WO2024078224A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2024078224A1
WO2024078224A1 PCT/CN2023/118084 CN2023118084W WO2024078224A1 WO 2024078224 A1 WO2024078224 A1 WO 2024078224A1 CN 2023118084 W CN2023118084 W CN 2023118084W WO 2024078224 A1 WO2024078224 A1 WO 2024078224A1
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Prior art keywords
network
terminal
access type
core network
access
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PCT/CN2023/118084
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English (en)
French (fr)
Inventor
李浩然
徐艺珊
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华为技术有限公司
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Publication of WO2024078224A1 publication Critical patent/WO2024078224A1/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
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the present application relates to the field of communication technology, and in particular to a communication method and device.
  • a localized service is a special network service that can be provided by an operator or a third-party service provider.
  • Localized services have flexible deployment methods, which facilitate third-party service providers to deploy specific localized services within a limited time and/or location.
  • Localized services are connected by a hosting network (a hosting network is a network that provides localized services to terminals, also known as a hosting network). When a terminal subscribes to a localized service, it can use the localized service at a specific time and/or location.
  • a terminal when a terminal meets the conditions of a localized service (such as meeting the time and/or location requirements of a localized service) and is within the coverage of a hosting network that provides the localized service, the terminal executes a re-network selection process to access the hosting network. Only after the terminal accesses the hosting network can it use the localized service provided by the hosting network. Based on the network selection mechanism, the terminal will release all sessions on the current network, perform a deregistration operation, enter an idle state, and then re-select a network. If the terminal is executing a service at this time, the currently executing service will be interrupted, affecting service continuity.
  • the embodiments of the present application provide a communication method and apparatus for reducing the impact of a network reselection operation on ongoing services of a terminal.
  • a communication method may include the following steps: when a first core network device determines that a terminal meets the conditions of a first localized service, obtaining an access type of a network currently accessed by the terminal and an access type allowed by the first network, the first network being a network used to provide the first localized service, and the access type of the network currently accessed by the terminal is a first access type; if the access type allowed by the first network is the same as the first access type, the first core network device instructs the terminal to switch from an access network corresponding to the first access type to an access network corresponding to a second access type, and the second access type is different from the first access type; after the first core network device determines that the terminal switches to the access network corresponding to the second access type, it triggers the core network to send first network selection information to the terminal.
  • the terminal when the terminal meets the conditions for localized service, if the access type allowed by the first network (i.e., the network providing the localized service, i.e., the hosting network) is the same as the first access type (i.e., the access type of the network currently accessed by the terminal (i.e., the serving network)), indicating that the two conflict, then the first core network device can instruct the terminal to switch from the access network corresponding to the first access type to the access network corresponding to an access type different from the first access type, and after the switching is completed, trigger the core network to send first network selection information to the terminal.
  • the access type allowed by the first network i.e., the network providing the localized service, i.e., the hosting network
  • the first access type i.e., the access type of the network currently accessed by the terminal (i.e., the serving network)
  • the access network since the access network has been switched before the terminal reselects the network based on the network selection information, when the terminal selects the first network for network access based on the network selection information, the access type of the first network is different from the access type of the serving network of the terminal, so the service currently executed by the terminal will not be interrupted, thereby ensuring the continuity of the service.
  • the first core network device determines that the terminal switches to the access network corresponding to the second access type, including: the first core network device sends first indication information to the terminal, and receives second indication information sent by the terminal, the first indication information is used to instruct the terminal to send the second indication information to the first core network device after completing the switching, and the second indication information is used to instruct the terminal to complete the switching; or, the first core network device determines that the terminal switches to the access network corresponding to the second access type based on the access network connection information of the terminal.
  • the above implementation method can ensure that the first core network device triggers the core network to send the first network selection information to the terminal only after determining that the terminal has switched to the access network corresponding to the second access type, thereby ensuring that the network selection information sent by the network side will be received only after the switching is completed, and then the network will be reselected according to the selection information, thereby ensuring the continuity of the terminal side service.
  • the method further includes: the first core network device acquiring the service status of the terminal; acquiring the access type allowed by the first network, Including: if the service status of the terminal indicates that the terminal has ongoing service, the first core network device obtains the access type allowed by the first network.
  • the first core network device only when the terminal currently has ongoing services, the first core network device obtains the access type allowed by the first network, and then performs subsequent operations (including instructing the terminal to switch from the access network corresponding to the first access type to the access network corresponding to the second access type when the access type allowed by the first network is the same as the first access type). Otherwise, the operation of obtaining the access type allowed by the first network will not be performed, and the subsequent operation of instructing the terminal to switch will not be performed. In other words, only when the terminal currently has ongoing services, it is necessary to instruct the terminal to switch to ensure business continuity. If the terminal currently has no ongoing services, it is not necessary to instruct the terminal to switch, thereby saving processing overhead on the network side and the terminal side, and saving network resource overhead.
  • the first core network device obtains the service status of the terminal, including: the first core network device sends a first request message to the terminal, the first request message is used to request to query the service status of the terminal; the first core network device receives a first response message sent by the terminal based on the first request message, the first response message is used to indicate the service status of the terminal.
  • the first response message includes third indication information, and the third indication information is used to indicate the service status of the terminal.
  • the first core network device obtains the access type allowed by the first network, including: the first core network device sends a second request message to the second core network device, the second request message includes the identifier of the terminal and the identifier of the first network; the first core network device receives a second response message sent by the second core network device based on the second request message, the second response message includes indication information of the access type allowed by the first network.
  • the first core network device can obtain the access type allowed by the first network from the second core network device.
  • the second request information also includes fourth indication information, and the fourth indication information is used to instruct the second core network device to return the access type allowed by the first network to the first core network device.
  • the method when the first core network device determines that the terminal meets the conditions of the first localized service, the method also includes: if the access types allowed by the first network include a second access type, and the second access type is different from the first access type, then the first core network device triggers the core network to send second network selection information to the terminal, and the second network selection information is used to indicate the second access type.
  • the terminal meets the conditions for localized service, if the access types allowed by the first network (hosting network, i.e., the network providing the localized service) include a second access type that is different from the first access type (i.e., the access type of the serving network currently accessed by the terminal), indicating that the two do not conflict or may/do not conflict, then the first core network device can trigger the core network to send network selection information to the terminal, and the network selection information is used to indicate the second access type.
  • the access types allowed by the first network hosting network, i.e., the network providing the localized service
  • the first core network device can trigger the core network to send network selection information to the terminal, and the network selection information is used to indicate the second access type.
  • the terminal after the terminal selects the hosting network based on the network selection information, it accesses the hosting network through the access network corresponding to the second access type according to the second access type, thereby ensuring that the access type of the hosting network is different from the access type of the serving network of the terminal, so that the service currently executed by the terminal will not be interrupted, thereby ensuring the continuity of the service.
  • the second network selection information includes information of the first network, so that the terminal can select the first network when performing network reselection, and thus can use the first localized service provided by the first network.
  • the second network selection information is also used to indicate at least one network recommended to the terminal for network reselection and the priority of the at least one network, the at least one network including the first network, and the first network has the highest priority, so that the terminal can give priority to the first network when performing network reselection, thereby using the first localized service provided by the first network.
  • the second network selection information includes a network selection list, wherein the network selection list includes at least one network recommended to the terminal for network reselection and information indicating an access type of the first network.
  • the first core network device triggers the core network to send second network selection information to the terminal, including: the first core network device sends the identifier of the terminal, the identifier of the first network, and indication information of the second access type to the second core network device; wherein the second core network device is used to obtain a network selection list corresponding to the terminal according to the identifier of the terminal and the identifier of the first network, and generate the second network selection information according to the network selection list and the indication information of the second access type; the first core network device receives the second network selection information sent by the second core network device; and the first core network device sends the second network selection information to the terminal.
  • the first core network device also sends fifth indication information to the second core network device, and the fifth indication information is used to instruct the second core network device to generate the second network selection information according to the indication information of the second access type and the network selection list corresponding to the terminal.
  • the first access type is a 3GPP access type
  • the second access type is a non-3GPP access type
  • the first access type is a non-3GPP access type
  • the second access type is a 3GPP access type
  • a communication method comprising: when a first core network device determines that a terminal meets conditions for a first localized service, obtaining an access type of a network currently accessed by the terminal and an access type allowed by the first network, wherein the first network is a network for providing the first localized service, and the access type of the network currently accessed by the terminal is the first access type; if the access types allowed by the first network include a second access type, and the second access type is different from the first access type, then the first core network device triggers the core network to send network selection information to the terminal, and the network selection information is used to indicate the second access type.
  • the network selection information includes information of the first network.
  • the network selection information is further used to indicate at least one network recommended to the terminal for network reselection and a priority of the at least one network, the at least one network includes the first network, and the first network has the highest priority.
  • the network selection information includes a network selection list, and the network selection list includes the at least one network recommended to the terminal for network reselection and information indicating an access type of the first network.
  • the first core network device triggers the core network to send network selection information to the terminal, including: the first core network device sends the identifier of the terminal, the identifier of the first network, and indication information of the second access type to the second core network device; wherein the second core network device is used to obtain a network selection list corresponding to the terminal according to the identifier of the terminal and the identifier of the first network, and generate the network selection information according to the network selection list and the indication information of the second access type; the first core network device receives the network selection information sent by the second core network device; and the first core network device sends the network selection information to the terminal.
  • the first core network device also sends fifth indication information to the second core network device, and the fifth indication information is used to instruct the second core network device to generate the network selection information according to the indication information of the second access type and the network selection list corresponding to the terminal.
  • the method when the first core network device determines that the terminal meets the conditions of the first localized service, the method also includes: the first core network device obtains the service status of the terminal; the obtaining of the access type allowed by the first network includes: if the service status of the terminal indicates that the terminal has a service in progress, then the first core network device obtains the access type allowed by the first network.
  • the first core network device obtains the service status of the terminal, including: the first core network device sends a first request message to the terminal, the first request message is used to request to query the service status of the terminal; the first core network device receives a first response message sent by the terminal based on the first request message, the first response message is used to indicate the service status of the terminal.
  • the first response message includes third indication information, and the third indication information is used to indicate the service status of the terminal.
  • the first core network device obtains the access type allowed by the first network, including: the first core network device sends a second request message to the second core network device, the second request message includes the identifier of the terminal and the identifier of the first network; the first core network device receives a second response message sent by the second core network device based on the second request message, the second response message includes indication information of the access type allowed by the first network.
  • the second request information also includes fourth indication information, and the fourth indication information is used to instruct the second core network device to return the access type allowed by the first network to the first core network device.
  • the first access type is a 3GPP access type
  • the second access type is a non-3GPP access type
  • the first access type is a non-3GPP access type
  • the second access type is a 3GPP access type
  • a communication method comprising: when a first core network device determines that a terminal meets conditions for a first localized service, the first core network device notifies the first core network device when indicating that there is no ongoing service for the terminal; after the first core network device receives the indication information sent by the terminal to notify the terminal that there is no ongoing service, the core network is triggered to send network selection information to the terminal.
  • the network selection information includes information of the first network, and the first network is a network that provides the first localized service.
