WO2023207724A1 - 一种通信方法及通信装置 - Google Patents

一种通信方法及通信装置 Download PDF

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Publication number
WO2023207724A1
WO2023207724A1 PCT/CN2023/089306 CN2023089306W WO2023207724A1 WO 2023207724 A1 WO2023207724 A1 WO 2023207724A1 CN 2023089306 W CN2023089306 W CN 2023089306W WO 2023207724 A1 WO2023207724 A1 WO 2023207724A1
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WO
WIPO (PCT)
Prior art keywords
plmn
access network
terminal device
network device
access
Prior art date
Application number
PCT/CN2023/089306
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English (en)
French (fr)
Inventor
屈琴
Original Assignee
华为技术有限公司
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Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023207724A1 publication Critical patent/WO2023207724A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/14—Mobility data transfer between corresponding nodes

Definitions

  • the embodiments of the present application relate to the field of communication, and more specifically, to a communication method and a communication device.
  • the same operator may deploy multiple public land mobile networks (public land mobile network, PLMN).
  • Terminal equipment of different categories belonging to the operator can be registered to the corresponding PLMN according to certain principles (for example, the terminal equipment is given priority to register to the PLMN contracted by the terminal equipment), and the PLMN to which the terminal equipment is given priority is considered to be the higher priority of the terminal equipment.
  • Priority network other PLMNs that are different from the PLMN to which the terminal device is registered first (such as visited PLMN (VPLMN)) are low-priority networks for the terminal device. When the terminal device is outside the coverage of the high-priority network, the terminal device can access or camp on the low-priority network.
  • VPN visited PLMN
  • the terminal device When a terminal device accesses or resides on a low-priority network, the terminal device will periodically scan signals so that when the terminal device moves back into the coverage of a high-priority network, it can quickly access the high-priority network. However, periodic scanning of signals by the terminal equipment will increase the power consumption of the terminal equipment.
  • Embodiments of the present application provide a communication method in order to optimize the process of a terminal device returning from a low-priority network to a high-priority network.
  • a communication method is provided.
  • the method can be executed by the access management network element, or can also be executed by the component (such as a chip or circuit) of the access management network element.
  • the component such as a chip or circuit
  • the following description takes the execution by the access management network element as an example.
  • the method includes: the access management network element determines that the terminal equipment is within the coverage of the first public land mobile network (PLMN) contracted by the terminal equipment, and the second PLMN accessed by the terminal equipment is consistent with the third PLMN.
  • PLMN public land mobile network
  • a PLMN is different; the access management network element sends network change information to the first access network device, and the network change information is used to instruct the first access network device to trigger the terminal device to change to the first PLMN.
  • the access management network element determines that the terminal device is within the coverage of the first PLMN, and the second PLMN accessed by the terminal device is different from the first PLMN, then the access management network element provides the first access network device with Send network change information to instruct the first access network device to trigger the terminal device to change to the first PLMN.
  • the terminal device does not need to periodically scan the signal, and can also move from the first access network device to the coverage area of the first PLMN.
  • the second PLMN is changed to the first PLMN, so the power consumption of the terminal device can be saved.
  • the first PLMN contracted by the terminal device is a high-priority network of the terminal device
  • the second PLMN that is different from the first PLMN is a low-priority network of the terminal device.
  • the second PLMN is a visited PLMN (VPLMN).
  • the network change information includes an identity of the first PLMN and/or an identity of a second access network device, and the second access network device belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located.
  • the first access network device to trigger the terminal device to redirect to the first PLMN or switch to the first PLMN according to the identity of the first PLMN and/or the identity of the second access network device.
  • the change is redirection
  • the network change information also includes redirection indication information.
  • the redirection indication information is used to instruct the first access network device to trigger the terminal device to redirect to the first PLMN, or to instruct the first access network device to redirect to the second access network device in the first PLMN.
  • the first access network device may determine to trigger the terminal device to redirect to the first PLMN according to the redirection indication information.
  • the change is a handover
  • the network change information further includes handover indication information.
  • the switching instruction information is used to instruct the first access network device to trigger the terminal device to switch to the first PLMN, or to instruct the first access network device to switch to the second access network device in the first PLMN.
  • the first access network device may determine to trigger the terminal device to switch to the first PLMN according to the handover instruction information.
  • the network change information includes an index of a radio access technology (radio access technology, RAT)/frequency selection priority (RAT frequency selection priority, RFSP) policy
  • RAT radio access technology
  • RFSP frequency selection priority
  • the RFSP policy is used to indicate that the frequency point corresponding to the second access network device has the highest priority, the second access network device belongs to the first PLMN, and the second access network device covers the area where the terminal device is located.
  • the first access network device to send frequency priority information to the terminal device according to the RFSP policy, thereby triggering the terminal device to change to the first PLMN according to the frequency priority information.
  • the network change information also includes the RFSP policy.
  • the method further includes: the access management network element receiving the subscription information of the terminal device from the data management network element or the policy control network element; the access management network element The network element determines the first PLMN subscribed to by the terminal device based on the subscription information.
  • the access management network element can determine the first PLMN based on the subscription information obtained from the data management network element or the policy control network element. Even if the home operator of the terminal device modifies the first PLMN contracted by the terminal device, the access management network element can The management network element may also determine the updated first PLMN based on the subscription information of the terminal device, thereby ensuring that when the terminal device moves within the coverage of the updated first PLMN, it can still change to the updated first PLMN.
  • the access management network element sends network change information to the first access network device, including: when the preset conditions are met, the access management network element sends network change information to the first access network device.
  • the first access network device sends the network change information
  • the preset conditions include: the terminal device's residence time in the second PLMN exceeds the first preset value, and/or the terminal device is in the second PLMN. The number of accesses exceeds the second preset value.
  • the access management network element can also send network change information to the first access network device when the preset conditions are met, thereby avoiding the terminal device from sending ping-pong handover and reselection.
  • a communication method is provided.
  • the method can be executed by the first access network device, or can also be executed by a component (such as a chip or circuit) of the first access network device.
  • This method is not limited.
  • the following description takes the execution by the first access network device as an example.
  • the method includes: the first access network device receives network change information from the access management network element, the network change information is used to instruct the first access network device to trigger a change of the terminal device to the first PLMN, and the first PLMN is the PLMN signed by the terminal equipment, and the second PLMN to which the first access network equipment belongs is different from the first PLMN; the first access network equipment triggers the terminal equipment to change to the first PLMN.
  • the first access network device can trigger the terminal device to change to the first PLMN according to the network change information from the access management network element.
  • the terminal device does not need to scan the signal periodically, and can also change the signal from the second PLMN after moving into the coverage of the first PLMN. Change to the first PLMN, so the power consumption of the terminal device can be saved.
  • the network change information includes an identifier of the first PLMN and/or an identifier of a second access network device, and the second access network device belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located, the first access network equipment triggers the terminal equipment to change to the first PLMN, including: the first access network equipment sends a message to the terminal equipment Redirection information, the redirection information includes the identification of the second access network device, and the redirection information is used to instruct the terminal device to redirect to the second access network device.
  • the first access network device to trigger the terminal device to redirect to the first PLMN according to the identity of the first PLMN and/or the identity of the second access network device.
  • the network change information also includes redirection instruction information
  • the first access network device sends redirection information to the terminal device, including: the first access network device
  • the network device sends the redirection information to the terminal device according to the redirection instruction information.
  • the redirection indication information is used to instruct the first access network device to trigger the terminal device to redirect to the first PLMN, or to instruct the first access network device to redirect to the second access network device in the first PLMN.
  • the first access network device may determine to trigger the terminal device to redirect to the first PLMN according to the redirection indication information.
  • the network change information includes an identifier of the first PLMN and/or an identifier of a second access network device, and the second access network device belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located, the first access network equipment triggers the terminal equipment to change to the first PLMN, including: the first access network equipment initiates the change of the terminal equipment to the first PLMN. Handover process to the second access network device.
  • the first access network device to trigger the terminal device to switch to the first PLMN according to the identity of the first PLMN and/or the identity of the second access network device.
  • the network change information also includes switching instruction information
  • the first access network device initiates a switching process of switching the terminal device to the second access network device. , including: the first access network device initiating the handover process according to the handover instruction information.
  • the switching instruction information is used to instruct the first access network device to trigger the terminal device to switch to the first PLMN, or to instruct the first access network device to switch to the second access network device in the first PLMN.
  • the first access network device may determine to trigger the terminal device to switch to the first PLMN according to the handover instruction information.
  • the method further includes: the first access network device determining the second access network device according to the identity of the first PLMN.
  • the network change information includes an index of the RFSP policy
  • the RFSP policy indicates that the frequency point corresponding to the second access network device has the highest priority
  • the second access network device has the highest priority.
  • the network equipment belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located.
  • the first access network equipment triggers the terminal equipment to change to the first PLMN, including: the first access network equipment
  • the network device sends frequency point priority information to the terminal device, and the frequency point priority information indicates that the frequency point corresponding to the second access network device has the highest priority.
  • the first access network device to send frequency priority information to the terminal device according to the RFSP policy, thereby triggering the terminal device to change to the first PLMN according to the frequency priority information.
  • the network change information also includes the RFSP policy.
  • a communication method is provided, which can be executed by a terminal device, or can also be executed by a component (such as a chip or circuit) of the terminal device. There is no limitation on this.
  • the method is executed by the terminal device.
  • Device execution is used as an example for explanation.
  • the method includes: the terminal device receives an identification of a second access network device from the first access network device, the second access network device belongs to the first PLMN contracted by the terminal device, and the first access network device belongs to the first PLMN.
  • the second PLMN is different from the first PLMN; the terminal device accesses the second access network device according to the identification of the second access network device.
  • the terminal device when the second PLMN accessed by the terminal device is different from the first PLMN, the terminal device can access the second access network device according to the identification of the second access network device from the first access network device. .
  • the terminal device does not need to periodically scan the signal, and can also change from the second PLMN to the first PLMN after moving into the coverage of the first PLMN. Therefore, the power consumption of the terminal device can be saved.
  • the terminal device receives the identification of the second access network device from the first access network device, including: the terminal device receives the identification of the second access network device from the first access network device. Redirection information of the network device, the redirection information includes the identifier of the second access network device; the terminal device accesses the second access network device according to the identifier of the second access network device, including: the terminal device Redirecting to the second access network device according to the identifier of the second access network device.
  • the terminal device receives the identification of the second access network device from the first access network device, including: the terminal device receives the identification of the second access network device from the first access network device.
  • the radio resource control (RRC) reconfiguration information of the network device includes the identifier of the second access network device; the terminal device accesses the third access network device according to the identifier of the second access network device.
  • the second access network device includes: the terminal device switches to the second access network device according to the identification of the second access network device.
  • the fourth aspect provides a communication method, which can be executed by a terminal device, or can also be executed by a component (such as a chip or a circuit) of the terminal device.
  • a component such as a chip or a circuit
  • the method is described as being executed by the terminal in the following.
  • Device execution is used as an example for explanation.
  • the method includes: the terminal device receives frequency point priority information from the first access network device, the frequency point priority information indicates that the frequency point corresponding to the second access network device has the highest priority, and the second access network device Belongs to terminal equipment label About the first PLMN, the second PLMN to which the first access network device belongs is different from the first PLMN; the terminal device reselects to the second access network device according to the frequency priority information.
  • the terminal device when the second PLMN accessed by the terminal device is different from the first PLMN, the terminal device can perform cell reselection based on the frequency priority information from the first access network device, thereby reselecting the second access network device.
  • Network access equipment In this case, the terminal device does not need to periodically scan the signal, and can also change from the second PLMN to the first PLMN after moving into the coverage of the first PLMN. Therefore, the power consumption of the terminal device can be saved.
  • a communication method is provided, which method can be executed by a communication system including an access management network element and a first access network device.
  • the method includes: the access management network element determines that the terminal device is located within the coverage of the first PLMN contracted by the terminal device, and the second PLMN accessed by the terminal device is different from the first PLMN; the access management network element reports to The first access network device sends network change information, and the network change information is used to instruct the first access network device to trigger the terminal device to change to the first PLMN; the first access network device triggers the terminal device to change to the first PLMN.
  • First PLMN the access management network element determines that the terminal device is located within the coverage of the first PLMN contracted by the terminal device, and the second PLMN accessed by the terminal device is different from the first PLMN; the access management network element reports to The first access network device sends network change information, and the network change information is used to instruct the first access network device to trigger the terminal device to change to the first PLMN; the first access network device triggers the terminal device to change to the first PLMN.
  • First PLMN the access management network element determines that the terminal
  • the network change information includes an identifier of the first PLMN and/or an identifier of a second access network device, and the second access network device belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located, the first access network equipment triggers the terminal equipment to change to the first PLMN, including: the first access network equipment sends a message to the terminal equipment Redirection information, the redirection information includes the identification of the second access network device, and the redirection information is used to instruct the terminal device to redirect to the second access network device.
  • the network change information also includes redirection instruction information
  • the first access network device sends redirection information to the terminal device, including: the first access network device
  • the network device sends the redirection information to the terminal device according to the redirection instruction information.
  • the network change information includes an identifier of the first PLMN and/or an identifier of a second access network device, and the second access network device belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located, the first access network equipment triggers the terminal equipment to change to the first PLMN, including: the first access network equipment initiates the change of the terminal equipment to the first PLMN. Handover process to the second access network device.
  • the network change information also includes switching instruction information
  • the first access network device initiates a switching process of switching the terminal device to the second access network device. , including: the first access network device initiating the handover process according to the handover instruction information.
  • the method further includes: the first access network device determining the second access network device according to the identity of the first PLMN.
  • the network change information includes an index of the RFSP policy
  • the RFSP policy indicates that the frequency point corresponding to the second access network device has the highest priority
  • the second access network device has the highest priority.
  • the network equipment belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located.
  • the first access network equipment triggers the terminal equipment to change to the first PLMN, including: the first access network equipment
  • the network device sends frequency point priority information to the terminal device, and the frequency point priority information indicates that the frequency point corresponding to the second access network device has the highest priority.
  • the method further includes: the access management network element receiving the subscription information of the terminal device from the data management network element or the policy control network element; the access management network element The network element determines the first PLMN subscribed to by the terminal device based on the subscription information.
  • the access management network element sends network change information to the first access network device, including: when the preset conditions are met, the access management network element sends network change information to the first access network device.
  • the first access network device sends the network change information
  • the preset conditions include: the terminal device's residence time in the second PLMN exceeds the first preset value, and/or the terminal device is in the second PLMN. The number of accesses exceeds the second preset value.
  • a communication device in a sixth aspect, includes a processing unit and a transceiver unit.
  • the processing unit is used to determine that the terminal equipment is located within the coverage of the first PLMN subscribed by the terminal equipment, and that the terminal equipment accesses The second PLMN is different from the first PLMN; the transceiver unit is used to send network change information to the first access network device, and the network change information is used to instruct the first access network device to trigger the terminal device to change to the first PLMN.
  • the network change information includes an identity of the first PLMN and/or an identity of a second access network device, and the second access network device belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located.
  • the change is redirection
  • the network change information also includes redirection indication information.
  • the change is a handover
  • the network change information also includes handover indication information.
  • the network change information includes an index of an RFSP policy, and the RFSP policy is used to indicate that the frequency point corresponding to the second access network device has the highest priority, and the second access network device has the highest priority.
  • the access network equipment belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located.
  • the transceiver unit is also used to receive the subscription information of the terminal device from the data management network element or the policy control network element; the processing unit is also used to receive the subscription information according to the contract The information determines the first PLMN subscribed by the terminal device.
  • the transceiver unit is specifically configured to: send the network change information to the first access network device when a preset condition is met, and the preset condition includes: the The residence time of the terminal equipment in the second PLMN exceeds the first preset value, and/or the number of times the terminal equipment accesses the second PLMN exceeds the second preset value.
  • a communication device in a seventh aspect, includes a transceiver unit and a processing unit.
  • the transceiver unit is used to receive network change information from the access management network element.
  • the network change information is used to indicate the first access network.
  • the device triggers the change of the terminal device to a first PLMN, the first PLMN is the PLMN contracted by the terminal device, and the second PLMN to which the first access network device belongs is different from the first PLMN; the processing unit is used to trigger the terminal The equipment is changed to the first PLMN.
  • the network change information includes an identity of the first PLMN and/or an identity of a second access network device, and the second access network device belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located, the transceiver unit is also used to send redirection information to the terminal equipment, the redirection information includes the identification of the second access network equipment, the redirection information The direction information is used to instruct the terminal device to redirect to the second access network device.
  • the network change information further includes redirection instruction information
  • the transceiver unit is specifically configured to send the redirection information to the terminal device according to the redirection instruction information.
  • the network change information includes the first PLMN and/or the identification of a second access network device, the second access network device belongs to the first PLMN, and the second access network device covers the area where the terminal device is located, the processing unit is also used to initiate A handover process for switching the terminal device to the second access network device.
  • the network change information further includes handover instruction information
  • the processing unit is specifically configured to initiate the handover process according to the handover instruction information.
  • the processing unit is further configured to determine the second access network device according to the identity of the first PLMN.
  • the network change information includes an index of the RFSP policy
  • the RFSP policy indicates that the frequency point corresponding to the second access network device has the highest priority
  • the second access network device has the highest priority.
  • the network equipment belongs to the first PLMN, and the second access network equipment covers the area where the terminal equipment is located.
  • the transceiver unit is also used to send frequency point priority information to the terminal equipment, and the frequency point priority information indicates that the The frequency point corresponding to the second access network device has the highest priority.
  • a communication device in an eighth aspect, includes a transceiver unit and a processing unit.
  • the transceiver unit is configured to receive an identification of a second access network device from a first access network device.
  • the second access network device The equipment belongs to the first PLMN contracted by the terminal equipment, and the second PLMN to which the first access network equipment belongs is different from the first PLMN; the processing unit is configured to access the second access network according to the identification of the second access network equipment. Network access equipment.
  • the transceiver unit is specifically configured to receive redirection information from the first access network device, where the redirection information includes an identification of the second access network device. ;
  • the processing unit is specifically configured to redirect to the second access network device according to the identifier of the second access network device.
