WO2025112571A1 - 一种漫游场景下的网络注册方法和终端设备 - Google Patents

一种漫游场景下的网络注册方法和终端设备 Download PDF

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Publication number
WO2025112571A1
WO2025112571A1 PCT/CN2024/106911 CN2024106911W WO2025112571A1 WO 2025112571 A1 WO2025112571 A1 WO 2025112571A1 CN 2024106911 W CN2024106911 W CN 2024106911W WO 2025112571 A1 WO2025112571 A1 WO 2025112571A1
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WIPO (PCT)
Prior art keywords
network
roaming
terminal device
plmn
operator
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PCT/CN2024/106911
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English (en)
French (fr)
Inventor
魏珍荣
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Honor Device Co Ltd
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Honor Device Co Ltd
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Filing date
Publication date
Application filed by Honor Device Co Ltd filed Critical Honor Device Co Ltd
Priority to CN202480051565.4A priority Critical patent/CN121713594A/zh
Publication of WO2025112571A1 publication Critical patent/WO2025112571A1/zh
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks

Definitions

  • the present application relates to the field of communications, and more specifically, to a network registration method and terminal device in a roaming scenario in the field of communications.
  • Mobile communication is a widely used communication method in the world.
  • Terminal devices e.g., mobile phones
  • PLMN public land mobile network
  • inter-operator roaming is allowed between operators, and different operators have different PLMNs.
  • the home operator of the terminal device is operator A, and the terminal device can register to the network of other operators that have signed a roaming agreement with operator A through roaming.
  • a terminal device preferentially searches for a high-standard network (e.g., a 4G network) on the PLMN of an operator (e.g., operator B) in the roaming area but fails to register for the high-standard network on the PLMN of the operator, the terminal device receives a registration rejection message including, for example, a reason value #111.
  • the terminal device will suspend disabling the high-standard network on the PLMN of the operator and suspend network searches on the PLMNs of other operators in the roaming area.
  • the terminal device will preferentially search for a low-standard network (e.g., a 2G network or a 3G network) on the PLMN of the operator where the network has been searched before. If the operator supports roaming registration of terminal devices to low-standard networks, then when the terminal device searches for the low-standard network of the operator and registers successfully, the terminal device will communicate on the low-standard network, resulting in a poor user experience.
  • a low-standard network e.g., a 2G network or a 3G network
  • An embodiment of the present application provides a network registration method and a terminal device in a roaming scenario.
  • the terminal device fails to register a high-standard network of a PLMN of a roaming operator in a roaming area
  • the terminal device searches for a high-standard network on the PLMN of other roaming operators in the roaming area to try to register to the high-standard network.
  • the terminal device has more opportunities to preferentially register to the high-standard network, thereby improving the user experience of using the network in the roaming scenario.
  • a network registration method in a roaming scenario comprising: in a case where a first network is searched for on a PLMN of a first roaming operator in a roaming area, sending a first registration request, the first registration request being used to request that a terminal device be registered to the first network of the PLMN of the first roaming operator; receiving a registration rejection message in response to the first registration request, the registration rejection message being used to indicate that the terminal device has not been successfully registered to the first network of the PLMN of the first roaming operator.
  • a network is provided, and is used to instruct a terminal device to search for a second network whose network standard is lower than the first network on the PLMN of a first roaming operator; in response to a registration rejection message, search for the first network on the PLMNs of other roaming operators in the roaming area except the first roaming operator; and when the first network is found on the PLMN of a second roaming operator among other roaming operators, send a second registration request to register the terminal device to the first network of the PLMN of the second roaming operator.
  • a terminal device when a terminal device fails to register with a high-standard first network (e.g., a 4G network) of a PLMN of a first roaming operator (e.g., China Mobile) and receives a registration rejection message indicating to search for a second network (e.g., a 3G network or a 2G network) with a network standard lower than the first network on the PLMN of the first roaming operator, in response to the registration rejection message, the terminal device searches for the high-standard first network on the PLMNs of other roaming operators other than the roaming operator in the roaming area.
  • a high-standard first network e.g., a 4G network
  • a PLMN of a first roaming operator e.g., China Mobile
  • the terminal device when a high-standard first network is searched for on the PLMN of a second new roaming operator (e.g., China Telecom), the terminal device sends a registration request to request registration with the high-standard first network of the second roaming operator, so that the terminal device has more opportunities to preferentially register with the high-standard first network, avoiding the problem of poor user experience caused by the terminal device searching for a low-standard second network on the PLMN of the first roaming operator and finally registering with the low-standard second network in the prior art, and effectively improving the user experience of using the network in the roaming scenario.
  • a second new roaming operator e.g., China Telecom
  • the network registration method in a roaming scenario provided in an embodiment of the present application, by setting a first preset time duration, limits the search for the first network on the PLMN of other roaming operators within the first preset time duration, thereby avoiding the problem that the terminal device is unable to access the network due to long-term continuous searching for the first network, and further improves the user experience of using the network in the roaming scenario.
  • the method further includes: if the terminal device fails to successfully register to the first network of the PLMN of the second roaming operator and the first preset time has not timed out, continuing to search for the first network on the PLMNs of roaming operators other than the second roaming operator among other roaming operators within the first preset time.
  • the chance of the terminal device searching for the first network can be increased, so as to increase the chance of registering with the first network and improve the user experience of using the network in a roaming scenario.
  • the method further includes: when the terminal device fails to successfully register to the first network of the PLMN of the second roaming operator and the first preset time has expired, searching for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area.
  • the terminal device when the first preset time period expires and the terminal device has not successfully registered with the first network, such as the PLMN of the second roaming operator, in order to enable the terminal device to access the network as soon as possible, the terminal device no longer searches for the first network, but searches for a second network of a lower standard on the PLMN of at least one roaming operator in the roaming area to register with the second network, thereby reducing the risk of the terminal device being unable to access the network for a long time and increasing the probability of the terminal device accessing the network as soon as possible.
  • the first network such as the PLMN of the second roaming operator
  • the method further includes: before the first preset time period expires, searching for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area before the first preset time period expires, when the first network is not found on the PLMN of any other roaming operator.
  • the terminal device has traversed all roaming operators among other roaming operators before the first preset time has expired, and the traversal result is that the first network has not been searched for on the PLMN of any roaming operator.
  • the search time (i.e., the first preset time) is ended in advance so that the low-standard second network can be searched for on the PLMN of at least one roaming operator in the roaming area in advance (i.e., before the first preset time expires), thereby reducing unnecessary search time, so that the terminal device can search for other networks earlier to access the network as early as possible, thereby improving the user experience of using the network in the roaming scenario.
  • the method further includes: searching for a second network with a lower network standard than the first network on the PLMN of at least one roaming operator in the roaming area when the first preset time has expired and the first network has not been searched on the PLMN of other roaming operators.
  • the network registration method in a roaming scenario no longer searches for the first network after the first preset time has expired, but searches for a second network of a lower standard on the PLMN of at least one roaming operator in the roaming area. This allows the terminal device to access the network as much as possible by searching for other networks, thereby reducing the risk of the terminal device being unable to access the network for a long time and increasing the probability of the terminal device accessing the network as soon as possible.
  • the method further includes: searching for a second network with a lower network standard than the first network on the PLMN of at least one roaming operator in the roaming area when the first network is not found on the PLMNs of at least some roaming operators of other roaming operators.
  • the terminal device can try to access the network by searching other networks, reducing the risk of the terminal device being unable to access the network for a long time, so as to increase the probability of the terminal device accessing the network as soon as possible.
  • the method further includes: when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator, searching for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area.
  • the terminal device can try to access the network by searching other networks, reducing the risk of the terminal device being unable to access the network for a long time, so as to increase the probability of the terminal device accessing the network as soon as possible.
  • a second network with a lower network standard than the first network is preferentially searched on the PLMN of the first roaming operator.
  • the terminal device in the process of searching for a second network of a lower standard, preferentially searches for the second network on the PLMN of the first roaming operator that has previously searched for the first network.
  • the process of searching for the second network of the lower standard can comply with the existing protocol as much as possible, reduce changes to the protocol, and achieve the purpose of simplifying the design.
  • searching for the first network on the PLMN of other roaming operators within a first preset time duration includes: in response to the registration rejection message, prohibiting the use of the first network of the PLMN of the first roaming operator within a second preset time duration, and searching for the first network on the PLMN of other roaming operators within the first preset time duration, the first preset time duration being less than the second preset time duration.
  • the network registration method in a roaming scenario provided in an embodiment of the present application due to the failure of the first network registration of the PLMN of the first roaming operator, by limiting a second preset time period, prohibiting the terminal device from using the first network of the PLMN of the first roaming operator within the second preset time period, can avoid the problem that the terminal device may attempt to register the first network of the PLMN of the first roaming operator multiple times in a short period of time and all fail, resulting in the terminal device being unable to access the network for a long time.
  • a timer is started in response to the registration rejection message, and the duration of the timer is the first preset duration; and the first network is searched on the PLMN of other roaming operators within the duration of the timer.
  • the registration reject message includes any one of the following cause values: cause value #111, cause value #16, cause value #17.
  • the first network is a 5G network or a 4G network.
  • the first network is a 6G network or a higher standard network.
  • a terminal device is provided, and the terminal device is used to execute the method provided in the first aspect.
  • the terminal device may include a module for executing any possible implementation manner of the first aspect.
  • a terminal device comprising a processor.
  • the processor is coupled to a memory and can be used to execute instructions in the memory to implement the method in any possible implementation of the first aspect.
  • the terminal device also includes a memory.
  • the device also includes a communication interface, and the processor is coupled to the communication interface.
  • a computer-readable storage medium on which a computer program is stored.
  • the apparatus implements the method in any possible implementation manner of the first aspect described above.
  • a computer program product comprising instructions
  • a device implements the method in any possible implementation manner of the above-mentioned first aspect.
  • a chip comprising: an input interface, an output interface, a processor and a memory, wherein the input interface, the output interface, the processor and the memory are connected via an internal connection path, and the processor is used to execute the code in the memory.
  • the processor is used to execute the method in any possible implementation of the first aspect above.
  • FIG1 is a schematic scenario diagram of a mobile communication system provided in an embodiment of the present application.
  • FIG. 2 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application.
  • FIG. 3 is a network registration method in a roaming scenario according to the prior art provided by an embodiment of the present application.
  • FIG. 4 is an exemplary flowchart of a network registration method in a roaming scenario provided in an embodiment of the present application.
  • FIG5 is a schematic flowchart of the interaction between devices of the network registration method in the roaming scenario provided by an embodiment of the present application.
  • FIG. 6 is another schematic flowchart of a network registration method in a roaming scenario provided in an embodiment of the present application.
  • FIG. 7 is another schematic flow chart of a network registration method in a roaming scenario provided by an embodiment of the present application
  • FIG. 8 is an exemplary block diagram of a terminal device provided in an embodiment of the present application.
  • FIG9 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.
  • PLMN Public land mobile network
  • PLMN is a network established and operated by the government or its approved operators to provide land mobile communication services to the public.
  • PLMN is interconnected with the public switched telephone network to form a communication network of the entire region or country.
  • PLMN is synonymous with mobile communication network. Specifically in our country, the network of each mobile communication operator can be regarded as a PLMN as a whole.
  • the networks of China Mobile, China Unicom and China Telecom are different PLMNs.
  • MCC mobile country code
  • MNC mobile net code
  • MCC uniquely indicates the country to which the mobile user belongs. For example, China's MCC is 460.
  • MNC can uniquely indicate a network in that country.
  • the MNC of China Mobile (referred to as China Mobile) can include 00
  • the MNC of China Unicom (referred to as Unicom) can include 01
  • the MNC of China Telecom (referred to as Telecom) can include 11
  • the MNC of China Broadcasting and Television referred to as Broadcasting and Television) can include 15.
  • Each operator can include at least one PLMN.
  • Table 1 shows different PLMNs corresponding to different operators.
  • China Mobile's PLMN may include 46000, 46002, 46004, 46007, and 46008; China Unicom's PLMN may include 46001, 46006, 46009, and 46010. China Telecom's PLMN may include 46003, 46011, and 46012; and China Broadcasting and Television's PLMN may include 46015. In the future, each operator's PLMN may also include other PLMNs, which are not limited in this application.
  • HPLMN Home PLMN
  • HPLMN is the PLMN to which the terminal device belongs, called the home PLMN.
  • the MCC and MNC contained in the international mobile subscriber identification number (IMSI) on the terminal user's universal subscriber identity module (USIM) card (also called the global subscriber identity card) are consistent with the MCC and MNC on the HPLMN.
  • IMSI international mobile subscriber identification number
  • USIM universal subscriber identity module
  • the mobile PLMN includes 4 PLMNs, and the home PLMN of a certain terminal device is one of the 4 PLMNs.
  • the home operator is the operator of the terminal device's card, or in other words, the home operator is the operator to which the terminal device's HPLMN belongs. For example, if the terminal device's card is a China Mobile card, then China Mobile is the home operator of the terminal device.
  • the roaming operator is the operator in the roaming area, which is an operator other than the home operator.
  • Xiao Wang is a mobile user
  • China Mobile is the home operator of Xiao Wang's mobile phone. If he is on a business trip in Germany, then the operator located in Germany, such as TMO, is the roaming operator.
  • the terminal device can access the PLMN of the roaming operator. For example, if the home operator of the terminal device is China Mobile, and China Mobile has signed a roaming agreement with DeutscheInstitut's TMO, then when the terminal device roams to Germany, the terminal device can roam and access the PLMN of TMO.
  • the embodiments of the present application can be applied not only to international roaming scenarios, but also to domestic roaming scenarios.
  • allowing domestic roaming between operators is an important means to reduce the cost of network construction.
  • the home operator of the terminal device is China Unicom, and China Unicom has signed a roaming agreement with China Mobile.
  • China Mobile is the roaming operator, and China Unicom's terminal devices can access China Mobile's network through roaming.
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • WCDMA wideband code division multiple access
  • TD-SCDMA time-division code division multiple access
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD fifth generation new radio
  • 6G sixth generation
  • FIG1 is a schematic scenario diagram of a mobile communication system provided by an embodiment of the present application.
  • the mobile communication system includes a terminal device, at least one access network device and at least one core network device.
  • the embodiment of the present application does not limit the number of core network devices, access network devices and terminal devices in the mobile communication system.
  • the terminal device is connected to the access network device wirelessly, and the access network device is connected to the core network device wirelessly or wired.
  • the core network device and the access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the access network device can be integrated on the same physical device, or the functions of some core network devices and some access network devices can be integrated on one physical device.
  • the terminal device can be fixed or movable.
  • the access network device is a device that the terminal device accesses to the mobile communication system by wireless means, which can be a base station NodeB, an evolved base station (evolved NodeB, eNodeB), a transmission reception point (transmission reception point, TRP), a next generation base station (next generation NodeB, gNB) in a 5G mobile communication system, a base station in a future mobile communication system or an access node in a WiFi system, or a wireless controller in a Cloud Radio Access Network (Cloud Radio Access Network, CRAN) scenario, or a relay station, a vehicle-mounted device, a wearable device, and a network device in a future evolved PLMN network, etc.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the access network device.
  • a terminal device is any device that can use a SIM card for communication.
  • a terminal device can also be called a terminal, user equipment (UE), mobile station (MS), or mobile terminal.
  • the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a smart watch, etc.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.
  • core network devices 131, 132, 133, and 134 support their respective corresponding operators, i.e., core network device 131 supports operator B, core network device 132 supports operator C, core network device 133 supports operator D, and core network device 134 supports operator A.
  • the core network equipment of the operator is connected to the terminal equipment through the access network equipment of the operator.
  • An access network device can support one or more operators.
  • the multiple operators jointly build and share the network of the access network device to reduce the cost of network construction.
  • the number of 5G network access network devices required is 3-4 times that of 4G network access network devices.
  • access network device 121 , access network device 122 , access network device 124 , and access network device 125 each support one operator, and each operator establishes its own access network device.
  • the access network device 123 supports two operators: operator B and operator C, that is, operator B and operator C jointly build the access network device 123, so that operator B and operator C can share the network of the access network device 123 to reduce the cost of network construction.
  • operator B and operator C can jointly build a 5G standalone (SA) base station, so that China Telecom and China Unicom can share the 5G network of the same base station.
  • SA 5G standalone
  • radio and television and mobile can jointly build a 5G SA base station, so that radio and television and mobile can also share the 5G network of the same base station.
  • the access network equipment supports multiple networks, multiple operators can only share the network jointly built by both parties. For example, if an access network equipment supports 4G network and 5G network, the 4G network is independently built by operator B, and operator B and operator C only jointly build the 5G network, then operator B and operator C can only share the 5G network, and operator C cannot use the 4G network of the access network equipment.
  • the terminal device can access the network of the access network device of the home operator, and in a roaming scenario, the terminal device can access the network of the access network device of the roaming operator that has signed a roaming agreement with the home operator.
  • the home operator of the terminal device 110 is operator A
  • the access network device 121 is the access network device of operator B
  • the access network device 122 is the access network device of operator C
  • the access network device 123 is the access network device of the 5G network jointly built by operators B and C
  • the access network device 124 is the access network device of operator D
  • the access network device 125 is the access network device of operator A.
  • terminal device 110 can access the 5G networks of access network devices 121, 122 and 123 of each operator through roaming, and can directly access the network of access network device 125 of the home operator (operator A), but cannot access the network of access network device 124.
  • access network device 123 is an access network device of the 5G network jointly built and shared by operator B and operator C, and operator A has signed roaming agreements for 5G networks with operator B and operator C, in a roaming scenario, when terminal device 110 roams between operator B and operator C, it can access access network device 123 through roaming, that is, terminal device 110 accesses the same access network device through roaming. 5G network.
  • terminal device 110 can access the 4G network of access network device 121, the 5G network of access network device 122, and the 5G network of operator C of access network device 123 through roaming, but cannot access the 5G network of operator B of access network device 123 and the network of access network device 124, and can directly access the network of access network device 125 of the home operator (operator A).
  • the access network device 123 is an access network device of the 5G network jointly built and shared by operators B and C, operator A has only signed a roaming agreement for the 5G network with operator C. Therefore, in a roaming scenario, the terminal device 110 can only access the 5G network of operator C of the access network device 123 through roaming, but cannot access the 5G network of operator B of the access network device 123.
  • the mobile communication system shown in Figure 1 is only for illustrative purposes and should not be construed as limiting the embodiments of the present application.
  • the mobile communication system may also include more or fewer core network devices, access network devices, and terminal devices.
  • FIG2 shows a schematic diagram of the structure of the terminal device 110.
  • the terminal device 110 may include, but is not limited to, a processor 111, an antenna 1, an antenna 2, a mobile communication module 112, a wireless communication module 113, a subscriber identification module (SIM) card interface 114 and other components.
  • the terminal device 110 may also include an audio module 115, a display screen 116, a camera 117, a sensor module 118, an external memory interface, an internal memory, a universal serial bus (USB) interface, a charging management module, a power management module, a battery, a button, a motor, an indicator and other components.
  • a processor 111 may include, but is not limited to, a processor 111, an antenna 1, an antenna 2, a mobile communication module 112, a wireless communication module 113, a subscriber identification module (SIM) card interface 114 and other components.