  • the network selection information is used to indicate at least one network recommended to the terminal for network reselection and a priority of the at least one network, the at least one network includes the first network, and the first network has the highest priority.
  • a communication method comprising: when a terminal determines that a condition of a first localized service is met, obtaining the current The access type of the network previously accessed and the access type allowed by the first network, the first network is a network used to provide the first localized service, and the access type of the network currently accessed by the terminal is the first access type; if the access type allowed by the first network is the same as the first access type, the terminal switches from the access network corresponding to the first access type to the access network corresponding to the second access type, and after switching to the access network corresponding to the second access type, selects the first network for access; wherein the second access type is different from the first access type.
  • the method further includes: if the access types allowed by the first network include a second access type, and the second access type is different from the first access type, the terminal selects the first network and accesses the first network through an access network corresponding to the second access type.
  • a communication method comprising: when a terminal meets the conditions of a first localized service, determining whether the terminal currently has a business in progress; if the terminal currently has a business in progress, the terminal determines whether to switch the access type according to the user's selection, and if it is determined to switch the access type, the terminal switches from the access network corresponding to the first access type to the access network corresponding to the second access type, and after completing the switch, reselects the network according to the network selection information, and the second access type is different from the first access type.
  • the method further includes: if it is determined not to switch the access type according to the user's selection, the terminal reselects a network according to the network selection information after the currently executing service ends.
  • the method further includes: if the terminal currently has no service in progress, the terminal reselects a network according to the network selection information.
  • a communication device comprising a processing unit and a transceiver unit; the processing unit is used to: when it is determined that the terminal meets the conditions of a first localized service, obtain the access type of the network currently accessed by the terminal and the access type allowed by the first network, the first network is a network used to provide the first localized service, and the access type of the network currently accessed by the terminal is the first access type; if the access type allowed by the first network is the same as the first access type, then instruct the terminal to switch from the access network corresponding to the first access type to the access network corresponding to the second access type through the transceiver unit, and the second access type is different from the first access type; and after determining that the terminal switches to the access network corresponding to the second access type, trigger the core network to send first network selection information to the terminal.
  • a communication device comprising a processing unit and a transceiver unit; the processing unit is used to: when it is determined that the terminal meets the conditions of a first localized service, obtain the access type of the network currently accessed by the terminal and the access type allowed by the first network, the first network is a network used to provide the first localized service, and the access type of the network currently accessed by the terminal is the first access type; and, if the access type allowed by the first network includes a second access type, and the second access type is different from the first access type, triggering the core network to send network selection information to the terminal, the network selection information is used to indicate the second access type.
  • a communication system including: a first core network device and a second core network device, the first core network device is used to execute the method described in any one of the above-mentioned first aspect, and the second core network device is used to trigger the core network to send first network selection information to the terminal according to the notification of the first core network device.
  • a communication system comprising: a first core network device and a second core network device, wherein the first core network device is used to execute the method as described in any one of the above-mentioned second aspects, and the second core network device is used to trigger the core network to send second network selection information to the terminal according to the notification of the first core network device.
  • a communication device comprising: one or more processors; wherein, when instructions of one or more computer programs are executed by the one or more processors, the communication device executes any method described in the first aspect, or executes any method described in the second aspect, or executes any method described in the third aspect, or executes any method described in the fourth aspect, or executes any method described in the fifth aspect.
  • a computer-readable storage medium wherein the computer-readable storage medium includes a computer program.
  • the computing device executes any one of the methods in the first aspect, or executes any one of the methods in the second aspect, or executes any one of the methods in the third aspect, or executes any one of the methods in the fourth aspect, or executes any one of the methods in the fifth aspect.
  • a chip is provided, which is coupled to a memory and is used to read and execute program instructions stored in the memory to implement any method described in the first aspect above, or any method described in the second aspect above, or any method described in the third aspect above, or any method described in the fourth aspect above, or execute any method described in the fifth aspect above.
  • a computer program product is provided.
  • the computer executes any one of the methods in the first aspect, or executes any one of the methods in the second aspect, or executes The method described in any one of the third aspects, or the method described in any one of the fourth aspect, or the method described in any one of the fifth aspect.
  • Figure 1 is a diagram of the interoperability architecture between the hosting network and the third party and home network in the related technology
  • FIG2 is a schematic diagram of the priority order of candidate networks in the related art
  • FIG3 is a schematic diagram of a switching process of a PDU session from non-3GPP access to 3GPP access in the related art
  • FIG4 is a schematic diagram of a PDU session switching process from 3GPP access to non-3GPP access in the related art
  • FIG5 is a flow chart of the HPLMN updating the network selection list to the terminal in the related art
  • FIG6 is a schematic diagram of a process of temporary network reselection in the related art
  • FIG7 is a schematic diagram of the architecture of a 3GPP system in the related art.
  • FIG8 is a flow chart of a communication method provided in an embodiment of the present application.
  • FIG9 is a schematic diagram of an example process of the process shown in FIG8 in an embodiment of the present application.
  • FIG10 is a schematic diagram of a flow chart of another communication method provided in an embodiment of the present application.
  • FIG11 is a schematic diagram of an example process of the process shown in FIG10 in an embodiment of the present application.
  • FIG12 is a schematic diagram of a flow chart of another communication method provided in an embodiment of the present application.
  • FIG13 is a flow chart of another communication method provided in an embodiment of the present application.
  • FIG14 is a schematic diagram of a flow chart of another communication method provided in an embodiment of the present application.
  • FIG15 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.
  • FIG16 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • At least one of a, b and c can represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a, b and c.
  • a, b and c can be single or multiple.
  • the terms "first”, “second”, etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.
  • the terms “include” and “have” and any variations thereof are intended to cover non-exclusive inclusions, such as inclusion of a series of steps or units. Methods, systems, products or apparatus are not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatus.
  • Localized service is a network service provided by operators or third-party service providers. After a terminal subscribes to a localized service, it can use the localized service at a specified time and/or location.
  • the localized service is connected by a hosting network. The terminal needs to access the hosting network and meet the time and/or location requirements of the localized service to use the localized service.
  • the localized service has a flexible deployment method, which makes it easy for third-party service providers to deploy specific services within a limited time and/or location.
  • a hosting network is a network that provides services to terminals in a localized service.
  • Figure 1 illustrates an exemplary architecture of a hosting network.
  • a hosting network is a network that provides connections to obtain localized services.
  • a hosting network can be a non-public network (NPN) or a public land mobile network (PLMN).
  • NPN non-public network
  • PLMN public land mobile network
  • the network may only provide coverage in a specific geographic location and/or at a specific time (which may be related to the localized service).
  • Localized services can be provided by the hosting network operator or by a third-party service provider.
  • the terminal When users want to obtain localized services through a hosting network, they need to first connect to the hosting network and then Since localized services may be available only in a specific geographical location and/or at a specific time, or the hosting network has coverage only in a specific geographical location and/or at a specific time, the terminal needs to access the hosting network in a specific geographical location and/or at a specific time to obtain localized services.
  • one is automatic network selection, that is, the terminal automatically selects a network (such as a PLMN or NPN) according to the priority order of the available candidate networks (such as PLMN and/or NPN), and selects the best cell under the network for registration;
  • the other is manual network selection, that is, all current candidate networks are presented to the user, and the user selects a network, and selects the best cell under the network for registration.
  • Automatic network selection is mainly divided into three processes: network selection, cell selection, and location registration.
  • network selection when the terminal selects a network, it starts to select the cell belonging to this network. After searching (or scanning) for the cell belonging to the network, the terminal obtains the information of the neighboring cells from the system information broadcast. The terminal selects a cell with the best signal among all these cells to reside, and then initiates the location registration process. After the location registration is successful, the terminal successfully enters the network, that is, successfully resides in the cell.
  • the terminal selects a network with a high priority from the candidate networks in the network selection list according to their priority order.
  • Figure 2 shows an example of a network priority order.
  • the networks in the network selection list follow the following priority order:
  • Registered PLMN refers to the last registered PLMN, which has the highest priority
  • EPLMN is the equivalent PLMN of RPLMN. Since the terminal may store the cell information of RPLMN (such as frequency, scrambling code, etc.), which can help the speed of subsequent cell selection, the priority of EPLMN is lower than that of RPLMN.
  • EHPLMN is the equivalent PLMN of HPLMN, which is stored in the universal subscriber identity module (USIM) of the terminal. EHPLMN and HPLMN have the same priority. If the RPLMN is the HPLMN, the EPLMN is the same as the EHPLMN. If the RPLMN is not the HPLMN, the EPLMN is different from the EHPLMN.
  • USIM universal subscriber identity module
  • UPLMN User controlled PLMN
  • a PLMN controlled by the user that is, a PLMN that the terminal has registered when manually selecting a network.
  • the terminal s USIM stores UPLMN information.
  • Operator controlled PLMN A PLMN controlled by an operator.
  • the information of OPLMN is stored in the USIM of the terminal.
  • the information of the operator's PLMN is stored in the USIM of the terminal.
  • Visited PLMN Visited PLMN
  • FPLMN Forbidden PLMN: refers to the prohibited PLMN, the PLMN that the terminal cannot register.
  • the terminal When the terminal performs network selection, it selects a suitable network from the network selection list according to the above priority order. If the selected network has coverage at the location, the terminal accesses the network. Otherwise, the terminal continues to select a network from the network selection list according to the above priority order.
  • the terminal When the terminal performs the network selection process, it needs to be in an idle state, that is, the terminal will release all current sessions, end all services, and then reselect the network.
  • the switching process can be divided into two types: switching of PDU session from 3GPP access to non-3GPP access, or switching from non-3GPP access to 3GPP access.
  • the process of switching a PDU session from a non-3GPP connection to a 3GPP connection may include:
  • Step 301 If the terminal has not completed registration through 3GPP access, complete registration according to the process of 4.2.2.2.2 in protocol 23502;
  • Step 302 The terminal establishes a new session through 3GPP access according to the session ID of the PDU session to be switched.
  • the session ID of the PDU session to be switched please refer to the relevant content of 4.3.2.2.1 in protocol 23502;
  • Step 303 If the user plane is still activated in the non-3GPP access at this time, the resources of the non-3GPP access are released according to the process of 4.3.4.2 steps 4 to 7 and 4.3.4.2 step 7a in protocol 23502. Since releasing the session at this time is not to release the entire PDU session, no terminal-side session release is involved in this step.
  • the process of switching a PDU session from a 3GPP connection to a non-3GPP connection may include:
  • Step 401 If the terminal has not completed registration through non-3GPP access, complete registration according to the process of 4.12.2 in protocol 23502;
  • Step 402 The terminal establishes a new session through non-3GPP access according to the session ID of the PDU session to be switched. For part of it, please refer to the relevant contents of 4.12.5 in Agreement 23502;
  • Step 403 If the user plane is still activated in the 3GPP access at this time, the 3GPP resources are released according to the process of 4.3.4.2 step 3b and 4.3.4.2 step 4 to step 7a/7b in protocol 23502. Since the session is released at this time not to release the entire PDU session, no terminal-side session release is involved in this step.