  • the transceiver unit is specifically configured to receive radio resource control (RRC) reconfiguration information from the first access network device, and the RRC reconfiguration information
  • RRC radio resource control
  • the information includes the identifier of the second access network device
  • the processing unit is specifically configured to switch to the second access network device according to the identifier of the second access network device.
  • a communication device in a ninth aspect, includes a transceiver unit and a processing unit.
  • the transceiver unit is configured to receive frequency priority information from a first access network device, where the frequency priority information indicates a second
  • the frequency point corresponding to the access network device has the highest priority
  • the second access network device belongs to the first PLMN subscribed by the terminal device, and the second PLMN to which the first access network device belongs is different from the first PLMN; this process
  • the unit is configured to reselect the second access network device according to the frequency point priority information.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the method in the above first aspect and any possible implementation manner of the first aspect.
  • the communication device also includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is an access management network element.
  • the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in the access management network element.
  • the communication interface may be an input/output interface.
  • the transceiver can be a transceiver circuit.
  • the input/output interface can be an input/output circuit.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the above second aspect and the method in any possible implementation manner of the second aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a first access network device.
  • the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in the first access network device.
  • the communication interface may be an input/output interface.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the above third aspect and the method in any of the possible implementations of the third aspect, or to implement the method of the above fourth aspect.
  • the communication device also includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a terminal device.
  • the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in a terminal device.
  • the communication interface may be an input/output interface.
  • a processor including: an input circuit, an output circuit and a processing circuit.
  • the processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any one of the possible implementations of the first to fifth aspects.
  • the above-mentioned processor can be one or more chips
  • the input circuit can be an input pin
  • the output circuit can be an output pin
  • the processing circuit can be a transistor, a gate circuit, a flip-flop and various logic circuits, etc.
  • the input signal received by the input circuit may be received and input by, for example, but not limited to, the receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by the transmitter, and the input circuit and the output A circuit may be the same circuit that functions as an input circuit and an output circuit at different times.
  • the embodiments of this application do not limit the specific implementation methods of the processor and various circuits.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to execute the method in any possible implementation manner of the first to fifth aspects.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory may be provided separately from the processor.
  • the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated on the same chip as the processor, or can be set in different On the chip, the embodiment of the present application does not limit the type of memory and the arrangement of the memory and the processor.
  • ROM read-only memory
  • relevant data interaction processes such as sending network change information, may be a process of outputting network change information from the processor, and receiving network change information may be a process of the processor receiving input network change information.
  • the data output by the processor can be output to the transmitter, and the input data received by the processor can be from the receiver.
  • the transmitter and receiver can be collectively called a transceiver.
  • the processing device in the above fourteenth aspect may be one or more chips.
  • the processor in the processing device can be implemented by hardware or software.
  • the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor that reads the memory stored in the memory. It is implemented by the software code of the memory.
  • the memory can be integrated in the processor, or it can be located outside the processor and exist independently.
  • a computer program product includes: a computer program (which may also be called a code, or an instruction).
  • a computer program which may also be called a code, or an instruction.
  • the computer program When the computer program is run, it causes the computer to execute the above-mentioned first aspect to A method in any possible implementation manner of the fifth aspect.
  • a computer-readable storage medium stores a computer program (which can also be called a code, or an instruction). When run on a computer, the computer-readable storage medium causes the above-mentioned first aspect. The method in any possible implementation manner of the fifth aspect is executed.
  • a communication system including the aforementioned first access network device and an access management network element.
  • the access management network element is used to perform any one of the above first aspects and the possibility of the first aspect.
  • the first access network device is configured to perform the method in any one of the above second aspect and the possible implementation manner of the second aspect.
  • the communication system also includes the aforementioned terminal device, which is used to perform the above third aspect and the method in any one of the possible implementations of the third aspect, or is used to perform the above fourth aspect and the third aspect. Any of the four possible implementation methods.
  • Figure 1 is a schematic diagram of a communication system suitable for the method provided by the embodiment of the present application.
  • Figure 2 is a schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 3 is a schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 4 is a schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 5 is a schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 6 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • Figure 7 is a schematic block diagram of a communication device provided by another embodiment of the present application.
  • FIG. 8 is a schematic diagram of a chip system provided by an embodiment of the present application.
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • 5G new radio
  • NR non-terrestrial communication
  • NTN non-terrestrial network
  • the terminal in the embodiment of the present application may refer to a device with wireless transceiver functions, and may be called a terminal (terminal), user equipment (UE), mobile station (MS), or mobile terminal. MT), vehicle-mounted terminal, remote station, remote terminal, etc.
  • the specific form of the terminal can be a mobile phone, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wearable device tablet, a desktop computer, a notebook computer, an all-in-one computer, and a vehicle-mounted terminal.
  • wireless local loop (wireless local loop, WLL) station personal digital assistant (personal digital assistant, PDA), etc.
  • the terminal can be used in the following scenarios: virtual reality (VR), augmented reality (AR), industrial control (industrial control), self-driving (self driving), remote surgery (remote medical) surgery), smart grid, transportation safety, smart city, smart home, etc.
  • Terminals can be fixed or mobile.
  • the terminal may support at least one wireless communication technology, such as LTE, NR, wideband code division multiple access (WCDMA), etc.
  • the access network device in the embodiment of the present application may be a device that provides wireless communication functions for terminals, and may also be called a radio access network (radio access network, RAN) device or a next generation radio access network (next generation). radio access network, NG-RAN), etc.
  • Access network equipment includes but is not limited to: next generation base station (next generation nodeB, gNB), evolved node B (evolved node B, eNB), baseband unit (baseband unit, BBU), transmitting and receiving point (transmitting and receiving) in 5G point (TRP), transmitting point (TP), relay station, access point, etc.
  • the access network equipment can also be a wireless controller, centralized unit (CU), distributed unit (DU), etc.
  • the access network equipment may support at least one wireless communication technology, such as LTE, NR, WCDMA, etc.
  • the access network equipment can be deployed on the ground or on a satellite, which is not limited in this application.
  • the access network equipment involved in the embodiments of this application may be a base station (such as gNB) in the RAN.
  • the base station can be a separate architecture of CU and DU.
  • RAN can be connected to the core network (for example, it can be the core network of long term evolution (LTE), or it can be the 5G core network (5G core, 5GC), etc.).
  • LTE long term evolution
  • 5G core, 5GC 5G core network
  • CU and DU can be understood as the division of base stations from the perspective of logical functions. CU and DU can be physically separated or deployed together. Multiple DUs can share a CU.
  • a DU can also be connected to multiple CUs.
  • CU and DU can be connected through an interface, for example, the F1 interface.
  • CU and DU can be divided according to the protocol layer of the wireless network.
  • the gNB may also include an active antenna unit (active antenna unit, AAU).
  • AAU active antenna unit
  • CU implements some functions of gNB
  • DU implements some functions of gNB.
  • CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and packet data convergence protocol (PDCP) layer functions.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, media access control (MAC) layer and physical (physical, PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical layer
  • the access network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be used as an access network device in the access network (radio access network, RAN) or as an access network device in the core network (core network, CN), which is not limited in this application.
  • CU and DU processing functions according to this protocol layer is only an example, and they can also be divided in other ways.
  • a CU or DU can be divided into functions with more protocol layers.
  • a CU or DU can also be divided into partial processing functions with a protocol layer.
  • FIG. 1 is a schematic diagram of a communication system suitable for the method provided by this application.
  • the communication system may include at least one UE, PLMN-A and PLMN-B.
  • PLMN-A includes 5GC and NG-RAN1
  • PLMN-B includes 5GC and NG-RAN2.
  • 5GC may include but is not limited to: access and mobility management function (AMF) network elements, unified data management (UDM) network elements, policy control function function, PCF) network element, etc.
  • AMF access and mobility management function
  • UDM unified data management
  • PCF policy control function function
  • the AMF network element is mainly used for mobility management and access management, and is responsible for transmitting user policies between terminal equipment and PCF network elements.
  • UDM network elements are used to handle terminal device identification, access authentication, registration, and mobility management.
  • PCF is used to guide network behavior through a unified policy framework and provide policy rule information for control plane functional network elements (such as AMF network elements, etc.).
  • Npcf, Nudm and Namf in (b) in Figure 1 are interface serial numbers. For more descriptions of network elements included in 5GC and the meaning of these interface serial numbers, please refer to the 3rd generation partnership project. 3GPP) technical standards (TS) 23.501. It should be noted that (a) in Figure 1 takes PLMN-A and PLMN-B as including the same 5GC as an example. PLMN-A and PLMN-B may also include different 5GCs.
  • the UE when the UE is within the coverage of PLMN-B, the UE chooses to access PLMN-B, that is, the UE can access 5GC through NG-RAN2.
  • NG-RAN2 instructs the UE to switch to PLMN-A, or the UE reselects to PLMN-A, that is, the UE can access 5GC through NG-RAN1 .
  • PLMN-B is a high-priority network
  • PLMN-B is the home PLMN (HPLMN) of the UE
  • PLMN-A is a low-priority network
  • PLMN-A is the visiting PLMN.
  • VPLMN visitor PLMN
  • the UE when the UE is camping in PLMN-A, the UE will periodically scan the signal so that when the UE moves to the coverage of PLMN-B again, it can quickly access PLMN-B.
  • periodic scanning of signals by the UE will increase the power consumption of the UE.
  • embodiments of the present application provide a communication method in order to optimize the process of the UE returning from a low-priority network to a high-priority network.
  • the access management network element in the embodiment of this application is mainly used for mobility management and access management, and is responsible for transmitting user policies between user equipment and policy control function (PCF) network elements.
  • PCF policy control function
  • the access management network element may be a mobility management entity (MME).
  • MME mobility management entity
  • AMF access and mobility management function
  • the access management network element may be an AMF network element, or may have other names, which are not limited in this application.
  • the policy control network element in the embodiment of this application is used to guide the behavior of the network through a unified policy framework, and provide policy rule information for control plane functional network elements (such as AMF network elements, etc.).
  • control plane functional network elements such as AMF network elements, etc.
  • the policy control network element may be a policy and charging rules function (PCRF) network element.
  • PCF policy and charging rules function
  • the policy control network element may be a PCF network element.
  • the policy control network element may be a PCF network element, or may have other names, which are not limited in this application.
  • the data management network element in the embodiment of this application is used to process user equipment identification, access authentication, registration, mobility management, etc.
  • the data management network element may be a home subscriber server (HSS) network element.
  • HSS home subscriber server
  • the data management network element may be a UDM network element.
  • the data management network element may be a UDM network element, or may have other names, which are not limited in this application.
  • the first access network device and the second access network device may each be one or more of the following: access network devices in the 4G communication system, such as eNB, eNB in the 5G communication system.
  • access network equipment such as gNB, or satellite base station in a satellite communication system.
  • FIG. 2 shows a schematic flow chart of the communication method provided by the embodiment of the present application.
  • the method 200 may include the following steps:
  • the access management network element determines that the terminal device is located within the coverage of the first PLMN, and the second PLMN accessed by the terminal device is different from the first PLMN.
  • the first PLMN is the PLMN contracted by the terminal equipment, or the PLMN configured for the terminal equipment by the home operator of the terminal equipment.
  • the first PLMN is the PLMN to which the terminal device registers first. For example, after the terminal device is powered on, if the terminal device is within the coverage of the first PLMN, the terminal device will preferentially select the first PLMN to access when selecting a network.
  • the first PLMN may also be called a high-priority PLMN of the terminal device, or a high-priority network of the terminal device.
  • the PLMN subscribed by the terminal device or the PLMN configured by the operator for the terminal device is the home PLMN of the terminal device.
  • the PLMN to which the terminal equipment is subscribed or the PLMN configured by the home operator for the terminal equipment has the highest priority among multiple PLMNs managed by the home operator.
  • multiple PLMNs managed by the home operator include PLMN-A and PLMN-B.
  • PLMN-A corresponds to the 4G network
  • PLMN-B corresponds to the 5G network.
  • the priority of PLMN-B is higher than that of PLMN-A.
  • the terminal The PLMN to which the device is subscribed or the PLMN configured by the home operator for the terminal device may be PLMN-B.
  • the PLMN to which the terminal equipment is subscribed or the PLMN configured by the home operator for the terminal equipment may be the PLMN with the largest coverage.
  • the second PLMN is the PLMN where the terminal device currently accesses or camps.
  • the second PLMN is different from the first PLMN, that is, the second PLMN is not the PLMN subscribed by the terminal equipment, or the second PLMN is not the PLMN configured for the terminal equipment by the home operator of the terminal equipment.
  • the second PLMN may also be called a low-priority PLMN of the terminal device, or a low-priority network of the terminal device.
  • the second PLMN is an equivalent PLMN of the HPLMN of the terminal device, or the second PLMN is a visiting PLMN.
  • the fact that the terminal equipment is located within the coverage of the first PLMN means that the terminal equipment can access the first PLMN through the second access network equipment included in the first PLMN. It can also be said that the terminal equipment is located within the coverage of the second access network equipment included in the first PLMN.
  • the second access network device is any access network device included in the first PLMN.
  • the access management network element may determine that the terminal device is located within the coverage of the first PLMN according to the location information and local configuration information of the terminal device. For example, if the local configuration information of the access management network element includes the location area information covered by the first PLMN, the access management network element can determine the coverage of the first PLMN based on the location area information covered by the first PLMN, and further can determine the coverage of the first PLMN based on the terminal device. The location information determines whether the terminal device is located within the coverage of the first PLMN.
  • the access management network element may determine the coverage of each access network device included in the first PLMN based on the local configuration information, and further determine whether the terminal device is located within the coverage of the access network device included in the first PLMN based on the location information of the terminal device.
  • the local configuration information includes the ephemeris information of each satellite base station in the at least one satellite base station, and the access management network element can then access the management network element according to the location information of the terminal device and the at least one satellite.
  • the ephemeris information of the base station determines whether the terminal device is within the coverage of the satellite base station.
  • Ephemeris information includes the inclination of the satellite's orbital plane, the right ascension of the ascending point, the semi-major axis of the orbital ellipse, the eccentricity of the orbital ellipse, the perigee angular distance and the satellite's periapsis time, etc.
  • the access management network element may determine that the terminal device is located within the coverage of the first PLMN based on the location information of the terminal device, local configuration information and the obtained location area information covered by at least one access network device.
  • the local configuration information of the access management network element includes the identity of at least one access network device included in the first PLMN, Then the access management network element can determine at least one access network device included in the first PLMN according to the local configuration information. If the access management network element communicates with the at least one access network device to obtain the location covered by the at least one access network device.
  • the access management network element can determine the coverage of at least one access network device included in the first PLMN, and further determine whether the terminal device is located within the coverage of the access network device included in the first PLMN based on the location information of the terminal device. within the range.
  • the access management network element can also communicate with the ephemeris information network element to obtain the location area information or ephemeris information covered by the satellite base station.
  • the access management network element can determine the coverage of at least one satellite base station included in the first PLMN, and further determine whether the terminal device is located within the coverage of the satellite base station included in the first PLMN according to the location information of the terminal device.
  • the ephemeris information network element is used to collect the ephemeris information of the satellite base station. It can be a network-side device independent of the satellite base station and the 5G core network, or it can be set in the 5G core network.
  • the embodiment of the present application does not limit the way in which the access management network element determines the first PLMN.
  • the access management network element determines the first PLMN according to the local configuration information, that is, determines the PLMN subscribed by the terminal device or the PLMN configured for the terminal device by the home operator according to the local configuration information.
  • the local configuration information of the access management network element includes a corresponding relationship between the identifier of the terminal device and a first PLMN identifier (identifier, ID).
  • the first PLMN ID is used to identify the first PLMN. It can be understood that when the terminal device accesses or resides in the second PLMN through the access management network element, the access management network element can obtain the identity of the terminal device, and then the access management network element determines the identity of the terminal device according to the local configuration information.
  • the first PLMN ID corresponding to the identification, and determine the first PLMN identified by the first PLMN ID.
  • the first PLMN ID consists of mobile country code (mobile contrary code, MCC) and mobile network number (mobile net code, MNC).
  • MCC uniquely represents the country to which the mobile user belongs.
  • China's MCC is represented by 460.
  • MNC uniquely represents the network in the corresponding country.
  • China Mobile's global system for mobile communications (GSM) network is represented by 00
  • China Unicom's GSM network is represented by 01.
  • the access management network element will configure the access management network element according to the multiple PLMN IDs.
  • the priority information of each PLMN determines that the first PLMN is the PLMN with the highest priority among the multiple PLMNs.
  • the access management network element determines the first PLMN based on the subscription information of the terminal equipment, that is, determines the PLMN subscribed by the terminal equipment or the PLMN configured for the terminal equipment by the home operator based on the subscription information of the terminal equipment.
  • the method 200 also includes S211 and S212.
  • the access management network element sends a request message to the first network element.
  • the first network element may be a policy control network element or a data management network element.
  • the request message includes the identification of the terminal device, and is used to request the subscription information of the terminal device.
  • the first network element sends the subscription information of the terminal device to the access management network element.
  • the first network element determines the subscription information of the terminal device according to the identification of the terminal device, and sends the subscription information of the terminal device to the access management network element.
  • the subscription information of the terminal device includes the PLMN ID contracted by the terminal device or the PLMN ID configured by the home operator for the terminal device, that is, the subscription information of the terminal device includes the first PLMN ID.
  • the request message sent by the access management network element may be UDM service interface_subscription data management_acquisition request message
  • UDM service interface_subscription Data management_getting messages can be represented by Nudm_SubscribeDataManagement_Get request.
  • the data management network element can obtain a response message to the access management network through the UDM service interface_Signing Data Management_ To send the subscription information of the terminal device, the UDM service interface_Subscribe Data Management_Get response message can be represented by Nudm_SubscribeDataManagement_Get response.
  • the request message sent by the access management network element may be a UDM service interface_subscription data management_subscription message, and the UDM service interface_subscription data management_subscription message may be represented by Nudm_SubscribeDataManagement_Subscribe.
  • the data management network element can send the subscription information of the terminal device to the access management network element through the UDM service interface_Subscribe Data Management_Notification, and the UDM service interface_Subscribe Data Management_Notify can be represented by Nudm_SubscribeDataManagement_Notify .
