power greater than or equal to the second threshold as the target cell, or , determine the cell whose radio access network device ID included in the cell ID corresponding to the cell whose received signal power is greater than or equal to the second threshold is the same as the ID of the radio access network device that allows the target network slicing is determined as target cell; determine the PLMN information supported by the target cell; determine the PLMN with the highest priority according to the PLMN information as the first PLMN.
  • the processing unit is specifically configured to: detect a cell whose received signal power is greater than or equal to a second threshold from all cells covered by the first PLMN; Detecting cells whose received signal power is greater than the first threshold in the cells with the second threshold; determining the cell identifier corresponding to the cell whose received signal power is greater than the first threshold; The identification of the network access device or cell; the cell with the same identification of the cell whose received signal power is greater than the first threshold is the same as the identification of the cell that allows the target network slice is determined as the first cell, or , determine the cell whose radio access network device ID included in the cell ID corresponding to the cell whose received signal power is greater than the first threshold is the same as the ID of the radio access network device that allows the target network slicing first district.
  • the processing unit is specifically configured to: determine, according to the network slice information, an identifier of a radio access network device or a cell that allows the target network slice; in a cell covered by the first PLMN Detect a cell whose received signal power is greater than the first threshold in a cell whose identity is the same as the identity of the cell that allows the target network slice, or, in the cell covered by the first PLMN, the identity of the cell contains wireless Detecting a cell whose received signal power is greater than a first threshold from the cell whose identity of the access network device is the same as the identity of the radio access network device that allows the target network slice; and from the cell whose received signal power is greater than the first threshold The first cell is determined.
  • the first area range is the area range of at least one tracking area TA or the area range of at least one registration area RA.
  • a communication apparatus comprising: a transceiver unit configured to send network slice information to a first terminal device, where the network slice information includes different radio access network devices or different cells within a first area, respectively Allowed or supported network slices.
  • the transceiver unit before the sending the network slice information to the first terminal device, is further configured to: receive a network slice or a network slice supported by the wireless access network device and sent by the wireless access network device. Network slices respectively supported by different cells controlled by the radio access network device, where the radio access network device is a network device within the scope of the first area.
  • the first area range is the area range of at least one tracking area TA or the area range of at least one registration area RA.
  • a communication device comprising: a processor and a transceiver, the transceiver is configured to receive computer code or instructions and transmit them to the processor, and the processor executes the computer code or instructions, A method as in the first aspect or any possible implementation manner of the first aspect.
  • a communication device comprising: a processor and a transceiver, the transceiver is configured to receive computer code or instructions and transmit them to the processor, and the processor executes the computer code or instructions, A method as in the second aspect or any possible implementation of the second aspect.
  • a computer-readable storage medium stores a computer program; when the computer program runs on a computer, the computer can execute the first aspect or any possible implementation manner of the first aspect. method in .
  • a computer-readable storage medium where a computer program is stored in the computer-readable medium; when the computer program runs on a computer, the computer can execute the second aspect or any possible implementation manner of the second aspect. method in .
  • FIG. 1 is a schematic diagram of interaction of a flow of a UE accessing an error RAN node for registration according to an embodiment of the present application.
  • FIG. 2 is a flowchart interaction diagram of a method for cell selection according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of network slicing allowed under the granularity of a radio access network device according to an embodiment of the present application.
  • FIG. 4 is a flowchart interaction diagram of another method for cell selection according to an embodiment of the present application.
  • FIG. 5 is a flowchart interaction diagram of another method for cell selection according to an embodiment of the present application.
  • FIG. 6 is a schematic block diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 7 is a schematic block diagram of another communication apparatus according to an embodiment of the present application.
  • FIG. 8 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • the embodiments of the present application can be applied to various communication systems, such as a wireless local area network system (Wireless Local Area Network, WLAN), a narrowband Internet of Things system (Narrow Band-Internet of Things, NB-IoT), a global system for mobile communications, enhanced data Rate GSM Evolution System (Enhanced Data rate for GSM Evolution, EDGE), Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA), Code Division Multiple Access 2000 System (Code Division Multiple Access, CDMA2000), Time Division Synchronous Code Division Multiple access system (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), Long Term Evolution (LTE), satellite communication, fifth generation (5th generation, 5G) system or new communication system that will appear in the future Wait.
  • WLAN Wireless Local Area Network
  • NB-IoT narrowband Internet of Things
  • EDGE enhanced data Rate GSM Evolution System
  • WCDMA Wideband Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000 System
  • Time Division Synchronous Code Division Multiple access system Time Division-
  • the terminal devices involved in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem.
  • the terminal can be a mobile station (mobile station, MS), a subscriber unit (subscriber unit), user equipment (user equipment, UE), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a personal digital assistant ( personal digital assistant, PDA) computer, tablet computer, wireless modem (modem), handheld device (handset), laptop computer (laptop computer), machine type communication (machine type communication, MTC) terminal, etc.
  • 5G provides users with customized network services through end-to-end network slices. Through flexible allocation of network resources and on-demand networking, multiple virtual devices with different characteristics are virtualized on the same set of physical facilities. Logical subnets that are isolated from each other to provide services to users in a targeted manner.
  • S-NSSAI single network slice selection assistance information
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable and low-latency communications
  • the UE When the UE selects a radio access network (RAN) node to perform the registration process, it may not be able to know which network slices the current RAN node supports. There may be a situation where the RAN node selected by the UE does not support the network slice requested by the UE, that is, the target network Slices are not allowed by the network, thus causing the UE to access the wrong RAN node for registration, which in turn affects the subsequent service initiation of the UE and reduces the service experience of the UE. As shown in FIG. 1 , a schematic diagram of the process interaction of the UE accessing the wrong RAN node for registration is shown. The specific process is as follows:
  • the S-NSSAI supported by the RAN node 1 is S-NSSAI#1, and the RAN node 1 reports the S-NSSAI#1 supported by the RAN node 1 to the access and mobility management function (access and mobility management function, AMF);
  • AMF access and mobility management function
  • the AMF stores the S-NSSAI#1 supported by the RAN node 1;
  • the S-NSSAI supported by the RAN node 2 is S-NSSAI#2, and the RAN node 2 reports the S-NSSAI#2 supported by it to the AMF;
  • the AMF stores the S-NSSAI#2 supported by the RAN node 2;
  • the UE initiates a registration request to the AMF through the RAN node 1, and the registration request message carries the target network slice requested by the UE as S-NSSAI#2;
  • RAN node 1 forwards the registration request of the UE to the AMF;
  • AMF rejects S-NSSAI#2 because S-NSSAI#2 is not supported by RAN node 1;
  • the AMF sends the allowed NSSAI and the rejected S-NSSAI#2 to the RAN node 1;
  • RAN node 1 replies with a registration acceptance message to the UE, and forwards the allowed NSSAI, rejected S-NSSAI#2 message sent by the AMF to the UE.
  • the wrong RAN node is accessed and registered, thereby affecting the subsequent service initiation of the UE.
  • the relevant information of the network slice is not referenced for the selection of the public land mobile network PLMN and the selection of the cell, which may cause the UE to access the wrong cell, and the target network slice of which is not allowed. Therefore, it is very important for the UE to obtain the network slice information allowed by the current network.
  • the PLMN selection process includes two cases, one is the case without prior information, and the other is the case with prior information.
  • the selection process of PLMN without prior information and with prior information is different.
  • the prior information is the PLMN information pre-stored by the UE, that is, several designated PLMNs.
  • the non-access stratum (NAS) of the UE instructs the access stratum (access stratum, AS) of the UE to detect a given PLMN, and determine whether there is a PLMN that can reside there. If there is no cell, the next PLMN is detected.
  • NAS non-access stratum
  • AS access stratum
  • the PLMN selection process without prior information includes:
  • Step 1 Power on the UE
  • Step 2 The UE determines that there is no PLMN prior information in the Universal Mobile Telecommunication System (USIM) card, that is, there is no storage information of the PLMN used last time;
  • USIM Universal Mobile Telecommunication System
  • Step 3 The AS of the UE automatically detects a cell that meets certain conditions within the full frequency range or according to the instructions of the non-access stratum NAS, that is, a cell with strong signal strength, for example, the primary common control physical channel (primary common control physical channel, PCCPCH) received signal power (received signal code power, RSCP), or reference signal received power (reference signal received power, RSRP) is greater than or equal to -84dBm cells; the above RSCP and RSRP are collectively referred to as received signal power.
  • the primary common control physical channel primary common control physical channel
  • PCCPCH primary common control physical channel
  • RSCP received signal code power
  • RSRP reference signal received power
  • Step 4 AS reads the identity of the PLMN supported by the cell with the stronger signal strength
  • Step 5 The AS reports the identity of the PLMN supported by the cell with stronger signal strength to the non-access stratum (NAS);
  • NAS non-access stratum
  • Step 6 The NAS determines the PLMN from the multiple PLMNs supported by the cell with strong signal strength. It should be understood that after the NAS determines the PLMN, it can also send stop indication information to the AS, so that the AS stops the detection.
  • the PLMN selection process includes:
  • Step 1 Power on the UE
  • Step 2 The UE determines that there is PLMN prior information in the USIM card, that is, there is the storage information of the PLMN used last time;
  • Step 3 The NAS of the UE instructs the AS to detect a cell that meets certain conditions according to the prior information, that is, a cell with strong signal strength, for example, a cell with a PCCPCH RSCP or RSRP greater than or equal to -84dBm;
  • Step 4 If the AS detects a cell that conforms to the first verification information and has strong signal strength, the AS reads the identity of the PLMN supported by the cell;
  • Step 5 AS reports to the NAS the identity of the PLMN supported by the cell that meets the first verification information and has strong signal strength;
  • Step 6 The NAS determines a PLMN from a plurality of PLMNs supported by a cell that conforms to the first verification information and has strong signal strength. It should be understood that after the NAS determines the PLMN, it can also send stop indication information to the AS, so that the AS stops the detection.
  • the NAS instructs the AS to perform cell selection in the cells covered by the PLMN according to the selected PLMN.
  • the cell selection process is also divided into two cases, one is the case without prior information, and the other is the case with prior information.
  • the prior information is pre-stored cell parameter information, such as carrier frequency information, previously received measurement control information, or previously detected cell parameter information.
  • the NAS instructs the AS to detect cells that meet certain conditions according to the cell parameters.
  • the UE needs to detect cells that meet certain conditions within the full frequency range.
  • the network slice information that the UE can obtain is in the granularity of tracking area (TA) or registration area (RA), and one RA can contain several TAs, that is, the obtained information is within the scope of one TA or RA.
  • the set of network slices allowed by all radio access network devices.
  • the embodiment of the present application proposes a method 200 for cell selection, which can avoid that the cell selected by the terminal device does not allow its target network slice, thereby improving user experience.
  • FIG. 2 a flow interaction diagram of a method 200 for cell selection according to an embodiment of the present application is shown.