  • FIG5 exemplarily shows the SOR process, which may include the following steps:
  • Step 500 If the unified data management (UDM) in the HPLMN network supports obtaining a network selection list (the network selection list is called a list of preferred PLMN/access technology combinations) from the SOR application function (SOR-AF), then the SOR-AF can send the network selection list to the HPLMN UDM (i.e., the UDM in the HPLMN).
  • the SOR-AF sends an update request (Nudm_ParameterProvision_Update request) message to the HPLM NUDM, which includes the updated network selection list.
  • Step 501 HPLMN UDM obtains an updated network selection list (which may be sent by SOR-AF or obtained from the unified data repository (UDR)).
  • HPLMN UDM notifies the access and mobility management function (AMF) of the user data update.
  • the AMF is the AMF of the network where the terminal is registered (i.e., if the terminal is registered to the HPLMN, the AMF is the AMF in the HPLMN; if the terminal is registered in the VPLMN, the AMF is the AMF in the VPLMN).
  • HPLMN UDM sends a notification request (Nudm_SDM_Notification request) message to the AMF, which includes the updated network selection list that needs to be sent to the terminal.
  • the updated network selection list is included in the SOR information (steering of roaming information).
  • Step 502 AMF sends a downlink non-access-stratum (NAS) message to the terminal (user equipment, UE, also known as user equipment), and the message includes the information obtained from the UDM. That is, AMF transparently transmits the information obtained from the UDM to the terminal. If the UDM sends an updated network selection list to the AMF, the downlink NAS message includes the network selection list. If the UDM sends a SOR message to the AMF, and the SOR message includes the updated network selection list, the downlink NAS message sent by the AMF to the terminal includes the SOR information.
  • NAS non-access-stratum
  • Step 503 After the terminal receives the SOR information (or network selection list), the terminal performs a security check to confirm that the information is provided by the HPLMN. If the security check is successful, the terminal uploads the information to the USIM or replaces the OPLMN selection list stored in the terminal, which is called the Operator Controlled PLMN Selector with Access Technology list.
  • Step 504 If the UDM requests the terminal to feedback a response message, the terminal includes the response message in the uplink NAS message.
  • the response message is included in the SOR transparent container in the uplink NAS message.
  • Step 505 AMF sends the information included in the SOR transparent transmission container (Nudm_SDM_Info message) to UDM.
  • This information is the information included in the SOR transparent transmission container in the uplink NAS message sent by the terminal.
  • the SOR transparent transmission container includes the response message sent by the terminal.
  • UDM verifies that the response message is sent by the terminal.
  • Step 506 If the updated network selection list is provided by the SOR-AF, the HPLMN UDM may send a message to the SOR-AF indicating that the network selection list has been successfully transmitted to the terminal.
  • the HPLMN UDM sends an Nsoraf_SoR_Info message to the SOR-AF, which includes information on successful transmission.
  • V Temporary network reselection
  • FIG6 exemplarily shows a TNR process, which may include the following steps:
  • Step 600 The terminal has registered with the VPLMN or HPLMN through the AMF.
  • Step 601 The terminal sends TNR information via a NAS message to request authentication from the network.
  • the terminal sends the information via a registration request.
  • the TNR information includes:
  • Step 602 AMF updates the terminal context to UDM according to the TNR information provided by the terminal, including the TNR information.
  • Steps 603a to 603d Based on the TNR information received from the AMF, the UDM requests the SOR-AF to authenticate the network requested in the TNR information for the terminal.
  • the SOR-AF updates the SOR information to the UDM and protects the SOR information through the authentication server function (AUSF).
  • AUSF authentication server function
  • Steps 604 to 610 Update the SOR information of the terminal according to the SOR process shown in FIG. 5 .
  • Step 611 When the terminal meets the localized service conditions, the network selection is performed according to the network selection list provided by the SOR information. When a higher priority network appears, the terminal performs network reselection.
  • FIG7 shows a schematic diagram of the architecture of a 3GPP system, which includes a terminal, a (radio) access network ((R)AN) and a core network device.
  • the devices related to the embodiment of the present application may include:
  • the terminal device of the embodiment of the present application can be a passive terminal device or a semi-passive terminal device.
  • the terminal device of the embodiment of the present application can also be called a passive terminal device.
  • the terminal device of the embodiment of the present application can be, for example, a tag, a user equipment (UE), etc.
  • the terminal device can be widely used in various scenarios, for example, the Internet of Things (IOT), device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), the Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.
  • (R)AN equipment used to provide network access functions for authorized terminal devices in a specific area, and can use transmission tunnels of different qualities according to the level of the terminal equipment, business requirements, etc.
  • the access network equipment can be a base station, an evolved nodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a 5G mobile communication system, a next generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a Wi-Fi system, etc.; it can also be a module or unit that completes part of the functions of a base station, for example, it can be a central unit (CU) or a distributed unit (DU).
  • the CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part or all of the physical layer.
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part or all of the physical layer.
  • the access network device may be a macro base station, a micro base station or an indoor station, a relay node or a donor node, etc.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the access network device.
  • the access network device hereinafter is taken as an example of a base station.
  • Base stations and terminal devices can be fixed or mobile.
  • Base stations and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons, and artificial satellites in the air.
  • the embodiments of this application do not limit the application scenarios of base stations and terminal devices.
  • Data network A network used to provide data transmission.
  • the data network can still be a DN, or it can have other names, which are not limited in this application.
  • a terminal device accesses the network, it can establish a PDU session and access the DN through the PDU session, and can interact with application functions deployed in the DN (such as application servers).
  • the access and mobility management function (AMF) entity (also referred to as the access and mobility management function, access and mobility management device, access and mobility management network element, access management device, mobility management device) is a core network device, mainly used for mobility management and access management, etc., and can be used to implement other functions of the mobility management entity (MME) function except session management, such as lawful interception, or access authorization (or authentication), user equipment registration, mobility management, tracking area update process, reachability detection, session management network element selection, mobile state transition management and other functions.
  • MME mobility management entity
  • the access and mobility management network element can be an access and mobility management function (AMF) network element.
  • AMF access and mobility management function
  • the access and mobility management network element can still be an AMF network element, or have other names, which are not limited in this application.
  • the AMF can provide Namf services.
  • Unified data management UDM
  • UDR unified data repository
  • UDM or UDR may refer to a user database. It can exist as a single logical repository for storing user data.
  • UDM is used to process terminal device identification, access authentication, registration, and mobility management.
  • the data management network element may be a UDM network element or a unified data management device.
  • unified data management may still be a UDM network element, or it may have other names, which are not limited in this application.
  • the unified data management device may be a core network device.
  • Application function can interact with the 5G system through AF to access network open functions or interact with the policy framework for policy control, etc.
  • AUSF Authentication server function
  • FIG7 also shows the interaction relationship between various network functional entities and the corresponding interfaces.
  • the above-mentioned device or function can be a network element in a hardware device, a software function running on dedicated hardware, or a virtualized function instantiated on a platform (e.g., a cloud platform).
  • the above-mentioned device or function can be divided into one or more services, and further, there may be services that exist independently of the network function.
  • an instance of the above-mentioned function, or an instance of a service included in the above-mentioned function, or an instance of a service that exists independently of the network function can be referred to as a service instance.
  • the embodiments of the present application are not limited to the above system architecture, but can also be applied to other future communication systems, such as 6G system architecture, etc.
  • the names of the various devices used in the embodiments of the present application may keep the same functions in future communication systems, but the names may change.
  • the terminal In order to obtain localized services, the terminal needs to access the hosting network.
  • the terminal can perform network reselection.
  • the terminal if the terminal is executing some services, based on the network selection mechanism, the terminal will release all sessions in the current network, perform deregistration, enter the idle state, and then reselect the network, which will cause the currently executing services to be interrupted, affecting business continuity. Therefore, how to reduce or avoid the impact of reselecting the network on the currently ongoing services is a problem that needs to be solved.
  • the embodiments of the present application provide a communication method and related devices to reduce the impact of the re-network selection operation on the ongoing services of the terminal.
  • the core network can be accessed through different types of access networks, for example, the core network can be accessed through a non-3GPP access network (for example, accessed through Wi-Fi), or through a 3GPP access network (for example, accessed through a cellular network, such as a base station).
  • the access type is also different. For example, for access through 3GPP, the corresponding access type is 3GPP access, and for access through non-3GPP, the corresponding access type is non-3GPP access.
  • more access types may be included, and the embodiments of the present application are not limited to this.
  • the network side dynamically sends the network selection information of the hosting network to the terminal.
  • the network side obtains the access type allowed by the hosting network and identifies the access type of the terminal's current access to the serving network.
  • the network side instructs the terminal to switch the access type, that is, to switch from the current access network to another access network to access the serving network, so that when the terminal reselects the network and selects the hosting network for access, the access type of accessing the hosting network does not conflict with the access type of accessing the serving network, thereby ensuring the business continuity of the terminal.
  • the "switching" in this article can be understood as the switching of access networks, such as switching from an access network corresponding to one access type to an access network corresponding to another access type.
  • the "switching” includes switching from the access network corresponding to 3GPP access to the access network corresponding to non-3GPP access, or from the access network corresponding to non-3GPP access to the access network corresponding to 3GPP access. Since the access type has changed through the above-mentioned switching operation, in some embodiments of the present application, the above-mentioned "switching" is simply referred to as the switching of access type.
  • the above-mentioned switching may include switching from 3GPP access to non-3GPP access, or switching from non-3GPP access to 3GPP access.
  • This process can be applied to the system architecture shown in Figure 7.
  • the first core network device in the process can be AMF
  • the second core network device can be UDM.
  • This process can also be applied to an evolved system architecture or other system architectures, which is not limited in this embodiment of the present application.
  • the first core network device determines that the terminal meets the conditions of the first localized service.
  • the first localized service may be any localized service.
  • the embodiment of the present application does not limit the type of the first localized service.
  • the condition that the terminal meets the first localized service is that the terminal enters the service area of the first localized service
  • the first core network device determines that the terminal moves into the service area of the first localized service
  • the first core network device determines that the terminal meets the condition of the first localized service. For example, the terminal changes the tracking area (TA) through mobility registration, and the new TA is within the service area of the first localized service. At this time, the first core network device determines that the terminal meets the condition of the first localized service.
  • TA tracking area
  • the condition for the terminal to meet the first localized service is that the service start time is reached, then when the first core network device determines that the time is reached, the first core network device determines that the terminal meets the condition for the first localized service.
  • the condition for the terminal to meet the first localized service is that the terminal enters the service area of the first localized service and reaches the service start time
  • the first core network device determines that the terminal moves into the service area of the first localized service and currently reaches the service start time, the first core network device determines that the terminal meets the condition for the first localized service.
  • the first core network device obtains the access type of the network currently accessed by the terminal and the access type allowed by the first network.
  • the network currently accessed by the terminal is also referred to as the current serving network of the terminal.
  • the serving network may be HPLMN.
  • the access type of the network currently accessed by the terminal is referred to as the first access type.
  • the first access type may be 3GPP access or non-3GPP access.
  • the first network is a network for providing a first localized service. Based on the hosting network architecture shown in FIG1 , it can be understood that the first network is a hosting network that provides a first localized service.
