WO2023070570A1 - 一种搜网方法及通信装置 - Google Patents

一种搜网方法及通信装置 Download PDF

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Publication number
WO2023070570A1
WO2023070570A1 PCT/CN2021/127610 CN2021127610W WO2023070570A1 WO 2023070570 A1 WO2023070570 A1 WO 2023070570A1 CN 2021127610 W CN2021127610 W CN 2021127610W WO 2023070570 A1 WO2023070570 A1 WO 2023070570A1
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WIPO (PCT)
Prior art keywords
network
plmn
cell
private network
cag
Prior art date
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PCT/CN2021/127610
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English (en)
French (fr)
Inventor
文露涛
罗小烽
羿丹丹
江志洲
夏苗方
强鹂
陈功
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2021/127610 priority Critical patent/WO2023070570A1/zh
Priority to CN202180101060.0A priority patent/CN117730572A/zh
Publication of WO2023070570A1 publication Critical patent/WO2023070570A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the technical field of wireless communication, and in particular to a network searching method and a communication device.
  • the 3rd generation partnership project (3GPP) introduced the closed information group (CAG) feature.
  • terminal devices may be used in a variety of possible network environments, such as a network environment with only public network coverage, or a network environment with only private network coverage, or a mixture of public and private networks (that is, there are public network coverage and Private network coverage) network environment, etc.
  • a network environment with only public network coverage or a network environment with only private network coverage, or a mixture of public and private networks (that is, there are public network coverage and Private network coverage) network environment, etc.
  • there is no explicit optimal control on how the terminal device accesses the private network or the public network Whether the terminal device accesses the private network or the public network mainly depends on the coverage of the public network or the private network in the current environment. , thus affecting the power consumption and user experience of the terminal device. For example, for terminal devices that support CAG, users cannot choose to only try to reside on the private network and quickly switch from the public network to the private network; for terminal devices that do not support CAG, users cannot lock only to try to reside on the public network.
  • This application provides a network search method and communication device, which are used to effectively control whether the terminal equipment is connected to the public network or the private network, so that terminal equipment with different business needs can selectively access the public network or the private network, and support CAG
  • the terminal device can quickly switch between the public network and the private network, thereby reducing the power consumption of the terminal device and improving user experience.
  • the embodiment of the present application provides a method for searching the Internet.
  • the method is applied to a terminal device, for example, it may be a complete terminal device, or it may be a chip or a circuit configured in the terminal device.
  • the terminal device supports a private network and a public network; the method includes: the terminal device obtains a network search mode, and the network search mode is one of a private network mode, a public network mode and a private network priority mode; , staying in a private network cell or a public network cell or switching between a public network cell and a private network cell.
  • the above technical solution can enable the terminal device to quickly access the services provided by the public network or private network based on the acquired network search mode among the private network mode, public network mode and private network priority mode, or to connect between public network and private network. Fast switching between networks, while reducing the power consumption of terminal equipment.
  • the terminal device if the network search mode is a private network mode, the terminal device resides in a private network cell or a public network cell or switches between a public network cell and a private network cell according to the network search mode, including : The terminal device selects a PLMN that supports CAG among the PLMNs of the first communication standard according to the priority order of each PLMN in the PLMN list, and the network of the first communication standard supports the CAG function; the terminal device performs cell search in the selected PLMN, if If a private network cell supporting the selected PLMN is found, and the CAG associated with the private network cell is a CAG supported by the terminal device, the terminal device camps in the private network cell.
  • the method further includes: the terminal device sends a registration request message to the network element with the access and mobility management function, the registration request message includes first indication information, and the first indication information is used to indicate the terminal The device supports the CAG capability.
  • the above technical solution can enable the terminal device to reside on the private network through cell search in a network environment where there is private network coverage (including only private network coverage, and both public network coverage and private network coverage).
  • the terminal device if the network search mode is the public network mode, the terminal device resides in a public network cell or a private network cell or switches between a public network cell and a private network cell according to the network search mode, including : The terminal device selects the PLMN of the first communication standard that does not only support CAG according to the priority order of each PLMN in the PLMN list, or selects the PLMN of the second communication standard, and the network of the first communication standard supports the CAG function, The network of the second communication standard does not support the CAG function; the terminal device performs cell search in the selected PLMN, and if a public network cell supporting the selected PLMN is found, the terminal device camps on the public network cell.
  • the method further includes: the terminal device sends a registration request message to the network element with the access and mobility management function, the registration request message includes second indication information, and the second indication information is used to instruct the terminal The device does not support the CAG capability.
  • the above technical solution enables the terminal device to reside on the public network through cell search in a network environment where there is public network coverage (including only public network coverage, and both public network coverage and private network coverage).
  • the terminal device if the network search mode is the private network priority mode, and the terminal device currently resides in a public network cell, the terminal device resides in a public network cell or a private network cell or is in a public network cell according to the network search mode.
  • Switching between a network cell and a private network cell includes: when the first timer expires, the terminal device selects a PLMN that supports CAG among the PLMNs of the first communication standard, and the network of the first communication standard supports the CAG function; the terminal The device performs a cell search in the selected PLMN.
  • the first timer is configured to be started when the terminal device currently resides in a public network cell and the obtained network search mode is a private network priority mode.
  • the duration of the first timer is determined according to the number of starts of the first timer.
  • the method further includes: the terminal device clears the number of starts of the first timer to zero.
  • the method further includes: if no private network cell supporting the selected PLMN is found, or the CAG associated with the searched private network cell is not a CAG supported by the terminal device, the terminal device restarts the first a timer.
  • the above technical solution enables the terminal device to return from the public network to the private network by means of cell search in a network environment with public network coverage and private network coverage.
  • the terminal device if the network search mode is the private network priority mode, and the terminal device currently resides in the public network cell of the first PLMN, the terminal device resides in the public network cell or the private network cell according to the network search mode.
  • Cell or switch between a public network cell and a private network cell including: if the signal measurement information of the public network cell where the terminal device currently resides is worse than the set threshold, the terminal device obtains one or more neighbors of the public network cell.
  • the terminal device selects the private network cell supporting the first PLMN or the equivalent PLMN of the first PLMN from the one or more adjacent areas according to the signal measurement information of the one or more adjacent areas to reside in, If the private network cell does not exist, the terminal device selects a public network cell that supports the first PLMN or an equivalent PLMN of the first PLMN to camp on.
  • the above technical solution enables the terminal device to return from the public network to the private network through cell reselection in a network environment with public network coverage and private network coverage.
  • the terminal device if the network search mode is the private network priority mode and the terminal device is currently camped in a cell accessing the PLMN, the terminal device resides in a public network cell or a private network cell or is in a public network cell according to the network search mode.
  • Switching between the network cell and the private network cell includes: the terminal device periodically determines whether there is a high-priority PLMN available, and if there is a high-priority PLMN available, the terminal device selects the currently available PLMN with the highest priority; The terminal device performs a cell search in the currently available PLMN with the highest priority.
  • the terminal device If a private network cell supporting the currently available highest priority PLMN is found, and the CAG associated with the private network cell is the CAG supported by the terminal device, Then the terminal device camps on the private network cell; otherwise, if a public network cell supporting the currently available PLMN with the highest priority is found, the terminal device camps on the public network cell.
  • the above technical solution enables the terminal device to return to a high-priority PLMN from the visited PLMN in a network environment with public network coverage and private network coverage in the manner of cell search.
  • the terminal device obtaining the network search mode includes: the terminal device obtains the network search mode by reading the preset network search mode information in the SIM card or non-volatile memory; or, the terminal The device acquires the network search mode selected by the user by detecting the user's touch operation on the selection button corresponding to the network search mode in the network search mode selection menu on the user interface, and the network search mode selection menu includes the private network mode , the selection buttons corresponding to the public network mode and the private network priority mode respectively.
  • a network search mode supported by the terminal device may be preset in the SIM card or NV of the terminal device.
  • the search mode can be set and switched through the search mode selection menu.
  • the embodiment of the present application provides a communication device, which may have the function of realizing the terminal device in the first aspect above, and the communication device may be a terminal device, or may be a chip or a circuit included in the terminal device.
  • the above-mentioned functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware, and the hardware or software includes one or more modules or units or means corresponding to the above-mentioned functions.
  • the structure of the communication device includes a processing module and a transceiver module, wherein the processing module is configured to support the communication device to perform the corresponding functions of the terminal device in the first aspect above.
  • the transceiver module is used to support the communication between the communication device and other communication devices, for example, when the communication device is a terminal device, it can send a registration request message to the access and mobility management functional network element.
  • the communication device may also include a storage module, which is coupled to the processing module and stores necessary program instructions and data of the communication device.
  • the processing module may be a processor
  • the transceiver module may be a transceiver
  • the storage module may be a memory
  • the memory may be integrated with the processor, or may be configured separately from the processor.
  • the structure of the communication device includes a processor, and may also include a memory.
  • the processor is coupled with the memory, and is used to execute the program instructions stored in the memory, so that the communication device executes the method in the first aspect above.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication interface may be a transceiver or an input/output interface; when the communication device is a chip included in the terminal device, the communication interface may be an input/output interface of the chip.
  • the transceiver may be a transceiver circuit, and the input/output interface may be an input/output circuit.
  • the embodiment of the present application provides a chip system, including: a processor, the processor is coupled with a memory, the memory is used to store program instructions and data, and the processor is used to execute the program through a circuit or An instruction, so that the method in the above first aspect or any possible design of the first aspect is implemented.
  • the chip system further includes an interface circuit for exchanging program instructions and data with the processor.
  • processors in the chip system, and the processors may be implemented by hardware or by software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor can be a general-purpose processor that reads and executes program instructions stored in memory.
  • the memory can be integrated with the processor, or can be set separately from the processor.
  • the memory may be a non-transitory processor, such as a read-only memory ROM, which may be integrated with the processor on the same chip, or may be respectively disposed on different chips.
  • the embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores program instructions, and when the program instructions are executed by the communication device, the above-mentioned first aspect or the first aspect A method in any possible design is implemented.
  • the embodiment of the present application provides a computer program product.
  • the communication device reads and executes the computer program product, the method in the above-mentioned first aspect or any possible design of the first aspect is executed. accomplish.
  • the embodiment of the present application provides a communication system, where the communication system includes a terminal device, an access network device, and a core network device.
  • FIG. 1 is a schematic diagram of a network architecture of a communication system applicable to an embodiment of the present application
  • FIG. 2 and FIG. 3 are schematic diagrams of two application scenarios of the embodiment of the present application.
  • FIG. 4 is a schematic flow diagram of a method for searching the Internet provided in an embodiment of the present application.
  • FIG. 5 is a schematic flow diagram of a terminal device residing in a private network through cell search when the network search mode is a private network mode in an embodiment of the present application;
  • FIG. 6 is a schematic flow diagram of a terminal device residing on a public network through cell search in an embodiment of the present application when the network search mode is a public network mode;
  • FIG. 7 is a schematic flow diagram of returning a terminal device currently residing in a public network cell to a private network cell through cell search when the network search mode is the private network priority mode in an embodiment of the present application;
  • FIG. 8 is a schematic diagram of the process of returning a terminal device currently residing in a public network cell to a private network cell through cell reselection when the network search mode is the private network priority mode in an embodiment of the present application;
  • FIG. 9 is a schematic flow diagram of returning to a high-priority PLMN through cell search by a terminal device currently residing in an access PLMN when the network search mode is a private network priority mode in an embodiment of the present application;
  • FIG. 10 is a schematic flow diagram of a periodic high-priority network search performed by a terminal device in an embodiment of the present application
  • FIG. 11 and FIG. 12 are schematic structural diagrams of a communication device provided by an embodiment of the present application.
  • Embodiments of the present application can be applied to mobile communication systems, such as global system for mobile communications (global system for mobile communications, GSM), general packet radio service (general packet radio service, GPRS) communication system, code division multiple access (code division multiple access (CDMA) communication system, wideband code division multiple access (WCDMA) communication system, time-division code division multiple access (TD-SCDMA) communication system, long-term evolution (long-term evolution) term evolution (LTE) communication system, fifth generation (5th Generation, 5G) communication system (such as next generation wireless (next radio, NR) system), future communication system, etc.
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • TD-SCDMA time-division code division multiple access
  • LTE long-term evolution
  • 5G fifth generation
  • the terminal device is a device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device built into the above-mentioned devices (such as , communication module, modem, or chip system, etc.).
  • the terminal device is used to connect people, things, machines, etc., and can be widely used in various scenarios, including but not limited to the following scenarios: cellular communication, device-to-device communication (device-to-device, D2D), car-to-everything (vehicle to everything, V2X), machine-to-machine/machine-type communications (machine-to-machine/machine-type communications, M2M/MTC), Internet of things (Internet of things, IoT), virtual reality (virtual reality, VR) , augmented reality (augmented reality, AR), industrial control (industrial control), unmanned driving (self driving), telemedicine (remote medical), smart grid (smart grid), smart furniture, smart office, smart wear, smart transportation , smart city (smart city), drones, robots, etc.
