WO2022198446A1 - 选择网络的方法、装置、设备及存储介质 - Google Patents

选择网络的方法、装置、设备及存储介质 Download PDF

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Publication number
WO2022198446A1
WO2022198446A1 PCT/CN2021/082415 CN2021082415W WO2022198446A1 WO 2022198446 A1 WO2022198446 A1 WO 2022198446A1 CN 2021082415 W CN2021082415 W CN 2021082415W WO 2022198446 A1 WO2022198446 A1 WO 2022198446A1
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WIPO (PCT)
Prior art keywords
plmn
signal quality
plmns
quality threshold
terminal device
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Application number
PCT/CN2021/082415
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English (en)
French (fr)
Inventor
杨皓睿
付喆
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2021/082415 priority Critical patent/WO2022198446A1/zh
Priority to CN202180080196.8A priority patent/CN116548021A/zh
Priority to EP21932077.7A priority patent/EP4271046A4/en
Publication of WO2022198446A1 publication Critical patent/WO2022198446A1/zh
Priority to US18/354,056 priority patent/US20230362804A1/en

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    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a method, apparatus, device, and storage medium for selecting a network.
  • the user's terminal equipment needs to perform the selection of the public land mobile network (PLMN) after just starting up or entering the idle state, and after accessing the selected PLMN , using the services provided by the PLMN network.
  • PLMN public land mobile network
  • the access layer of the terminal device reads the system information of the surrounding cells, and after acquiring the PLMN IDs of the surrounding cells from the system information, it will report these PLMN IDs to non- Access stratum (non access stratum, NAS) layer, so that the NAS layer selects the final PLMN according to the priority of the PLMN.
  • non- Access stratum non access stratum
  • the terminal device since the terminal device only selects the final access network based on the priority of the PLMN, when the quality of the network accessing the PLMN is poor, there may be problems of network instability and repeated disconnection of users, resulting in poor user experience.
  • Embodiments of the present application provide a method, apparatus, device, and storage medium for selecting a network, which are used to solve the problem of poor user experience in existing PLMN selection methods due to network instability and repeated user disconnections.
  • the embodiments of the present application may provide a method for selecting a network, including:
  • the terminal device acquires the first parameter of each PLMN in the at least two public land mobile network PLMNs, where the first parameter includes: signal quality and priority;
  • the terminal device selects a first PLMN from the at least two PLMNs according to the first parameter of each of the at least two PLMNs.
  • the embodiments of the present application may provide a method for selecting a network, including:
  • the network device configures or updates the signal quality threshold of each of the at least two PLMNs for the terminal device
  • the network device sends the signal quality threshold of each of the at least two PLMNs to the terminal device.
  • an embodiment of the present application may provide an apparatus for selecting a network, including:
  • an acquisition module configured to acquire the first parameter of each PLMN in the at least two public land mobile network PLMNs, where the first parameter includes: signal quality and priority;
  • a processing module configured to select a first PLMN from the at least two PLMNs according to a first parameter of each of the at least two PLMNs.
  • an embodiment of the present application may provide an apparatus for selecting a network, including:
  • a processing module for configuring or updating the signal quality threshold of each of the at least two PLMNs for the terminal device
  • a sending module configured to send the signal quality threshold of each of the at least two PLMNs to the terminal device.
  • an embodiment of the present application may provide a terminal device, including:
  • the memory stores computer-executable instructions
  • the processor executes the computer-executable instructions stored in the memory, so that the processor executes the method provided in the first aspect.
  • the above-mentioned processor may be a chip.
  • an embodiment of the present application may provide a network device, including:
  • the interface for communication between processor, memory, transmitter and terminal equipment
  • the memory stores computer-executable instructions
  • the processor executes the computer-executable instructions stored in the memory, so that the processor executes the method provided in the second aspect.
  • the above-mentioned processor may be a chip.
  • an embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, are used to implement the first aspect.
  • an embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, are used to implement the second aspect.
  • an embodiment of the present application provides a program for executing the method according to the first aspect when the program is executed by a processor.
  • an embodiment of the present application provides a program for executing the method described in the second aspect when the program is executed by a processor.
  • an embodiment of the present application provides a computer program product, including program instructions, where the program instructions are used to implement the method described in the first aspect.
  • embodiments of the present application provide a computer program product, including program instructions, where the program instructions are used to implement the method described in the second aspect.
  • an embodiment of the present application provides a chip, including: a processing module and a communication interface, where the processing module can execute the method described in the first aspect.
  • the chip also includes a storage module (eg, memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to perform the first aspect. the method described.
  • a storage module eg, memory
  • the storage module is used for storing instructions
  • the processing module is used for executing the instructions stored in the storage module
  • the execution of the instructions stored in the storage module causes the processing module to perform the first aspect. the method described.
  • an embodiment of the present application provides a chip, including: a processing module and a communication interface, where the processing module can execute the method described in the second aspect.
  • the chip also includes a storage module (eg, memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to perform the second aspect the method described.
  • a storage module eg, memory
  • the storage module is used for storing instructions
  • the processing module is used for executing the instructions stored in the storage module
  • the execution of the instructions stored in the storage module causes the processing module to perform the second aspect the method described.
  • a fifteenth aspect of the present application provides a communication system, including: a network device and a terminal device;
  • the terminal device is the device described in the third aspect
  • the network device is the device described in the fourth aspect.
  • the embodiments of the present application provide a method, apparatus, device, and storage medium for selecting a network.
  • the terminal device obtains the first parameter of each PLMN in at least two PLMNs, where the first parameter includes: signal quality and priority, according to The first parameter of each of the at least two PLMNs, the first PLMN is selected from the above at least two PLMNs.
  • the terminal device performs the PLMN selection, the priority of the PLMN and the signal quality of the PLMN are considered at the same time, so that the signal quality of the first PLMN selected finally meets the requirements and has a higher priority, which effectively avoids the need for users to receive
  • the incoming network is unstable and users are repeatedly dropped, which improves the user experience.
  • FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application.
  • Fig. 2 is the structural representation of IMSI in the USIM card
  • Embodiment 3 is a schematic flowchart of Embodiment 1 of a method for selecting a network provided by an embodiment of the present application;
  • FIG. 4 is an interactive schematic diagram of Embodiment 2 of a method for selecting a network provided by an embodiment of the present application
  • Embodiment 3 is a schematic flowchart of Embodiment 3 of a method for selecting a network provided by an embodiment of the present application;
  • Embodiment 4 is a schematic flowchart of Embodiment 4 of a method for selecting a network provided by an embodiment of the present application;
  • FIG. 7 is a schematic flowchart of Embodiment 5 of a method for selecting a network provided by an embodiment of the present application.
  • Embodiment 8 is a schematic flowchart of Embodiment 6 of a method for selecting a network provided by an embodiment of the present application;
  • Embodiment 9 is a schematic structural diagram of Embodiment 1 of an apparatus for selecting a network provided by the present application.
  • Embodiment 10 is a schematic structural diagram of Embodiment 2 of an apparatus for selecting a network provided by the present application;
  • FIG. 11 is a schematic structural diagram of an embodiment of a terminal device provided by this application.
  • FIG. 12 is a schematic structural diagram of a network device provided by this application.
  • PLMN public land mobile network
  • PLMN is a network established and operated by the government or its approved operators for the purpose of providing land mobile communication services to the public.
  • the network is usually interconnected with the public switched telephone network (PSTN) to form the entire region. or national-scale communications networks.
  • PSTN public switched telephone network
  • each PLMN should have a clear identification (number), which is broadcast by the base station as system information, so that terminal devices under the base station can receive it.
  • MCC mobile country codes
  • MNC mobile network codes
  • each PLMN table will have multiple PLMNs.
  • the multiple PLMNs included in each PLMN table may be as follows:
  • Registered PLMN (registered PLMN, RPLMN): The PLMN registered by the terminal device before the last shutdown or disconnection;
  • Equivalent PLMN Equivalent PLMN
  • EPLMN Equivalent PLMN
  • Equivalent home PLMN Equivalent home PLMN, EHPLMN: the home PLMN in the same status as the PLMN currently selected by the terminal device;
  • Home PLMN home PLMN, HPLMN: the PLMN to which the end user belongs; the MCC and the International Mobile Subscriber Identity (IMSI) number contained in the Universal Subscriber Identity Module (USIM) card in the terminal equipment.
  • IMSI International Mobile Subscriber Identity
  • USIM Universal Subscriber Identity Module
  • Visited PLMN Visited PLMN (visited PLMN, VPLMN): The PLMN visited by the end user.
  • the PLMN is not exactly the same as the MCC and MNC in the IMSI on the USIM card in the terminal device;
  • User controlled PLMN (user controlled PLMN, UPLMN): a parameter related to PLMN selection stored on the USIM card;
  • OLMN Operator controlled PLMN
  • Forbidden PLMN forbidden PLMN, FPLMN: a PLMN that is forbidden to access, usually a terminal device will add it to this list after it tries to access a PLMN and is rejected;
  • Acquireable PLMN (approve PLMN, APLMN):
  • the terminal can find at least one cell on the APLMN and can read the PLMN identification information of the PLMN.
  • PLMNs have different priorities, and when the terminal device selects a PLMN, it will proceed in the following order: RPLMN, EPLMN, HPLMN, EHPLMN, UPLMN, OPLMN, and other PLMNs.
  • FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • the communication system may include at least one terminal device and at least two network devices.
  • FIG. 1 illustrates one terminal device 11 and two network devices (a first network device 12 and a second network device 13 ), that is, the terminal device 11 is located within the coverage of the two networks.
  • the first network device 12 is a network device in the first PLMN
  • the second network device 13 is a network device in the second PLMN.
  • the first PLMN is used as the network device.
  • the first network device 12 is included within the coverage of the PLMN
  • the second network device 13 is included within the coverage of the second PLMN.
  • the number of devices covered by the first PLMN and the second PLMN is not limited here.
  • the terminal device 11 is within the coverage of the first PLMN and the second PLMN at the same time, at this time, when the terminal device 11 is powered on or restarted or enters the idle state, it needs to reselect the PLMN.
  • the priority and signal quality of the second PLMN and the priority and signal quality of the second PLMN determine the final selected PLMN from the first PLMN and the second PLMN.
  • the network where each network device is located may include: a non-3GPP interworking network element (non-3GPP interworking function, N3IWF), access and mobility management (access and mobility) management function, AMF), session management function (session management function, SMF), user plane function (user plane function, UPF) and other functional network elements.
  • N3IWF non-3GPP interworking function
  • AMF access and mobility management
  • AMF session management function
  • SMF session management function
  • UPF user plane function
  • the embodiment forms of the first network device and the second network device in the embodiments of the present application may be any network element of the network where they are located.
  • AMF is mainly used for access and mobility management functions
  • UPF is mainly used for receiving control signaling and processing user plane data and other functions.
  • the network where each network device is located is not limited to including N3iwf, AMF, SMF, and UPF, but may also include: authentication server function network element (authentication server function, AUSF), unified data management (unified data management, UDM) ), authentication credential storage and processing function (authentication credential repository and processing function, ARPF) and other network elements, the embodiment of the present application is not limited to this.
  • AUSF is mainly used to perform authentication-related operations
  • UDM is used to perform functions such as user data management
  • ARPF is mainly used to perform storage and processing of user identities, keys, and contract data.
  • the communication system may further include more network devices, and the coverage of each network device may include other numbers of terminal devices.
  • the network devices and terminal devices included in the communication system are The quantity is not limited.
  • the terminal device 11 is connected to the first network device 12 or the second network device 13 in a wireless manner.
  • wireless communication may be performed between the terminal device 11 and a plurality of network devices using an unlicensed spectrum.
  • direct terminal device to device, D2D
  • communication may be performed between the terminal devices.
  • FIG. 1 is only a schematic diagram of a communication system, and the communication system may also include other network devices, such as core network devices, wireless relay devices, and wireless backhaul devices, or may include network controllers, mobile Other network entities, such as a management entity, are not limited to this embodiment of the present application.
  • network devices such as core network devices, wireless relay devices, and wireless backhaul devices, or may include network controllers, mobile Other network entities, such as a management entity, are not limited to this embodiment of the present application.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • long term evolution long term evolution
  • LTE long term evolution
  • LTE frequency division duplex frequency division duplex
  • FDD frequency division duplex
  • TDD Time division duplex
  • LTE-A advanced long term evolution
  • NR new radio
  • evolution systems of NR systems LTE on unlicensed bands (LTE-based access to unlicensed spectrum, LTE-U) system, NR (NR-based access to unlicensed spectrum, NR-U) system on unlicensed frequency bands, universal mobile telecommunication system (UMTS), global Worldwide interoperability for microwave access (WiMAX) communication systems, wireless local area networks (WLAN), wireless fidelity (WiFi), next-generation communication systems or other communication systems, etc.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • D2D device to device
  • M2M machine to machine
  • MTC machine type communication
  • V2V vehicle to vehicle
  • the network equipment involved in the embodiments of this application may be a common base station (such as a NodeB or eNB or gNB), a new radio controller (NR controller), a centralized network element (centralized unit), a new radio base station, Remote radio module, micro base station, relay, distributed unit (distributed unit), reception point (transmission reception point, TRP), transmission point (transmission point, TP) or any other equipment.
  • a common base station such as a NodeB or eNB or gNB
  • NR controller new radio controller
  • a centralized network element centralized unit
  • a new radio base station Remote radio module
  • micro base station relay, distributed unit (distributed unit)
  • reception point transmission reception point
  • TRP transmission point
  • TP transmission point
  • the terminal device may be any terminal, for example, the terminal device may be user equipment of machine type communication. That is to say, the terminal device may also be called user equipment (UE), mobile station (mobile station, MS), mobile terminal (mobile terminal), terminal (terminal), etc.
  • a radio access network (RAN) communicates with one or more core networks, for example, the terminal device may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc., for example, the terminal device may also Are portable, pocket-sized, hand-held, computer built-in or vehicle-mounted mobile devices that exchange language and/or data with a wireless access network.
  • UE user equipment
  • MS mobile station
  • terminal mobile terminal
  • terminal terminal
  • a radio access network (RAN) communicates with one or more core networks
  • the terminal device may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc.
  • the terminal device may also Are portable, pocket-sized, hand-held, computer built-in or vehicle-mounted mobile devices that exchange language and/or data
  • network equipment and terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and artificial satellites in the air.
  • the embodiments of the present application do not limit the application scenarios of the network device and the terminal device.
  • communication between the network device and the terminal device and between the terminal device and the terminal device can be performed through licensed spectrum (licensed spectrum), or through unlicensed spectrum (unlicensed spectrum), or both through licensed spectrum and Unlicensed spectrum for communications.
  • licensed spectrum licensed spectrum
  • unlicensed spectrum unlicensed spectrum
  • the embodiments of the present application do not limit the frequency spectrum used for communication between the network device and the terminal device.