  • the access type allowed by the first network is the access type that the first network can use, or what access type can be used to access the first network.
  • the access type allowed by the first network may include only one access type, or may include multiple access types.
  • the access types allowed by the first network may be the same or different.
  • the first core network device may obtain the access type of the network to which the terminal is currently accessed based on the context of the terminal stored in the first core network device.
  • the first core network device can obtain the access type allowed by the first network from the second core network device.
  • the first core network device sends a request message to the second core network device (to facilitate distinction from other request messages hereinafter, the request message is referred to as the second request message), the second request message includes the identifier of the terminal and the identifier of the first network; the second core network device sends a second response message to the first core network device based on the second request message, the second response message includes indication information of the access type allowed by the first network.
  • the access type allowed by the first network refers to the access type for the terminal.
  • the indication information of the access type allowed by the first network may be an identifier of the access type (different access types may be distinguished using different identifiers), or may be a coded value used to indicate one or more access types.
  • the coded value may be 3-bit information, and when the coded value is equal to 0, it indicates 3GPP access, when the coded value is equal to 1, it indicates non-3GPP access, and when the coded value is equal to 2, it indicates 3GPP access and non-3GPP access.
  • the coded value may be 3-bit information, and when the coded value is equal to 0, it indicates 3GPP access, when the coded value is equal to 1, it indicates non-3GPP access, and when the coded value is equal to 2, it indicates 3GPP access and non-3GPP access.
  • the second request information may also include indication information (to facilitate distinguishing it from other indication information below, the indication information is referred to as the fourth indication information here), and the fourth indication information is used to instruct the second core network device to return the access type allowed by the first network to the first core network device.
  • the second core network device can query the access type allowed by the first network based on the fourth indication information and return the query result to the first core network device.
  • the first core network device determines that the access type allowed by the first network is the same as the first access type, it instructs the terminal to switch from the access network corresponding to the first access type (i.e., the current access network) to the access network corresponding to the second access type according to the second access type, and the second access type is different from the first access type.
  • the first access type i.e., the current access network
  • the case where the access type allowed by the first network is the same as the first access type includes: the first network allows one access type, and the access type is the same as the first access type.
  • the access type allowed by the first network is 3GPP access, and the first access type is also 3GPP access, or the access type allowed by the first network is non-3GPP access, and the first access type is also non-3GPP access.
  • the access type allowed by the first network is the same as the first access type, it indicates that the access type allowed by the first network conflicts with the access type of the network currently accessed by the terminal. In this case, when the terminal reselects the network, the ongoing service of the terminal may be interrupted.
  • the first core network device instructs the terminal to switch from the current access network to the access network corresponding to the second access type, and the second access type is different from the first access type, so that the terminal switches from the access network corresponding to the first access type (i.e., the current access network) to the access network corresponding to the second access type, that is, accesses the above-mentioned serving network through the access network corresponding to the second access type.
  • the first core network device instructs the terminal to switch to a non-3GPP access network. If the first access type is a non-3GPP access network, the first core network device instructs the terminal to switch to a 3GPP access network.
  • the process of switching the terminal from a non-3GPP access to a 3GPP access can refer to the process shown in Figure 3. Since the process does not involve the release of the PDU session on the terminal side, the continuity of the current service of the terminal can be guaranteed. In a possible implementation, the process of switching the terminal from 3GPP access to non-3GPP access can refer to the process shown in Figure 4. Since this process does not involve the release of the PDU session on the terminal side, the continuity of the terminal's current business can be guaranteed.
  • the first core network device may send a notification to the terminal, the notification being used to instruct the terminal to switch from the access network corresponding to the current first access type to the access network corresponding to the second access type.
  • the notification may also include indication information of the second access type.
  • the first network selection information includes information about the first network, such as an identifier of the first network, so that the terminal can select the first network (i.e., the hosting network of the first localized service) for access according to the first network selection information, thereby adapting to the localized service provided by the first network.
  • the first network selection information is also used to indicate at least one network recommended to the terminal for network reselection and the priority of the at least one network, wherein the at least one network includes a first network, and the first network has the highest priority, so that the terminal can preferentially select the first network (i.e., the hosting network of the first localized service) for access according to the first network selection information, so as to use the localized service provided by the first network.
  • the first network selection information is a network selection list, and the network selection list includes one or more networks recommended to the terminal for network reselection, including the first network with the highest priority.
  • the priority order of other networks can be set according to the priority order shown in FIG. 2.
  • the first core network device can determine whether the terminal switches to the access network corresponding to the second access type based on the access network connection information of the terminal, that is, determine whether the terminal completes the access network switching.
  • the first core network device can be used for mobility management and access management, so in the process of the terminal switching the access network, the first core network device can obtain the access network connection information of the terminal (such as information on session establishment through the new access network, information on the release of access resources of the original access network, etc.), so it can be determined based on this information whether the terminal completes the access network switching.
  • the first core network device (such as AMF) can obtain relevant information about the new session established by the terminal through 3GPP access, and can also obtain relevant information about the terminal releasing non-3GPP access resources, so that it can be determined based on this information whether the terminal completes the switching process from non-3GPP access to 3GPP access.
  • the first core network device may determine whether the terminal has completed the handover in the following manner: the first core network device sends first indication information to the terminal, and receives second indication information sent by the terminal.
  • the first indication information is used to indicate that the terminal sends the second indication information to the first core network device after completing the handover, and the second indication information is used to indicate that the terminal has completed the handover.
  • the first core network device may include the first indication information in a message used to instruct the terminal to switch the access network and send it to the terminal, or may use a separate message to send the first indication information, which is not limited in this embodiment of the present application.
  • the first core network device can trigger the core network to send the first network selection information to the terminal in the following manner: after the first core network device determines that the terminal switches to the access network corresponding to the second access type, the first core network device sends a notification to the second core network device to trigger the second core network device to start the SOR process, so that the first network selection information can be obtained from the second core network device. After the first core network device obtains the first network selection information, it sends it to the terminal.
  • the specific implementation method of the SOR process can refer to the process shown in Figure 5 or Figure 6.
  • the following steps may also be performed: S802: The first core network device obtains the service status of the terminal. In S803, if the first core network determines that the terminal has an ongoing service based on the service status of the terminal, the access type allowed by the first network is obtained.
  • the service state of the terminal may include a first state and a second state, wherein the first state indicates that the terminal is currently having services in progress, and the second state indicates that the terminal is currently having no services in progress.
  • the first state may be further divided according to the type of services being performed by the terminal, and this embodiment of the application does not limit this.
  • the first core network device may obtain the service status of the terminal in the following manner: the first core network device sends a first request message to the terminal, the first request message is used to request to query the service status of the terminal; the terminal sends a first response message based on the first request message, the first response message is used to indicate the service status of the terminal.
  • the first response message may include third indication information, the third indication information is used to indicate the service status of the terminal.
  • the first core network device if the first core network device obtains the service status of the terminal and determines that the terminal currently has no service in progress based on the service status of the terminal, the first core network device skips S803 (i.e., does not execute S803), but directly triggers the core network device to send the first network selection information to the terminal. In other words, only when the terminal currently has a service in progress will the first core network device instruct the terminal to switch the access network to ensure the continuity of the current service. When the terminal currently has no service in progress, there is no need to instruct the terminal to switch the access network, thereby saving the overhead on the terminal side and the network side, and saving the signaling overhead.
  • the timing relationship of each step is only an example, and the embodiment of the present application does not limit the timing relationship between each step.
  • the step of the first core network device obtaining the access type of the network currently accessed by the terminal can also be before S801.
  • the terminal when the terminal meets the conditions for localized service, if the access type allowed by the first network (i.e., the network providing the localized service, i.e., the hosting network) is the same as the first access type (i.e., the access type of the serving network currently accessed by the terminal), indicating that the two conflict, then the first core network device can instruct the terminal to switch from the access network corresponding to the first access type to the access network corresponding to an access type different from the first access type, and after the switching is completed, trigger the core network to send the first network selection information to the terminal.
  • the access type allowed by the first network i.e., the network providing the localized service, i.e., the hosting network
  • the first access type i.e., the access type of the serving network currently accessed by the terminal
  • the access type of the hosting network is different from the access type of the serving network of the terminal, so the service currently executed by the terminal will not be interrupted, thereby ensuring the continuity of the service.
  • FIG. 9 An example of the process shown in Figure 8 can be shown in Figure 9.
  • the specific implementation of each step in Figure 9 can refer to the relevant content in the process shown in Figure 8.
  • the process may include the following steps:
  • Step 901 AMF determines that the UE meets the conditions for the first localized service.
  • Step 902 When the UE meets the conditions for the first localized service, the AMF sends a first request message to the UE, which is used to initiate an inquiry to the UE to request the service status of the UE so as to determine whether the UE is currently executing any service.
  • the AMF sends a NAS message to the UE, including the first request information.
  • Step 903 The UE sends a first response message to the AMF to feedback the service status of the UE so that the AMF can determine whether the UE is currently carrying out any service.
  • the UE sends a NAS message to the AMF, which includes the first response information.
  • the first response information includes indication information of the service status of the UE, which is used to indicate whether the UE currently has any service in progress.
  • Step 904 If the UE is currently conducting a service, the AMF requests the UDM for the access type allowed by the hosting network (i.e., the network providing the first localized service) that the UE wants to access.
  • the hosting network i.e., the network providing the first localized service
  • AMF sends a Nudm_SDM_Get request message to UDM, which includes the UE identifier, the hosting network identifier, and further includes indication information for instructing UDM to return the access type of the hosting network that the UE is allowed to use (i.e., the fourth indication information in the process shown in FIG8 ).
  • Step 905 UDM feeds back to AMF the access types allowed by the hosting network.
  • UDM sends a Nudm_SDM_Get response message to AMF, which includes the identifier of the hosting network, the identifier of the UE, and an indication of the access type allowed by the hosting network.
  • Step 906 AMF compares the access type allowed by the hosting network and the access type of the UE's current access to the serving network (called the first access type) to determine whether there is a conflict between the two. If there is a conflict, the UE is instructed to switch the access type, that is, switch to another access network whose corresponding access type is different from the first access type.
  • the AMF instructs the UE to switch the current first access type (3GPP access) to non-3GPP access. If the first access type is non-3GPP access and the access type allowed by the hosting network is also non-3GPP access, the AMF instructs the UE to switch the current first access type (non-3GPP access) to 3GPP access.
  • the AMF sends a NAS message to the UE, where the message includes indication information for instructing the UE to switch the access network.
  • Step 907 The UE performs an access type switching process.
  • Step 908 AMF notifies UDM, triggering UDM to start the SOR process.
  • AMF sends a Namf_EventExposure_Notify message to UDM, which contains the UE identifier, the hosting network identifier, and indication information for instructing UDM to trigger the SOR process.
  • Step 909 UDM requests SOR information from SOR-AF.
  • the UDM sends a Nsoraf_SoR_Getrequest message to the SOR-AF, where the message is used to request the SOR-AF to send SOR information.
  • Step 910 The SOR-AF returns the SOR information to the UDM.