  • the request message sent by the access management network element may be a PCF serviced interface_access management policy control_establish request message, PCF serviced interface
  • the _Access Management Policy Control_Create request message can be represented by Npcf_AMPolicyControl_Create request.
  • the policy control network element can send the subscription information of the terminal device to the access management network element through the PCF service interface_access management policy control_establishment response message, PCF service interface_access management policy control _The creation response message can be represented by Npcf_AMPolicyControl_Create response.
  • the request message sent by the access management network element may be the PCF serviced interface_access management policy control_update request message, and the PCF serviced interface_access management policy control_update request message may be Npcf_AMPolicyControl_Update request.
  • the policy control network element can send the subscription information of the terminal device to the access management network element through the PCF service interface_access management policy control_update response message, PCF service interface_access management policy control _The update response message can be represented by Npcf_AMPolicyControl_Update response.
  • the first network element can also send the subscription information of the terminal device to the access management network element. For example, when the subscription information of the terminal device changes, the first network element sends the subscription information of the terminal device to the access management network element.
  • the access management network element After receiving the subscription information of the terminal device, the access management network element determines the first PLMN based on the subscription information.
  • the embodiment of this application does not limit the timing when the access management network element obtains the subscription information of the terminal device from the first network element, as long as the access management network element obtains the terminal device from the first network element before executing S210.
  • the contract information of the equipment is sufficient.
  • the access management network element may execute S210 after acquiring the subscription information of the terminal device, or may execute S210 after acquiring the subscription information of the terminal device.
  • the access management network element determines whether the terminal device is located within the coverage of the first PLMN, and the access management network element determines whether the second PLMN accessed by the terminal device is different from the first PLMN. If the terminal device is located in Within the coverage of the first PLMN, and the second PLMN accessed by the terminal device is different from the first PLMN, then perform S210. It should be noted that the embodiments of this application do not limit the execution time of the following two items: the access management network element determines whether the terminal device is within the coverage of the first PLMN, and the access management network element determines whether the terminal device is connected to the first PLMN. Whether the entered second PLMN is different from the first PLMN.
  • the access management network element determines whether the terminal device is within the coverage of the first PLMN, and determines the third PLMN to which the terminal device accesses. Whether the second PLMN is different from the first PLMN.
  • the access management network element determines that the terminal device is is located within the coverage of the first PLMN, and determines whether the second PLMN is different from the first PLMN.
  • the access management network element determines whether the terminal device is within the coverage of the first PLMN, and determines whether the second PLMN to which the terminal device accesses is consistent with the coverage of the first PLMN.
  • the first PLMN is different.
  • the access management network element receives a service request message from the terminal device, the service request message includes the second PLMN ID, or if the access management network element receives a protocol data unit (protocol data unit) from the terminal device data unit, PDU) session establishment request (PDU session establishment request) message.
  • the PDU session establishment request message includes the ID of the second PLMN.
  • the access management network element determines whether the terminal device is within the coverage of the first PLMN, and determines whether the terminal device is within the coverage of the first PLMN. Whether the second PLMN is different from the first PLMN.
  • the second PLMN ID refers to the description of the first PLMN ID above.
  • the access management network element periodically determines whether the terminal device is within the coverage of the first PLMN according to the period T, and determines whether the terminal device is within the coverage of the first PLMN. Whether the second PLMN accessed by the terminal device is different from the first PLMN.
  • the period T is preconfigured or predefined by the protocol, and the value of the period T can be 1 second, 1 minute, 1 hour, etc., which is not limited in the embodiment of the present application.
  • the access management network element when the access management network element obtains the subscription information of the terminal device, the access management network element determines whether the terminal device is within the coverage of the first PLMN, and determines the third PLMN to which the terminal device accesses. Whether the second PLMN is different from the first PLMN.
  • the access management network element determines whether the terminal device is located within the coverage of the first PLMN, and determines whether the terminal device Whether the accessed second PLMN is different from the first PLMN.
  • the access management network element determines that the terminal device is located within the coverage of the first PLMN, and the second PLMN accessed by the terminal device is different from the first PLMN, then the method 200 continues to perform S220.
  • the method 200 further includes S213.
  • the access management network element determines that the preset conditions are met.
  • the preset conditions include: the residence time of the terminal equipment in the second PLMN exceeds the first preset value, and/or the number of times the terminal equipment accesses the second PLMN exceeds the second preset value.
  • the first preset value is preconfigured or protocol predefined
  • the second preset value is preconfigured or protocol predefined, which is not limited in the embodiments of this application.
  • the residence time of the terminal equipment in the second PLMN is the continuous residence time of the terminal equipment in the second PLMN, that is, the timing starts when the terminal equipment accesses the second PLMN. If the terminal equipment remains connected to the second PLMN, it continues. Timing. If the terminal device switches or reselects from the second PLMN to another PLMN, the timing is stopped, and the timing is restarted after the terminal device accesses the second PLMN next time.
  • the number of times the terminal device accesses the second PLMN is the number of consecutive times the terminal device accesses the second PLMN, that is, after the terminal device accesses the second PLMN, counting starts from the number of times the terminal device accesses the second PLMN. If the terminal device remains connected to the second PLMN, the number of times the terminal device accesses the second PLMN is continuously counted. If the terminal device switches or reselects from the second PLMN to another PLMN, the counting of access times is stopped. After the terminal device accesses the second PLMN next time, the number of access times of the terminal device in the second PLMN will be counted again.
  • the method 200 continues to execute S220.
  • S220 The access management network element sends network change information to the first access network device.
  • the first access network device receives network change information from the access management network element.
  • the network change information is used to instruct the first access network device to trigger the terminal device to change access to the first PLMN.
  • the network change information includes the first PLMN ID and/or the identification of the second access network device, the second access network device belongs to the first PLMN, and the second access network device covers the location of the terminal device. Area.
  • the access management network element determines that the terminal device is located within the coverage of the first PLMN, but cannot determine which access network device included in the first PLMN the terminal device is within, the access management network element will report to the first access network device.
  • the network change information sent by the network device includes the first PLMN ID. If the access management network element determines that the terminal device is within the coverage of the second access network device included in the first PLMN, the network change information sent by the access management network element to the first access network device includes the second access network device.
  • the identifier of the device or includes the first PLMN ID and the identifier of the second access network device.
  • the network change information may also include redirection instruction information.
  • the redirection instruction information is used to instruct the first access network device to trigger the terminal device to redirect to the first PLMN. Further, the redirection instruction information can be used to instruct the first access network device to trigger the terminal device to redirect to the first PLMN.
  • the second access network equipment. The redirection instruction information may also be called reselection instruction information.
  • the network change information may also include handover instruction information.
  • the switching instruction information is used to instruct the first access network device to trigger the terminal device to switch to the first PLMN. Further, the switching instruction information can be used to instruct the first access network device to trigger the terminal device to switch to the second access of the first PLMN. network equipment.
  • the network change information includes a radio access technology (RAT)/frequency selection priority (RAT frequency selection priority, RFSP) policy and/or an index of the RFSP policy.
  • RAT radio access technology
  • RFSP frequency selection priority
  • the RFSP policy may be used to instruct the first access network device to trigger migration of the terminal device to the first PLMN.
  • the RFSP policy may indicate that the frequency point corresponding to the second access network device has the highest priority.
  • the RFSP policy includes the frequency point corresponding to the second access network device, or the RFSP policy includes the frequency point priority list corresponding to, The frequency point corresponding to the second access network device in the frequency point priority list has the highest priority.
  • the RFSP policy may indicate that the frequency point corresponding to the first PLMN has the highest priority.
  • the RFSP policy includes the frequency point of the first PLMN, or the RFSP policy includes the frequency point priority list corresponding to the frequency point priority list. The frequency point corresponding to the first PLMN has the highest priority.
  • the access management network element determines that the terminal device is within the coverage of the first PLMN, the access management network element obtains the RFSP policy and/or the index of the RFSP policy, and sends the RFSP policy and/or the index of the RFSP policy to the first access management network element.
  • Network access equipment The access management network element obtains the RFSP policy and/or the index of the RFSP policy from the local configuration information.
  • the access management network element determines that the terminal device is located within the coverage of the first PLMN, and the frequency point corresponding to the first PLMN has the highest priority, but it cannot determine which access network device included in the first PLMN the terminal device is located within.
  • the network change information includes the RFSP policy corresponding to the first PLMN and/or the index of the RFSP policy corresponding to the first PLMN.
  • the network change information includes the second access network device.
  • the index of the RFSP policy corresponding to the network access device and/or the RFSP policy corresponding to the second access network device is included in the first PLMN, and the frequency point corresponding to the second access network device has the highest priority.
  • the first access network device triggers the terminal device to change to the first PLMN.
  • the first access network device After receiving the network change information, the first access network device triggers the terminal device to change to the first PLMN according to the network change information.
  • “changing to the first PLMN” can also be understood as “changing access to the first PLMN", which is not limited by this application.
  • the first access network device if the network change information includes the first PLMN ID and/or the identification of the second access network device, the first access network device triggers the terminal device redirection process or handover process according to the network change information, Finally, the terminal equipment is changed to the first PLMN.
  • the first access network device determines to trigger the terminal device to redirect to the first PLMN according to the redirection indication information.
  • the first access network device determines to trigger the terminal device to redirect to the first PLMN, the first access network device triggers the terminal device to change to the first PLMN, including: the first access network device sends a redirection to the terminal device.
  • the redirection information includes the identification of the second access network device.
  • the first access network device sends redirection information to the terminal device through an RRC release (RRC release) message.
  • the first access network device determines to trigger the terminal device to switch to the second access network device in the first PLMN according to the handover instruction information.
  • the first access network device determines to trigger the terminal device to switch to the first PLMN, the first access network device triggers the terminal device to change to the first PLMN, including: the first access network device initiates switching of the terminal device to the second access network device. Switching process of network access equipment. For example, if an Xn interface exists between the first access network device and the second access network device, the first access network device may initiate an Xn-based handover process. For another example, if there is no Xn interface between the first access network device and the second access network device, the first access network device may initiate an N2-based handover process.
  • the first access network device can determine the second access network device based on the first PLMN ID.
  • the first access network device determines the second access network device according to the local configuration information, and the local configuration information of the first access network device includes an identity of at least one access network device included in the first PLMN. For example, if at least one access network device includes one access network device, the first access network device determines the access network device as the second access network device. For another example, if at least one access network device includes multiple access network devices, the first access network device uses any one of the multiple access network devices as the second access network device.
  • the first access network device can determine the second access network device through the handover measurement process, that is, the first access network device instructs the terminal device to Multiple access network devices included in a PLMN perform measurements and report, so that the first access network device determines the second access network device based on the handover measurement report reported by the terminal device.
  • the handover measurement report reported by the terminal device includes multiple If the signal quality of the access network device is determined, the first access network device determines the access network device with the best signal quality among the multiple access network devices as the second access network device according to the handover measurement report.
  • the first access network device sends the frequency point priority to the terminal device according to the RFSP policy and/or the index of the RFSP policy. information to trigger the terminal equipment to reselect a cell according to the frequency point priority information, thereby changing to the first PLMN.
  • the first access network device determines the frequency point priority corresponding to the second access network device according to the RFSP policy. highest, and sends frequency point priority information to the terminal device.
  • the frequency point priority information indicates that the frequency point priority corresponding to the second access network device has the highest priority.
  • the RFSP policy includes the frequency point corresponding to the second access network device
  • the frequency point priority information sent by the first access device to the terminal device may only include the frequency point corresponding to the second access network device.
  • the RFSP policy includes a frequency priority list.
  • the frequency point corresponding to the second access network device has the highest priority. Then the frequency priority information sent by the first access device to the terminal device may include This frequency priority list.
  • the first access network device determines the frequency point according to the RFSP policy. It is determined that the frequency point corresponding to the first PLMN has the highest priority, and frequency point priority information is sent to the terminal device. The frequency point priority information indicates that the frequency point corresponding to the first PLMN has the highest priority.
  • the first access network device first determines the RFSP policy corresponding to the index of the RFSP policy based on the local configuration information, and then sends the frequency priority information to the terminal device according to the RFSP policy.
  • the point priority information indicates that the frequency point corresponding to the second access network device has the highest priority, or indicates that the frequency point corresponding to the first PLMN has the highest priority.
  • the first access network device determines that the RFSP policy corresponding to the index of the RFSP policy includes the frequency point corresponding to the second access network device, then the frequency point priority information sent by the first access network device to the terminal device may only include the second The frequency corresponding to the access network device.
  • the RFSP policy corresponding to the index of the RFSP policy includes a frequency point priority list.
  • the frequency point priority list the frequency point corresponding to the second access network device has the highest priority.
  • the frequency point sent by the first access device to the terminal device Point priority information may include the frequency point priority list.
  • the embodiment of the present application does not limit the timing when the first access network device triggers the terminal device to change to the first PLMN.
  • the first access network device after receiving the network change information, triggers the terminal device to change to the first PLMN.
  • the first access network device after the first access network device receives the network change information, if the terminal device is initiating a service request process, the first access network device triggers the terminal device to change to the third service request process after the service request process.
  • One PLMN One PLMN.
  • S240 The terminal device accesses the second access network device.
  • the terminal device if the terminal device receives redirection information from the first access network device, and the redirection information includes the identity of the second access network device, then the terminal device uses the identity of the second access network device. Redirect to the second access network device.
  • the terminal device receives RRC reconfiguration (RRC configuration) information from the first access network device, and the RRC reconfiguration information includes the identity of the second access network device, then the terminal device performs the configuration according to the second access network device. The identity of the second access network device is switched to the second access network device.
  • RRC reconfiguration RRC configuration
  • the terminal device if the terminal device receives the frequency priority information from the first access network device, the terminal device performs cell reselection based on the frequency priority information to access the second access network. equipment.
  • the access management network element determines that the terminal device is located within the coverage of the first PLMN, and the second PLMN accessed by the terminal device is different from the first PLMN, then the access management network element The network device sends network change information to instruct the first access network device to trigger the terminal device to change to the first PLMN.
  • the access management network element can instruct the first access network device to trigger the terminal device to change to the first PLMN
  • the terminal device does not need to periodically scan the signal, and can also move from the first access network device to the coverage area of the first PLMN.
  • the second PLMN is changed to the first PLMN, so the power consumption of the terminal device can be saved.
  • the access management network element can determine the first PLMN based on the subscription information obtained from the data management network element or the policy control network element. Even if the home operator of the terminal device modifies the first PLMN contracted by the terminal device, the access management network element The updated first PLMN may also be determined based on the subscription information of the terminal device, thereby ensuring that when the terminal device moves within the coverage of the updated first PLMN, it can still change to the updated first PLMN.
  • the access management network element can also send network change information to the first access network device when the preset conditions are met, thereby avoiding the terminal device from sending ping-pong handover and reselection.
  • Figure The UE in Figures 3 to 5 is an example of the terminal device described in Figure 2
  • the AMF is an example of the access management network element described in Figure 2
  • NG-RAN1 is the first access network device described in Figure 2.
  • NG-RAN2 is an example of the second access network device described in Figure 2
  • PCF is an example of the policy control network element described in Figure 2
  • UDM is an example of the data management network element described in Figure 2.
  • the method described in this application is not only applicable to 5G communication systems, but other types of communication systems can also refer to the method described in this application, which will not be described again.
  • Figure 3 shows a schematic flow chart of the communication method provided by the embodiment of the present application.
  • the method 300 shown in Figure 3 may include the following steps:
  • the UE activates services on NG-RAN2.
  • NG-RAN2 belongs to the first PLMN, and the description of the first PLMN may refer to S210 in the method 200 above.
  • PLMN selection is first performed. If the UE is within the coverage of the first PLMN, the UE may select the first PLMN. After the UE performs PLMN selection, it performs a cell search process. If the UE is within the coverage of NG-RAN2, the UE can select the cell of NG-RAN2 and camp on it. Further, if the UE needs to implement services, the UE accesses 5GC through NG-RAN2 and performs services.
  • S302 The UE switches or reselects from NG-RAN2 to NG-RAN1.
  • NG-RAN1 belongs to the second PLMN, and the description of the second PLMN may refer to S210 in the method 200 above.
  • the UE when the UE is performing services through NG-RAN2, or when the UE is in the connected state (CONNECTED), if the UE moves and the UE moves from the coverage area of the first PLMN to the coverage area of the second PLMN , for example, moving to the coverage area of NG-RAN1 included in the second PLMN, the UE can switch from NG-RAN2 to NG-RAN1.
  • the UE when the UE is in the idle state (IDLE), if the UE moves from the coverage area of the first PLMN to the coverage area of the second PLMN, for example, moves to the coverage area of NG-RAN1 included in the second PLMN , then the UE can perform cell reselection and reselect to the cell of NG-RAN2, that is, the UE is reselected from NG-RAN2 to NG-RAN1.
  • IDLE idle state
  • S303 The UE performs services on NG-RAN1 and records that the accessed network is the second PLMN.
  • the UE switches from NG-RAN2 to NG-RAN1 when performing services through NG-RAN2, the UE will continue to perform services through NG-RAN1 after switching to NG-RAN1.
  • the UE If the UE is reselected from NG-RAN2 to NG-RAN1 after entering the idle state, when the UE needs to implement services, it first accesses the 5GC through NG-RAN1, and then the UE performs services on NG-RAN1.
  • the UE After the UE switches or reselects to NG-RAN1 through NG-RAN2, the UE records that the network currently accessed or camped on is the second PLMN, that is, the second PLMN ID is saved.
  • the UE and NG-RAN1 execute the air interface release process.
  • NG-RAN1 can send an RRC connection release (RRC connection release) message to the UE to instruct the UE to release the air interface.
  • RRC connection release RRC connection release
  • S305 The UE sends service request message #1 to NG-RAN1.
  • the UE After the UE releases the air interface, the UE enters the idle state. Further, if the UE needs to implement services, when performing PLMN selection, the UE preferentially selects the second PLMN according to the saved second PLMN ID. Then the UE performs cell Search and camp on the cell of NG-RAN1. Further, after the UE establishes a connection with NG-RAN1, the UE sends service request message #1 to NG-RAN1 to request implementation of the service.
  • the embodiment of this application takes the service initiated by the UE as an example for description, and the service implemented by the UE may also be initiated by the network. If the service implemented by the UE is initiated by the network, the UE receives the paging request message from NG-RAN1.