  • the terminal device can work in any one of the three working modes, such as a shutdown state, a standby state, and an online state. Among them, the terminal device will be disconnected from the wireless network when it is in a power-off state. Therefore, after the terminal device is powered on, the primary task is to search for a network and register, that is, a network selection operation.
  • the network selection operation of the terminal equipment can be divided into two processes: PLMN selection and cell search.
  • the chip inside the terminal device will read the HPLMN Selector with Access Technology and the User Controlled PLMN Selector with Access Technology from the USIM card. Selector with Access Technology), Forbidden PLMN (Forbidden PLMNs), Equivalent HPLMN (Equivalent HPLMN), Operator controlled PLMN Selector with Access Technology) and other files, and the chip in the terminal device
  • the non-access (NAS) layer will trigger the access layer (AS) to read the system information of the surrounding cells, obtain the PLMN IDs of the surrounding cells from the system information, and then report these PLMN IDs to the NAS layer by the access layer.
  • the NAS layer selects the final PLMN from it.
  • the access layer will also report the signal quality of the PLMN below the quality threshold (for example, -110dB) to the NAS layer, that is, PLMN ID + signal quality.
  • the quality threshold for example, -110dB
  • the terminal device When the terminal device is powered on, it first selects the PLMN network, and then selects the cell. However, since the terminal device does not know which PLMN the SIM card or USIM card it is using when it is powered on, the terminal device first performs all frequency points after booting. Scan, which frequency signal is the best choice. At this time, no matter which operator it is, it will monitor the frequency correction channel (FCCH) and synchronization channel (SCH) of the frequency point, and then Monitor the broadcast control channel (BCCH), there is a base station identity code (BSIC) in the BCCH, and the network color code (NCC) in the BSIC can distinguish which operator the frequency is. If it is not suitable, select the frequency with the second strongest signal and continue to complete the above steps.
  • FCCH frequency correction channel
  • SCH synchronization channel
  • BCCH broadcast control channel
  • BSIC base station identity code
  • NCC network color code
  • the NAS layer in the terminal device follows the following sequence when selecting the PLMN:
  • HPLMN if the EHPLMN list does not exist or is empty
  • EHPLMN if the EHPLMN list exists
  • its English expression is: either the HPLMN (if the EHPLMN list is not present or is empty) or the highest priority EHPLMN(equivalent HPLMN)that is available(if the EHPLMN list is present).
  • the HPLMN ID can be obtained from the IMSI of the USIM card.
  • FIG. 2 is a schematic structural diagram of an IMSI in a USIM card.
  • IMSI is a sign that distinguishes mobile users, and is stored in the USIM card and can be used to distinguish valid information of mobile users. As shown in Figure 2, the total length of the IMSI does not exceed 15 digits, which are represented by numbers from 0 to 9.
  • the IMSI includes: MCC, MNC and mobile subscriber identification number (MSIN), where MCC is the mobile subscriber's identity number. Country code, occupying 3 digits; MNC is the mobile network number, usually occupying 2 or 3 digits, used to identify the mobile communication network to which the mobile user belongs; MSIN is used to identify the mobile user in a mobile communication network.
  • HPLMN Selector with Access Technology there is an HPLMN Selector with Access Technology (HPLMN Selector with Access Technology) file in the USIM card.
  • Table 1 is the structure of the HPLMN selector file with the access technology.
  • the identifier (Identifier) of the HPLMN selector file with access technology is 6F62
  • the structure (Structure) is transparent (Transparent)
  • the existing state is optional (Optional)
  • the short basic file identifier (The short elementary file identifier, SFI) is 13
  • the file size (File size) is 5n bytes (bytes), where n ⁇ 1, the update activity (Update activity) is low (low).
  • the access operations for the elementary file are divided into read (READ), update (UPDATE), deactivation (DEACTIVATE) and activation (ACTIVATE) ), among which, the reading (READ) needs to check that the personal identification number (PIN) is correct, and the update (UPDATE), deactivation (DEACTIVATE) and activation (ACTIVATE) need to meet the authorization (ADM).
  • READ read
  • UPDATE update
  • DEACTIVATE deactivation
  • ACTIVATE activation
  • ADM authorization
  • each byte in the HPLMN selector file with access technology is: bytes 1 to 3 are used to describe the first PLMN and are mandatory in the file. , M), the length is 3 bytes, bytes 4 to 5 are used to describe the identity of the first PLMN access technology, and are also required in the file (M), the length is 2 bytes; bytes 6 to 8 Used to describe the second PLMN, it is optional (Optional, O) in the file, the length is 3 bytes, and bytes 9 to 10 are used to describe the identification of the access technology of the second PLMN, which is also available in the file.
  • the length is 2 bytes; and so on, the bytes (5n-4) to (5n-2) are used to describe the nth PLMN, are optional (O) in the file, and the length is 3 bytes, bytes (5n-1) to (5n) are used for the identification of the nth PLMN access technology, and are also optional (0) in the file, with a length of 2 bytes.
  • the terminal device will choose the mobile 4G network first when choosing PLMN; and when there is no 4G coverage around, the terminal device will choose the mobile 2G network.
  • Each combination of PLMN and wireless access technology (determined based on the priority order) in the "User Controlled PLMN Selector with Access Technology" data file in the SIM card is expressed in English as: "each PLMN/access technology combination in the "User Controlled PLMN Selector with Access Technology” data file in the SIM(in priority order)".
  • Table 2 shows the structure of an operator-controlled PLMN selector file with an access technology.
  • the identifier (Identifier) of the PLMN selector file controlled by the operator with access technology is 6F61
  • the structure (Structure) is transparent (Transparent)
  • the existing state is optional (Optional)
  • the SFI is 11
  • the file size (File size) is 5n bytes (bytes), where n ⁇ 8, the update activity (Update activity) is low (low).
  • the access operations for EF are also divided into read (READ), update (UPDATE), deactivation (DEACTIVATE) and activation (ACTIVATE), wherein, read (READ) needs to check that the PIN is correct, update (UPDATE), deactivation (DEACTIVATE) and activation (ACTIVATE) need to satisfy authorization (ADM).
  • each byte in the operator-controlled PLMN selector file with access technology is: bytes 1 to 3 are used to describe the first PLMN (with the highest priority), It is mandatory (M) in the file and has a length of 3 bytes. Bytes 4 to 5 are used to describe the identification of the first PLMN access technology. It is also mandatory in the file (M) and has a length of 2 words.
  • Section; by analogy, bytes 36 to 38 are used to describe the eighth PLMN, which is required in the file (M), the length is 3 bytes, and bytes 39 to 40 are used to describe the eighth PLMN access
  • the identification of the technology, which is also mandatory in the file (M) has a length of 2 bytes; bytes 41 to 43 are used to describe the ninth PLMN, which is optional in the file (O) and has a length of 3 bytes.
  • bytes 44 to 45 are used to describe the identity of the ninth PLMN access technology, and are also optional (O) in the file, with a length of 2 bytes; and so on, bytes (5n-4) to (5n-2 ) is used to describe the Nth PLMN (with the lowest priority), is optional (O) in the file, has a length of 3 bytes, bytes (5n-1) to (5n) are used for the Nth PLMN
  • the identifier of the access technology which is also optional (O) in the file, and has a length of 2 bytes.
  • each PLMN will be followed by a RAT, and the higher the ranking, the higher the priority.
  • the terminal device will give priority to the priority of the PLMN when selecting the order of the PLMN, and will only consider the signal quality of the PLMN when a suitable PLMN cannot be determined through the priority of the PLMN. Therefore, in the prior art, the terminal device usually only selects the PLMN network to finally access based on the priority of the PLMN. Even if the signal quality of the high-priority PLMN is very poor, the terminal device will select the PLMN. At this time, there may be network problems. Stability and repeated disconnection of terminal devices, resulting in poor user experience.
  • the inventive conception process of the technical solution of the present application is as follows: since the terminal equipment in the prior art usually only considers the priority of the PLMN when selecting a PLMN, it may be that the terminal equipment selects a higher priority but has a lower signal quality. Poor PLMNs are common, especially in roaming scenarios, which may cause frequent disconnection of terminal devices, resulting in poor user experience, which may cause the operator to which the PLMN belongs to receive complaints.
  • the terminal equipment of the network has control requirements. For example, it can control that the signal quality of some PLMNs detected by the terminal equipment is greater than or equal to the signal quality threshold before allowing access, etc.
  • the inventor found that: if the terminal equipment selects Before the PLMN, refer to the signal quality of the PLMN and the priority of the PLMN, and remove the PLMN with poor quality, which can ensure that the selected PLMN is a PLMN with a higher priority and meets the signal quality requirements, effectively avoiding the terminal equipment. Line problems, improve the user experience.
  • an embodiment of the present application provides a method for selecting a network.
  • the terminal device obtains the first parameter of each PLMN in at least two PLMNs, where the first parameter includes: signal quality and priority, according to at least For the first parameter of each of the two PLMNs, the first PLMN is selected from the above at least two PLMNs.
  • the priority of the PLMN and the signal quality of the PLMN are considered at the same time, so that the signal quality of the first PLMN selected finally meets the requirements and has a higher priority, which effectively avoids the need for users to receive
  • the incoming network is unstable and users are repeatedly dropped, which improves the user experience.
  • FIG. 3 is a schematic flowchart of Embodiment 1 of a method for selecting a network provided by an embodiment of the present application. As shown in Figure 3, the method for selecting a network may include the following steps:
  • the terminal device acquires a first parameter of each of the at least two PLMNs, where the first parameter includes: signal quality and priority.
  • the selection of the PLMN will be performed. Specifically, the terminal device first searches or detects PLMNs existing in the scene where it is located. Usually, there are multiple PLMNs in the same scene, and the embodiments of the present application are explained with the existence of at least two PLMNs.
  • the terminal device determines the existence of at least two PLMNs by detecting whether there is a signal sent by a network device within the coverage of the PLMN. Therefore, when the terminal device detects the at least two PLMNs, it can also obtain the at least two PLMNs. Signal quality for each PLMN.
  • the signal quality of each PLMN is usually the signal quality detected by the terminal device, that is, the terminal device determines according to the signal quality of the received system message.
  • the signal quality of the PLMN may be the reference signal receiving power (reference signal receiving power, RSRP) received by the terminal device, or may be the power of other signals, which is not limited in this embodiment of the present application.
  • RSRP reference signal receiving power
  • the terminal device selects a first PLMN from the at least two PLMNs according to the first parameter of each of the at least two PLMNs.
  • the terminal device when the first parameter includes: signal quality and priority, and the terminal device obtains the signal quality of each of the at least two PLMNs, it can query the PLMN list preset in the terminal device, and determine each PLMN list. The priority of each PLMN, and then on the basis of the known priority of each PLMN, combined with the signal quality of each PLMN, a PLMN is finally selected from the at least two PLMNs detected.
  • the finally selected PLMN is referred to as the first PLMN, and the embodiment of the present application does not limit the specific implementation of the first PLMN.
  • a user configuration file such as an HPLMN selector file with an access technology or an operator-controlled PLMN selector file with an access technology in the terminal device may be preset with a preset value.
  • the signal quality threshold of each PLMN is written, and the signal quality threshold can be understood as the minimum signal quality that the terminal device is allowed to select.
  • the terminal device determines that the signal quality of a certain PLMN is lower than the signal quality threshold of the PLMN, it can be discarded and not selected under normal circumstances. That is, the first PLMN selected by the terminal device from the above-mentioned at least two PLMNs may satisfy the following conditions: the signal quality of the first PLMN is greater than or equal to the signal quality threshold of the first PLMN, and the priority of the first PLMN is in the above-mentioned The priority in at least two PLMNs is higher.
  • the terminal device may also sort the above at least two PLMNs in descending order of signal quality according to the signal quality of each PLMN, and filter out the first PLMN.
  • N is an integer greater than or equal to 1
  • the PLMN with the highest priority among the N PLMNs is determined as the first PLMN. That is, when the terminal device detects multiple PLMNs, it can first select the top N PLMNs with the best signal quality according to the signal quality of each PLMN in the multiple PLMNs, and then select the top N PLMNs with the best signal quality according to the priority order of the PLMNs. The PLMN with the highest priority is selected as the first PLMN.
  • the terminal device obtains the first parameter of each PLMN in the at least two PLMNs, where the first parameter includes: signal quality and priority, according to the information of each PLMN in the at least two PLMNs
  • the first parameter namely signal quality and priority, selects the first PLMN from the above at least two PLMNs.
  • the terminal device performs the PLMN selection, the priority of the PLMN and the signal quality of the PLMN are considered at the same time, so that the signal quality of the first PLMN selected finally meets the requirements and has a higher priority, which effectively improves the user connection.
  • the stability of the incoming network avoids the problem of repeated disconnection of users and improves the user experience.
  • FIG. 4 is an interactive schematic diagram of Embodiment 2 of the method for selecting a network provided by the embodiment of the present application.
  • the method is explained by the information exchange between the network device and the terminal device.
  • the method for selecting a network may further include the following steps:
  • the network device configures or updates the signal quality threshold of each of the at least two PLMNs for the terminal device.
  • the network equipment may configure or update the signals of at least two PLMNs in advance for the terminal equipment it serves.
  • the quality threshold so that the terminal device can simultaneously consider the priority and signal quality of each of the at least two PLMNs detected above when performing PLMN selection.
  • each network device for example, a base station
  • the system information includes one or more access points that the base station can access.
  • the network device in the HPLMN can first configure or update the user profile (profile) in the USIM card or SIM card when producing the USIM card or SIM card , adding or updating the signal quality threshold of each available PLMN in the user profile (profile) in the USIM card or SIM card.
  • the user profile (profile) may be an HPLMN selector file with an access technology or an operator-controlled PLMN selector file with an access technology, or other types of files related to PLMN selectors. The embodiment does not limit it.
  • a network device may add a signal quality threshold of each PLMN to a parameter in the non-access stratum signaling, so as to configure or update the signal of each PLMN for the terminal device
  • the purpose of the mass threshold may be a Steering of roaming transparent container (Steering of roaming transparent container) parameter, that is, in the prior art, the network device may update the USIM card or For the profile in the SIM card, in this embodiment of the present application, the signal quality threshold of each PLMN can also be added to the Steering of roaming transparent container parameter for the terminal device to configure or update the signal of each PLMN in at least two PLMNs. quality threshold.
  • the network device may also add the signal quality threshold of the PLMN to which it belongs in the system message, and then implement the system message as the terminal device by broadcasting the system message.
  • the purpose of configuring or updating the signal quality threshold for each PLMN may be performed by the network device.
  • the embodiments of the present application are not limited to the manner in which the terminal device configures the signal quality threshold of the PLMN, which can be selected according to the actual situation, which will not be repeated here.
  • the network device sends the signal quality threshold of each of the at least two PLMNs to the terminal device.
  • the network device configures or updates the signal quality thresholds of at least two PLMNs for the terminal device in different ways, it needs to send them to the terminal device in a corresponding way.