  • the terminal device 110 may also include an audio module 115, a display screen 116, a camera 117, a sensor module
  • the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the terminal device 110.
  • the terminal device 100 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently.
  • the components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.
  • the processor 111 may include one or more processing units, for example: the processor 111 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a memory, a video codec, a digital signal processor (digital signal processor, DSP), a baseband processor, and/or a neural network processor (neural-network processing unit, NPU), etc.
  • different processing units can be independent devices or integrated in one or more processors.
  • the controller can be the nerve center and command center of the terminal device 110. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of fetching and executing instructions.
  • the processor 110 may also be provided with a memory for storing instructions and data.
  • the memory in the processor 110 is a cache memory.
  • the memory may store instructions or data that the processor 110 has just used or cyclically used. If the processor 110 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.
  • the processor 110 searches for a network in a roaming scenario, searches for a high-standard network (for example, a 4G network or a 5G network) of a PLMN of a roaming operator in the roaming area, and then sends a registration request to request registration of the network. If the registration is successful, the processor 110 resides in the network for communication. If the registration fails, the processor 110 may Search for networks with the same network standard on the PLMNs of other roaming operators in the roaming area to try to register to a high-standard network.
  • a high-standard network for example, a 4G network or a 5G network
  • a high-standard network is not found on the PLMNs of other roaming operators, search for a low-standard network (for example, a 3G network or a 2G network) with a lower network standard on the PLMNs of at least one roaming operator in the roaming area to allow the terminal device to access the network as much as possible.
  • a low-standard network for example, a 3G network or a 2G network
  • the wireless communication function of the terminal device 110 can be implemented through the antenna 1, the antenna 2, the mobile communication module 112, the wireless communication module 113, the modem processor and the baseband processor.
  • Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals.
  • Each antenna in terminal device 110 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of antennas.
  • antenna 1 can be reused as a diversity antenna for a wireless local area network.
  • the antenna can be used in combination with a tuning switch.
  • the mobile communication module 112 can provide solutions for wireless communications including 2G/3G/4G/5G applied to the terminal device 110.
  • the mobile communication module 112 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc.
  • the mobile communication module 112 can receive electromagnetic waves from the antenna 1, and filter, amplify, and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation.
  • the mobile communication module 112 can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1.
  • at least some of the functional modules of the mobile communication module 112 can be set in the processor 111.
  • at least some of the functional modules of the mobile communication module 112 can be set in the same device as at least some of the modules of the processor 111.
  • the wireless communication module 113 can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) network), bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR) and the like applied to the terminal device 110.
  • WLAN wireless local area networks
  • BT wireless fidelity
  • GNSS global navigation satellite system
  • FM frequency modulation
  • NFC near field communication
  • IR infrared
  • the wireless communication module 113 can be one or more devices integrating at least one communication processing module.
  • the wireless communication module 113 receives electromagnetic waves via the antenna 2, modulates the frequency of the electromagnetic wave signal and performs filtering processing, and sends the processed signal to the processor 111.
  • the wireless communication module 113 can also receive the signal to be sent from the processor 111, modulate the frequency of the signal, amplify the signal, and convert it into electromagnetic waves for radiation through the antenna 2.
  • the antenna 1 of the terminal device 110 is coupled to the mobile communication module 112, and the antenna 2 is coupled to the wireless communication module 113, so that the terminal device 110 can communicate with the network and other devices through wireless communication technology.
  • the wireless communication technology may include GSM, GPRS, WCDMA, TD-SCDMA, LTE, FDD, TDD, 5G NR or 6G system, BT, GNSS, WLAN, NFC, FM, and/or IR technology.
  • the GNSS may include a global positioning system (GPS), a global navigation satellite system (GLONASS), a Beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS) and/or a satellite-based augmentation system (SBAS).
  • GPS global positioning system
  • GLONASS global navigation satellite system
  • BDS Beidou navigation satellite system
  • QZSS quasi-zenith satellite system
  • SBAS satellite-based augmentation system
  • the SIM card of the terminal device supports different mobile networks of various operators, and the terminal device can interact with various mobile networks through the SIM card and the mobile communication module 112 to achieve mobile calls and data communications.
  • the SIM card of the terminal device is a telecom card, and the terminal device can interact with the telecom network through the SIM card and the mobile communication module 112 to achieve mobile calls and data communications on the telecom network.
  • the SIM card interface 114 is used to connect a SIM card.
  • the SIM card can be inserted into the SIM card interface 114 or removed from the SIM card.
  • the card interface 114 is pulled out to achieve contact and separation with the terminal device 110.
  • the terminal device 110 can support 1 or N SIM card interfaces, where N is a positive integer greater than 1.
  • the SIM card interface 114 can support Nano SIM card, Micro SIM card, SIM card, etc. Multiple cards can be inserted into the same SIM card interface 114 at the same time. The types of the multiple cards can be the same or different.
  • the SIM card interface 114 can also be compatible with different types of SIM cards.
  • the SIM card interface 114 can also be compatible with external memory cards.
  • the terminal device 110 interacts with the networks of various operators through the SIM card to achieve functions such as calls and data communications.
  • Figure 3 is a network registration method in a roaming scenario of the prior art provided by an embodiment of the present application.
  • the terminal device roams to the roaming area and needs to access the network of the roaming area through roaming.
  • Operator B is the operator of the roaming area.
  • Access network device A supports the 4G network of operator B, and access network device B supports the 3G network and 2G network of operator B.
  • step S310 the terminal device roams to a roaming location and searches for a 4G network of the PLMN of operator B in the roaming location.
  • the terminal device searches for networks in descending order of network standards, and preferentially searches for the 4G network of the PLMN of operator B. It should be understood that compared with 3G and 2G networks, the 4G network is a high-standard network.
  • step S320 the terminal device sends a registration request for the 4G network to the access network device A to request registration to the 4G network of the PLMN of the operator B.
  • step S330 in response to the registration request, the access network device A sends a registration rejection message to the terminal device, indicating that the terminal device has not successfully registered with the 4G network of the PLMN of the operator B.
  • the registration rejection message includes a reason value for network registration failure.
  • the terminal device fails to register with the network, there are generally two reasons: one is the network reason, such as network interruption, system failure, etc.; the other is the user reason, such as the user not signing a GPRS function contract leading to network rejection, the user not signing a roaming agreement leading to network rejection, etc.
  • the terminal device will determine the reason for the registration failure based on the cause value in the registration rejection message fed back by the access network device.
  • the common cause values of user reasons are: Cause#7, indicating that GPRS service is not allowed; Cause#11, indicating that PLMN is not allowed;.
  • the common cause values of network reasons are: Cause#16, indicating that the mobile switching center (MSC) is temporarily inaccessible; Cause#17, indicating network failure; Cause#111, indicating protocol error.
  • the reason value included in the registration rejection message may be a network registration failure caused by a network reason such as Cause#16, Cause#17, and Cause#111.
  • the terminal device executes step S340 based on the reason value.
  • step S340 the terminal device disables the 4G network of the PLMN of operator B within a preset time (for example, 12 minutes), and preferentially searches for a low-standard 3G network or 2G network on the PLMN of operator B.
  • a preset time for example, 12 minutes
  • the terminal device receives the registration rejection message sent by access network device A.
  • the reason for the network registration failure can be determined based on the reason value in the registration rejection message.
  • the terminal device disables the 4G network of operator B within a preset time (for example, 12 minutes) and prioritizes searching for 3G or 2G networks with network standards lower than 4G on operator B's PLMN.
  • the search for low-standard 3G networks or 2G networks on the PLMN of operator B is prioritized here, which means that after failing to successfully register with the 4G network of the PLMN of operator B, the terminal device will first search for low-standard 3G networks or 2G networks on the PLMN of operator B.
  • the terminal device searches for the 3G network or 2G network on the PLMN of operator B to try to register the 3G network or 2G network on the PLMN of operator B. During this period, the terminal device will not search for any network on the PLMN of other operators. Only when the registration on the 3G network or 2G network of the PLMN of operator B fails or the 3G network or 2G network is not searched, the terminal device will try to search for the network on the PLMN of other operators.
  • step S350 the terminal device searches for the 3G network of the PLMN of operator B.
  • step S360 the terminal device sends a registration request for the 3G network to the access network device B to request to register with the 3G network of the PLMN of the operator B.
  • step S370 access network device B sends a registration success message to the terminal device.
  • step S380 after the preset time expires, the terminal device releases the disabled state of the 4G network of the operator B's PLMN, performs reselection or redirection processes to return to the 4G network and retry to register with the 4G network. If the registration fails, step S340 and subsequent steps are continued to finally register to the 3G network. If the registration is successful, it stays in the 4G network.
  • the terminal device if the terminal device preferentially searches for a high-standard network (for example, a 4G network) on the PLMN of a roaming operator (for example, operator B) but fails to register with the high-standard network of the PLMN of the roaming operator, the terminal device will respond to the received registration rejection message including, for example, a reason value #111, and will suspend the use of the high-standard network of the roaming operator and suspend the search for networks on the PLMNs of other roaming operators. Instead, the terminal device will preferentially search for low-standard networks (for example, 2G networks or 3G networks) on the PLMN of the roaming operator. If a low-standard network is searched on the PLMN of the roaming operator, the terminal device will register to the low-standard network of the roaming operator through roaming.
  • a high-standard network for example, a 4G network
  • a roaming operator for example, operator B
  • the terminal device will respond to the received registration rejection message including, for example, a reason value #1
  • the terminal device itself supports roaming registration to the high-standard network of the PLMN of other roaming operators (for example, operator C), but because the terminal device fails to register with the high-standard network of the PLMN of a certain roaming operator (for example, operator B) and receives a registration rejection message including, for example, reason value #111, the search for the PLMN of other roaming operators will be suspended, resulting in the terminal device being able to register only to the low-standard network and unable to register to the high-standard network of other roaming operators, resulting in a poor user experience.
  • the terminal device itself supports roaming registration to the high-standard network of the PLMN of other roaming operators (for example, operator C)
  • the terminal device fails to register with the high-standard network of the PLMN of a certain roaming operator (for example, operator B) and receives a registration rejection message including, for example, reason value #111
  • an embodiment of the present application provides a network registration method in a roaming scenario.
  • a terminal device fails to register with a high-standard network of a PLMN of a roaming operator in the roaming area
  • the terminal device searches for a high-standard network on the PLMNs of other roaming operators in the roaming area to attempt to register with the high-standard network.
  • the terminal device has more opportunities to register with the high-standard network first, thereby improving the user experience.
  • the network registration method in the roaming scenario of the embodiment of the present application can be applied to any roaming scenario.
  • the method can be applied to scenarios such as the first network access of a terminal device in a roaming location, network reselection in a roaming location, and network access after a terminal device is restarted in a roaming location.
  • the method 400 is described in detail by taking the terminal device as the execution subject of the method 400.
  • the execution subject of the method 400 may also be a chip or processor of the corresponding terminal device.
  • Fig. 4 is an exemplary flow chart of a network registration method 400 in a roaming scenario provided by an embodiment of the present application.
  • Fig. 5 is a schematic flow chart of device-to-device interaction of a network registration method 400 in a roaming scenario provided by an embodiment of the present application.
  • step S410 when a first network is searched on a PLMN of a first roaming operator in a roaming location, a first registration request is sent, where the first registration request is used to request registration with the first network of the PLMN of the first roaming operator.
  • the terminal device can automatically search for a network or perform a network search according to a network search instruction input by the user. If the user is currently in a roaming location, the user's terminal device searches for a first network of a PLMN of a first roaming operator in the roaming location, and the terminal device sends a first registration request to the access network device to request registration to the first network of the PLMN of the first roaming operator currently searched. It should be understood that the first roaming operator is any operator in the roaming location.
  • the terminal device can search for networks in order of network standards from high to low. Therefore, the first network searched by the terminal device can be considered to be the network with the highest network standard that the terminal device can (or is allowed to) search.
  • the first network is a 4G network, and it can be considered that the 4G network is the network with the highest network standard that the terminal device can currently search.
  • the terminal device may not have successfully searched for the 5G network due to reasons such as previous registration failure or failure to search for a signal.
  • the first network is a 5G network, and it can be considered that the 5G network is the network with the highest network standard that the terminal device can search.
  • the first network is a 3G network
  • the 3G network is the network with the highest network standard that the terminal device can search.
  • the terminal device may not have successfully searched for the relevant network due to reasons such as previous registration failure or failure to search for a signal.
  • the first network of the PLMN of the first roaming operator searched by the terminal device is the first network of any PLMN of the first roaming operator. No limitation is made here, and the specific PLMN searched by the terminal device in the actual scenario shall prevail.
  • step S411 when the first network is searched on the PLMN of the first roaming operator in the roaming area, the terminal device sends a first registration request to the access network device #1.
  • step S420 the terminal device receives a registration rejection message in response to the first registration request, wherein the registration rejection message is used to indicate that the terminal device has not successfully registered with the first network of the PLMN of the first roaming operator, and is used to instruct the terminal device to search for a second network with a network standard lower than the first network on the PLMN of the first roaming operator.
  • the second network is a low-standard network and the first network is a high-standard network.
  • the access network device receives the first registration request, and in response to the first registration request, sends a registration rejection message to the terminal device, and the terminal device receives the registration rejection message.
  • the terminal device knows the following two things: first, the terminal device has not successfully registered with the first network (e.g., 4G network) of the PLMN of the first roaming operator (e.g., mobile) for which registration is requested; second, the terminal device needs to search for a second network (e.g., 3G network or 2G network) with a network standard lower than the first network (e.g., 4G network) on the PLMN of the first roaming operator (e.g., mobile).
  • a second network e.g., 3G network or 2G network
  • the registration rejection message indicates that while the terminal device searches for a second network with a network standard lower than the first network on the PLMN of the first roaming operator, the terminal device will not search for a network with any network standard on the PLMN of other roaming operators.
  • the registration rejection message includes a reason value indicating a registration failure.
  • the present application does not impose any restrictions on the specific content of the reason value, as long as the reason value can express the meaning of "the terminal device failed to successfully register with the first network of the PLMN of the first roaming operator" and can express the meaning of "the terminal device searches for a second network with a network standard lower than the first network on the PLMN of the first roaming operator".
  • the reason value in the registration rejection message of the present application indicates the reason value for the registration failure due to network reasons.
  • the reason value may be any of the following: reason value #111, reason value #16, reason value #17.
  • Reason value #111 indicates protocol error
  • reason value #16 indicates that the MSC is temporarily unreachable
  • reason value #17 indicates network failure.
  • the terminal device can execute step S430 after a registration failure, that is, the terminal device can execute step S430 after receiving the first registration rejection message including the reason value #111.
  • the protocol stipulates that the terminal device can have 5 consecutive opportunities to register with the network, that is, as long as the network registration is not successful, the terminal device can initiate 5 registration requests to request to register with the network. Therefore, in order to comply with the protocol to the greatest extent, in the embodiment of the present application, the terminal device can execute step S430 after sending the registration request for the fifth time and failing to successfully register with the network, that is, the terminal device can execute step S430 after receiving the fifth registration rejection message including reason value #16 or reason value #17.
  • step S421 after the access network device #1 receives the first registration request sent by the terminal device, it responds to the first registration request and sends a registration rejection message to the terminal device.
  • step S430 in response to the registration rejection message, the terminal device searches for the first network on the PLMNs of other roaming operators except the first roaming operator in the roaming area.
  • the terminal device when it receives the registration rejection message sent by the access network device, it will not search for a second network (e.g., 3G network or 2G network) with a network standard lower than the first network (e.g., 4G network) on the PLMN of the first roaming operator (e.g., China Mobile) as in the prior art, but will search for the first network (e.g., 4G network) on the PLMN of other roaming operators (e.g., China Unicom, China Telecom, or China Broadcasting, etc.) in the roaming area except the first roaming operator (e.g., China Mobile).
  • the terminal device searches for a high-standard first network on other roaming operators, which can give the terminal device more opportunities to access the high-standard first network as soon as possible to improve user experience.
  • the other roaming operators here can be at least one roaming operator in the roaming area except the first roaming operator, and not necessarily all operators in the roaming area except the first roaming operator.
  • the other roaming operators can be at least one of China Unicom, China Telecom and Radio and Television.
  • the terminal device searches for the first network on the PLMN of other roaming operators, which means that the terminal device can search for the first network on the PLMN of other roaming operators, and the terminal device does not necessarily search through each of the other roaming operators.
  • the other roaming operators include three roaming operators.
  • the terminal device first searches for and successfully registers to the first network on one of the roaming operators. Then, the terminal device does not need to continue searching for the first network on the remaining two roaming operators.
  • the terminal device While the terminal device is searching for the first network on the PLMNs of other roaming operators, the terminal device will not search for any network of any standard on the PLMN of the first roaming operator. Only when the first network is not found on the PLMNs of other roaming operators or the registration for the first network fails, is it possible to search for a lower-standard network on the PLMN of the first roaming operator.
  • step S440 when the terminal device searches for the first network on the PLMN of the second roaming operator among other roaming operators, the terminal device sends a second registration request to register the terminal device with the first network of the PLMN of the second roaming operator.
  • the terminal device searches for the first network of the higher standard on the PLMN of the operator of the second roaming location, then the terminal device sends a second registration request to the access network device to register the terminal device with the operator of the second roaming location.
  • the access network device sends a registration success message to the terminal device to indicate that the terminal device is successfully registered to the first network of the PLMN of the second roaming operator.
  • the terminal device can communicate on the first network of the PLMN of the second roaming operator.
  • the second roaming operator is any operator in the roaming area except the first roaming operator.
  • the second roaming operator and the first roaming operator can jointly build and share the same access network device, such as the access network device 123 shown in Figure 1, and the second roaming operator and the first roaming operator can share the first network of the same access network device.
  • the terminal device sends the first registration request and the second registration request to the same access network device.
  • the second roaming operator and the first roaming operator each use different access network devices.
  • the terminal device sends a second registration request to access network device #2 to request registration to the first network of the PLMN of the second roaming operator. If the terminal device is successfully registered, in step S450, access network device #2 sends a registration success message to the terminal device to indicate that the terminal device is successfully registered to the first network of the PLMN of the second roaming operator. Thereafter, the terminal device can communicate on the first network of the PLMN of the second roaming operator.
  • the first network of the PLMN of the second roaming operator searched by the terminal device is the first network of any PLMN of the second roaming operator. No limitation is made here, and the specific PLMN searched by the terminal device in the actual scenario shall prevail.
  • the home operator of the terminal device is the TMO of Irish Bengal, and the user of the terminal device moves from Germany to China.
  • the four operators in China (China Mobile, China Unicom, China Telecom and China Broadcasting) are the roaming operators of the terminal device.
  • the terminal device After the terminal device is turned on, it searches for a 4G network (an example of the first network) of a PLMN of China Mobile (an example of the first roaming operator) and sends a registration request to request registration to the 4G network of China Mobile's PLMN.
  • the terminal device After the terminal device receives a registration rejection message including, for example, a reason value #111 for the failure to register with China Mobile's 4G network, the terminal device stops searching for the 4G network on China Mobile's PLMN, and does not search for a 3G network or a 2G network on China Mobile's PLMN like the prior art, but searches for the 4G network on the PLMN of at least one operator among China Unicom, China Telecom and China Broadcasting. After searching for the 4G network on China Telecom's PLMN, it sends a registration request to register the terminal device to China Telecom's 4G network.