  • the SOR-AF sends an Nsoraf_SoR_Getresponse message to the UDM, where the message is used to respond to the UDM's request and send the SOR information to the UDM.
  • Step 911 UDM sends the SOR information to AMF.
  • the UDM sends a Nudm_SDM_Notification message to the AMF, the message including the first network selection information.
  • the first network selection information may include a network selection list, and when the UE uses the network selection list to select a network, it may select a hosting network for access.
  • Step 912 AMF sends a SOR message to the UE.
  • the AMF sends the SOR information to the UE via a NAS message.
  • Step 913 After receiving the SOR information, the UE reselects the network based on the network selection list according to the SOR information sent by the AMF, thereby accessing the hosting network.
  • the network side when the network side dynamically sends the network selection information, it considers whether the UE is currently executing a service and the access type allowed by the hosting network. If the access type of the hosting network conflicts with the serving network, the access type of the serving network is switched so that the hosting network can use a different access type to access the network, which will not affect the current service.
  • the network side dynamically sends the network selection information of the hosting network to the terminal.
  • the network side obtains the access type allowed by the hosting network and identifies the access type of the terminal's current access to the serving network.
  • the terminal is instructed to use an access type different from the access type currently accessing the serving network to access the hosting network, so that when the terminal reselects the network and selects the hosting network for access, the access type of accessing the hosting network does not conflict with the access type of accessing the serving network, thereby ensuring the business continuity of the terminal.
  • This process can be applied to the system architecture shown in Figure 7.
  • the first core network device in the process can be AMF
  • the second core network device can be UDM.
  • This process can also be applied to an evolved system architecture or other system architectures, which is not limited in this embodiment of the present application.
  • a first core network device determines that a terminal meets conditions for a first localized service.
  • the first core network device obtains the access type of the network currently accessed by the terminal and the access type allowed by the first network.
  • the first core network device triggers the core network to send second network selection information to the terminal, where the second network selection information is used to indicate the second access type.
  • the first access type and the second access type are different.
  • the second access type indicated by the second network selection information is applied to the first network, that is, the terminal accesses the first network through the access network corresponding to the second access type according to the second network selection information.
  • the first network allows only one access type, which is different from the first access type, that is, the access type allowed by the first network is the second access type mentioned above.
  • This situation indicates that the access type allowed by the first network does not conflict with the access type of the terminal's current access service network.
  • the access type allowed by the first network is 3GPP access, and the first access type is non-3GPP access; for another example, the access type allowed by the first network is non-3GPP access, and the first access type is 3GPP access.
  • the first network allows multiple access types, including a second access type that is different from the first access type.
  • This situation indicates that the access type allowed by the first network may conflict with the access type of the terminal's current access service network, or may not conflict.
  • the access types allowed by the first network include 3GPP access and non-3GPP access, and the first access type is non-3GPP access.
  • the second network selection information sent by the first core network device to the terminal indicates a second access type that is different from the first access type, so that the access type of the terminal accessing the first network does not conflict with the access type of the terminal accessing the serving network, thereby ensuring the service continuity of the terminal.
  • the second network selection information includes information about the first network, such as an identifier of the first network, so that the terminal can select the first network (i.e., the hosting network of the first localized service) for access according to the second network selection information, thereby adapting to the localized service provided by the first network.
  • the second network selection information is also used to indicate at least one network recommended to the terminal for network reselection and the priority of the at least one network, wherein the at least one network includes a first network, and the first network has the highest priority, so that the terminal can preferentially select the first network (i.e., the hosting network of the first localized service) for access according to the second network selection information, so as to use the localized service provided by the first network.
  • the priority order of other networks can be set according to the priority order shown in FIG. 2.
  • the second network selection information is a network selection list, the network selection list including at least one network recommended to the terminal for network reselection and the priority of the at least one network, the at least one network including a first network with the highest priority, and a network for indicating the first network with the highest priority.
  • the information is used to indicate the second access type, that is, the information is used to indicate that the access type of the first network is the second access type.
  • Table 1 an example of the network selection list is shown in Table 1.
  • the order of priority ID from high to low is: 1, 2, 3...
  • the first core network device may trigger the core network to send the second network selection information to the terminal in the following manner: the first core network device sends the terminal identifier, the first network identifier, and indication information of the second access type to the second core network device; the second core network device obtains the network selection list corresponding to the terminal according to the terminal identifier and the first network identifier, for example, sends the terminal identifier and the first network identifier to the SOR-AF, and receives the corresponding network selection list from the SOR-AF, the network selection list includes the identifier of the first network, and the first network has the highest priority; the second core network device generates the second network selection information according to the network selection list and the indication information of the second access type, for example, the second core network device may add the indication information of the second access type to the network selection list to obtain the second network selection information, an example of the second network selection information can be seen in Table 1; the second core network device sends the second network selection information to the first core network device; the first
  • the first core network device also sends fifth indication information to the second core network device, and the fifth indication information is used to instruct the second core network device to generate second network selection information based on the indication information of the second access type and the network selection list corresponding to the terminal, such as instructing the second core network device to add the indication information of the second access type to the network selection list of the terminal.
  • the first core network device sends a notification to the second core network device to trigger the second core network device to start the SOR process, so that the second network selection information can be obtained from the second core network device. After the first core network device obtains the second network selection information, it sends it to the terminal.
  • the specific implementation method of the SOR process can refer to the process shown in Figure 5 or Figure 6.
  • the following steps may also be performed: S1002: The first core network device obtains the service status of the terminal. In S1003, if the first core network determines that the terminal has an ongoing service based on the service status of the terminal, the access type allowed by the first network is obtained.
  • the implementation method of the first core network device obtaining the service status of the terminal can refer to the relevant content in the process shown in Figure 8.
  • the first core network device if the first core network device obtains the service status of the terminal and determines that the terminal currently has no service in progress according to the service status of the terminal, the first core network device triggers the core network device to send third network selection information to the terminal.
  • the third network selection information includes information of the first network, such as an identifier of the first network, so that the terminal can select the first network (i.e., the hosting network of the first localized service) for access according to the second network selection information, thereby adapting to the localized service provided by the first network.
  • the third network selection information is also used to indicate at least one network recommended to the terminal for network reselection and the priority of the at least one network, wherein the at least one network includes the first network, and the first network has the highest priority, so that the terminal can preferentially select the first network (i.e., the hosting network of the first localized service) for access according to the second network selection information, so as to use the localized service provided by the first network.
  • the priority order of other networks can be set according to the priority order shown in FIG. 2.
  • the timing relationship of each step is only an example, and the embodiment of the present application does not limit the timing relationship between each step.
  • the step of the first core network device obtaining the access type of the network currently accessed by the terminal can also be before S1001.
  • the terminal meets the conditions for localized service, if the access types allowed by the first network (hosting network, i.e., the network providing the localized service) include a second access type that is different from the first access type (i.e., the access type of the serving network currently accessed by the terminal), indicating that the two do not conflict or may/do not conflict, then the first core network device can trigger the core network to send network selection information to the terminal, and the network selection information is used to indicate the second access type.
  • the access types allowed by the first network hosting network, i.e., the network providing the localized service
  • the first core network device can trigger the core network to send network selection information to the terminal, and the network selection information is used to indicate the second access type.
  • the terminal after the terminal selects the hosting network based on the network selection information, it accesses the hosting network through the access network corresponding to the second access type according to the second access type, thereby ensuring that the access type of the hosting network is different from the access type of the serving network of the terminal, so that the service currently executed by the terminal will not be interrupted, thereby ensuring the continuity of the service.
  • FIG. 11 An example of the process shown in Figure 10 can be shown in Figure 11.
  • the specific implementation of each step in Figure 11 can refer to the relevant content in the process shown in Figure 10.
  • the process may include the following steps:
  • Step 1101 AMF determines that the UE meets the conditions for the first localized service.
  • Step 1102 When the UE meets the conditions for the first localized service, the AMF sends a first request message to the UE, which is used to initiate an inquiry to the UE to request the service status of the UE so as to determine whether the UE is currently executing any service.
  • the AMF sends a NAS message to the UE, including the first request information.
  • Step 1103 The UE sends a first response message to the AMF to feedback the service status of the UE so that the AMF can determine whether the UE is currently carrying out any service.
  • the UE sends a NAS message to the AMF, which includes the first response information.
  • the first response information includes indication information of the service status of the UE, which is used to indicate whether the UE currently has any service in progress.
  • Step 1104 If the UE is currently conducting a service, the AMF requests the UDM for the access type allowed by the hosting network (i.e., the network providing the first localized service) that the UE wants to access.
  • the hosting network i.e., the network providing the first localized service
  • AMF sends a Nudm_SDM_Get request message to UDM, which includes the UE identifier, the hosting network identifier, and further includes indication information for instructing UDM to return the access type of the hosting network that the UE is allowed to use.
  • Step 1105 UDM feeds back to AMF the access types allowed by the hosting network.
  • UDM sends a Nudm_SDM_Get response message to AMF, which includes the identifier of the hosting network, the identifier of the UE, and an indication of the access type allowed by the hosting network.
  • Step 1106 AMF compares the access type allowed by the hosting network and the access type of the UE's current access to the serving network (called the first access type) to determine whether there is a conflict between the two. If there is no conflict, AMF notifies UDM to start the SOR process.
  • the first access type is 3GPP access and the access type allowed by the hosting network is non-3GPP access, there is no conflict between the two, and AMF notifies UDM to start the SOR process. If the first access type is non-3GPP access and the access type allowed by the hosting network is 3GPP access, there is no conflict between the two, and AMF notifies UDM to start the SOR process.
  • AMF sends a Namf_EventExposure_Notify message to UDM, which includes the UE identifier, the hosting network identifier, and may also include indication information of the second access type (the second access type is different from the first access type mentioned above). Further, it may also include indication information for instructing UDM to trigger the SOR process.
  • Step 1107 UDM requests SOR information from SOR-AF.
  • the UDM sends a Nsoraf_SoR_Getrequest message to the SOR-AF, where the message is used to request the SOR-AF to send SOR information.
  • Step 1108 The SOR-AF returns the SOR information to the UDM.
  • the SOR-AF sends an Nsoraf_SoR_Getresponse message to the UDM, where the message is used to respond to the UDM's request and send the SOR information to the UDM.
  • Step 1109 UDM sends the SOR information to AMF.
  • the UDM sends a Nudm_SDM_Notification message to the AMF, which includes the second network selection information.
  • the second network selection information may include a network selection list, which includes indication information of the second access type.
  • Step 1110 AMF sends a SOR message to the UE.
  • the AMF sends the SOR information to the UE via a NAS message.
  • Step 1111 After receiving the SOR information, the UE reselects the network based on the network selection list according to the SOR information sent by the AMF, thereby selecting the hosting network and accessing the network according to the second access type.
  • the network side when the network side dynamically sends the network selection information, it considers whether the UE is currently executing a service and the access type allowed by the hosting network. When the hosting network can access the network using an access type different from the current serving network, it will not affect the current service.
  • the process shown in FIG8 and the process shown in FIG10 can be used in combination.