  • the network device when configuring or updating the signal quality threshold of each PLMN for the terminal device by increasing the signal quality threshold of each PLMN in the non-access stratum signaling, the network device (optionally, the UDM The network element) sends the signal quality threshold of each of the at least two PLMNs to the terminal device through non-access stratum signaling.
  • the terminal device can obtain the signal quality thresholds of at least two PLMNs by analyzing the received non-access stratum signaling.
  • the terminal device may write the signal quality threshold of each PLMN into the user profile in the USIM or SIM, or update each PLMN in the user profile in the USIM or SIM signal quality threshold.
  • the terminal device may store the acquired signal quality threshold of each PLMN in the storage space of the terminal device for subsequent use.
  • the network device when configuring or updating the signal quality threshold of the PLMN for the terminal device by adding the signal quality threshold of the PLMN in the system message of the base station , the network device (optionally, the base station) broadcasts the signal quality threshold of the PLMN to the terminal device through a system message.
  • the terminal device can parse the received system message to determine the signal quality threshold corresponding to the PLMN.
  • the network device can only send the signal quality threshold of the PLMN to which it belongs to the terminal device.
  • the terminal device In order for the terminal device to obtain the signal quality threshold of each PLMN of at least two PLMNs, it needs to communicate with the received at least one system. The message is parsed to determine.
  • the signal quality threshold includes at least one of the following:
  • the signal quality threshold corresponding to the PLMN and the signal quality threshold corresponding to the radio access technology used by the PLMN are the same parameters as the PLMN and the signal quality threshold corresponding to the radio access technology used by the PLMN.
  • PLMN may refer to the networks of different operators, and the signal quality threshold corresponding to the PLMN refers to the minimum signal quality of the PLMN when the terminal device is allowed to select;
  • the wireless access technology used by the PLMN may be 2G, 3G, Any one of 4G or 5G, therefore, the signal quality threshold corresponding to the radio access technology used by the PLMN refers to the minimum signal quality of the radio access technology used by the PLMN when the terminal device is allowed to choose.
  • the signal quality thresholds corresponding to different PLMNs, the signal quality thresholds corresponding to the same radio access technology used by different PLMNs, and the signal quality thresholds corresponding to different radio access technologies used by the same PLMN may be the same. , may be different, and it is determined according to the minimum value that can be received by the corresponding operator, which will not be repeated here.
  • the above-mentioned first parameter may further include: a signal quality threshold, that is, before the above-mentioned S302, the method for selecting a network may further include the following steps:
  • the terminal device acquires the signal quality threshold of each of the at least two PLMNs.
  • the terminal device can obtain the signal quality threshold value of each PLMN by analyzing the received information. .
  • the signal quality threshold is derived from the user profile in the global subscriber identity card.
  • Table 3 is a structure of the user configuration file in the USIM card in the embodiment of the present application.
  • the signal strength of the PLMN is further configured behind each PLMN, that is, the signal quality threshold of the PLMN.
  • the signal strength of the first PLMN is configured behind the first PLMN, that is, the signal quality threshold of the first PLMN
  • the signal strength of the second PLMN is configured behind the second PLMN, which is the second PLMN.
  • the signal quality threshold of the nth PLMN, etc.; correspondingly, the signal strength of the nth PLMN is configured behind the nth PLMN, that is, the signal quality threshold of the nth PLMN.
  • Table 3 A structure of the user configuration file in the USIM card in the embodiment of the present application
  • each PLMN occupies 3 bytes, which is a fixed byte length considering the format of the PLMN ID, and the signal strength corresponding to each newly added PLMN usually occupies 2 bytes. Published standard, new fields may be used. Correspondingly, the size of the file may also change, and the meaning represented by each byte may change, which can be determined according to subsequent standards, which will not be repeated here.
  • Table 4 is another structure of the user configuration file in the USIM card in this embodiment of the present application.
  • the radio access technology identifier used by each PLMN is also configured with the signal strength of the radio access technology identifier used by the PLMN, that is, the PLMN Signal quality threshold for the radio access technology used.
  • the radio access technology identifier used by the first PLMN is configured with the signal strength of the radio access technology identifier used by the first PLMN, that is, the signal quality of the radio access technology used by the first PLMN.
  • the signal strength of the radio access technology used by the second PLMN is configured behind the radio access technology identifier used by the second PLMN, that is, the signal strength of the radio access technology used by the second PLMN Quality threshold, etc.; correspondingly, the radio access technology identifier used by the nth PLMN is configured with the signal strength of the radio access technology identifier used by the nth PLMN, that is, the radio access technology used by the nth PLMN.
  • the signal quality threshold for the access technology is configured behind the radio access technology identifier used by the second PLMN, that is, the signal strength of the radio access technology used by the second PLMN Quality threshold, etc.
  • the signal strength of the radio access technology used by each PLMN is the same as that of the PLMN.
  • the identification of the radio access technology used can be combined to occupy a length of 2 bytes.
  • new fields may be used, and accordingly, the size of the file may also change, and the meaning of each byte may change, which can be determined according to subsequent standards, It is not repeated here.
  • Table 5 is still another structure of the user configuration file in the USIM card in this embodiment of the present application.
  • the signal strength of the PLMN that is, the signal quality threshold of the PLMN
  • the radio access used by each PLMN is The back of the technology identifier is also configured with the signal strength of the radio access technology identifier used by the PLMN (that is, the signal quality threshold of the radio access technology used by the PLMN).
  • the back of the first PLMN is configured with the signal strength of the first PLMN
  • the back of the radio access technology identifier used by the first PLMN is configured with the signal strength of the radio access technology identifier used by the first PLMN
  • the signal strength of the nth PLMN is configured behind the nth PLMN
  • the signal of the radio access technology identifier used by the nth PLMN is configured behind the radio access technology identifier used by the nth PLMN. strength.
  • the identity of the first PLMN and the identity of the second PLMN may be the same, The radio access technology used by the first PLMN is different from the radio access technology used by the second PLMN.
  • the identity of the first PLMN and the identity of the second PLMN are different, and The radio access technology used by the first PLMN and the radio access technology used by the second PLMN may be the same, which is not limited in this embodiment.
  • the user profile is an HPLMN selector file with an access technology for explanation.
  • the user profile may also be an operator-controlled PLMN selector file with an access technology or other PLMN selector files, in which the signal strength threshold of the PLMN or the radio access technology used by the PLMN is configured. The way of the signal strength threshold is similar and will not be repeated here.
  • the terminal device may include: an access layer and a non-access layer. Therefore, the non-access layer of the terminal device can obtain the signal quality threshold of each PLMN by reading the user profile in the USIM card.
  • the access layer of the terminal device may include from bottom to top: a physical (physical, PHY) layer, a media access control (media access control, MAC) layer, a radio link control (radio link control, RLC) layer, a packet Data convergence protocol (packet data convergence protocol, PDCP) layer, radio resource control (radio resource control, RRC) layer.
  • the non-access layer of the terminal device may include: a non-access mobility management (NAS mobile management, NAS-MM) layer and a non-access session management (NAS session management, NAS-SM) layer.
  • NAS-SM is used to support the session management function between the terminal device and the SMF
  • the NAS-MM is used to support the mobility management function between the terminal device and the AMF.
  • the non-access stratum of the terminal device may send the identity and signal quality threshold of each PLMN in the above at least two PLMNs to the access stratum of the terminal device, so as to access the terminal device.
  • the layer performs the selection of the PLMN.
  • the signal quality threshold of each PLMN may also come from the storage space of the terminal device. That is, when the terminal device detects at least two PLMNs and the signal quality of each of the at least two PLMNs during the PLMN selection process, the terminal device can obtain the signal quality threshold of each PLMN from the internal storage space .
  • the network device when the network device sends the signal quality threshold of each PLMN to the terminal device through non-access stratum signaling, correspondingly, the non-access stratum of the terminal device can obtain each PLMN signal through the non-access stratum signaling.
  • Signal quality threshold for PLMN when the network device sends the signal quality threshold of each PLMN to the terminal device through non-access stratum signaling, correspondingly, the non-access stratum of the terminal device can obtain each PLMN signal through the non-access stratum signaling.
  • Signal quality threshold for PLMN when the network device sends the signal quality threshold of each PLMN to the terminal device through non-access stratum signaling.
  • the signal quality threshold of each PLMN is derived from the system information of the network device.
  • the network device configures and sends the signal quality threshold of the PLMN where the network device is located in the system information
  • the access layer of the terminal device reads the received system message, it can obtain the location where the network device is located. Signal quality threshold for PLMN.
  • the terminal device determines the first PLMN from the at least two PLMNs according to the signal quality, the signal quality threshold and the priority of each of the at least two PLMNs.
  • the terminal device after acquiring the signal quality and the signal quality threshold of each PLMN in the at least two PLMNs, the terminal device can combine the priority of each PLMN, Choose one as the first PLMN.
  • the network device configures or updates the signal quality threshold value of each PLMN in at least two PLMNs for the terminal device, and sends it to the terminal device.
  • the terminal device obtains at least two PLMNs.
  • the first PLMN is determined from the at least two PLMNs according to the signal quality, the signal quality threshold and the priority of each PLMN.
  • the terminal device can determine, according to the signal quality thresholds of at least two PLMNs configured or updated by the network device, combined with the detected signal quality and priority of each PLMN of the at least two PLMNs, that both can satisfy the Signal quality requirements, and the first PLMN with high priority, so that the terminal device has high stability after accessing the first PLMN.
  • FIG. 5 is a schematic flowchart of Embodiment 3 of the method for selecting a network provided by the embodiment of the present application.
  • the method for selecting a network may include the following steps:
  • the access layer of the terminal device detects at least two PLMNs and the signal quality of each PLMN in the at least two PLMNs.
  • the access stratum of the terminal equipment sends the identity and signal quality of each PLMN in the at least two PLMNs to the non-access stratum of the terminal equipment.
  • the non-access stratum of the terminal device acquires the signal quality threshold of each of the at least two PLMNs.
  • the non-access layer of the terminal device sequentially compares the signal quality of each PLMN in the at least two PLMNs with the signal quality threshold according to the priority of the at least two PLMNs from high to low, until the signal is determined The first PLMN whose quality is greater than or equal to the signal quality threshold.
  • the access stratum of the terminal device is used to search for the identity and signal quality of the PLMN in the scene and transmit it to the non-access stratum, and the non-access stratum obtains the signal quality threshold and priority of each PLMN and according to the order of the priority of each PLMN in the at least two PLMNs from high to low, determine the PLMN whose signal quality is greater than or equal to the signal quality threshold and has the highest priority as the first PLMN.
  • the non-access layer can select a PLMN whose signal quality meets the requirements and has a high priority, which ensures the stability of the terminal device after accessing the network to a certain extent.
  • FIG. 6 is a schematic flowchart of Embodiment 4 of the method for selecting a network provided by the embodiment of the present application. As shown in FIG. 6, in the embodiment of the present application, the method for selecting a network may include the following steps:
  • the access layer of the terminal device detects at least two PLMNs and the signal quality of each PLMN in the at least two PLMNs.
  • the access stratum of the terminal equipment sends the identity and signal quality of each PLMN in the at least two PLMNs to the non-access stratum of the terminal equipment.
  • the non-access stratum of the terminal device acquires the signal quality threshold of each of the at least two PLMNs.
  • the non-access layer of the terminal device determines at least one candidate PLMN whose signal quality is greater than or equal to the signal quality threshold according to the signal quality and the signal quality threshold of each of the at least two PLMNs.
  • the non-access stratum selects the PLMN with the highest priority among the at least two candidate PLMNs as the first PLMN according to the priority of each candidate PLMN in the at least one candidate PLMN.
  • the non-access stratum of the terminal device after the non-access stratum of the terminal device obtains the identity and signal quality of each PLMN of at least two PLMNs from the access stratum, it combines the signals of each PLMN obtained by itself with the signal quality of each PLMN.
  • the PLMN that is, the access layer, according to the signal quality of each PLMN and the signal quality threshold value, takes the PLMN with the signal quality greater than or equal to the signal quality threshold value and the highest priority among at least two PLMNs as the first PLMN.
  • the non-access layer of the terminal device can also select a PLMN whose signal quality meets the requirements and has a high priority, which can also ensure the stability of the terminal device after accessing the network to a certain extent.
  • FIG. 7 is a schematic flowchart of Embodiment 5 of the method for selecting a network provided by the embodiment of the present application. As shown in FIG. 7 , in this embodiment of the present application, the method for selecting a network may include the following steps:
  • the access layer of the terminal device detects at least two PLMNs and the signal quality of each PLMN in the at least two PLMNs.
  • the non-access stratum of the terminal device acquires the signal quality threshold of each of the at least two PLMNs.
  • the non-access stratum of the terminal device sends the identity of each PLMN and the signal quality threshold of the at least two PLMNs to the access stratum.
  • the access layer of the terminal device determines at least one candidate PLMN whose signal quality is greater than or equal to the signal quality threshold according to the received signal quality and signal quality threshold of each of the at least two PLMNs.
  • the access stratum of the terminal device sends the identifier of each candidate PLMN in the at least one candidate PLMN to the non-access stratum.
  • the non-access stratum of the terminal device determines the PLMN with the highest priority as the first PLMN according to the priority of each candidate PLMN in the at least one candidate PLMN.
  • the non-access stratum of the terminal device sends the acquired signal quality threshold of each PLMN to the access stratum, and the access stratum detects the signal quality threshold of each PLMN in the detected At least one candidate PLMN whose signal quality is greater than or equal to the signal quality threshold is determined from at least two PLMNs, and then the non-access layer determines the PLMN with the highest priority among the at least one candidate PLMN according to the priority of the at least one candidate PLMN. is the first PLMN.
  • the non-access layer can also select a PLMN whose signal quality meets the requirements and has a high priority, which ensures the stability of the terminal device after accessing the network to a certain extent.
  • a design solution may be: the non-access stratum reads the user profile in the USIM card by reading the Another design solution may be: the non-access stratum obtains the signal quality threshold value of each PLMN sent by the network device (UDM) through the non-access stratum signaling; another design solution may be that the The internal storage space of the terminal device reads the pre-stored signal quality threshold of each PLMN.
  • This embodiment of the present application does not limit the manner in which the non-access stratum obtains the signal quality threshold of each PLMN, which can be determined according to an actual scenario, which will not be repeated here.
  • FIG. 8 is a schematic flowchart of Embodiment 6 of the method for selecting a network provided by the embodiment of the present application. As shown in FIG. 8 , in this embodiment of the present application, the method for selecting a network may include the following steps:
  • the access layer of the terminal device detects at least two PLMNs and the signal quality of each PLMN in the at least two PLMNs.
  • the access layer of the terminal device acquires the signal quality threshold of each of the at least two PLMNs.
  • the access layer usually obtains the signal quality critical value of each PLMN configured by the base station by reading system messages.
  • the access layer of the terminal device determines at least one candidate PLMN whose signal quality is greater than or equal to the signal quality threshold according to the signal quality and the signal quality threshold of each of the at least two PLMNs.