  • NG-RAN1 sends service request message #2 to AMF.
  • NG-RAN1 sends the service request message #2 to the AMF according to the service request message #1 to request the implementation of the service for the UE.
  • method 300 also includes S307 and S308.
  • AMF sends a request message to UDM/PCF.
  • S307 and S308 may refer to the descriptions in S211 and S212 in the method 200.
  • the methods of S307 and S308 can also be replaced by the following method: the AMF obtains the UE's subscription information from locally stored information.
  • the AMF determines that the UE is located within the coverage of the first PLMN, and the second PLMN accessed by the UE is different from the first PLMN.
  • S309 may refer to the description in S210 in method 200.
  • method 300 also includes S310.
  • AMF determines that the preset conditions are met.
  • S310 may refer to the description in S213 in method 200.
  • AMF sends network change information to NG-RAN1.
  • the network change information includes the first PLMN ID and/or the identification of NG-RAN2.
  • the network change information also includes redirection instruction information.
  • S311 may refer to the description in S220 in method 200.
  • NG-RAN1 sends redirection information to the UE.
  • the redirection information includes the identification of NG-RAN2.
  • S312 may refer to the description in S230 in method 200.
  • the UE performs redirection.
  • the UE performs redirection according to the identifier of NG-RAN2 in the redirection information, thereby accessing NG-RAN2.
  • the size of the serial number of each process does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not be applied to the implementation process of the embodiment of the present application. constitute any limitation.
  • S307 and S308 can be executed after S306 or before S306.
  • the method shown in Figure 3 can also be performed in a 4G communication system.
  • the AMF in Figure 3 is replaced with MME
  • NG-RAN1 is replaced with RAN1
  • NG-RAN2 is replaced with RAN2
  • UDM is replaced with HSS
  • PCF is replaced with PCRF.
  • the MME can obtain the UE's subscription information from the PCRF. If there is no interface between the MME and the PCRF, the MME can obtain the UE's subscription information from the HSS, which is not limited by this application.
  • the AMF determines that the UE is within the coverage of the first PLMN and the second PLMN accessed by the UE is different from the first PLMN, the AMF sends network change information to NG-RAN1, indicating that NG-RAN1 Trigger the UE to redirect to the first PLMN.
  • the AMF can instruct NG-RAN1 to trigger the UE to redirect to the first PLMN, the UE does not need to scan the signal periodically, and can also change from the second PLMN to the first PLMN after moving into the coverage of the first PLMN. , thus saving the power consumption of the UE.
  • Figure 4 shows a schematic flow chart of the communication method provided by the embodiment of the present application.
  • the method 400 shown in Figure 4 may include the following steps:
  • the UE activates the service on NG-RAN2.
  • S402 The UE switches or reselects from NG-RAN2 to NG-RAN1.
  • NG-RAN1 belongs to the second PLMN, and the description of the second PLMN may refer to S210 in the method 200 above.
  • S403 The UE performs services on NG-RAN1 and records that the accessed network is the second PLMN.
  • S405 The UE sends service request message #1 to NG-RAN1.
  • NG-RAN1 sends service request message #2 to AMF.
  • method 400 also includes S407 and S408.
  • AMF sends a request message to UDM/PCF.
  • UDM/PCF sends the UE's subscription information to the AMF.
  • S407 and S408 may refer to the descriptions in S211 and S212 in the method 200.
  • the AMF determines that the UE is located within the coverage of the first PLMN, and the second PLMN accessed by the UE is different from the first PLMN.
  • S409 may refer to the description in S210 in method 200.
  • method 400 also includes S410.
  • AMF determines that the preset conditions are met.
  • S410 may refer to the description in S213 in method 200.
  • AMF sends network change information to NG-RAN1.
  • the network change information includes the first PLMN ID and/or the identification of NG-RAN2.
  • the network change information also includes switching instruction information.
  • S411 may refer to the description in S220 in method 200.
  • NG-RAN1 initiates the handover process.
  • NG-RAN1 initiates the handover process of handing over the UE to NG-RAN2.
  • S412 may refer to the description in S230 in method 200.
  • the size of the sequence number of each process does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not be applied to the implementation process of the embodiment of the present application. constitute any limitation.
  • S407 and S408 can be executed after S406 or before S406.
  • the method shown in Figure 4 can also be performed in a 4G communication system.
  • the AMF in Figure 4 is replaced with MME
  • NG-RAN1 is replaced with RAN1
  • NG-RAN2 is replaced with RAN2
  • UDM is replaced with HSS
  • PCF is replaced with PCRF.
  • the MME can obtain the UE's subscription information from the PCRF. If there is no interface between the MME and the PCRF, the MME can obtain the UE's subscription information from the HSS, which is not limited by this application.
  • the AMF determines that the UE is located within the coverage of the first PLMN, and the third PLMN accessed by the UE If the second PLMN is different from the first PLMN, the AMF sends network change information to NG-RAN1, instructing NG-RAN1 to trigger the UE to switch to the first PLMN.
  • the AMF can instruct NG-RAN1 to trigger the UE to switch to the first PLMN, the UE does not need to scan the signal periodically, and can also change from the second PLMN to the first PLMN after moving into the coverage of the first PLMN. Therefore, the power consumption of the UE can be saved.
  • Figure 5 shows a schematic flow chart of the communication method provided by the embodiment of the present application.
  • the method 500 shown in Figure 5 may include the following steps:
  • the UE activates the service on NG-RAN2.
  • S502 The UE switches or reselects from NG-RAN2 to NG-RAN1.
  • S503 The UE performs services on NG-RAN1 and records that the accessed network is the second PLMN.
  • S505 The UE sends service request message #1 to NG-RAN1.
  • NG-RAN1 sends service request message #2 to AMF.
  • method 500 also includes S507 and S508.
  • AMF sends a request message to UDM/PCF.
  • UDM/PCF sends the UE's subscription information to the AMF.
  • S507 and S508 may refer to the descriptions in S211 and S212 in the method 200.
  • the AMF determines that the UE is located within the coverage of the first PLMN, and the second PLMN accessed by the UE is different from the first PLMN.
  • S509 may refer to the description in S210 in method 200.
  • method 500 also includes S510.
  • AMF determines that the preset conditions are met.
  • S510 may refer to the description in S213 in method 200.
  • AMF sends network change information to NG-RAN1.
  • the network change information includes the RFSP policy and/or the index of the RFSP policy.
  • the RFSP policy please refer to the description in S220 in method 200.
  • S511 may refer to the description in S220 in method 200.
  • NG-RAN1 sends frequency priority information to the UE.
  • the frequency point priority information indicates that the frequency point corresponding to NG-RAN2 has the highest priority.
  • S512 may refer to the description in S230 in method 200.
  • the UE performs cell reselection.
  • the UE performs cell reselection based on the frequency priority information, thereby reselecting the cell of NG-RAN2.
  • the size of the sequence number of each process does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not be applied to the implementation process of the embodiment of the present application. constitute any limitation.
  • S507 and S508 can be executed after S506 or before S506.
  • NG-RAN1 can send frequency point priority information to the UE according to the RFSP policy, so that the UE performs cell reselection to reselect the cell of NG-RAN2.
  • the UE does not need to scan the signal periodically, and can also After moving into the coverage of the first PLMN, the UE is changed from the second PLMN to the first PLMN, so the power consumption of the UE can be saved.
  • FIG. 6 is a schematic block diagram of a communication device 1000 provided by an embodiment of the present application.
  • the communication device 1000 may include: a transceiver unit 1010 and a processing unit 1020 .
  • the communication device 1000 may be the access management network element in the above method embodiment, or may be a chip used to implement the functions of the access management network element in the above method embodiment.
  • the communication device 1000 may correspond to the access management network element in the method 200 in the embodiment of the present application, or correspond to the AMF in the method 300, the method 400 or the method 500, and the communication device 1000 may include a device configured to perform the steps in Figure 2
  • the unit of the method performed by the access management network element in the method 200 or may include a unit for performing the method performed by the AMF in the method 300 in Figure 3, the method 400 in Figure 4, or the method 500 in Figure 5 .
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively the corresponding processes of the method 200 in FIG. 2, the method 300 in FIG. 3, the method 400 in FIG. 4, or the method 500 in FIG. 5. . It should be understood that the specific process of each unit performing the above corresponding steps has been described in detail in the above method embodiments, and will not be described again for the sake of brevity.
  • the communication device 1000 may be the first access network device in the above method embodiment, or may be used to implement the functions of the first access network device in the above method embodiment. chip.
  • the communication device 1000 may correspond to the first access network device in the method 200 of the embodiment of the present application, or correspond to the NG-RAN1 in the method 300, the method 400 or the method 500, and the communication device 1000 may include a user.
  • Units for performing the method performed by the first access network device in the method 200 in Figure 2 or may include a unit for performing the method 300 in Figure 3, the method 400 in Figure 4, or the method 500 in Figure 5
  • the unit of the method executed by NG-RAN1.
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the method 200 in Figure 2, the method 300 in Figure 3, the method 400 in Figure 4 or the method 500 in Figure 5. process. It should be understood that the specific process of each unit performing the above corresponding steps has been described in detail in the above method embodiments, and will not be described again for the sake of brevity.
  • transceiver unit 1010 in the communication device 1000 may correspond to the transceiver 2020 in the communication device 2000 shown in FIG. 7
  • processing unit 1020 in the communication device 1000 may correspond to the communication device shown in FIG. 7 Processors in 2000 and 2010.
  • the chip when the communication device 1000 is a chip, the chip includes a transceiver unit.
  • the chip may also include a processing unit.
  • the transceiver unit may be an input-output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.
  • the transceiver unit 1010 is used to implement the signal transceiver operation of the communication device 1000
  • the processing unit 1020 is used to implement the signal processing operation of the communication device 1000 .
  • the communication device also includes a storage unit 1030, which is used to store instructions.
  • Figure 7 is a schematic block diagram of a device 2000 provided by an embodiment of the present application.
  • the device 2000 includes: at least one processor 2010.
  • the processor 2010 is coupled to the memory and is used to execute instructions stored in the memory to perform the method described in FIG. 2, FIG. 3, FIG. 4 or FIG. 5.
  • the device 2000 also includes a transceiver 2020.
  • the processor 2010 is coupled to the memory and is used to execute instructions stored in the memory to control the transceiver 2020 to send signals. and/or receive signals.
  • the processor 2010 may control the transceiver 2020 to send network change information and/or receive network change information.
  • the device 2000 also includes a memory 2030 for storing instructions.
  • processor 2010 and the memory 2030 can be combined into one processing device, and the processor 2010 is used to execute the program code stored in the memory 2030 to implement the above functions.
  • the memory 2030 may also be integrated in the processor 2010 or independent of the processor 2010.
  • the transceiver 2020 may include a receiver and a transmitter.
  • the transceiver 2020 may further include an antenna, and the number of antennas may be one or more.
  • the transceiver 2020 may be a communication interface or an interface circuit.
  • the chip When the device 2000 is a chip, the chip includes a transceiver unit and a processing unit.
  • the transceiver unit may be an input-output circuit or a communication interface;
  • the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.
  • FIG 8 is a schematic diagram of a chip system according to an embodiment of the present application.
  • the chip system here may also be a system composed of circuits.
  • the chip system 3000 shown in Figure 8 includes: a logic circuit 3010 and an input/output interface (input/output interface) 3020.
  • the logic circuit is used to couple with the input interface and transmit data (such as the first input interface) through the input/output interface. timing configuration information) to execute the method described in Figure 2, Figure 3, Figure 4 or Figure 5.
  • An embodiment of the present application also provides a processing device, including a processor and an interface.
  • the processor may be used to execute the method in the above method embodiment.
  • the above processing device may be a chip.
  • the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC), or It can be a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller unit , MCU), it can also be a programmable logic device (PLD) or other integrated chip.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processing unit
  • NP network processor
  • DSP digital signal processing circuit
  • MCU microcontroller unit
  • PLD programmable logic device
  • each step of the above method can be completed by instructions in the form of hardware integrated logic circuits or software in the processor.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware processor for execution, or can be executed by a combination of hardware and software modules in the processor.
  • the software module can be located in a random register, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, register, or other mature storage media in this field.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities.
  • each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories.
  • the non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase electrically programmable read-only memory (EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM), which is used as an external cache.
  • the present application also provides a computer program product.
  • the computer program product includes: computer program code.
  • the computer program code When the computer program code is run on a computer, it causes the computer to execute the steps shown in Figures 2 to 5. The method of any one of the embodiments is shown.
  • the present application also provides a computer-readable medium.
  • the computer-readable medium stores program code.
  • the program code When the program code is run on a computer, it causes the computer to execute the steps shown in Figures 2 to 5. The method of any one of the embodiments is shown.
  • this application also provides a system, which includes the aforementioned access management network element and a first access network device.
  • the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented using software, they may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable information medium to another computer-readable storage medium.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more available media integrated.
  • the usable media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., high-density digital video discs (DVD)), or semiconductor media (e.g., solid state disks, SSD)) etc.
  • magnetic media e.g., floppy disks, hard disks, tapes
  • optical media e.g., high-density digital video discs (DVD)
  • DVD digital video discs
  • semiconductor media e.g., solid state disks, SSD
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.