  • the first core network device determines that the terminal meets the conditions of the first localized service, if it is determined that the access type allowed by the first network is the same as the first access type, then the relevant steps are performed with reference to the process shown in FIG8; if the access type allowed by the first network includes the second access type, then the relevant steps are performed with reference to the process shown in FIG10.
  • Some other embodiments of the present application also provide a communication method, in which, in view of the dynamic delivery of network selection information, the delivery conditions of the network selection information are enhanced to avoid interruption of the current service of the terminal.
  • the core network is triggered to send network selection information to the terminal, so that the terminal can select the hosting network for network access.
  • the first core network device when the first core network device determines that the terminal meets the conditions of the first localized service, it notifies the first core network device when indicating that the terminal has no ongoing service; after the first core network device receives the indication information sent by the terminal to notify the terminal that there is no ongoing service, it triggers the core network to send network selection information to the terminal.
  • the network selection information includes information of a first network, where the first network is a network providing the first localized service.
  • the network selection information is used to indicate at least one network recommended to the terminal for network reselection and a priority of the at least one network, wherein the at least one network includes a first network (ie, a network providing the first localized service), and the first network has the highest priority.
  • a first network ie, a network providing the first localized service
  • This process can be applied to the system architecture shown in Figure 7.
  • the first core network device in the process can be AMF
  • the second core network device can be UDM.
  • This process can also be applied to an evolved system architecture or other system architectures, which is not limited in this embodiment of the present application.
  • FIG12 exemplarily shows a possible implementation method of the above process.
  • the network side dynamically sends the network selection information of the hosting network to the terminal.
  • the network side triggers the core network to send the network selection information to the terminal only when it determines that the terminal has no business.
  • the process may include the following steps:
  • Step 1201 AMF determines that the UE meets the conditions for localized services.
  • Step 1202 When the UE meets the conditions for localized service, the AMF sends an indication message to the UE, which is used to instruct the UE to provide feedback to the AMF after all current services are completed.
  • the UE can wait until all the ongoing services are completed and then provide feedback to the AMF; if the UE is currently not carrying out a service, it can provide feedback to the AMF immediately after receiving the indication information.
  • the indication information may be sent to the UE via a downlink NAS message.
  • the AMF may include the indication information in the registration acceptance message.
  • Step 1203 After terminating all current services according to the received indication information, the UE provides feedback to the AMF to notify the AMF that the UE has no current services in progress.
  • the UE may feed back the information to the AMF via a NAS message.
  • Step 1204 AMF sends a notification to UDM, indicating that the current UE has met the conditions for reselecting the network, triggering UDM to start the SOR process.
  • AMF sends a Namf_EventExposure_Notify message to UDM, which contains the information that the UE currently meets the localization service, the identifier of the localization service, and the identifier of the hosting network (the hosting network is the network that provides the localization service).
  • Step 1205 UDM requests SOR information from SOR-AF.
  • UDM sends a Nsoraf_SoR_Get request message to the SOR-AF, which is used to request the SOR-AF to send SOR information.
  • Step 1206 The SOR-AF returns the SOR information to the UDM.
  • the SOR-AF sends an Nsoraf_SoR_Get response message to the UDM, which is used to respond to the UDM's request and send SOR information to the UDM.
  • Step 1207 UDM sends the SOR information to AMF.
  • UDM sends a Nudm_SDM_Notification message to AMF.
  • the message includes a network selection list.
  • the network selection list includes the identifier of the hosting network, and the hosting network has the highest priority.
  • the UE selects a network according to the network selection list, it can select the hosting network for access.
  • Step 1208 AMF sends the SOR message to the UE.
  • the AMF sends the SOR information to the UE via a NAS message, which includes the above-mentioned network selection list.
  • Step 1209 After receiving the SOR information, the UE reselects the network according to the network selection list based on the SOR message sent by the AMF, thereby accessing the hosting network.
  • the conditions for dynamically sending network selection information on the network side have been strengthened, and the original need to meet the local service correspondence
  • the condition that the UE is not currently executing any service is added.
  • the network side will not immediately send the network selection information of the hosting network, but will wait until all the current services of the UE are completed before sending the network selection information.
  • the additional conditions restrict the UE from reselecting the network when there is a service being executed, thereby avoiding the impact on the current service of the UE.
  • Some embodiments of the present application also provide a communication method, in which, in the case where network selection information is preconfigured on a terminal, the terminal itself can determine whether there is currently a service in progress. If there is a service in progress, the terminal obtains the user's choice by interacting with the user, and determines whether to start network reselection according to the user's choice. If the user chooses to start network reselection, the terminal starts network reselection after waiting for all the services in use to end, so as to reselect the network according to the preconfigured network selection list.
  • the network selection information preconfigured on the terminal may include, but is not limited to, an identifier of a localized service, a condition of a localized service, and a network selection list for selecting a hosting network.
  • the condition of a localized service may be a condition based on a service location required by the localized service, or a condition based on a service start time of the localized service, or a condition based on a service location and a service start time.
  • the network selection list includes an identifier of a hosting network, and optionally, a hosting network has the highest priority.
  • Figure 13 exemplarily shows a possible implementation process of the method. As shown in the figure, the process may include the following steps:
  • S1301 The terminal determines that a condition for a first localized service is met.
  • the method for determining whether the conditions for localized services are met is substantially the same as that of the aforementioned embodiment, except that, since the relevant information on the conditions for localized services is preconfigured on the terminal, the terminal itself can determine whether the terminal meets the conditions for localized services.
  • the terminal obtains the user's choice by interacting with the user, wherein the user's choice includes agreeing to switch the access type or disagreeing to switch the access type. If the user agrees to switch the access type, the process proceeds to S1304, otherwise, the process proceeds to S1305.
  • the terminal may provide a user interface for obtaining a user selection, and the user interface may provide an option of agreeing to switch the access type and an option of disagreeing to switch the access type.
  • the user may submit his or her selection to the terminal through human-computer interaction.
  • the terminal may also obtain the user's selection in other ways, such as by voice inquiry, and identify whether the user agrees to switch the access type according to the received user response voice.
  • S1304 The terminal switches from an access network corresponding to a first access type (i.e., the access type of the network currently accessed by the terminal) to an access network corresponding to a second access type, and reselects a network according to preconfigured network selection information after the switching is completed.
  • the second access type is different from the first access type.
  • the terminal can switch to 3GPP access by executing the process shown in Figure 3; if the first access type is 3GPP access, the terminal can switch to non-3GPP access by executing the process shown in Figure 4.
  • the terminal can temporarily turn off automatic network selection, wait for the service to end, and then reselect the network according to the pre-configured network selection information.
  • the terminal can also manually reselect the network by the user after waiting for the service to end. For example, the user can select the network to be accessed from the pre-configured network selection list.
  • S1306 The terminal reselects a network according to the pre-configured network selection information.
  • the automatic network selection is turned off, or the user is asked to switch the access type by interaction.
  • the above process can avoid interrupting the service currently being executed by the UE when the UE reselects the network, thereby reducing the impact on the current service.
  • Some embodiments of the present application also provide a communication method, in which, for the case where network selection information is pre-configured on the terminal, when the network is reselected, the selected network is accessed by selecting an access type different from the current access type to reduce or avoid the impact of the network selection on the current service.
  • the network selection information preconfigured on the terminal may include, but is not limited to, an identifier of a localized service, a condition of a localized service, and a network selection list for selecting a hosting network.
  • the condition of a localized service may be a condition based on a service location required by the localized service, or a condition based on a service start time of the localized service, or a condition based on a service location and a service start time.
  • the network selection list includes an identifier of a hosting network, and optionally, a hosting network has the highest priority.
  • the access type of the network currently accessed by the terminal (hereinafter referred to as the first access type) and the access type allowed by the first network (i.e., the network used to provide the first localized service) are obtained; if the access type allowed by the first network is the same as the first access type, the terminal switches from the access network corresponding to the first access type to the access network corresponding to the second access type (the second access type is different from the first access type), and switches to the access network corresponding to the second access type.
  • the terminal After accessing the network, the terminal reselects the network according to the preconfigured network selection information. Since the preconfigured network selection information includes the first network, the terminal can select the first network for access to use the first localized service.
  • the terminal reselects the network according to the preconfigured network selection information. Since the preconfigured network selection information includes the first network, the terminal can select the first network for access to use the first localized service.
  • This process can be applied to the system architecture shown in Figure 7.
  • the first core network device in the process can be AMF
  • the second core network device can be UDM.
  • This process can also be applied to an evolved system architecture or other system architectures, which is not limited in this embodiment of the present application.
  • FIG14 exemplarily shows a possible implementation method of the above process.
  • the UE determines the access type of the hosting network and compares it with the access type of the current serving network to determine which access type the UE uses to access the hosting network, thereby reducing the impact on the current service.
  • the process may include the following steps:
  • Step 1401 The UE determines whether a condition for a first localized service is met according to pre-configured localized service information.
  • Step 1402 The UE compares the access type allowed by the hosting network (i.e., the first network used to provide the first localized service) and the first access type (i.e., the access type of the serving network currently being used by the UE). If the two conflict, execute step 1403; otherwise, execute step 1404.
  • the hosting network i.e., the first network used to provide the first localized service
  • the first access type i.e., the access type of the serving network currently being used by the UE.
  • the access type allowed by the hosting network is the same as the first access type, then a conflict occurs between the two, for example, if the hosting network is only accessible via 3GPP and the first access type is also a 3GPP access; or, if the hosting network is only accessible via non-3GPP and the first access type is also a non-3GPP access.
  • the access types allowed by the hosting network include a second access type (the second access type is different from the first access type), it indicates that there is no conflict between the two, or there is a possibility of no conflict.
  • Step 1403 The terminal switches from the access network corresponding to the first access type to the access network corresponding to the second access type, that is, performs access type switching, and after switching to the access network corresponding to the second access type, performs network reselection according to the pre-configured network selection information.
  • the terminal can switch to 3GPP access by executing the process shown in Figure 3; if the first access type is 3GPP access, the terminal can switch to non-3GPP access by executing the process shown in Figure 4.
  • the UE After the terminal completes the access type switching, the access types used by the serving network and the hosting network are different, so there will be no conflict. At this time, the UE reselects the network according to the pre-configured network selection information to access the hosting network.
  • Step 1404 The UE performs network reselection according to the pre-configured network selection information. After selecting the hosting network, the UE accesses the hosting network through the access network corresponding to the second access type according to the second access type.
  • the above process compares the access type allowed by the hosting network with the access type of the UE's current serving network. If a conflict occurs, the access type of the current serving network is changed to a different type from the type allowed by the hosting network. When there is no conflict between the two, the connection of the serving network will not be affected when the UE reselects a network to access the hosting network. Therefore, the above process can avoid affecting the services in the current serving network when the UE reselects a network to access the hosting network.
  • an embodiment of the present application further provides a communication device, as shown in FIG. 15 , where the communication device 1500 may include a processing unit 1501 and a transceiver unit 1502 .
  • the communication device 1500 can implement the functions of the first core network device in Figure 8 or Figure 9.