  • the radio access network device sends, to the first core network device, network slices supported by the radio access network device or network slices respectively supported by different cells controlled by the radio access network device.
  • the radio access network device is a network device within the first area, that is, the radio access network device may be a network device within the area of at least one TA, or may be a network device within the area of at least one RA.
  • Network slice information may be a base station or other wireless access network device; the first core network device may be an AMF or other core network device.
  • the radio access network device sends the network slice it supports, it means that different cells controlled by the radio access network device support the network slice. For example, if the cell controlled by the radio access network equipment includes cell 1, cell 2 and cell 3, and the network slice supported by the radio access network equipment is S-NSSAI#1, then cell 1, cell 2 and cell 3 all support the network slice S-NSSAI#1. NSSAI #1. If the radio access network device sends the network slices supported by different cells it controls, the network slices supported by each cell may be different, and each cell has its own network slices.
  • what the radio access network device sends to the first core network device may be network slices supported by the radio access network device or network slices supported respectively by different cells controlled by the radio access network device.
  • the first core network device receives a network slice supported by the radio access network device or a network slice supported by different cells controlled by the radio access network device and sent by the radio access network device.
  • the first core network device sends network slice information to the first terminal device, where the network slice information includes network slices respectively allowed or supported by different radio access network devices or different cells within the first area.
  • the network slice information may be sent to the first terminal device when the first core network device replies to the registration request after the first terminal device initiates the registration request, or may be carried in other data packets.
  • the allowed network slice information is used to indicate a network slice that the first terminal device can use within the current first area.
  • the supported network slice information is used to indicate network slices respectively supported by different radio access network devices or different cells within the current first area. It should be understood that the network slice allowed by a cell refers to the intersection of the network slice supported by the cell and the network slice subscribed by the terminal device.
  • the first core network device sends to the first terminal device is network slices that are respectively supported by different radio access network devices or different cells within the first area
  • the first core network device also sends the first terminal device The set of network slices allowed by all radio access network devices or cells within the first area.
  • the first core network device provides smaller granularity of allowed network slice information based on radio access network devices or cells.
  • the network slice information sent by the first core network device to the first terminal device is a network slice allowed by different base stations within the scope of the first TA area.
  • FIG. 3 a schematic diagram of network slicing allowed under the granularity of a radio access network device according to an embodiment of the present application is shown.
  • the network slice set NSSAI supported in the first TA range is: S-NSSAI #1, #2, #3, #4, #5, #6, #7, where the network allows the network slices used by the first terminal device S-NSSAI #1, #2, #3, #4;
  • the NSSAI supported by base station 1 is S-NSSAI #2, #3, #6, #7
  • the NSSAI supported by base station 2 is S-NSSAI #1, #2, #3, #5, the network slices allowed by base station 1 are #2, #3; the network slices allowed by base station 2 are S-NSSAI #1, #2, #3. That is, the network slice allowed by the radio access network device is the intersection of the network slice allowed in the first TA range and the network slice supported by the radio access network device.
  • the network slice information sent by the first core network device to the first terminal device may be network slice information allowed by different radio access network devices within the first area, or may be different wireless access network slice information within the first area.
  • Network slice information supported by the access network device When the first core network device sends a network slice supported by the radio access network device in the first area, the first terminal device may determine, according to the network slice information allowed in the first area, that the radio access network device allows network slice.
  • the network slice information sent by the first core network device to the first terminal device may be a network slice allowed by different cells within the first area, or may be a network slice supported by different cells within the first area.
  • the first terminal device may determine the network slice allowed by the cell according to the network slice information allowed in the first area.
  • the network slice information sent by the first core network device to the first terminal device may include priority information of allowed or supported network slices.
  • the first terminal device receives the network slice information sent by the first core network device.
  • the first terminal device determines a target network slice according to the network slice information sent by the first core network device.
  • the target network slice is determined from network slices allowed by different radio access network devices or different cells within the first area, in other words, the target network slice belongs to different radio access network devices or different network slices within the first area The network slice within the network slices allowed by the cell.
  • the target network slice may be determined by the first terminal device according to priority information that allows network slices provided by the first core network device.
  • the first terminal device may determine the network slice with the highest priority as The target network slice.
  • the target network slice may be determined by the first terminal device itself according to the historical use of the network slice.
  • the target network slice may also be a network slice to be initiated by the first terminal device at present. This embodiment of the present application does not limit this.
  • the first terminal device determines the first PLMN according to the target network slice.
  • the first PLMN is the PLMN that the first terminal device requests to access.
  • the first terminal device uses the network slice information allowed by different radio access network devices or different cells as prior information, and performs PLMN selection.
  • Specific implementations can include:
  • Step 1 The AS of the first terminal device detects cells whose received signal power is greater than or equal to the second threshold in the full frequency range.
  • the second preset condition may be that the PCCPCH RSCP or RSRP is greater than or equal to -84dBm, in other words, the first terminal device
  • the AS detects cells with strong signal strength in the full frequency range;
  • Step 2 the AS of the first terminal device sends the cell identifier corresponding to the cell whose received signal power is greater than or equal to the second threshold and the supported PLMN to the NAS of the first terminal device;
  • Step 3 The NAS determines the identity of the radio access network device or the identity of the cell that allows the target network slicing according to the network slicing information sent by the first core network device; if the network slicing information sent by the first core network device only includes the first Network slicing allowed by different radio access network devices in the area, the NAS can only determine the identifier of the radio access network device that allows the target network slice; if the network slice information sent by the first core network device includes the first area range network slices allowed by different cells in the target network slice, the NAS can determine the identity of the cell that allows the target network slice.
  • Step 4 The NAS determines the cell with the same cell identifier corresponding to the cell whose received signal power is greater than or equal to the second threshold and the cell with the same identifier of the cell allowing the target network slice as the target cell;
  • the NAS may assign the corresponding cells to the cells whose received signal power is greater than or equal to the second threshold.
  • the cell identity that includes the radio access network device identity that is the same as the identity of the radio access network device that allows the target network slicing is determined as the target cell.
  • the length of the cell identifier is longer than the length of the identifier of the radio access network device, and the identifier of the radio access network device controlling the cell can be determined by the first few digits of the cell identifier. It should be understood that there may be one or more target cells.
  • Step 5 The NAS determines the PLMN with the highest priority as the first PLMN according to the PLMN information supported by the selected target cell; a target cell may support multiple PLMNs, and the supported PLMNs have a priority order. If there are multiple target cells, the PLMN with the highest priority among the multiple PLMNs supported by the multiple target cells may be determined as the first PLMN. Optionally, the NAS may also determine the first PLMN according to the historical usage, and the first PLMN may not have the highest priority among the multiple PLMNs supported by the target cell.
  • the NAS can further screen the PLMNs supported by the target cell, select the PLMNs that allow the network slicing, and then determine the PLMN with the highest priority from the screened PLMNs as the first PLMN.
  • Step 1 The non-access stratum NAS of the first terminal device determines, according to the network slicing information sent by the first core network device, the identity of the radio access network device or the identity of the cell that allows the target network slicing. If the network slice information sent by the first core network device only includes network slices allowed by different radio access network devices within the first area, the NAS can only determine the identifier of the radio access network device that allows the target network slice; if If the network slice information sent by the first core network device includes network slices allowed by different cells in the first area, the NAS may determine the identity of the cell that allows the target network slice.
  • Step 2 the NAS sends the identifier of the radio access network device or the identifier of the cell that allows the target network slicing to the AS;
  • Step 3 The AS of the first terminal device detects cells whose received signal power is greater than or equal to the second threshold within the full frequency range, where the second threshold may be -84dBm or other values; in other words, the first terminal device's AS detects cells with strong signal strength in the full frequency range;
  • Step 4 The AS determines a cell whose received signal power is greater than or equal to the second threshold and has the same cell identity as the identity of the cell that allows the target network slice as the target cell. For example, if the cells whose received signal power is greater than or equal to the second threshold include cell 1, cell 2, cell 3 and cell 4, and within the scope of the first area, the allowed cells of the target network slice include cell 2, cell 4 and cell 6, then Cell 2 and Cell 4 may be determined as target cells.
  • the AS may assign the corresponding cells to the cells whose received signal power is greater than or equal to the second threshold.
  • the cell identity that contains the radio access network device identity that is the same as the identity of the radio access network device that allows the target network slicing is determined as the target cell.
  • Step 5 The AS sends the PLMN information supported by the target cell to the NAS, where the PLMN information may be PLMN information supported by one target cell, or may be a set of PLMN information supported by multiple target cells.
  • Step 6 The NAS determines the PLMN with the highest priority as the first PLMN according to the PLMN information supported by the target cell.
  • the NAS may also determine the first PLMN from multiple PLMNs according to historical usage.
  • the network slices allowed by the same radio access network device or the same cell under different PLMNs may be different.
  • the PLMNs supported by the target cell reported by the AS may be all PLMNs supported by the target cell. Therefore, in step 6, the NAS can further screen the PLMNs supported by the target cell reported by the AS, and select the PLMNs that allow the network slicing , and then determine the PLMN with the highest priority from the filtered PLMNs as the first PLMN.
  • the first terminal device determines the first cell according to the first PLMN and the target network slice.
  • the first cell is the cell to which the first terminal device finally determines to request access.
  • the first terminal device uses network slice information allowed by different radio access network devices or different cells as prior information, and performs cell selection.
  • Specific implementations can include:
  • Step 1 The AS of the first terminal device detects a cell whose received signal power is greater than or equal to a second threshold in the determined first PLMN, that is, detects a cell with strong signal strength, and the second threshold may be -84dBm.
  • Step 2 The AS detects a cell whose received signal power is greater than the first threshold from among cells whose received signal power is greater than or equal to the second threshold.
  • a cell whose received signal power is greater than the first threshold is a cell that satisfies the S criterion.
  • the S criterion is:
  • Qrxlevmeas is the reference signal received power RSRP of the candidate cell
  • Qrxlevmin and Qrxlevminoffset are the minimum reception levels of the cell configured in the system information block (SIB), only when the UE camps on the visited cell
  • SIB system information block
  • Qrxlevminoffset is only used when visiting Public Land Mobile Network (VPLMN) cells
  • Pcompensation is the maximum value between the difference between the maximum available transmit power PEMAX of the UE minus the UE maximum RF output power PUMAX and 0 , namely MAX(PEMAX-PUMAX, 0).
  • Step 3 the AS sends the cell identifier corresponding to the above-mentioned received signal power greater than the first threshold to the NAS of the first terminal device;
  • Step 4 The NAS determines the identity of the radio access network device or the identity of the cell that allows the target network slicing according to the network slicing information sent by the first core network device; if the network slicing information sent by the first core network device only includes the first Network slicing allowed by different radio access network devices in the area, the NAS can only determine the identifier of the radio access network device that allows the target network slice; if the network slice information sent by the first core network device includes the first area range network slices allowed by different cells in the target network slice, the NAS can determine the identity of the cell that allows the target network slice.