  • cellular communication device-to-device communication
  • D2D device-to-device, D2D
  • car-to-everything vehicle to everything
  • V2X machine-to-machine/
  • the terminal equipment may sometimes be referred to as user equipment (user equipment, UE), terminal, access station, UE station, remote station, wireless communication device, or user device, etc.
  • user equipment user equipment
  • UE user equipment
  • access station UE station
  • remote station wireless communication device
  • wireless communication device or user device, etc.
  • the terminal device is taken as an example for description.
  • the network equipment in this embodiment of the present application may include one or more of the following: access network equipment, core network equipment, or a server set up by an operator.
  • the network device can also be a server, a wearable device, or a vehicle-mounted device, etc.
  • a network device in a vehicle to everything (V2X) technology may be a road side unit (RSU).
  • the access network device is a device with a wireless transceiver function, and is used for communicating with a terminal device.
  • the access network equipment includes, but is not limited to, the base station (BTS, Node B, eNodeB/eNB, or gNodeB/gNB), the transmission reception point (transmission reception point, TRP), and the third generation partnership project (3rd generation partnership project) in the above-mentioned communication system.
  • Generation Partnership Project, 3GPP 3GPP subsequent evolution base station, access node, wireless relay node, wireless backhaul node in wireless fidelity (Wireless Fidelity, Wi-Fi) system, etc.
  • the base station may be: a macro base station, a micro base station, a pico base station, a small station, a relay station, and the like. Multiple base stations may support the aforementioned networks of the same access technology, or may support the aforementioned networks of different access technologies.
  • a base station may contain one or more co-sited or non-co-sited transmission and reception points.
  • the network device may also be a wireless controller, a centralized unit (centralized unit, CU), and/or a distributed unit (distributed unit, DU) in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • the base station is used as an example for the access network device to be described.
  • the base station can communicate with the terminal equipment, and can also communicate with the terminal equipment through the relay station.
  • a terminal device can communicate with multiple base stations in different access technologies.
  • the core network equipment is used to implement functions such as mobility management, data processing, session management, policy and charging.
  • functions such as mobility management, data processing, session management, policy and charging.
  • the names of devices implementing core network functions in systems with different access technologies may be different, which is not limited in this embodiment of the present application.
  • the core network equipment includes: access and mobility management function (access and mobility management function, AMF), session management function (session management function, SMF), user plane function (user plane function, UPF ) or policy control function (policy control function, PCF), etc.
  • AMF access and mobility management function
  • SMF session management function
  • user plane function user plane function
  • UPF user plane function
  • policy control function policy control function
  • PCF policy control function
  • the SMF is responsible for session management, execution of PCF delivery control policies, UPF selection, terminal Internet Protocol (internet protocol, IP) address allocation and other functions.
  • UPF is responsible for user plane data forwarding, session/flow-based accounting statistics, bandwidth limitation and other functions.
  • the server set up by the operator can be used to manage one or more types of terminal devices.
  • IoT device manager IoT device manager
  • IoT device manager as a server set up by the operator, can manage the IoT devices covered by the operator. .
  • the public land mobile network (PLMN) in the embodiment of the present application is a network established and operated for the purpose of providing land mobile communication services for the public, and the network is usually interconnected with the public switched telephone network (PSTN) to form a A communication network on a regional or national scale.
  • PLMN identification includes mobile country code (mobile country code, MCC) and mobile network code (mobile network code, MNC).
  • MCC mobile country code
  • MNC mobile network code
  • the CAG in the embodiment of this application refers to a network function introduced to provide non-public network (non-public network, NPN) services only for authorized terminal devices, and to prevent unauthorized terminal devices from accessing and selecting NPN.
  • NPN non-public network
  • the CAG to which the authorized terminal device belongs may be pre-configured, so that the NPN service may be provided to the terminal device belonging to one or some CAGs according to the CAG to which the terminal device belongs.
  • a CAG can provide services for one or more terminal devices; from the perspective of a terminal device, a terminal device can belong to one or more CAGs, and access the network through any one of the CAGs it belongs to.
  • a CAG information list may be stored in the terminal device a, and the CAG information list includes identifiers of one or more CAGs to which the terminal device a belongs.
  • the identifier of the CAG may be an identifier (identifier, ID) of the CAG or other information, which is not specifically limited.
  • a cell may be associated with a CAG in advance.
  • a cell associated with a CAG may be called a CAG cell or a private network cell, and a cell not associated with the CAG may be called a non-CAG cell or a public network cell.
  • a CAG can be associated with one or more cells.
  • a cell may also be associated with one or more CAGs, and the cell may broadcast PLMN information and the identities of one or more CAGs associated with it.
  • nouns for the number of nouns, unless otherwise specified, it means “singular noun or plural noun", that is, “one or more". “At least one” means one or more, and “plurality” means two or more. "And/or” describes the association relationship of associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character “/" generally indicates that the contextual objects are an "or” relationship. For example, A/B means: A or B. “At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items.
  • At least one item (piece) of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c Can be single or multiple.
  • first and second mentioned in this embodiment of the application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority, or importance of multiple objects.
  • first network and the second network may be the same network or different networks, and this name does not indicate the location, corresponding parameters, priority or importance of the two networks, etc. different.
  • numbering of the steps in the various embodiments introduced in this application is only for distinguishing different steps, and is not used to limit the order of the steps.
  • FIG. 1 exemplarily shows a network architecture of a communication system to which the embodiment of the present application is applicable.
  • the communication system includes a terminal device 110, an access network device 120, and a core network device (for example, AMF 130).
  • the communication system is a communication system that supports CAG private network.
  • Access network equipment can provide services for terminal equipment through covered private network cells and/or public network cells, so that it can be used in various vertical industries (such as enterprise parks, factories, schools, etc.) etc.) are widely used in scenarios.
  • the NAS layer and the AS layer of the terminal device can interact to complete the network search process, so as to realize the camping in a certain cell.
  • the NAS layer of the terminal device is responsible for selecting a PLMN and passing the information of the selected PLMN to the AS layer;
  • the AS layer of the terminal device is responsible for searching for the cell of the selected PLMN, such as a private network cell and/or Public network area.
  • the NAS layer of the terminal device may trigger the selection of a PLMN in the following two situations: The first case is power-on or moving from an uncovered area to a covered area. After the coverage state is restored, it is necessary to find a suitable PLMN to access.
  • the second case is a periodic network selection attempt.
  • the terminal device needs to perform a periodic search to determine whether there is a PLMN with a higher priority. This case is mainly for the roaming scenario when returning from a roaming network to a home network.
  • the AS layer of the terminal device can scan the network signal on some frequency bands and frequency points, solve the cell broadcast, and judge whether it meets the residence threshold of the cell according to the read broadcast information of the cell to determine whether it can be successfully camped. Stay in the area.
  • the AS layer of the terminal device may also send a cell-camp system message to the NAS layer of the terminal device to indicate camping on a certain cell.
  • the NAS layer of the terminal device can initiate a registration process of the terminal device to complete the registration with the network. For example, the terminal device may send a registration request message to the AMF through the access network device, and receive a registration acceptance message from the AMF.
  • FIG. 2 and FIG. 3 exemplarily show two possible application scenarios of the embodiment of the present application.
  • the communication system can provide public network services for private network users. Specifically, there is no public network coverage within the enterprise campus, or there is public network coverage but private network UEs are only allowed to access through the private network in the campus. In this scenario, private network UEs sometimes still need to enjoy public network services. For example, Voice Service.
  • the production equipment UE A needs to call the administrator UE B; for another example, data service (Data Service), the vehicle UE B drives out of the private network of the park, and UE A can track the logistics status of UE B in real time.
  • Data Service data service
  • public network users in the communication system can remotely control private network devices.
  • a private network NPN is deployed in the smart farm, and all monitoring, irrigation, pest control and other equipment can only be connected to the private network.
  • the farmer (UE A) accesses through the public network at the remote end to check the growth of the crops and adjust the water speed of the irrigation equipment.
  • the embodiment of the present application provides a network search method, which can be set by setting a suitable search network for the terminal equipment.
  • Network mode to achieve fast access to public network or private network, or fast switching between private network and public network, so as to meet the business needs of various terminal devices.
  • FIG. 4 exemplarily shows a method for searching a network provided by an embodiment of the present application.
  • the method is applied to a terminal device, and the terminal device can support a private network and a public network, that is, a private network cell and a public network cell.
  • the method includes:
  • Step 401 the terminal device acquires a network search mode, and the network search mode is one of a private network mode, a public network mode and a private network priority mode.
  • the private network mode means that the terminal device only tries to camp in a private network cell
  • the public network mode means that the terminal device only tries to camp in a public network cell
  • the private network priority mode means that the terminal device can preferentially try to camp in a private network cell. If you cannot successfully camp in a private network cell (for example, no qualified private network cell can be found), try to camp in a public network cell. In this way, for terminal devices (such as IOT devices such as electric meters and water meters) whose active area is only in the private network coverage area or only has private network coverage but no mobility, you can configure the private network mode for them, so that such terminal devices can only Can access the network through the private network.
  • IOT devices such as electric meters and water meters
  • terminal devices that do not require private network access or do not support private networks you can configure the public network mode for them, so that such terminal devices can only access the network through the public network.
  • terminal devices that require both private network and public network access and have a certain degree of mobility (such as food delivery trucks in parks, mining vehicles, etc.)
  • you can configure the private network priority mode for them so that such terminal devices can be prioritized through Private network access network.
  • the subscriber identity module (subscriber identity module, SIM) card or non-volatile memory (non-volatile memory, NV) of the terminal device may be preset with the information of the network search mode supported by the terminal device, and the terminal device
  • the network search mode can be obtained by reading the network search mode information stored in the SIM card or NV.
  • the SIM card or NV of the terminal device can be preset with information of multiple search modes.
  • the user can select the menu through the search mode displayed on the user interface, Select the currently effective network search mode from the preset multiple network search modes, so that the network search mode actually adopted by the terminal device can be flexibly and dynamically adjusted according to user needs.
  • the search mode selection menu can display the selection buttons corresponding to the various preset search modes. The user can click the selection button or perform other touch operations to select one of the search modes, and click to confirm. Enable this search mode to take effect.
  • the terminal device can acquire the web search mode selected by the user by detecting the user's touch operation on a selection button in the web search mode selection menu displayed on the user interface.
  • Step 402 the terminal device camps in a private network cell or a public network cell or switches between a public network cell and a private network cell according to the network search mode.
  • the terminal device can reside in the private network through cell search. Specifically, the terminal device can select a PLMN that supports CAG among the PLMNs of the first communication standard according to the priority order of each PLMN in the PLMN list, and the network of the first communication standard supports the CAG function; If the private network cell supporting the selected PLMN is found, and the CAG associated with the private network cell is the CAG supported by the terminal device, then camp on the private network cell. Afterwards, the terminal device can also send a registration request message to the AMF network element to trigger the registration process.
  • the registration request message includes first indication information, and the first indication information is used to indicate that the terminal device supports the CAG capability.
  • the non-access stratum (non-access stratum, NAS) of the terminal device may select the PLMN supporting the first communication standard according to the priority order of each PLMN in the PLMN list.
  • the PLMN of the CAG and then in step 502, the information of the selected PLMN is sent to the access stratum (access stratum, AS) of the terminal device, and the network of the first communication standard supports the CAG function.
  • the AS of the terminal device can perform a cell search.
  • the terminal device AS can successfully camp in the private network cell.
  • the S criterion is a condition for judging whether a cell can camp during the cell search process, which means that only cells that meet the corresponding signal strength and quality requirements can camp.
  • the AS of the terminal device may send a camped-on cell system message to the NAS of the terminal device, and the camped-on cell system message includes identification information of the private network cell to indicate to camp on the private network cell.
  • the NAS of the terminal device can initiate a registration process, and send a registration request (register request) message to the AMF network element in the core network, and the registration request message includes first indication information, and the first indication information is used to indicate
  • the terminal device supports the CAG capability, and optionally, the first indication information may also indicate that the terminal device supports a network of the first communication standard.
  • the NAS of the terminal device selects a PLMN, it may preferentially select a PLMN that supports CAG among PLMNs of the first communication standard with a higher priority according to the priority order of the PLMNs in the PLMN list from high to low.
  • the network of the first communication standard supports the CAG function, for example, it may be a 5G NR network.
  • a PLMN supporting CAG refers to a PLMN associated with identification information of one or more CAGs in a CAG information list (CAG information list) of a terminal device.
  • the CAG information list may be issued by the network, or pre-configured in the SIM card or NV of the terminal device, and is not limited.
  • the AS of the terminal device when it performs cell search, it can select a PLMN that supports the selection from the searched cells, while satisfying the S criterion, and the associated CAG resides in a private network cell of the CAG supported by the terminal device. Specifically, when a certain cell is found, the AS of the terminal device may first judge whether the cell satisfies the S criterion according to the signal strength and signal quality of the cell. If the S criterion is met, the cell broadcast of the cell is further decoded to determine whether the cell is a CAG cell.
  • CAG cell If it is a CAG cell, continue to judge whether the CAG identification information broadcast by the cell is in the CAG information list of the terminal device (that is, judge whether the CAG associated with the cell is a CAG supported by the terminal device). If it is in the CAG information list of the terminal device, the terminal device resides successfully; otherwise, the residency fails.