  • the processing unit 1500 is used to: when it is determined that the terminal meets the conditions of the first localized service, obtain the access type of the network currently accessed by the terminal and the access type allowed by the first network, the first network is a network for providing the first localized service, and the access type of the network currently accessed by the terminal is the first access type; if the access type allowed by the first network is the same as the first access type, then instruct the terminal to switch from the access network corresponding to the first access type to the access network corresponding to the second access type through the transceiver unit 1502, and the second access type is different from the first access type; and after determining that the terminal switches to the access network corresponding to the second access type, trigger the core network to send the first network selection information to the terminal.
  • the communication device 1500 can implement the function of the first core network device in Figure 10 or Figure 11.
  • the processing unit 1501 is used to: when it is determined that the terminal meets the conditions of the first localized service, obtain the access type of the network currently accessed by the terminal and the access type allowed by the first network, the first network is a network for providing the first localized service, and the access type of the network currently accessed by the terminal is the first access type; and, if the access type allowed by the first network includes a second access type, and the second access type is different from the first access type, then trigger the core network to send network selection information to the terminal, and the network selection information is used to indicate the second access type.
  • the communication device 1500 may implement the function of the first core network device in Figure 12.
  • the processing unit 1501 is used to: when determining that the terminal meets the conditions of the first localized service, notify the first core network device when indicating that the terminal does not have an ongoing service through the transceiver unit 1502; after receiving the indication information sent by the terminal for notifying the terminal that there is no ongoing service through the transceiver unit 1502, trigger the core network to send network selection information to the terminal.
  • the communication device 1500 can implement the functions of the terminal in Figure 13.
  • the processing unit 1501 is used to: when it is determined that the condition of the first localized service is met, determine whether the terminal currently has a service in progress; if there is a service in progress, determine whether to switch the access type according to the user's selection, and if it is determined to switch the access type, switch from the access network corresponding to the first access type to the access network corresponding to the second access type, and perform network reselection according to the network selection information after the switching is completed, and the second access type is different from the first access type.
  • the communication device 1500 can implement the functions of the terminal in Figure 14.
  • the processing unit 1501 is used to: when it is determined that the condition of the first localized service is met, obtain the access type of the network currently accessed by the terminal and the access type allowed by the first network, the first network is a network for providing the first localized service, and the access type of the network currently accessed by the terminal is the first access type; if the access type allowed by the first network is the same as the first access type, switch from the access network corresponding to the first access type to the access network corresponding to the second access type, and after switching to the access network corresponding to the second access type, select the first network for access; wherein the second access type is different from the first access type.
  • the above-mentioned communication device provided in the embodiment of the present application can implement all the method steps implemented by the corresponding devices in the above-mentioned method embodiment, and can achieve the same technical effect.
  • the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.
  • the above-mentioned communication device 1500 can implement the method steps in the above-mentioned method embodiment and can achieve the same technical effects.
  • the parts and beneficial effects of this embodiment that are the same as those of the method embodiment will not be described in detail here.
  • FIG16 only shows the structure required for the communication device 1600 to execute the method shown in the present application, and the present application does not limit the communication device to have more components.
  • the communication device 1600 can be used to execute the steps performed by the relevant device in the above method embodiment, for example, the relevant device can be a first core network device (such as AMF), or a terminal, etc.
  • AMF first core network device
  • the communication device 1600 may include a transceiver 1601, a memory 1603, and a processor 1602, and the transceiver 1601, the memory 1603, and the processor 1602 may be connected via a bus 1604.
  • the transceiver 1601 may be used for the communication device to communicate, such as for sending or receiving signals.
  • the memory 1603 is coupled to the processor 1602 and may be used to store programs and data necessary for the communication device 1600 to implement various functions. The above memory 1603 and the processor 1602 may be integrated or independent of each other.
  • the transceiver 1601 may be a communication port, such as a communication port (or interface) used for communication between network elements.
  • the transceiver 1601 may also be referred to as a transceiver unit or a communication unit.
  • the processor 1602 may be implemented by a processing chip or a processing circuit.
  • the transceiver 1601 may receive or send information wirelessly or by wire.
  • the communication device may include a processor, and the processor calls an external transceiver and/or memory to implement the above functions or steps or operations.
  • the communication device may also include a memory, and the processor calls and executes the program stored in the memory to implement the above functions or steps or operations.
  • the communication device may also include a processor and a transceiver (or a communication interface), and the processor calls and executes the program stored in the external memory to implement the above functions or steps or operations.
  • the communication device may also include a processor, a memory, and a transceiver.
  • the embodiment of the present application further provides a computer-readable storage medium, on which program instructions (or computer programs, instructions) are stored, and when the program instructions are executed by the processor, the computer executes the operations performed by the first network element, the radio access network or the policy control function in any possible implementation of the above method embodiment or the method embodiment.
  • the present application also provides a computer program product, including program instructions, which, when called and executed by a computer, can enable the computer to implement the operations performed by the first network element, the radio access network or the policy control function in any possible implementation of the above method embodiment or the method embodiment.
  • the present application also provides a chip or a chip system, which is coupled to a transceiver and is used to implement the operations performed by the first network element, the wireless access network or the policy control function in the above method embodiment or any possible implementation of the method embodiment.
  • the chip system may include the chip, as well as components such as a memory and a communication interface.
  • the embodiment of the present application also provides a communication system.