  • Step 5 The NAS determines the cell with the same cell identifier in the cell whose received signal power is greater than the first threshold and the cell with the same identifier as the cell that allows the target network slice as the first cell;
  • the NAS may assign cells corresponding to cells whose received signal power is greater than the first threshold.
  • the cell whose identity includes the identity of the radio access network device and the identity of the radio access network device that allows the target network slicing is determined to be the first cell;
  • the number of the first cells may be one or multiple, and when the number of the first cells is multiple, the first terminal device may access any one of the cells.
  • Step 1 the NAS of the first terminal device sends the identity of the radio access network device or the identity of the cell that allows the target network slicing to the AS of the first terminal device;
  • Step 2 The AS detects a cell whose received signal power is greater than the first threshold in a cell covered by the first PLMN whose identity is the same as the identity of the cell that allows the target network slice; or, the AS is in a cell covered by the first PLMN.
  • the ID of the medium cell includes the ID of the radio access network device that is the same as the ID of the radio access network device that allows the target network slicing to detect the cell whose received signal power is greater than the first threshold, wherein the received signal power is greater than the first threshold
  • the cell is the cell that satisfies the S criterion.
  • Step 3 the AS sends the identity of the cell whose received signal power is greater than the first threshold to the NAS;
  • Step 4 The NAS determines the first cell from the cells whose received signal power is greater than the first threshold.
  • the first terminal device determines a target network slice according to the different radio access network devices sent by the first core network device or different cells controlled by the radio access network device respectively support or allow network slicing, and determine the target network slice according to the target network slice.
  • the information determines the first PLMN, and then determines the cell that requests access according to the first PLMN and the target network slice, which can prevent the cell that the first terminal device requests to access from not allowing its target network slice, thereby improving user experience.
  • the first terminal device may send the information to the radio access network device or the first core network device. If the detection fails, the radio access network device or the first core network device then performs redirection, handover or dual-connection operations on the first terminal device, so that the first terminal device can access a cell that allows its target network slice.
  • the radio access network device may be a radio access network device that allows slicing of the target network, or may be other radio access network devices.
  • FIG. 4 a flow interaction diagram of another method 400 for cell selection according to an embodiment of the present application is shown. The specific process includes:
  • the first terminal device sends detection failure indication information to the wireless access network device.
  • the detection failure indication information may include identification information of the target network slice selected by the first terminal device, which is used to indicate the target network. Slicing is not supported by the network;
  • the wireless access network device receives the detection failure indication information
  • the radio access network device performs redirection, handover or dual connection operation to the first terminal device.
  • FIG. 5 an interactive flowchart of another cell selection method 500 according to an embodiment of the present application is shown.
  • the specific process includes:
  • the first terminal device sends detection failure indication information to the first core network device.
  • the detection failure indication information may include identification information of the target network slice selected by the first terminal device, which is used to indicate the target network. Slicing is not supported by the network; it should be understood that the first terminal device may also send failure indication information to other core network devices.
  • the first core network device receives the detection failure indication information
  • the first core network device may perform redirection, handover, or dual-connection operations on the first terminal device, and the first core network device may also instruct the radio access network device currently accessed by the UE to perform operations on the first terminal device. Redirect, switch or dual connection.
  • the wireless access network device may send frequency point information supported by the wireless access network device and network slices supported by different frequency points to the first core network device; it should be understood that the wireless access network device Frequency information supported by different cells controlled by the radio access network device and network slices supported by different cells under different frequencies may also be sent to the first core network device.
  • the network slice information sent by the first core network device to the first terminal device may include frequency point information supported by different radio access network devices within the first area and network slices respectively allowed or supported by different frequency points.
  • the specific implementation manner may further include:
  • Step 1 The AS of the first terminal device detects cells whose received signal power is greater than or equal to the second threshold in the full frequency range, and the second threshold may be -84dBm. In other words, the AS of the first terminal device detects the signal in the full frequency range. Strong community;
  • Step 2 the AS of the first terminal device sends the cell identifier corresponding to the cell whose received signal power is greater than or equal to the second threshold, the frequency point supported by the cell, and the supported PLMN to the NAS of the first terminal device;
  • Step 3 The NAS determines, according to the network slicing information sent by the first core network device, the identifier of the radio access network device that allows the target network slicing and the corresponding frequency point;
  • Step 4 The NAS compares the radio access network device ID included in the cell ID corresponding to the cell with the received signal power greater than or equal to the second threshold to the ID of the radio access network device that allows the target network slice, and the cell supports the ID of the radio access network device.
  • the cell with the same frequency as the frequency corresponding to the radio access network device that allows the target network slice is determined as the target cell.
  • Step 5 The NAS determines the PLMN with the highest priority as the first PLMN according to the PLMN information supported by the selected target cell; a target cell may support multiple PLMNs, and the supported PLMNs have a priority order. If there are multiple target cells, the PLMN with the highest priority among the multiple PLMNs supported by the multiple target cells may be determined as the first PLMN. Optionally, the NAS may also determine the first PLMN according to the historical usage, and the first PLMN may not have the highest priority among the multiple PLMNs supported by the target cell.
  • the NAS can further screen the PLMNs supported by the target cell, select the PLMNs that allow the network slicing, and then determine the PLMN with the highest priority from the screened PLMNs as the first PLMN.
  • the specific implementation manner may further include:
  • Step 1 the non-access stratum NAS of the first terminal device determines, according to the network slicing information sent by the first core network device, the identifier of the radio access network device that allows the target network slicing and the frequency point supported by the radio access network device;
  • Step 2 The NAS sends to the AS of the first terminal device the identifier of the radio access network device that allows the target network slicing and the frequency point information supported by the radio access network device;
  • Step 3 The AS detects the cells whose received signal power is greater than or equal to the second threshold value by frequency point according to the frequency point information supported by the radio access network equipment that allows the target network slice, where the second threshold value may be -84dBm; this embodiment It can prevent the AS from detecting cells whose received signal power is greater than or equal to the second threshold in the full frequency range, and only needs to detect that the received signal power is greater than or equal to the second threshold on the frequency point supported by the radio access network equipment that allows the target network slice 's district.
  • Step 4 The AS determines the cell with the same radio access network device ID included in the cell ID corresponding to the cell whose received signal power is greater than or equal to the second threshold and the ID of the radio access network device that allows the target network slice as the target cell .
  • Step 5 The AS sends the PLMN information supported by the target cell to the NAS, where the PLMN information may be PLMN information supported by one target cell, or may be a set of PLMN information supported by multiple target cells.
  • Step 6 The NAS determines the PLMN with the highest priority as the first PLMN according to the PLMN information supported by the target cell.
  • the NAS may also determine the first PLMN from multiple PLMNs according to historical usage.
  • the network slices allowed by the same radio access network device or the same cell under different PLMNs may be different.
  • the PLMNs supported by the target cell reported by the AS may be all PLMNs supported by the target cell. Therefore, in step 6, the NAS can further screen the PLMNs supported by the target cell reported by the AS, and select the PLMNs that allow the network slicing , and then determine the PLMN with the highest priority from the filtered PLMNs as the first PLMN.
  • the specific implementation manner may further include:
  • Step 1 The AS of the first terminal device detects a cell with a received signal power greater than or equal to a second threshold in the determined first PLMN, that is, detects a cell with strong signal strength, and the second threshold may be -84dBm;
  • Step 2 AS detects a cell whose received signal power is greater than or equal to the second threshold from the cells whose received signal power is greater than or equal to the second threshold; the cell whose received signal power is greater than the first threshold is a cell that satisfies the S criterion;
  • Step 3 the AS sends the cell identifier corresponding to the cell whose received signal power is greater than the first threshold and the frequency point supported by the cell to the NAS of the first terminal device;
  • Step 4 The NAS determines, according to the network slicing information sent by the first core network device, the identifier of the radio access network device that allows the target network slicing and the corresponding frequency point;
  • Step 5 The NAS sets the radio access network device ID included in the cell ID corresponding to the cell whose received signal power is greater than the first threshold is the same as the ID of the radio access network device that allows the target network slicing, and the cell supports the frequency point
  • the cell with the same frequency point corresponding to the radio access network device that allows the target network slice is determined as the first cell; wherein, the number of the first cells may be one, or there may be multiple, when the number of the first cells is more At times, the first terminal device can access any one of the cells.
  • the specific implementation manner may further include:
  • Step 1 the NAS of the first terminal device sends, to the AS of the first terminal device, the identifier of the radio access network device that allows target network slicing and the frequency point supported by the radio access network device;
  • Step 2 AS detects the cells whose received signal power is greater than the first threshold in the cells covered by the first PLMN point by frequency according to the frequency point information supported by the radio access network equipment that allows the target network slice;
  • Step 3 the AS determines the cell with the same radio access network device ID included in the cell ID corresponding to the cell ID whose received signal power is greater than the first threshold and the ID of the radio access network device allowing the target network slice as the target cell; and sending the identity of the target cell to the NAS;
  • Step 4 The NAS determines the first cell from the target cells whose received signal power is greater than the first threshold.
  • the same cell may support one or more frequencies, and the network slices allowed by the cell under different frequencies are different.
  • the NAS can determine the frequency allowed for the target network slice according to the information about the network slices allowed under different frequencies supported by the target cell. point is the dwell frequency point.
  • the first terminal device may send the information to the radio access network device or the first core network device. If the detection fails, the radio access network device or the first core network device then performs redirection, handover or dual-connection operations on the first terminal device, so that the first terminal device can access a cell that allows its target network slice.
  • FIG. 6 is a schematic block diagram of a communication apparatus 600 according to an embodiment of the present application.
  • the communication device 600 includes:
  • a processing unit 610 configured to determine a target network slice
  • the processing unit 610 is further configured to determine a first public land mobile network PLMN according to the target network slice;
  • the processing unit 610 is further configured to determine a first cell according to the first PLMN and the target network slice, where the received signal power of the first cell is greater than a first threshold.
  • the apparatus further includes: a transceiver unit 620, configured to receive network slice information sent by the first core network device, where the network slice information includes different radio access network devices or different cells within the first area. allowed or supported network slices;
  • the processing unit 610 is specifically configured to determine the target network slice according to the network slice information, where the target network slice belongs to the network slices allowed by different radio access network devices or different cells within the first area. network slice.
  • processing unit 610 is specifically configured to:
  • the PLMN with the highest priority is determined as the first PLMN.
  • processing unit 610 is specifically configured to:
  • processing unit 610 is specifically configured to:
  • processing unit 610 is specifically configured to:
  • the first cell is determined from the cells having the received signal power greater than a first threshold.
  • the first area range is the area range of at least one tracking area TA or the area range of at least one registration area RA.
  • FIG. 7 shows a schematic block diagram of another communication apparatus 700 according to an embodiment of the present application.