  • the terminal device when the terminal device moves to an area covered by the private network, or the current area When there is private network coverage again, the terminal device will continue to reside in the private network cell to provide services. During this period, the terminal device can try to reside in the private network cell at intervals, and will not try to reside in the public network cell.
  • the terminal device can reside on the public network by means of cell search. Specifically, the terminal device can select a PLMN that only supports CAG among the PLMNs of the first communication standard according to the priority order of each PLMN in the PLMN list, or select a PLMN of the second communication standard, and the network of the first communication standard supports CAG function, the network of the second communication standard does not support the CAG function. Then, the terminal device may perform cell search in the selected PLMN, and if a public network cell supporting the selected PLMN is found, camp on the public network cell. Afterwards, the terminal device can also send a registration request message to the AMF network element to trigger the registration process.
  • the registration request message includes second indication information, where the second indication information is used to indicate that the terminal device does not support the CAG capability.
  • the NAS of the terminal device may select a PLMN of the first communication standard that does not only support CAG (that is, non-CAG only) according to the priority order of each PLMN in the PLMN list.
  • PLMN or select the PLMN of the second communication standard, and then send the information of the selected PLMN to the AS of the terminal device in step 602, and the AS of the terminal device performs cell search.
  • the network of the first communication standard supports the CAG function
  • the network of the second communication standard does not support the CAG function.
  • step 603 if the AS of the terminal device searches for a public network cell that supports the selected PLMN and satisfies the S criterion, the AS of the terminal device can successfully camp on the public network cell.
  • the AS of the terminal device may send a camped-on cell system message to the NAS of the terminal device, and the camped-on cell system message includes identification information of the public network cell to indicate to camp on the public network cell.
  • the NAS of the terminal device can initiate a registration process, and send a registration request (register request) message to the AMF network element in the core network, and the registration request message includes second indication information, and the second indication information is used to indicate The terminal device does not support the CAG capability.
  • the network search mode is the public network mode
  • the network of the first communication standard since the network of the first communication standard supports the CAG function, the network of the second communication standard does not support the CAG function, therefore, when the NAS of the terminal device selects the PLMN, it can select the second
  • the PLMN of the second communication standard may also select the PLMN of the first communication standard.
  • the PLMN of the second communication standard it should be selected that the PLMN that does not support CAG, or the PLMN that supports CAG but not CAG only (limited to only support CAG).
  • the network device of the first communication standard may be, for example, a 5G NR network
  • the network of the second communication standard may be, for example, a 2G, 3G or 4G network.
  • the AS of the terminal device may select a public network cell that supports the selected PLMN and satisfies the S criterion from the searched cells to camp on. Specifically, when a certain cell is found, the AS of the terminal device may first judge whether the cell satisfies the S criterion according to the signal strength and signal quality of the cell. If the S criterion is met, the cell broadcast of the cell is further decoded to determine whether the cell is a CAG cell. If it is a non-CAG cell, the camping is successful; otherwise, the camping fails.
  • the terminal device can continue to reside in the public network cell to provide services. During this period, the terminal device can try to reside in the public network cell at intervals, and will not try to reside in the private network cell.
  • the terminal device can return to the private network cell to reside in by cell search.
  • the terminal device may select a PLMN that supports CAG among the PLMNs of the first communication standard, the network of the first communication standard supports the CAG function, and the first timer is configured to
  • the device is currently residing in a public network cell and the obtained network search mode is the private network priority mode, it is turned on, and the duration of the first timer is determined according to the number of times the first timer is started; then, the terminal device can be in the selected Perform a cell search in the PLMN.
  • the private network cell is camped and the first timer is started. The number of times is cleared. If no private network cell supporting the selected PLMN is found, or the CAG associated with the searched private network cell is not a CAG supported by the terminal device, restart the first timer.
  • step 701 the terminal device currently resides in a public network cell of an EHPLMN, and if the obtained network search mode is the private network priority mode, the NAS of the terminal device can start the first timer.
  • the NAS of the terminal device may send a start notification to the first timer, where the start notification includes indication information for indicating start of the first timer and the duration of the first timer.
  • the NAS of the terminal device may receive a timeout notification from the first timer.
  • the duration of the first timer may be determined according to the current number of starts of the first timer. For example, in the initial state shown in step 701, the number of starts of the first timer is 0 times. Before starting the first timer, the NAS of the terminal device may determine this The duration of the first timer can be a preset value. After the first timer is started, the NAS of the terminal device can add 1 to the start times of the first timer, after that, when the first timer is started again, the duration of the first timer can be determined according to the incremented start times , for example, may be greater than or equal to the duration when the first timer was started last time, and so on.
  • the duration of the first timer can gradually increase according to a linear or stepwise rule as the number of starts increases, that is, the more the number of starts, the longer the duration of the first timer .
  • a correlation coefficient may be set, and the duration of the first timer is obtained each time the first timer is started by multiplying the number of starts of the first timer by the number of times of correlation.
  • several threshold values for the number of starts can be set, and the number of starts can be divided into corresponding intervals by the several thresholds.
  • the duration of the first timer in each interval is the same, and the duration of different intervals varies with time.
  • the number of starts increases stepwise, and the duration of the first timer can be determined according to which interval the current number of starts of the first timer falls in.
  • the NAS of the terminal device can select an EHPLMN of the first communication standard and supports CAG, and in step 705, send the information of the selected EHPLMN to the AS of the terminal device.
  • the network of the communication standard supports the CAG function, for example, it may be NR.
  • the AS of the terminal device can perform a cell search. If a private network cell that supports the selected EHPLMN and satisfies the S criterion is found, and the CAG associated with the private network cell is the CAG supported by the terminal device, then the terminal successfully camps on the cell. private community.
  • the AS of the terminal device may send a cell camping system message to the NAS of the terminal device, and the cell camping system message may include identification information of the private network cell to indicate that the private network cell is camped network area.
  • the NAS of the terminal device may reset the number of times of starting the first timer, and clear the number of times of starting the first timer to zero.
  • the AS of the terminal device may send a system message of camping failure to the NAS of the terminal device to Indicates that the terminal device failed to camp. Thereafter, the NAS of the terminal device may restart the first timer. After the first timer expires, the NAS of the terminal device can re-trigger the PLMN selection and cell search process, and try to return to the private network cell to camp on again until the camping is successful.
  • the terminal device when the terminal device initiates service access, it can indicate a different cell index through the IEselectedPLMN-Identity information element in the RRCSetupComplete message of the air interface, which is determined by The AMF network element distinguishes whether the terminal device accesses a private network cell or a public network cell. If the terminal equipment is from the public network of different PLMNs or TA areas to the private network, the terminal equipment can notify the AMF through a registration request message when initiating mobility registration.
  • different PLMNs are carried in the register request message of the air interface, and different cell indexes are also indicated through IEselectedPLMN-Identity in the RRCSetupComplete message, and the AMF network element distinguishes whether the terminal device accesses a private network cell or a public network cell.
  • the terminal device can return to the private network cell to reside in the private network cell through cell reselection. Specifically, the terminal device is currently camping on the public network cell of the first PLMN, and if the signal measurement information of the public network cell where the terminal device is currently camping is worse than the set threshold, the terminal device can obtain one or more information of the public network cell. The signal measurement information of the neighboring cell; then, according to the signal measurement information of the one or more neighboring cells, select the private network cell supporting the first PLMN or the equivalent PLMN of the first PLMN from the one or more neighboring cells. If the private network cell does not exist, the terminal device may choose to camp in a public network cell that supports the first PLMN or an equivalent PLMN of the first PLMN.
  • the terminal device currently resides in a public network cell of a first PLMN, and the first PLMN may be one of a home PLMN, a home equivalent PLMN, or a visited PLMN.
  • the AS of the terminal device can acquire signal measurement information of one or more neighboring cells of the public network cell where it currently resides.
  • the one or more neighboring cells may be pre-configured by the network, and the signal measurement information may include reference signal receiving power (reference signal receiving power, RSRP), reference signal receiving quality (reference signal receiving quality, RSRQ), etc. used to characterize the cell Parameters for signal reception.
  • the AS of the terminal device may select a private network cell that supports the first PLMN or an equivalent PLMN of the first PLMN and satisfies the R criterion from the above-mentioned one or more neighboring cells according to the measurement results.
  • the R criterion is a criterion that the terminal equipment applies between adjacent cells of the same frequency or different frequencies with the same priority when performing cell reselection, which means that only the R value of the neighboring cell is greater than the R value of the serving cell, and lasts for a certain period of time. , cell reselection will occur.
  • QHyst is the cell reselection hysteresis, which is used to prevent ping-pong.
  • the R value of the neighboring cell Rn Qmeas,n–CellQoffset, Qmeas,n is the neighboring cell RSRP, and CellQoffset is the cell reselection offset, which is used to control easy or difficult reselection.
  • Each energy value mentioned above can be obtained by the terminal device reading the cell broadcast.
  • the AS of the terminal device may choose to camp in a public network cell that supports the first PLMN or an equivalent PLMN of the first PLMN and satisfies the R criterion.
  • the AS of the terminal device may send a camped-on cell system message to the NAS to indicate the private network cell or public network cell to camp on.
  • step 805 if there is neither a private network cell satisfying the condition nor a public network cell satisfying the condition in the above-mentioned one or more neighboring cells, the AS of the terminal device may determine that the camping fails, and sends a lost message to the NAS. Net instructions. Thereafter, in step 806, the NAS of the terminal device may re-select the PLMN according to the process of searching for a lost network. For the lost-net search process, reference may be made to the relevant description of the embodiment shown in FIG. 6 , and details are not repeated here.
  • the terminal device can Returns high-priority PLMN cells to camp in by means of cell search, and preferentially camps in private network cells. Specifically, the terminal device can periodically determine whether there is a high-priority PLMN available at present, and if there is a high-priority PLMN available, then select the currently available PLMN with the highest priority; Perform cell search in the PLMN with the highest priority.
  • the NAS of the terminal device can follow the (equivalent) home PLMN -> user control PLMN -> operator control PLMN -> access PLMN In order, construct a list of candidate PLMNs.
  • the NAS of the terminal device may periodically determine whether there is a high-priority PLMN available, for example, according to the priority order of each PLMN in the candidate PLMN list judge.
  • step 902 if there is a high-priority PLMN available, the NAS of the terminal device may select the currently available PLMN with the highest priority, and in step 903, send the information of the selected PLMN to the AS of the terminal device.
  • the AS of the terminal device can perform a cell search. If a private network cell that supports the currently available PLMN with the highest priority and meets the S criterion is found, and the CAG associated with the private network cell is supported by the terminal device CAG, reside in the private network cell. Otherwise, in step 905, if a public network cell that supports the selection and currently available with the highest priority PLMN and satisfies the S criterion is found, camp on the public network cell. Further, in step 906, the AS of the terminal device may send a camping cell system message to the NAS of the terminal device to indicate the private network cell or the public network cell where the terminal device resides.
  • the high-priority PLMN refers to a PLMN with a higher priority than the currently resident visiting PLMN, for example, it may be a (equivalent) home PLMN, a user-controlled PLMN, or an operator-controlled PLMN. If multiple high-priority PLMNs are available, the NAS of the terminal device may select the PLMN with the highest priority according to the priority order of each PLMN in the candidate PLMN list. For example, as shown in FIG. 10 , after the periodic high-priority network search process starts, the terminal device may first determine whether there is currently an (equivalent) home PLMN available according to the priority order of each PLMN in the candidate PLMN list.
  • no user-controlled PLMN is available, then it is judged whether there is currently an operator-controlled PLMN available. If there is an operator-controlled PLMN available, select the cell of the operator-controlled PLMN to camp in, and preferentially camp in a private network cell that meets the conditions. If no private network cell that meets the conditions can be found, it will camp in a public network cell. If there is no operator-controlled PLMN available, choose to continue to stay in the cell of the current access PLMN.
  • the setting and switching of the search mode can be performed through the search mode selection menu.
  • the network search mode supported by the terminal device can be preset in the SIM card or NV of the terminal device. In this way, the terminal device can quickly access services provided by the public network or private network based on the network search mode, or quickly switch between the public network and the private network, while reducing the power consumption of the terminal device.
  • FIG. 11 exemplarily shows a communication device provided by an embodiment of the present application.
  • the communication device can be used to implement functions corresponding to the terminal device in the above method embodiment.
  • the communication device supports public networks and private networks.
  • the communication device may be a terminal device, or a chip or a circuit included in the terminal device, or a device including the terminal device, such as various types of vehicles.
  • the communication device 1100 includes: a transceiver module 1110 and a processing module 1120 .
  • the communication device executes the operations or steps corresponding to the terminal equipment in the method embodiment shown in FIG.
  • the processing module 1120 is specifically configured to: select a PLMN that supports CAG among PLMNs of the first communication standard according to the priority order of each PLMN in the PLMN list.
  • the network of a communication standard supports the CAG function; perform a cell search in the selected PLMN, if a private network cell supporting the selected PLMN is found, and the CAG associated with the private network cell is the CAG supported by the communication device, then reside in the private community.