  • a registration rejection message including, for example, a reason value #111 for the failure to register with China Mobile's 4G network
  • the terminal device when the terminal device fails to register with a high-standard first network (e.g., 4G network) of the PLMN of the first roaming operator (e.g., China Mobile) and receives a registration rejection message for instructing to search for a second network (e.g., 3G network or 2G network) with a network standard lower than the first network on the PLMN of the first roaming operator, in response to the registration rejection message, the terminal device searches for the first network on the PLMNs of other roaming operators other than the first roaming operator in the roaming area.
  • a high-standard first network e.g., 4G network
  • a second network e.g., 3G network or 2G network
  • the terminal device when a high-standard first network is searched on the PLMN of the second roaming operator (e.g., China Telecom) of other roaming operators, the terminal device sends a registration request to request registration to the high-standard first network, so that the terminal device has more opportunities to preferentially register with the high-standard first network, avoiding the problem in the prior art that the terminal device searches for a low-standard second network on the PLMN of the first roaming operator and finally registers with the low-standard second network, resulting in poor user experience, and effectively improving user experience.
  • the second roaming operator e.g., China Telecom
  • the terminal device when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator, the terminal device searches for a network with a lower network standard than the first network on the PLMN of at least one roaming operator in the roaming area. That is to say, if the terminal device fails to register, the terminal device will search for a second network of a low standard on the PLMN of at least one roaming operator in the roaming area.
  • the at least one roaming operator of the roaming area here may be part or all of the operators of the roaming area, without any limitation.
  • the at least one roaming operator of the roaming area may include the first roaming operator, or may not include the first roaming operator, without any limitation.
  • the explanation of "at least one roaming operator of the roaming area” in the similar description "searching for a second network with a network standard lower than the first network (or searching for a second network with a lower standard) on the PLMN of at least one roaming operator of the roaming area" is the same as here, and will not be repeated later.
  • the terminal device searches for the second network on the PLMN of at least one roaming operator in the roaming area, which means that the terminal device can search for the second network on the PLMN of the at least one roaming operator, and the terminal device does not necessarily have to traverse and search each of the at least one roaming operator.
  • the at least one roaming operator includes three roaming operators.
  • the terminal device first searches for and successfully registers to the second network on one of the roaming operators. Then, the terminal device does not need to continue searching for the second network on the remaining two roaming operators.
  • operator priority is given, and for a roaming operator, in order from high to low network standards, the terminal device attempts to search for second networks of all network standards on the PLMN of a roaming operator, and initiates a registration request to request network registration when a second network of any network standard is found. If the registration is successful, networks of other network standards are no longer searched, and if the registration is not successful, networks of other network standards are continued to be searched; if second networks of all network standards are not found on the PLMN of the roaming operator, an attempt is made to search for second networks of all network standards on the PLMN of another roaming operator, until a second network of any network standard is found on the PLMN of any roaming operator.
  • the terminal device can search for a 3G network or 2G network with a network standard lower than the 4G network on the PLMNs of China Mobile, China Unicom, China Telecom and China Radio and Television.
  • 3G and 2G can be regarded as two network standards of the second network.
  • the terminal device first searches for 3G network on the mobile PLMN. If a 3G network is found, a registration request for the 3G network is initiated to request registration to the 3G network. If the registration is successful, the mobile 2G network is no longer searched.
  • the terminal device continues to search for 2G network on the mobile PLMN. Similarly, if a 2G network is found, a registration request for the 2G network is initiated to request registration to the 2G network. If the registration is successful, the network of other roaming operators is no longer searched. If the registration is not successful or the mobile 2G network is not found, the 3G network or 2G network is searched on the PLMN of another roaming operator (for example, China Unicom) in the order of network standards from high to low, until a 3G network or 2G network is found on the PLMN of any roaming operator.
  • another roaming operator for example, China Unicom
  • the network standard is prioritized.
  • the terminal device attempts to search for a second network under the network standard on the PLMN of each roaming operator, and initiates a registration request to request network registration when the second network of the network standard is searched on the PLMN of any roaming operator. If the registration is successful, the terminal device no longer searches for the second network under the network standard of other roaming operators, and continues to search if the registration is unsuccessful.
  • the terminal device can search for a 3G network or a 2G network with a network standard lower than the 4G network on the PLMN of China Mobile, China Unicom, China Telecom and China Broadcasting Corporation.
  • 3G and 2G can be regarded as two network standards of the second network.
  • the 3G network is searched first.
  • the terminal device searches for the 3G network on the PLMN of China Mobile. If a 3G network is found, a registration request for the 3G network is initiated to request registration to the 3G network.
  • the terminal device searches for the 3G network on the PLMNs of China Unicom, China Telecom and China Broadcasting Corporation until a 3G network is found and registration is successful on the PLMN of any roaming operator. If a 3G network is not found on the PLMN of any roaming operator, the terminal device starts searching for the 2G network on the PLMNs of China Mobile, China Unicom, China Telecom and China Broadcasting Corporation until a 2G network is found on the PLMN of any roaming operator.
  • the terminal device in the step of the terminal device searching for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area, the terminal device preferentially searches for the second network with a network standard lower than the first network on the PLMN of the first roaming operator.
  • the at least one roaming operator includes the first roaming operator.
  • the terminal device when searching for a second network of a low standard, preferentially searches for the second network on the PLMN of the first roaming operator that has previously searched for the first network.
  • the terminal device initiates a registration request to attempt to register with the second network.
  • the terminal device can continue to search for the second network on the PLMN of other roaming operators. In this way, the process of searching for a second network of a low standard can comply with the existing protocol as much as possible, reduce changes to the protocol, and achieve the purpose of simplifying the design.
  • the terminal device preferentially searches for the second network on the PLMN of the first roaming operator.
  • the terminal device preferentially attempts to search for the second network of all network standards on the PLMN of the first roaming operator; in another example, for the above-mentioned method 2, it can be understood that when searching for the second network of the same network standard on the PLMN of at least one roaming operator, the terminal device preferentially attempts to search for the second network of the network standard on the PLMN of the first roaming operator.
  • a second network with a lower network standard than the first network is searched on the PLMNs of at least one roaming operator in the roaming area.
  • the terminal device when the terminal device fails to search for the first network, the terminal device will search for a second network of a lower standard on the PLMN of at least one roaming operator in the roaming area.
  • the at least some of the roaming operators here refer to some or all of the other roaming operators. Due to some conditional restrictions (such as the time limit of the method 600 below) or network problems, the terminal device may not be able to search for all other roaming operators. Therefore, the terminal device may search for a second network with a lower standard after searching for some of the roaming operators.
  • the registration rejection message is also used to instruct the terminal device to prohibit the use of the first network of the PLMN of the first roaming operator within a second preset time period, and, in the above-mentioned step S430, that is, the step of searching for the first network on the PLMNs of other roaming operators in response to the registration rejection message, the terminal device prohibits the use of the first network of the PLMN of the first roaming operator within the second preset time period in response to the registration rejection message, and searches for the first network on the PLMNs of other roaming operators.
  • the second preset duration can be any duration, and is not limited here. Exemplarily, the second preset duration is less than or equal to 15 minutes. For example, the second preset duration can be 14 minutes, 13 minutes, 12 minutes, 10 minutes, 9 minutes, 8 minutes, 7 minutes, etc.
  • a second preset time period is limited. During the second preset time period, the terminal device is prohibited from using the first network of the PLMN of the first roaming operator, and during the period of disabling the first network of the PLMN of the first roaming operator, the first network is preferentially searched on the PLMNs of other roaming operators.
  • the terminal device releases the disabled state of the first network of the PLMN of the first roaming operator, so that the terminal device can return to the first network by performing a reselection or redirection process to retry to register with the first network. If the registration fails, step S430 and subsequent steps are continued to be performed, and if the registration is successful, the terminal device resides in the first network. In this way, if the terminal device ultimately fails to successfully register with the first network, after the disabled state of the first network of the PLMN of the first roaming operator is released, the terminal device has a chance to return to the first network of the high standard again to try to register with the first network, so as to improve the user experience as much as possible.
  • a timer (defined as a second timer) may be set, and the second preset duration may be controlled by the timer.
  • the terminal device in response to the registration rejection message, starts a second timer, prohibits the use of the first network of the PLMN of the first roaming location within the duration of the second timer, and the duration of the second timer is a second preset duration; the terminal device searches for the first network on the PLMN of other roaming operators. And after the second timer times out, the terminal device releases the disabled state of the first network of the PLMN of the first roaming operator.
  • step S410 no matter which PLMN of the first roaming operator the terminal device searches for the first network, after receiving the registration rejection message, the terminal device will prohibit the use of the first network on all PLMNs of the first roaming operator.
  • the terminal device searches for the first network on the PLMN of other roaming operators within a first preset time period in response to the registration rejection message.
  • the first preset time length is less than or equal to 2 minutes.
  • the first preset time length may be 2 minutes, 1.5 minutes, 1 minute, 0.5 minutes, etc.
  • the first preset duration of different durations can be set, and the first preset duration of the first network of different network standards is not specifically limited and can be flexibly set based on actual conditions.
  • the first preset duration is duration 1
  • the first preset duration is duration 2
  • the first preset duration is duration 3
  • duration 1, duration 2, and duration 3 are all different.
  • networks with higher network standards have more frequency points, and it takes longer to search for these networks. Therefore, in order to enable the terminal device to search for higher-standard networks as much as possible, the higher the network standard of the first network, the longer the first preset duration is set. For example, the first preset duration for a 5G network is longer than the first preset duration for a 4G network.
  • the problem of the terminal device being unable to access the network due to long-term continuous search for the first network can be avoided, thereby further improving the user experience.
  • a timer (defined as a first timer) may be set, and the first preset duration may be controlled by the timer.
  • the terminal device in response to a registration rejection message, starts a first timer, where the duration of the first timer is a first preset duration; the terminal device searches for the first network on the PLMN of other roaming operators within the duration of the first timer.
  • the terminal device prohibits the use of the first network of the PLMN of the first roaming operator within the second preset duration in response to the registration rejection message, and searches for the first network on the PLMNs of the other roaming operators within the first preset duration, wherein the first preset duration is less than the second preset duration.
  • the terminal device searches for the first network on the PLMNs of other roaming operators within the first preset time period. After the first preset time period expires, regardless of the terminal device being in various states (successfully registering the first network, or unsuccessfully registering the first network, or not searching for the first network, etc.), the terminal device stops searching for the first network on the PLMNs of any roaming operator of other roaming operators, and since the second preset time period has not expired, the terminal device is still prohibited from using the first network of the PLMN of the first roaming operator.
  • the second preset time length is 12 minutes, and the first preset time length is less than or equal to 2 minutes.
  • the first preset time length may be 2 minutes, 1.5 minutes, 1 minute, 0.5 minutes, etc.
  • the terminal device in response to the registration rejection message, starts the second timer, prohibits the use of the first network of the PLMN of the first roaming location within the duration of the second timer, and starts the first timer, searches for the first network on the PLMN of other roaming operators within the duration of the first timer.
  • the duration of the first timer is the first preset duration
  • the duration of the second timer is the second preset duration
  • the first preset duration is less than the second preset duration.
  • steps of starting the second timer and the first timer of the terminal device can be performed simultaneously, or the second timer can be started first and then the first timer. No limitation is made here.
  • Fig. 6 is a schematic flow chart of a network registration method 600 in a roaming scenario provided by an embodiment of the present application.
  • various situations in which the terminal device searches for a network are described in detail in combination with the first preset duration and the second preset duration.
  • step S611 the terminal device searches for the first network on the PLMN of the first roaming location.
  • step S612 when the first network is searched on the PLMN of the first roaming operator, a registration request #1 is sent to the access network device 1, where the registration request #1 is used to request registration to the first network of the PLMN of the first roaming operator.
  • the registration request #1 here may correspond to the first registration request mentioned above.
  • step S613 in response to registration request #1, access network device 1 sends registration rejection message #1, and the terminal device receives registration rejection message #1.
  • the registration rejection message #1 is used to indicate that the terminal device has not successfully registered with the first network of the PLMN of the first roaming operator, and is used to instruct the terminal device to search for a second network whose network standard is lower than the first network on the PLMN of the first roaming operator.
  • the registration rejection message #1 includes a reason value #111, a reason value #16, or a reason value #17.
  • step S614 in response to the registration rejection message #1, the terminal device prohibits the use of the first network of the PLMN of the first roaming operator within the second preset duration, and searches for the first network on the PLMNs of other roaming operators within the first preset duration.
  • step S615 the terminal device determines whether the first network is searched within the first preset time period.
  • the terminal device determines whether it has searched for a 4G network before the first preset time expires.
  • the terminal device executes step S620.
  • the terminal device can choose one of the two situations to execute. In the first situation, the terminal device executes step S641, or in the second situation, the terminal device executes step S642.
  • the purpose is to search for a second network with a network standard lower than the first network when the first network is not found.
  • step S620 when the terminal device searches for the first network on the PLMN operated by the second roaming operator of other roaming operators, it sends a registration request #2 to the access network device 2, where the registration request #2 is used to request registration to the first network of the PLMN of the second roaming operator.
  • the registration request #2 here may correspond to the second registration request above.
  • the access network device 1 and the access network device 2 can be the same device or different devices, which mainly depends on whether the first roaming operator and the second roaming operator share the same access network device.
  • the access network device 1 and the access network device 2 can be the same device, and the terminal device will send the registration request #1 and the registration request #2 to the same access network device; in the case where the first roaming operator and the second roaming operator do not share the same access network device, different access network devices support their respective roaming operators, the access network device 1 and the access network device 2 are different devices, and the terminal device will send the registration request #1 and the registration request #2 to the access network device 1 and the access network device 2 supported by the first roaming operator and the second roaming operator, respectively.
  • step S621 the terminal device determines whether the registration is successful.
  • the terminal device determines whether the terminal device is successfully registered with the first network of the PLMN of the second roaming operator.
  • the terminal device When the terminal device is successfully registered, the terminal device communicates through the first network of the second roaming operator until the second preset time period times out, and step S660 is executed.
  • step S623 and step S631 or step S632 are executed to determine whether the first preset time has timed out, and to execute different steps if it has timed out or not.
  • the terminal device determines whether the terminal device is successfully registered based on the message fed back by the access network device. If the terminal device receives a registration rejection message #2 for registration request #2, it means that the registration is unsuccessful; if the terminal device receives a registration success message for registration request #2d, it means that the registration is successful.
  • step S623 when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator, the terminal device determines whether the first preset duration has timed out.
  • step S632 When the first preset time duration times out, the terminal device executes step S632; when the first preset time duration does not time out, the terminal device executes step S631.
  • step S631 when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator and the first preset time has not timed out, the terminal device continues to search for the first network on the PLMNs of other roaming operators except the second roaming operator among other roaming operators within the first preset time.
  • step S615 and subsequent related steps are repeatedly executed to try to register with the first network of a higher standard or the second network of a lower standard.
  • the terminal device searches for the first network on the PLMN of a roaming operator other than the second roaming operator among other roaming operators, for example, a third roaming operator, a new registration request is initiated, and if the registration is successful, the first network of the PLMN of the third roaming operator is used for communication; if the first network of the PLMN of the third roaming operator is not successfully registered and the first preset time period has not expired, the terminal device continues to search for the first network on the PLMN of roaming operators other than the second roaming operator and the third roaming operator among other roaming operators until the first network is found within the first preset time period or a second network of a lower standard is searched after the first preset time period expires.
  • the terminal device when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator and the first preset time period has not timed out, the terminal device continues to search for the first network on the PLMNs of other roaming operators except the second roaming operator among other roaming operators within the first preset time period, which can increase the chance of the terminal device searching for the first network, thereby increasing the chance of registering with the first network and improving the user experience.
  • step S632 when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator and the first preset time has expired, the terminal device searches for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area.
  • step S650 is executed to register with the second network of a low standard.
  • the terminal device in the step where the terminal device searches for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area, the terminal device preferentially searches for a second network with a network standard lower than the first network on the PLMN of the first roaming operator.
  • step S641 when the first preset time has not timed out and the first network has not been searched on the PLMN of any roaming operator in other roaming operators, before the first preset time has timed out, the terminal device searches for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area.
  • the terminal device has traversed all roaming operators in other roaming operators before the first preset duration expires, and the traversal result is that the first network has not been searched on the PLMN of any roaming operator.
  • the terminal device does not need to wait for the first preset duration to end before searching for the second network of a lower standard, but ends the search duration (i.e., the first preset duration) in advance.
  • the terminal device searches for the second network of a lower standard on the PLMN of at least one roaming operator in the roaming area in advance.
  • the search duration is ended in advance so that the second network of a lower standard can be searched on the PLMN of at least one roaming operator in the roaming area in advance, thereby reducing unnecessary search duration, so that the terminal device can search for other networks as soon as possible to access the network as soon as possible, thereby improving user experience.
  • the first preset duration has not timed out means a time that does not exceed the end time of the first preset duration
  • before the first preset duration times out means a time before the end time of the first preset duration exceeds the end time of the first preset duration
  • the terminal device in the step where the terminal device searches for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area, the terminal device preferentially searches for a second network with a network standard lower than the first network on the PLMN of the first roaming operator.
  • the terminal device starts the first timer and searches for the first network on the PLMNs of other roaming operators within the duration of the first timer; if the first timer has not timed out and the first network has not been searched on the PLMNs of any other roaming operators, the terminal device turns off the first timer in advance; after turning off the first timer, the terminal device searches for a second network with a network standard lower than the first network on the PLMNs of at least one roaming operator in the roaming area.
  • the early closing of the first timer described here means closing the timer before the first timer expires.
  • the terminal device can search for the second network with a low standard in advance before the first preset time expires.
  • step S642 when the first preset time expires and the first network has not been found on the PLMNs of other roaming operators, the terminal device searches for a second network with a lower network standard than the first network on the PLMNs of at least one roaming operator in the roaming area.
  • the terminal device when the first preset time has expired, the terminal device has not searched for the first network on the PLMN of other roaming operators, but the first preset time has expired. In this case, the terminal device no longer searches for the first network, but searches for a low-standard second network on the PLMN of at least one roaming operator in the roaming area.
  • the terminal device in the step where the terminal device searches for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area, the terminal device preferentially searches for a second network with a network standard lower than the first network on the PLMN of the first roaming operator.
  • step S650 when the terminal device searches for a second network with a lower network standard than the first network on any PLMN of the roaming operator, the terminal device sends a registration request #3 to request that the terminal device be registered to the second network of the PLMN of the roaming operator.
  • any roaming operator here is any roaming operator among the at least one roaming operator mentioned above.
  • the terminal device preferentially searches for the second network on the PLMN of the first roaming operator, if If the terminal device searches for the second network on the PLMN of the first roaming operator, then any one of the roaming operators is the first roaming operator.
  • step S660 when the second preset time period expires, the terminal device releases the disabled state of the first network of the PLMN of the first roaming operator.