  • the communication device 700 includes:
  • the transceiver unit 710 is configured to send network slice information to the first terminal device, where the network slice information includes network slices respectively allowed or supported by different radio access network devices or different cells within the first area.
  • the transceiver unit 710 is further configured to: receive a network slice or the wireless access network supported by the wireless access network device and sent by the wireless access network device network slices supported by different cells controlled by a network device, where the radio access network device is a network device within the first area.
  • the first area range is the area range of at least one tracking area TA or the area range of at least one registration area RA.
  • FIG. 8 shows a schematic block diagram of a communication device 800 according to an embodiment of the present application.
  • the communication device 800 includes:
  • a processor 810 and a transceiver 820 the transceiver 820 is configured to receive computer codes or instructions and transmit them to the processor, and the processor 810 executes the computer codes or instructions to implement the method.
  • the above-mentioned processor 820 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA), or other possible solutions. Programming logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • Programming logic devices, discrete gate or transistor logic devices, discrete hardware components The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed.
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art.
  • the storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.
  • the memory described above may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory.
  • the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM), which acts as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous DRAM
  • SDRAM double data rate synchronous dynamic random access memory
  • double data rate SDRAM double data rate SDRAM
  • DDR SDRAM enhanced synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SCRAM synchronous link dynamic random access memory
  • direct rambus RAM direct rambus RAM
  • the above-mentioned memory may be integrated in the processor, or the above-mentioned processor and the memory may also be integrated on the same chip, or may be respectively located on different chips and connected by means of interface coupling. This embodiment of the present application does not limit this.
  • the embodiments of the present application further provide a computer-readable storage medium, on which a computer program for implementing the methods in the foregoing method embodiments is stored.
  • a computer program for implementing the methods in the foregoing method embodiments is stored.
  • the computer program runs on a computer, the computer can implement the methods in the above method embodiments.
  • the term "and/or” in this application is only an association relationship to describe associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time. , there are three cases of B alone.
  • the character "/" in this document generally indicates that the contextual object is an "or” relationship; the term “at least one” in this application can mean “one” and "two or more", for example, A At least one of , B, and C can mean: A alone exists, B exists alone, C exists alone, A and B exist simultaneously, A and C exist simultaneously, C and B exist simultaneously, and A and B and C exist simultaneously. seven situations.
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and 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 purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
  • the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

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Abstract

本申请提供了一种小区选择的方法和装置，能够提高用户体验，该方法包括：第一终端设备确定目标网络切片；所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN；所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，所述第一小区的接收信号功率大于第一阈值。

Description

小区选择的方法和装置
本申请要求于2020年06月30日提交中国国家知识产权局、申请号为202010614739.7、申请名称为“小区选择的方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体地，涉及一种小区选择的方法和装置。
背景技术
随着信息技术发展，对各类新业务以及应用场景不断涌现，这些业务对网络功能、连接性能及安全性等方面的需求存在很大的差别。如果利用单一网络去承载这些业务，将很难同时满足高带宽、低时延、高可靠性等需求。另外，为每种业务去单独新建网络又会带来巨大的成本。这就要求5G在具备灵活、可拓展性的同时，能够满足不同的业务需求。为此，5G通过端对端的网络切片(network slice)为用户提供定制化的网络服务，通过对网络资源的灵活分配、按需组网，在同一套物理设施上虚拟出多个具有不同特点且相互隔离的逻辑子网，来针对性地为用户提供服务。
在现有协议中，关于公共陆地移动网络(Public Land Mobile Network，PLMN)选择、小区选择都未参考网络切片的相关信息，这样可能导致终端设备接入错误的小区，其目标网络切片不被允许，从而影响用户的体验。
发明内容
本申请提供了一种小区选择的方法和装置，能够避免终端设备选择小区不允许其目标网络切片，提高用户体验。
第一方面，提供一种小区选择的方法，包括：第一终端设备确定目标网络切片；所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN；所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，所述第一小区的接收信号功率大于第一阈值。
基于上述技术方案，第一终端设备根据第一核心网设备发送的不同无线接入网设备或该无线接入网设备控制的不同小区分别支持或允许网络切片确定目标网络切片，根据该目标网络切片信息确定第一PLMN，再根据该第一PLMN和目标网络切片确定请求接入的小区，可以避免第一终端设备请求接入的小区不允许其目标网络切片，从而提高用户体验。
在一种可能的实现方式中，所述第一终端设备确定目标网络切片，包括：所述第一终端设备接收第一核心网设备发送的网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片；所述第一终端设备根据所述网络切片信息确定所述目标网络切片，所述目标网络切片属于所述在第一区域范围内不 同无线接入网设备或不同小区允许的网络切片中的网络切片。
在一种可能的实现方式中，所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN，包括：所述第一终端设备的接入层AS在全频段范围内检测接收信号功率大于或等于第二阈值的小区；所述AS将所述接收信号功率大于或等于第二阈值的小区对应的小区标识以及支持的PLMN信息发送至所述第一终端设备的非接入层NAS；所述NAS根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；所述NAS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，所述NAS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；所述NAS根据所述目标小区支持的PLMN信息确定优先级最高的PLMN为所述第一PLMN。
在一种可能的实现方式中，所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN，包括：所述第一终端设备的非接入层NAS根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；所述NAS向所述第一终端设备的接入层AS发送所述允许所述目标网络切片的无线接入网设备或小区的标识；所述AS在全频段范围内检测接收信号功率大于或等于第二阈值的小区；所述AS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，所述AS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；所述AS将所述目标小区支持的PLMN信息发送至所述NAS；所述NAS根据所述PLMN信息确定优先级最高的PLMN为所述第一PLMN。
在一种可能的实现方式中，所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN，包括：所述第一终端设备的AS在全频范围内检测接收信号功率大于或等于第二阈值的小区；所述第一终端设备的AS将接收信号功率大于或等于第二阈值的小区对应的小区标识、所述小区支持的频点以及支持的PLMN发送至所述第一终端设备的NAS；所述NAS根据第一核心网设备发送的网络切片信息确定允许所述目标网络切片的无线接入网设备的标识以及对应的频点；所述NAS将接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同、且所述小区支持的频点与允许所述目标网络切片的无线接入网设备对应的频点相同的小区确定为目标小区；所述NAS根据所述目标小区支持的PLMN信息确定优先级最高的PLMN为第一PLMN。