  • the access stratum of the terminal device sends the identifier of each candidate PLMN in the at least one candidate PLMN to the non-access stratum.
  • the non-access stratum of the terminal device determines the PLMN with the highest priority as the first PLMN according to the priority of each candidate PLMN in the at least one candidate PLMN.
  • the non-access stratum of the terminal device can directly determine the candidate PLMN as the first PLMN without making a judgment based on the priority.
  • the access layer of the terminal device can obtain not only the signal quality threshold of each PLMN, but also the detected at least two PLMNs and the signal quality of each PLMN in the at least two PLMNs. , at this time, the access layer can determine at least one candidate PLMN whose signal quality is greater than or equal to the signal quality threshold among the at least two PLMNs detected according to the signal quality threshold of each PLMN, and then send it to the non-access PLMN. layer, the non-access layer determines the first PLMN with the highest priority among at least one candidate PLMN according to the priority of the candidate PLMNs. In this solution, the non-access layer can also select a PLMN whose signal quality meets the requirements and has a high priority, which ensures the stability of the terminal device after accessing the network to a certain extent.
  • FIG. 9 is a schematic structural diagram of Embodiment 1 of an apparatus for selecting a network provided by the present application.
  • the device can be integrated in the terminal equipment, and can also be realized through the terminal equipment.
  • the means for selecting a network may include:
  • an obtaining module 901 configured to obtain a first parameter of each PLMN in at least two public land mobile network PLMNs, where the first parameter includes: signal quality and priority;
  • the processing module 902 is configured to select a first PLMN from the at least two PLMNs according to the first parameter of each of the at least two PLMNs.
  • the first parameter further includes: a signal quality threshold
  • the processing module 902 is specifically configured to determine the first PLMN from the at least two PLMNs according to the signal quality, signal quality threshold and priority of each of the at least two PLMNs .
  • the signal quality threshold comes from a user profile in the global subscriber identity card.
  • processing module 902 is specifically configured to:
  • the non-access layer of the apparatus sequentially compares the signal quality of each of the at least two PLMNs with the signal quality threshold in the order of the priorities of the at least two PLMNs from high to low, until The first PLMN whose signal quality is greater than or equal to a signal quality threshold is determined.
  • processing module 902 is specifically configured to:
  • the signal quality in the at least two PLMNs is greater than or equal to the signal quality threshold and the priority is the highest PLMN as the first PLMN.
  • the processing module 902 is further configured to send, through the non-access stratum of the device, the identity of each PLMN and the signal quality threshold of the at least two PLMNs to the access layer of the device Floor.
  • the obtaining module 901 is further configured to obtain the information of each of the at least two PLMNs through the non-access stratum signaling by using the non-access stratum of the apparatus. Signal quality threshold.
  • the signal quality threshold comes from system information of the network device.
  • processing module 902 is specifically used for:
  • the non-access layer of the apparatus determines, according to the priority of each candidate PLMN in the at least one candidate PLMN, the PLMN with the highest priority as the first PLMN.
  • the signal quality threshold includes at least one of the following:
  • the signal quality threshold corresponding to the PLMN and the signal quality threshold corresponding to the radio access technology used by the PLMN are the same parameters as the PLMN and the signal quality threshold corresponding to the radio access technology used by the PLMN.
  • processing module 902 is specifically configured to:
  • each PLMN in the at least two PLMNs sort the at least two PLMNs in order of signal quality from high to low, and filter out the top N PLMNs, where N is greater than or an integer equal to 1;
  • the PLMN with the highest priority among the N PLMNs is determined as the first PLMN.
  • the apparatus for selecting a network provided in this embodiment is used to execute the technical solutions on the terminal device side in the foregoing method embodiments, and its implementation principles and technical effects are similar, and details are not described herein again.
  • FIG. 10 is a schematic structural diagram of Embodiment 2 of an apparatus for selecting a network provided by the present application.
  • the device can be integrated in a network device or implemented through a network device.
  • the means for selecting a network may include:
  • a processing module 1001, configured to configure or update the signal quality threshold of each PLMN in the at least two PLMNs for the terminal device;
  • a sending module 1002 configured to send the signal quality threshold of each of the at least two PLMNs to the terminal device.
  • the sending module 1002 is specifically configured to send the signal quality threshold of each of the at least two PLMNs to the terminal through non-access stratum signaling equipment.
  • the processing module 1001 is specifically configured to, for each of the at least two PLMNs, add the signal quality threshold of the PLMN in the system message of the base station ;
  • the sending module 1002 is specifically configured to send and broadcast the signal quality threshold of each of the at least two PLMNs to the terminal device through the system message.
  • the apparatus for selecting a network provided in this embodiment is used to execute the technical solutions on the network device side in the foregoing method embodiments, and its implementation principles and technical effects are similar, and details are not described herein again.
  • FIG. 11 is a schematic structural diagram of an embodiment of a terminal device provided in this application.
  • the terminal device may include: a processor 1101, a memory 1102, a receiver 1103, and an interface 1104 for communicating with a network device.
  • the memory 1102 stores computer-executed instructions
  • the processor 1101 executes the computer-executed instructions stored in the memory 1102, so that the processor 1101 executes the technical solutions on the terminal device side as in the foregoing method embodiments.
  • FIG. 12 is a schematic structural diagram of a network device provided by this application.
  • the network device may include: a processor 1201, a memory 1202, a transmitter 1203, and an interface 1204 for communicating with the terminal device.
  • the memory 1202 stores computer execution instructions
  • the processor 1201 executes the computer-executed instructions stored in the memory 1202, so that the processor 1201 executes the technical solutions on the network device side in the foregoing method embodiments.
  • an embodiment of the present application may further provide a communication system, and the communication system may include: a terminal device and a network device.
  • the terminal device may include the apparatus for selecting a network described in FIG. 9 or the terminal device described in FIG. 11 , and the terminal device is used to implement the technical solutions of the terminal device in the foregoing method embodiments.
  • the network device may include the apparatus for selecting a network described in FIG. 10 or the network device described in FIG. 12 , and the network device is used to implement the technical solutions of the network device in the foregoing method embodiments.
  • the communication system may further include other devices, which may be determined according to actual scenarios, and details are not described herein again.
  • the present application also provides a computer-readable storage medium, where computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, are used to implement the technical solutions on the terminal device side in the foregoing method embodiments.
  • the present application further provides a computer-readable storage medium, where computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, are used to implement the technical solutions on the network device side in the foregoing method embodiments.