  • the terminal device can return to the first network by performing a reselection or redirection process to search and try to register the first network again. If the registration fails, the terminal device continues to search the first network or the second network to try to connect the terminal device to the network. If the registration is successful, the terminal device stays in the first network. In this way, if the terminal device ultimately fails to successfully register with the first network, after the disabled state of the first network of the PLMN of the first roaming operator is released, the terminal device has a chance to return to the first network of the high standard again to try to register with the first network, so as to improve the user experience as much as possible.
  • FIG. 7 is a schematic flowchart of a network registration method 700 in a roaming scenario provided by an embodiment of the present application.
  • method 700 an example is taken in which the first network is a 4G network and the second network is a 3G network or a 2G network, and an example in which roaming operator #1 is a first roaming operator, roaming operator #2 is a second roaming operator, timer #1 is a first timer, and timer #2 is a second timer, to illustrate a specific embodiment.
  • roaming operator #1 is a first roaming operator
  • roaming operator #2 is a second roaming operator
  • timer #1 is a first timer
  • timer #2 is a second timer
  • the terminal device in a roaming scenario, is located in the roaming area, is turned on to search for a network, and searches for a network on the PLMN of the roaming area operator in the roaming area.
  • step S711 the terminal device searches for a 4G network on the PLMN of the roaming operator #1.
  • step S712 when a 4G network is searched on the PLMN of the roaming operator #1, a registration request #1 is sent to the access network device 1, where the registration request #1 is used to request registration to the 4G network of the PLMN of the roaming operator #1.
  • step S713 in response to registration request #1, access network device 1 sends registration rejection message #1, and the terminal device receives registration rejection message #1.
  • step S714 the terminal device starts timer #2, and prohibits using the 4G network of the PLMN of the roaming operator #2 during the duration of timer #2.
  • the duration of timer #2 is the second preset duration.
  • step S715 the terminal device starts timer #1.
  • the duration of timer #1 is a first preset duration, which is shorter than a second preset duration.
  • step S714 and step S715 there is no limitation on the order of step S714 and step S715, and step S714 and step S715 can be executed simultaneously, that is, the terminal device can start timer #2 and timer #1 at the same time; or, step S714 can be executed before step S715, that is, the terminal device starts timer #2 first, and then starts timer #1.
  • step S716 the terminal device searches for a 4G network on the PLMN of other roaming operators within the duration of timer #1.
  • step S717 the terminal device determines whether a 4G network is searched within the duration of timer #1.
  • the terminal device determines whether a 4G network is searched before timer #1 times out.
  • step S720 If a 4G network is found within the duration of timer #1, the terminal device executes step S720; if a 4G network is not found within the duration of timer #1, the terminal device executes step S741 or step S742, with the purpose of searching for a 3G network or a 2G network with a lower network standard than the 4G network if a 4G network is not found.
  • step S720 when the terminal device searches for a 4G network on the PLMN of roaming operator #2 of other roaming operators, it sends a registration request #2 to access network device 2, where registration request #2 is used to request registration to the 4G network of the PLMN of roaming operator #2.
  • step S721 the terminal device determines whether the registration is successful.
  • the terminal device determines whether the registration is successful, what is determined is whether the terminal device is successfully registered to the 4G network of the PLMN of the roaming operator #2.
  • the terminal device When the terminal device is successfully registered, the terminal device communicates through the 4G network of the roaming operator #2 until timer #2 times out, and then executes step S760.
  • step S723 and step S731 or step S732 are executed to determine whether timer #1 has timed out, and to execute different steps if it has timed out or not.
  • the terminal device determines whether the terminal device is successfully registered based on the message fed back by the access network device. If the terminal device receives the registration rejection message #2, it means that the registration is not successful; if the terminal device receives the registration success message, it means that the registration is successful.
  • step S723 the terminal device determines whether timer #1 has timed out.
  • step S732 When timer #1 times out, the terminal device executes step S732; when timer #1 has not timed out, the terminal device executes step S731.
  • step S731 if the terminal device fails to successfully register to the 4G network of the PLMN of roaming operator #2 and timer #1 has not expired, the terminal device continues to search for the 4G network on the PLMNs of other roaming operators except roaming operator #2 within the duration of timer #1.
  • step S717 and subsequent related steps are repeatedly executed, and finally an attempt is made to register to a high-standard 4G network, or an attempt is made to register to a low-standard 3G network or 2G network.
  • step S631 in method 600 For a specific description of this step, reference can be made to the description of step S631 in method 600, which will not be repeated here.
  • step S732 when the terminal device fails to successfully register with the 4G network of the PLMN of the roaming operator #2 and timer #1 times out, the terminal device searches for a 3G network or a 2G network on the PLMN of at least one roaming operator in the roaming area.
  • step S632 in method 600 please refer to the relevant description of step S632 in method 600, which will not be repeated here.
  • step S741 when timer #1 has not timed out and no 4G network is searched on the PLMN of any other roaming operator, timer #1 is closed in advance; after timer #1 is closed, the terminal device searches for a 3G network or a 2G network on the PLMN of at least one roaming operator in the roaming area.
  • timer #1 means closing the timer before timer #1 expires.
  • the terminal device can search for the 3G network or 2G network in advance before the first preset time period expires.
  • step S641 in method 600 please refer to the relevant description of step S641 in method 600, which will not be repeated here.
  • step S742 when timer #1 times out and no 4G network has been found on the PLMN of other roaming operators, the terminal device searches for a 3G network or a 2G network on the PLMN of at least one roaming operator in the roaming area.
  • step S642 in method 600 please refer to the relevant description of step S642 in method 600, which will not be repeated here.
  • step S750 when the terminal device searches for a 3G network or a 2G network on any PLMN of the roaming operator, it sends a registration request #3 to request that the terminal device be registered to the 3G network or the 2G network of the PLMN of the roaming operator.
  • any roaming operator here is any roaming operator among the at least one roaming operator mentioned above.
  • the terminal device preferentially searches for a low-standard network on the PLMN of roaming operator #1, if the terminal device searches for a 3G network or a 2G network on the PLMN of roaming operator #1, then the any roaming operator is roaming operator #1.
  • step S760 when timer #2 times out, the terminal device releases the disabled state of the 4G network of the PLMN of the roaming operator #1.
  • FIG8 is an exemplary block diagram of a terminal device 800 provided in an embodiment of the present application.
  • the terminal device 800 includes a processing unit 810 and a transceiver unit 820 .
  • the transceiver unit 820 is used to: when searching for a first network on a public land mobile network PLMN of a first roaming operator in a roaming area, send a first registration request, wherein the first registration request is used to request to register the terminal device to the first network of the PLMN of the first roaming operator;
  • the transceiver unit 820 is further configured to: receive a registration rejection message in response to the first registration request, wherein the registration rejection message is used to indicate that the terminal device has not successfully registered with the first network of the PLMN of the first roaming operator, and is used to instruct the terminal device to search for a second network with a network standard lower than that of the first network on the PLMN of the first roaming operator;
  • the processing unit 810 is configured to: in response to the registration rejection message, search for the first network on the PLMNs of other roaming operators in the roaming area except the first roaming operator;
  • the transceiver unit 820 is further configured to, when the first network is searched for on the PLMN of a second roaming operator among the other roaming operators, send a second registration request to register the terminal device with the first network of the PLMN of the second roaming operator.
  • the processing unit 810 is specifically configured to: in response to the registration rejection message, search for the first network on the PLMN of the other roaming operator within a first preset time period.
  • the processing unit 810 is also used to: when the terminal device fails to successfully register to the first network of the PLMN of the second roaming operator and the first preset time period has not timed out, continue searching for the first network on the PLMNs of roaming operators among other roaming operators except the second roaming operator within the first preset time period.
  • the processing unit 810 is further used to: when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator and the first preset time period expires, search for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area.
  • the processing unit 810 is further configured to: when the first preset time period has not timed out and the first network is not found on the PLMN of any roaming operator among the other roaming operators, Before the duration times out, a second network having a network standard lower than that of the first network is searched on a PLMN of at least one roaming operator in the roaming area.
  • the processing unit 810 is further used to: when the first preset time period times out and the first network has not been searched on the PLMNs of the other roaming operators, search for a second network with a network standard lower than that of the first network on the PLMNs of at least one roaming operator in the roaming area.
  • the processing unit 810 is further used to: when the first network is not found on the PLMNs of at least some of the roaming operators of the other roaming operators, search for a second network with a network standard lower than that of the first network on the PLMNs of at least one roaming operator in the roaming area.
  • the processing unit 810 is further used to: when the terminal device fails to successfully register with the first network of the PLMN of the second roaming operator, search for a second network with a network standard lower than the first network on the PLMN of at least one roaming operator in the roaming area.
  • the processing unit 810 is specifically configured to: preferentially search, on the PLMN of the first roaming operator, for the second network having a network standard lower than that of the first network.
  • the processing unit 810 is specifically used to: in response to the registration rejection message, prohibit the use of the first network of the PLMN of the first roaming operator within a second preset time period, and search for the first network on the PLMNs of other roaming operators within the first preset time period, and the first preset time period is less than the second preset time period.
  • the processing unit 810 is specifically configured to: in response to the registration rejection message, start a timer, where the duration of the timer is the first preset duration;
  • the first network is searched on the PLMN of the other roaming operator within the duration of the timer.
  • the registration rejection message includes any one of the following reason values: reason value #111, reason value #16, reason value #17.
  • the first network is a 5G network or a 4G network.
  • processing unit 810 can be used to execute each step performed by the terminal device in methods 400, 600 and 700.
  • processing unit 810 can be used to execute each step performed by the terminal device in methods 400, 600 and 700.
  • terminal device 800 here is embodied in the form of a functional unit.
  • the term "unit” here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combined logic circuit and/or other suitable components that support the described functions.
  • ASIC application specific integrated circuit
  • processor such as a shared processor, a dedicated processor or a group processor, etc.
  • memory for executing one or more software or firmware programs, a combined logic circuit and/or other suitable components that support the described functions.
  • the terminal device in Figure 8 may also be a chip or a chip system, for example: a system on chip (SoC).
  • SoC system on chip
  • Fig. 9 is a schematic structural diagram of a terminal device 900 provided in an embodiment of the present application.
  • the terminal device 900 is used to execute the corresponding steps and/or processes in the above method embodiment.
  • the terminal device 900 includes a processor 910, a transceiver 920, and a memory 930.
  • the terminal device 900 may correspond to the terminal device 110 shown in FIG. 2 above, the processor 910 may correspond to the processor 111 of the terminal device 110, and the transceiver 920 may integrate the function of the antenna 1 of the terminal device 110.
  • the processor 910, the transceiver 920 and the memory 930 communicate with each other through an internal connection path, and the processor 910 can implement the functions of the processor 910 in various possible implementations of the terminal device 900.
  • the memory 930 is used to store instructions, and the processor 910 is used to execute the instructions stored in the memory 930, or in other words, the processor 910 can call these stored instructions to implement the functions of the processor 910 in the terminal device 900.
  • the memory 930 may include a read-only memory and a random access memory, and provide instructions and data to the processor.
  • a portion of the memory may also include a non-volatile random access memory.
  • the memory may also store information about the device type.
  • the processor 910 may be used to execute instructions stored in the memory, and when the processor 910 executes instructions stored in the memory, the processor 910 is used to execute the various steps and/or processes of the above-mentioned method embodiment corresponding to the terminal device.
  • the transceiver 920 is used to: when searching for a first network on a public land mobile network PLMN of a first roaming operator in a roaming area, send a first registration request, wherein the first registration request is used to request that the terminal device be registered to the first network of the PLMN of the first roaming operator;
  • the transceiver 920 is further configured to: receive a registration rejection message in response to the first registration request, wherein the registration rejection message is used to indicate that the terminal device has not successfully registered with the first network of the PLMN of the first roaming operator, and is used to instruct the terminal device to search for a second network with a network standard lower than that of the first network on the PLMN of the first roaming operator;
  • the processor 910 is configured to: in response to the registration rejection message, search for the first network on PLMNs of other roaming operators in the roaming area except the first roaming operator;
  • the transceiver 920 is also used to send a second registration request to register the terminal device to the first network of the PLMN of the second roaming operator among the other roaming operators when the first network is searched on the PLMN of the second roaming operator.
  • the processor of the above-mentioned device may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.
  • each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software.
  • the steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software units in a processor for execution.
  • the software unit can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc.
  • the storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.
  • the embodiment of the present application provides a computer program product, when the computer program product is run on a terminal device, the terminal device executes the technical solution in the above embodiment. Its implementation principle and technical effect are similar to those of the above method-related embodiments, and will not be repeated here.
  • the embodiment of the present application provides a readable storage medium, the readable storage medium contains instructions, when the instructions are executed in a terminal device, the terminal device executes the technical solution of the above embodiment.
  • the implementation principle and technical effect are similar, and will not be repeated here.
  • the embodiment of the present application provides a chip, the chip is used to execute instructions, when the chip is running, the technical solution in the above embodiment is executed.
  • the implementation principle and technical effect are similar, and will not be repeated here.
  • all or part of the above embodiments may be implemented by software, hardware, firmware or any combination thereof.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.
  • the computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a high-density digital video disc (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.
  • a magnetic medium e.g., a floppy disk, a hard disk, a tape
  • an optical medium e.g., a high-density digital video disc (DVD)
  • DVD high-density digital video disc
  • SSD solid state disk
  • a and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A can be singular or plural, and B can be singular or plural.
  • the term "at least one of" or “at least one of" means all or any combination of the listed items.
  • “at least one of A, B, and C” may mean: A exists alone, B exists alone, C exists alone, A and B exist at the same time, B and C exist at the same time, and A, B, and C exist at the same time, where A may be singular or plural, B may be singular or plural, and C may be singular or plural.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be 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 distributed on multiple network units. Some or all of the units may 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, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions are implemented in the form of software functional 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 can be essentially or partly embodied in the form of a software product that contributes to the prior art.