在一种可能的实现方式中，所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN，包括：所述第一终端设备的非接入层NAS根据第一核心网设备发送的网络切片信息确定允许所述目标网络切片的无线接入网设备的标识以及所述无线接入网设备支持的频点；所述NAS向第一终端设备的AS发送允许所述目标网络切片的无线接入网设备的标识以及所述无线接入网设备支持的频点信息；所述AS根据允许所述目标网络切片的无线接入网设备支持的频点信息逐频点检测接收信号功率大于或等于第二阈值的小区；所述AS将接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无 线接入网设备标识与允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；所述AS将所述目标小区支持的PLMN信息发送至所述NAS，所述NAS根据所述目标小区支持的PLMN信息确定优先级最高的PLMN为第一PLMN。
在一种可能的实现方式中，所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，包括：所述AS从所述第一PLMN覆盖的所有小区中检测接收信号功率大于或等于第二阈值的小区；所述AS从所述接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区；所述AS将所述接收信号功率大于第一阈值的小区对应的小区标识发送至所述NAS；所述NAS根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；所述NAS将所述接收信号功率大于第一阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为所述第一小区，或，所述NAS将所述接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为所述第一小区。
在一种可能的实现方式中，所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，包括：所述NAS向所述AS发送所述允许所述目标网络切片的无线接入网设备或小区的标识；所述AS在所述第一PLMN覆盖的小区中小区的标识与所述允许所述目标网络切片的小区的标识相同的小区中检测接收信号功率大于第一阈值的小区，或，所述AS在所述第一PLMN覆盖的小区中小区的标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区中检测接收信号功率大于第一阈值的小区；所述AS将所述接收信号功率大于第一阈值的小区的标识发送至所述NAS；所述NAS从所述接收信号功率大于第一阈值的小区中确定所述第一小区。
在一种可能的实现方式中，所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，包括：所述第一终端设备的AS在确定的第一PLMN中检测接收信号功率大于或等于第二阈值的小区；所述AS从接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区；所述AS将上述接收信号功率大于第一阈值的小区对应的小区标识以及所述小区支持的频点发送至所述第一终端设备的NAS；所述NAS根据所述第一核心网设备发送的网络切片信息确定允许所述目标网络切片的无线接入网设备的标识以及对应的频点；所述NAS将接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与允许所述目标网络切片的无线接入网设备的标识相同、且所述小区支持的频点与允许该目标网络切片的无线接入网设备对应的频点相同的小区确定为第一小区。
在一种可能的实现方式中，所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，包括：所述第一终端设备的NAS向所述第一终端设备的AS发送允许目标网络切片的无线接入网设备的标识以及所述无线接入网设备支持的频点；所述AS根据允许所述目标网络切片的无线接入网设备支持的频点信息在第一PLMN覆盖的小区中逐频点检测接收信号功率大于第一阈值的小区；所述AS将接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；并将所述目标小区的标识发送至NAS；所述NAS从接收信号功率大于第一阈值的目标小区中确定第一小区。
在一种可能的实现方式中，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
第二方面，提供一种小区选择的方法，包括：第一核心网设备向第一终端设备发送网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片。
在一种可能的实现方式中，所述第一核心网设备向第一终端设备发送网络切片信息之前，所述方法还包括：所述第一核心网设备接收无线接入网设备发送的所述无线接入网设备支持的网络切片或所述无线接入网设备控制的不同小区分别支持的网络切片，所述无线接入网设备为所述第一区域范围内的网络设备。
在一种可能的实现方式中，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
第三方面，提供一种小区选择的方法，包括：第一终端设备向无线接入网设备发送检测失败指示信息，所述检测失败指示信息中包括所述第一终端设备选择的目标网络切片的标识信息，用于指示所述目标网络切片不被网络支持；
在一种可能的实现方式中，所述无线接入网设备接收所述检测失败指示信息；
在一种可能的实现方式中，所述无线接入网设备对所述第一终端设备执行重定向、切换或双联接操作。
第四方面，提供一种小区选择的方法，包括：第一终端设备向第一核心网设备发送检测失败指示信息，所述检测失败指示信息中包括所述第一终端设备选择的目标网络切片的标识信息，用于指示所述目标网络切片不被网络支持。
在一种可能的实现方式中，所述第一核心网设备接收所述检测失败指示信息；
在一种可能的实现方式中，所述第一核心网设备对所述第一终端设备执行重定向、切换或双联接操作。
第五方面，提供了一种通信装置，包括：处理单元，用于确定目标网络切片；所述处理单元还用于，根据所述目标网络切片确定第一公共陆地移动网PLMN；所述处理单元还用于，根据所述第一PLMN和所述目标网络切片确定第一小区，所述第一小区的接收信号功率大于第一阈值。
在一种可能的实现方式中，所述装置还包括：收发单元，用于接收第一核心网设备发送的网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片；所述处理单元具体用于，根据所述网络切片信息确定所述目标网络切片，所述目标网络切片属于所述在第一区域范围内不同无线接入网设备或不同小区允许的网络切片中的网络切片。
在一种可能的实现方式中，所述处理单元具体用于：在全频段范围内检测接收信号功率大于或等于第二阈值的小区；确定所述接收信号功率大于或等于第二阈值的小区对应的小区标识以及支持的PLMN信息；根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区； 根据所述目标小区支持的PLMN信息确定优先级最高的PLMN为所述第一PLMN。
在一种可能的实现方式中，所述处理单元具体用于：根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；在全频段范围内检测接收信号功率大于或等于第二阈值的小区；将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；确定所述目标小区支持的PLMN信息；根据所述PLMN信息确定优先级最高的PLMN为所述第一PLMN。
在一种可能的实现方式中，所述处理单元具体用于：从所述第一PLMN覆盖的所有小区中检测接收信号功率大于或等于第二阈值的小区；从所述接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区；确定所述接收信号功率大于第一阈值的小区对应的小区标识；根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；将所述接收信号功率大于第一阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为所述第一小区，或，将所述接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为所述第一小区。
在一种可能的实现方式中，所述处理单元具体用于：根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；在所述第一PLMN覆盖的小区中小区的标识与所述允许所述目标网络切片的小区的标识相同的小区中检测接收信号功率大于第一阈值的小区，或，在所述第一PLMN覆盖的小区中小区的标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区中检测接收信号功率大于第一阈值的小区；从所述接收信号功率大于第一阈值的小区中确定所述第一小区。
在一种可能的实现方式中，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
第六方面，提供了一种通信装置，包括：收发单元，用于向第一终端设备发送网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片。
在一种可能的实现方式中，所述向第一终端设备发送网络切片信息之前，所述收发单元还用于：接收无线接入网设备发送的所述无线接入网设备支持的网络切片或所述无线接入网设备控制的不同小区分别支持的网络切片，所述无线接入网设备为所述第一区域范围内的网络设备。
在一种可能的实现方式中，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
第七方面，提供了一种通信设备，包括：处理器和收发器，所述收发器用于接收计算机代码或指令，并传输至所述处理器，所述处理器运行所述计算机代码或指令，如第一方面或第一方面任意可能的实现方式中的方法。
第八方面，提供了一种通信设备，包括：处理器和收发器，所述收发器用于接收计算 机代码或指令，并传输至所述处理器，所述处理器运行所述计算机代码或指令，如第二方面或第二方面任意可能的实现方式中的方法。
第九方面，提供了一种计算机可读存储介质，所述计算机可读介质存储有计算机程序；所述计算机程序在计算机上运行时，使得计算机执行第一方面或第一方面任意可能的实现方式中的方法。
第十方面，提供了一种计算机可读存储介质，所述计算机可读介质存储有计算机程序；所述计算机程序在计算机上运行时，使得计算机执行第二方面或第二方面任意可能的实现方式中的方法。
附图说明
图1为本申请实施例的UE接入错误RAN节点进行注册的流程交互示意图。
图2为本申请实施例的一种小区选择的方法的流程交互图。
图3为本申请实施例的无线接入网设备粒度下允许的网络切片示意图。
图4为本申请实施例的另一种小区选择的方法的流程交互图。
图5为本申请实施例的另一种小区选择的方法的流程交互图。
图6为本申请实施例的一种通信装置的示意性框图。
图7为本申请实施例的另一种通信装置的示意性框图。
图8为本申请实施例的一种通信设备的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例可以应用于各种通信系统，例如无线局域网系统(Wireless Local Area Network，WLAN)、窄带物联网系统(Narrow Band-Internet of Things，NB-IoT)、全球移动通信系统、增强型数据速率GSM演进系统(Enhanced Data rate for GSM Evolution，EDGE)、宽带码分多址系统(Wideband Code Division Multiple Access，WCDMA)、码分多址2000系统(Code Division Multiple Access，CDMA2000)、时分同步码分多址系统(Time Division-Synchronization Code Division Multiple Access，TD-SCDMA)，长期演进系统(Long Term Evolution，LTE)、卫星通信、第五代(5th generation，5G)系统或者将来出现的新的通信系统等。
本申请实施例中所涉及到的终端设备可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备。终端可以是移动台(mobile station，MS)、用户单元(subscriber unit)、用户设备(user equipment,UE)、蜂窝电话(cellular phone)、智能电话(smart phone)、无线数据卡、个人数字助理(personal digital assistant，PDA)电脑、平板型电脑、无线调制解调器(modem)、手持设备(handset)、膝上型电脑(laptop computer)、机器类型通信(machine type communication，MTC)终端等。
随着移动通信技术的发展，各类新业务以及应用场景不断涌现，这些业务对网络功能、连接性能及安全性等方面的需求存在很大的差别。如果利用单一网络去承载这些业务，将很难同时满足高带宽、低时延、高可靠性等需求。另外，为每种业务去单独新建网络又会 带来巨大的成本。这就要求5G在具备灵活、可拓展性的同时，能够满足不同的业务需求。为此，5G通过端对端的网络切片(network slice)为用户提供定制化的网络服务，通过对网络资源的灵活分配、按需组网，在同一套物理设施上虚拟出多个具有不同特点且相互隔离的逻辑子网，来针对性地为用户提供服务。
不同逻辑子网由单网络切片选择支撑信息(single network slice selection assistance information，S-NSSAI)来标识和区分，NSSAI是S-NSSAI的集合。不同载波频率(小区)支持不同的网络切片，例如，2.6GHz支持增强型移动宽带(enhanced mobile broadband，eMBB)业务，4.9GHz支持高可靠低时延通信(ultra reliable and low latency communications，URLLC)业务。