  • the embodiments of the present application further provide a program, which is used to execute the technical solutions on the terminal device side in the foregoing method embodiments when the program is executed by the processor.
  • the embodiments of the present application further provide a program, which, when the program is executed by the processor, is used to execute the technical solutions on the network device side in the foregoing method embodiments.
  • Embodiments of the present application further provide a computer program product, including a computer program, which is used to implement the technical solutions on the terminal device side in the foregoing method embodiments when the computer program is executed by a processor.
  • Embodiments of the present application further provide a computer program product, including a computer program, which is used to implement the technical solutions on the network device side in the foregoing method embodiments when the computer program is executed by a processor.
  • Embodiments of the present application further provide a chip, including: a processing module and a communication interface, where the processing module can execute the technical solutions on the terminal device side in the foregoing method embodiments.
  • the chip also includes a storage module (eg, memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to execute the above method implementation.
  • a storage module eg, memory
  • the storage module is used for storing instructions
  • the processing module is used for executing the instructions stored in the storage module
  • the execution of the instructions stored in the storage module causes the processing module to execute the above method implementation.
  • Embodiments of the present application further provide a chip, including: a processing module and a communication interface, where the processing module can execute the technical solutions on the network device side in the foregoing method embodiments.
  • the chip also includes a storage module (eg, memory), the storage module is used for storing instructions, the processing module is used for executing the instructions stored in the storage module, and the execution of the instructions stored in the storage module causes the processing module to execute the above method implementation.
  • a storage module eg, memory
  • the storage module is used for storing instructions
  • the processing module is used for executing the instructions stored in the storage module
  • the execution of the instructions stored in the storage module causes the processing module to execute the above method implementation.
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the device embodiments described above are only illustrative.
  • the division of units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or integrated. to 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 processor may be a central processing unit (English: Central Processing Unit, referred to as: CPU), or other general-purpose processors, digital signal processors (English: Digital Signal Processor, referred to as: DSP), application specific integrated circuit (English: Application Specific Integrated Circuit, referred to as: ASIC) and so on.
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps in combination with the method disclosed in the present application can be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the aforementioned program can be stored in a readable memory.
  • the steps including the above method embodiments are executed; and the aforementioned memory (storage medium) includes: read-only memory (English: read-only memory, abbreviated as: ROM), RAM, flash memory, hard disk, Solid state drive, magnetic tape (English: magnetic tape), floppy disk (English: floppy disk), optical disc (English: optical disc) and any combination thereof.

Abstract

本申请实施例提供一种选择网络的方法、装置、设备及存储介质，终端设备通过获取至少两个公共陆地移动网PLMN中每个PLMN的第一参数，该第一参数包括：信号质量和优先级，根据上述至少两个PLMN中每个PLMN的第一参数，从上述至少两个PLMN中选择第一PLMN。该技术方案中，终端设备在执行PLMN选择时，同时考虑PLMN的优先级和PLMN的信号质量，能够使得最终选择的第一PLMN信号质量满足要求且具有较高的优先级，有效避免了用户接入的网络不稳定、用户重复掉线的问题，提高了用户体验。

Description

选择网络的方法、装置、设备及存储介质 技术领域
本申请实施例涉及通信技术领域，尤其涉及一种选择网络的方法、装置、设备及存储介质。
背景技术
随着无线通信技术已经深入的人们的生活，用户的终端设备在刚开机或进入空闲态后需要执行公共陆地移动网(public land mobile network，PLMN)的选择，并在接入所选择的PLMN后，利用该PLMN网络提供的服务。
现有技术中，终端设备执行PLMN选择时，该终端设备的接入层读取周围小区的系统信息，从系统信息中获取到周围小区所属的PLMN ID后，会把这些PLMN ID都上报给非接入层(non access stratum，NAS)层，以便NAS层根据PLMN的优先级，从中选择最终的PLMN。
然而，由于终端设备仅基于PLMN的优先级选择最终接入的网络，当接入PLMN的网络质量较差时，可能存在网络不稳定、用户重复掉线的问题，导致用户体验差。
发明内容
本申请实施例提供一种选择网络的方法、装置、设备及存储介质，用于解决现有PLMN选择方法中存在的由于网络不稳定、用户重复掉线，导致的用户体验差的问题。
第一方面，本申请实施例可提供一种选择网络的方法，包括：
终端设备获取至少两个公共陆地移动网PLMN中每个PLMN的第一参数，所述第一参数包括：信号质量和优先级；
所述终端设备根据所述至少两个PLMN中每个PLMN的第一参数，从所述至少两个PLMN中选择第一PLMN。
第二方面，本申请实施例可提供一种选择网络的方法，包括：
网络设备为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值；
所述网络设备将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
第三方面，本申请实施例可提供一种选择网络的装置，包括：
获取模块，用于获取至少两个公共陆地移动网PLMN中每个PLMN的第一参数，所述第一参数包括：信号质量和优先级；
处理模块，用于根据所述至少两个PLMN中每个PLMN的第一参数，从所述至少两个PLMN中选择第一PLMN。
第四方面，本申请实施例可提供一种选择网络的装置，包括：
处理模块，用于为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值；
发送模块，用于将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
第五方面，本申请实施例可提供一种终端设备，包括：
处理器、存储器、接收器与网络设备进行通信的接口；
所述存储器存储计算机执行指令；
所述处理器执行所述存储器存储的计算机执行指令，使得所述处理器执行上述第一方面提供的方法。
可选地，上述处理器可以为芯片。
第六方面，本申请实施例可提供一种网络设备，包括：
处理器、存储器、发送器与终端设备进行通信的接口；
所述存储器存储计算机执行指令；
所述处理器执行所述存储器存储的计算机执行指令，使得所述处理器执行上述第二方面提供的方法。
可选地，上述处理器可以为芯片。
第七方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有计算机执行指令，当所述计算机执行指令被处理器执行时用于实现第一方面所述的方法。
第八方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有计算 机执行指令，当所述计算机执行指令被处理器执行时用于实现第二方面所述的方法。
第九方面，本申请实施例提供一种程序，当该程序被处理器执行时，用于执行如第一方面所述的方法。
第十方面，本申请实施例提供一种程序，当该程序被处理器执行时，用于执行如第二方面所述的方法。
第十一方面，本申请实施例提供一种计算机程序产品，包括程序指令，程序指令用于实现如第一方面所述的方法。
第十二方面，本申请实施例提供一种计算机程序产品，包括程序指令，程序指令用于实现如第二方面所述的方法。
第十三方面，本申请实施例提供了一种芯片，包括：处理模块与通信接口，该处理模块能执行第一方面所述的方法。
进一步地，该芯片还包括存储模块(如，存储器)，存储模块用于存储指令，处理模块用于执行存储模块存储的指令，并且对存储模块中存储的指令的执行使得处理模块执行第一方面所述的方法。
第十四方面，本申请实施例提供了一种芯片，包括：处理模块与通信接口，该处理模块能执行第二方面所述的方法。
进一步地，该芯片还包括存储模块(如，存储器)，存储模块用于存储指令，处理模块用于执行存储模块存储的指令，并且对存储模块中存储的指令的执行使得处理模块执行第二方面所述的方法。
本申请第十五方面提供一种通信系统，包括：网络设备和终端设备；
所述终端设备为上述第三方面所述的装置，所述网络设备为上述第四方面所述的装置。
本申请实施例提供了一种选择网络的方法、装置、设备及存储介质，终端设备通过获取至少两个PLMN中每个PLMN的第一参数，该第一参数包括：信号质量和优先级，根据至少两个PLMN中每个PLMN的第一参数，从上述至少两个PLMN中选择第一PLMN。该技术方案中，终端设备在执行PLMN选择时，同时考虑PLMN的优先级和PLMN的信号质量，能够使得最终选择的第一PLMN信号质量满足要求且具有较高的优先级，有效避免了用户接入的网络不稳定、用户重复掉线的问题，提高了用户体验。
附图说明
图1为本申请实施例提供的一种通信系统的结构示意图；
图2为USIM卡中IMSI的结构示意图；
图3为本申请实施例提供的选择网络的方法实施例一的流程示意图；
图4为本申请实施例提供的选择网络的方法实施例二的交互示意图；
图5为本申请实施例提供的选择网络的方法实施例三的流程示意图；
图6为本申请实施例提供的选择网络的方法实施例四的流程示意图；
图7为本申请实施例提供的选择网络的方法实施例五的流程示意图；
图8为本申请实施例提供的选择网络的方法实施例六的流程示意图；
图9为本申请提供的选择网络的装置实施例一的结构示意图；
图10为本申请提供的选择网络的装置实施例二的结构示意图；
图11为本申请提供的终端设备实施例的结构示意图；
图12为本申请提供的网络设备的结构示意图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请实施例的说明书、权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例能够以除了在这里图示或描述之外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
在介绍本申请的技术方案之前，首先对本申请实施例所涉及的名词进行解释：
公共陆地移动网(public land mobile network，PLMN)
PLMN是由政府或它所批准的经营者，为公众提供陆地移动通信业务目的而建立和经营的网络，该网路通常与公众交换电话网(public switched telephone network，PSTN)互连，形成整个地区或国家规模的通信网。
在实际应用中，为了让用户搞清楚所处的PLMN，每个PLMN都应该有明确的标识(编号)，并作为系统信息由基站来广播，让基站下的终端设备都能够接收到。
目前，PLMN通常由移动国家码(mobile country codes，MCC)和移动网络码(mobile network codes，MNC)组成，即，PLMN＝MCC+MNC。由于每个移动通信运营商的网络算是一个PLMN，因此，不同运营商的网络是不同的PLMN。随着虚拟运营商的兴起，虚拟运营商也可以算成是一个PLMN。
对于一个特定的终端设备，通常需要维护和/或保存几种不同类型的PLMN表，每个PLMN表中会有多个PLMN。示例性的，每个PLMN表包括的多个PLMN可以如下：
已登记PLMN(registered PLMN，RPLMN)：终端设备在上次关机或脱网前登记的PLMN；
等效PLMN(equivalent PLMN，EPLMN)：与终端设备当前所选择的PLMN处于同等地位的PLMN，其优先级相同。
等效归属PLMN(equivalent home PLMN，EHPLMN)：与终端设备当前所选择的PLMN处于同等地位的归属PLMN；
归属PLMN(home PLMN，HPLMN)：终端用户归属的PLMN；终端设备中全球用户识别(universal subscriber identity module，USIM)卡上国际移动用户识别码(international mobile subscriber identity，IMSI)号中包含的MCC和MNC与HPLMN上的MCC和MNC是一致的；
访问PLMN(visited PLMN，VPLMN)：终端用户访问的PLMN。该PLMN与终端设备中USIM卡上IMSI中的MCC、MNC不完全相同；
用户控制PLMN(user controlled PLMN，UPLMN)：储存在USIM卡上的一个与PLMN选择有关的参数；
运营商控制PLMN(operator controlled PLMN，OPLMN)：储存在USIM卡上的一个与PLMN选择有关的参数；
禁用PLMN(forbidden PLMN，FPLMN)：被禁止访问的PLMN，通常终端设备在尝试接入某个PLMN被拒绝以后，会将其加到本列表中；
可捕获PLMN(approve PLMN，APLMN)：终端能在该APLMN上找到至少一个小区，并能读出其PLMN标识信息的PLMN。
可以理解的是，不同类型的PLMN其优先级别不同，终端设备在进行PLMN选择时，将按照以下顺序依次进行：RPLMN、EPLMN、HPLMN、EHPLMN、UPLMN、OPLMN、其他的PLMN。
下述在介绍本申请的背景技术和技术方案之前，首先对本申请所适用的通信系统进行介绍。
示例性的，图1为本申请实施例提供的一种通信系统的结构示意图。如图1所示，该通信系统可以包括至少一个终端设备和至少两个网络设备。图1以示出一个终端设备11和两个网络设备(第一网络设备12和第二网络设备13)，即以终端设备11位于两个网络的覆盖范围内进行解释说明。
在图1所示实施例的通信系统中，假设第一网络设备12为第一PLMN中的网络设备，第二网络设备13为第二PLMN中的网络设备，本实施例中，以第一PLMN的覆盖范围内包括第一网络设备12，第二PLMN的覆盖范围内包括第二网络设备13进行解释说明，此处不对第一PLMN和第二PLMN覆盖的设备数量进行限定。
示例性的，假设终端设备11同时处于第一PLMN和第二PLMN的覆盖范围内，这时，终端设备11在开机或重启或进入空闲态时，需要重新选择PLMN，例如，可以根据第一PLMN的优先级和信号质量、第二PLMN的优先级和信号质量从第一PLMN和第二PLMN中确定出最终选择的PLMN。