  • the computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

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Abstract

本申请涉及通信领域，提供了一种漫游场景下的网络注册方法和终端设备。在该方法中，终端设备在第一漫游地运营商(例如，移动)的PLMN的高制式的第一网络(例如，4G网络)注册失败，在接收到用于指示在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络(例如，3G网络或2G网络)的注册拒绝消息的情况下，响应于该注册拒绝消息，终端设备在漫游地的其他漫游地运营商的PLMN上搜索高制式的第一网络，这样，在其他漫游地运营商的第二漫游地运营商(例如，电信)的PLMN上搜索到高制式的第一网络的情况下，终端设备发送注册请求以请求注册至高制式的第一网络，使得终端设备有更多的机会优先注册至高制式的第一网络，提高了用户体验。

Description

一种漫游场景下的网络注册方法和终端设备
本申请要求于2023年11月30日提交国家知识产权局、申请号为202311637625.4、申请名称为“一种漫游场景下的网络注册方法和终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，更具体地，涉及通信领域中一种漫游场景下的网络注册方法和终端设备。
背景技术
移动通信是目前全球广泛采用的通信方式。终端设备(例如，手机)需要搜索公共陆地移动网络(public land mobile network，PLMN)，在PLMN上完成网络注册后，才能进行正常的网络通信。目前，各个运营商之间允许国际漫游或国内漫游，简称运营商之间的漫游，不同的运营商具有不同的PLMN。例如，终端设备的归属运营商为运营商A，终端设备可以通过漫游方式注册至与运营商A签约漫游协议的其他运营商的网络。
在一种漫游场景中，若终端设备优先在漫游地的某个运营商(例如，运营商B)的PLMN上搜索到高制式网络(例如，4G网络)但在该运营商的PLMN的高制式网络注册失败，终端设备接收到包括例如原因值#111的注册拒绝消息，响应于该注册拒绝消息，终端设备会暂停禁用该运营商的PLMN上的高制式网络以及暂停漫游地的其他运营商的PLMN上的网络搜索，而是会优先在之前已经搜索到网络的该运营商的PLMN上搜索低制式网络(例如，2G网络或3G网络)，若该运营商支持终端设备漫游注册至低制式网络，那么，在终端设备搜索到该运营商的低制式网络且注册成功的情况下，终端设备会在低制式网络下通信，导致用户体验差。
发明内容
本申请实施例提供一种漫游场景下的网络注册方法和终端设备，终端设备在漫游地的一个漫游地运营商的PLMN的高制式网络注册失败时，响应于接收到的注册拒绝消息，终端设备会在漫游地的其他漫游地运营商的PLMN上搜索高制式网络以尝试注册至高制式网络，这样，在漫游地的其他漫游地运营商的PLMN上存在高制式网络的情况下，终端设备有更多的机会优先注册至高制式网络，提高了漫游场景下用户使用网络的体验。
第一方面，提供了一种漫游场景下的网络注册方法，包括：在漫游地的第一漫游地运营商的PLMN上搜索到第一网络的情况下，发送第一注册请求，第一注册请求用于请求将终端设备注册至第一漫游地运营商的PLMN的第一网络；接收响应于第一注册请求的注册拒绝消息，注册拒绝消息用于指示终端设备未成功注册至第一漫游地运营商的PLMN的第 一网络，且用于指示终端设备在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络；响应于注册拒绝消息，在漫游地的除第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索第一网络；在其他漫游地运营商中的第二漫游地运营商的PLMN上搜索到第一网络的情况下，发送第二注册请求，以将终端设备注册至第二漫游地运营商的PLMN的第一网络。
本申请实施例提供的漫游场景下的网络注册方法，终端设备在例如第一漫游地运营商(例如，移动)的PLMN的高制式的第一网络(例如，4G网络)注册失败，且接收到用于指示在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络(例如，3G网络或2G网络)的注册拒绝消息的情况下，响应于注册拒绝消息，终端设备会在漫游地的除该漫游地运营商以外的其他漫游地运营商的PLMN上搜索高制式的第一网络，这样，在例如第二新漫游地运营商(例如，电信)的PLMN上搜索到高制式的第一网络的情况下，终端设备发送注册请求以请求注册至第二漫游地运营商的高制式的第一网络，使得终端设备有更多的机会优先注册至高制式的第一网络，避免了现有技术中终端设备在例如第一漫游地运营商的PLMN上搜索低制式的第二网络且最终注册至低制式的第二网络导致的用户体验差的问题，有效地提高了漫游场景下用户使用网络的体验。
在一些实施例中，在上述响应于注册拒绝消息，在漫游地的除第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索第一网络的步骤中，响应于注册拒绝消息，在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络。
本申请实施例提供的漫游场景下的网络注册方法，通过设置第一预设时长，限定在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络，可以避免终端设备由于长时间持续搜索第一网络导致终端设备迟迟无法入网的问题，进一步提高了漫游场景下用户使用网络的体验。
在一些实施例中，在上述在其他漫游地运营商中的第二漫游地运营商的PLMN上搜索到第一网络的情况下，发送第二注册请求，以将终端设备注册至第二漫游地运营商的PLMN的第一网络的步骤之后，方法还包括：在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络且第一预设时长未超时的情况下，在第一预设时长内在其他漫游地运营商中除第二漫游地运营商以外的漫游地运营商的PLMN上继续搜索第一网络。
这样，能够提高终端设备搜索到第一网络的机会，以提高注册至第一网络的机会，提高漫游场景下用户使用网络的体验。
在一些实施例中，在上述在其他漫游地运营商中的第二漫游地运营商的PLMN上搜索到第一网络的情况下，发送第二注册请求，以将终端设备注册至第二漫游地运营商的PLMN的第一网络的步骤之后，方法还包括：在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络且第一预设时长超时的情况下，在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
本申请实施例提供的漫游场景下的网络注册方法，在第一预设时长超时的情况下终端设备也并未成功注册至例如第二漫游地运营商的PLMN的第一网络，为了使得终端设备尽快入网，终端设备不再搜索第一网络，而是在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络，以注册至第二网络，降低了终端设备长时间无法入网的风险，以提高终端设备尽快入网的概率。
在一些实施例中，方法还包括：在第一预设时长未超时且在其他漫游地运营商中任一个漫游地运营商的PLMN上均未搜索到第一网络的情况下，在第一预设时长超时之前，在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
本申请实施例提供的漫游场景下的网络注册方法，在第一预设时长未超时在其他漫游地运营商中任一个漫游地运营商的PLMN上均未搜索到第一网络的情况下，意味着终端设备在第一预设时长超时之前已经遍历了其他漫游地运营商中的所有漫游地运营商，遍历结果是在任一个漫游地运营商的PLMN上均未搜索到第一网络，这样，在已经确知其他漫游地运营商的PLMN均未搜索到第一网络的情况下，提前结束搜索时长(即第一预设时长)以能够提前(即在第一预设时长超时之前)在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络，减少了不必要的搜索时长，以便于终端设备更早地搜索其他网络以尽早接入网络，提高漫游场景下用户使用网络的体验。
在一些实施例中，方法还包括：在第一预设时长超时且在其他漫游地运营商的PLMN上还未搜索到第一网络的情况下，在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
本申请实施例提供的漫游场景下的网络注册方法，在第一预设时长超时后不再搜索第一网络，而是在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络，可以使得终端设备通过搜索其他网络以尽量接入网络，降低终端设备长时间无法入网的风险，以提高终端设备尽快入网的概率。
在一些实施例中，方法还包括：在其他漫游地运营商的至少部分漫游地运营商的PLMN上未搜索到第一网络的情况下，在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
这样，可以使得终端设备通过搜索其他网络以尽量接入网络，降低终端设备长时间无法入网的风险，以提高终端设备尽快入网的概率。
在一些实施例中，方法还包括：在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络的情况下，在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
这样，可以使得终端设备通过搜索其他网络以尽量接入网络，降低终端设备长时间无法入网的风险，以提高终端设备尽快入网的概率。
在一些实施例中，在上述在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的网络的步骤中，优先在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
本申请实施例提供的漫游场景下的网络注册方法，在搜索低制式的第二网络的过程中，终端设备优先在之前已经搜索到第一网络的第一漫游地运营商的PLMN上搜索第二网络，这样，对于搜索低制式的第二网络的过程可以尽可能遵守现有协议，减少对协议的改动，达到简化了设计的目的。
在一些实施例中，在上述响应于注册拒绝消息，在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络，包括：响应于注册拒绝消息，在第二预设时长内禁止使用第一漫游地运营商的PLMN的第一网络，且在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络，第一预设时长小于第二预设时长。
本申请实施例提供的漫游场景下的网络注册方法，由于第一漫游地运营商的PLMN的第一网络注册失败，通过限定一个第二预设时长，在第二预设时长内禁止终端设备使用第一漫游地运营商的PLMN的第一网络，可以避免短时间内终端设备可能多次尝试注册第一漫游地运营商的PLMN的第一网络且均未成功导致终端设备迟迟无法入网的问题。
在一些实施例中，在上述响应于注册拒绝消息，在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络的步骤中，响应于注册拒绝消息，开启定时器，定时器的时长为第一预设时长；在定时器的时长内在其他漫游地运营商的PLMN上搜索第一网络。
在一些实施例中，注册拒绝消息包括以下任一个原因值：原因值#111、原因值#16、原因值#17。
在一些实施例中，第一网络为5G网络或4G网络。
在一些实施例中，第一网络为6G网络或更高制式的网络。
第二方面，提供一种终端设备，终端设备用于执行上述第一方面提供的方法。具体地，终端设备可以包括用于执行上述第一方面中任一种可能实现方式的模块。
第三方面，提供一种终端设备，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面中任一种可能实现方式中的方法。可选地，该终端设备还包括存储器。可选地，该装置还包括通信接口，处理器与通信接口耦合。
第四方面，提供一种计算机可读存储介质，其上存储有计算机程序，计算机程序被装置执行时，使得装置实现上述第一方面中任一种可能实现方式中的方法。
第五方面，提供一种包含指令的计算机程序产品，指令被计算机执行时使得装置实现上述第一方面中任一种可能实现方式中的方法。
第六方面，提供一种芯片，包括：输入接口、输出接口、处理器和存储器，输入接口、输出接口、处理器以及存储器之间通过内部连接通路相连，处理器用于执行存储器中的代码，当代码被执行时，处理器用于执行上述第一方面中任一种可能实现方式中的方法。
附图说明
图1是本申请实施例提供的移动通信系统的示意性场景图。
图2是本申请实施例提供的终端设备的结构示意图。
图3是本申请实施例提供的现有技术的漫游场景下的网络注册方法。
图4是本申请实施例提供的漫游场景下的网络注册方法的示例性流程图。
图5是本申请实施例提供的漫游场景下的网络注册方法的设备间交互的示意性流程图。
图6是本申请实施例提供的漫游场景下的网络注册方法的另一示意性流程图。
图7是本申请实施例提供的漫游场景下的网络注册方法的另一示意性流程图
图8是本申请实施例提供的终端设备的示例性框图。
图9本申请实施例提供的终端设备的示意性结构图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
首先，对本申请实施例涉及的相关概念或术语做简单介绍。
公共陆地移动网络(public land mobile network，PLMN)
PLMN是由政府或其批准的经营者为公众提供陆地移动通信业务而建立、经营的网络。PLMN与公众交换电话网互连，形成整个地区或国家规模的通信网。PLMN是移动通信网络的代名词，具体到我们国家，每个移动通信的运营商的网络整体上可以看做一个PLMN，中国移动、中国联通和中国电信的网络是不同的PLMN。
PLMN由移动国家号码(mobile contrary code，MCC)和移动网号(mobile netcode，MNC)组成。MCC唯一表示移动用户的所属国家。例如，中国的MCC为460。MNC可以唯一表示该国家中的网络。例如，中国移动(简称移动)的MNC可以包括00，中国联通(简称联通)的MNC包括01，中国电信(简称电信)的MNC包括11，中国广电(简称广电)的MNC包括15。每个运营商可以包括至少一个PLMN。
表1示出的是不同运营商对应的不同PLMN。
表1
如表1所示，移动的PLMN可以包括46000、46002、46004、46007以及46008；联通的PLMN可以包括46001、46006、46009和46010。电信的PLMN可以包括46003、46011和46012；广电的PLMN可以包括46015。未来各运营商的PLMN还可以包括其他更多的PLMN，本申请在此不做限定。
归属PLMN(home PLMN，HPLMN)
HPLMN为终端设备归属的PLMN，称为归属PLMN。终端用户的全球用户身份模块(universal subscriber identity module，USIM)卡(也可称为全球用户识别卡)上的国际移动用户识别码(international mobile subscriber identification number，IMSI)号中包含的MCC和MNC与HPLMN上的MCC和MNC是一致的。对于某一终端设备来说，该终端设备的归属PLMN只有一个。例如，移动的PLMN包括4个PLMN，某一终端设备的归属PLMN是4个PLMN中的一个PLMN。
归属地运营商和漫游地运营商
归属地运营商是终端设备的卡的运营商，或者说，归属地运营商是终端设备的HPLMN所属的运营商。例如，终端设备的卡是中国移动的卡，那么，中国移动就是该终端设备的归属地运营商。
漫游地运营商是漫游地的运营商，是归属地运营商以外的其他运营商。例如，以国际漫游为例，小王是移动的用户，移动是小王的手机的归属地运营商，如果他出差在德国，那么，位于德国本地的例如TMO的运营商即为漫游地运营商。
若归属地运营商与某个漫游地运营商签约了漫游协议，那么，在漫游场景下，终端设备是能够接入该漫游地运营商的PLMN的。例如，若终端设备的归属地运营商是移动，移动与德国电信的TMO签约了漫游协议，那么，当该终端设备漫游至德国后，该终端设备能够漫游接入TMO的PLMN。
应理解，本申请实施例不仅可以应用于国际漫游场景，也可以应用于国内漫游场景中。为了节省网络建设的成本，运营商之间允许国内漫游是一种降低网络建设成本的一种重要手段。在国内漫游场景中，例如，终端设备的归属地运营商是联通，联通与移动签订漫游协议，那么，移动是漫游地运营商，联通的终端设备可以通过漫游方式接入移动的网络。
本申请实施例的技术方案适用于任何支持漫游服务的通信系统。例如：全球移动通讯(global system for mobile communications，GSM)系统，通用分组无线服务(general packet radio service，GPRS)系统，宽带码分多址(wideband code division multiple access，WCDMA)、时分码分多址(time-division code division multiple access，TD-SCDMA)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、第五代新无线(5th generation new radio，5G NR)或未来的第六代(6th generation，6G)系统等。
图1是本申请实施例提供的移动通信系统的示意性场景图。参考图1，该移动通信系统包括终端设备、至少一个接入网设备和至少一个核心网设备，本申请的实施例对移动通信系统中核心网设备、接入网设备和终端设备的数量不做限定。终端设备通过无线的方式与接入网设备相连，接入网设备通过无线或有线方式与核心网设备连接。核心网设备与接入网设备可以是独立的不同的物理设备，也可以是将核心网设备的功能与接入网设备的逻辑功能集成在同一个物理设备上，还可以是一个物理设备上集成了部分核心网设备的功能和部分的接入网设备的功能。终端设备可以是固定位置的，也可以是可移动的。
接入网设备是终端设备通过无线方式接入到该移动通信系统中的设备，可以是基站NodeB、演进型基站(evolved NodeB，eNodeB)、发送接收点(transmission reception point，TRP)、5G移动通信系统中的下一代基站(next generation NodeB，gNB)、未来移动通信系统中的基站或WiFi系统中的接入节点，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，还可以是中继站、车载设备、可穿戴设备以及未来演进的PLMN网络中的网络设备等。本申请的实施例对接入网设备所采用的具体技术和具体设备形态不做限定。
终端设备是任意可以使用SIM卡进行通信的设备，终端设备也可以称为终端Terminal、用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终 端(mobile terminal，MT)等。终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、智能手表等等。本申请的实施例对终端设备所采用的具体技术和具体设备形态不做限定。
不同的核心网设备支持不同的运营商。如图1所示，核心网设备131、核心网设备132、核心网设备133和核心网设备134支持各自对应的运营商，即，核心网设备131支持运营商B、核心网设备132支持运营商C、核心网设备133支持运营商D以及核心网设备134支持运营商A。
对于一个运营商，该运营商的核心网设备通过该运营商的接入网设备与终端设备通信连接。
一个接入网设备可以支持一个或多个运营商。当一个接入网设备支持多个运营商时，该多个运营商共建共享该接入网设备的网络，以减少网络建设的成本。尤其对于目前的5G网络的接入网设备，同样的覆盖范围，所需的5G网络的接入网设备的数目是4G网络的接入网设备的3-4倍，通过共建共享接入网设备的方式能有效减少网络建设的成本。
在一示例中，如图1所示，接入网设备121、接入网设备122、接入网设备124和接入网设备125分别支持一个运营商，每个运营商建立了各自的接入网设备。
在另一示例中，如图1所示，接入网设备123支持两个运营商：运营商B和运营商C，即，运营商B和运营商C共建接入网设备123，这样，运营商B和运营商C可以共享接入网设备123的网络，以减少网络建设的成本。例如，电信和联通可以联合共建5G独立组网(standalone，SA)基站，这样，电信和联通可以共享同一个基站的5G网络。再例如，广电和移动可以联合共建5G SA基站，这样，广电和移动也可以共享同一个基站的5G网络。
需要说明的是，若接入网设备支持多个网络，多个运营商仅共享双方共建的网络。例如，某个接入网设备支持4G网络和5G网络，4G网络是运营商B独立建设的，运营商B和运营商C仅共建了5G网络，那么，运营商B和运营商C只能共享5G网络，运营商C无法使用该接入网设备的4G网络。
在非漫游场景中，终端设备可以接入归属地运营商的接入网设备的网络中，在漫游场景中，终端设备可以接入与归属地运营商签订漫游协议的漫游地运营商的接入网设备的网络中。如图1所示，终端设备110的归属地运营商是运营商A，接入网设备121是运营商B的接入网设备，接入网设备122是运营商C的接入网设备，接入网设备123是运营商B和运营商C共建的5G网络的接入网设备，接入网设备124是运营商D的接入网设备，接入网设备125是运营商A的接入网设备。
假设，运营商A与运营商B和运营商C均签订有5G网络的漫游协议，接入网设备121、接入网设备122和接入网设备123均支持各自运营商的5G网络。那么，终端设备110可以通过漫游方式接入接入网设备121、接入网设备122和接入网设备123的各个运营商的5G网络，可直接接入归属地运营商(运营商A)的接入网设备125的网络，无法接入接入网设备124的网络。需要说明的是，由于接入网设备123是运营商B和运营商C共建共享的5G网络的接入网设备，且运营商A与运营商B和运营商C均签订有5G网络的漫游协议，因此，在漫游场景中，终端设备110在运营商B和运营商C之间漫游时，均可通过漫游方式接入接入网设备123，即终端设备110通过漫游方式接入同一个接入网设备的 5G网络。
再假设，运营商A与运营商B签订有4G网络的漫游协议，运营商A与运营商C签订有5G网络的漫游协议，接入网设备121支持运营商B的4G网络，接入网设备122支持运营商C的5G网络，接入网设备123支持运营商C的5G网络以及支持运营商B的4G网络。那么，终端设备110可以通过漫游方式可以接入接入网设备121的4G网络、接入接入网设备122的5G网络、接入接入网设备123的运营商C的5G网络，无法接入接入网设备123的运营商B的5G网络以及接入网设备124的网络，可直接接入归属地运营商(运营商A)的接入网设备125的网络。需要说明的是，虽然接入网设备123是运营商B和运营商C共建共享的5G网络的接入网设备，但运营商A仅与运营商C签订有5G网络的漫游协议，因此，在漫游场景中，终端设备110只能通过漫游方式接入接入网设备123的运营商C的5G网络而无法接入接入网设备123的运营商B的5G网络。
应理解，图1示出的移动通信系统仅为示意性说明，不应对本申请实施例构成限定。例如，移动通信系统中还可以更多或更少的核心网设备、接入网设备以及终端设备。