  • the transceiver module 1110 is configured to: send a registration request message to an access and mobility management function network element, where the registration request message includes first indication information, and the first indication information is used to indicate that the communication The device supports CAG capability.
  • the processing module 1120 is specifically configured to: select a PLMN that does not only support CAG among the PLMNs of the first communication standard according to the priority order of each PLMN in the PLMN list , or select the PLMN of the second communication standard, the network of the first communication standard supports the CAG function, and the network of the second communication standard does not support the CAG function; perform cell search in the selected PLMN, if a PLMN supporting the selection is found public network cell, reside in the public network cell.
  • the transceiver module 1110 is configured to: send a registration request message to an access and mobility management functional network element, where the registration request message includes second indication information, and the second indication information is used to indicate that the communication The device does not support CAG capability.
  • the processing module 1120 is specifically configured to: select the first communication mode when the first timer expires.
  • the PLMN that supports CAG the PLMN that supports CAG
  • the network of the first communication standard supports the CAG function
  • the first timer is configured as when the communication device currently resides in a public network cell and the obtained network search mode is the private network priority mode Enabled under normal circumstances; perform cell search in the selected PLMN, if a private network cell supporting the selected PLMN is found, and the CAG associated with the private network cell is the CAG supported by the communication device, then camp on the private network cell.
  • the duration of the first timer is determined according to the number of starts of the first timer.
  • the processing module 1120 is further configured to: after camping on the private network cell, clear the number of starts of the first timer to zero.
  • the processing module 1120 is further configured to: if no private network cell supporting the selected PLMN is found, or the CAG associated with the searched private network cell is not a CAG supported by the communication device, restart the first a timer.
  • the processing module 1120 is specifically configured to: if the public network cell where the terminal device currently resides The signal measurement information of the public network cell is worse than the set threshold, and the signal measurement information of one or more neighboring cells of the public network cell is obtained; according to the signal measurement information of the one or more neighboring cells, select from the one or more neighboring cells Camp in a private network cell that supports the first PLMN or an equivalent PLMN of the first PLMN. If the private network cell does not exist, select a public network cell that supports the first PLMN or an equivalent PLMN of the first PLMN to camp on.
  • the processing module 1120 is specifically configured to: periodically determine whether there is currently a high-priority PLMN available, If there is a high-priority PLMN available, select the currently available highest-priority PLMN; perform cell search in the currently available highest-priority PLMN, if a private network supporting the currently available highest-priority PLMN is found cell, and the CAG associated with the private network cell is the CAG supported by the communication device, then camp in the private network cell; network area.
  • the processing module 1120 is specifically configured to: obtain the network search mode by reading the preset network search mode information in the SIM card or non-volatile memory; or, by detecting that the user acts on the user interaction
  • the touch operation of the selection button corresponding to the network search mode in the network search mode selection menu on the interface obtains the network search mode selected by the user.
  • the network search mode selection menu includes private network mode, public network mode and private network priority The selection buttons corresponding to the modes respectively.
  • the processing module 1120 involved in the communication device may be implemented by at least one processor or processor-related circuit components, and the transceiver module 1110 may be implemented by at least one transceiver or transceiver-related circuit components or a communication interface.
  • the operations and/or functions of the modules in the communication device are respectively for implementing the corresponding processes of the methods shown in FIG. 4 to FIG. 10 , and for the sake of brevity, details are not repeated here.
  • the communication device may further include a storage module, which may be used to store data and/or instructions, and the transceiver module 1110 and/or the processing module 1120 may read the data and/or program instructions in the access module , so that the communication device implements the corresponding method.
  • the storage module can be implemented, for example, by at least one memory.
  • the above-mentioned storage module, processing module and transceiver module may exist separately, or may be integrated in whole or in part, such as integration of a storage module and a processing module, or integration of a processing module and a transceiver module.
  • Fig. 12 exemplarily shows another communication device provided by the embodiment of the present application, which can be used to realize the functions corresponding to the terminal device in the above method embodiment, and the communication device supports public network and private network.
  • the communication device may be a terminal device, or a chip or a circuit included in the terminal device, or a device including the terminal device, such as various types of vehicles.
  • the communication device 1200 may include a processor 1201 and a memory 1202 .
  • the memory 1202 is used to store program instructions and/or data
  • the processor 1201 is used to execute the program instructions stored in the memory 1202, so as to implement the methods in the above method embodiments.
  • the memory 1202 is coupled to the processor 1201, and the coupling is an indirect coupling or a communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used between devices, units or modules information interaction.
  • the communication device 1200 may also include a communication interface 1203, which is used to communicate with other devices through a transmission medium, for example, to transmit received signals from other communication devices to the processor 1201, or from the processing The signal from device 1201 is transmitted to other devices.
  • the communication interface 1203 may be a transceiver, or an interface circuit, such as a transceiver circuit, a transceiver chip, and the like.
  • the communication interface 1203 may be specifically configured to execute the above-mentioned actions of the transceiver module 1110, and the processor 1201 may be specifically configured to execute the above-mentioned actions of the processing module 1120, which will not be repeated in this application.
  • the specific connection medium among the processor 1201, the memory 1202, and the communication interface 1203 is not limited in the embodiment of the present application.
  • the processor 1201, the memory 1202, and the communication interface 1203 are connected through the bus 1204.
  • the bus is represented by a thick line in FIG. 12, and the connection mode between other components is only for schematic illustration. , is not limited to this.