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Abstract

本申请实施例提供了一种通信方法及通信装置。根据本申请的方法，若接入管理网元确定终端设备位于终端设备签约的第一公共陆地移动网络PLMN的覆盖范围内，且终端设备接入的第二PLMN与第一PLMN不同，则接入管理网元向第一接入网设备发送网络变更信息，网络变更信息用于指示第一接入网设备触发终端设备变更至第一PLMN，从而第一接入网设备可以根据网络变更信息触发终端设备变更至第一PLMN。根据本申请的方法，终端设备不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省终端设备的功耗。

Description

一种通信方法及通信装置
本申请要求于2022年04月29日提交中国国家知识产权局、申请号为202210474112.5、申请名称为“一种通信方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信领域，并且更具体地，涉及一种通信方法及通信装置。
背景技术
根据网络建设和运营的实际需要，同一运营商可能部署了多个公共陆地移动网络(public land mobile network，PLMN)。归属于该运营商的不同类别的终端设备可以按照一定的原则要求(例如终端设备优先注册到终端设备签约的PLMN)注册到对应的PLMN，并且认为终端设备优先注册的PLMN是该终端设备的高优先级网络，不同于终端设备优先注册的PLMN的其他PLMN(例如访问PLMN(visited PLMN，VPLMN))是该终端设备的低优先级网络。当终端设备处于高优先级网络的覆盖范围之外时，终端设备可以接入或驻留在低优先级网络。终端设备接入或驻留在低优先级网络时，终端设备将周期性扫描信号，以便于当终端设备重新移动到高优先级网络的覆盖范围内时，能快速接入高优先级网络。但终端设备周期性扫描信号会增加终端设备的功耗。
发明内容
本申请实施例提供一种通信方法，以期优化终端设备从低优先级网络回到高优先级网络的流程。
第一方面，提供了一种通信方法，该方法可以由接入管理网元执行，或者，也可以由接入管理网元的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由接入管理网元执行为例进行说明。
该方法包括：接入管理网元确定终端设备位于该终端设备签约的第一公共陆地移动网络(public land mobile network，PLMN)的覆盖范围内，且该终端设备接入的第二PLMN与该第一PLMN不同；该接入管理网元向第一接入网设备发送网络变更信息，该网络变更信息用于指示该第一接入网设备触发该终端设备变更至该第一PLMN。
基于上述技术方案，接入管理网元确定终端设备位于第一PLMN的覆盖范围内，且终端设备接入的第二PLMN与第一PLMN不同，则接入管理网元向第一接入网设备发送网络变更信息，指示第一接入网设备触发终端设备变更至第一PLMN。在接入管理网元可以指示第一接入网设备触发终端设备变更至第一PLMN的情况下，终端设备不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省终端设备的功耗。
其中，终端设备签约的第一PLMN是终端设备的高优先级网络，不同于第一PLMN的第二PLMN是终端设备的低优先级网络。例如，第二PLMN是访问PLMN(visited PLMN，VPLMN)。
结合第一方面，在第一方面的某些实现方式中，该网络变更信息包括该第一PLMN的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域。
基于上述技术方案，有利于第一接入网设备根据第一PLMN的标识和/或第二接入网设备的标识触发终端设备重定向至第一PLMN，或切换至第一PLMN。
结合第一方面，在第一方面的某些实现方式中，该变更为重定向，该网络变更信息还包括重定向指示信息。
重定向指示信息用于指示第一接入网设备触发终端设备重定向至第一PLMN，或者用于指示第一接入网设备重定向至第一PLMN中的第二接入网设备。
基于上述技术方案，第一接入网设备可以根据重定向指示信息确定触发终端设备重定向至第一PLMN。
结合第一方面，在第一方面的某些实现方式中，该变更为切换，该网络变更信息还包括切换指示信息。
切换指示信息用于指示第一接入网设备触发终端设备切换至第一PLMN，或者用于指示第一接入网设备切换至第一PLMN中的第二接入网设备。
基于上述技术方案，第一接入网设备可以根据切换指示信息确定触发终端设备切换至第一PLMN。
结合第一方面，在第一方面的某些实现方式中，该网络变更信息包括无线接入技术(radio access technology，RAT)/频点选择优先级(RAT frequency selection priority，RFSP)策略的索引，该RFSP策略用于指示第二接入网设备对应的频点的优先级最高，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域。
基于上述技术方案，有利于第一接入网设备根据RFSP策略向终端设备发送频点优先级信息，从而触发终端设备根据频点优先级信息变更至第一PLMN。
可选的，该网络变更信息还包括RFSP策略。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：该接入管理网元接收来自数据管理网元或策略控制网元的该终端设备的签约信息；该接入管理网元根据该签约信息确定该终端设备签约的该第一PLMN。
基于上述技术方案，接入管理网元可以根据从数据管理网元或策略控制网元获取的签约信息确定第一PLMN，即使终端设备的归属运营商修改了终端设备签约的第一PLMN，接入管理网元也可以根据终端设备的签约信息确定更新后的第一PLMN，从而保证终端设备移动到更新后的第一PLMN的覆盖范围内时，仍然可以变更至更新后的第一PLMN。
结合第一方面，在第一方面的某些实现方式中，该接入管理网元向第一接入网设备发送网络变更信息，包括：当满足预设条件时，该接入管理网元向该第一接入网设备发送该网络变更信息，该预设条件包括：该终端设备在该第二PLMN的驻留时长超过第一预设值，和/或，该终端设备在该第二PLMN的接入次数超过第二预设值。
基于上述技术方案，接入管理网元还可以在满足预设条件的情况下，向第一接入网设备发送网络变更信息，从而可以避免终端设备发送乒乓切换和重选。
第二方面，提供了一种通信方法，该方法可以由第一接入网设备执行，或者，也可以由第一接入网设备的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由第一接入网设备执行为例进行说明。
该方法包括：第一接入网设备接收来自接入管理网元的网络变更信息，该网络变更信息用于指示该第一接入网设备触发将终端设备变更至第一PLMN，该第一PLMN是该终端设备签约的PLMN，该第一接入网设备所属的第二PLMN不同于该第一PLMN；该第一接入网设备触发该终端设备变更至该第一PLMN。
基于上述技术方案，当终端设备接入的第二PLMN与第一PLMN不同时，第一接入网设备可以根据来自接入管理网元的网络变更信息，触发终端设备变更至第一PLMN。在第一接入网设备可以根据网络变更信息触发终端设备变更第一PLMN的情况下，终端设备不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省终端设备的功耗。
结合第二方面，在第二方面的某些实现方式中，该网络变更信息包括该第一PLMN的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域，该第一接入网设备触发该终端设备变更至该第一PLMN，包括：该第一接入网设备向该终端设备发送重定向信息，该重定向信息包括该第二接入网设备的标识，该重定向信息用于指示该终端设备重定向至该第二接入网设备。
基于上述技术方案，有利于第一接入网设备根据第一PLMN的标识和/或第二接入网设备的标识触发终端设备重定向至第一PLMN。
结合第二方面，在第二方面的某些实现方式中，该网络变更信息还包括重定向指示信息，该第一接入网设备向该终端设备发送重定向信息，包括：该第一接入网设备根据该重定向指示信息向该终端设备发送该重定向信息。
重定向指示信息用于指示第一接入网设备触发终端设备重定向至第一PLMN，或者用于指示第一接入网设备重定向至第一PLMN中的第二接入网设备。
基于上述技术方案，第一接入网设备可以根据重定向指示信息确定触发终端设备重定向至第一PLMN。
结合第二方面，在第二方面的某些实现方式中，该网络变更信息包括该第一PLMN的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域，该第一接入网设备触发该终端设备变更至该第一PLMN，包括：该第一接入网设备发起将该终端设备切换向至该第二接入网设备的切换流程。
基于上述技术方案，有利于第一接入网设备根据第一PLMN的标识和/或第二接入网设备的标识触发终端设备切换至第一PLMN。
结合第二方面，在第二方面的某些实现方式中，该网络变更信息还包括切换指示信息，该第一接入网设备发起将该终端设备切换至该第二接入网设备的切换流程，包括：该第一接入网设备根据该切换指示信息发起该切换流程。
切换指示信息用于指示第一接入网设备触发终端设备切换至第一PLMN，或者用于指示第一接入网设备切换至第一PLMN中的第二接入网设备。
基于上述技术方案，第一接入网设备可以根据切换指示信息确定触发终端设备切换至第一PLMN。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：该第一接入网设备根据该第一PLMN的标识确定该第二接入网设备。
结合第二方面，在第二方面的某些实现方式中，该网络变更信息包括RFSP策略的索引，该RFSP策略指示第二接入网设备对应的频点的优先级最高，该第二接入网设备属于该第一PLMN，且，该第二接入网设备覆盖该终端设备所在的区域，该第一接入网设备触发该终端设备变更至该第一PLMN，包括：该第一接入网设备向该终端设备发送频点优先级信息，该频点优先级信息指示该第二接入网设备对应的频点的优先级最高。
基于上述技术方案，有利于第一接入网设备根据RFSP策略向终端设备发送频点优先级信息，从而触发终端设备根据频点优先级信息变更至第一PLMN。
可选的，该网络变更信息还包括RFSP策略。
第三方面，提供了一种通信方法，该方法可以由终端设备执行，或者，也可以由终端设备的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由终端设备执行为例进行说明。
该方法包括：终端设备接收来自第一接入网设备的第二接入网设备的标识，该第二接入网设备属于终端设备签约的第一PLMN，该第一接入网设备所属的第二PLMN不同于该第一PLMN；该终端设备根据该第二接入网设备的标识接入该第二接入网设备。
基于上述技术方案，当终端设备接入的第二PLMN与第一PLMN不同时，终端设备可以根据来自第一接入网设备的第二接入网设备的标识，接入第二接入网设备。在此情况下，终端设备不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省终端设备的功耗。
结合第三方面，在第三方面的某些实现方式中，该终端设备接收来自该第一接入网设备的第二接入网设备的标识，包括：该终端设备接收来自该第一接入网设备的重定向信息，该重定向信息包括该第二接入网设备的标识；该终端设备根据该第二接入网设备的标识接入该第二接入网设备，包括：该终端设备根据该第二接入网设备的标识重定向到该第二接入网设备。
结合第三方面，在第三方面的某些实现方式中，该终端设备接收来自该第一接入网设备的第二接入网设备的标识，包括：该终端设备接收来自该第一接入网设备的无线资源控制(radio resource control，RRC)重配置信息，该RRC重配置信息包括该第二接入网设备的标识；该终端设备根据该第二接入网设备的标识接入该第二接入网设备，包括：该终端设备根据该第二接入网设备的标识切换到该第二接入网设备。
第四方面，提供了一种通信方法，该方法可以由终端设备执行，或者，也可以由终端设备的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由终端设备执行为例进行说明。
该方法包括：终端设备接收来自第一接入网设备的频点优先级信息，该频点优先级信息指示第二接入网设备对应的频点的优先级最高，该第二接入网设备属于终端设备签 约的第一PLMN，该第一接入网设备所属的第二PLMN不同于该第一PLMN；该终端设备根据该频点优先级信息重选到该第二接入网设备。
基于上述技术方案，当终端设备接入的第二PLMN与第一PLMN不同时，终端设备可以根据来自第一接入网设备的频点优先级信息进行小区重选，从而重选到第二接入网设备。在此情况下，终端设备不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省终端设备的功耗。
第五方面，提供了一种通信方法，该方法可以由包括接入管理网元和第一接入网设备的通信系统执行。
该方法包括：接入管理网元确定终端设备位于该终端设备签约的第一PLMN的覆盖范围内，且该终端设备接入的第二PLMN与该第一PLMN不同；该接入管理网元向第一接入网设备发送网络变更信息，该网络变更信息用于指示该第一接入网设备触发该终端设备变更至该第一PLMN；该第一接入网设备触发该终端设备变更至该第一PLMN。
结合第五方面，在第五方面的某些实现方式中，该网络变更信息包括该第一PLMN的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域，该第一接入网设备触发该终端设备变更至该第一PLMN，包括：该第一接入网设备向该终端设备发送重定向信息，该重定向信息包括该第二接入网设备的标识，该重定向信息用于指示该终端设备重定向至该第二接入网设备。
结合第五方面，在第五方面的某些实现方式中，该网络变更信息还包括重定向指示信息，该第一接入网设备向该终端设备发送重定向信息，包括：该第一接入网设备根据该重定向指示信息向该终端设备发送该重定向信息。
结合第五方面，在第五方面的某些实现方式中，该网络变更信息包括该第一PLMN的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域，该第一接入网设备触发该终端设备变更至该第一PLMN，包括：该第一接入网设备发起将该终端设备切换向至该第二接入网设备的切换流程。
结合第五方面，在第五方面的某些实现方式中，该网络变更信息还包括切换指示信息，该第一接入网设备发起将该终端设备切换至该第二接入网设备的切换流程，包括：该第一接入网设备根据该切换指示信息发起该切换流程。
结合第五方面，在第五方面的某些实现方式中，该方法还包括：该第一接入网设备根据该第一PLMN的标识确定该第二接入网设备。
结合第五方面，在第五方面的某些实现方式中，该网络变更信息包括RFSP策略的索引，该RFSP策略指示第二接入网设备对应的频点的优先级最高，该第二接入网设备属于该第一PLMN，且，该第二接入网设备覆盖该终端设备所在的区域，该第一接入网设备触发该终端设备变更至该第一PLMN，包括：该第一接入网设备向该终端设备发送频点优先级信息，该频点优先级信息指示该第二接入网设备对应的频点的优先级最高。
结合第五方面，在第五方面的某些实现方式中，该方法还包括：该接入管理网元接收来自数据管理网元或策略控制网元的该终端设备的签约信息；该接入管理网元根据该签约信息确定该终端设备签约的该第一PLMN。
结合第五方面，在第五方面的某些实现方式中，该接入管理网元向第一接入网设备发送网络变更信息，包括：当满足预设条件时，该接入管理网元向该第一接入网设备发送该网络变更信息，该预设条件包括：该终端设备在该第二PLMN的驻留时长超过第一预设值，和/或，该终端设备在该第二PLMN的接入次数超过第二预设值。
第六方面，提供了一种通信装置，该通信装置包括处理单元和收发单元，该处理单元用于确定终端设备位于该终端设备签约的第一PLMN的覆盖范围内，且该终端设备接入的第二PLMN与该第一PLMN不同；该收发单元用于向第一接入网设备发送网络变更信息，该网络变更信息用于指示该第一接入网设备触发该终端设备变更至该第一PLMN。
结合第六方面，在第六方面的某些实现方式中，该网络变更信息包括该第一PLMN的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域。
结合第六方面，在第六方面的某些实现方式中，该变更为重定向，该网络变更信息还包括重定向指示信息。
结合第六方面，在第六方面的某些实现方式中，该变更为切换，该网络变更信息还包括切换指示信息。
结合第六方面，在第六方面的某些实现方式中，该网络变更信息包括RFSP策略的索引，该RFSP策略用于指示第二接入网设备对应的频点的优先级最高，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域。
结合第六方面，在第六方面的某些实现方式中，该收发单元还用于接收来自数据管理网元或策略控制网元的该终端设备的签约信息；该处理单元还用于根据该签约信息确定该终端设备签约的该第一PLMN。
结合第六方面，在第六方面的某些实现方式中，该收发单元具体用于：当满足预设条件时向该第一接入网设备发送该网络变更信息，该预设条件包括：该终端设备在该第二PLMN的驻留时长超过第一预设值，和/或，该终端设备在该第二PLMN的接入次数超过第二预设值。
第七方面，提供了一种通信装置，该通信装置包括收发单元和处理单元，该收发单元用于接收来自接入管理网元的网络变更信息，该网络变更信息用于指示第一接入网设备触发将终端设备变更至第一PLMN，该第一PLMN是该终端设备签约的PLMN，该第一接入网设备所属的第二PLMN不同于该第一PLMN；该处理单元用于触发该终端设备变更至该第一PLMN。
结合第七方面，在第七方面的某些实现方式中，该网络变更信息包括该第一PLMN的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域，该收发单元还用于向该终端设备发送重定向信息，该重定向信息包括该第二接入网设备的标识，该重定向信息用于指示该终端设备重定向至该第二接入网设备。
结合第七方面，在第七方面的某些实现方式中，该网络变更信息还包括重定向指示信息，该收发单元具体用于根据该重定向指示信息向该终端设备发送该重定向信息。
结合第七方面，在第七方面的某些实现方式中，该网络变更信息包括该第一PLMN 的标识和/或第二接入网设备的标识，该第二接入网设备属于该第一PLMN，且该第二接入网设备覆盖该终端设备所在的区域，该处理单元还用于发起将该终端设备切换向至该第二接入网设备的切换流程。
结合第七方面，在第七方面的某些实现方式中，该网络变更信息还包括切换指示信息，该处理单元具体用于根据该切换指示信息发起该切换流程。
结合第七方面，在第七方面的某些实现方式中，该处理单元还用于根据该第一PLMN的标识确定该第二接入网设备。
结合第七方面，在第七方面的某些实现方式中，该网络变更信息包括RFSP策略的索引，该RFSP策略指示第二接入网设备对应的频点的优先级最高，该第二接入网设备属于该第一PLMN，且，该第二接入网设备覆盖该终端设备所在的区域，该收发单元还用于向该终端设备发送频点优先级信息，该频点优先级信息指示该第二接入网设备对应的频点的优先级最高。
第八方面，提供了一种通信装置，该通信装置包括收发单元和处理单元，该收发单元用于接收来自第一接入网设备的第二接入网设备的标识，该第二接入网设备属于终端设备签约的第一PLMN，该第一接入网设备所属的第二PLMN不同于该第一PLMN；该处理单元用于根据该第二接入网设备的标识接入该第二接入网设备。
结合第八方面，在第八方面的某些实现方式中，该收发单元具体用于接收来自该第一接入网设备的重定向信息，该重定向信息包括该第二接入网设备的标识；该处理单元具体用于根据该第二接入网设备的标识重定向到该第二接入网设备。
结合第八方面，在第八方面的某些实现方式中，该收发单元具体用于接收来自该第一接入网设备的无线资源控制(radio resource control，RRC)重配置信息，该RRC重配置信息包括该第二接入网设备的标识；该处理单元具体用于根据该第二接入网设备的标识切换到该第二接入网设备。
第九方面，提供了一种通信装置，该通信装置包括收发单元和处理单元，该收发单元用于接收来自第一接入网设备的频点优先级信息，该频点优先级信息指示第二接入网设备对应的频点的优先级最高，该第二接入网设备属于终端设备签约的第一PLMN，该第一接入网设备所属的第二PLMN不同于该第一PLMN；该处理单元用于根据该频点优先级信息重选到该第二接入网设备。
第十方面，提供了一种通信装置，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及第一方面中任一种可能实现方式中的方法。可选的，该通信装置还包括存储器。可选的，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为接入管理网元。当该通信装置为接入管理网元时，该通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于接入管理网元中的芯片。当该通信装置为配置于接入管理网元中的芯片时，该通信接口可以是输入/输出接口。
可选的，该收发器可以为收发电路。可选的，该输入/输出接口可以为输入/输出电路。