UE选择无线接入网(radio access network，RAN)节点执行注册流程时可能无法获知当前RAN节点支持哪些网络切片，可能存在UE选择的RAN节点不支持该UE请求的网络切片的情况，即目标网络切片不被网络允许，从而导致UE接入错误的RAN节点进行注册，进而影响UE的后续业务发起，降低了UE的服务体验。如图1所示，出示了UE接入错误RAN节点进行注册的流程交互示意图。具体过程如下：
110，RAN节点1支持的S-NSSAI为S-NSSAI#1，RAN节点1将其支持的S-NSSAI#1上报给接入和移动性管理功能(access and mobility management function，AMF)；
120，AMF存储RAN节点1支持的S-NSSAI#1；
130，RAN节点2支持的S-NSSAI为S-NSSAI#2，RAN节点2将其支持的S-NSSAI#2上报给AMF；
140，AMF存储RAN节点2支持的S-NSSAI#2；
150，UE通过RAN节点1向AMF发起注册请求，注册请求消息中携带该UE请求的目标网络切片为S-NSSAI#2；
160，RAN节点1将UE的注册请求转发至AMF；
170，AMF拒绝S-NSSAI#2，因为S-NSSAI#2不被RAN节点1支持；
180，AMF向RAN节点1发送允许的NSSAI，以及拒绝的S-NSSAI#2；
190，RAN节点1向UE回复注册接受消息，并将AMF发送的允许的NSSAI，拒绝S-NSSAI#2消息转发至UE。
上述过程中，UE选择的RAN节点1不支持S-NSSAI#2，其目标网络切片S-NSSAI#2不被网络允许，则接入错误的RAN节点注册，进而影响UE的后续业务发起。
在现有协议中，关于公共陆地移动网络PLMN选择、小区选择都未参考网络切片的相关信息，这样可能导致UE接入错误的小区，其目标网络切片不被允许。因此，UE获取当前网络允许的网络切片信息至关重要。
为了便于对本申请实施例的理解，对现有技术中的PLMN选择、小区选择过程进行简单描述。PLMN选择过程包括两种情况，一种是无先验信息的情况，另一种是有先验信息的情况，无先验信息和有先验信息的PLMN选择过程不同。应理解，现有技术中该先验信息是UE预先存储的PLMN信息，即指定的若干PLMN。有先验信息时，UE的非接入层(non-access stratum，NAS)指示UE的接入层(access stratum，AS)去检测给定的PLMN，并判断该PLMN下是否有能够驻留的小区，没有的话则检测下一个PLMN。
1)无先验信息情况下PLMN选择过程包括：
步骤一：UE开机；
步骤二：UE确定通用无线通信系统(Universal Mobile Telecommunication System，USIM)卡中无PLMN先验信息，即没有上次使用的PLMN的保存信息；
步骤三：UE的AS自动在全频范围内或者按照非接入层NAS的指示检测满足一定条件的小区，即信号强度较强的小区，例如，主公共控制物理信道(primary common control physical channel，PCCPCH)接收信号功率(received signal code power，RSCP)，或参考信号接收功率(reference signal received power，RSRP)大于或等于-84dBm的小区；上述RSCP和RSRP统称为接收信号功率。
步骤四：AS读取上述信号强度较强的小区支持的PLMN的标识；
步骤五：AS将信号强度较强的小区支持的PLMN的标识上报至非接入层(non-access stratum，NAS)；
步骤六：NAS从信号强度较强的小区支持的多个PLMN中确定PLMN。应理解，NAS确定完PLMN后还可以发送停止指示信息给AS，使AS停止检测。
2)有先验信息情况下PLMN选择过程包括：
步骤一：UE开机；
步骤二：UE确定USIM卡中有PLMN先验信息，即存在上次使用的PLMN的保存信息；
步骤三：UE的NAS按照先验信息指示AS检测满足一定条件的小区，即信号强度较强的小区，例如，PCCPCH RSCP或RSRP大于或等于-84dBm的小区；
步骤四：若AS检测到符合先验证信息的且信号强度较强的小区，AS读取该小区支持的PLMN的标识；
步骤五：AS将符合先验证信息的且信号强度较强的小区支持的PLMN的标识上报至NAS；
步骤六：NAS从符合先验证信息的且信号强度较强的小区支持的多个PLMN中确定PLMN。应理解，NAS确定完PLMN后还可以发送停止指示信息给AS，使AS停止检测。
PLMN选择结束后，NAS根据选择的PLMN，指示AS在该PLMN覆盖的小区中进行小区选择。小区选择过程也分为两种情况，一种是无先验信息的情况，另一种是有先验信息的情况。现有技术中该先验信息是预先存储的小区参数信息，例如载波频率信息、先前接收到的测量控制信息或先前检测到的小区的参数信息。有先验信息时，NAS指示AS按照小区参数检测满足一定条件的小区。无先验信息时，UE需要全频范围内检测满足一定条件的小区。
目前，UE能够获取到的网络切片信息都是跟踪区域(tracking area，TA)或者注册区域(registration area，RA)粒度的，其中一个RA可以包含若干TA，即获得的是一个TA或RA范围内所有无线接入网设备允许的网络切片的集合。
本申请实施例提出了一种小区选择的方法200，可以避免终端设备选择的小区不允许其目标网络切片，从而提高用户体验。
如图2所示，出示了本申请实施例的一种小区选择的方法200的流程交互图。
210，无线接入网设备向第一核心网设备发送该无线接入网设备支持的网络切片或者该无线接入网设备控制的不同小区分别支持的网络切片。该无线接入网设备为第一区域范 围内的网络设备，即该无线接入网设备可以为至少一个TA的区域范围内的网络设备，也可以为至少一个RA的区域范围内的网络设备。第一区域范围内的无线接入网设备可以为一个或多个，则可能有多个无线接入网设备向该第一核心网设备发送其支持的网络切片或者其控制的不同小区分别支持的网络切片信息。其中，无线接入网设备可能为基站或其他无线接入网设备；第一核心网设备可以为AMF，也可以为其他核心网设备。
若无线接入网设备发送的是其支持的网络切片，则表示该无线接入网设备控制的不同小区都支持该网络切片。例如：无线接入网设备控制小区包括小区1、小区2和小区3，无线接入网设备支持的网络切片为S-NSSAI#1，则小区1、小区2和小区3都支持网络切片S-NSSAI#1。若无线接入网设备发送的是其控制的不同小区分别支持的网络切片，则每个小区支持的网络切片可能不同，每个小区都有其支持的网络切片。
可选的，无线接入网设备向第一核心网设备发送的可以是该无线接入网设备支持的网络切片或者该无线接入网设备控制的不同小区分别支持的网络切片。
220，第一核心网设备接收无线接入网设备发送的该无线接入网设备支持的网络切片或该无线接入网设备控制的不同小区分别支持的网络切片。
230，第一核心网设备向第一终端设备发送网络切片信息，该网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片。该网络切片信息可以是第一终端设备发起注册请求之后，该第一核心网设备回复该注册请求时发送给第一终端设备的，也可以是承载在其他数据包中的。允许的网络切片信息用于指示第一终端设备在当前第一区域范围内可以使用的网络切片。支持的网络切片信息用于指示在当前第一区域范围内不同无线接入网设备或不同小区分别支持的网络切片。应理解，小区允许的网络切片是指该小区支持的网络切片与终端设备订阅过的网络切片的交集。若第一核心网设备向第一终端设备发送的是在第一区域范围内不同无线接入网设备或不同小区分别支持的网络切片，则第一核心网设备还向第一终端设备发送了在第一区域范围内所有无线接入网设备或小区允许的网络切片的集合。
基于本申请实施例的技术方案，第一核心网设备给出了基于无线接入网设备或小区的更小粒度的允许的网络切片信息。
以第一核心网设备向第一终端设备发送的网络切片信息是在第一TA区域范围内不同基站允许的网络切片为例。如图3所示，出示了本申请实施例的无线接入网设备粒度下允许的网络切片示意图。假设在第一TA范围内支持的网络切片集合NSSAI为：S-NSSAI#1、#2、#3、#4、#5、#6、#7，其中网络允许第一终端设备使用的网络切片为S-NSSAI#1、#2、#3、#4；假设基站1支持的NSSAI为S-NSSAI#2、#3、#6、#7，基站2支持的NSSAI为S-NSSAI#1、#2、#3、#5，则基站1允许的网络切片为#2、#3；基站2允许的网络切片为S-NSSAI#1、#2、#3。即，无线接入网设备允许的网络切片为在第一TA范围内允许的网络切片与该无线接入网设备支持的网络切片的交集。
可选的，第一核心网设备向第一终端设备发送的网络切片信息可以是在第一区域范围内不同无线接入网设备允许的网络切片信息，也可以是在第一区域范围内不同无线接入网设备支持的网络切片信息。当第一核心网设备发送的是在第一区域范围内无线接入网设备支持的网络切片时，第一终端设备可以根据第一区域范围内允许的网络切片信息确定该无线接入网设备允许的网络切片。同理，第一核心网设备向第一终端设备发送的网络切片信 息可以是在第一区域范围内不同小区允许的网络切片，也可以是在第一区域范围内不同小区支持的网络切片。当第一核心网设备发送的是在第一区域范围内小区支持的网络切片时，第一终端设备可以根据第一区域范围内允许的网络切片信息确定该小区允许的网络切片。
可选的，第一核心网设备向第一终端设备发送网络切片信息中可以包括允许或支持的网络切片的优先级信息。
240，第一终端设备接收第一核心网设备发送的网络切片信息。
250，第一终端设备根据第一核心网设备发送的网络切片信息确定目标网络切片。该目标网络切片是从第一区域范围内不同无线接入网设备或不同小区分别允许的网络切片中确定的，换言之，该目标网络切片属于在第一区域范围内不同无线接入网设备或不同小区允许的网络切片中的网络切片。
可选的，该目标网络切片可以是该第一终端设备根据第一核心网设备提供的允许网络切片的优先级信息确定的，例如，该第一终端设备可以将优先级最高的网络切片确定为目标网络切片。可选的，该目标网络切片可以是该第一终端设备根据历史使用网络切片的情况自行确定的。可选的，该目标网络切片也可以是该第一终端设备目前要发起的网络切片。本申请实施例对此不做限定。
260，第一终端设备根据目标网络切片确定第一PLMN。该第一PLMN为该第一终端设备请求接入的PLMN。
第一终端设备将不同无线接入网设备或不同小区允许的网络切片信息作为先验信息，进行PLMN选择。具体的实现方式可以包括：
实现方式一：
步骤一：第一终端设备的AS在全频范围内检测接收信号功率大于或等于第二阈值的小区，第二预设条件可以为PCCPCH RSCP或RSRP大于或等于-84dBm，换言之，第一终端设备的AS在全频范围内检测信号强度较强的小区；
步骤二：第一终端设备的AS将接收信号功率大于或等于第二阈值的小区对应的小区标识以及支持的PLMN发送至所述第一终端设备的NAS；
步骤三：NAS根据第一核心网设备发送的网络切片信息确定允许该目标网络切片的无线接入网设备的标识或小区的标识；若第一核心网设备发送的网络切片信息中只包括第一区域范围内不同无线接入网设备允许的网络切片，则NAS只能确定允许该目标网络切片的无线接入网设备的标识；若第一核心网设备发送的网络切片信息中包括第一区域范围内不同小区允许的网络切片，则NAS可以确定允许该目标网络切片的小区的标识。
步骤四：NAS将接收信号功率大于或等于第二阈值的小区对应的小区标识与允许该目标网络切片的小区的标识相同的小区确定为目标小区；
可选的，若第一核心网设备发送的网络切片信息中只包括第一区域范围内不同无线接入网设备允许的网络切片，NAS可以将接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区。具体而言，小区标识的长度较无线接入网设备的标识的长度要长，通过小区标识的前几位可以确定出控制该小区的无线接入网设备的标识。应理解，目标小区可能为一个或多个。
步骤五：NAS根据选定的目标小区支持的PLMN信息确定优先级最高的PLMN为第一PLMN；一个目标小区可能支持多个PLMN，且支持的PLMN具有优先级顺序。若目标小区为多个，可以将多个目标小区分别支持的多个PLMN中优先级最高的PLMN确定为第一PLMN。可选的，NAS也可以根据历史使用情况确定第一PLMN，该第一PLMN可能不是目标小区支持的多个PLMN中优先级最高的。
应理解，同一无线接入网设备或者同一小区在不同PLMN下允许的网络切片可能存在差异。因此在步骤五中，NAS可以对目标小区支持的PLMN做进一步的筛选，筛选出的允许该网络切片的PLMN，再从筛选出的PLMN中确定优先级最高的PLMN为第一PLMN。
实现方式二：
步骤一：第一终端设备的非接入层NAS根据第一核心网设备发送的网络切片信息确定允许该目标网络切片的无线接入网设备的标识或小区的标识。若第一核心网设备发送的网络切片信息中只包括第一区域范围内不同无线接入网设备允许的网络切片，则NAS只能确定允许该目标网络切片的无线接入网设备的标识；若第一核心网设备发送的网络切片信息中包括第一区域范围内不同小区允许的网络切片，则NAS可以确定允许该目标网络切片的小区的标识。
步骤二：NAS向AS发送允许该目标网络切片的无线接入网设备的标识或小区的标识；
步骤三：第一终端设备的AS在全频范围内检测接收信号功率大于或等于第二阈值的小区，其中，第二阈值可以为-84dBm，也可以是其他数值；换言之，第一终端设备的AS在全频范围内检测信号强度较强的小区；
步骤四：AS将接收信号功率大于或等于第二阈值的小区中对应的小区标识与允许该目标网络切片的小区的标识相同的小区确定为目标小区。例如，接收信号功率大于或等于第二阈值的小区包括小区1、小区2、小区3和小区4，在第一区域范围内允许该目标网络切片的小区包括小区2、小区4和小区6，则可以将小区2和小区4确定为目标小区。
可选的，若第一核心网设备发送的网络切片信息中只包括第一区域范围内不同无线接入网设备允许的网络切片，AS可以将接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同的小区确定为目标小区。
步骤五：AS将上述目标小区支持的PLMN信息发送至所述NAS，该PLMN信息可以是一个目标小区支持的PLMN信息，也可以是多个目标小区支持的PLMN信息的集合。
步骤六：NAS根据目标小区支持的PLMN信息确定优先级最高的PLMN为第一PLMN。可选的，NAS也可以根据历史使用情况从多个PLMN中确定第一PLMN。
应理解，同一无线接入网设备或者同一小区在不同PLMN下允许的网络切片可能存在差异。AS上报的目标小区支持的PLMN可能是该目标小区支持的所有的PLMN，因此在步骤六中，NAS可以对AS上报的目标小区支持的PLMN做进一步的筛选，筛选出的允许该网络切片的PLMN，再从筛选出的PLMN中确定优先级最高的PLMN为第一PLMN。