图2示出了终端设备110的结构示意图。终端设备110可以包括但不限于处理器111、天线1、天线2、移动通信模块112、无线通信模块113、用户标识模块(subscriber identification module，SIM)卡接口114等部件。示例性地，终端设备110还可以包括音频模块115、显示屏116、摄像头117、传感器模块118、外部存储器接口、内部存储器、通用串行总线(universal serial bus，USB)接口、充电管理模块、电源管理模块、电池、按键、马达、指示器等部件。
可以理解的是，本申请实施例示意的结构并不构成对终端设备110的具体限定。在本申请另一些实施例中，终端设备100可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
处理器111可以包括一个或多个处理单元，例如：处理器111可以包括应用处理器(application processor，AP)，调制解调处理器，图形处理器(graphics processing unit，GPU)，图像信号处理器(image signal processor，ISP)，控制器，存储器，视频编解码器，数字信号处理器(digital signal processor，DSP)，基带处理器，和/或神经网络处理器(neural-network processing unit，NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。其中，控制器可以是终端设备110的神经中枢和指挥中心。控制器可以根据指令操作码和时序信号，产生操作控制信号，完成取指令和执行指令的控制。
处理器110中还可以设置存储器，用于存储指令和数据。在一些实施例中，处理器110中的存储器为高速缓冲存储器。该存储器可以保存处理器110刚用过或循环使用的指令或数据。如果处理器110需要再次使用该指令或数据，可从存储器中直接调用。避免了重复存取，减少了处理器110的等待时间，因而提高了系统的效率。
在本申请实施例中，处理器110在漫游场景下搜索网络，搜索到漫游地的一个漫游地运营商的PLMN的高制式网络(例如，4G网络或5G网络)后发送注册请求以请求注册网络，在注册成功的情况下驻留在该网络下进行通信，在注册失败的情况下可 以在漫游地的其他漫游地运营商的PLMN上搜索相同网络制式的网络，以尝试注册至高制式网络。以及，在其他漫游地运营商的PLMN上未搜索到高制式网络的情况下，在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式较低的低制式网络(例如，3G网络或2G网络)，以让终端设备尽量接入网络。
终端设备110的无线通信功能可以通过天线1、天线2、移动通信模块112、无线通信模块113、调制解调处理器以及基带处理器等实现。
天线1和天线2用于发射和接收电磁波信号。终端设备110中的每个天线可用于覆盖单个或多个通信频带。不同的天线还可以复用，以提高天线的利用率。例如：可以将天线1复用为无线局域网的分集天线。在另外一些实施例中，天线可以和调谐开关结合使用。
移动通信模块112可以提供应用在终端设备110上的包括2G/3G/4G/5G等无线通信的解决方案。移动通信模块112可以包括至少一个滤波器，开关，功率放大器，低噪声放大器(low noise amplifier，LNA)等。移动通信模块112可以由天线1接收电磁波，并对接收的电磁波进行滤波，放大等处理，传送至调制解调处理器进行解调。移动通信模块112还可以对经调制解调处理器调制后的信号放大，经天线1转为电磁波辐射出去。在一些实施例中，移动通信模块112的至少部分功能模块可以被设置于处理器111中。在一些实施例中，移动通信模块112的至少部分功能模块可以与处理器111的至少部分模块被设置在同一个器件中。
无线通信模块113可以提供应用在终端设备110上的包括无线局域网(wireless local area networks，WLAN)(如无线保真(wireless fidelity，Wi-Fi)网络)，蓝牙(bluetooth，BT)，全球导航卫星系统(global navigation satellite system，GNSS)，调频(frequency modulation，FM)，近距离无线通信技术(near field communication，NFC)，红外技术(infrared，IR)等无线通信的解决方案。无线通信模块113可以是集成至少一个通信处理模块的一个或多个器件。无线通信模块113经由天线2接收电磁波，将电磁波信号调频以及滤波处理，将处理后的信号发送到处理器111。无线通信模块113还可以从处理器111接收待发送的信号，对其进行调频，放大，经天线2转为电磁波辐射出去。
在一些实施例中，终端设备110的天线1和移动通信模块112耦合，天线2和无线通信模块113耦合，使得终端设备110可以通过无线通信技术与网络以及其他设备通信。所述无线通信技术可以包括GSM、GPRS、WCDMA、TD-SCDMA、LTE、FDD、TDD、5G NR或6G系统、BT、GNSS、WLAN、NFC、FM、和/或IR技术等。所述GNSS可以包括全球卫星定位系统(global positioning system，GPS)，全球导航卫星系统(global navigation satellite system，GLONASS)，北斗卫星导航系统(beidou navigation satellite system，BDS)，准天顶卫星系统(quasi-zenith satellite system，QZSS)和/或星基增强系统(satellite based augmentation systems，SBAS)。
终端设备的SIM卡支持各个运营商的不同的移动网络，终端设备可以通过SIM卡以及移动通信模块112与各个移动网络交互，实现移动通话和数据通信。例如，终端设备的SIM卡是电信的卡，终端设备可以通过SIM卡以及移动通信模块112与电信网络交互，实现在电信网络的移动通话和数据通信。
SIM卡接口114用于连接SIM卡。SIM卡可以通过插入SIM卡接口114，或从SIM 卡接口114拔出，实现和终端设备110的接触和分离。终端设备110可以支持1个或N个SIM卡接口，N为大于1的正整数。SIM卡接口114可以支持Nano SIM卡，Micro SIM卡，SIM卡等。同一个SIM卡接口114可以同时插入多张卡。所述多张卡的类型可以相同，也可以不同。SIM卡接口114也可以兼容不同类型的SIM卡。SIM卡接口114也可以兼容外部存储卡。终端设备110通过SIM卡和各个运营商的网络交互，实现通话以及数据通信等功能。
图3是本申请实施例提供的现有技术的漫游场景下的网络注册方法。其中，终端设备漫游至漫游地，需要通过漫游方式接入漫游地的网络中，运营商B是漫游地的运营商，接入网设备A支持运营商B的4G网络，接入网设备B支持运营商B的3G网络和2G网络。
在步骤S310中，终端设备漫游至漫游地，搜索到漫游地的运营商B的PLMN的4G网络。
在漫游场景中，终端设备按照网络制式由高到低的顺序搜索网络，优先搜索到运营商B的PLMN的4G网络。应理解，相比于3G网络和2G网络，4G网络是高制式网络。
在步骤S320中，终端设备向接入网设备A发送4G网络的注册请求，以请求注册至运营商B的PLMN的4G网络。
在步骤S330中，响应于该注册请求，接入网设备A向终端设备发送注册拒绝消息，用于指示终端设备未成功注册至运营商B的PLMN的4G网络。其中，注册拒绝消息中包括网络注册失败的原因值。
需要说明的是，如果终端设备注册网络失败，一般有两种原因，一种是网络原因，比如网络中断、系统失败等原因；另一种是用户原因，比如用户没有签约GPRS功能导致网络的拒绝、用户没有签约漫游协议导致网络的拒绝等。终端设备会根据接入网设备反馈的注册拒绝消息中的原因值(cause value)来判定注册失败的原因。
示例性地，比较常见的用户原因的原因值为：Cause#7，表示GPRS服务不允许；Cause#11，表示PLMN不允许；。比较常见的网络原因的原因值为：Cause#16，表示移动交换中心(mobile switching center，MSC)暂时无法访问；Cause#17，表示网络失败(network failure)；Cause#111，表示协议异常(protocol error)。
在上述步骤S330中，注册拒绝消息中包括的原因值可以是例如Cause#16、Cause#17和Cause#111等的网络原因导致的网络注册失败。终端设备基于原因值，执行步骤S340。
在步骤S340中，终端设备在预设时长(例如，12分钟)内禁用运营商B的PLMN的4G网络，且优先在运营商B的PLMN上搜索低制式的3G网络或2G网络。
终端设备接收到接入网设备A发送的注册拒绝消息，根据注册拒绝消息中的原因值能够确定出网络注册失败的原因，基于协议规定，终端设备在预设时长(例如，12分钟)内禁用运营商B的4G网络，且优先在运营商B的PLMN上搜索网络制式低于4G的3G或2G网络。
应理解，这里的优先在运营商B的PLMN上搜索低制式的3G网络或2G网络，表示的是，在未成功注册至运营商B的PLMN的4G网络后，终端设备会首先在运营 商B的PLMN上搜索3G网络或2G网络，以尝试在运营商B的PLMN上注册3G网络或2G网络，在此期间，终端设备暂时不会在其他运营商的PLMN上搜索任意制式的网络，只有在运营商B的PLMN的3G网络或2G网络上注册失败或者未搜索到3G网络或2G网络的情况下，终端设备才会尝试在其他运营商的PLMN上搜索网络。
在步骤S350中，终端设备搜索到运营商B的PLMN的3G网络。
在步骤S360中，终端设备向接入网设备B发送3G网络的注册请求，以请求注册至运营商B的PLMN的3G网络。
在步骤S370中，接入网设备B向终端设备发送注册成功的消息。
此时，意味终端设备成功注册至运营商B的3G网络。
在步骤S380中，在预设时长超时后，终端设备解除运营商B的PLMN的4G网络的禁用状态，执行重选、或重定向等过程回到4G网络重新尝试注册4G网络，若注册失败则继续执行步骤S340以及后续步骤最终注册至3G网络，若注册成功则驻留在4G网络。
可以看出，在上述漫游场景中，若终端设备优先在一个漫游地运营商(例如，运营商B)的PLMN上搜索到高制式网络(例如，4G网络)但在该漫游地运营商的PLMN的高制式网络注册失败时，终端设备响应于接收到的包括例如原因值#111的注册拒绝消息，会暂停使用该漫游地运营商的高制式网络以及暂停在其他漫游地运营商的PLMN上搜索网络，而是会优先在该漫游地运营商的PLMN上搜索低制式网络(例如，2G网络或3G网络)，在该漫游地运营商的PLMN上搜索到低制式网络的情况下终端设备会通过漫游方式注册至该漫游地运营商的低制式网络。
然而，在上述漫游场景的网络注册过程中，若终端设备本身支持漫游注册至其他漫游地运营商(例如，运营商C)的PLMN的高制式网络，但由于终端设备在某个漫游地运营商(例如，运营商B)的PLMN的高制式网络注册失败且接收到的包括例如原因值#111的注册拒绝消息后会暂停其他漫游地运营商的PLMN的搜索，导致终端设备只能注册至低制式网络而无法注册至其他漫游地运营商的高制式网络，用户体验较差。
基于此，本申请实施例提供了一种漫游场景下的网络注册方法，终端设备在漫游地的一个漫游地运营商的PLMN的高制式网络注册失败时，响应于接收到的注册拒绝消息，终端设备会在漫游地的其他漫游地运营商的PLMN上搜索高制式网络，以尝试注册至高制式网络，这样，在漫游地的其他漫游地运营商的PLMN上存在高制式网络的情况下，终端设备有更多的机会优先注册至高制式网络，提高了用户体验。
本申请实施例的漫游场景下的网络注册方法，可以应用于任意的漫游场景。例如，该方法可以应用于终端设备在漫游地初次入网、在漫游地进行网络重选、在漫游地重启终端设备再次入网等场景中。
以下，结合图4至图7，对本申请实施例的漫游场景下的网络注册方法做详细描述。
在本申请实施例中，以终端设备作为执行方法400的执行主体为例，对方法400做详细描述。作为示例而非限定，执行方法400的执行主体也可以是对应终端设备的芯片或处理器。
图4是本申请实施例提供的漫游场景下的网络注册方法400的示例性流程图。图5是本申请实施例提供的漫游场景下的网络注册方法400的设备间交互的示意性流程图。
在步骤S410中，在漫游地的第一漫游地运营商的PLMN上搜索到第一网络的情况下，发送第一注册请求，第一注册请求用于请求注册至第一漫游地运营商的PLMN的第一网络。
在上述步骤中，终端设备可以自动搜索网或根据用户输入的搜网指令进行网络搜索，若用户当前处于漫游地，用户的终端设备搜索到漫游地的第一漫游地运营商的PLMN的第一网络，终端设备会向接入网设备发送第一注册请求，以请求注册至当前搜索到的第一漫游地运营商的PLMN的第一网络。应理解，第一漫游地运营商为漫游地的任一个运营商。
在搜索网络的过程中，终端设备可以按照网络制式由高到低的顺序搜索网络，因此，终端设备搜索到的第一网络可以认为是终端设备当前能够(或允许)搜索到的网络制式最高的网络。例如，第一网络为4G网络，可以认为4G网络是终端设备当前能够搜索到的网络制式最高的网络，对于5G网络，可能由于之前注册失败或未搜索到信号等原因导致终端设备当前并未成功搜索到5G网络。再例如，第一网络为5G网络，可以认为5G网络是终端设备能够搜索到的网络制式最高的网络。再例如，第一网络为3G网络，可以认为3G网络是终端设备能够搜索到的网络制式最高的网络，对于4G网络或5G网络，可能由于之前注册失败或未搜索到信号等原因导致终端设备当前并未成功搜索到相关网络。
应理解，对于第一漫游地运营商包括多个PLMN的情况，终端设备搜索到的第一漫游地运营商的PLMN的第一网络是第一漫游地运营商的任一个PLMN的第一网络，此处并不做任何限定，以实际场景中终端设备搜索到的具体的PLMN为准。
参考图5，以接入网设备#1支持第一漫游地运营商的第一网络为例。示例性地，在步骤S411中，在漫游地的第一漫游地运营商的PLMN上搜索到的第一网络的情况下，终端设备向接入网设备#1发送第一注册请求。
在步骤S420中，终端设备接收响应于第一注册请求的注册拒绝消息。其中，注册拒绝消息用于指示终端设备未成功注册至第一漫游地运营商的PLMN的第一网络，且用于指示终端设备在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
可以理解，相比于第一网络，第二网络是低制式网络，第一网络是高制式网络。
在该步骤中，接入网设备接收到第一注册请求，响应于第一注册请求，向终端设备发送注册拒绝消息，终端设备接收注册拒绝消息。根据该注册原因消息，终端设备确知以下两个事情：第一，终端设备未成功注册至请求注册的第一漫游地运营商(例如，移动)的PLMN的第一网络(例如，4G网络)；第二，终端设备需要在第一漫游地运营商(例如，移动)的PLMN上搜索网络制式低于第一网络(例如，4G网络)的第二网络(例如，3G网络或2G网络)。
应理解，注册拒绝消息指示终端设备在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的期间，终端设备是不会在其他漫游地运营商的PLMN上搜索任意网络制式的网络的。
注册拒绝消息包括用于指示注册失败的原因值。本申请对于原因值的具体内容不做任何限定，只要该原因值能够表达“终端设备未成功注册至第一漫游地运营商的PLMN的第一网络”，且能够表达“终端设备在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络”的含义即可。一般情况下，本申请的注册拒绝消息中的原因值表示的是由于网络原因导致注册失败的原因值。
示例性地，原因值可以是以下任一种：原因值#111、原因值#16、原因值#17。其中， 原因值#111表示协议异常(protocol error)，原因值#16表示MSC暂时无法访问，原因值#17表示网络失败(network failure)。这3个原因值均表示的是由于网络原因导致注册失败的原因。
对于原因值#111，终端设备在一次注册失败后就可以执行步骤S430，即，终端设备在接收到第一个包括原因值#111的注册拒绝消息后就可以执行步骤S430。
对于原因值#16和原因值#17，协议规定，终端设备可以有连续5次机会进行网络注册，也就是说，只要未成功进行网络注册，终端设备可以发起5次注册请求以请求注册至网络。因此，为了最大程度地遵守协议，在本申请实施例中，终端设备可以在第5次发送注册请求且未成功注册网络后执行步骤S430，即，终端设备在接收到第5个包括原因值#16或原因值#17的注册拒绝消息后就可以执行步骤S430。
参考图5，继续以接入网设备#1支持第一漫游地运营商的第一网络为例，示例性地，在步骤S421中，接入网设备#1接收到终端设备发送的第一注册请求后，响应于该第一注册请求，向终端设备发送注册拒绝消息。
在步骤S430中，终端设备响应于注册拒绝消息，在漫游地的除第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索第一网络。
在该步骤中，终端设备接收到接入网设备发送的注册拒绝消息，并不会类似现有技术中在第一漫游地运营商(例如，移动)的PLMN上搜索网络制式低于第一网络(例如，4G网络)的第二网络(例如，3G网络或2G网络)，而是在漫游地的除第一漫游地运营商(例如，移动)以外的其他漫游地运营商(例如，联通、电信或广电等)的PLMN上搜索第一网络(例如，4G网络)。这样，终端设备在其他漫游地运营商上搜索高制式的第一网络，可以使得终端设备有更多机会尽早接入高制式的第一网络，以提高用户体验。
需要说明的是，这里的其他漫游地运营可以是漫游地的除第一漫游地运营商以外的至少一个漫游地运营商，不一定是漫游地的除第一漫游地运营以外的全部运营商，此处不做任何限定。例如，终端设备从国外漫游至中国，中国有4个漫游地运营商，第一漫游地运营为移动，那么，其他漫游地运营商可以是联通、电信和广电中的至少一个。
还需要说明的是，终端设备在其他漫游地运营商的PLMN上搜索第一网络，表示的是终端设备能够在其他漫游地运营商的PLMN上搜索第一网络，终端设备不一定遍历搜索完其他漫游地运营商中的每个漫游地运营商。例如，其他漫游地运营商包括3个漫游地运营商，搜网过程中，终端设备首先在其中一个漫游地运营商上搜索且成功注册到第一网络，那么，终端设备就没必要在其余2个漫游地运营商上继续搜索第一网络。
应理解，终端设备在其他漫游地运营商的PLMN上搜索第一网络的期间，终端设备是不会在第一漫游地运营商的PLMN上搜索任意制式的网络的，只有在其他漫游地运营商的PLMN上未搜索到第一网络或针对第一网络注册失败的情况下，才有可能在第一漫游地运营商的PLMN上搜索低制式的网络。
在步骤S440中，终端设备在其他漫游地运营商中的第二漫游地运营商的PLMN上搜索到第一网络的情况下，发送第二注册请求，以将终端设备注册至第二漫游地运营商的PLMN的第一网络。
也就是说，终端设备在第二漫游地运营商的PLMN上搜索到了高制式的第一网络，那么，终端设备向接入网设备发送第二注册请求，以将终端设备注册至第二漫游地运 营商的PLMN的第一网络。在终端设备成功注册的情况下，接入网设备向终端设备发送注册成功消息，以指示终端设备成功注册至第二漫游地运营商的PLMN的第一网络，此后，终端设备可以在第二漫游地运营商的PLMN的第一网络上进行通信。其中，第二漫游地运营商是漫游地的除第一漫游地运营商以外的任一个运营商。
在一示例中，第二漫游地运营商与第一漫游地运营商可以共建共享同一个接入网设备，例如图1所示的接入网设备123，第二漫游地运营商与第一漫游地运营商可以共享同一个接入网设备的第一网络。在该示例中，终端设备向同一个接入网设备发送第一注册请求和第二注册请求。
在另一示例中，第二漫游地运营商与第一漫游地运营商各自使用不同的接入网设备。参考图5，以接入网设备#1支持第一漫游地运营商的第一网络以及接入网设备#2支持第二漫游地运营商的第一网络为例，在步骤S441中，终端设备向接入网设备#2发送第二注册请求，以请求注册至第二漫游地运营商的PLMN的第一网络，在终端设备成功注册的情况下，在步骤S450中，接入网设备#2向终端设备发送注册成功消息，以指示终端设备成功注册至第二漫游地运营商的PLMN的第一网络。此后，终端设备可以在第二漫游地运营商的PLMN的第一网络上进行通信。
应理解，对于第二漫游地运营商包括多个PLMN的情况，终端设备搜索到的第二漫游地运营商的PLMN的第一网络是第二漫游地运营商的任一个PLMN的第一网络，此处并不做任何限定，以实际场景中终端设备搜索到的具体的PLMN为准。
作为一个具体示例，终端设备的归属地运营商是德国电信的TMO，该终端设备的用户从德国到中国，中国的4个运营商(移动、联通、电信和广电)是该终端设备的漫游地运营商，该终端设备开机后搜索到移动(第一漫游地运营商的一例)的一个PLMN的4G网络(第一网络的一例)，发送注册请求，以请求注册至移动的PLMN的4G网络。在该终端设备对移动的4G网络注册失败接收到包括例如原因值#111的注册拒绝消息后，终端设备停止在移动的PLMN上搜索4G网络，也不会类似现有技术在移动的PLMN上搜索3G网络或2G网络，而是在联通、电信和广电中的至少一个运营商的PLMN上搜索4G网络，在电信的PLMN上搜索到4G网络后，发送注册请求，以将终端设备注册至电信的4G网络。
在上述提供的漫游场景下的网络注册方法，终端设备在第一漫游地运营商(例如，移动)的PLMN的高制式的第一网络(例如，4G网络)注册失败，且接收到用于指示在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络(例如，3G网络或2G网络)的注册拒绝消息的情况下，响应于注册拒绝消息，终端设备会在漫游地的除第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索第一网络，这样，在其他漫游地运营商的第二漫游地运营商(例如，电信)的PLMN上搜索到高制式的第一网络的情况下，终端设备发送注册请求以请求注册至高制式的第一网络，使得终端设备有更多的机会优先注册至高制式的第一网络，避免了现有技术中终端设备在第一漫游地运营商的PLMN上搜索低制式的第二网络且最终注册至低制式的第二网络导致用户体验差的问题，有效地提高了用户体验。
在一些实施例，在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络的情况下，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络 的第二网络。也就是说，在终端设备未注册成功的情况下，终端设备会在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络。
需要说明的是，这里的漫游地的至少一个漫游地运营商可以是漫游地的部分或全部运营商，不做任何限定。漫游地的至少一个漫游地运营商可以包括第一漫游地运营商，也可以不包括第一漫游地运营商，也不做任何限定。下文类似描述“在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络(或搜索低制式的第二网络)”中关于“漫游地的至少一个漫游地运营商”的解释同此处，后续不再赘述。