第十一方面，提供了一种通信装置，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，以实现上述第二方面及第二方面中任一种可能实现方式中的方法。可 选的，该通信装置还包括存储器。可选的，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为第一接入网设备。当该通信装置为第一接入网设备时，该通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于第一接入网设备中的芯片。当该通信装置为配置于第一接入网设备中的芯片时，该通信接口可以是输入/输出接口。
第十二方面，提供了一种通信装置，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，以实现上述第三方面及第三方面中任一种可能实现方式中的方法，或者，实现上述第四方面的方法。可选的，该通信装置还包括存储器。可选的，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为终端设备。当该通信装置为终端设备时，该通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于终端设备中的芯片。当该通信装置为配置于终端设备中的芯片时，该通信接口可以是输入/输出接口。
第十三方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。所述处理电路用于通过所述输入电路接收信号，并通过所述输出电路发射信号，使得所述处理器执行第一方面至第五方面中任一种可能实现方式中的方法。
在具体实现过程中，上述处理器可以为一个或多个芯片，输入电路可以为输入管脚，输出电路可以为输出管脚，处理电路可以为晶体管、门电路、触发器和各种逻辑电路等。输入电路所接收的输入的信号可以是由例如但不限于接收器接收并输入的，输出电路所输出的信号可以是例如但不限于输出给发射器并由发射器发射的，且输入电路和输出电路可以是同一电路，该电路在不同的时刻分别用作输入电路和输出电路。本申请实施例对处理器及各种电路的具体实现方式不做限定。
第十四方面，提供了一种处理装置，包括处理器和存储器。该处理器用于读取存储器中存储的指令，并可通过接收器接收信号，通过发射器发射信号，以执行第一方面至第五方面中任一种可能实现方式中的方法。
可选的，所述处理器为一个或多个，所述存储器为一个或多个。
可选的，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
在具体实现过程中，存储器可以为非瞬时性(non-transitory)存储器，例如只读存储器(read only memory，ROM)，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
应理解，相关的数据交互过程例如发送网络变更信息可以为从处理器输出网络变更信息的过程，接收网络变更信息可以为处理器接收输入网络变更信息的过程。具体地，处理器输出的数据可以输出给发射器，处理器接收的输入数据可以来自接收器。其中，发射器和接收器可以统称为收发器。
上述第十四方面中的处理装置可以是一个或多个芯片。该处理装置中的处理器可以通过硬件来实现也可以通过软件来实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存 储的软件代码来实现，该存储器可以集成在处理器中，可以位于该处理器之外，独立存在。
第十五方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当所述计算机程序被运行时，使得计算机执行上述第一方面至第五方面中任一种可能实现方式中的方法。
第十六方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序(也可以称为代码，或指令)，当其在计算机上运行时，使得上述第一方面至第五方面中任一种可能实现方式中的方法被执行。
第十七方面，提供了一种通信系统，包括前述的第一接入网设备和接入管理网元，该接入管理网元用于执行上述第一方面及第一方面中任一种可能实现方式中的方法，该第一接入网设备用于执行上述第二方面及第二方面中任一种可能实现方式中的方法。
可选的，该通信系统还包括前述的终端设备，该终端设备用于执行上述第三方面及第三方面中任一种可能实现方式中的方法，或者，用于执行上述第四方面及第四方面中任一种可能实现方式中的方法。
附图说明
图1是适用于本申请实施例提供的方法的通信系统的示意图；
图2是本申请实施例提供的通信方法的示意性流程图；
图3是本申请实施例提供的通信方法的示意性流程图；
图4是本申请实施例提供的通信方法的示意性流程图；
图5是本申请实施例提供的通信方法的示意性流程图；
图6是本申请实施例提供的通信装置的示意图；
图7是本申请另一实施例提供的通信装置的示意性框图；
图8是本申请实施例提供的一种芯片系统的示意图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：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(5th generation，5G)系统、新无线(new radio，NR)、非地面通信(non-terrestrial network，NTN)系统(例如，可以是卫星通信系统)以及未来的移动通信系统等。
本申请实施例中的终端可以指一种具有无线收发功能的设备，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)、车载终端、远方站、远程终端等。终端具体的形态可以是手机(mobile phone)、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、可穿戴设备平板电脑(pad)、台式机、笔记本电脑、一体机、车载终端、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)等。终端可以应用于如下场景：虚拟现实(virtual reality，VR)、增强现实(augmented reality，AR)、工业控制(industrial control)、无人驾驶(self driving)、远程手术(remote medical  surgery)、智能电网(smart grid)、运输安全(transportation safety)、智慧城市(smart city)、智慧家庭(smart home)等。终端可以是固定的或者移动的。需要说明的是，终端可以支持至少一种无线通信技术，例如LTE、NR、宽带码分多址(wideband code division multiple access，WCDMA)等。
本申请实施例中的接入网设备可以是一种为终端提供无线通信功能的设备，也可称之为无线接入网(radio access network，RAN)设备或下一代无线接入网(next generation radio access network，NG-RAN)等。接入网设备包括但不限于：5G中的下一代基站(next generation nodeB，gNB)、演进型节点B(evolved node B，eNB)、基带单元(baseband unit，BBU)、收发点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、中继站、接入点等。接入网设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、集中单元(centralized unit，CU)、分布单元(distributed unit，DU)等。其中，接入网设备可以支持至少一种无线通信技术，例如LTE、NR、WCDMA等。接入网设备可以部署在地面上，也可以部署在卫星上，本申请实施对此不做限定。
在一些部署中，本申请实施例中所涉及到的接入网设备可以是RAN中的基站(如gNB)等。基站可以是CU和DU的分离架构。RAN可以与核心网相连(例如可以是长期演进(long term evolution，LTE)的核心网，也可以是5G核心网(5G core，5GC)等)。CU和DU可以理解为是对基站从逻辑功能角度的划分。CU和DU在物理上可以是分离的也可以部署在一起。多个DU可以共用一个CU。一个DU也可以连接多个CU。CU和DU之间可以通过接口相连，例如可以是F1接口。CU和DU可以根据无线网络的协议层划分。
可选地，gNB还可以包括有源天线单元(active antenna unit，AAU)。CU实现gNB的部分功能，DU实现gNB的部分功能。比如，CU负责处理非实时协议和服务，实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能。DU负责处理物理层协议和实时服务，实现无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理(physical，PHY)层的功能。AAU实现部分物理层处理功能、射频处理及有源天线的相关功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令，也可以认为是由DU发送的，或者，由DU和AAU发送的。可以理解的是，接入网设备可以为包括CU节点、DU节点、AAU节点中一项或多项的设备。此外，CU可以作为接入网(radio access network，RAN)中的接入网设备，也可以作为核心网(core network，CN)中的接入网设备，本申请对此不做限定。
可以理解的是，对CU和DU处理功能按照这种协议层的划分仅仅是一种举例，也可以按照其他的方式进行划分。例如可以将CU或者DU划分为具有更多协议层的功能。例如，CU或DU还可以划分为具有协议层的部分处理功能。
以5G通信系统为例，图1是适用于本申请提供的方法的通信系统的示意图。如图1中的(a)所示，该通信系统可以包括至少一个UE、PLMN-A和PLMN-B。其中，PLMN-A包括5GC和NG-RAN1，PLMN-B包括5GC和NG-RAN2。如图1中的(b)所示，5GC可包括但不限于：接入和移动性管理功能(access and mobility management function，AMF)网元、统一数据管理(unified data management，UDM)网元、策略控制功能(policy control  function，PCF)网元，等等。其中，AMF网元主要用于移动性管理和接入管理、负责在终端设备与PCF网元之间传递用户策略等。UDM网元用于处理终端设备标识、接入鉴权、注册以及移动性管理等。PCF用于通过统一的策略框架指导网络的行为，为控制面功能网元(例如AMF网元等)提供策略规则信息等。图1中的(b)中的Npcf、Nudm以及Namf为接口序列号，更多关于5GC包括的网元的描述以及这些接口序列号的含义可参考第三代合作伙伴项目(3rd generation partnership project，3GPP)技术标准(technical standards，TS)23.501中的定义。需要说明的是，图1中的(a)以PLMN-A和PLMN-B包括相同的5GC为例，PLMN-A和PLMN-B也可以包括不同的5GC。
如图1中的(a)所示，当UE在PLMN-B的覆盖范围内时，UE选择接入PLMN-B，即UE可以通过NG-RAN2接入5GC。当UE从PLMN-B的覆盖范围移动到PLMN-A的覆盖范围内时，NG-RAN2指示UE切换到PLMN-A，或者UE重选到PLMN-A，即UE可以通过NG-RAN1接入5GC。若对于该UE来说，PLMN-B是高优先级网络，例如，PLMN-B是UE的归属PLMN(home PLMN，HPLMN)，PLMN-A是低优先级网络，例如，PLMN-A是访问PLMN(visited PLMN，VPLMN)，则UE驻留在PLMN-A中时，UE将周期性扫描信号，以便于当UE重新移动到PLMN-B的覆盖范围内时，能快速接入PLMN-B。但UE周期性扫描信号会增加UE的功耗。
有鉴于此，本申请实施例提供一种通信方法，以期优化UE从低优先级网络回到高优先级网络的流程。
需要说明的是，本申请实施例中的接入管理网元主要用于移动性管理和接入管理、负责在用户设备与策略控制功能(policy control function，PCF)网元间传递用户策略等。例如，在4G通信系统中，接入管理网元可以是移动性管理实体(mobile management entity，MME)。又例如，在5G通信系统中，接入管理网元可以是接入和移动性管理功能(access and mobility management function，AMF)网元。在未来通信系统中，接入管理网元可以是AMF网元，或者，还可以有其他的名称，本申请不做限定。
本申请实施例中的策略控制网元用于通过统一的策略框架指导网络的行为，为控制面功能网元(例如AMF网元等)提供策略规则信息等。例如，在4G通信系统中，策略控制网元可以是策略和计费规则功能(policy and charging rules function，PCRF)网元。又例如，在5G通信系统中，该策略控制网元可以是PCF网元。在未来通信系统中，该策略控制网元可以是PCF网元，或者，还可以有其他名称，本申请不做限定。
本申请实施例中的数据管理网元用于处理用户设备标识、接入鉴权、注册以及移动性管理等。例如，在4G通信系统中，该数据管理网元可以是归属用户服务器(home subscriber serve，HSS)网元。又例如，在5G通信系统中，该数据管理网元可以是UDM网元。在未来通信系统中，数据管理网元可以是UDM网元，或者，还可以有其他的名称，本申请不做限定。
本申请实施例中，第一接入网设备和第二接入网设备均可以分别为以下中的一种或多种：4G通信系统中的接入网设备，例如eNB，5G通信系统中的接入网设备，例如gNB，或者卫星通信系统中的卫星基站。
图2示出了本申请实施例提供的通信方法的示意性流程图。该方法200可以包括以下步骤：
S210，接入管理网元确定终端设备位于第一PLMN的覆盖范围内，且终端设备接入的第二PLMN与第一PLMN不同。
第一PLMN是终端设备签约的PLMN，或者是终端设备的归属运营商为终端设备配置的PLMN。第一PLMN是终端设备优先注册的PLMN，例如，终端设备在开机之后，若终端设备位于第一PLMN的覆盖范围内，则终端设备在选择网络时，优先选择第一PLMN接入。第一PLMN也可以称为终端设备的高优先级PLMN，或者称为终端设备的高优先级网络。
示例性的，终端设备签约的PLMN或运营商为终端设备配置的PLMN是终端设备的归属PLMN。又示例性的，终端设备签约的PLMN或归属运营商为终端设备配置的PLMN是归属运营商管理的多个PLMN中优先级最高的。例如，归属运营商管理的多个PLMN包括PLMN-A和PLMN-B，PLMN-A对应4G网络，PLMN-B对应5G网络，PLMN-B的优先级比PLMN-A的优先级高，则终端设备签约的PLMN或归属运营商为终端设备配置的PLMN可以是PLMN-B。又例如，归属运营商管理的多个PLMN中覆盖范围最大的PLMN的优先级最高，则终端设备签约的PLMN或归属运营商为终端设备配置的PLMN可以是该覆盖范围最大的PLMN。
第二PLMN是终端设备当前接入或驻留的PLMN。第二PLMN与第一PLMN不同，即第二PLMN不是终端设备签约的PLMN，或者第二PLMN不是终端设备的归属运营商为终端设备配置的PLMN。第二PLMN也可以称为终端设备的低优先级PLMN，或者称为终端设备的低优先级网络。示例性的，第二PLMN是终端设备的HPLMN的等效PLMN，或者，第二PLMN是访问PLMN。
终端设备位于第一PLMN的覆盖范围内，指的是终端设备可以通过第一PLMN包括的第二接入网设备接入第一PLMN。也可以说，终端设备位于第一PLMN包括的第二接入网设备的覆盖范围内。第二接入网设备是第一PLMN包括的任意一个接入网设备。
示例性的，接入管理网元可以根据终端设备的位置信息和本地配置信息确定终端设备位于第一PLMN的覆盖范围内。例如，接入管理网元的本地配置信息包括第一PLMN覆盖的位置区域信息，则接入管理网元可以根据第一PLMN覆盖的位置区域信息确定第一PLMN的覆盖范围，进而可以根据终端设备的位置信息确定终端设备是否位于第一PLMN的覆盖范围内。又例如，接入管理网元的本地配置信息包括第一PLMN包括的至少一个接入网设备的标识，以及至少一个接入网设备中每个接入网设备覆盖的位置区域信息，则接入管理网元可以根据本地配置信息确定第一PLMN包括的每个接入网设备的覆盖范围，进而可以根据终端设备的位置信息确定终端设备是否位于第一PLMN包括的接入网设备的覆盖范围内。示例性的，若第一PLMN包括至少一个卫星基站，则本地配置信息包括至少一个卫星基站中每个卫星基站的星历信息，进而接入管理网元可以根据终端设备的位置信息和至少一个卫星基站的星历信息，确定终端设备是否位于卫星基站的覆盖范围内。星历信息包括卫星的轨道面的倾角，交升点的赤经，轨道椭圆长半轴，轨道椭圆的偏心率，近地点角距和卫星过近点时刻等。
又示例性的，接入管理网元可以根据终端设备的位置信息、本地配置信息以及获取的至少一个接入网设备覆盖的位置区域信息，确定终端设备位于第一PLMN的覆盖范围内。例如，接入管理网元的本地配置信息包括第一PLMN包括的至少一个接入网设备的标识， 则接入管理网元可以根据本地配置信息确定第一PLMN包括的至少一个接入网设备，若接入管理网元与至少一个接入网设备进行通信获取到至少一个接入网设备覆盖的位置区域信息，则接入管理网元可以确定第一PLMN包括的至少一个接入网设备的覆盖范围，进而可以根据终端设备的位置信息确定终端设备是否位于第一PLMN包括的接入网设备的覆盖范围内。可选的，若第一PLMN包括的至少一个接入网设备中包括卫星基站，则接入管理网元还可以与星历信息网元进行通信获取到卫星基站覆盖的位置区域信息或星历信息，进而接入管理网元可以确定第一PLMN包括的至少一个卫星基站的覆盖范围，进而可以根据终端设备的位置信息确定终端设备是否位于第一PLMN包括的卫星基站的覆盖范围内。星历信息网元用于收集卫星基站的星历信息，可以是独立于卫星基站和5G核心网的网络侧设备，也可以设置于5G核心网。
本申请实施例对接入管理网元确定第一PLMN的方式不做限定。
一种可能的实现方式中，接入管理网元根据本地配置信息确定第一PLMN，即根据本地配置信息确定终端设备签约的PLMN或归属运营商为终端设备配置的PLMN。
接入管理网元的本地配置信息包括终端设备的标识与第一PLMN标识(identifier，ID)的对应关系，第一PLMN ID用于标识第一PLMN。可以理解，当终端设备通过接入管理网元接入或驻留在第二PLMN，则接入管理网元可以获取到终端设备的标识，进而接入管理网元根据本地配置信息确定与终端设备的标识对应的第一PLMN ID，并确定第一PLMN ID标识的第一PLMN。第一PLMN ID由移动国家号码(mobile contrary code，MCC)和移动网号(mobile net code，MNC)组成。其中，MCC唯一表示移动用户的所属国家，例如，中国的MCC用460表示。MNC唯一表示对应国家中的网络，例如，中国移动全球移动通信系统(global system for mobile communications，GSM)网用00表示，中国联通GSM网用01表示。
可选的，若接入管理网元的本地配置信息包括终端设备的标识对应的多个PLMN ID，以及包括多个PLMN ID标识的多个PLMN的优先级信息，则接入管理网元根据多个PLMN的优先级信息确定第一PLMN是多个PLMN中优先级最高的PLMN。
另一种可能的实现方式中，接入管理网元根据终端设备的签约信息确定第一PLMN，即根据终端设备的签约信息确定终端设备签约的PLMN或归属运营商为终端设备配置的PLMN。在该实现方式中，方法200还包括S211和S212。
S211，接入管理网元向第一网元发送请求消息。
第一网元可以是策略控制网元或数据管理网元。
请求消息包括终端设备的标识，请求消息用于请求终端设备的签约信息。
S212，第一网元向接入管理网元发送终端设备的签约信息。
第一网元接收到请求消息之后，根据终端设备的标识确定终端设备的签约信息，并向接入管理网元发送终端设备的签约信息。终端设备的签约信息包括终端设备签约的PLMN ID或归属运营商为终端设备配置的PLMN ID，即终端设备的签约信息包括第一PLMN ID。
示例性的，若第一网元是数据管理网元，则在S211中，接入管理网元发送的请求消息可以是UDM服务化接口_签约数据管理_获取请求消息，UDM服务化接口_签约数据管理_获取消息可以用Nudm_SubscribeDataManagement_Get request表示。相应的，在S212中，数据管理网元可以通过UDM服务化接口_签约数据管理_获取响应消息向接入管理网 元发送终端设备的签约信息，UDM服务化接口_签约数据管理_获取响应消息可以用Nudm_SubscribeDataManagement_Get response表示。
或者，在S211中，接入管理网元发送的请求消息可以是UDM服务化接口_签约数据管理_订阅消息，UDM服务化接口_签约数据管理_订阅消息可以用Nudm_SubscribeDataManagement_Subscribe表示。相应的，在S212中，数据管理网元可以通过UDM服务化接口_签约数据管理_通知向接入管理网元发送终端设备的签约信息，UDM服务化接口_签约数据管理_通知可以用Nudm_SubscribeDataManagement_Notify表示。