270，第一终端设备根据第一PLMN和目标网络切片确定第一小区。该第一小区就是第一终端设备最终确定请求接入的小区。
第一终端设备将不同无线接入网设备或不同小区允许的网络切片信息作为先验信息，进行小区选择。具体的实现方式可以包括：
实现方式一：
步骤一：第一终端设备的AS在确定的第一PLMN中检测接收信号功率大于或等于第二阈值的小区，即检测信号强度较强的小区，第二阈值可以为-84dBm。
步骤二：AS从接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区。接收信号功率大于第一阈值的小区即为满足S准则的小区。其中，S准则为：
Srxlev>0；Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)–Pcompensation
其中，Qrxlevmeas是候选小区的参考信号接收功率RSRP；Qrxlevmin和Qrxlevminoffset都是在系统信息块(system information block，SIB)中配置的小区驻留的最小接收电平，仅当UE驻留在受访的公共陆地移动网(visited Public Land Mobile Network，VPLMN)小区的时候才用到Qrxlevminoffset；Pcompensation是取UE上行最大可使用的发射功率PEMAX减去UE最大射频输出功率PUMAX的差与0之中的最大值，即MAX(PEMAX－PUMAX，0)。
步骤三：AS将满足上述接收信号功率大于第一阈值对应的小区标识发送至第一终端设备的NAS；
步骤四：NAS根据第一核心网设备发送的网络切片信息确定允许该目标网络切片的无线接入网设备的标识或小区的标识；若第一核心网设备发送的网络切片信息中只包括第一区域范围内不同无线接入网设备允许的网络切片，则NAS只能确定允许该目标网络切片的无线接入网设备的标识；若第一核心网设备发送的网络切片信息中包括第一区域范围内不同小区允许的网络切片，则NAS可以确定允许该目标网络切片的小区的标识。
步骤五：NAS将所述接收信号功率大于第一阈值的小区中对应的小区标识与允许该目标网络切片的小区的标识相同的小区确定为第一小区；
可选的，若第一核心网设备发送的网络切片信息中只包括第一区域范围内不同无线接入网设备允许的网络切片，NAS可以将接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同的小区确定为第一小区；
第一小区的数量可能为一个，也可能为多个，当第一小区的数量为多个时，第一终端设备可以接入其中任意一个小区。
实现方式二：
步骤一：第一终端设备的NAS向第一终端设备的AS发送允许该目标网络切片的无线接入网设备的标识或小区的标识；
步骤二：AS在第一PLMN覆盖的小区中小区的标识与允许该目标网络切片的小区的标识相同的小区中检测接收信号功率大于第一阈值的小区；或者，AS在第一PLMN覆盖的小区中小区的标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同的小区中检测接收信号功率大于第一阈值的小区，其中，接收信号功率大于第一阈值的小区即为满足S准则的小区。
步骤三：AS将接收信号功率大于第一阈值的小区的标识发送至NAS；
步骤四：NAS从接收信号功率大于第一阈值的小区中确定第一小区。
基于上述技术方案，第一终端设备根据第一核心网设备发送的不同无线接入网设备或该无线接入网设备控制的不同小区分别支持或允许网络切片确定目标网络切片，根据该目标网络切片信息确定第一PLMN，再根据该第一PLMN和目标网络切片确定请求接入的小区，可以避免第一终端设备请求接入的小区不允许其目标网络切片，从而提高用户体验。
可选的，若第一终端设备根据网络切片信息，经历过若干次尝试后都没有找到允许其目标网络切片的小区，该第一终端设备可以向无线接入网设备或者第一核心网设备发送检测失败指示，无线接入网设备或者第一核心网设备再对该第一终端设备进行重定向、切换或双联接操作，以使该第一终端设备接入允许其目标网络切片的小区。应理解，无线接入网设备可以是允许该目标网络切片的无线接入网设备，也可以是其他无线接入网设备。如图4所示，出示了本申请实施例的另一种小区选择的方法400的流程交互图。具体过程包括：
410，第一终端设备向无线接入网设备发送检测失败指示信息，可选的，该检测失败指示信息中可以包括该第一终端设备选择的目标网络切片的标识信息，用于指示该目标网络切片不被网络支持；
420，该无线接入网设备接收该检测失败指示信息；
430，该无线接入网设备对该第一终端设备执行重定向、切换或双联接操作。
如图5所示，出示了本申请实施例的另一种小区选择的方法500的流程交互图。具体过程包括：
510，第一终端设备向第一核心网设备发送检测失败指示信息，可选的，该检测失败指示信息中可以包括该第一终端设备选择的目标网络切片的标识信息，用于指示该目标网络切片不被网络支持；应理解，第一终端设备也可以向其他核心网设备发送失败指示信息。
520，该第一核心网设备接收该检测失败指示信息；
530，该第一核心网设备可以对该第一终端设备执行重定向、切换或双联接操作，第一核心网设备也可以指示当前UE接入的无线接入网设备对该第一终端设备进行重定向、切换或者双连接。
在本申请的技术方案中，无线接入网设备可以向第一核心网设备发送该无线接入网设备支持的频点信息以及不同频点分别支持的网络切片；应理解，无线接入网设备也可以向第一核心网设备发送该无线接入网设备控制的不同小区支持的频点信息，以及不同频点下不同小区支持的网络切片。
因此，第一核心网设备向第一终端设备发送的网络切片信息可以包括在第一区域范围内不同无线接入网设备支持的频点信息以及不同频点分别允许或支持的网络切片。
第一终端设备根据第一核心网设备发送的网络切片信息确定目标网络切片之后，根据目标网络切片确定第一PLMN。可选的，具体的实现方式还可以包括：
步骤一：第一终端设备的AS在全频范围内检测接收信号功率大于或等于第二阈值的小区，第二阈值可以为-84dBm，换言之，第一终端设备的AS在全频范围内检测信号强度较强的小区；
步骤二：第一终端设备的AS将接收信号功率大于或等于第二阈值的小区对应的小区标识、该小区支持的频点以及支持的PLMN发送至所述第一终端设备的NAS；
步骤三：NAS根据第一核心网设备发送的网络切片信息确定允许该目标网络切片的无线接入网设备的标识以及对应的频点；
步骤四：NAS将接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同、且该小区支持的频点与允许该目标网络切片的无线接入网设备对应的频点相同的小区确定为目标小区。
步骤五：NAS根据选定的目标小区支持的PLMN信息确定优先级最高的PLMN为第一PLMN；一个目标小区可能支持多个PLMN，且支持的PLMN具有优先级顺序。若目标小区为多个，可以将多个目标小区分别支持的多个PLMN中优先级最高的PLMN确定为第一PLMN。可选的，NAS也可以根据历史使用情况确定第一PLMN，该第一PLMN可能不是目标小区支持的多个PLMN中优先级最高的。
应理解，同一无线接入网设备或者同一小区在不同PLMN下允许的网络切片可能存在差异。因此在步骤五中，NAS可以对目标小区支持的PLMN做进一步的筛选，筛选出的允许该网络切片的PLMN，再从筛选出的PLMN中确定优先级最高的PLMN为第一PLMN。
可选的，具体的实现方式还可以包括：
步骤一：第一终端设备的非接入层NAS根据第一核心网设备发送的网络切片信息确定允许该目标网络切片的无线接入网设备的标识以及该无线接入网设备支持的频点；
步骤二：NAS向第一终端设备的AS发送允许该目标网络切片的无线接入网设备的标识以及该无线接入网设备支持的频点信息；
步骤三：AS根据允许该目标网络切片的无线接入网设备支持的频点信息逐频点检测接收信号功率大于或等于第二阈值的小区，其中，第二阈值可以为-84dBm；该实施方式可以避免AS在全频范围内检测接收信号功率大于或等于第二阈值的小区，只需在允许该目标网络切片的无线接入网设备支持的频点上检测接收信号功率大于或等于第二阈值的小区。
步骤四：AS将接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同的小区确定为目标小区。
步骤五：AS将上述目标小区支持的PLMN信息发送至所述NAS，该PLMN信息可以是一个目标小区支持的PLMN信息，也可以是多个目标小区支持的PLMN信息的集合。
步骤六：NAS根据目标小区支持的PLMN信息确定优先级最高的PLMN为第一PLMN。可选的，NAS也可以根据历史使用情况从多个PLMN中确定第一PLMN。
应理解，同一无线接入网设备或者同一小区在不同PLMN下允许的网络切片可能存在差异。AS上报的目标小区支持的PLMN可能是该目标小区支持的所有的PLMN，因此在步骤六中，NAS可以对AS上报的目标小区支持的PLMN做进一步的筛选，筛选出的允许该网络切片的PLMN，再从筛选出的PLMN中确定优先级最高的PLMN为第一PLMN。
第一终端设备确定完第一PLMN之后，根据该第一PLMN和目标网络切片确定第一小区，该第一小区就是第一终端设备最终确定请求接入的小区。可选的，具体的实现方式还可以包括：
步骤一：第一终端设备的AS在确定的第一PLMN中检测接收信号功率大于或等于第二阈值的小区，即检测信号强度较强的小区，第二阈值可以为-84dBm；
步骤二：AS从接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区；接收信号功率大于第一阈值的小区即为满足S准则的小区；
步骤三：AS将上述接收信号功率大于第一阈值的小区对应的小区标识以及该小区支持的频点发送至第一终端设备的NAS；
步骤四：NAS根据第一核心网设备发送的网络切片信息确定允许该目标网络切片的无线接入网设备的标识以及对应的频点；
步骤五：NAS将接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同、且该小区支持的频点与允许该目标网络切片的无线接入网设备对应的频点相同的小区确定为第一小区；其中，第一小区的数量可能为一个，也可能为多个，当第一小区的数量为多个时，第一终端设备可以接入其中任意一个小区。
可选的，具体的实现方式还可以包括：
步骤一：第一终端设备的NAS向第一终端设备的AS发送允许目标网络切片的无线接入网设备的标识以及该无线接入网设备支持的频点；
步骤二：AS根据允许该目标网络切片的无线接入网设备支持的频点信息在第一PLMN覆盖的小区中逐频点检测接收信号功率大于第一阈值的小区，；
步骤三：AS将接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与允许该目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；并将目标小区的标识发送至NAS；
步骤四：NAS从接收信号功率大于第一阈值的目标小区中确定第一小区。
具体而言，同一小区可能支持一个或多个频点，不同频点下小区允许的网络切片不同，NAS可以根据目标小区支持的不同频点下允许的网络切片信息确定允许该目标网络切片的频点为驻留频点。可选的，若第一终端设备根据网络切片信息，经历过若干次尝试后都没有找到允许其目标网络切片的小区，该第一终端设备可以向无线接入网设备或者第一核心网设备发送检测失败指示，无线接入网设备或者第一核心网设备再对该第一终端设备进行重定向、切换或双联接操作，以使该第一终端设备接入允许其目标网络切片的小区。
本申请实施例提出了一种通信装置600，如图6所示，图6示出了本申请实施例的一种通信装置600的示意性框图。该通信装置600包括：
处理单元610，用于确定目标网络切片；
所述处理单元610还用于，根据所述目标网络切片确定第一公共陆地移动网PLMN；
所述处理单元610还用于，根据所述第一PLMN和所述目标网络切片确定第一小区，所述第一小区接收信号功率大于第一阈值。
可选的，所述装置还包括：收发单元620，用于接收第一核心网设备发送的网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片；
所述处理单元610具体用于，根据所述网络切片信息确定所述目标网络切片，所述目标网络切片属于所述在第一区域范围内不同无线接入网设备或不同小区允许的网络切片 中的网络切片。
可选的，在一种实现方式中，所述处理单元610具体用于：
在全频段范围内检测接收信号功率大于或等于第二阈值的小区；
确定所述接收信号功率大于或等于第二阈值的小区对应的小区标识以及支持的PLMN信息；
根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；
根据所述目标小区支持的PLMN信息确定优先级最高的PLMN为所述第一PLMN。
可选的，在另一种实现方式中，所述处理单元610具体用于：
根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
在全频段范围内检测接收信号功率大于或等于第二阈值的小区；
将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；
确定所述目标小区支持的PLMN信息；
根据所述PLMN信息确定优先级最高的PLMN为所述第一PLMN。
可选的，在一种实现方式中，所述处理单元610具体用于：
从所述第一PLMN覆盖的所有小区中检测接收信号功率大于或等于第二阈值的小区；
从所述接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区；
确定所述接收信号功率大于第一阈值的小区对应的小区标识；
根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
将所述接收信号功率大于第一阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为所述第一小区，或，将所述接收信号功率大于第一阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为所述第一小区。
可选的，在另一种实现方式中，所述处理单元610具体用于：
根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
在所述第一PLMN覆盖的小区中小区的标识与所述允许所述目标网络切片的小区的标识相同的小区中检测接收信号功率大于第一阈值的小区，或，在所述第一PLMN覆盖的小区中小区的标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区中检测接收信号功率大于第一阈值的小区；