可选的，在本申请的实施例中，每个网络设备所在的网络可以包括：非3GPP接入的互通网元(non-3GPP interworking function，N3IWF)，接入及移动性管理(access and mobility management function，AMF)、会话管理功能(session management function，SMF)、用户面功能网元(user plane function，UPF)等功能网元。本申请实施例中的第一网络设备和第二网络设备的体现形式可以为其所在网络的任意一个网元。其中，AMF主要是接入和移动管理功能，UPF主要用于接收控制信令，以及处理用户面数据等功能。
示例性的，每个网络设备所在的网络不限于包括N3iwf、AMF、SMF、UPF，其还可以包括：认证服务器功能网元(authentication server function，AUSF)、统一的数据管理(unified data management，UDM)、认证信任状存储和处理功能(authentication credential repository and processing function，ARPF) 等其他的网元，本申请实施例不限于此。其中，AUSF主要用于执行与认证相关的操作；UDM用于执行用户数据的管理等功能；ARPF主要用于执行用户的身份、密钥和签约数据等的存储以及处理等。
可选地，该通信系统还可以包括更多的网络设备，并且每个网络设备的覆盖范围内可以包括其它数量的终端设备，本申请实施例对该通信系统中包括的网络设备和终端设备的数量不做限定。
如图1所示，终端设备11通过无线的方式与第一网络设备12或第二网络设备13相连。例如，终端设备11和多个网络设备之间可以使用非授权频谱进行无线通信。可选地，在通信系统包括多个终端设备时，终端设备之间可以进行终端直连(device to device，D2D)通信。
可以理解的是，图1只是通信系统的一种示意图，该通信系统中还可以包括其它网络设备，例如，核心网设备、无线中继设备和无线回传设备，或者可以包括网络控制器、移动管理实体等其他网络实体，本申请实施例不限于此。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)系统、先进的长期演进(advanced long term evolution，LTE-A)系统、新无线(new radio，NR)系统、NR系统的演进系统、非授权频段上的LTE(LTE-based access to unlicensed spectrum，LTE-U)系统、非授权频段上的NR(NR-based access to unlicensed spectrum，NR-U)系统、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、无线局域网(wireless local area networks，WLAN)、无线保真(wireless fidelity，WiFi)、下一代通信系统或其他通信系统等。
通常来说，传统的通信系统支持的连接数有限，也易于实现，然而，随着通信技术的发展，移动通信系统将不仅支持传统的通信，还将支持例如，设备到设备(device to device，D2D)通信，机器到机器(machine to machine，M2M)通信，机器类型通信(machine type communication，MTC)，以及车辆间(vehicle to vehicle，V2V)通信等，本申请实施例也可以应用于这些通信系统。
本申请实施例描述的系统架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
本申请实施例中涉及的网络设备，可以是普通的基站(如NodeB或eNB或者gNB)、新无线控制器(new radio controller，NR controller)、集中式网元(centralized unit)、新无线基站、射频拉远模块、微基站、中继(relay)、分布式网元(distributed unit)、接收点(transmission reception point，TRP)、传输点(transmission point，TP)或者任何其它设备。本申请的实施例对网络设备所采用的具体技术和具体设备形态不做限定。为方便描述，本申请所有实施例中，上述为终端设备提供无线通信功能的装置统称为网络设备。
在本申请实施例中，终端设备可以是任意的终端，比如，终端设备可以是机器类通信的用户设备。也就是说，该终端设备也可称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal)、终端(terminal)等，该终端设备可以经无线接入网(radio access network，RAN)与一个或多个核心网进行通信，例如，终端设备可以是移动电话(或称为“蜂窝”电话)、具有移动终端的计算机等，例如，终端设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。本申请实施例中不做具体限定。
可选的，网络设备和终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对网络设备和终端设备的应用场景不做限定。
可选的，网络设备和终端设备之间以及终端设备和终端设备之间可以通过授权频谱(licensed spectrum)进行通信，也可以通过免授权频谱(unlicensed spectrum)进行通信，也可以同时通过授权频谱和免授权频谱进行通信。本申请的实施例对网络设备和终端设备之间通信所使用的频谱不做限定。
下面首先介绍一下提出本申请技术方案的背景：
现阶段，终端设备在用户的控制下，可以工作在关机状态、待机状态和联机状态等三种工作模式中的任何一种模式下。其中，终端设备处于关机状态时会与无线网络断开连接，因而，终端设备在开机后，首要任务是搜索网络并注册，即选网操作。终端设备的选网操作可以分为PLMN选择和小区搜索两个过程。
其中，在PLMN选择过程中，终端设备内部的芯片会从USIM卡内读取具有接入技术的HPLMN选择器(HPLMN Selector with Access Technology)、具有接入技术的用户控制PLMN选择器(User  Controlled PLMN Selector with Access Technology)、禁止PLMN(Forbidden PLMNs)、等效HPLMN(Equivalent HPLMN)、具有接入技术的运营商控制PLMN选择器(Operator controlled PLMN Selector with Access Technology)等文件，而且，终端设备中芯片的非接入(NAS)层会触发接入层(AS)读取周围小区的系统信息，从系统信息中获得周围小区所属的PLMN ID，接入层再把这些PLMN ID都上报给NAS层，NAS层从中选择最终的PLMN。
此外，接入层还会将低于质量阈值(例如，-110dB)的PLMN的信号质量也报给NAS层，也就是PLMN ID+信号质量。
通常情况下，终端设备开机先选PLMN网络，然后再选择小区，但由于终端设备开机时不知道自己用的SIM卡或USIM卡是哪个PLMN的，因而，终端设备开机后先对所有频点进行扫描，哪个频点信号最好就选哪个，这时候不管是哪家运营商的，它都监听该频点的频率校正信道(frequency correction channel，FCCH)、同步信道(synchronization channel，SCH)，接着监听广播控制信道(broadcast control channel，BCCH)，BCCH里有基站识别码(base station identity code，BSIC)，BSIC里面的网络色码(network color code，NCC)可以区别该频点是哪家运营商的，要是不合适就选信号次强的频点继续完成上述步骤。
示例性的，终端设备中的NAS层选择PLMN时遵循以下顺序：
1、HPLMN(如果EHPLMN列表不存在或为空)或者最高优先级的EHPLMN(如果EHPLMN列表存在)，其英文表述为：either the HPLMN(if the EHPLMN list is not present or is empty)or the highest priority EHPLMN(equivalent HPLMN)that is available(if the EHPLMN list is present)。
可选的，HPLMN ID从USIM卡的IMSI中可以获得。示例性的，图2为USIM卡中IMSI的结构示意图。IMSI是区别移动用户的标志，储存在USIM卡中，可用于区别移动用户的有效信息。如图2所示，IMSI的总长度不超过15位，使用0～9的数字表示，IMSI包括：MCC、MNC和移动用户识别码(mobile subscriber identification number，MSIN)，其中，MCC是移动用户所属国家代号，占3位数字；MNC是移动网号码，通常占2或3个数字，用于识别移动用户所归属的移动通信网；MSIN用以识别某一移动通信网中的移动用户。
可选的，USIM卡中存在具有接入技术的HPLMN选择器(HPLMN Selector with Access Technology)文件。示例性的，表1为具有接入技术的HPLMN选择器文件的结构。如表1所示，该具有接入技术的HPLMN选择器文件的标识(Identifier)为6F62，结构(Structure)是透明的(Transparent)，存在的状态为可选(Optional)，短基本文件标识(short elementary file identifier，SFI)为13；文件大小(File size)为5n个字节(bytes)，其中，n≥1，更新活跃度(Update activity)为低(low)。
可选的，在表1中，在满足接入条件时，针对基本文件(elementary file，EF)的接入操作分为读(READ)、更新(UPDATE)、去激活(DEACTIVATE)和激活(ACTIVATE)，其中，读取(READ)需要检查个人识别码(personal identification number，PIN)正确，更新(UPDATE)、去激活(DEACTIVATE)和激活(ACTIVATE)需要满足授权(ADM)。
示例性的，参照表1所示，具有接入技术的HPLMN选择器文件中对各字节的描述为：字节1至3用于描述第一个PLMN，在文件中是必选的(Mandatory，M)，长度为3个字节，字节4至5用于描述第一个PLMN接入技术的标识，在文件也是必选的(M)，长度为2字节；字节6至8用于描述第二个PLMN，在文件中是可选的(Optional，O)，长度为3个字节，字节9至10用于描述第二个PLMN接入技术的标识，在文件也是可选的(O)，长度为2字节；依次类推，字节(5n-4)至(5n-2)用于描述第n个PLMN，在文件中是可选的(O)，长度为3个字节，字节(5n-1)至(5n)用于第n个PLMN接入技术的标识，在文件也是可选的(O)，长度为2字节。
表1具有接入技术的HPLMN选择器文件的结构
Figure PCTCN2021082415-appb-000001
Figure PCTCN2021082415-appb-000002
由上表分析可知，HPLMN在文件中排的越靠前，优先级越高。
例如：移动的4G卡，配置LTE优先级高于2G，则终端设备在选择PLMN时会优先选择移动4G网络；而当周围没有4G覆盖时，终端设备会选择移动2G网络。
在实际应用中，由于EHPLMN和HPLMN可以为终端设备提供相同的服务，两者的作用相同，因而，上述表1中的无线接入技术(radio access technology，RAT)的优先级也同样适用于EHPLMN。
2、SIM卡中“具有接入技术的用户控制PLMN选择器”数据文件中的每个PLMN和无线访问技术的组合(基于优先级顺序确定的)，其英文表述为：“each PLMN/access technology combination in the"User Controlled PLMN Selector with Access Technology"data file in the SIM(in priority order)”。
3、SIM卡中“具有接入技术的运营商控制PLMN选择器”数据文件中的每个PLMN和无线访问技术的组合(按优先级顺序确定)，或者，存储在移动设备(mobile equipment，ME)中的每个PLMN和无线访问技术的组合(按优先级顺序确定)，其英文表述为：“each PLMN/access technology combination in the"Operator Controlled PLMN Selector with Access Technology"data file in the SIM(in priority order)or stored in the ME(in priority order)”。
示例性的，表2为具有接入技术的运营商控制PLMN选择器文件的结构。如表2所示，该具有接入技术的运营商控制PLMN选择器文件的标识(Identifier)为6F61，结构(Structure)是透明的(Transparent)，存在的状态为可选(Optional)，SFI为11；文件大小(File size)为5n个字节(bytes)，其中，n≥8，更新活跃度(Update activity)为低(low)。
类似的，如表2所示，在满足接入条件时，针对EF的接入操作同样分为读(READ)、更新(UPDATE)、去激活(DEACTIVATE)和激活(ACTIVATE)，其中，读取(READ)需要检查PIN正确，更新(UPDATE)、去激活(DEACTIVATE)和激活(ACTIVATE)需要满足授权(ADM)。
示例性的，参照表2所示，具有接入技术的运营商控制PLMN选择器文件中对各字节的描述为：字节1至3用于描述第一个PLMN(具有最高优先级)，在文件中是必选的(M)，长度为3个字节，字节4至5用于描述第一个PLMN接入技术的标识，在文件也是必选的(M)，长度为2字节；依次类推，字节36至38用于描述第八个PLMN，在文件中是必选的(M)，长度为3个字节，字节39至40用于描述第八个PLMN接入技术的标识，在文件也是必选的(M)，长度为2字节；字节41至43用于描述第九个PLMN，在文件中是可选的(O)，长度为3个字节，字节44至45用于描述第九个PLMN接入技术的标识，在文件也是可选的(O)，长度为2字节；依次类推，字节(5n-4)至(5n-2)用于描述第N个PLMN(具有最低优先级)，在文件中是可选的(O)，长度为3个字节，字节(5n-1)至(5n)用于第N个PLMN接入技术的标识，在文件也是可选的(O)，长度为2字节。
表2具有接入技术的运营商控制PLMN选择器文件的结构
Figure PCTCN2021082415-appb-000003
Figure PCTCN2021082415-appb-000004
由上表分析可知，每个PLMN后面会跟随一个RAT，排的越靠前优先级越高。
4、在随机顺序中具有接收的高质量信号的其他PLMN和无线接入技术组合，其英文表述为：“other PLMN/access technology combinations with received high quality signal in random order”。
5、用于降低信号质量的其他PLMN和无线接入技术组合，其英文表述为：“other PLMN/access technology combinations in order of decreasing signal quality”。
由上述分析可知，目前，终端设备在选择PLMN的顺序时，都会优先考虑PLMN的优先级，只有在通过PLMN的优先级无法确定出合适PLMN时，才会考虑PLMN的信号质量。因而，在现有技术中，终端设备通常仅基于PLMN的优先级选择最终接入的PLMN网络，即使高优先级的PLMN信号质量很差，终端设备也会选择该PLMN，这时可能存在网络不稳定、终端设备重复掉线的问题，导致用户体验差。
针对上述技术问题，本申请技术方案的发明构思过程如下：由于现有技术中终端设备在选择PLMN时，通常仅考虑PLMN的优先级，这可能存在终端设备选择到优先级较高但信号质量较差的PLMN，尤其在漫游场景下较为常见，这可能造成终端设备频繁掉线，造成用户体验差的问题，从而可能出现该PLMN所属运营商收到投诉，所以，PLMN所属运营商有对接入网络的终端设备有控制需求，例如，可以控制终端设备检测到的某些PLMN的信号质量大于或等于信号质量阈值时才允许接入等，针对该控制需要，发明人发现：如果终端设备在选择PLMN之前，同时参照PLMN的信号质量和PLMN的优先级，将质量较差的PLMN剔除掉，这样可以保证选择的PLMN为较高优先级且满足信号质量要求的PLMN，有效避免了终端设备重复掉线的问题，提高了用户体验。
基于上述技术构思过程，本申请实施例提供了一种选择网络的方法，终端设备通过获取至少两个PLMN中每个PLMN的第一参数，该第一参数包括：信号质量和优先级，根据至少两个PLMN中每个PLMN的第一参数，从上述至少两个PLMN中选择第一PLMN。该技术方案中，终端设备在执行PLMN选择时，同时考虑PLMN的优先级和PLMN的信号质量，能够使得最终选择的第一PLMN信号质量满足要求且具有较高的优先级，有效避免了用户接入的网络不稳定、用户重复掉线的问题，提高了用户体验。
基于上述提出的技术方案和技术构思过程，下面通过具体实施例对本申请的技术方案进行详细说明。需要说明的是，本申请的技术方案可以包括以下内容中的部分或全部，下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例中不再赘述。
图3为本申请实施例提供的选择网络的方法实施例一的流程示意图。如图3所示，该选择网络的方法可以包括如下步骤：
S301、终端设备获取至少两个PLMN中每个PLMN的第一参数，该第一参数包括：信号质量和优先级。
在本申请的实施例中，由于终端设备在开机或重启或进入空闲态时，会执行PLMN的选择。具体的，终端设备首先搜索或检测所在场景中存在的PLMN，通常情况下，同一个场景中会存在多个PLMN，本申请实施例以存在至少两个PLMN进行解释说明。
示例性的，终端设备通过检测PLMN覆盖范围内是否存在网络设备发送信号来确定存在的至少两个PLMN，因而，终端设备在检测到至少两个PLMN的同时，还能够获取到至少两个PLMN中每个PLMN的信号质量。
可选的，每个PLMN的信号质量通常是终端设备检测到的信号质量，即终端设备根据接收到的系统消息的信号质量而确定的。示例性的，PLMN的信号质量可以是终端设备接收到参考信号接收功率(reference signal receiving power，RSRP)的大小，也可以是其他信号的功率大小，本申请实施例并不对其进行限定。
S302、终端设备根据上述至少两个PLMN中每个PLMN的第一参数，从上述至少两个PLMN中选择第一PLMN。
示例性的，在第一参数包括：信号质量和优先级，且终端设备获取到上述至少两个PLMN中每个PLMN的信号质量时，便可以查询终端设备中预置的PLMN列表，确定出每个PLMN的优先级，进而在已知每个PLMN的优先级的基础上，再结合每个PLMN的信号质量，从检测到的上述至少两个PLMN中最终选择一个PLMN，在本申请的实施例中，将最终选择的PLMN称为第一PLMN，本申请实施例并不对第一PLMN的具体实现进行限定。
可选的，在本申请的一种实施例中，终端设备中的具有接入技术的HPLMN选择器文件或者具有接入技术的运营商控制PLMN选择器文件等用户配置文件中可以预置有预先被写入的每个PLMN的 信号质量临界值，该信号质量临界值可以理解为允许终端设备选择的最低信号质量。
因而，当终端设备确定某个PLMN的信号质量低于该PLMN的信号质量临界值时，通常情况下，可以将其舍弃，不选择。也即，终端设备从上述至少两个PLMN中选择的第一PLMN可以满足如下条件：第一PLMN的信号质量大于或等于第一PLMN的信号质量临界值，且，第一PLMN的优先级在上述至少两个PLMN中的优先级较高。
可选的，在本申请的另一种实施例中，终端设备还可以根据每个PLMN的信号质量，按照信号质量由高到低的顺序对上述至少两个PLMN进行排序，筛选出排序在前的N个PLMN，其中，N为大于或等于1的整数，然后将N个PLMN中优先级最高的PLMN，确定为第一PLMN。也即，当终端设备检测到多个PLMN时，其可以首先根据多个PLMN中每个PLMN的信号质量从中选出信号质量最好的前N个PLMN，然后再按照PLMN的优先级顺序，从中选择优先级最高的PLMN作为第一PLMN。
可以理解的是，本申请实施例上述给出了确定第一PLMN的两种示例，在实际应用中，还可以能有其他的形式，其可以根据实际场景或设定选择，此处不作赘述。