示例性的，若第一网元是策略控制网元，则在S211中，接入管理网元发送的请求消息可以是PCF服务化接口_接入管理策略控制_建立请求消息，PCF服务化接口_接入管理策略控制_建立请求消息可以用Npcf_AMPolicyControl_Create request表示。相应的，在S212中，策略控制网元可以通过PCF服务化接口_接入管理策略控制_建立响应消息向接入管理网元发送终端设备的签约信息，PCF服务化接口_接入管理策略控制_建立响应消息可以用Npcf_AMPolicyControl_Create response表示。
或者，在S211中，接入管理网元发送的请求消息可以是PCF服务化接口_接入管理策略控制_更新请求消息，PCF服务化接口_接入管理策略控制_更新请求消息可以用Npcf_AMPolicyControl_Update request表示。相应的，在S212中，策略控制网元可以通过PCF服务化接口_接入管理策略控制_更新响应消息向接入管理网元发送终端设备的签约信息，PCF服务化接口_接入管理策略控制_更新响应消息可以用Npcf_AMPolicyControl_Update response表示。
可选的，若第一网元没有接收到来自接入管理网元的请求消息，第一网元也可以向接入管理网元发送终端设备的签约信息。例如，第一网元在终端设备的签约信息发生变化的情况下，向接入管理网元发送终端设备的签约信息。
接入管理网元接收到终端设备的签约信息之后，根据签约信息确定第一PLMN。
需要说明的是，本申请实施例对接入管理网元从第一网元获取终端设备的签约信息的时机不做限定，只要接入管理网元在执行S210之前从第一网元获取到终端设备的签约信息即可。例如，接入管理网元可以在获取到终端设备的签约信息之后执行S210，也可以在获取到终端设备的签约信息之后，再执行S210。
可以理解的是，接入管理网元确定终端设备是否位于第一PLMN的覆盖范围内，以及，接入管理网元确定终端设备接入的第二PLMN是否与第一PLMN不同，若终端设备位于第一PLMN的覆盖范围内，且终端设备接入的第二PLMN与第一PLMN不同，那么执行S210。需要特别说明的是，本申请实施例对以下两项的执行时间不做限定：接入管理网元确定终端设备是否位于第一PLMN的覆盖范围内，以及，接入管理网元确定终端设备接入的第二PLMN是否与第一PLMN不同。
一种可能的实现方式中，当终端设备通过接入管理网元接入第二PLMN时，接入管理网元确定终端设备是否位于第一PLMN的覆盖范围内，以及确定终端设备接入的第二PLMN是否与第一PLMN不同。
例如，若接入管理网元接收到来自终端设备的注册请求(registration request)消息，注册请求消息包括第二PLMN的标识(identifier，ID)，则接入管理网元确定终端设备是 否位于第一PLMN的覆盖范围内，以及确定第二PLMN是否与第一PLMN不同。
又一种可能的实现方式中，当第二PLMN为终端设备提供业务时，接入管理网元确定终端设备是否位于第一PLMN的覆盖范围内，以及确定终端设备接入的第二PLMN是否与第一PLMN不同。
例如，若接入管理网元接收到来自终端设备的业务请求(service request)消息，业务请求消息包括第二PLMN ID，或者，若接入管理网元接收到来自终端设备的协议数据单元(protocol data unit，PDU)会话建立请求(PDU session establishment request)消息，PDU会话建立请求消息包括第二PLMN的ID，则接入管理网元确定终端设备是否位于第一PLMN的覆盖范围内，以及确定第二PLMN是否与第一PLMN不同。第二PLMN ID参考上文第一PLMN ID的描述。
又一种可能的实现方式中，终端设备接入或驻留在第二PLMN的过程中，接入管理网元按照周期T周期性地确定终端设备是否位于第一PLMN的覆盖范围内，以及确定终端设备接入的第二PLMN是否与第一PLMN不同。其中，周期T是预配置的或者是协议预定义的，周期T的值可以是1秒、1分钟、1小时等，本申请实施例对此不做限定。
再一种可能的实现方式中，当接入管理网元获取到终端设备的签约信息时，接入管理网元确定终端设备是否位于第一PLMN的覆盖范围内，以及确定终端设备接入的第二PLMN是否与第一PLMN不同。
例如，当接入管理网元接收到来自数据管理网元或策略控制网元的终端设备的签约信息时，接入管理网元确定终端设备是否位于第一PLMN的覆盖范围内，以及确定终端设备接入的第二PLMN是否与第一PLMN不同。
若接入管理网元确定终端设备位于第一PLMN的覆盖范围内，且终端设备接入的第二PLMN与第一PLMN不同，则方法200继续执行S220。
可选的，接入管理网元确定终端设备位于第一PLMN的覆盖范围内，且终端设备接入的第二PLMN与第一PLMN之后，方法200还包括S213。
S213，接入管理网元确定满足预设条件。
预设条件包括：终端设备在第二PLMN的驻留时长超过第一预设值，和/或，终端设备在第二PLMN的接入次数超过第二预设值。第一预设值是预配置的，或者是协议预定义，第二预设值是预配置的，或者是协议预定义的，本申请实施例对此不做限定。
终端设备在第二PLMN的驻留时长是终端设备在第二PLMN的连续驻留时长，即从终端设备接入第二PLMN开始计时，若终端设备保持接入至第二PLMN的状态，则持续计时。若终端设备从第二PLMN切换或重选到其他PLMN，则停止计时，终端设备下一次接入第二PLMN之后，再重新开始计时。
终端设备在第二PLMN的接入次数是终端设备在第二PLMN的连续接入次数，即从终端设备接入第二PLMN之后，开始统计终端设备在第二PLMN的接入次数。若终端设备保持接入至第二PLMN的状态，则持续统计终端设备在第二PLMN的接入次数。若终端设备从第二PLMN切换或重选到其他PLMN，则停止对接入次数的统计，终端设备下一次接入第二PLMN之后，再重新统计终端设备在第二PLMN的接入次数。
若接入管理网元确定满足预设条件，则方法200继续执行S220。
S220，接入管理网元向第一接入网设备发送网络变更信息。
相应的，第一接入网设备接收来自接入管理网元的网络变更信息。
网络变更信息用于指示第一接入网设备触发终端设备变更接入至第一PLMN。
一种可能的实现方式中，网络变更信息包括第一PLMN ID和/或第二接入网设备的标识，第二接入网设备属于第一PLMN，且第二接入网设备覆盖终端设备所在的区域。
若接入管理网元确定终端设备位于第一PLMN的覆盖范围内，但无法确定终端设备位于第一PLMN包括的哪个接入网设备的覆盖范围内，则接入管理网元向第一接入网设备发送的网络变更信息包括第一PLMN ID。若接入管理网元确定终端设备位于第一PLMN包括的第二接入网设备的覆盖范围内，则接入管理网元向第一接入网设备发送的网络变更信息包括第二接入网设备的标识，或者，包括第一PLMN ID和第二接入网设备的标识。
可选的，网络变更信息还可以包括重定向指示信息。重定向指示信息用于指示第一接入网设备触发终端设备重定向至第一PLMN，进一步的，重定向指示信息可以用于指示第一接入网设备触发终端设备重定向至该第一PLMN的第二接入网设备。重定向指示信息也可以称为重选指示信息。
可选的，网络变更信息还可以包括切换指示信息。切换指示信息用于指示第一接入网设备触发终端设备切换至第一PLMN，进一步的，切换指示信息可以用于指示第一接入网设备触发终端设备切换至第一PLMN的第二接入网设备。
另一种可能的实现方式中，网络变更信息包括无线接入技术(radio access technology，RAT)/频段选择优先级(RAT frequency selection priority，RFSP)策略和/或RFSP策略的索引(index)。RFSP策略可以用于指示第一接入网设备触发终端设备迁移至第一PLMN。
示例性的，RFSP策略可以指示第二接入网设备对应的频点的优先级最高，例如RFSP策略包括第二接入网设备对应的频点，或者，RFSP策略包括频点优先级列表对应，该频点优先级列表中第二接入网设备对应的频点的优先级最高。
示例性的，RFSP策略可以指示第一PLMN对应的频点的优先级最高，例如RFSP策略包括第一PLMN的频点，或者，RFSP策略包括频点优先级列表对应，该频点优先级列表中第一PLMN对应的频点的优先级最高。
若接入管理网元确定终端设备位于第一PLMN的覆盖范围，则接入管理网元获取RFSP策略和/或RFSP策略的索引，并将RFSP策略和/或RFSP策略的索引发送至第一接入网设备。接入管理网元从本地配置信息中获取RFSP策略和/或RFSP策略的索引。
例如，接入管理网元确定终端设备位于第一PLMN的覆盖范围内，且第一PLMN对应的频点优先级最高，但无法确定终端设备位于第一PLMN包括的哪个接入网设备的覆盖范围内，则网络变更信息包括第一PLMN对应的RFSP策略和/或第一PLMN对应的RFSP策略的索引。
例如，接入管理网元确定终端设备位于第一PLMN包括的第二接入网设备的覆盖范围内，且第二接入网设备对应的频点优先级最高，则网络变更信息包括第二接入网设备对应的RFSP策略和/或第二接入网设备对应的RFSP策略的索引。
S230，第一接入网设备触发终端设备变更至第一PLMN。
第一接入网设备接收到网络变更信息之后，根据网络变更信息触发终端设备变更至第一PLMN。其中，“变更至第一PLMN”也可以理解为“变更接入至第一PLMN”，本申请并不限定。
一种可能的实现方式中，若网络变更信息包括第一PLMN ID和/或第二接入网设备的标识，则第一接入网设备根据网络变更信息触发终端设备重定向流程或切换流程，最终使得终端设备变更至第一PLMN。
示例性的，若网络变更信息包括重定向指示信息，则第一接入网设备根据重定向指示信息，确定触发终端设备重定向至第一PLMN。
进一步地，若第一接入网设备确定触发终端设备重定向至第一PLMN，则第一接入网设备触发终端设备变更至第一PLMN，包括：第一接入网设备向终端设备发送重定向信息，重定向信息包括第二接入网设备的标识。示例性的，第一接入网设备通过RRC释放(RRC release)消息向终端设备发送重定向信息。
示例性的，若网络变更信息包括切换指示信息，则第一接入网设备根据切换指示信息，确定触发终端设备切换至第一PLMN中的第二接入网设备。
若第一接入网设备确定触发终端设备切换至第一PLMN，则第一接入网设备触发终端设备变更至第一PLMN，包括：第一接入网设备发起将终端设备切换至第二接入网设备的切换流程。例如，若第一接入网设备与第二接入网设备之间存在Xn接口，则第一接入网设备可以发起基于Xn的切换流程。又例如，若第一接入网设备与第二接入网设备之间不存在Xn接口，则第一接入网设备可以发起基于N2的切换流程。
一种可能的情况，若网络变更信息包括第一PLMN ID但不包括第二接入网设备的标识，第一接入网设备可以根据第一PLMN ID确定第二接入网设备。第一接入网设备根据本地配置信息确定第二接入网设备，第一接入网设备的本地配置信息包括第一PLMN包括的至少一个接入网设备的标识。例如，若至少一个接入网设备包括一个接入网设备，则第一接入网设备将该接入网设备确定为第二接入网设备。又例如，若至少一个接入网设备包括多个接入网设备，则第一接入网设备将多个接入网设备中的任意一个作为第二接入网设备。又例如，若至少一个接入网设备包括多个接入网设备，则第一接入网设备可以通过切换测量流程确定第二接入网设备，即第一接入网设备指示终端设备对第一PLMN包括的多个接入网设备进行测量并上报，从而第一接入网设备根据终端设备上报的切换测量报告确定第二接入网设备，例如，终端设备上报的切换测量报告包括多个接入网设备的信号质量，则第一接入网设备根据切换测量报告将多个接入网设备中信号质量最好的接入网设备确定为第二接入网设备。
另一种可能的实现方式中，若网络变更信息包括RFSP策略和/或RFSP策略的索引，则第一接入网设备根据RFSP策略和/或RFSP策略的索引，向终端设备发送频点优先级信息，以触发终端设备根据频点优先级信息重选小区，从而变更至第一PLMN。
例如，若网络变更信息包括RFSP策略，RFSP策略指示第二接入网设备对应的频点优先级最高，则第一接入网设备根据RFSP策略确定第二接入网设备对应的频点优先级最高，并向终端设备发送频点优先级信息，该频点优先级信息指示第二接入网设备对应的频点优先级最高。例如，RFSP策略包括第二接入网设备对应的频点，则第一接入设备向终端设备发送的频点优先级信息可以只包括第二接入网设备对应的频点。或者，RFSP策略包括频点优先级列表，该频点优先级列表中第二接入网设备对应的频点优先级最高，则第一接入设备向终端设备发送的频点优先级信息可以包括该频点优先级列表。类似的，若RFSP策略指示第二PLMN对应的频点优先级最高，则第一接入网设备根据RFSP策略确 定第一PLMN对应的频点优先级最高，并向终端设备发送频点优先级信息，该频点优先级信息指示第一PLMN对应的频点优先级最高。
例如，若网络变更信息包括RFSP策略的索引，则第一接入网设备首先根据本地配置信息确定RFSP策略的索引对应的RFSP策略，然后根据RFSP策略向终端设备发送频点优先级信息，该频点优先级信息指示第二接入网设备对应的频点优先级最高，或者，指示第一PLMN对应的频点优先级最高。例如，第一接入网设备确定RFSP策略的索引对应的RFSP策略包括第二接入网设备对应的频点，则第一接入设备向终端设备发送的频点优先级信息可以只包括第二接入网设备对应的频点。或者，RFSP策略的索引对应的RFSP策略包括频点优先级列表，该频点优先级列表中第二接入网设备对应的频点优先级最高，则第一接入设备向终端设备发送的频点优先级信息可以包括该频点优先级列表。
可以理解的是，本申请实施例对第一接入网设备触发终端设备变更至第一PLMN的时机不做限定。
一种可能的实现方式中，第一接入网设备接收到网络变更信息之后，就触发终端设备变更至第一PLMN。
另一种可能的实现方式中，第一接入网设备接收到网络变更信息之后，若终端设备正在发起业务请求流程，则第一接入网设备在业务请求流程之后，触发终端设备变更至第一PLMN。
S240，终端设备接入第二接入网设备。
一种可能的实现方式中，若终端设备接收到来自第一接入网设备的重定向信息，重定向信息包括第二接入网设备的标识，那么终端设备根据第二接入网设备的标识重定向至第二接入网设备。
又一种可能的实现方式中，若终端设备接收到来自第一接入网设备的RRC重配置(RRC configuration)信息，RRC重配置信息包括第二接入网设备的标识，那么终端设备根据第二接入网设备的标识切换至第二接入网设备。
又一种可能的实现方式中，若终端设备接收到来自第一接入网设备的频点优先级信息，那么终端设备根据频点优先级信息进行小区重选，从而接入第二接入网设备。
在本申请实施例中，接入管理网元确定终端设备位于第一PLMN的覆盖范围内，且终端设备接入的第二PLMN与第一PLMN不同，则接入管理网元向第一接入网设备发送网络变更信息，指示第一接入网设备触发终端设备变更至第一PLMN。在接入管理网元可以指示第一接入网设备触发终端设备变更至第一PLMN的情况下，终端设备不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省终端设备的功耗。
此外，接入管理网元可以根据从数据管理网元或策略控制网元获取的签约信息确定第一PLMN，即使终端设备的归属运营商修改了终端设备签约的第一PLMN，接入管理网元也可以根据终端设备的签约信息确定更新后的第一PLMN，从而保证终端设备移动到更新后的第一PLMN的覆盖范围内时，仍然可以变更至更新后的第一PLMN。
此外，接入管理网元还可以在满足预设条件的情况下，向第一接入网设备发送网络变更信息，从而可以避免终端设备发送乒乓切换和重选。
下面结合图3至图5，对本申请实施例提供的通信方法进行说明。需要说明的是，图 3至图5中的UE是图2中所述终端设备的示例，AMF是图2中所述的接入管理网元的示例、NG-RAN1是图2中所述第一接入网设备的示例，NG-RAN2是图2中所述第二接入网设备的示例，PCF是图2中所述策略控制网元的示例，以及UDM是图2中所述数据管理网元的示例。此外，可以理解的是，本申请所述的方法不仅适用于5G通信系统，其他类型的通信系统也可以参考该申请所述的方法，不再赘述。
结合图2，图3示出了本申请实施例提供的通信方法的示意性流程图。图3所示的方法300可以包括以下步骤：
S301，UE在NG-RAN2上激活业务。
NG-RAN2属于第一PLMN，第一PLMN的描述可以参考上文方法200中的S210。
例如，UE开机之后，首先执行PLMN选择。若UE处于第一PLMN的覆盖范围内，则UE可以选择第一PLMN。UE执行PLMN选择之后，执行小区搜索过程。若UE处于NG-RAN2的覆盖范围内，则UE可以选择到NG-RAN2的小区并驻留。进一步地，若UE需要实施业务，则UE通过NG-RAN2接入5GC，并进行业务。
S302，UE从NG-RAN2切换或重选至NG-RAN1。
NG-RAN1属于第二PLMN，第二PLMN的描述可以参考上文方法200中的S210。
一种可能的实现方式中，UE通过NG-RAN2进行业务时，或者说UE处于连接态(CONNECTED)时，若UE发生移动，且UE从第一PLMN的覆盖范围移动到第二PLMN的覆盖范围，例如移动到第二PLMN包括的NG-RAN1的覆盖范围，则UE可以从NG-RAN2切换至NG-RAN1。
另一种可能的实现方式中，UE为空闲态(IDLE)时，若UE从第一PLMN的覆盖范围移动到第二PLMN的覆盖范围，例如移动到第二PLMN包括的NG-RAN1的覆盖范围，则UE可以执行小区重选，并且重选到NG-RAN2的小区，即UE从NG-RAN2重选至NG-RAN1。
S303，UE在NG-RAN1上进行业务，并记录接入的网络是第二PLMN。
换句话说，该UE接入到NG-RAN1后，可以感知到通过NG-RAN1接入到了第二PLMN。
如上所述，若UE通过NG-RAN2进行业务时，从NG-RAN2切换至NG-RAN1，则UE切换到NG-RAN1之后，继续通过NG-RAN1进行业务。
若UE进入空闲态之后，从NG-RAN2重选至NG-RAN1，则UE需要实施业务时，首先通过NG-RAN1接入5GC，然后UE在NG-RAN1上进行业务。
UE通过NG-RAN2切换或重选至NG-RAN1之后，UE记录当前接入或驻留的网络是第二PLMN，即保存第二PLMN ID。
S304，空口释放。
UE通过NG-RAN1进行的业务结束之后，UE和NG-RAN1执行空口释放流程。
例如，NG-RAN1可以向UE发送RRC连接释放(RRC connection release)消息，以指示UE进行空口释放。
S305，UE向NG-RAN1发送业务请求消息#1。
UE进行空口释放之后，UE进入空闲态。进一步地，若UE需要实施业务，则UE在执行PLMN选择时，根据保存的第二PLMN ID优先选择第二PLMN。然后UE进行小区 搜索，驻留到NG-RAN1的小区。进一步地，UE与NG-RAN1建立连接之后，UE向NG-RAN1发送业务请求消息#1，以请求实施业务。
需要说明的是，本申请实施例以UE发起业务为例进行说明，UE实施的业务也可以是网络发起的。如果UE实施的业务是网络发起的，则UE接收来自NG-RAN1的寻呼请求消息。
S306，NG-RAN1向AMF发送业务请求消息#2。
NG-RAN1根据业务请求消息#1向AMF发送业务请求消息#2，以为UE请求实施业务。
可选的，方法300还包括S307和S308。
S307，AMF向UDM/PCF发送请求消息。
S308，UDM/PCF向AMF发送UE的签约信息。
S307和S308可以参考方法200中的S211和S212中的描述。
此外，S307和S308的方法也可以由以下方法代替：AMF从本地保存的信息中获取UE的签约信息。
S309，AMF确定UE位于第一PLMN的覆盖范围内，且UE接入的第二PLMN与第一PLMN不同。
S309可以参考方法200中的S210中的描述。
可选的，方法300还包括S310。
S310，AMF确定满足预设条件。
S310可以参考方法200中的S213中的描述。
S311，AMF向NG-RAN1发送网络变更信息。
网络变更信息包括第一PLMN ID和/或NG-RAN2的标识。可选的，网络变更信息还包括重定向指示信息。
S311可以参考方法200中的S220中的描述。
S312，NG-RAN1向UE发送重定向信息。
重定向信息包括NG-RAN2的标识。
S312可以参考方法200中的S230中的描述。
S313，UE执行重定向。
UE根据重定向信息中的NG-RAN2的标识，执行重定向，从而接入NG-RAN2。
应理解，图3所示的方法中，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。例如，S307和S308既可以在S306之后执行，也可以在S306之前执行。
还应理解，图3所示的方法也可以在4G通信系统中执行。当图3所示的方法在4G通信系统中执行时，图3中的AMF替换为MME，NG-RAN1替换为RAN1，NG-RAN2替换为RAN2，UDM替换为HSS，PCF替换为PCRF。需要说明的是，当MME与PCRF之间存在接口时，MME可以从PCRF获取UE的签约信息。若MME与PCRF不存在接口，MME可以从HSS中获取UE的签约信息，本申请并不限定。
在本申请实施例中，AMF确定UE位于第一PLMN的覆盖范围内，且UE接入的第二PLMN与第一PLMN不同，则AMF向NG-RAN1发送网络变更信息，指示NG-RAN1 触发UE重定向至第一PLMN。在AMF可以指示NG-RAN1触发UE重定向至第一PLMN的情况下，UE不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省UE的功耗。
结合图2，图4示出了本申请实施例提供的通信方法的示意性流程图。图4所示的方法400可以包括以下步骤：
S401，UE在NG-RAN2上激活业务。