从所述接收信号功率大于第一阈值的小区中确定所述第一小区。
可选的，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
本申请实施例提出了一种通信装置700，如图7所示，图7示出了本申请实施例的另一种通信装置700的示意性框图。该通信装置700包括：
收发单元710，用于向第一终端设备发送网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片。
可选的，在向第一终端设备发送网络切片信息之前，所述收发单元710还用于：接收无线接入网设备发送的所述无线接入网设备支持的网络切片或所述无线接入网设备控制的不同小区分别支持的网络切片，所述无线接入网设备为所述第一区域范围内的网络设备。
可选的，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
本申请实施例提出了一种通信设备800，如图8所示，图8示出了本申请实施例的一种通信设备800的示意性框图。该通信装置800包括：
处理器810和收发器820，所述收发器820用于接收计算机代码或指令，并传输至所述处理器，所述处理器810运行所述计算机代码或指令，以实现本申请实施例中的方法。
上述的处理器820可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
上述的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
应理解，上述存储器可以集成于处理器中，或者，上述处理器和存储器也可以集成在同一芯片上，也可以分别处于不同的芯片上并通过接口耦合的方式连接。本申请实施例对此不做限定。
本申请实施例还提供了一种计算机可读存储介质，其上存储有用于实现上述方法实施例中的方法的计算机程序。当该计算机程序在计算机上运行时，使得该计算机可以实现上述方法实施例中的方法。
另外，本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系；本申请中术语“至少一个”，可以表示“一个”和“两个或两个以上”，例如，A、B和C中至少一个，可以表示：单独存在A，单独存在B，单独存在C、同时存在A和B，同时存在A和C，同时存在C和B，同时存在A和B和C，这七种情况。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。本领域技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本领域的技术人员可以清楚地了解到，为描述的方便和简洁，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。
所述功能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)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(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (24)

  1. 一种小区选择的方法，其特征在于，包括：
    第一终端设备确定目标网络切片；
    所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN；
    所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区。
  2. 根据权利要求1所述的方法，其特征在于，所述第一终端设备确定目标网络切片，包括：
    所述第一终端设备接收第一核心网设备发送的网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片；
    所述第一终端设备根据所述网络切片信息确定所述目标网络切片，所述目标网络切片属于所述在第一区域范围内不同无线接入网设备或不同小区允许的网络切片中的网络切片。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN，包括：
    所述第一终端设备的接入层AS在全频段范围内检测接收信号功率大于或等于第二阈值的小区；
    所述AS将所述接收信号功率大于或等于第二阈值的小区对应的小区标识以及支持的PLMN信息发送至所述第一终端设备的非接入层NAS；
    所述NAS根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
    所述NAS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，所述NAS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；
    所述NAS根据所述目标小区支持的PLMN信息确定优先级最高的PLMN为所述第一PLMN。
  4. 根据权利要求1或2所述的方法，其特征在于，所述第一终端设备根据所述目标网络切片确定第一公共陆地移动网PLMN，包括：
    所述第一终端设备的非接入层NAS根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
    所述NAS向所述第一终端设备的接入层AS发送所述允许所述目标网络切片的无线接入网设备或小区的标识；
    所述AS在全频段范围内检测接收信号功率大于或等于第二阈值的小区；
    所述AS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，所述AS将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；
    所述AS将所述目标小区支持的PLMN信息发送至所述NAS；
    所述NAS根据所述PLMN信息确定优先级最高的PLMN为所述第一PLMN。
  5. 根据权利要求3或4所述的方法，其特征在于，所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，包括：
    所述AS从所述第一PLMN覆盖的所有小区中检测接收信号功率大于或等于第二阈值的小区；
    所述AS从所述接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区；
    所述AS将所述接收信号功率大于所述第一阈值的小区对应的小区标识发送至所述NAS；
    所述NAS根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
    所述NAS将所述接收信号功率大于所述第一阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为所述第一小区，或，所述NAS将所述接收信号功率大于所述第一阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为所述第一小区。
  6. 根据权利要求3或4所述的方法，其特征在于，所述第一终端设备根据所述第一PLMN和所述目标网络切片确定第一小区，包括：
    所述NAS向所述AS发送所述允许所述目标网络切片的无线接入网设备或小区的标识；
    所述AS在所述第一PLMN覆盖的小区中小区的标识与所述允许所述目标网络切片的小区的标识相同的小区中检测接收信号功率大于第一阈值的小区，或，所述AS在所述第一PLMN覆盖的小区中小区的标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区中检测接收信号功率大于所述第一阈值的小区；
    所述AS将所述接收信号功率大于所述第一阈值的小区的标识发送至所述NAS；
    所述NAS从所述接收信号功率大于所述第一阈值的小区中确定所述第一小区。
  7. 根据权利要求2至6中任一项所述的方法，其特征在于，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
  8. 一种小区选择的方法，其特征在于，包括：
    第一核心网设备向第一终端设备发送网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片。
  9. 根据权利要求8所述的方法，其特征在于，所述第一核心网设备向第一终端设备发送网络切片信息之前，所述方法还包括：
    所述第一核心网设备接收无线接入网设备发送的所述无线接入网设备支持的网络切片或所述无线接入网设备控制的不同小区分别支持的网络切片，所述无线接入网设备为所述第一区域范围内的网络设备。
  10. 根据权利要求8或9所述的方法，其特征在于，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
  11. 一种通信装置，其特征在于，包括：
    处理单元，用于确定目标网络切片；
    所述处理单元还用于，根据所述目标网络切片确定第一公共陆地移动网PLMN；
    所述处理单元还用于，根据所述第一PLMN和所述目标网络切片确定第一小区。
  12. 根据权利要求11所述的通信装置，其特征在于，所述装置还包括：收发单元，用于接收第一核心网设备发送的网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片；
    所述处理单元具体用于，根据所述网络切片信息确定所述目标网络切片，所述目标网络切片属于所述在第一区域范围内不同无线接入网设备或不同小区允许的网络切片中的网络切片。
  13. 根据权利要求11或12所述的通信装置，其特征在于，所述处理单元具体用于：
    在全频段范围内检测接收信号功率大于或等于第二阈值的小区；
    确定所述接收信号功率大于或等于第二阈值的小区对应的小区标识以及支持的PLMN信息；
    根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
    将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；
    根据所述目标小区支持的PLMN信息确定优先级最高的PLMN为所述第一PLMN。
  14. 根据权利要求11或12所述的通信装置，其特征在于，所述处理单元具体用于：
    根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
    在全频段范围内检测接收信号功率大于或等于第二阈值的小区；
    将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为目标小区，或，将所述接收信号功率大于或等于第二阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为目标小区；
    确定所述目标小区支持的PLMN信息；
    根据所述PLMN信息确定优先级最高的PLMN为所述第一PLMN。
  15. 根据权利要求13或14所述的通信装置，其特征在于，所述处理单元具体用于：
    从所述第一PLMN覆盖的所有小区中检测接收信号功率大于或等于第二阈值的小区；
    从所述接收信号功率大于或等于第二阈值的小区中检测接收信号功率大于第一阈值的小区；
    确定所述接收信号功率大于所述第一阈值的小区对应的小区标识；
    根据所述网络切片信息确定允许所述目标网络切片的无线接入网设备或小区的标识；
    将所述接收信号功率大于所述第一阈值的小区中对应的小区标识与所述允许所述目标网络切片的小区的标识相同的小区确定为所述第一小区，或，将所述接收信号功率大于所述第一阈值的小区中对应的小区标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区确定为所述第一小区。
  16. 根据权利要求13或14所述的通信装置，其特征在于，所述处理单元具体用于：
    确定允许所述目标网络切片的无线接入网设备或小区的标识；
    在所述第一PLMN覆盖的小区中小区的标识与所述允许所述目标网络切片的小区的标识相同的小区中检测接收信号功率大于第一阈值的小区，或，在所述第一PLMN覆盖的小区中小区的标识包含的无线接入网设备标识与所述允许所述目标网络切片的无线接入网设备的标识相同的小区中检测接收信号功率大于所述第一阈值的小区；
    从所述满足所述第一预设条件的小区中确定所述第一小区。
  17. 根据权利要求12至16中任一项所述的方法，其特征在于，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
  18. 一种通信装置，其特征在于，包括：
    收发单元，用于向第一终端设备发送网络切片信息，所述网络切片信息包括在第一区域范围内不同无线接入网设备或不同小区分别允许或支持的网络切片。
  19. 根据权利要求18所述的通信装置，其特征在于，所述向第一终端设备发送网络切片信息之前，所述收发单元还用于：
    接收无线接入网设备发送的所述无线接入网设备支持的网络切片或所述无线接入网设备控制的不同小区分别支持的网络切片，所述无线接入网设备为所述第一区域范围内的网络设备。
  20. 根据权利要求18或19所述的通信装置，其特征在于，所述第一区域范围为至少一个跟踪区域TA的区域范围或者至少一个注册区域RA的区域范围。
  21. 一种通信设备，其特征在于，包括：处理器和收发器，所述收发器用于接收计算机代码或指令，并传输至所述处理器，所述处理器运行所述计算机代码或指令，如权利要求1至7中任一项所述的方法。
  22. 一种通信设备，其特征在于，包括：处理器和收发器，所述收发器用于接收计算机代码或指令，并传输至所述处理器，所述处理器运行所述计算机代码或指令，如权利要求8至10中任一项所述的方法。
  23. 一种计算机可读存储介质，其特征在于，包括：
    所述计算机可读介质存储有计算机程序；
    所述计算机程序在计算机上运行时，使得计算机执行权利要求1至7中任一项所述的方法。
  24. 一种计算机可读存储介质，其特征在于，包括：
    所述计算机可读介质存储有计算机程序；
    所述计算机程序在计算机上运行时，使得计算机执行权利要求8至10中任一项所述的方法。
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