  • the bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 12 , but it does not mean that there is only one bus or one type of bus.
  • the embodiment of the present application also provides a chip system, including: a processor, the processor is coupled with a memory, and the memory is used to store programs or instructions, and when the programs or instructions are executed by the processor, the The chip system implements the method corresponding to the terminal device in any one of the above method embodiments.
  • processors in the chip system there may be one or more processors in the chip system.
  • the processor can be realized by hardware or by software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor may be a general-purpose processor implemented by reading software codes stored in a memory.
  • the memory can be integrated with the processor, or can be set separately from the processor, which is not limited in this application.
  • the memory can be a non-transitory processor, such as a read-only memory ROM, which can be integrated with the processor on the same chip, or can be respectively arranged on different chips.
  • the setting method of the processor is not specifically limited.
  • the chip system may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC), It can also be a central processing unit (central processor unit, CPU), it can also be a network processor (network processor, NP), it can also be a digital signal processing circuit (digital signal processor, DSP), it can also be a microcontroller (micro controller unit, MCU), and can also be a programmable logic device (programmable logic device, PLD) or other integrated chips.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • each step in the foregoing method embodiments may be implemented by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the method steps disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
  • the embodiment of the present application also provides a computer-readable storage medium, where program instructions are stored in the computer storage medium, and when the program instructions are executed by the communication device, the methods in the foregoing method embodiments are implemented.
  • the embodiment of the present application further provides a computer program product, which enables the methods in the above method embodiments to be implemented when the communication device reads and executes the computer program product.
  • An embodiment of the present application also provides a communication system, where the communication system includes a terminal device, an access network device, and a core network device.
  • processors mentioned in the embodiments of the present application may be a CPU, or other general-purpose processors, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.
  • a general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.
  • the memory mentioned in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories.
  • the non-volatile memory may be a read-only memory (read-only memory, ROM), a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, or a flash memory.
  • Volatile memory can be random access memory (RAM), which acts as external cache memory.
  • RAM random access memory
  • dynamic random access memory synchronous dynamic random access memory
  • double data rate synchronous dynamic random access memory enhanced synchronous dynamic Random access memory
  • synchronously linked dynamic random access memory synchronously linked dynamic random access memory
  • direct memory bus random access memory direct memory bus random access memory
  • the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components
  • the memory storage module
  • the disclosed systems, devices and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: various media capable of storing program codes such as U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk.

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Abstract

本申请公开了一种搜网方法及通信装置，该方法应用于终端设备，该终端设备支持私网和公网，该方法包括：终端设备获取搜网模式，该搜网模式为私网模式、公网模式和私网优先模式中的一种；终端设备根据该搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换。上述技术方案，可使得终端设备基于获取到的私网模式、公网模式和私网优先模式中的一种搜网模式，快速接入公网或私网提供的服务，或在公网与私网之间进行快速切换，同时降低终端设备的功耗。

Description

一种搜网方法及通信装置 技术领域
本申请涉及无线通信技术领域，尤其涉及一种搜网方法及通信装置。
背景技术
为解决5G 2B场景下指定的签约用户能接入授权的私网的问题，第三代合作伙伴计划(3rd generation partnership project，3GPP)引入了封闭访问组(closed information group，CAG)特性。
在实际应用中，终端设备可能在多种可能的网络环境下使用，例如仅存在公网覆盖的网络环境，或仅存在私网覆盖的网络环境，或公私网混合(即存在公网覆盖又存在私网覆盖)的网络环境等。然而，现有技术中对终端设备如何接入私网或公网并无显式的优选控制，终端设备是接入私网还是公网，主要取决于当前环境下公网或私网的覆盖情况，因此，影响了终端设备的功耗和用户体验。例如，对于支持CAG的终端设备，用户无法选择仅在私网上尝试以及从公网上快速切换到私网上驻留；对于不支持CAG的终端设备，用户无法锁定仅在公网上尝试驻留。
发明内容
本申请提供一种搜网方法及通信装置，用以对终端设备接入公网还是私网进行有效控制，使得不同业务需求的终端设备可以选择性的接入公网或私网，并且支持CAG的终端设备可以在公网和私网之间进行快速切换，从而降低终端设备的功耗，提升用户体验。
第一方面，本申请实施例提供一种搜网方法，该方法应用于终端设备，例如可以是终端设备整机，也可以是配置于终端设备中的芯片或电路等部件。所述终端设备支持私网和公网；该方法包括：终端设备获取搜网模式，该搜网模式为私网模式、公网模式和私网优先模式中的一种；终端设备根据搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换。
上述技术方案，可使得终端设备基于获取到的私网模式、公网模式和私网优先模式中的一种搜网模式，快速接入公网或私网提供的服务，或在公网与私网之间进行快速切换，同时降低终端设备的功耗。
在一种可能的设计中，若搜网模式为私网模式，所述终端设备根据搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换，包括：终端设备根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中支持CAG的PLMN，该第一通信制式的网络支持CAG功能；终端设备在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则终端设备驻留该私网小区。
在一种可能的设计中，该方法还包括：终端设备向接入与移动性管理功能网元发送注册请求消息，该注册请求消息中包括第一指示信息，该第一指示信息用于指示终端设备支持CAG能力。
上述技术方案，可使得在存在私网覆盖(包括仅存在私网覆盖，以及同时存在公网覆 盖和私网覆盖)的网络环境下，终端设备可通过小区搜索的方式驻留私网。
在一种可能的设计中，若搜网模式为公网模式，所述终端设备根据搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：终端设备根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中非限定仅支持CAG的PLMN，或者选择第二通信制式的PLMN，该第一通信制式的网络支持CAG功能，该第二通信制式的网络不支持CAG功能；终端设备在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的公网小区，则终端设备驻留该公网小区。
在一种可能的设计中，该方法还包括：终端设备向接入与移动性管理功能网元发送注册请求消息，该注册请求消息中包括第二指示信息，该第二指示信息用于指示终端设备不支持CAG能力。
上述技术方案，可使得在存在公网覆盖(包括仅存在公网覆盖，以及同时存在公网覆盖和私网覆盖)的网络环境下，终端设备可通过小区搜索的方式驻留公网。
在一种可能的设计中，若搜网模式为私网优先模式，且终端设备当前驻留在公网小区，所述终端设备根据搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：在第一定时器超时的情况下，终端设备选择第一通信制式的PLMN中支持CAG的PLMN，该第一通信制式的网络支持CAG功能；终端设备在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则终端设备驻留该私网小区；其中，所述第一定时器被配置为在终端设备当前驻留公网小区且获取到搜网模式为私网优先模式的情况下开启。
在一种可能的设计中，所述第一定时器的时长根据该第一定时器的启动次数确定。
在一种可能的设计中，在驻留私网小区后，该方法还包括：终端设备将第一定时器的启动次数清零。
在一种可能的设计中，该方法还包括：若未搜索到支持该选择的PLMN的私网小区，或者搜索到的私网小区关联的CAG不是终端设备支持的CAG，则终端设备重新启动第一定时器。
上述技术方案，可使得在存在公网覆盖和私网覆盖的网络环境下，终端设备可通过小区搜索的方式从公网返回私网。
在一种可能的设计中，若搜网模式为私网优先模式，且终端设备当前驻留在第一PLMN的公网小区，所述终端设备根据搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：若终端设备当前驻留的公网小区的信号测量信息差于设定阈值，终端设备获取该公网小区的一个或多个邻区的信号测量信息；终端设备根据该一个或多个邻区的信号测量信息，从该一个或多个邻区中选择支持第一PLMN或第一PLMN的等效PLMN的私网小区驻留，若不存在所述私网小区，终端设备选择支持第一PLMN或第一PLMN的等效PLMN的公网小区驻留。
上述技术方案，可使得在存在公网覆盖和私网覆盖的网络环境下，终端设备可通过小区重选的方式从公网返回私网。
在一种可能的设计中，若搜网模式为私网优先模式且终端设备当前驻留在访问PLMN的小区，所述终端设备根据搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：终端设备周期性地判断当前是否存在高优先级的PLMN可用，若存在高优先级的PLMN可用，终端设备选择当前可用的优先级最高的PLMN；终端设备在该 当前可用的优先级最高的PLMN中执行小区搜索，若搜索到支持该当前可用的优先级最高的PLMN的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则终端设备驻留该私网小区；否则，若搜索到支持该当前可用的优先级最高的PLMN的公网小区，则终端设备驻留该公网小区。
上述技术方案，可使得在存在公网覆盖和私网覆盖的网络环境下，终端设备可通过小区搜索的方式从访问PLMN返回高优先级的PLMN。
在一种可能的设计中，所述终端设备获取搜网模式，包括：终端设备通过读取SIM卡或非易失性存储器中预置的搜网模式信息，获取该搜网模式；或者，终端设备通过检测用户作用于用户交互界面上的搜网模式选择菜单中该搜网模式对应的选择按钮的触控操作，获取用户选择的该搜网模式，该搜网模式选择菜单中包括私网模式、公网模式和私网优先模式分别对应的选择按钮。
上述技术方案中，对于不支持用户交互界面的终端设备，可以在终端设备的SIM卡或NV中预置终端设备支持的搜网模式。对于支持用户交互界面的终端设备，可以通过搜网模式选择菜单进行搜网模式的设置和切换。
第二方面，本申请实施例提供一种通信装置，该通信装置可以具有实现上述第一方面中终端设备的功能，该通信装置可以为终端设备，也可以为终端设备中包括的芯片或电路。
上述通信装置的功能可以通过硬件实现，也可以通过硬件执行相应的软件实现，所述硬件或软件包括一个或多个与上述功能相对应的模块或单元或手段(means)。
在一种可能的设计中，该通信装置的结构中包括处理模块和收发模块，其中，处理模块被配置为支持该通信装置执行上述第一方面中终端设备相应的功能。收发模块用于支持该通信装置与其他通信设备之间的通信，例如当该通信装置为终端设备时，可向接入与移动性管理功能网元发送注册请求消息。该通信装置还可以包括存储模块，该存储模块与处理模块耦合，其中保存有通信装置必要的程序指令和数据。作为一种示例，处理模块可以为处理器，收发模块可以为收发器，存储模块可以为存储器，存储器可以和处理器集成在一起，也可以和处理器分离设置。