S402，UE从NG-RAN2切换或重选至NG-RAN1。
NG-RAN1属于第二PLMN，第二PLMN的描述可以参考上文方法200中的S210。
S403，UE在NG-RAN1上进行业务，并记录接入的网络是第二PLMN。
S404，空口释放。
S405，UE向NG-RAN1发送业务请求消息#1。
S406，NG-RAN1向AMF发送业务请求消息#2。
S401至S406可以参考方法300中的S301至S306中的描述。
可选的，方法400还包括S407和S408。
S407，AMF向UDM/PCF发送请求消息。
S408，UDM/PCF向AMF发送UE的签约信息。
S407和S408可以参考方法200中的S211和S212中的描述。
S409，AMF确定UE位于第一PLMN的覆盖范围内，且UE接入的第二PLMN与第一PLMN不同。
S409可以参考方法200中的S210中的描述。
可选的，方法400还包括S410。
S410，AMF确定满足预设条件。
S410可以参考方法200中的S213中的描述。
S411，AMF向NG-RAN1发送网络变更信息。
网络变更信息包括第一PLMN ID和/或NG-RAN2的标识。可选的，网络变更信息还包括切换指示信息。
S411可以参考方法200中的S220中的描述。
S412，NG-RAN1发起切换流程。
NG-RAN1发起将UE切换至NG-RAN2的切换流程。
S412可以参考方法200中的S230中的描述。
应理解，图4所示的方法中，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。例如，S407和S408既可以在S406之后执行，也可以在S406之前执行。
还应理解，图4所示的方法也可以在4G通信系统中执行。当图4所示的方法在4G通信系统中执行时，图4中的AMF替换为MME，NG-RAN1替换为RAN1，NG-RAN2替换为RAN2，UDM替换为HSS，PCF替换为PCRF。需要说明的是，当MME与PCRF之间存在接口时，MME可以从PCRF获取UE的签约信息。若MME与PCRF不存在接口，MME可以从HSS中获取UE的签约信息，本申请并不限定。
在本申请实施例中，AMF确定UE位于第一PLMN的覆盖范围内，且UE接入的第 二PLMN与第一PLMN不同，则AMF向NG-RAN1发送网络变更信息，指示NG-RAN1触发UE切换至第一PLMN。在AMF可以指示NG-RAN1触发UE切换至第一PLMN的情况下，UE不需要周期性扫描信号，也可以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省UE的功耗。
结合图2，图5示出了本申请实施例提供的通信方法的示意性流程图。图5所示的方法500可以包括以下步骤：
S501，UE在NG-RAN2上激活业务。
S502，UE从NG-RAN2切换或重选至NG-RAN1。
S503，UE在NG-RAN1上进行业务，并记录接入的网络是第二PLMN。
S504，空口释放。
S505，UE向NG-RAN1发送业务请求消息#1。
S506，NG-RAN1向AMF发送业务请求消息#2。
S501至S506可以参考方法300中的S301至S306中的描述。
可选的，方法500还包括S507和S508。
S507，AMF向UDM/PCF发送请求消息。
S508，UDM/PCF向AMF发送UE的签约信息。
S507和S508可以参考方法200中的S211和S212中的描述。
S509，AMF确定UE位于第一PLMN的覆盖范围内，且UE接入的第二PLMN与第一PLMN不同。
S509可以参考方法200中的S210中的描述。
可选的，方法500还包括S510。
S510，AMF确定满足预设条件。
S510可以参考方法200中的S213中的描述。
S511，AMF向NG-RAN1发送网络变更信息。
网络变更信息包括RFSP策略和/或RFSP策略的索引。RFSP策略可以参考方法200中的S220中的描述。
S511可以参考方法200中的S220中的描述。
S512，NG-RAN1向UE发送频点优先级信息。
频点优先级信息指示NG-RAN2对应的频点的优先级最高。
S512可以参考方法200中的S230中的描述。
S513，UE执行小区重选。
UE根据频点优先级信息执行小区重选，从而重选到NG-RAN2的小区。
应理解，图5所示的方法中，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。例如，S507和S508既可以在S506之后执行，也可以在S506之前执行。
在本申请实施例中，AMF确定UE位于第一PLMN的覆盖范围内，且UE接入的第二PLMN与第一PLMN不同，则AMF向NG-RAN1发送RFSP策略和/或RFSP策略的索引，从而NG-RAN1可以根据RFSP策略向UE发送频点优先级信息，从而使得UE执行小区重选，以重选到NG-RAN2的小区。在此情况下，UE不需要周期性扫描信号，也可 以在移动到第一PLMN的覆盖范围内之后，从第二PLMN变更至第一PLMN，因此可以节省UE的功耗。
以上，结合图2至图5详细说明了本申请实施例提供的方法。以下，结合图6至图8详细说明本申请实施例提供的通信装置。应理解，装置实施例的描述与方法实施例的描述相互对应，因此，未详细描述的内容可以参见上文方法实施例，为了简洁，这里不再赘述。
图6是本申请实施例提供的通信装置1000的示意性框图。如图6所示，该通信装置1000可以包括：收发单元1010和处理单元1020。
在一种可能的设计中，该通信装置1000可以是上文方法实施例中的接入管理网元，也可以是用于实现上文方法实施例中接入管理网元的功能的芯片。
应理解，该通信装置1000可对应于本申请实施例方法200中的接入管理网元，或者对应于方法300、方法400或方法500中的AMF，该通信装置可以包括用于执行图2中的方法200中的接入管理网元执行的方法的单元，或者可以包括用于执行图3中的方法300、图4中的方法400或图5中的方法500中的AMF执行的方法的单元。并且，该通信装置1000中的各单元和上述其他操作和/或功能分别为了图2中的方法200、图3中的方法300、图4中的方法400或图5中的方法500的相应流程。应理解，各单元执行上述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，在此不再赘述。
在另一种可能的设计中，该通信装置1000可以是上文方法实施例中的第一接入网设备，也可以是用于实现上文方法实施例中第一接入网设备的功能的芯片。
应理解，该通信装置1000可对应于本申请实施例方法200中的第一接入网设备，，或者对应于方法300、方法400或方法500中的NG-RAN1，该通信装置1000可以包括用于执行图2中的方法200中的第一接入网设备执行的方法的单元，或者可以包括用于执行图3中的方法300、图4中的方法400或图5中的方法500中的NG-RAN1执行的方法的单元。并且，该通信装置1000中的各单元和上述其他操作和/或功能分别为了实现图2中的方法200、图3中的方法300、图4中的方法400或图5中的方法500的相应流程。应理解，各单元执行上述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，在此不再赘述。
还应理解，该通信装置1000中的收发单元1010可对应图7中示出的通信设备2000中的收发器2020，该通信装置1000中的处理单元1020可对应于图7中示出的通信设备2000中的处理器2010。
还应理解，当该通信装置1000为芯片时，该芯片包括收发单元。可选的，该芯片还可以包括处理单元。其中，收发单元可以是输入输出电路或通信接口；处理单元可以为该芯片上集成的处理器或者微处理器或者集成电路。
收发单元1010用于实现通信装置1000的信号的收发操作，处理单元1020用于实现通信装置1000的信号的处理操作。
可选的，该通信装置还包括存储单元1030，该存储单元1030用于存储指令。
图7是本申请实施例提供的装置2000的示意性框图。如图7所示，该装置2000包括：至少一个处理器2010。该处理器2010与存储器耦合，用于执行存储器中存储的指令，以执行图2、图3、图4或图5中所述的方法。可选的，该装置2000还包括收发器2020，该处理器2010与存储器耦合，用于执行存储器中存储的指令，以控制收发器2020发送信 号和/或接收信号，例如，处理器2010可以控制收发器2020发送网络变更信息和/或接收网络变更信息。可选的，该装置2000还包括存储器2030，用于存储指令。
应理解，上述处理器2010和存储器2030可以合成一个处理装置，处理器2010用于执行存储器2030中存储的程序代码来实现上述功能。具体实现时，该存储器2030也可以集成在处理器2010中，或者独立于处理器2010。
还应理解，收发器2020可以包括接收器(或者称，接收机)和发射器(或者称，发射机)。收发器2020还可以进一步包括天线，天线的数量可以为一个或多个。收发器2020又可以是通信接口或者接口电路。
当该装置2000为芯片时，该芯片包括收发单元和处理单元。其中，收发单元可以是输入输出电路或通信接口；处理单元可以为该芯片上集成的处理器或者微处理器或者集成电路。
图8是本申请实施例的一种芯片系统的示意图。这里的芯片系统也可为电路组成的系统。图8所示的芯片系统3000包括：逻辑电路3010以及输入/输出接口(input/output interface)3020，所述逻辑电路用于与输入接口耦合，通过所述输入/输出接口传输数据(例如第一授时配置信息)，以执行图2、图3、图4或图5所述的方法。
本申请实施例还提供了一种处理装置，包括处理器和接口。所述处理器可用于执行上述方法实施例中的方法。
应理解，上述处理装置可以是一个芯片。例如，该处理装置可以是现场可编程门阵列(field programmable gate array，FPGA)，可以是专用集成芯片(application specific integrated circuit，ASIC)，还可以是系统芯片(system on chip，SoC)，还可以是中央处理器(central processor unit，CPU)，还可以是网络处理器(network processor，NP)，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。
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模块组合执行完成。软件模块可以位于随机寄存器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
应注意，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(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。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM， EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。
根据本申请实施例提供的方法，本申请还提供一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码在计算机上运行时，使得该计算机执行图2至图5所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种计算机可读介质，该计算机可读介质存储有程序代码，当该程序代码在计算机上运行时，使得该计算机执行图2至图5所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种系统，其包括前述的接入管理网元和第一接入网设备。
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信息介质向另一个计算机可读存储介质传输。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 disc，SSD))等。
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，机械或其他的形式。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (30)

  1. 一种通信方法，其特征在于，包括：
    接入管理网元确定终端设备位于所述终端设备签约的第一公共陆地移动网络PLMN的覆盖范围内，且所述终端设备接入的第二PLMN与所述第一PLMN不同；
    所述接入管理网元向第一接入网设备发送网络变更信息，所述网络变更信息用于指示所述第一接入网设备触发所述终端设备变更至所述第一PLMN。
  2. 根据权利要求1所述的方法，其特征在于，所述网络变更信息包括所述第一PLMN的标识和/或第二接入网设备的标识，所述第二接入网设备属于所述第一PLMN，且所述第二接入网设备覆盖所述终端设备所在的区域。
  3. 根据权利要求2所述的方法，其特征在于，所述变更为重定向，所述网络变更信息还包括重定向指示信息。
  4. 根据权利要求2所述的方法，其特征在于，所述变更为切换，所述网络变更信息还包括切换指示信息。
  5. 根据权利要求1所述的方法，其特征在于，所述网络变更信息包括无线接入技术/频点选择优先级RFSP策略的索引，所述RFSP策略用于指示第二接入网设备对应的频点的优先级最高，所述第二接入网设备属于所述第一PLMN，且所述第二接入网设备覆盖所述终端设备所在的区域。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    所述接入管理网元接收来自数据管理网元或策略控制网元的所述终端设备的签约信息；
    所述接入管理网元根据所述签约信息确定所述终端设备签约的所述第一PLMN。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述接入管理网元向第一接入网设备发送网络变更信息，包括：
    当满足预设条件时，所述接入管理网元向所述第一接入网设备发送所述网络变更信息，所述预设条件包括：所述终端设备在所述第二PLMN的驻留时长超过第一预设值，和/或，所述终端设备在所述第二PLMN的接入次数超过第二预设值。
  8. 一种通信方法，其特征在于，包括：
    第一接入网设备接收来自接入管理网元的网络变更信息，所述网络变更信息用于指示所述第一接入网设备触发将终端设备变更至第一公共陆地移动网络PLMN，所述第一PLMN是所述终端设备签约的PLMN，所述第一接入网设备所属的第二PLMN不同于所述第一PLMN；
    所述第一接入网设备触发所述终端设备变更至所述第一PLMN。
  9. 根据权利要求8所述的方法，其特征在于，所述网络变更信息包括所述第一PLMN的标识和/或第二接入网设备的标识，所述第二接入网设备属于所述第一PLMN，且所述第二接入网设备覆盖所述终端设备所在的区域，所述第一接入网设备触发所述终端设备变更至所述第一PLMN，包括：
    所述第一接入网设备向所述终端设备发送重定向信息，所述重定向信息包括所述第 二接入网设备的标识，所述重定向信息用于指示所述终端设备重定向至所述第二接入网设备。
  10. 根据权利要求9所述的方法，其特征在于，所述网络变更信息还包括重定向指示信息，所述第一接入网设备向所述终端设备发送重定向信息，包括：
    所述第一接入网设备根据所述重定向指示信息向所述终端设备发送所述重定向信息。
  11. 根据权利要求8所述的方法，其特征在于，所述网络变更信息包括所述第一PLMN的标识和/或第二接入网设备的标识，所述第二接入网设备属于所述第一PLMN，且所述第二接入网设备覆盖所述终端设备所在的区域，所述第一接入网设备触发所述终端设备变更至所述第一PLMN，包括：
    所述第一接入网设备发起将所述终端设备切换向至所述第二接入网设备的切换流程。
  12. 根据权利要求11所述的方法，其特征在于，所述网络变更信息还包括切换指示信息，所述第一接入网设备发起将所述终端设备切换至所述第二接入网设备的切换流程，包括：
    所述第一接入网设备根据所述切换指示信息发起所述切换流程。
  13. 根据权利要求9至12中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一接入网设备根据所述第一PLMN的标识确定所述第二接入网设备。
  14. 根据权利要求8所述的方法，其特征在于，所述网络变更信息包括无线接入技术/频点选择优先级RFSP策略的索引，所述RFSP策略指示第二接入网设备对应的频点的优先级最高，所述第二接入网设备属于所述第一PLMN，且，所述第二接入网设备覆盖所述终端设备所在的区域，所述第一接入网设备触发所述终端设备变更至所述第一PLMN，包括：
    所述第一接入网设备向所述终端设备发送频点优先级信息，所述频点优先级信息指示所述第二接入网设备对应的频点的优先级最高。
  15. 一种通信装置，其特征在于，包括处理单元和收发单元，
    所述处理单元用于确定终端设备位于所述终端设备签约的第一公共陆地移动网络PLMN的覆盖范围内，且所述终端设备接入的第二PLMN与所述第一PLMN不同；
    所述收发单元用于向第一接入网设备发送网络变更信息，所述网络变更信息用于指示所述第一接入网设备触发所述终端设备变更至所述第一PLMN。
  16. 根据权利要求15所述的通信装置，其特征在于，
    所述收发单元还用于接收来自数据管理网元或策略控制网元的所述终端设备的签约信息；
    所述处理单元还用于根据所述签约信息确定所述终端设备签约的所述第一PLMN。
  17. 根据权利要求15或16所述的通信装置，其特征在于，所述收发单元具体用于：当满足预设条件时向所述第一接入网设备发送所述网络变更信息，所述预设条件包括：所述终端设备在所述第二PLMN的驻留时长超过第一预设值，和/或，所述终端设备在所述第二PLMN的接入次数超过第二预设值。
  18. 一种通信装置，其特征在于，包括收发单元和处理单元，
    所述收发单元用于接收来自接入管理网元的网络变更信息，所述网络变更信息用于指示第一接入网设备触发将终端设备变更至第一公共陆地移动网络PLMN，所述第一PLMN是所述终端设备签约的PLMN，所述第一接入网设备所属的第二PLMN不同于所述第一PLMN；
    所述处理单元用于触发所述终端设备变更至所述第一PLMN。
  19. 根据权利要求18所述的通信装置，其特征在于，所述网络变更信息包括所述第一PLMN的标识和/或第二接入网设备的标识，所述第二接入网设备属于所述第一PLMN，且所述第二接入网设备覆盖所述终端设备所在的区域，
    所述收发单元还用于向所述终端设备发送重定向信息，所述重定向信息包括所述第二接入网设备的标识，所述重定向信息用于指示所述终端设备重定向至所述第二接入网设备。
  20. 根据权利要求19所述的通信装置，其特征在于，所述网络变更信息还包括重定向指示信息，
    所述收发单元具体用于根据所述重定向指示信息向所述终端设备发送所述重定向信息。
  21. 根据权利要求18所述的通信装置，其特征在于，所述网络变更信息包括所述第一PLMN的标识和/或第二接入网设备的标识，所述第二接入网设备属于所述第一PLMN，且所述第二接入网设备覆盖所述终端设备所在的区域，
    所述处理单元还用于发起将所述终端设备切换向至所述第二接入网设备的切换流程。
  22. 根据权利要求21所述的通信装置，其特征在于，所述网络变更信息还包括切换指示信息，
    所述处理单元具体用于根据所述切换指示信息发起所述切换流程。
  23. 根据权利要求19至22中任一项所述的通信装置，其特征在于，
    所述处理单元还用于根据所述第一PLMN的标识确定所述第二接入网设备。
  24. 根据权利要求18所述的通信装置，其特征在于，所述网络变更信息包括无线接入技术/频点选择优先级RFSP策略的索引，所述RFSP策略指示第二接入网设备对应的频点的优先级最高，所述第二接入网设备属于所述第一PLMN，且，所述第二接入网设备覆盖所述终端设备所在的区域，
    所述收发单元还用于向所述终端设备发送频点优先级信息，所述频点优先级信息指示所述第二接入网设备对应的频点的优先级最高。
  25. 一种通信装置，其特征在于，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权利要求1至7中任一项所述的方法。
  26. 一种通信装置，其特征在于，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权利要求8至14中任一项所述的方法。
  27. 根据权利要求25或26所述的通信装置，其特征在于，还包括所述存储器。
  28. 一种计算机可读存储介质，其特征在于，其上存储有计算机程序，所述计算机 程序被执行时，以使得执行如权利要求1至7中任一项所述的方法，或者以实现如权利要求8至14中任一项所述的方法。
  29. 一种包含指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行如权利要求1至7中任一项所述的方法，或者以实现如权利要求8至14中任一项所述的方法。
  30. 一种通信系统，其特征在于，所述通信系统包括如权利要求25或27所述的通信装置和如权利要求26或27所述的通信装置。
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