还需要说明的是，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索第二网络，表示的是终端设备能够在该至少一个漫游地运营商的PLMN上搜索第二网络，终端设备不一定遍历搜索完该至少一个漫游地运营商中的每个漫游地运营商。例如，该至少一个漫游地运营商包括3个漫游地运营商，搜网过程中，终端设备首先在其中一个漫游地运营商上搜索且成功注册到第二网络，那么，终端设备就没必要在其余2个漫游地运营商上继续搜索第二网络。下文关于类似描述的解释同此处，不再赘述。
关于终端设备在至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的过程，以下示例两种可能的实现方式。
方式1
在一些实施例中，运营商优先，针对一个漫游地运营商，按照网络制式由高到低的顺序，终端设备在一个漫游地运营商的PLMN上尝试搜索所有网络制式的第二网络，在搜索到任一网络制式的第二网络的情况下发起注册请求以请求注册网络，在注册成功的情况下不再搜索其他网络制式的网络，在未注册成功的情况下继续搜索其他网络制式的网络；在该一个漫游地运营商的PLMN上未搜索到所有网络制式的第二网络的情况下，在另一个漫游地运营商的PLMN上尝试搜索所有网络制式的第二网络，直到在任一个漫游地运营商的PLMN上搜索到任一个网络制式的第二网络。
假设，第一网络为4G网络，终端设备在移动的PLMN上注册失败且第一预设时长超时的情况下，终端设备可以在移动、联通、电信和广电的PLMN上搜索网络制式低于4G网络的3G网络或2G网络，这里，3G和2G可视为第二网络的两种网络制式。在搜索3G网络或2G网络的过程中，终端设备首先在移动的PLMN上搜索3G网络，若搜索到3G网络，则发起3G网络的注册请求以请求注册至3G网络，在注册成功的情况下不再搜索移动的2G网络，若未注册成功或者未搜索到移动的3G网络，终端设备继续在移动的PLMN上搜索2G网络；同理，若搜索到2G网络，则发起2G网络的注册请求以请求注册至2G网络，在注册成功的情况下不再搜索其他漫游地运营商的网络，若未注册成功或者未搜索到移动的2G网络，在另一个漫游地运营商(例如，联通)的PLMN上按照网络制式由高到低的顺序搜索3G网络或2G网络，直到在任一个漫游地运营商的PLMN上搜索到3G网络或2G网络。
方式2
在另一些实施例中，网络制式优先，针对一个网络制式，终端设备尝试在各个漫游地运营商的PLMN上搜索该网络制式下的第二网络，在任一个漫游地运营商的PLMN上搜索到该网络制式的第二网络的情况下发起注册请求以请求注册网络，在注册成功的情况下不再搜索其他漫游地运营商的该网络制式下的第二网络，在未注册成功的情况下继续搜索 其他漫游地运营商的该网络制式下的第二网络；在任一个漫游地运营商的PLMN上未搜索到该网络制式的第二网络的情况下，针对另一个网络制式，尝试在各个漫游地运营商的PLMN上搜索该另一个网络制式下的第二网络，直到在任一个漫游地运营商的PLMN上搜索到任一个网络制式的第二网络。
假设，第一网络为4G网络，终端设备在移动的PLMN上注册失败且第一预设时长超时的情况下，终端设备可以在移动、联通、电信和广电的PLMN上搜索网络制式低于4G网络的3G网络或2G网络，这里，3G和2G可视为第二网络的两种网络制式。在搜索3G网络或2G网络的过程中，优先搜索3G网络。终端设备在移动的PLMN上搜索3G网络，若搜索到3G网络，则发起3G网络的注册请求以请求注册至3G网络，在注册成功的情况下不再搜索联通、电信和广电的3G网络，若未注册成功或者未搜索到移动的3G网络，终端设备在联通、电信和广电的PLMN上搜索3G网络，直到在其中任一个漫游地运营商的PLMN上搜索到3G网络且注册成功，若未在任一个漫游地运营商的PLMN上搜索到3G网络，则开始在移动、联通、电信和广电的PLMN上搜索2G网络，直到在任一个漫游地运营商的PLMN上搜索到2G网络。
示例性地，在上述终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的步骤中，终端设备优先在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。可以理解，该至少一个漫游地运营商包括第一漫游地运营商。
在该实施例中，终端设备在搜索低制式的第二网络的过程中，终端设备优先在之前已经搜索到第一网络的第一漫游地运营商的PLMN上搜索第二网络，在第一漫游地运营商的PLMN上搜索到第二网络的情况下，终端设备发起注册请求以尝试注册至第二网络；在第一漫游地运营商的PLMN上未搜索到第二网络的情况下，终端设备可以在其他漫游地运营商的PLMN上继续搜索第二网络。这样，对于搜索低制式的第二网络的过程可以尽可能遵守现有协议，减少对协议的改动，达到简化了设计的目的。
终端设备优先在第一漫游地运营商的PLMN上搜索第二网络，在一示例中，对于上述方式1，可以理解为终端设备优先在第一漫游地运营商的PLMN上尝试搜索所有网络制式的第二网络；在另一示例中，对于上述方式2，可以理解为，在至少一个漫游地运营商的PLMN上搜索同一网络制式的第二网络时，终端设备优先在第一漫游地运营商的PLMN上尝试搜索该网络制式的第二网络。
在一些实施例中，在其他漫游地运营商的至少部分漫游地运营商的PLMN上未搜索到第一网络的情况下，在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
也就是说，在终端设备未搜索到第一网络的情况下，终端设备会在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络。
应理解，这里的至少部分漫游地运营商，表示的是其他漫游地运营商的部分或全部漫游地运营商。出于一些条件限制(例如下文方法600的时长限制)或网络等问题，终端设备并不一定能搜索完其他漫游地运营商，因此，终端设备有可能搜索一部分漫游地运营商后就去搜索低制式的第二网络。
关于终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一 网络的第二网络的具体描述可参考上文的相关描述，不再赘述。
在一些实施例中，注册拒绝消息还用于指示终端设备在第二预设时长内禁止使用第一漫游地运营商的PLMN的第一网络，以及，在上述步骤S430，即响应于注册拒绝消息，在其他漫游地运营商的PLMN上搜索第一网络的步骤中，终端设备响应于注册拒绝消息，在第二预设时长内禁止使用第一漫游地运营商的PLMN的第一网络，且在其他漫游地运营商的PLMN上搜索第一网络。
第二预设时长可以是任意时长，此处不做任何限定。示例性地，第二预设时长小于或等于15min。例如，第二预设时长可以是14min、13min、12min、10min、9min、8min、7min等。
由于第一漫游地运营商的PLMN的第一网络注册失败，为了避免短时间内终端设备可能多次尝试注册第一漫游地运营商的PLMN的第一网络且均未成功导致终端设备迟迟无法入网的问题，通过限定一个第二预设时长，在第二预设时长内禁止终端设备使用第一漫游地运营商的PLMN的第一网络，且在禁用第一漫游地运营商的PLMN的第一网络的期间内，优先在其他漫游地运营商的PLMN上搜索第一网络。
在上述实施例中，在第二预设时长超时后，终端设备解除第一漫游地运营商的PLMN的第一网络的禁用状态，这样，终端设备可以通过执行重选、或重定向等过程回到第一网络以重新尝试注册第一网络，若注册失败则继续执行步骤S430以及后续步骤，若注册成功则驻留在第一网络。这样，若终端设备最终并未成功注册到第一网络，解除第一漫游地运营商的PLMN的第一网络的禁用状态后，终端设备还有机会再次回到高制式的第一网络以尝试注册至第一网络，尽量提高用户体验。
在上述实施例中，可以设置定时器(定义为第二定时器)，通过定时器控制第二预设时长。
示例性地，终端设备响应于注册拒绝消息，开启第二定时器，在第二定时器的时长内禁止使用第一漫游地的PLMN的第一网络，第二定时器的时长为第二预设时长；终端设备在其他漫游地运营商的PLMN上搜索第一网络。以及，在第二定时器超时后，终端设备解除第一漫游地运营商的PLMN的第一网络的禁用状态。
需要说明的是，在第一漫游地运营商包括多个PLMN的情况下，在步骤S410中无论终端设备搜索到的是第一漫游地运营商的哪个PLMN上的第一网络，在接收到注册拒绝消息后，终端设备会禁止在第一漫游地运营商的所有PLMN上使用第一网络。
在一些实施例中，在上述步骤S430，即响应于注册拒绝消息，在其他漫游地运营商的PLMN上搜索第一网络的步骤中，终端设备响应于注册拒绝消息，在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络。
示例性地，第一预设时长小于或等于2min，例如，第一预设时长可以是2min、1.5min、1min、0.5min等。
在本申请实施例中，对于不同网络制式的第一网络，可以设置不同时长的第一预设时长，针对不同网络制式的第一网络的第一预设时长，具体不做任何限定，可以基于实际情况灵活设置。例如，针对5G网络，第一预设时长的时长为时长1，针对4G网络，第一预设时长为时长2，针对3G网络，第一预设时长为时长3，时长1、时长2和时长3均不同。
在一些实施例中，一般来说，网络制式越高的网络的频点更多一些，搜索这些网络需要的时间更长一些，因此，为了使得终端设备尽可能搜索到高制式的网络，第一网络的网络制式越高，第一预设时长的时长设置的更长一些。例如，针对5G网络的第一预设时长的时长大于针对4G网络的第一预设时长的时长。
在上述实施例中，通过设置第一预设时长，限定在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络，可以避免终端设备由于长时间持续搜索第一网络导致终端设备迟迟无法入网的问题，进一步提高了用户体验。
在上述实施例中，可以设置定时器(定义为第一定时器)，通过定时器控制第一预设时长。
示例性地，终端设备响应于注册拒绝消息，开启第一定时器，第一定时器的时长为第一预设时长；终端设备在第一定时器的时长内在其他漫游地运营商的PLMN上搜索第一网络。
结合上述用于限制第一漫游地运营商的PLMN的第一网络的第二预设时长，在一些实施例中，终端设备响应于注册拒绝消息，在第二预设时长内禁止使用第一漫游地运营商的PLMN的第一网络，且在第一预设时长内在所述其他漫游地运营商的PLMN上搜索第一网络，其中，第一预设时长小于第二预设时长。
也就是说，在禁止使用第一漫游地运营商的PLMN的第一网络的第二预设时长内，终端设备在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络。在第一预设时长超时后，无论终端设备处于各种状态(成功注册第一网络、或未成功注册第一网络、或并未搜索到第一网络等)，终端设备均停止在其他漫游地运营商的任一个漫游地运营商的PLMN上搜索第一网络，且由于第二预设时长还未超时，终端设备依然禁止使用第一漫游地运营商的PLMN的第一网络。
示例性地，第二预设时长为12min，第一预设时长小于或等于2min，例如，第一预设时长可以是2min、1.5min、1min、0.5min等。
结合上述定义的第一定时器和第二定时器，示例性地，终端设备响应于注册拒绝消息，开启第二定时器，在第二定时器的时长内禁止使用第一漫游地的PLMN的第一网络；开启第一定时器，在第一定时器的时长内在其他漫游地运营商的PLMN上搜索第一网络。第一定时器的时长为第一预设时长，第二定时器的时长为第二预设时长，第一预设时长小于第二预设时长。
应理解，终端设备开启第二定时器和开启第一定时器的步骤可以是同时进行的，也可以是先开启第二定时器再开启第一定时器，此处不做任何限定。
图6是本申请实施例提供的漫游场景下的网络注册方法600的示意性流程图。在方法600中，结合上述第一预设时长和第二预设时长，对终端设备搜索网络的各种情况做详细描述。
在步骤S611中，终端设备在第一漫游地的PLMN上搜索到第一网络。
在步骤S612中，在第一漫游地运营商的PLMN上搜索到第一网络的情况下，向接入网设备1发送注册请求#1，注册请求#1用于请求注册至第一漫游地运营商的PLMN的第一网络。
这里的注册请求#1可对应上文的第一注册请求。
在步骤S613中，响应于注册请求#1，接入网设备1发送注册拒绝消息#1，终端设备接收注册拒绝消息#1。
注册拒绝消息#1用于指示终端设备未成功注册至第一漫游地运营商的PLMN的第一网络，且用于指示终端设备在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。示例性地，注册拒绝消息#1包括原因值#111、原因值#16或原因值#17。
在步骤S614中，响应于注册拒绝消息#1，终端设备在第二预设时长内禁止使用第一漫游地运营商的PLMN的第一网络，且在第一预设时长内在其他漫游地运营商的PLMN上搜索第一网络。
在步骤S615中，终端设备确定在第一预设时长内是否搜索到第一网络。
或者说，终端设备确定在第一预设时超时前是否搜索到4G网络
在第一预设时长内搜索到第一网络的情况下，终端设备执行步骤S620。
在第一预设时长内未搜索到第一网络的情况下，可以分为两种情况，终端设备可以选择这两种情况中的一种情况来执行，在第一种情况下终端设备执行步骤S641，或在第二种情况下终端设备执行步骤S642，目的是在未搜索到第一网络的情况下搜索网络制式低于第一网络的第二网络。
在步骤S620中，终端设备在其他漫游地运营商的第二漫游地运营的PLMN上搜索到第一网络的情况下，向接入网设备2发送注册请求#2，注册请求#2用于请求注册至第二漫游地运营商的PLMN的第一网络。
这里的注册请求#2可对应上文的第二注册请求。
应理解，接入网设备1和接入网设备2可以是同一个设备，也可以是不同设备，主要在于第一漫游地运营商和第二漫游地运营商是否共享同一个接入网设备。在第一漫游地运营商和第二漫游地运营商共享同一个接入网设备的情况下，接入网设备1和接入网设备2可以是同一个设备，终端设备将注册请求#1和注册请求#2会发送至同一个接入网设备；在第一漫游地运营商和第二漫游地运营商不共享同一个接入网设备的情况下，不同的接入网设备支持各自的漫游地运营商，接入网设备1和接入网设备2是不同的设备，终端设备分别将注册请求#1和注册请求#2发送至第一漫游地运营商和第二漫游地运营商各自支持的接入网设备1和接入网设备2。
在步骤S621中，终端设备确定是否注册成功。
在该步骤中，终端设备确定终端设备是否成功注册至第二漫游地运营商的PLMN的第一网络。
在终端设备注册成功的情况下，终端设备通过第二漫游地运营商的第一网络进行通信，直到第二预设时长超时，执行步骤S660。
在终端设备未注册成功的情况下，执行步骤S623以及步骤S631或步骤S632，目的在于确定第一预设时长是否超时，以及，在超时或者未超时执行不同的步骤。
终端设备根据接入网设备反馈的消息，确定终端设备是否注册成功。终端设备接收到针对注册请求#2的注册拒绝消息#2，意味着未注册成功；终端设备接收到针对注册请求#2d的注册成功消息，意味着注册成功。
在步骤S623中，在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络的情况下，终端设备确定第一预设时长是否超时。
在第一预设时长超时的情况下，终端设备执行步骤S632；在第一预设时长未超时的情况下，终端设备执行步骤S631。
在步骤S631中，在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络且第一预设时长未超时的情况下，终端设备在第一预设时长内在其他漫游地运营商中除第二漫游地运营商以外的漫游地运营商的PLMN上继续搜索第一网络。
在该步骤中，在搜索第一网络的过程中，重复执行步骤S615以及后续相关步骤，以尝试注册至高制式的第一网络或低制式的第二网络。
具体地，在第一预设时长内，终端设备在其他漫游地运营商中除第二漫游地运营商以外的漫游地运营商中的例如第三漫游地运营商的PLMN上搜索到第一网络的情况下，发起新的注册请求，在注册成功的情况下采用第三漫游地运营商的PLMN的第一网络进行通信；在第三漫游地运营商的PLMN的第一网络未注册成功以及在第一预设时长未超时的情况下，继续在其他漫游地运营中除第二漫游地运营商和第三漫游地运营商以外的漫游地运营商的PLMN上搜索第一网络，直到在第一预设时长内搜索到第一网络或者在第一预设时长超时后搜索低制式的第二网络。
当然，若其他漫游地运营商中只有第一漫游地运营商而无其他漫游地运营商的情况下，跳过该步骤，终端设备直接搜索低制式的第二网络。
在上述实施例中，在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络且第一预设时长未超时的情况下，终端设备在第一预设时长内在其他漫游地运营商中除第二漫游地运营商以外的漫游地运营商的PLMN上继续搜索第一网络，能够提高终端设备搜索到第一网络的机会，以提高注册至第一网络的机会，提高用户体验。
在步骤S632中，在终端设备未成功注册至第二漫游地运营商的PLMN的第一网络且第一预设时长超时的情况下，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
也就是说，在第一预设时长超时的情况下终端设备也并未成功注册至第二漫游地运营商的PLMN的第一网络的情况下，为了使得终端设备尽快入网，终端设备不再搜索第一网络，而是在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络，以注册至第二网络。在搜索到低制式的第二网络的情况下执行步骤S650，以注册至低制式的第二网络。可以理解，这种情况下，意味着终端设备搜索到第二漫游地运营商的第一网络花费了一定时长，终端设备在第二漫游地运营商以外的漫游地运营商的PLMN上大概率未搜索到第一网络，因此，第一预设时长超时后搜索低制式的第二网络，能提高终端设备尽快入网的概率。
在一些实施例中，在上述终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的步骤中，终端设备优先在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
关于终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的具体描述可参考上文的相关描述，不再赘述。
在步骤S641中，在第一预设时长未超时且在其他漫游地运营商中任一个漫游地运营商的PLMN上均未搜索到第一网络的情况下，在第一预设时长超时之前，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
也就是说，终端设备在第一预设时长超时之前已经遍历了其他漫游地运营商中的所有漫游地运营商，遍历结果是在任一个漫游地运营商的PLMN上均未搜索到第一网络，此种情况下，终端设备不需要等待第一预设时长结束后再去搜索低制式的第二网络，而是提前结束搜索时长(即第一预设时长)，在第一预设时长超时之前，终端设备提前在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络。这样，在已经确知其他漫游地运营商的PLMN均未搜索到第一网络的情况下，提前结束搜索时长以能够提前在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络，减少了不必要的搜索时长，以便于终端设备尽快搜索其他网络以尽早接入网络，提高用户体验。
应理解，“第一预设时长未超时”表示的是未超过第一预设时长的结束时间，以及，“在第一预设时长超时之前”表示的是在超过第一预设时长的结束时间之前的时间。
在一些实施例中，在上述终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的步骤中，终端设备优先在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
关于终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的具体描述可参考上文的相关描述，不再赘述。
结合上文定义的针对第一预设时长的第一定时器，实现中，终端设备开启第一定时器，在第一定时器的时长内在其他漫游地运营商的PLMN上搜索第一网络；在第一定时器未超时且在其他漫游地运营商中任一个漫游地运营商的PLMN上均未搜索到第一网络的情况下，终端设备提前关闭第一定时器；在关闭第一定时器后，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
应理解，这里描述的提前关闭第一定时器，表示的是在第一定时器超时前关闭定时器，这样，终端设备在关闭第一定时器后，就可以在第一预设时长超时前，提前搜索低制式的第二网络。
在步骤S642中，在第一预设时长超时且在其他漫游地运营商的PLMN上还未搜索到第一网络的情况下，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
在该步骤中，在第一预设时长超时的情况下，终端设备在其他漫游地运营商的PLMN上还未搜索到第一网络，但第一预设时长已经超时，此种情况下，终端设备不再搜索第一网络，而是在漫游地的至少一个漫游地运营商的PLMN上搜索低制式的第二网络。
在一些实施例中，在上述终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的步骤中，终端设备优先在第一漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络。
关于终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于第一网络的第二网络的具体描述可参考上文的相关描述，不再赘述。
在步骤S650中，终端设备在任一个漫游地运营商的PLMN上搜索到网络制式低于第一网络的第二网络的情况下，发送注册请求#3，以请求将终端设备注册至该漫游地运营商的PLMN的第二网络。
应理解，这里的任一个漫游地运营商是上述的至少一个漫游地运营商中的任一个漫游地运营商。在终端设备优先在第一漫游地运营商的PLMN上搜索第二网络的实施例中，若 终端设备在第一漫游地运营商的PLMN上搜索到第二网络，则该任一个漫游地运营商为第一漫游地运营商。
在步骤S660中，在第二预设时长超时的情况下，终端设备解除第一漫游地运营商的PLMN的第一网络的禁用状态。
这样，解除第一漫游地运营商的PLMN的第一网络的禁用状态后，终端设备可以通过执行重选、或重定向等过程回到第一网络以重新搜索以及尝试注册第一网络，若注册失败则继续搜索第一网络或搜索第二网络以尽量将终端设备接入网络，若注册成功则驻留在第一网络。这样，若终端设备最终并未成功注册到第一网络，解除第一漫游地运营商的PLMN的第一网络的禁用状态后，终端设备还有机会再次回到高制式的第一网络以尝试注册至第一网络，尽量提高用户体验。
图7是本申请实施例提供的漫游场景下的网络注册方法700的示意性流程图。
在方法700中，以第一网络为4G网络以及第二网络为3G网络或2G网络为例，以及，以漫游地运营商#1为第一漫游地运营商的一例、漫游地运营商#2为第二漫游地运营商的一例、定时器#1为第一定时器的一例、定时器#2为第二定时器的一例作为示例，示意一个具体实施例，结合上文描述，对于方法700中类似或相同内容做简单描述，不再赘述。
在方法700中，在一种漫游场景下，终端设备位于漫游地，开机搜网，在漫游地的漫游地运营商的PLMN上搜索网络。
在步骤S711中，终端设备在漫游地运营商#1的PLMN上搜索到4G网络。
在步骤S712中，在漫游地运营商#1的PLMN上搜索到4G网络的情况下，向接入网设备1发送注册请求#1，注册请求#1用于请求注册至漫游地运营商#1的PLMN的4G网络。
在步骤S713中，响应于注册请求#1，接入网设备1发送注册拒绝消息#1，终端设备接收注册拒绝消息#1。