在另一种可能的设计中，该通信装置的结构中包括处理器，还可以包括存储器。处理器与存储器耦合，用于执行存储器中存储的程序指令，以使通信装置执行上述第一方面中的方法。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。当通信装置为终端设备时，该通信接口可以是收发器或输入/输出接口；当该通信装置为终端设备中包含的芯片时，该通信接口可以是芯片的输入/输出接口。可选地，收发器可以为收发电路，输入/输出接口可以是输入/输出电路。
第三方面，本申请实施例提供一种芯片系统，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储程序指令和数据，所述处理器用于通过电路或执行所述程序指令，使得如上述第一方面或第一方面的任一种可能的设计中的方法被实现。
可选地，该芯片系统还包括接口电路，该接口电路用于与所述处理器交互程序指令和数据。
可选地，该芯片系统中的处理器可以为一个或多个，该处理器可以通过硬件实现，也可以通过软件实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等。当通过软件实现时，该处理器可以是一个通用处理器，用于读取并执行存储器中存储的程序指令。
可选地，该芯片系统中的存储器也可以为一个或多个。该存储器可以与处理器集成在 一起，也可以和处理器分离设置。示例性的，存储器可以是非瞬时性处理器，例如只读存储器ROM，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上。
第四方面，本申请实施例提供一种计算机可读存储介质，该计算机可读存储介质中存储有程序指令，当该程序指令被通信装置执行时，使得如上述第一方面或第一方面的任一种可能的设计中的方法被实现。
第五方面，本申请实施例提供一种计算机程序产品，当通信装置读取并执行所述计算机程序产品时，使得如上述第一方面或第一方面的任一种可能的设计中的方法被实现。
第六方面，本申请实施例提供一种通信系统，该通信系统包括终端设备、接入网设备和核心网设备。
附图说明
图1为本申请实施例适用的一种通信系统的网络架构示意图；
图2和图3为本申请实施例的两种应用场景的示意图；
图4为本申请实施例中提供的一种搜网方法的流程示意图；
图5为本申请实施例中在搜网模式为私网模式的情况下，终端设备通过小区搜索的方式驻留私网的流程示意图；
图6为本申请实施例中在搜网模式为公网模式的情况下，终端设备通过小区搜索的方式驻留公网的流程示意图；
图7为本申请实施例中在搜网模式为私网优先模式的情况下，当前驻留在公网小区的终端设备，通过小区搜索的方式返回私网小区的流程示意图；
图8为本申请实施例中在搜网模式为私网优先模式的情况下，当前驻留在公网小区的终端设备，通过小区重选的方式返回私网小区的流程示意图；
图9为本申请实施例中在搜网模式为私网优先模式的情况下，当前驻留在访问PLMN的终端设备，通过小区搜索的方式返回高优先级PLMN的流程示意图；
图10为本申请实施例中终端设备进行周期性地高优先级搜网的流程示意图；
图11和图12为本申请实施例提供的一种通信装置的结构示意图。
具体实施方式
下面将结合附图，对本申请实施例作进一步地详细描述。
本申请实施例可以应用于移动通信系统，例如全球移动通讯系统(global system for mobile communications，GSM)、通用分组无线服务(general packet radio service，GPRS)通信系统、码分多址接入(code division multiple access，CDMA)通信系统、宽带码分多址(wideband code division multiple access，WCDMA)通信系统、时分码分多址(time-division code division multiple access，TD-SCDMA)通信系统、长期演进(long term evolution，LTE)通信系统、第五代(5th Generation，5G)通信系统(比如下一代无线(next radio，NR)系统)、未来的通信系统等。
以下，对本申请实施例中的部分用语或概念进行解释说明，以便于本领域技术人员理解。
本申请实施例中，终端设备是一种具有无线收发功能的设备，可以是固定设备，移动 设备、手持设备(例如手机)、穿戴设备、车载设备，或内置于上述设备中的无线装置(例如，通信模块，调制解调器，或芯片系统等)。所述终端设备用于连接人，物，机器等，可广泛用于各种场景，例如包括但不限于以下场景：蜂窝通信、设备到设备通信(device-to-device，D2D)、车到一切(vehicle to everything，V2X)、机器到机器/机器类通信(machine-to-machine/machine-type communications，M2M/MTC)、物联网(internet of things，IoT)、虚拟现实(virtual reality，VR)、增强现实(augmented reality，AR)、工业控制(industrial control)、无人驾驶(self driving)、远程医疗(remote medical)、智能电网(smart grid)、智能家具、智能办公、智能穿戴、智能交通、智慧城市(smart city)、无人机、机器人等。所述终端设备有时可称为用户设备(user equipment，UE)、终端、接入站、UE站、远方站、无线通信设备、或用户装置等等。为描述方便，本申请实施例中将终端设备以UE为例进行说明。
本申请实施例中的网络设备，可以包括如下一种或多种：接入网设备，核心网设备，或，运营商设置的服务器。网络设备还可以是服务器、可穿戴设备、或车载设备等。例如，车到一切(vehicle to everything，V2X)技术中的网络设备可以为路侧单元(road side unit，RSU)。
其中，接入网设备为具有无线收发功能的设备，用于与终端设备进行通信。所述接入网设备包括但不限于上述通信系统中的基站(BTS，Node B，eNodeB/eNB，或gNodeB/gNB)、收发点(transmission reception point，TRP)、第三代合作伙伴计划(3rd generation partnership project，3GPP)后续演进的基站、无线保真(wireless fidelity，Wi-Fi)系统中的接入节点、无线中继节点、无线回传节点等。所述基站可以是：宏基站，微基站，微微基站，小站，中继站等。多个基站可以支持上述提及的同一种接入技术的网络，也可以支持上述提及的不同接入技术的网络。基站可以包含一个或多个共站或非共站的传输接收点。网络设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、集中单元(centralized unit，CU)、和/或分布单元(distributed unit，DU)。以下对接入网设备以为基站为例进行说明。基站可以与终端设备进行通信，也可以通过中继站与终端设备进行通信。终端设备可以与不同接入技术中的多个基站进行通信。
所述核心网设备用于实现移动管理，数据处理，会话管理，策略和计费等功能。不同接入技术的系统中实现核心网功能的设备名称可以不同，本申请实施例并不对此进行限定。以5G系统为例，所述核心网设备包括：接入与移动性管理功能(access and mobility management function，AMF)、会话管理功能(session management function，SMF)、用户面功能(user plane function，UPF)或策略控制功能(policy control function，PCF)等。其中，AMF用于负责移动性管理、接入鉴权/授权，以及在终端与PCF间传递用户策略等功能。SMF用于负责会话管理、PCF下发控制策略的执行、UPF的选择、终端的互联网协议(internet protocol，IP)地址分配等功能。UPF作为和数据网络的接口，负责用户面数据转发、基于会话/流级的计费统计、带宽限制等功能。
运营商设置的服务器可以用于对某一类或多类终端设备进行管理，例如IoT设备管理器(IoT device manager)作为运营商设置的一种服务器，可对该运营商覆盖的IoT设备进行管理。
本申请实施例中的公共陆地移动网络(public land mobile network，PLMN)是以为公众提供陆地移动通信业务的目的而建立和经营的网络，该网络通常与公众交换电话网 (PSTN)互连，形成整个地区或国家规模的通信网。PLMN标识包括移动国家码(mobile country code，MCC)和移动网络码(mobile network code，MNC)，以PLMN标识为46000为例，MCC为460，表示中国；MNC为00，表示移动。对于同一个运营商来说，在不同的区域可以有不同的PLMN标识，例如，中国移动的PLMN标识可以有46000、46002、46007、46008，又例如，中国联通的PLMN标识为46001、46006、46009。
本申请实施例中的CAG是指为了仅为授权的终端设备提供非公共网络(non-public network，NPN)服务，避免非授权的终端设备接入和选择NPN，引入的一种网络功能。例如，可以预先配置授权的终端设备所属的CAG，如此，通过依据终端设备所属的CAG可以为属于某一或某些CAG中的终端设备提供NPN服务。从CAG的角度来说，一个CAG可以为一个或多个终端设备提供服务；从终端设备的角度来说，一个终端设备可以属于一个或多个CAG，通过所属的任一个CAG接入网络。示例性地，终端设备a中可以存储有CAG信息列表(list)，该CAG信息列表中包括终端设备a所属的一个或多个CAG的标识。CAG的标识可以是CAG的身份标识号(identifier，ID)或其他信息，具体不做限定。再例如，也可以预先将小区与CAG关联，与CAG关联的小区可称为CAG小区或私网小区，未与CAG关联的小区可称为非(non)CAG小区或公网小区。从CAG的角度来说，一个CAG可以与一个或多个小区关联。从小区的角度来说，一个小区也可以关联一个或多个CAG，小区可以广播PLMN信息以及其关联的一个或多个CAG的标识。
本申请实施例中，对于名词的数目，除非特别说明，表示“单数名词或复数名词”，即"一个或多个”。“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A,B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。例如，A/B，表示：A或B。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个)，表示：a,b,c,a和b,a和c,b和c,或a和b和c，其中a,b,c可以是单个，也可以是多个。
本申请实施例提及“第一”、“第二”等序数词是用于对多个对象进行区分，不用于限定多个对象的大小、内容、顺序、时序、优先级或者重要程度等。例如，第一网络和第二网络，可以是同一个网络，也可以是不同的网络，且，这种名称也并不是表示这两个网络的位置、对应的参数、优先级或者重要程度等的不同。另外，本申请所介绍的各个实施例中对于步骤的编号，只是为了区分不同的步骤，并不用于限定步骤之间的先后顺序。
图1示例性示出了本申请实施例适用的一种通信系统的网络架构，如图1所示，该通信系统包括终端设备110、接入网设备120和核心网设备(例如AMF 130)。该通信系统为支持CAG私网的通信系统，接入网设备可通过覆盖的私网小区和/或公网小区为终端设备提供服务，从而可以在各类垂直行业(如企业园区、厂区、学校等)的场景中广泛应用。
终端设备的NAS层和AS层可交互完成搜网流程，以实现在某一小区上的驻留。具体的，在搜网流程中，终端设备的NAS层负责选择PLMN，并将选择的PLMN的信息传递给AS层；终端设备的AS层负责搜索选择的PLMN的小区，例如私网小区和/或公网小区。终端设备的NAS层可能会在以下两种情况下触发选择PLMN：第一种情况为开机或从无覆盖区移动到有覆盖区，该情况可以理解为是终端设备在开机时或是在从缺乏覆盖的状态 恢复后，需要找到合适的PLMN接入。第二种情况为周期性选网尝试，终端设备需要进行周期性搜索，以确定是否有优先级更高的PLMN，该情况主要针对从漫游网络回到归属网络接入的漫游场景。终端设备的AS层可在一些频带(band)和频点上扫描网络信号，解小区广播，根据读取到的该小区的广播信息，判断是否符合该小区的驻留门限来决定能否成功驻留该小区。当成功驻留在某一小区后，终端设备的AS层还可向终端设备的NAS层发送驻留小区系统消息，以指示驻留在某一小区。进而，终端设备的NAS层可发起终端设备的注册流程，以完成到网络的注册。例如，终端设备可通过接入网设备向AMF发送注册请求消息，以及接收来自AMF的注册接受消息。
图2和图3示例性示出了本申请实施例两种可能的应用场景。如图2所示，通信系统可以为私网用户提供公网服务。具体的，企业园区范围内无公网覆盖，或者有公网覆盖但是私网UE在园区内仅允许通过私网接入。在该场景下，私网UE有时仍需要享受公网服务。例如，语音服务(Voice Service)。当夜间生产发生故障时，生产设备UE A需要电话通知管理员UE B；再例如，数据服务(Data Service)，车UE B驶出园区私网，UE A可以实时跟踪UE B的物流情况。
如图3所示，通信系统中的公网用户可以远程控制私网设备。具体的，智慧农场内部署一个私网NPN，所有监控、灌溉、除虫等设备均只能接入私网。农民(UE A)在远端通过公网接入，查看农作物的生长情况，并调节灌溉设备水速等。
为解决背景技术中所提到的无法对终端设备接入私网或公网进行有效控制的问题，本申请实施例提供一种搜网方法，该搜网方法可以通过为终端设备设置合适的搜网模式，实现快速接入公网或私网，或在私网与公网间进行快速切换，从而满足各类终端设备的业务需求。
图4示例性示出了本申请实施例提供的一种搜网方法，该方法应用于终端设备，该终端设备可支持私网和公网，也即支持私网小区和公网小区。如图4所示，该方法包括：
步骤401，终端设备获取搜网模式，该搜网模式为私网模式、公网模式和私网优先模式中的一种。
其中，私网模式是指终端设备仅尝试在私网小区驻留；公网模式是指终端设备仅尝试在公网小区驻留；私网优先模式是指终端设备可优先尝试在私网小区驻留，如果无法成功在私网小区驻留(例如搜索不到符合条件的私网小区)，再尝试在公网小区驻留。如此，对于活动区域仅在私网覆盖区域或仅有私网覆盖但无移动性的特点的终端设备(例如电表、水表等IOT设备)，可以为其配置私网模式，使得这类终端设备只能通过私网访问网络。对于没有私网接入需求或不支持私网的终端设备，可以为其配置公网模式，使得这类终端设备只能通过公网访问网络。对于同时有私网和公网接入的需求，有一定的移动性的终端设备(例如园区送餐车，矿车等)，可以为其配置私网优先模式，使得这类终端设备可以优先通过私网访问网络。
示例性地，终端设备的用户识别卡(subscriber identity module，SIM)卡或非易失性存储器(non-volatile memory，NV)中可预置有该终端设备支持的搜网模式的信息，终端设备可通过读取SIM卡或NV中存储的搜网模式信息获取搜网模式。
如果终端设备具有用户交互界面，该终端设备的SIM卡或NV中可以预置有多种搜网模式的信息，这种情况下，可以由用户通过用户交互界面上显示的搜网模式选择菜单，从 预置的多种搜网模式中选择当前生效的搜网模式，从而使得终端设备实际采用的搜网模式可以根据用户需求进行灵活动态的调整。例如，搜网模式选择菜单中可显示预置的多种搜网模式各自对应的选择按钮，用户可以点击选择按钮或执行其他触控操作，选择其中的一种搜网模式，并点击确认后，使该搜网模式生效。终端设备可通过检测用户作用于用户交互界面上显示的搜网模式选择菜单中某一选择按钮的触控操作，获取用户选择的搜网模式。
步骤402，终端设备根据搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换。
若获取到的搜网模式为私网模式，在存在私网部署的网络环境下，终端设备可通过小区搜索的方式驻留私网。具体的，终端设备可根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中支持CAG的PLMN，该第一通信制式的网络支持CAG功能；然后，终端设备可在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则驻留该私网小区。此后，终端设备还可向AMF网元发送注册请求消息，以触发注册流程。该注册请求消息中包第一指示信息，该第一指示信息用于指示终端设备支持CAG能力。
示例性地，如图5所示，在步骤501中，终端设备的非接入层(non-access stratum，NAS)可根据PLMN列表中各个PLMN的优先级顺序选择第一通信制式的PLMN中支持CAG的PLMN，然后在步骤502中将选择的PLMN的信息发送给终端设备的接入层(access stratum，AS)，该第一通信制式的网络支持CAG功能。在步骤503中，终端设备的AS可执行小区搜索，若搜索到支持所述选择的PLMN且满足S准则的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则终端设备的AS可成功驻留该私网小区。其中，S准则是在小区搜索过程中判断小区能否驻留的一个条件，表示只有满足相应信号强度和质量要求的小区才能驻留。在步骤504中，终端设备的AS可向终端设备的NAS发送驻留小区系统消息，该驻留小区系统消息中包括驻留的该私网小区的标识信息，以指示驻留该私网小区。在步骤505中，终端设备的NAS可发起注册流程，向核心网中的AMF网元发送注册请求(register request)消息，该注册请求消息中包括第一指示信息，该第一指示信息用于指示终端设备支持CAG能力，可选的，该第一指示信息还可指示终端设备支持第一通信制式的网络。
示例性地，终端设备的SIM卡或NV中可存储有PLMN列表，该PLMN列表中包括注册PLMN(registered PLMN，RPLMN)、归属PLMN(home PLMN，HPLMN)、等效归属PLMN(equivalent home PLMN，EHPLMN)、用户控制PLMN(user controlled PLMN，UPLMN)、运营商控制PLMN(operator controlled PLMN，OPLMN)等多类PLMN，且各类PLMN的优先级顺序从高到低依次为RPLMN>HPLMN＝EHPLMN>UPLMN>OPLMN。