本申请实施例提供的选择网络的方法，终端设备通过获取至少两个PLMN中每个PLMN的第一参数，该第一参数包括：信号质量和优先级，根据至少两个PLMN中每个PLMN的第一参数，即信号质量和优先级，从上述至少两个PLMN中选择第一PLMN。该技术方案中，终端设备在执行PLMN选择时，同时考虑PLMN的优先级和PLMN的信号质量，能够使得最终选择的第一PLMN信号质量满足要求且具有较高的优先级，有效提高了用户接入的网络的稳定性，避免了用户重复掉线的问题，提高了用户体验。
示例性的，在上述实施例的基础上，图4为本申请实施例提供的选择网络的方法实施例二的交互示意图。该方法以网络设备和终端设备之间的信息交互进行解释说明。如图4所示，在本申请的实施例中，该选择网络的方法还可以包括如下步骤：
S401、网络设备为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值。
示例性的，在实际应用中，为了保证终端设备在后续执行PLMN选择时，能够有效避开信号质量较差的PLMN，网络设备可以事先为其服务的终端设备配置或更新至少两个PLMN的信号质量临界值，以便终端设备在执行PLMN选择时，能够同时考虑上述检测到的至少两个PLMN中每个PLMN的优先级和信号质量。
可选的，在实际应用中，每个网络设备(例如，基站)大概率只属于一个PLMN，也可以多个PLMN共用一个基站，系统信息中包含的是该基站可以接入的一个或多个PLMN ID和多个PLMN中每个PLMN对应的临界值。
作为一种示例，针对给定的PLMN，例如，HPLMN，该HPLMN内的网络设备可以在生产USIM卡或SIM卡时，首先通过配置或更新USIM卡或SIM卡中用户配置文件(profile)的方式，在USIM卡或SIM卡中的用户配置文件(profile)中增加或更新每个可用PLMN的信号质量临界值。示例性的，该用户配置文件(profile)可以是具有接入技术的HPLMN选择器文件或者具有接入技术的运营商控制PLMN选择器文件，或者为其他类型与PLMN选择器有关的文件，本申请实施例对其不作限定。
作为另一种示例，网络设备(例如，UDM网元)可以在非接入层信令中的参数中增加每个PLMN的信号质量临界值，进而实现为终端设备配置或更新每个PLMN的信号质量临界值的目的。示例性的，非接入层信令中的参数可以是漫游透明容器指导(Steering of roaming transparent container)参数，即，现有技术中网络设备可以通过该Steering of roaming transparent container参数来更新USIM卡或SIM卡中的profile，本申请实施例中，也可以在该Steering of roaming transparent container参数中添加每个PLMN的信号质量临界值的方式为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值。
作为再一种示例，在网络设备和终端设备的通信过程中，网络设备(例如，基站)还可以在系统消息中增加所属PLMN的信号质量临界值，进而通过广播系统消息的方式实现为终端设备配置或更新每个PLMN的信号质量临界值的目的。
可理解，本申请实施例并不限定为终端设备配置PLMN的信号质量临界值的方式，其可以根据实际情况选择，此处不作赘述。
S402、网络设备将上述至少两个PLMN中每个PLMN的信号质量临界值发送给上述终端设备。
在本申请的实施例中，网络设备通过不同方式为终端设备配置或更新至少两个PLMN的信号质量临界值后，便需要通过对应的方式将其发送给终端设备。
作为一种示例，当通过在非接入层信令中增加每个PLMN的信号质量临界值的方式为终端设备配置或更新每个PLMN的信号质量临界值时，网络设备(可选为，UDM网元)则通过非接入层信令向终端设备发送至少两个PLMN中每个PLMN的信号质量临界值。
相应的，终端设备通过对接收到的非接入层信令进行解析可以获取到至少两个PLMN的信号质量临界值。在一种可能的设计中，终端设备可以将每个PLMN的信号质量临界值写入USIM卡或SIM卡中的用户配置文件中，或者更新USIM卡或SIM卡中用户配置文件内的每个PLMN的信号质量临界值。在另一种可能的设计中，终端设备可以将获取到的每个PLMN的信号质量临界值存储至终端设备的存储空间中，以便后续使用。
作为另一种示例，对于上述至少两个PLMN中的每个PLMN，当通过在基站的系统消息中增加该PLMN的信号质量临界值的方式为终端设备配置或更新该PLMN的信号质量临界值时，网络设备(可选为，基站)则通过系统消息，向终端设备广播该PLMN的信号质量临界值。相应的，终端设备可以对接收到的系统消息进行解析，从而确定出对应PLMN的信号质量临界值。
可以理解的是，网络设备只能将其所属PLMN的信号质量临界值发送给终端设备，终端设备要想获取到至少两个PLMN中每个PLMN的信号质量临界值需要对接收到的至少一个系统消息进行解析来确定。
可选的，在本申请的实施例中，信号质量临界值包括如下至少一种：
PLMN对应的信号质量临界值、PLMN所使用的无线接入技术对应的信号质量临界值。
可选的，PLMN可以指不同运营商的网络，PLMN对应的信号质量临界值是指允许终端设备选择时，该PLMN的信号质量最小值；PLMN所使用的无线接入技术可以是2G、3G、4G或5G中的任何一种，因而，PLMN所使用的无线接入技术对应的信号质量临界值是指允许终端设备选择时，该PLMN所使用的无线接入技术的信号质量最小值。
可理解的是，不同PLMN对应的信号质量临界值、不同PLMN所使用的相同无线接入技术对应的信号质量临界值、相同PLMN所使用的不同无线接入技术对应的信号质量临界值等可以相同，也可以不同，其根据对应运营商能够接收的最小值确定，此处不作赘述。
相应的，在本申请的实施例中，上述第一参数还可以包括：信号质量临界值，即，在上述S302之前，该选择网络的方法还可以包括如下步骤：
S403、终端设备获取至少两个PLMN中每个PLMN的信号质量临界值。
在本实施例中，当网络设备为终端设备配置并发送了每个PLMN的信号质量临界值后，该终端设备通过对接收到的信息进行解析处理，便可以得到每个PLMN的信号质量临界值。
作为一种示例，信号质量临界值来自于全球用户识别卡中的用户配置文件。
可选的，在本示例的一种可能设计中，表3为本申请实施例中USIM卡内用户配置文件的一种结构。参照表3可知，该表3与上述表1的区别在于，每个PLMN的后面还配置有该PLMN的信号强度，即，该PLMN的信号质量临界值。例如，第一个PLMN的后面配置有第一个PLMN的信号强度，也就是第一个PLMN的信号质量临界值，第二个PLMN的后面配置有第二个PLMN的信号强度，也就是第二个PLMN的信号质量临界值等；相应的，第n个PLMN的后面配置有第n个PLMN的信号强度，也就是第n个PLMN的信号质量临界值。
表3本申请实施例中USIM卡内用户配置文件的一种结构
Figure PCTCN2021082415-appb-000005
Figure PCTCN2021082415-appb-000006
可以理解的是，在实际应用中，每个PLMN占用3字节是考虑PLMN ID的格式，是个固定字节长度，新增加的每个PLMN对应的信号强度通常占2字节，考虑到需要兼容已发布的标准，可能会使用新字段。相应的，文件的大小也可能发生变化，而且，每个字节表示的含义可能有所变化，其可以根据后续的标准进行确定，此处不作赘述。
可选的，在本示例的另一种可能设计中，表4为本申请实施例中USIM卡内用户配置文件的另一种结构。参照表4可知，该表4与上述表1的区别在于，每个PLMN所使用的无线接入技术标识的后面还配置有该PLMN所使用的无线接入技术标识的信号强度，即，该PLMN所使用的无线接入技术的信号质量临界值。例如，第一个PLMN所使用的无线接入技术标识的后面配置有第一个PLMN所使用的无线接入技术标识的信号强度，也就是第一个PLMN所使用的无线接入技术的信号质量临界值，第二个PLMN所使用的无线接入技术标识的后面配置有第二个PLMN所使用的无线接入技术标识的信号强度，也就是第二个PLMN所使用的无线接入技术的信号质量临界值等；相应的，第n个PLMN所使用的无线接入技术标识的后面配置有第n个PLMN所使用的无线接入技术标识的信号强度，也就是第n个PLMN所使用的无线接入技术的信号质量临界值。
表4本申请实施例中USIM卡内用户配置文件的另一种结构
Figure PCTCN2021082415-appb-000007
可以理解的是，在实际应用中，由于目前每个PLMN所使用的无线接入技术标识占用的字节长度不固定，因而，每个PLMN所使用的无线接入技术的信号强度与该PLMN所使用的无线接入技术的标识可以合并占用2字节长度。但是，为了兼容已发布的标准，可能会使用新的字段，相应的，文件的大小也可能发生变化，而且，每个字节表示的含义可能有所变化，其可以根据后续的标准进行确定，此处不作赘述。
可选的，在本示例的再一种可能设计中，表5为本申请实施例中USIM卡内用户配置文件的再一种结构。参照表5可知，该表5与上述表1的区别在于，每个PLMN的后面配置有该PLMN的信号强度(即，该PLMN的信号质量临界值)，且每个PLMN所使用的无线接入技术标识的后面也配置有该PLMN所使用的无线接入技术标识的信号强度(即，该PLMN所使用的无线接入技术的信号质量临界值)。例如，第一个PLMN的后面配置有第一个PLMN的信号强度，第一个PLMN所使用的无线接入技术标识的后面配置有第一个PLMN所使用的无线接入技术标识的信号强度；以此类推，第n个PLMN的后面配置有第n个PLMN的信号强度，第n个PLMN所使用的无线接入技术标识的后面配置有第n个PLMN所使用的无线接入技术标识的信号强度。
表5本申请实施例中USIM卡内用户配置文件的再一种结构
Figure PCTCN2021082415-appb-000008
Figure PCTCN2021082415-appb-000009
表5中的每个PLMN的信号强度和每个PLMN所使用的无线接入技术的信号强度的配置方式，与上述表3和表4中记载类似，此处不作赘述。
在本申请的实施例中，由于每个PLMN对应的无线接入技术可能会有多个，因而，在一种可能的设计中，第一个PLMN的标识和第二个PLMN的标识可能相同，第一个PLMN所使用的无线接入技术和第二个PLMN所使用的无线接入技术不同，在另一种可能的设计中，第一个PLMN的标识和第二个PLMN的标识不同，而第一个PLMN所使用的无线接入技术和第二个PLMN所使用的无线接入技术可能相同，本实施例中并不对其进行限定。
可以理解的是，本申请实施例以用户配置文件为具有接入技术的HPLMN选择器文件进行解释说明。在实际应用中，该用户配置文件还可以是具有接入技术的运营商控制PLMN选择器文件或其他PLMN选择器文件，在文件中配置PLMN的信号强度临界值或PLMN所使用无线接入技术的信号强度临界值的方式类似，此处不作赘述。
根据上述记载可知，在实际应用中，终端设备可以包括：接入层和非接入层。因而，终端设备的非接入层可以通过读取USIM卡中用户配置文件的方式获取每个PLMN的信号质量临界值。
可选的，终端设备的接入层自下至上可以包括：物理(physical，PHY)层、媒体访问控制(media access control，MAC)层、无线链路控制(radio link control，RLC)层、分组数据汇聚协议(packet data convergence protocol，PDCP)层、无线资源控制(radio resource control，RRC)层。终端设备的非接入层可以包括：非接入移动性管理(NAS mobile management，NAS-MM)层和非接入会话管理(NAS session management，NAS-SM)层。其中，NAS-SM用于支持终端设备和SMF之间的会话管理功能，NAS-MM用于支持终端设备和AMF之间的移动性管理功能。
进一步的，在本申请的一种实施例中，终端设备的非接入层可以将上述至少两个PLMN中每个PLMN的标识和信号质量临界值发送给终端设备的接入层，以便接入层执行PLMN的选择。
作为另一种示例，每个PLMN的信号质量临界值还可以来自终端设备的存储空间。即，终端设备在执行PLMN选择过程中，当检测到至少两个PLMN和该至少两个PLMN中每个PLMN的信号质量时，终端设备可以从内部的存储空间获取每个PLMN的信号质量临界值。
可选的，当网络设备通过非接入层信令向终端设备发送每个PLMN的信号质量临界值时，相应的，终端设备的非接入层便可以通过非接入层信令获得每个PLMN的信号质量临界值。
作为再一种示例，每个PLMN的信号质量临界值来自于网络设备的系统信息。在本实施例中，当网络设备在系统信息中配置并发送该网络设备所在PLMN的信号质量临界值时，终端设备的接入层读取接收到的系统消息时，可以获取到该网络设备所在PLMN的信号质量临界值。
相应的，在本实施例中，上述S302可以替换为如下步骤：
S404、终端设备根据上述至少两个PLMN中每个PLMN的信号质量、信号质量临界值和优先级，从至少两个PLMN中确定出第一PLMN。
在本申请的实施例中，终端设备在获取到至少两个PLMN中每个PLMN的信号质量、信号质量临界值后，便可以结合每个PLMN的优先级，在获取到的至少两个PLMN中选择一个作为第一PLMN。
本申请实施例提供的选择网络的方法，网络设备为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值，并将其发送给终端设备，相应的，终端设备获取到至少两个PLMN中每个PLMN的信号质量临界值后，根据每个PLMN的信号质量、信号质量临界值和优先级，从至少两个PLMN中确定出第一PLMN。该技术方案中，终端设备根据网络设备配置或更新的至少两个PLMN的信号质量临界值，再结合检测到的至少两个PLMN中每个PLMN的信号质量和优先级，能够确定出既能满足信号质量要求，又具有高优先级的第一PLMN，使得终端设备接入到第一PLMN后具有较高的稳定性。
在实际应用中，由于终端设备包括的接入层和非接入层均可以参与到PLMN的选择过程，因而，下述在图5至图8所示的实施例中以终端设备中接入层和非接入层的信息交互对上述S404的具体实现进行解释说明。关于图5至图8所示的实施例中未详尽的实现原理可以参见上述图3和图4所示实施例中的记载，此处不作赘述。
在本申请实施例的一种可能设计中，图5为本申请实施例提供的选择网络的方法实施例三的流程示意图。如图5所示，在本申请的实施例中，该选择网络的方法可以包括如下步骤：
S501、终端设备的接入层检测到至少两个PLMN和至少两个PLMN中每个PLMN的信号质量。
S502、终端设备的接入层将至少两个PLMN中每个PLMN的标识和信号质量发送给终端设备的非接入层。
S503、终端设备的非接入层获取至少两个PLMN中每个PLMN的信号质量临界值。
S504、终端设备的非接入层按照至少两个PLMN的优先级由高到低的顺序，依次将至少两个PLMN中的每个PLMN的信号质量与信号质量临界值进行对比，直到确定出信号质量大于或等于信号质量临界值的第一PLMN。
在本申请的实施例中，终端设备的接入层用于搜索所处场景的PLMN的标识和信号质量并传输给非接入层，非接入层获取每个PLMN的信号质量临界值和优先级，以及按照至少两个PLMN中每个PLMN的优先级由高到低的顺序，将信号质量大于或等于信号质量临界值且优先级最高的PLMN确定为第一PLMN。该方案中，非接入层能够选择出信号质量满足要求且高优先级的PLMN，在一定程度上保证了终端设备接入网络后的稳定性。
在本申请实施例的另一种可能设计中，图6为本申请实施例提供的选择网络的方法实施例四的流程示意图。如图6所示，在本申请的实施例中，该选择网络的方法可以包括如下步骤：
S601、终端设备的接入层检测到至少两个PLMN和至少两个PLMN中每个PLMN的信号质量。
S602、终端设备的接入层将至少两个PLMN中每个PLMN的标识和信号质量发送给终端设备的非接入层。
S603、终端设备的非接入层获取至少两个PLMN中每个PLMN的信号质量临界值。
S604、终端设备的非接入层根据至少两个PLMN中每个PLMN的信号质量和信号质量临界值，确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN。
S605、非接入层根据至少一个候选PLMN中每个候选PLMN的优先级，将至少两个候选PLMN中优先级最高的PLMN作为第一PLMN。
本申请实施例与上述图5所示实施例的区别在于，非接入层选择第一PLMN的方式不同。
具体的，在本申请的实施例中，终端设备的非接入层从接入层获取到至少两个PLMN中每个PLMN的标识和信号质量后，便结合自身获取到的每个PLMN的信号质量临界值，首先在至少两个PLMN中确定信号质量大于或等于信号质量临界值的至少一个候选PLMN，然后在结合这些候选PLMN的优先级，从中选择优先级最高的PLMN作为最终选择的第一PLMN，即接入层根据每个PLMN的信号质量和信号质量临界值，将至少两个PLMN中信号质量大于或等于信号质量临界值且优先级最高的PLMN作为第一PLMN。
本申请的技术方案中，终端设备的非接入层也能够选择出信号质量满足要求且高优先级的PLMN，同样可以在一定程度上保证了终端设备接入网络后的稳定性。
在本申请实施例的再一种可能设计中，图7为本申请实施例提供的选择网络的方法实施例五的流程示意图。如图7所示，在本申请的实施例中，该选择网络的方法可以包括如下步骤：
S701、终端设备的接入层检测到至少两个PLMN和至少两个PLMN中每个PLMN的信号质量。
S702、终端设备的非接入层获取至少两个PLMN中每个PLMN的信号质量临界值。
S703、终端设备的非接入层将至少两个PLMN中每个PLMN的标识和信号质量临界值发送给接入层。
S704、终端设备的接入层根据接收到的至少两个PLMN中每个PLMN的信号质量和信号质量临界值，确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN。
S705、终端设备的接入层将至少一个候选PLMN中每个候选PLMN的标识发送给非接入层。
S706、终端设备的非接入层根据至少一个候选PLMN中每个候选PLMN的优先级，将优先级最高的PLMN确定为第一PLMN。
在本申请的实施例中，终端设备的非接入层将获取到的每个PLMN的信号质量临界值发送给接入层，由接入层根据每个PLMN的信号质量临界值在检测到的至少两个PLMN中确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN，随后再由非接入层根据至少一个候选PLMN的优先级，将至少一个候选PLMN中优先级最高的PLMN确定为第一PLMN。该方案中，非接入层同样能够选择出信号质量满足要求且高优先级的PLMN，在一定程度上保证了终端设备接入网络后的稳定性。
可以理解的是，在图5至图7中，非接入层获取每个PLMN的信号质量临界值的方式，一种设计方案可以是：非接入层通过读取USIM卡中用户配置文件的方式获取；另一种设计方案可以是：非接入层通过非接入层信令获取网络设备(UDM)发送的每个PLMN的信号质量临界值；再一种设计方案可以是非接入层从终端设备的内部存储空间读取预先存储的每个PLMN的信号质量临界值。本申请实施例并不对非接入层获取每个PLMN的信号质量临界值的方式进行限定，其可以根据实际场景确定，此处不作赘述。
在本申请实施例的又一种可能设计中，图8为本申请实施例提供的选择网络的方法实施例六的流程示意图。如图8所示，在本申请的实施例中，该选择网络的方法可以包括如下步骤：
S801、终端设备的接入层检测到至少两个PLMN和至少两个PLMN中每个PLMN的信号质量。
S802、终端设备的接入层获取至少两个PLMN中每个PLMN的信号质量临界值。
具体的，接入层通常是通过读取系统消息的方式获取基站配置的每个PLMN的信号质量临界值。
S803、终端设备的接入层根据至少两个PLMN中每个PLMN的信号质量和信号质量临界值，确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN。
S804、终端设备的接入层将至少一个候选PLMN中每个候选PLMN的标识发送给非接入层。
S805、终端设备的非接入层根据至少一个候选PLMN中每个候选PLMN的优先级，将优先级最高的PLMN确定为第一PLMN。
可以理解的是，在候选PLMN的数量为1个时，终端设备的非接入层则可以直接将该候选PLMN确定为第一PLMN，而无需根据优先级进行判断。