在步骤S714中，终端设备开启定时器#2，在定时器#2的时长内禁止使用漫游地运营商#2的PLMN的4G网络。定时器#2的时长为第二预设时长。
在步骤S715中，终端设备开启定时器#1。定时器#1的时长为第一预设时长，第一预设时长小于第二预设时长。
在上述步骤中，步骤S714和步骤S715顺序不做任何限定，步骤S714和步骤S715可以同时执行，即，终端设备可以同时开启定时器#2和定时器#1；或者，步骤S714可以在步骤S715之前执行，即，终端设备先开启定时器#2，在开启定时器#1。
在步骤S716中，终端设备在定时器#1的时长内在其他漫游地运营商的PLMN上搜索4G网络。
在步骤S717中，终端设备确定在定时器#1的时长内是否搜索到4G网络。
或者说，终端设备确定在定时器#1超时前是否搜索到4G网络。
在定时器#1的时长内搜索到4G网络的情况下，终端设备执行步骤S720；在定时器#1的时长内未搜索到4G网络的情况下，终端设备执行步骤S741或步骤S742，目的是在未搜索到4G网络的情况下搜索网络制式低于4G网络的3G网络或2G网络。
在步骤S720中，终端设备在其他漫游地运营商的漫游地运营商#2的PLMN上搜索到4G网络的情况下，向接入网设备2发送注册请求#2，注册请求#2用于请求注册至漫游地运营商#2的PLMN的4G网络。
在步骤S721中，终端设备确定是否注册成功。
应理解，终端设备确定是否注册成功，确定的是终端设备是否成功注册至漫游地运营商#2的PLMN的4G网络。
在终端设备注册成功的情况下，终端设备通过漫游地运营商#2的4G网络进行通信，直到定时器#2超时，执行步骤S760。
在终端设备未注册成功的情况下，执行步骤S723以及步骤S731或步骤S732，目的在于确定定时器#1是否超时，以及，在超时或者未超时执行不同的步骤。
终端设备根据接入网设备反馈的消息，确定终端设备是否注册成功。终端设备接收到注册拒绝消息#2，意味着未注册成功；终端设备接收到注册成功消息，意味着注册成功。
在步骤S723中，终端设备确定定时器#1是否超时。
在定时器#1超时的情况下，终端设备执行步骤S732；在定时器#1未超时的情况下，终端设备执行步骤S731。
在步骤S731中，在终端设备未成功注册至漫游地运营商#2的PLMN的4G网络且定时器#1未超时的情况下，终端设备在定时器#1的时长内在其他漫游地运营商中除漫游地运营商#2以外的漫游地运营商的PLMN上继续搜索4G网络。
在搜索4G网络的过程中，重复执行步骤S717以及后续相关步骤，最终尝试注册至高制式的4G网络，或尝试注册至低制式的3G网络或2G网络。关于该步骤的具体描述可参考方法600中关于步骤S631的相关描述，不再赘述。
在步骤S732中，在终端设备未成功注册至漫游地运营商#2的PLMN的4G网络且定时器#1超时的情况下，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索3G网络或2G网络。
关于该步骤的具体描述可参考方法600中关于步骤S632的相关描述，不再赘述。
在步骤S741中，在定时器#1未超时且在其他漫游地运营商中任一个漫游地运营商的PLMN上均未搜索到4G网络的情况下，提前关闭定时器#1；在关闭定时器#1后，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索3G网络或2G网络。
应理解，这里描述的提前关闭定时器#1，表示的是在定时器#1超时前关闭定时器，这样，终端设备在关闭定时器#1后，就可以在第一预设时长超时前，提前搜索3G网络或2G网络。
关于该步骤的具体描述可参考方法600中关于步骤S641的相关描述，不再赘述。
在步骤S742中，在定时器#1超时且在其他漫游地运营商的PLMN上还未搜索到4G网络的情况下，终端设备在漫游地的至少一个漫游地运营商的PLMN上搜索3G网络或2G网络。
关于该步骤的具体描述可参考方法600中关于步骤S642的相关描述，不再赘述。
在步骤S750中，终端设备在任一个漫游地运营商的PLMN上搜索到3G网络或2G网络的情况下，发送注册请求#3，以请求将终端设备注册至该漫游地运营商的PLMN的3G网络或2G网络。
应理解，这里的任一个漫游地运营商是上述的至少一个漫游地运营商中的任一个漫游地运营商。在终端设备优先在漫游地运营商#1的PLMN上搜索低制式的网络的实施例中，若终端设备在漫游地运营商#1的PLMN上搜索到3G网络或2G网络，则该任一个漫游地运营商为漫游地运营商#1。
在步骤S760中，在定时器#2超时的情况下，终端设备解除漫游地运营商#1的PLMN的4G网络的禁用状态。
需要再次说明的是，上述各方法实施例中步骤的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
以上，结合图1至图7，详细说明了本申请实施例提供的漫游场景下的网络注册方法，下面将结合图8至图9，详细描述根据本申请实施例提供的终端设备。
图8是本申请实施例提供的终端设备800的示例性框图。该终端设备800包括处理单元810和收发单元820。
收发单元820用于：在漫游地的第一漫游地运营商的公共陆地移动网络PLMN上搜索到第一网络的情况下，发送第一注册请求，所述第一注册请求用于请求将终端设备注册至所述第一漫游地运营商的PLMN的第一网络；
收发单元820还用于：接收响应于所述第一注册请求的注册拒绝消息，所述注册拒绝消息用于指示所述终端设备未成功注册至所述第一漫游地运营商的PLMN的所述第一网络，且用于指示所述终端设备在所述第一漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络；
处理单元810用于：响应于所述注册拒绝消息，在所述漫游地的除所述第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索所述第一网络；
收发单元820还用于，在所述其他漫游地运营商中的第二漫游地运营商的PLMN上搜索到所述第一网络的情况下，发送第二注册请求，以将所述终端设备注册至所述第二漫游地运营商的PLMN的所述第一网络。
可选地，处理单元810具体用于：响应于所述注册拒绝消息，在第一预设时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络。
可选地，处理单元810还用于：在所述终端设备未成功注册至所述第二漫游地运营商的PLMN的所述第一网络且所述第一预设时长未超时的情况下，在所述第一预设时长内在所述其他漫游地运营商中除所述第二漫游地运营商以外的漫游地运营商的PLMN上继续搜索所述第一网络。
可选地，处理单元810还用于：在所述终端设备未成功注册至所述第二漫游地运营商的PLMN的所述第一网络且所述第一预设时长超时的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
可选地，处理单元810还用于：在所述第一预设时长未超时且在所述其他漫游地运营商中任一个漫游地运营商的PLMN上均未搜索到所述第一网络的情况下，在所述第一预设 时长超时之前，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
可选地，处理单元810还用于：在所述第一预设时长超时且在所述其他漫游地运营商的PLMN上还未搜索到所述第一网络的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
可选地，处理单元810还用于：在所述其他漫游地运营商的至少部分漫游地运营商的PLMN上未搜索到所述第一网络的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
可选地，处理单元810还用于：在所述终端设备未成功注册至所述第二漫游地运营商的PLMN的所述第一网络的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
可选地，处理单元810具体用于：优先在所述第一漫游地运营商的PLMN上搜索网络制式低于所述第一网络的所述第二网络。
可选地，处理单元810具体用于：响应于所述注册拒绝消息，在第二预设时长内禁止使用所述第一漫游地运营商的PLMN的所述第一网络，且在所述第一预设时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络，所述第一预设时长小于所述第二预设时长。
可选地，处理单元810具体用于：响应于所述注册拒绝消息，开启定时器，所述定时器的时长为所述第一预设时长；
在所述定时器的时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络。
可选地，所述注册拒绝消息包括以下任一个原因值：原因值#111、原因值#16、原因值#17。
可选地，所述第一网络为5G网络或4G网络。
应理解，处理单元810可用于执行方法400、600和700中终端设备执行的各个步骤，具体描述可参考上文的相关描述，不再赘述。
应理解，这里的终端设备800以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。
在本申请的实施例，图8中的终端设备也可以是芯片或者芯片系统，例如：片上系统(system on chip，SoC)。
图9本申请实施例提供的终端设备900的示意性结构图。终端设备900用于执行上述方法实施例中对应的各个步骤和/或流程。
终端设备900包括处理器910、收发器920和存储器930。其中，终端设备900可对应上文图2示意的终端设备110，这里的处理器910可对应终端设备110的处理器111，这里的收发器920集成有终端设备110的天线1的功能。
其中，处理器910、收发器920和存储器930通过内部连接通路互相通信，处理器910可以实现终端设备900中各种可能的实现方式中处理器910的功能。存储器930用于存储指令，处理器910用于执行存储器930存储的指令，或者说，处理器910可以调用这些存储指令实现终端设备900中处理器910的功能。
可选地，该存储器930可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。该处理器910可以用于执行存储器中存储的指令，并且当该处理器910执行存储器中存储的指令时，该处理器910用于执行上述与终端设备对应的方法实施例的各个步骤和/或流程。
收发器920用于：在漫游地的第一漫游地运营商的公共陆地移动网络PLMN上搜索到第一网络的情况下，发送第一注册请求，所述第一注册请求用于请求将终端设备注册至所述第一漫游地运营商的PLMN的第一网络；
收发器920还用于：接收响应于所述第一注册请求的注册拒绝消息，所述注册拒绝消息用于指示所述终端设备未成功注册至所述第一漫游地运营商的PLMN的所述第一网络，且用于指示所述终端设备在所述第一漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络；
处理器910用于：响应于所述注册拒绝消息，在所述漫游地的除所述第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索所述第一网络；
收发器920还用于，在所述其他漫游地运营商中的第二漫游地运营商的PLMN上搜索到所述第一网络的情况下，发送第二注册请求，以将所述终端设备注册至所述第二漫游地运营商的PLMN的所述第一网络。
应理解，各个器件执行上述各个方法中相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，此处不再赘述。
应理解，在本申请实施例中，上述装置的处理器可以是中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(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。
在实现过程中，上述方法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的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件单元组合执行完成。软件单元可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器执行存储器中的指令，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
本申请实施例提供一种计算机程序产品，当所述计算机程序产品在终端设备运行时，使得终端设备执行上述实施例中的技术方案。其实现原理和技术效果与上述方法相关实施例类似，此处不再赘述。
本申请实施例提供一种可读存储介质，所述可读存储介质包含指令，当所述指令在终端设备运行时，使得所述终端设备执行上述实施例的技术方案。其实现原理和技术效果类似，此处不再赘述。
本申请实施例提供一种芯片，所述芯片用于执行指令，当所述芯片运行时，执行上述实施例中的技术方案。其实现原理和技术效果类似，此处不再赘述。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实 现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
应理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
还应理解，在本申请中，“当…时”、“若”以及“如果”均指在某种客观情况下UE或者基站会做出相应的处理，并非是限定时间，且也不要求UE或基站实现时一定要有判断的动作，也不意味着存在其它限定。
本领域普通技术人员可以理解：本申请中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围，也表示先后顺序。
本申请中对于使用单数表示的元素旨在用于表示“一个或多个”，而并非表示“一个且仅一个”，除非有特别说明。本申请中，在没有特别说明的情况下，“至少一个”旨在用于表示“一个或者多个”，“多个”旨在用于表示“两个或两个以上”。
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A可以是单数或者复数，B可以是单数或者复数。
本文中术语“……中的至少一个”或“……中的至少一种”，表示所列出的各项的全部或任意组合，例如，“A、B和C中的至少一种”，可以表示：单独存在A，单独存在B，单独存在C，同时存在A和B，同时存在B和C，同时存在A、B和C这六种情况，其中A可以是单数或者复数，B可以是单数或者复数，C可以是单数或者复数。
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、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
本申请中各个实施例之间相同或相似的部分可以互相参考。在本申请中各个实施例、以及各实施例中的各个实施方式/实施方法/实现方法中，如果没有特殊说明以及逻辑冲突，不同的实施例之间、以及各实施例中的各个实施方式/实施方法/实现方法之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例、以及各实施例中的各个实施方式/实施方法/实现方法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、实施方式、实施方法、或实现方法。以上所述的本申请实施方式并不构成对本申请保护范围的限定。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准总之，以上所述仅为本申请技术方案的较佳实施例而已，并非用于限定本申请的保护范围。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (16)

  1. 一种漫游场景下的网络注册方法，应用于终端设备中，其特征在于，包括：
    在漫游地的第一漫游地运营商的公共陆地移动网络PLMN上搜索到第一网络的情况下，发送第一注册请求，所述第一注册请求用于请求将终端设备注册至所述第一漫游地运营商的PLMN的所述第一网络；
    接收响应于所述第一注册请求的注册拒绝消息，所述注册拒绝消息用于指示所述终端设备未成功注册至所述第一漫游地运营商的PLMN的所述第一网络，且用于指示所述终端设备在所述第一漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络；
    响应于所述注册拒绝消息，在所述漫游地的除所述第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索所述第一网络；
    在所述其他漫游地运营商中的第二漫游地运营商的PLMN上搜索到所述第一网络的情况下，发送第二注册请求，以将所述终端设备注册至所述第二漫游地运营商的PLMN的所述第一网络。
  2. 根据权利要求1所述的网络注册方法，其特征在于，所述响应于所述注册拒绝消息，在所述漫游地的除所述第一漫游地运营商以外的其他漫游地运营商的PLMN上搜索所述第一网络，包括：
    响应于所述注册拒绝消息，在第一预设时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络。
  3. 根据权利要求2所述的网络注册方法，其特征在于，所述方法还包括：
    在所述终端设备未成功注册至所述第二漫游地运营商的PLMN的所述第一网络且所述第一预设时长未超时的情况下，在所述第一预设时长内在所述其他漫游地运营商中除所述第二漫游地运营商以外的漫游地运营商的PLMN上继续搜索所述第一网络。
  4. 根据权利要求2或3所述的网络注册方法，其特征在于，所述方法还包括：
    在所述终端设备未成功注册至所述第二漫游地运营商的PLMN的所述第一网络且所述第一预设时长超时的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
  5. 根据权利要求2至4中任一项所述的网络注册方法，其特征在于，所述方法还包括：
    在所述第一预设时长未超时且在所述其他漫游地运营商中任一个漫游地运营商的PLMN上均未搜索到所述第一网络的情况下，在所述第一预设时长超时之前，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
  6. 根据权利要求2至5中任一项所述的网络注册方法，其特征在于，所述方法还包括：
    在所述第一预设时长超时且在所述其他漫游地运营商的PLMN上还未搜索到所述第一网络的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
  7. 根据权利要求1至6中任一项所述的网络注册方法，其特征在于，所述方法还包括：
    在所述其他漫游地运营商的至少部分漫游地运营商的PLMN上未搜索到所述第一网络的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
  8. 根据权利要求1至7中任一项所述的网络注册方法，其特征在于，所述方法还包括：
    在所述终端设备未成功注册至所述第二漫游地运营商的PLMN的所述第一网络的情况下，在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络。
  9. 根据权利要求4至8中任一项所述的网络注册方法，其特征在于，所述在所述漫游地的至少一个漫游地运营商的PLMN上搜索网络制式低于所述第一网络的第二网络，包括：
    优先在所述第一漫游地运营商的PLMN上搜索网络制式低于所述第一网络的所述第二网络。
  10. 根据权利要求2至6中任一项所述的网络注册方法，其特征在于，所述响应于所述注册拒绝消息，在第一预设时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络，包括：
    响应于所述注册拒绝消息，在第二预设时长内禁止使用所述第一漫游地运营商的PLMN的所述第一网络，且在所述第一预设时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络，所述第一预设时长小于所述第二预设时长。
  11. 根据权利要求2至10中任一项所述的网络注册方法，其特征在于，所述响应于所述注册拒绝消息，在第一预设时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络，包括：
    响应于所述注册拒绝消息，开启定时器，所述定时器的时长为所述第一预设时长；
    在所述定时器的时长内在所述其他漫游地运营商的PLMN上搜索所述第一网络。
  12. 根据权利要求1至11中任一项所述的网络注册方法，其特征在于，所述注册拒绝消息包括以下任一个原因值：原因值#111、原因值#16、原因值#17。
  13. 根据权利要求1至12中任一项所述的网络注册方法，其特征在于，所述第一网络为5G网络或4G网络。
  14. 一种终端设备，其特征在于，包括：
    存储器，用于存储计算机指令；
    处理器，用于调用所述存储器中存储的计算机指令，以执行如权利要求1至13中任一项所述的方法。
  15. 一种计算机可读存储介质，其特征在于，用于存储计算机指令，所述计算机指令用于实现如权利要求1至13中任一项所述的方法。
  16. 一种芯片，其特征在于，所述芯片包括：
    存储器：用于存储指令；
    处理器，用于从所述存储器中调用并运行所述指令，使得安装有所述芯片系统的通信设备执行如权利要求1至13中任一项所述的方法。
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CN106465219A (zh) * 2014-03-20 2017-02-22 华为终端有限公司 一种注册网络的方法及装置
US20180262960A1 (en) * 2017-03-08 2018-09-13 Qualcomm Incorporated Roaming out-of-service (oos) recovery for long term evolution (lte)-only networks
CN111314949A (zh) * 2020-02-18 2020-06-19 闻泰通讯股份有限公司 网络接入方法、装置、电子设备和存储介质
CN111683360A (zh) * 2020-06-02 2020-09-18 北京字节跳动网络技术有限公司 移动通信方法、装置和电子设备

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CN106465219A (zh) * 2014-03-20 2017-02-22 华为终端有限公司 一种注册网络的方法及装置
US20180262960A1 (en) * 2017-03-08 2018-09-13 Qualcomm Incorporated Roaming out-of-service (oos) recovery for long term evolution (lte)-only networks
CN111314949A (zh) * 2020-02-18 2020-06-19 闻泰通讯股份有限公司 网络接入方法、装置、电子设备和存储介质
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