如此，终端设备的NAS在选择PLMN时，可按照PLMN列表中的PLMN的优先级从高到低的顺序，优先选择优先级较高的第一通信制式的PLMN中支持CAG的PLMN。其中，该第一通信制式的网络支持CAG功能，例如可以是5G NR网络。支持CAG的PLMN是指，在终端设备的CAG信息列表(CAG information list)中与一个或多个CAG的标识信息关联的PLMN。该CAG信息列表可以是网络下发的，也可以是终端设备的SIM卡或NV中预配置的，并不限定。
进一步地，终端设备的AS在执行小区搜索时，可从搜索到的小区中选择支持所述选择的PLMN，同时满足S准则，并且关联的CAG为终端设备支持的CAG的私网小区驻留。 具体的，当搜索到某一小区时，终端设备的AS可首先根据该小区的信号强度和信号质量，判断该小区是否满足S准则。如果满足S准则，则进一步解码该小区的小区广播，判断该小区是否是CAG小区。如果是CAG小区，则继续判断该小区广播的CAG的标识信息是否在终端设备的CAG信息列表中(即判断该小区关联的CAG是否是终端设备支持的CAG)。如果在终端设备的CAG信息列表中，则终端设备驻留成功，否则驻留失败。
可选的，如果出现了驻留失败(可能是由于终端设备移出私网的覆盖区域，因而无法接入私网提供的服务)，后续当终端设备移动到有私网覆盖的区域，或当前区域重新有私网覆盖，则终端设备会继续驻留到私网小区提供服务，期间终端设备可间隔性尝试驻留私网小区，不会尝试驻留公网小区。
若获取到的搜网模式为公网模式，在存在公网部署的网络环境下，终端设备可通过小区搜索的方式驻留公网。具体的，终端设备可根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中非限定仅支持CAG的PLMN，或者选择第二通信制式的PLMN，该第一通信制式的网络支持CAG功能，该第二通信制式的网络不支持CAG功能。然后，终端设备可在选择的PLMN中执行小区搜索，若搜索到支持该述选择的PLMN的公网小区，则驻留该公网小区。此后，终端设备还可向AMF网元发送注册请求消息，以触发注册流程。该注册请求消息中包括第二指示信息，该第二指示信息用于指示终端设备不支持CAG能力。
示例性地，如图6所示，在步骤601中，终端设备的NAS可根据PLMN列表中各个PLMN的优先级顺序选择第一通信制式的PLMN中非限定仅支持CAG(即非CAG only)的PLMN，或者选择第二通信制式的PLMN，然后在步骤602中将选择的PLMN的信息发送给终端设备的AS，由终端设备的AS执行小区搜索。该第一通信制式的网络支持CAG功能，该第二通信制式的网络不支持CAG功能。在步骤603中，若终端设备的AS搜索到支持选择的PLMN且满足S准则的公网小区，则终端设备的AS可成功驻留该公网小区。在步骤604中，终端设备的AS可向终端设备的NAS发送驻留小区系统消息，该驻留小区系统消息中包括驻留的该公网小区的标识信息，以指示驻留该公网小区。在步骤605中，终端设备的NAS可发起注册流程，向核心网中的AMF网元发送注册请求(register request)消息，该注册请求消息中包括第二指示信息，该第二指示信息用于指示终端设备不支持CAG能力。
示例性地，当搜网模式为公网模式时，由于第一通信制式的网络支持CAG功能，第二通信制式的网络不支持CAG功能，因此，终端设备的NAS在选择PLMN时，可以选择第二通信制式的PLMN，也可以选择第一通信制式的PLMN。但是，在选择第二通信制式的PLMN时要注意，应选择不支持CAG的PLMN，或者支持CAG但不是CAG only(限定仅支持CAG)的PLMN。第一通信制式的网络设备例如可以是5G NR网络，第二通信制式的网络例如可以是2G、3G或4G网络等。
进一步地，终端设备的AS在执行小区搜索时，可从搜索到的小区中选择支持所述选择的PLMN且满足S准则的公网小区驻留。具体的，当搜索到某一小区时，终端设备的AS可首先根据该小区的信号强度和信号质量，判断该小区是否满足S准则。如果满足S准则，则进一步解码该小区的小区广播，判断该小区是否是CAG小区。如果是非CAG小区，则驻留成功，否则驻留失败。
如果出现了驻留失败(可能是由于终端设备移出公网的覆盖区域，因而无法接入公网提供的服务)，后续UE移动到有公网覆盖的区域或当前区域重新有公网覆盖，终端设备可继续驻留到公网小区提供服务，期间终端设备可间隔性尝试驻留公网小区，不会尝试驻留私网小区。
若获取到的搜网模式为私网优先模式，且终端设备当前驻留在公网小区，在公私网混合部署的网络环境下，终端设备可以通过小区搜索的方式返回私网小区驻留。具体的，终端设备在第一定时器超时的情况下，可选择第一通信制式的PLMN中支持CAG的PLMN，该第一通信制式的网络支持CAG功能，该第一定时器被配置为在终端设备当前驻留公网小区且获取到的搜网模式为私网优先模式的情况下开启，并且该第一定时器的时长根据第一定时器的启动次数确定；然后，终端设备可在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则驻留该私网小区，并将第一定时器的启动次数清零。若未搜索到支持该选择的PLMN的私网小区，或者搜索到的私网小区关联的CAG不是终端设备支持的CAG，则重新启动第一定时器。
示例性地，如图7所示，在步骤701中，终端设备当前驻留在某个EHPLMN的公网小区，若获取到的搜网模式为私网优先模式，终端设备的NAS可启动第一定时器。可选的，在步骤702中，终端设备的NAS可向第一定时器发送启动通知，该启动通知中包括用于指示第一定时器启动的指示信息以及该第一定时器的时长。可选的，在步骤703中，在第一定时器超时后，终端设备的NAS可接收来自第一定时器的超时通知。
需要说明的是，第一定时器的时长可根据该第一定时器当前的启动次数确定。例如，在步骤701所示的初始状态下，第一定时器的启动次数为0次，在启动第一定时器之前，终端设备的NAS可根据当前第一定时器的启动次数0次，确定此次第一定时器的时长，该时长可以是一个预设值。在第一定时器启动之后，终端设备的NAS可将第一定时器的启动次数加1，此后，当再次启动该第一定时器时，第一定时器的时长可根据递增后的启动次数确定，例如可以大于或等于第一定时器上次启动时的时长，依此类推。
在一种可能的实施方式中，第一定时器的时长可随着启动次数的增加，按照线性或阶梯性的规律逐渐增加，也即，启动次数越多，第一定时器的时长也越长。例如，可以设置一个相关系数，通过将第一定时器的启动次数乘以相关次数，得到每次启动第一定时器时该第一定时器的时长。再例如，可以设置若干个启动次数的门限值，通过该若干个门限值将启动次数划分为对应的若干个区间，每个区间内第一定时器的时长相同，不同的区间的时长随着启动次数的增大而阶梯性增加，可以根据当前第一定时器的启动次数落在哪个区间内，确定第一定时器的时长是多少。
在第一定时器超时后，在步骤704中，终端设备的NAS可选择第一通信制式且支持CAG的EHPLMN，并在步骤705中将选择的EHPLMN的信息发送给终端设备的AS，该第一通信制式的网络支持CAG功能，例如可以为NR。在步骤706中，终端设备的AS可执行小区搜索，若搜索到支持选择的EHPLMN且满足S准则的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则成功驻留该私网小区。进而，在步骤707中，终端设备的AS可向终端设备的NAS发送小区驻留系统消息，该小区驻留系统消息中可包括驻留的该私网小区的标识信息，以指示驻留该私网小区。在成功驻留私网小区之后，在 步骤708中，终端设备的NAS可重置第一定时器的启动次数，将第一定时器的启动次数清零。
否则，若未搜索到支持选择的EHPLMN的私网小区，或者搜索到的私网小区关联的CAG不是终端设备支持的CAG，终端设备的AS可向终端设备的NAS发送驻留失败系统消息，以指示终端设备驻留失败。此后，终端设备的NAS可重新启动第一定时器。在该第一定时器超时后，终端设备的NAS可重新触发PLMN选择以及小区搜索流程，再次尝试返回到私网小区驻留，直至驻留成功。
需要说明的是，如果终端设备从同一个PLMN下的公网到私网，终端设备在发起业务接入的时候，可通过空口的RRCSetupComplete消息中的IEselectedPLMN-Identity信元指示不同的小区索引，由AMF网元区分是终端设备接入的是私网小区还是公网小区。如果终端设备从不同PLMN或者TA区的公网到私网，终端设备可在发起移动性注册时通过注册请求消息通知AMF。例如，空口的register request消息中携带不同的PLMN，同时也会在RRCSetupComplete消息里通过IEselectedPLMN-Identity指示不同的小区索引，由AMF网元区分终端设备接入的是私网小区还是公网小区。
若获取到的搜网模式为私网优先模式，且终端设备当前驻留在公网小区，在公私网混合部署的网络环境下，终端设备可以通过小区重选的方式返回私网小区驻留。具体的，终端设备当前驻留在第一PLMN的公网小区，若终端设备当前驻留的公网小区的信号测量信息差于设定阈值，终端设备可获取该公网小区的一个或多个邻区的信号测量信息；然后，根据该一个或多个邻区的信号测量信息，从该一个或多个邻区中选择支持第一PLMN或该第一PLMN的等效PLMN的私网小区驻留，若不存在该私网小区，则终端设备可选择支持第一PLMN或该第一PLMN的等效PLMN的公网小区驻留。
示例性地，如图8所示，终端设备当前驻留在第一PLMN的公网小区，该第一PLMN可以为归属PLMN、归属等效PLMN或访问PLMN中的一种。在步骤801中，若终端设备当前驻留的公网小区的信号测量信息差于设定阈值(例如终端设备发生了移动，来到了当前驻留的公网小区的边缘区域，因而信号变差)，终端设备的AS可获取当前驻留的公网小区的一个或多个邻区的信号测量信息。该一个或多个邻区可以是网络预先配置的，该信号测量信息可包括参考信号接收功率(reference signal receiving power，RSRP)、参考信号接收质量(reference signal receiving quality，RSRQ)等用于表征小区信号接收情况的参数。在步骤802中，终端设备的AS可根据测量结果，从上述一个或多个邻区中选择支持第一PLMN或第一PLMN的等效PLMN，且满足R准则的私网小区驻留。其中，R准则是终端设备在进行小区重选时在同频或相同优先级的异频邻区之间适用的准则，表示只有邻区的R值大于服务小区的R值，并且持续一定的时间，才会发生小区重选。具体的，服务小区的R值Rs＝Qmeas,s+QHyst，Qmeas,s是服务小区RSRP，QHyst是小区重选迟滞，用于防止乒乓。邻区的R值Rn＝Qmeas,n–CellQoffset，Qmeas,n是邻区RSRP，CellQoffset是小区重选偏置，用于控制容易或不容易重选。上述各个能量值可以由终端设备读取小区广播得到。在步骤803中，若不存在满足条件的私网小区，则终端设备的AS可选择支持第一PLMN或第一PLMN的等效PLMN且满足R准则的公网小区驻留。进而，在步骤804中，终端设备的AS可向NAS发送驻留小区系统消息，以指示驻留的私网小区或公网小区。在步骤805中，若上述一个或多个邻区中既不存在满足条件的私网小区，也不存在满足条 件的公网小区，则终端设备的AS可确定驻留失败，并向NAS发送丢网指示。此后，在步骤806中，终端设备的NAS可按照丢网搜网流程重新进行PLMN选择。所述丢网搜网流程可参考图6所示实施例的相关描述，不再赘述。
若获取到的搜网模式为私网优先模式，且终端设备当前驻留在访问PLMN的小区(可以是私网小区或公网小区)，在存在公私网混合部署的网络环境下，终端设备可通过小区搜索的方式返回高优先级的PLMN的小区驻留，并优先驻留私网小区。具体的，终端设备可周期性地判断当前是否存在高优先级的PLMN可用，若存在高优先级的PLMN可用，则选择当前可用的优先级最高的PLMN；然后，终端设备可在当前可用的优先级最高的PLMN中执行小区搜索，若搜索到支持该当前可用的优先级最高的PLMN的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则驻留该私网小区。否则，若未搜索到支持该当前可用的优先级最高的PLMN的私网小区，但搜索到支持该当前可用的优先级最高的PLMN的公网小区，则驻留该公网小区。
示例性地，如图9所示，周期性地高优先级搜网流程开始前，终端设备的NAS可按照(等效)归属PLMN->用户控制PLMN->运营商控制PLMN->访问PLMN的顺序，构造候选PLMN列表。在周期性地高优先级搜网流程开始后，在步骤901中，终端设备的NAS可周期性地判断是否存在高优先级的PLMN可用，例如可以按照候选PLMN列表中各个PLMN的优先级顺序进行判断。在步骤902中，若存在高优先级的PLMN可用，终端设备的NAS可选择当前可用的优先级最高的PLMN，并在步骤903中将选择的PLMN的信息发送给终端设备的AS。在步骤904中，终端设备的AS可执行小区搜索，若搜索到支持该选择的当前可用的优先级最高的PLMN且满足S准则的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则驻留该私网小区。否则，在步骤905中，若搜索到支持该选择的当前可用的优先级最高的PLMN且满足S准则的公网小区，则驻留该公网小区。进一步地，在步骤906中，终端设备的AS可向终端设备的NAS发送驻留小区系统消息，以指示驻留的私网小区或公网小区。
所述高优先级的PLMN是指比当前驻留的访问PLMN的优先级高的PLMN，例如可以是(等效)归属PLMN或用户控制PLMN或运营商控制PLMN。如果存在多个高优先级的PLMN可用，终端设备的NAS可按照候选PLMN列表中各个PLMN的优先级顺序，从中选择优先级最高的PLMN。例如，如图10所示，周期性地高优先级搜网流程开始后，终端设备可按照候选PLMN列表中各PLMN的优先级顺序，先判断当前是否存在(等效)归属PLMN可用。若存在(等效)归属PLMN可用，则选择(等效)归属PLMN的小区驻留，优先驻留满足条件的私网小区，如搜索不到满足条件的私网小区，则驻留公网小区。若不存在(等效)归属PLMN可用，则进一步判断当前是否存在用户控制PLMN可用。若存在用户控制PLMN可用，则选择用户控制PLMN的小区驻留，优先驻留满足条件的私网小区，如搜索不到满足条件的私网小区，则驻留公网小区。若不存在用户控制PLMN可用，则再判断当前是否存在运营商控制PLMN可用。若存在运营商控制PLMN可用，则选择运营商控制PLMN的小区驻留，优先驻留满足条件的私网小区，如搜索不到满足条件的私网小区，则驻留公网小区。若不存在运营商控制PLMN可用，则选择继续待在当前的访问PLMN的小区。
上述技术方案中，对于支持用户交互界面的终端设备，可以通过搜网模式选择菜单进 行搜网模式的设置和切换。对于不支持用户交互界面的终端设备，可以在终端设备的SIM卡或NV中预置终端设备支持的搜网模式。如此，可使得终端设备基于搜网模式，快速接入公网或私网提供的服务，或在公网与私网之间进行快速切换，同时降低终端设备的功耗。
图11示例性示出了本申请实施例提供的一种通信装置，该通信装置可用于实现上述方法实施例中终端设备对应的功能，该通信装置支持公网和私网。例如，该通信装置可以是终端设备，还可以是终端设备中包括的芯片或者电路，或者包括终端设备的装置，如各种类型的车辆等。
如图11所示，该通信装置1100包括：收发模块1110和处理模块1120。
示例性的，当该通信装置执行图4中所示的方法实施例中对应终端设备的操作或者步骤时，处理模块1120用于：获取搜网模式，该搜网模式为私网模式、公网模式和私网优先模式中的一种；根据搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换。
在一种可能的设计中，若搜网模式为私网模式，处理模块1120具体用于：根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中支持CAG的PLMN，该第一通信制式的网络支持CAG功能；在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的私网小区，并且该私网小区关联的CAG为通信装置支持的CAG，则驻留该私网小区。
在一种可能的设计中，收发模块1110用于：向接入与移动性管理功能网元发送注册请求消息，该注册请求消息中包括第一指示信息，该第一指示信息用于指示该通信装置支持CAG能力。
在一种可能的设计中，若搜网模式为公网模式，处理模块1120具体用于：根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中非限定仅支持CAG的PLMN，或者选择第二通信制式的PLMN，该第一通信制式的网络支持CAG功能，该第二通信制式的网络不支持CAG功能；在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的公网小区，则驻留该公网小区。
在一种可能的设计中，收发模块1110用于：向接入与移动性管理功能网元发送注册请求消息，该注册请求消息中包括第二指示信息，该第二指示信息用于指示该通信装置不支持CAG能力。
在一种可能的设计中，若搜网模式为私网优先模式，且通信装置当前驻留在公网小区，处理模块1120具体用于：在第一定时器超时的情况下，选择第一通信制式的PLMN中支持CAG的PLMN，该第一通信制式的网络支持CAG功能，该第一定时器被配置为在通信装置当前驻留公网小区且获取到的搜网模式为私网优先模式的情况下开启；在选择的PLMN中执行小区搜索，若搜索到支持该选择的PLMN的私网小区，并且该私网小区关联的CAG为通信装置支持的CAG，则驻留该私网小区。
在一种可能的设计中，该第一定时器的时长根据第一定时器的启动次数确定。
在一种可能的设计中，处理模块1120还用于：在驻留该私网小区后，将第一定时器的启动次数清零。
在一种可能的设计中，处理模块1120还用于：若未搜索到支持该选择的PLMN的私网小区，或者搜索到的私网小区关联的CAG不是通信装置支持的CAG，则重新启动第一 定时器。
在一种可能的设计中，若搜网模式为私网优先模式，且通信装置当前驻留在第一PLMN的公网小区，处理模块1120具体用于：若终端设备当前驻留的公网小区的信号测量信息差于设定阈值，获取该公网小区的一个或多个邻区的信号测量信息；根据该一个或多个邻区的信号测量信息，从该一个或多个邻区中选择支持第一PLMN或第一PLMN的等效PLMN的私网小区驻留，若不存在所述私网小区，选择支持第一PLMN或第一PLMN的等效PLMN的公网小区驻留。