在本申请的实施例中，终端设备的接入层既可以获取到的每个PLMN的信号质量临界值，也可以获取检测到的至少两个PLMN和至少两个PLMN中每个PLMN的信号质量，这时，接入层可以根据每个PLMN的信号质量临界值在检测到的至少两个PLMN中确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN，随后再发送给非接入层，由非接入层根据候选PLMN的优先级，在至少一个候选PLMN中确定出优先级最高的第一PLMN。该方案中，非接入层同样能够选择出信号质量满足要求且高优先级的PLMN，在一定程度上保证了终端设备接入网络后的稳定性。
上述介绍了本申请实施例提到的选择网络的方法的具体实现，下述为本申请装置实施例，可以用于执行本申请方法实施例。对于本申请装置实施例中未披露的细节，请参照本申请方法实施例。
图9为本申请提供的选择网络的装置实施例一的结构示意图。该装置可以集成在终端设备中，也可以通过终端设备实现。如图9所示，该选择网络的装置可以包括：
获取模块901，用于获取至少两个公共陆地移动网PLMN中每个PLMN的第一参数，所述第一参数包括：信号质量和优先级；
处理模块902，用于根据所述至少两个PLMN中每个PLMN的第一参数，从所述至少两个PLMN中选择第一PLMN。
在本申请实施例的一种可能设计中，所述第一参数还包括：信号质量临界值；
相应的，所述处理模块902，具体用于根据所述至少两个PLMN中每个PLMN的信号质量、信号质量临界值和优先级，从所述至少两个PLMN中确定出所述第一PLMN。
可选的，所述信号质量临界值来自于全球用户识别卡中的用户配置文件。
作为一种示例，所述处理模块902，具体用于：
通过所述装置的非接入层按照所述至少两个PLMN的优先级由高到低的顺序，依次将所述至少两个PLMN中每个PLMN的信号质量与信号质量临界值进行对比，直到确定出信号质量大于或等于信号 质量临界值的所述第一PLMN。
作为另一种示例，所述处理模块902，具体用于：
通过所述装置的非接入层根据所述至少两个PLMN中每个PLMN的信号质量和信号质量临界值，将所述至少两个PLMN中信号质量大于或等于信号质量临界值且优先级最高的PLMN作为所述第一PLMN。
作为再一种示例，所述处理模块902，还用于通过所述装置的非接入层将所述至少两个PLMN中每个PLMN的标识和信号质量临界值发送给所述装置的接入层。
在本申请实施例的另一种可能设计中，所述获取模块901，还用于利用所述装置的非接入层通过非接入层信令获得所述至少两个PLMN中每个PLMN的信号质量临界值。
在本申请实施例的再一种可能设计中，所述信号质量临界值来自于网络设备的系统信息。
可选的，所述处理模块902，具体用于：
通过所述装置的接入层根据所述至少两个PLMN中每个PLMN的信号质量和信号质量临界值，确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN；
通过所述装置的接入层将所述至少一个候选PLMN中每个候选PLMN的标识发送给所述装置的非接入层；
通过所述装置的非接入层根据所述至少一个候选PLMN中每个候选PLMN的优先级，将优先级最高的PLMN确定为所述第一PLMN。
在本申请实施例的上述各种可能设计中，所述信号质量临界值包括如下至少一种：
PLMN对应的信号质量临界值、PLMN所使用的无线接入技术对应的信号质量临界值。
在本申请实施例的又一种可能设计中，所述处理模块902，具体用于：
根据所述至少两个PLMN中每个PLMN的信号质量，按照信号质量由高到低的顺序对所述至少两个PLMN进行排序，筛选出排序在前的N个PLMN，所述N为大于或等于1的整数；
将所述N个PLMN中优先级最高的PLMN，确定为所述第一PLMN。
本实施例提供的选择网络的装置，用于执行前述方法实施例中终端设备侧的技术方案，其实现原理和技术效果类似，在此不再赘述。
图10为本申请提供的选择网络的装置实施例二的结构示意图。该装置可以集成在网络设备中，也可以通过网络设备实现。如图10所示，该选择网络的装置可以包括：
处理模块1001，用于为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值；
发送模块1002，用于将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
在本申请实施例的一种可能设计中，所述发送模块1002，具体用于通过非接入层信令，将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
在本申请实施例的另一种可能设计中，所述处理模块1001，具体用于对于所述至少两个PLMN中的每个PLMN，在基站的系统消息中增加所述PLMN的信号质量临界值；
相应的，所述发送模块1002，具体用于通过所述系统消息，将所述至少两个PLMN中每个PLMN的信号质量临界值发送广播给所述终端设备。
本实施例提供的选择网络的装置，用于执行前述方法实施例中网络设备侧的技术方案，其实现原理和技术效果类似，在此不再赘述。
图11为本申请提供的终端设备实施例的结构示意图。如图11所示，该终端设备可以包括：处理器1101、存储器1102、接收器1103、与网络设备进行通信的接口1104。
其中，存储器1102存储计算机执行指令；
处理器1101执行存储器1102存储的计算机执行指令，使得处理器1101执行如前述方法实施例中的终端设备侧的技术方案。
图12为本申请提供的网络设备的结构示意图。如图12所示，该网络设备可以包括：处理器1201、存储器1202、发送器1203，以及与终端设备进行通信的接口1204。
其中，存储器1202存储计算机执行指令；
处理器1201执行存储器1202存储的计算机执行指令，使得处理器1201执行前述方法实施例中的网络设备侧的技术方案。
进一步的，本申请实施例还可以提供一种通信系统，该通信系统可以包括：终端设备和网络设备。
其中，该终端设备可以包括前述图9所述的选择网络的装置或者为图11所述的终端设备，该终端设备用于实现前述方法实施例中终端设备的技术方案。该网络设备可以包括前述图10所述的选择网络的装置或者为图12所述的网络设备，该网络设备用于实现前述方法实施例中网络设备的技术方案。
可以理解的是，该通信系统还可以包括其他设备，其可以根据实际场景确定，此处不再赘述。
本申请还提供一种计算机可读存储介质，计算机可读存储介质中存储有计算机执行指令，当计算机执行指令被处理器执行时用于实现前述方法实施例中的终端设备侧的技术方案。
本申请还提供一种计算机可读存储介质，计算机可读存储介质中存储有计算机执行指令，当计算机执行指令被处理器执行时用于实现前述方法实施例中的网络设备侧的技术方案。
本申请实施例还提供一种程序，当该程序被处理器执行时，用于执行前述方法实施例中的终端设备侧的技术方案。
本申请实施例还提供一种程序，当该程序被处理器执行时，用于执行前述方法实施例中的网络设备侧的技术方案。
本申请实施例还提供一种计算机程序产品，包括计算机程序，该计算机程序被处理器执行时用于实现前述方法实施例中的终端设备侧的技术方案。
本申请实施例还提供一种计算机程序产品，包括计算机程序，该计算机程序被处理器执行时用于实现前述方法实施例中的网络设备侧的技术方案。
本申请实施例还提供了一种芯片，包括：处理模块与通信接口，该处理模块能执行前述方法实施例中的终端设备侧的技术方案。
进一步地，该芯片还包括存储模块(如，存储器)，存储模块用于存储指令，处理模块用于执行存储模块存储的指令，并且对存储模块中存储的指令的执行使得处理模块执行上述方法实施例中的终端设备侧的技术方案。
本申请实施例还提供了一种芯片，包括：处理模块与通信接口，该处理模块能执行前述方法实施例中的网络设备侧的技术方案。
进一步地，该芯片还包括存储模块(如，存储器)，存储模块用于存储指令，处理模块用于执行存储模块存储的指令，并且对存储模块中存储的指令的执行使得处理模块执行上述方法实施例中的网络设备侧的技术方案。
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，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。
在上述网络设备以及终端设备的具体实现中，应理解，处理器可以是中央处理单元(英文：Central Processing Unit，简称：CPU)，还可以是其他通用处理器、数字信号处理器(英文：Digital Signal Processor，简称：DSP)、专用集成电路(英文：Application Specific Integrated Circuit，简称：ASIC)等。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。结合本申请所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一可读取存储器中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储器(存储介质)包括：只读存储器(英文：read-only memory，简称：ROM)、RAM、快闪存储器、硬盘、固态硬盘、磁带(英文：magnetic tape)、软盘(英文：floppy disk)、光盘(英文：optical disc)及其任意组合。

Claims (35)

  1. 一种选择网络的方法，其特征在于，包括：
    终端设备获取至少两个公共陆地移动网PLMN中每个PLMN的第一参数，所述第一参数包括：信号质量和优先级；
    所述终端设备根据所述至少两个PLMN中每个PLMN的第一参数，从所述至少两个PLMN中选择第一PLMN。
  2. 根据权利要求1所述的方法，其特征在于，所述第一参数还包括：信号质量临界值；
    所述终端设备根据所述至少两个PLMN中每个PLMN的第一参数，从所述至少两个PLMN中选择第一PLMN，包括：
    所述终端设备根据所述至少两个PLMN中每个PLMN的信号质量、信号质量临界值和优先级，从所述至少两个PLMN中确定出所述第一PLMN。
  3. 根据权利要求2所述的方法，其特征在于，所述信号质量临界值来自于全球用户识别卡中的用户配置文件。
  4. 根据权利要求2或3所述的方法，其特征在于，所述终端设备根据所述至少两个PLMN中每个PLMN的信号质量、信号质量临界值和优先级，从所述至少两个PLMN中确定出所述第一PLMN，包括：
    所述终端设备的非接入层按照所述至少两个PLMN的优先级由高到低的顺序，依次将所述至少两个PLMN中每个PLMN的信号质量与信号质量临界值进行对比，直到确定出信号质量大于或等于信号质量临界值的所述第一PLMN。
  5. 根据权利要求2或3所述的方法，其特征在于，所述终端设备根据所述至少两个PLMN中每个PLMN的信号质量、信号质量临界值和优先级，从所述至少两个PLMN中确定出所述第一PLMN，包括：
    所述终端设备的非接入层根据所述至少两个PLMN中每个PLMN的信号质量和信号质量临界值，将所述至少两个PLMN中信号质量大于或等于信号质量临界值且优先级最高的PLMN作为所述第一PLMN。
  6. 根据权利要求2或3所述的方法，其特征在于，所述方法还包括：
    所述终端设备的非接入层将所述至少两个PLMN中每个PLMN的标识和信号质量临界值发送给所述终端设备的接入层。
  7. 根据权利要求3-6任一项所述的方法，其特征在于，所述方法还包括：
    所述终端设备的非接入层通过非接入层信令获得所述至少两个PLMN中每个PLMN的信号质量临界值。
  8. 根据权利要求2所述的方法，其特征在于，所述信号质量临界值来自于网络设备的系统信息。
  9. 根据权利要求6或8所述的方法，其特征在于，所述终端设备根据所述至少两个PLMN中每个PLMN的信号质量、信号质量临界值和优先级，从所述至少两个PLMN中确定出所述第一PLMN，包括：
    所述终端设备的接入层根据所述至少两个PLMN中每个PLMN的信号质量和信号质量临界值，确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN；
    所述终端设备的接入层将所述至少一个候选PLMN中每个候选PLMN的标识发送给所述终端设备的非接入层；
    所述终端设备的非接入层根据所述至少一个候选PLMN中每个候选PLMN的优先级，将优先级最高的PLMN确定为所述第一PLMN。
  10. 根据权利要求2-9任一项所述的方法，其特征在于，所述信号质量临界值包括如下至少一种：
    PLMN对应的信号质量临界值、PLMN所使用的无线接入技术对应的信号质量临界值。
  11. 根据权利要求1所述的方法，其特征在于，所述终端设备根据所述至少两个PLMN中每个PLMN的第一参数，从所述至少两个PLMN中选择第一PLMN，包括：
    根据所述至少两个PLMN中每个PLMN的信号质量，按照信号质量由高到低的顺序对所述至少两个PLMN进行排序，筛选出排序在前的N个PLMN，所述N为大于或等于1的整数；
    将所述N个PLMN中优先级最高的PLMN，确定为所述第一PLMN。
  12. 一种选择网络的方法，其特征在于，包括：
    网络设备为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值；
    所述网络设备将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
  13. 根据权利要求12所述的方法，其特征在于，所述网络设备所述网络设备将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备，包括：
    所述网络设备通过非接入层信令，将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
  14. 根据权利要求12所述的方法，其特征在于，所述网络设备为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值，包括：
    对于所述至少两个PLMN中的每个PLMN，所述网络设备在基站的系统消息中增加所述PLMN的信号质量临界值；
    相应的，所述网络设备将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备，包括：
    所述网络设备通过所述系统消息，将所述至少两个PLMN中每个PLMN的信号质量临界值发送广播给所述终端设备。
  15. 一种选择网络的装置，其特征在于，包括：
    获取模块，用于获取至少两个公共陆地移动网PLMN中每个PLMN的第一参数，所述第一参数包括：信号质量和优先级；
    处理模块，用于根据所述至少两个PLMN中每个PLMN的第一参数，从所述至少两个PLMN中选择第一PLMN。
  16. 根据权利要求15所述的装置，其特征在于，所述第一参数还包括：信号质量临界值；
    所述处理模块，具体用于：
    根据所述至少两个PLMN中每个PLMN的信号质量、信号质量临界值和优先级，从所述至少两个PLMN中确定出所述第一PLMN。
  17. 根据权利要求16所述的装置，其特征在于，所述信号质量临界值来自于全球用户识别卡中的用户配置文件。
  18. 根据权利要求16或17所述的装置，其特征在于，所述处理模块，具体用于：
    通过所述装置的非接入层按照所述至少两个PLMN的优先级由高到低的顺序，依次将所述至少两个PLMN中每个PLMN的信号质量与信号质量临界值进行对比，直到确定出信号质量大于或等于信号质量临界值的所述第一PLMN。
  19. 根据权利要求16或17所述的装置，其特征在于，所述处理模块，具体用于：
    通过所述装置的非接入层根据所述至少两个PLMN中每个PLMN的信号质量和信号质量临界值，将所述至少两个PLMN中信号质量大于或等于信号质量临界值且优先级最高的PLMN作为所述第一PLMN。
  20. 根据权利要求16或17所述的装置，其特征在于，所述处理模块，还用于通过所述装置的非接入层将所述至少两个PLMN中每个PLMN的标识和信号质量临界值发送给所述装置的接入层。
  21. 根据权利要求17-20任一项所述的装置，其特征在于，所述获取模块，还用于利用所述装置的非接入层通过非接入层信令获得所述至少两个PLMN中每个PLMN的信号质量临界值。
  22. 根据权利要求16所述的装置，其特征在于，所述信号质量临界值来自于网络设备的系统信息。
  23. 根据权利要求20或22所述的装置，其特征在于，所述处理模块，具体用于：
    通过所述装置的接入层根据所述至少两个PLMN中每个PLMN的信号质量和信号质量临界值，确定出信号质量大于或等于信号质量临界值的至少一个候选PLMN；
    通过所述装置的接入层将所述至少一个候选PLMN中每个候选PLMN的标识发送给所述装置的非接入层；
    通过所述装置的非接入层根据所述至少一个候选PLMN中每个候选PLMN的优先级，将优先级最高的PLMN确定为所述第一PLMN。
  24. 根据权利要求16-23任一项所述的装置，其特征在于，所述信号质量临界值包括如下至少一种：
    PLMN对应的信号质量临界值、PLMN所使用的无线接入技术对应的信号质量临界值。
  25. 根据权利要求15所述的装置，其特征在于，所述处理模块，具体用于：
    根据所述至少两个PLMN中每个PLMN的信号质量，按照信号质量由高到低的顺序对所述至少两个PLMN进行排序，筛选出排序在前的N个PLMN，所述N为大于或等于1的整数；
    将所述N个PLMN中优先级最高的PLMN，确定为所述第一PLMN。
  26. 一种选择网络的装置，其特征在于，包括：
    处理模块，用于为终端设备配置或更新至少两个PLMN中每个PLMN的信号质量临界值；
    发送模块，用于将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
  27. 根据权利要求26所述的装置，其特征在于，所述发送模块，具体用于通过非接入层信令，将所述至少两个PLMN中每个PLMN的信号质量临界值发送给所述终端设备。
  28. 根据权利要求26所述的装置，其特征在于，所述处理模块，具体用于对于所述至少两个PLMN中的每个PLMN，在基站的系统消息中增加所述PLMN的信号质量临界值；
    相应的，所述发送模块，具体用于通过所述系统消息，将所述至少两个PLMN中每个PLMN的信号质量临界值发送广播给所述终端设备。
  29. 一种终端设备，其特征在于，包括：
    处理器、存储器、接收器，以及与网络设备进行通信的接口；
    所述存储器存储计算机执行指令；
    所述处理器执行所述存储器存储的计算机执行指令，使得所述处理器执行如上述权利要求1-11任一项所述的方法。
  30. 一种网络设备，其特征在于，包括：
    处理器、存储器、发送器，以及与终端设备进行通信的接口；
    所述存储器存储计算机执行指令；
    所述处理器执行所述存储器存储的计算机执行指令，使得所述处理器执行如上述权利要求12-14任一项所述的方法。
  31. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有计算机执行指令，当所述计算机执行指令被处理器执行时用于实现如上述权利要求1-11任一项所述的方法。
  32. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有计算机执行指令，当所述计算机执行指令被处理器执行时用于实现如上述权利要求12-14任一项所述的方法。
  33. 一种计算机程序产品，包括：计算机程序，其特征在于，所述计算机程序被处理器执行时用于实现如上述权利要求1-11任一项所述的方法。
  34. 一种计算机程序产品，包括：计算机程序，其特征在于，所述计算机程序被处理器执行时用于实现如上述权利要求12-14任一项所述的方法。
  35. 一种通信系统，包括：网络设备和终端设备，其特征在于，所述终端设备包括上述权利要求15-25任一项所述的装置，用于实现上述权利要求1-11任一项所述的方法；
    所述网络设备包括上述权利要求26-28任一项所述的装置，用于实现上述权利要求12-14任一项所述的方法。
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