在一种可能的设计中，若搜网模式为私网优先模式且通信装置当前驻留在访问PLMN的小区，处理模块1120具体用于：周期性地判断当前是否存在高优先级的PLMN可用，若存在高优先级的PLMN可用，选择当前可用的优先级最高的PLMN；在该当前可用的优先级最高的PLMN中执行小区搜索，若搜索到支持该当前可用的优先级最高的PLMN的私网小区，并且该私网小区关联的CAG为通信装置支持的CAG，则驻留该私网小区；否则，若搜索到支持该当前可用的优先级最高的PLMN的公网小区，则驻留该公网小区。
在一种可能的设计中，处理模块1120具体用于：通过读取SIM卡或非易失性存储器中预置的搜网模式信息，获取该搜网模式；或者，通过检测用户作用于用户交互界面上的搜网模式选择菜单中该搜网模式对应的选择按钮的触控操作，获取用户选择的该搜网模式，该搜网模式选择菜单中包括私网模式、公网模式和私网优先模式分别对应的选择按钮。
该通信装置中涉及的处理模块1120可以由至少一个处理器或处理器相关电路组件实现，收发模块1110可以由至少一个收发器或收发器相关电路组件或通信接口实现。该通信装置中的各个模块的操作和/或功能分别为了实现图4至图10中所示方法的相应流程，为了简洁，在此不再赘述。可选的，该通信装置中还可以包括存储模块，该存储模块可以用于存储数据和/或指令，收发模块1110和/或处理模块1120可以读取存取模块中的数据和/或程序指令，从而使得通信装置实现相应的方法。该存储模块例如可以通过至少一个存储器实现。
上述存储模块、处理模块和收发模块可以分离存在，也可以全部或者部分模块集成，例如存储模块和处理模块集成，或者处理模块和收发模块集成等。
图12示例性示出了本申请实施例提供的另一种通信装置，该通信装置可用于实现上述方法实施例中终端设备对应的功能，该通信装置支持公网和私网。例如，该通信装置可以是终端设备，还可以是终端设备中包括的芯片或者电路，或者包括终端设备的装置，如各种类型的车辆等。
如图12所述，该通信装置1200可以包括处理器1201和存储器1202。其中，存储器1202用于存储程序指令和/或数据，处理器1201用于执行存储器1202中存储的程序指令，从而实现上述方法实施例中的方法。可选的，存储器1202和处理器1201耦合，所述耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。
可选地，该通信装置1200还可以包括通信接口1203，该通信接口1203用于通过传输介质与其它设备进行通信，例如将接收到的来自其他通信装置的信号传输至处理器1201，或者来自处理器1201的信号传输至其他设备。该通信接口1203可以是收发器，也可以为接口电路，如收发电路、收发芯片等。
在一个示例中，通信接口1203可具体用于执行上述收发模块1110的动作，处理器1201 可具体用于执行上述处理模块1120的动作，本申请在此不再赘述。
本申请实施例中不限定上述处理器1201、存储器1202以及通信接口1203之间的具体连接介质。本申请实施例在图12中以处理器1201、存储器1202以及通信接口1203之间通过总线1204连接，总线在图12中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不限定于此。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图12中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
本申请实施例还提供一种芯片系统，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储程序或指令，当所述程序或指令被所述处理器执行时，使得该芯片系统实现上述任一方法实施例中的对应终端设备的方法。
可选地，该芯片系统中的处理器可以为一个或多个。该处理器可以通过硬件实现也可以通过软件实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等。当通过软件实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现。
可选地，该芯片系统中的存储器也可以为一个或多个。该存储器可以与处理器集成在一起，也可以和处理器分离设置，本申请并不限定。示例性的，存储器可以是非瞬时性处理器，例如只读存储器ROM，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请对存储器的类型，以及存储器与处理器的设置方式不作具体限定。
示例性的，该芯片系统可以是现场可编程门阵列(field programmable gate array，FPGA)，可以是专用集成芯片(application specific integrated circuit，ASIC)，还可以是系统芯片(system on chip，SoC)，还可以是中央处理器(central processor unit，CPU)，还可以是网络处理器(network processor，NP)，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。
应理解，上述方法实施例中的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法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。
本申请实施例还提供一种计算机可读存储介质，该计算机存储介质中存储有程序指令，当该程序指令被通信装置执行时，使得上述方法实施例中的方法被实现。
本申请实施例还提供一种计算机程序产品，当通信装置读取并执行该计算机程序产品时，使得上述方法实施例中的方法被实现。
本申请实施例还提供一种通信系统，该通信系统包括终端设备、接入网设备和核心网设备。
应理解，本申请实施例中提及的处理器可以是CPU，还可以是其他通用处理器、DSP、ASIC、FPGA或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。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。
还应理解，本申请实施例中提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器、可擦除可编程只读存储器、电可擦除可编程只读存储器或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器、动态随机存取存储器、同步动态随机存取存储器、双倍数据速率同步动态随 机存取存储器、增强型同步动态随机存取存储器、同步连接动态随机存取存储器和直接内存总线随机存取存储器。
需要说明的是，当处理器为通用处理器、DSP、ASIC、FPGA或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件时，存储器(存储模块)集成在处理器中。
应注意，本文描述的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解，在本申请的各种实施例中涉及的各种数字编号仅为描述方便进行的区分，上述各过程或步骤的序号的大小并不意味着执行顺序的先后，各过程或步骤的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。

Claims (27)

  1. 一种搜网方法，其特征在于，所述方法应用于终端设备，所述终端设备支持私网和公网；所述方法包括：
    获取搜网模式，所述搜网模式为私网模式、公网模式和私网优先模式中的一种；
    根据所述搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换。
  2. 根据权利要求1所述的方法，其特征在于，若所述搜网模式为私网模式，所述根据所述搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换，包括：
    根据公共陆地移动网络PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中支持封闭访问组CAG的PLMN，所述第一通信制式的网络支持CAG功能；
    在选择的PLMN中执行小区搜索，若搜索到支持所述选择的PLMN的私网小区，并且该私网小区关联的CAG为终端设备支持的CAG，则驻留所述私网小区。
  3. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    向接入与移动性管理功能网元发送注册请求消息，所述注册请求消息中包括第一指示信息，所述第一指示信息用于指示所述终端设备支持CAG能力。
  4. 根据权利要求1所述的方法，其特征在于，若所述搜网模式为公网模式，所述根据所述搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：
    根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中非限定仅支持CAG的PLMN，或者选择第二通信制式的PLMN，所述第一通信制式的网络支持CAG功能，所述第二通信制式的网络不支持CAG功能；
    在选择的PLMN中执行小区搜索，若搜索到支持所述选择的PLMN的公网小区，则驻留所述公网小区。
  5. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    向接入与移动性管理功能网元发送注册请求消息，所述注册请求消息中包括第二指示信息，所述第二指示信息用于指示所述终端设备不支持CAG能力。
  6. 根据权利要求1所述的方法，其特征在于，若所述搜网模式为私网优先模式，且所述终端设备当前驻留在公网小区，所述根据所述搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：
    在第一定时器超时的情况下，选择第一通信制式的PLMN中支持CAG的PLMN，所述第一通信制式的网络支持CAG功能；
    在选择的PLMN中执行小区搜索，若搜索到支持所述选择的PLMN的私网小区，并且该私网小区关联的CAG为所述终端设备支持的CAG，则驻留所述私网小区；
    其中，所述第一定时器被配置为在所述终端设备当前驻留公网小区且获取到的所述搜网模式为私网优先模式的情况下开启。
  7. 根据权利要求6所述的方法，其特征在于，所述第一定时器的时长根据所述第一定时器的启动次数确定。
  8. 根据权利要求6或7所述的方法，其特征在于，驻留所述私网小区后，所述方法还包括：
    将所述第一定时器的启动次数清零。
  9. 根据权利要求6至8中任一项所述的方法，其特征在于，所述方法还包括：
    若未搜索到支持所述选择的PLMN的私网小区，或者搜索到的私网小区关联的CAG不是所述终端设备支持的CAG，重新启动所述第一定时器。
  10. 根据权利要求1所述的方法，其特征在于，若所述搜网模式为私网优先模式，且所述终端设备当前驻留在第一PLMN的公网小区，所述根据所述搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：
    若所述终端设备当前驻留的公网小区的信号测量信息差于设定阈值，获取所述公网小区的一个或多个邻区的信号测量信息；
    根据所述一个或多个邻区的信号测量信息，从所述一个或多个邻区中选择支持第一PLMN或所述第一PLMN的等效PLMN的私网小区驻留，若不存在所述私网小区，则选择支持所述第一PLMN或所述第一PLMN的等效PLMN的公网小区驻留。
  11. 根据权利要求1所述的方法，其特征在于，若所述搜网模式为私网优先模式且所述终端设备当前驻留在访问PLMN的小区，所述根据所述搜网模式，驻留公网小区或私网小区或在公网小区与私网小区之间进行切换，包括：
    周期性地判断当前是否存在高优先级的PLMN可用，若存在高优先级的PLMN可用，则选择当前可用的优先级最高的PLMN；
    在所述当前可用的优先级最高的PLMN中执行小区搜索，若搜索到支持所述当前可用的优先级最高的PLMN的私网小区，并且该私网小区关联的CAG为所述终端设备支持的CAG，则驻留所述私网小区；
    否则，若搜索到支持所述当前可用的优先级最高的PLMN的公网小区，则驻留所述公网小区。
  12. 根据权利要求1至11中任一项所述的方法，其特征在于，所述获取搜网模式，包括：
    通过读取SIM卡或非易失性存储器中预置的搜网模式信息，获取所述搜网模式；或者，
    通过检测用户作用于用户交互界面上的搜网模式选择菜单中所述搜网模式对应的选择按钮的触控操作，获取用户选择的所述搜网模式，所述搜网模式选择菜单中包括所述私网模式、所述公网模式和所述私网优先模式分别对应的选择按钮。
  13. 一种通信装置，其特征在于，所述通信装置支持私网和公网；所述通信装置包括处理模块，所述处理模块用于：
    获取搜网模式，所述搜网模式为私网模式、公网模式和私网优先模式中的一种；
    根据所述搜网模式，驻留私网小区或公网小区或在公网小区与私网小区之间进行切换。
  14. 根据权利要求13所述的装置，其特征在于，若所述搜网模式为私网模式，所述处理模块具体用于：
    根据公共陆地移动网络PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中支持封闭访问组CAG的PLMN，所述第一通信制式的网络支持CAG功能；
    在选择的PLMN中执行小区搜索，若搜索到支持所述选择的PLMN的私网小区，并且该私网小区关联的CAG为所述通信装置支持的CAG，则驻留所述私网小区。
  15. 根据权利要求14所述的装置，其特征在于，所述通信装置还包括收发模块，所述收发模块用于：
    向接入与移动性管理功能网元发送注册请求消息，所述注册请求消息中包括第一指示信息，所述第一指示信息用于指示所述通信装置支持CAG能力。
  16. 根据权利要求13所述的装置，其特征在于，若所述搜网模式为公网模式，所述处理模块具体用于：
    根据PLMN列表中各个PLMN的优先级顺序，选择第一通信制式的PLMN中非限定仅支持CAG的PLMN，或者选择第二通信制式的PLMN，所述第一通信制式的网络支持CAG功能，所述第二通信制式的网络不支持CAG功能；
    在选择的PLMN中执行小区搜索，若搜索到支持所述选择的PLMN的公网小区，则驻留所述公网小区。
  17. 根据权利要求16所述的装置，其特征在于，所述通信装置还包括收发模块，所述收发模块用于：
    向接入与移动性管理功能网元发送注册请求消息，所述注册请求消息中包括第二指示信息，所述第二指示信息用于指示所述通信装置不支持CAG能力。
  18. 根据权利要求13所述的装置，其特征在于，若所述搜网模式为私网优先模式，且所述通信装置当前驻留在公网小区，所述处理模块具体用于：
    在第一定时器超时的情况下，选择第一通信制式的PLMN中支持CAG的PLMN，所述第一通信制式的网络支持CAG功能；
    在选择的PLMN中执行小区搜索，若搜索到支持所述选择的PLMN的私网小区，并且该私网小区关联的CAG为所述通信装置支持的CAG，则驻留所述私网小区；
    其中，所述第一定时器被配置为在所述通信装置当前驻留公网小区且获取到的所述搜网模式为私网优先模式的情况下开启。
  19. 根据权利要求18所述的装置，其特征在于，所述第一定时器的时长根据所述第一定时器的启动次数确定。
  20. 根据权利要求18或19所述的装置，其特征在于，驻留所述私网小区后，所述处理模块还用于：
    将所述第一定时器的启动次数清零。
  21. 根据权利要求18至20中任一项所述的装置，其特征在于，所述处理模块还用于：
    若未搜索到支持所述选择的PLMN的私网小区，或者搜索到的私网小区关联的CAG不是所述通信装置支持的CAG，则重新启动所述第一定时器。
  22. 根据权利要求13所述的装置，其特征在于，若所述搜网模式为私网优先模式，且所述通信装置当前驻留在第一PLMN的公网小区，所述处理模块具体用于：
    若所述通信装置当前驻留的公网小区的信号测量信息差于设定阈值，获取所述公网小区的一个或多个邻区的信号测量信息；
    根据所述一个或多个邻区的信号测量信息，从所述一个或多个邻区中选择支持第一PLMN或所述第一PLMN的等效PLMN的私网小区驻留，若不存在所述私网小区，则选择支持所述第一PLMN或所述第一PLMN的等效PLMN的公网小区驻留。
  23. 根据权利要求13所述的装置，其特征在于，若所述搜网模式为私网优先模式且所述通信装置当前驻留在访问PLMN的小区，所述处理模块具体用于：
    周期性地判断当前是否存在高优先级的PLMN可用，若存在高优先级的PLMN可用，则选择当前可用的优先级最高的PLMN；
    在所述当前可用的优先级最高的PLMN中执行小区搜索，若搜索到支持所述当前可用的优先级最高的PLMN的私网小区，并且该私网小区关联的CAG为所述通信装置支持的 CAG，则驻留所述私网小区；
    否则，若搜索到支持所述当前可用的优先级最高的PLMN的公网小区，则驻留所述公网小区。
  24. 根据权利要求13至23中任一项所述的装置，其特征在于，所述处理模块具体用于：
    通过读取SIM卡或非易失性存储器中预置的搜网模式信息，获取所述搜网模式；或者，
    通过检测用户作用于用户交互界面上的搜网模式选择菜单中所述搜网模式对应的选择按钮的触控操作，获取用户选择的所述搜网模式，所述搜网模式选择菜单中包括所述私网模式、所述公网模式和所述私网优先模式分别对应的选择按钮。
  25. 一种通信装置，其特征在于，所述通信装置包括处理器和存储器，所述处理器和所述存储器耦合，所述处理器用于控制所述通信装置实现如权利要求1至12中任一项所述的方法。
  26. 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程序指令，当所述程序指令被通信装置执行时，使得如权利要求1至12中任一项所述的方法被实现。
  27. 一种计算机程序产品，其特征在于，当通信装置读取并执行所述计算机程序产品时，使得如权利要求1至12中任一项所述的方法被实现。
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