  • the communication system includes a first core network device and a second core network device, the first core network device can perform the operation of the first core network device in Figure 8 or Figure 9, and the second core network device can perform the operation of the second core network device in Figure 8 or Figure 9.
  • the present application embodiment also provides a communication system.
  • the communication system includes The first core network device and the second core network device, wherein the first core network device can perform the operations of the first core network device in Figure 10 or Figure 11, and the second core network device can perform the operations of the second core network device in Figure 10 or Figure 11.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.
  • These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

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Abstract

一种通信方法及装置，涉及通信技术领域。该方法包括：当第一核心网设备确定终端满足第一本地化服务的条件时，获取终端当前接入的网络的接入类型以及第一网络允许的接入类型，若所述第一网络允许的接入类型与第一接入类型相同，则第一核心网设备指示终端从第一接入类型对应的接入网切换到第二接入类型对应的接入网，当第一核心网设备确定终端切换完成后，触发核心网向终端发送第一选网信息。其中，第一网络为用于提供第一本地化服务的网络，终端当前接入的网络的接入类型为第一接入类型。该方法可以减小重新选网操作对终端正在进行的业务的影响。

Description

一种通信方法及装置
相关申请的交叉引用
本申请要求在2022年10月10日提交中国专利局、申请号为202211237047.0、申请名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
本地化服务(localized service)是一种特殊的网络服务，可以由运营商或第三方服务提供商提供。本地化服务具有灵活的部署方式，便于第三方服务提供商在限定的时间和/或地点范围内部署特定的本地化服务。本地化服务由hosting network(hosting network是为终端提供本地化服务的网络，也可称为托管网络)提供连接。当终端订阅本地化服务后，可以在特定的时间和/或地点使用该本地化服务。
相关技术中，当终端满足本地化服务的条件(比如满足本地化服务的时间和/或地点要求)，并且处于提供该本地化服务的hosting network覆盖范围内时，终端执行重新选网的流程，以接入该hosting network。终端在接入hosting network后，才能使用该hosting network提供的本地化服务。基于选网机制，终端会在当前网络释放所有会话，执行去注册操作，进入空闲态，然后重新进行选网，如果此时终端正在执行业务，则会导致当前正在执行的业务被中断，影响业务连续性。
因此，如何减小或避免重新选网操作对当前正在进行的业务的影响，是目前需要解决的技术问题。
发明内容
本申请实施例提供一种通信方法及装置，用以减小重新选网操作对终端正在进行的业务的影响。
第一方面，提供一种通信方法，该方法可以包括以下步骤：当第一核心网设备确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；若所述第一网络允许的接入类型与所述第一接入类型相同，则所述第一核心网设备指示所述终端从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，所述第二接入类型与所述第一接入类型不同；所述第一核心网设备确定所述终端切换到所述第二接入类型对应的接入网后，触发核心网向所述终端发送第一选网信息。
上述实现方式中，当终端满足本地化服务的条件时，如果第一网络(即提供该本地化服务的网络，也即hosting network)允许的接入类型与第一接入类型(即终端当前接入的网络(即serving network)的接入类型)相同，表明两者发生冲突，则第一核心网设备可以指示终端从第一接入类型对应的接入网切换到与第一接入类型不同的接入类型对应的接入网，并在切换完成后触发核心网向终端发送第一选网信息，这样，由于在终端基于选网信息进行网络重选之前，已经进行了接入网的切换，当终端基于选网信息选择第一网络进行网络接入时，第一网络的接入类型与终端的serving network的接入类型不同，因此终端当前执行的业务不会被中断，保证了业务的连续性。
在一种可能的实现方式中，所述第一核心网设备确定所述终端切换到所述第二接入类型对应的接入网，包括：所述第一核心网设备向所述终端发送第一指示信息，并接收所述终端发送的第二指示信息，所述第一指示信息用于指示所述终端在完成所述切换后向所述第一核心网设备发送所述第二指示信息，所述第二指示信息用于指示所述终端完成所述切换；或者，所述第一核心网设备根据所述终端的接入网连接信息，确定所述终端切换到所述第二接入类型对应的接入网。
上述实现方式可以保证第一核心网设备在确定终端切换到第二接入类型对应的接入网后，才触发核心网向终端发送第一选网信息，从而可以保证在切换完成后才会接收网络侧发送的选网信息，进而才根据该选取信息进行网络重选，从而可以保证终端侧业务的连续性。
在一种可能的实现方式中，当所述第一核心网设备确定所述终端满足第一本地化服务的条件时，所述方法还包括：所述第一核心网设备获取所述终端的业务状态；所述获取所述第一网络允许的接入类型， 包括：若所述终端的业务状态表明所述终端有业务正在进行，则所述第一核心网设备获取所述第一网络允许的接入类型。
上述实现方式中，只有在终端当前有业务正在进行的情况下，第一核心网设备才获取所述第一网络允许的接入类型，进而执行后续的操作(包括在所述第一网络允许的接入类型与所述第一接入类型相同的情况下，指示所述终端从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网)，否则不会执行获取所述第一网络允许的接入类型的操作，也就不会执行后续指示终端进行切换的操作。也就是说，只有终端当前有业务正在进行的情况，才有必要指示终端进行切换以保证业务连续性，针对终端当前没有业务正在进行的情况，可以不指示终端进行切换，从而可以节省网络侧和终端侧的处理开销，可以节省网络资源开销。
可选的，所述第一核心网设备获取所述终端的业务状态，包括：所述第一核心网设备向所述终端发送第一请求信息，所述第一请求信息用于请求查询所述终端的业务状态；所述第一核心网设备接收所述终端基于所述第一请求信息发送的第一响应信息，所述第一响应信息用于指示所述终端的业务状态。
可选的，所述第一响应消息中包括第三指示信息，所述第三指示信息用于指示所述终端的业务状态。
在一种可能的实现方式中，所述第一核心网设备获取所述第一网络允许的接入类型，包括：所述第一核心网设备向第二核心网设备发送第二请求信息，所述第二请求信息包括所述终端的标识和所述第一网络的标识；所述第一核心网设备接收所述第二核心网设备基于所述第二请求信息发送的第二响应信息，所述第二响应信息包括所述第一网络允许的接入类型的指示信息。
上述实现方式中，第一核心网设备可以从第二核心网设备获取第一网络允许的接入类型。
可选的，所述第二请求信息还包括第四指示信息，所述第四指示信息用于指示所述第二核心网设备向所述第一核心网设备返回所述第一网络允许的接入类型。
在一种可能的实现方式中，当第一核心网设备确定终端满足第一本地化服务的条件时，所述方法还包括：若所述第一网络允许的接入类型中包括第二接入类型，所述第二接入类型与所述第一接入类型不同，则所述第一核心网设备触发核心网向所述终端发送第二选网信息，所述第二选网信息用于指示所述第二接入类型。
上述实现方式中，当终端满足本地化服务的条件时，如果第一网络(hosting network，即提供该本地化服务的网络)允许的接入类型中包括与第一接入类型(即终端当前接入的serving network的接入类型)不同的第二接入类型，表明两者不发生冲突或者可能发生/不发生冲突，则第一核心网设备可以触发核心网向终端发送选网信息，所述选网信息用于指示第二接入类型，这样，当终端基于该选网信息选择hosting network后，根据该第二接入类型，通过第二接入类型对应的接入网接入hosting network，从而可以保证hosting network的接入类型与该终端的serving network的接入类型不同，因此终端当前执行的业务不会被中断，保证了业务的连续性。
在一种可能的实现方式中，所述第二选网信息包括所述第一网络的信息，以使得终端在进行网络重选时可以选择第一网络，从而可以使用第一网络提供的第一本地化服务。
在一种可能的实现方式中，所述第二选网信息还用于指示推荐给所述终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括所述第一网络，所述第一网络的优先级最高，以使得终端在进行网络重选时可以优先选择第一网络，从而可以使用第一网络提供的第一本地化服务。
可选的，所述第二选网信息包括选网列表，所述选网列表中包括所述推荐给所述终端进行网络重选的至少一个网络以及用于指示所述第一网络的接入类型的信息。
在一种可能的实现方式中，所述第一核心网设备触发核心网向所述终端发送第二选网信息，包括：所述第一核心网设备向第二核心网设备发送所述终端的标识、所述第一网络的标识、所述第二接入类型的指示信息；其中，所述第二核心网设备用于根据所述终端的标识、所述第一网络的标识获取所述终端对应的选网列表，并根据所述选网列表以及所述第二接入类型的指示信息生成所述第二选网信息；所述第一核心网设备接收所述第二核心网设备发送的所述第二选网信息；所述第一核心网设备将所述第二选网信息发送给所述终端。
可选的，所述第一核心网设备还将第五指示信息发送给所述第二核心网设备，所述第五指示信息用于指示所述第二核心网设备根据所述第二接入类型的指示信息以及所述终端对应的选网列表生成所述第二选网信息。
在一种可能的实现方式中，所述第一接入类型为3GPP接入类型，所述第二接入类型为非3GPP接入类型；或者，所述第一接入类型为非3GPP接入类型，所述第二接入类型为3GPP接入类型。
第二方面，提供一种通信方法，包括：当第一核心网设备确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；若所述第一网络允许的接入类型中包括第二接入类型，所述第二接入类型与所述第一接入类型不同，则所述第一核心网设备触发核心网向所述终端发送选网信息，所述选网信息用于指示所述第二接入类型。
在一种可能的实现方式中，所述选网信息包括所述第一网络的信息。
在一种可能的实现方式中，所述选网信息还用于指示推荐给所述终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括所述第一网络，所述第一网络的优先级最高。
在一种可能的实现方式中，所述选网信息包括选网列表，所述选网列表中包括所述推荐给所述终端进行网络重选的至少一个网络以及用于指示所述第一网络的接入类型的信息。
在一种可能的实现方式中，所述第一核心网设备触发核心网向所述终端发送选网信息，包括：所述第一核心网设备向第二核心网设备发送所述终端的标识、所述第一网络的标识、所述第二接入类型的指示信息；其中，所述第二核心网设备用于根据所述终端的标识、所述第一网络的标识获取所述终端对应的选网列表，并根据所述选网列表以及所述第二接入类型的指示信息生成所述选网信息；所述第一核心网设备接收所述第二核心网设备发送的所述选网信息；所述第一核心网设备将所述选网信息发送给所述终端。
在一种可能的实现方式中，所述第一核心网设备还将第五指示信息发送给所述第二核心网设备，所述第五指示信息用于指示所述第二核心网设备根据所述第二接入类型的指示信息以及所述终端对应的选网列表生成所述选网信息。
在一种可能的实现方式中，当所述第一核心网设备确定所述终端满足第一本地化服务的条件时，所述方法还包括：所述第一核心网设备获取所述终端的业务状态；所述获取所述第一网络允许的接入类型，包括：若所述终端的业务状态表明所述终端有业务正在进行，则所述第一核心网设备获取所述第一网络允许的接入类型。
在一种可能的实现方式中，所述第一核心网设备获取所述终端的业务状态，包括：所述第一核心网设备向所述终端发送第一请求信息，所述第一请求信息用于请求查询所述终端的业务状态；所述第一核心网设备接收所述终端基于所述第一请求信息发送的第一响应信息，所述第一响应信息用于指示所述终端的业务状态。
在一种可能的实现方式中，所述第一响应消息中包括第三指示信息，所述第三指示信息用于指示所述终端的业务状态。
在一种可能的实现方式中，所述第一核心网设备获取所述第一网络允许的接入类型，包括：所述第一核心网设备向第二核心网设备发送第二请求信息，所述第二请求信息包括所述终端的标识和所述第一网络的标识；所述第一核心网设备接收所述第二核心网设备基于所述第二请求信息发送的第二响应信息，所述第二响应信息包括所述第一网络允许的接入类型的指示信息。
在一种可能的实现方式中，所述第二请求信息还包括第四指示信息，所述第四指示信息用于指示所述第二核心网设备向所述第一核心网设备返回所述第一网络允许的接入类型。
在一种可能的实现方式中，所述第一接入类型为3GPP接入类型，所述第二接入类型为非3GPP接入类型；或者，所述第一接入类型为非3GPP接入类型，所述第二接入类型为3GPP接入类型。
第三方面，提供一种通信方法，所述方法包括：当第一核心网设备确定终端满足第一本地化服务的条件时，所述第一核心网设备指示所述终端不存在正在进行的业务时通知所述第一核心网设备；所述第一核心网设备接收所述终端发送的用于通知所述终端不存在正在进行的业务的指示信息后，触发核心网向所述终端发送选网信息。
在一种可能的实现方式中，所述选网信息包括所述第一网络的信息，所述第一网络为提供所述第一本地化服务的网络。
在一种可能的实现方式中，所述选网信息用于指示推荐给所述终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括所述第一网络，所述第一网络的优先级最高。
第四方面，提供一种通信方法，包括：当终端确定满足第一本地化服务的条件时，获取所述终端当 前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；若所述第一网络允许的接入类型与所述第一接入类型相同，则所述终端从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，并在切换到所述第二接入类型对应的接入网后，选择所述第一网络进行接入；其中，所述第二接入类型与所述第一接入类型不同。
在一种可能的实现方式中，所述方法还包括：若所述第一网络允许的接入类型中包括第二接入类型，所述第二接入类型与所述第一接入类型不同，则所述终端选择所述第一网络，并通过所述第二接入类型对应的接入网接入所述第一网络。
第五方面，提供一种通信方法，包括：终端满足第一本地化服务的条件时，确定所述终端当前是否有业务正在进行；若所述终端当前有业务正在进行，则所述终端根据用户的选择确定是否切换接入类型，若确定切换接入类型，则所述终端从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，并在完成切换后根据选网信息进行网络重选，所述第二接入类型与所述第一接入类型不同。
在一种可能的实现方式中，所述方法还包括：若根据用户的选择确定不切换接入类型，则所述终端在当前正在执行的业务结束后，根据所述选网信息进行网络重选。
在一种可能的实现方式中，所述方法还包括：若所述终端当前没有业务正在进行，则所述终端根据所述选网信息进行网络重选。
第六方面，提供一种通信装置，包括处理单元和收发单元；所述处理单元，用于：当确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；若所述第一网络允许的接入类型与所述第一接入类型相同，则通过所述收发单元指示所述终端从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，所述第二接入类型与所述第一接入类型不同；以及确定所述终端切换到所述第二接入类型对应的接入网后，触发核心网向所述终端发送第一选网信息。
第七方面，提供一种通信装置，包括处理单元和收发单元；所述处理单元，用于：当确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；以及，若所述第一网络允许的接入类型中包括第二接入类型，所述第二接入类型与所述第一接入类型不同，则触发核心网向所述终端发送选网信息，所述选网信息用于指示所述第二接入类型。
第八方面，提供一种通信系统，包括：第一核心网设备和第二核心网设备，所述第一核心网设备用于执行上述第一方面中任一项所述的方法，所述第二核心网设备用于根据所述第一核心网设备的通知，触发核心网向所述终端发送第一选网信息。
第九方面，提供一种通信系统，包括：第一核心网设备和第二核心网设备，所述第一核心网设备用于执行如上述第二方面中任一项所述的方法，所述第二核心网设备用于根据所述第一核心网设备的通知，触发核心网向所述终端发送第二选网信息。
第十方面，提供一种通信装置，包括：一个或多个处理器；其中，当一个或多个计算机程序的指令被所述一个或多个处理器执行时，使得所述通信装置执行上述第一方面中任一项所述的方法，或者执行上述第二方面中任一项所述的方法，或者执行上述第三方面中任一项所述的方法，或者执行上述第四方面中任一项所述的方法，或者执行上述第五方面中任一项所述的方法。
第十一方面，提供一种计算机可读存储介质，所述计算机可读存储介质包括计算机程序，当计算机程序在计算设备上运行时，使得所述计算设备执行上述第一方面中任一项所述的方法，或者执行上述第二方面中任一项所述的方法，或者执行上述第三方面中任一项所述的方法，或者执行上述第四方面中任一项所述的方法，或者执行上述第五方面中任一项所述的方法。
第十二方面，提供一种芯片，所述芯片与存储器耦合，用于读取并执行所述存储器中存储的程序指令，以实现上述第一方面中任一项所述的方法，或者上述第二方面中任一项所述的方法，或者上述第三方面中任一项所述的方法，或者上述第四方面中任一项所述的方法，或者执行上述第五方面中任一项所述的方法。
第十三方面，提供一种计算机程序产品，所述计算机程序产品在被计算机调用时，使得所述计算机执行上述第一方面中任一项所述的方法，或者执行上述第二方面中任一项所述的方法，或者执行上述第 三方面中任一项所述的方法，或者执行上述第四方面中任一项所述的方法，或者执行上述第五方面中任一项所述的方法。
以上第二方面到第十三方面的有益效果，请参见第一方面的有益效果，不重复赘述。
附图说明
图1为相关技术中hosting network与第三方及归属网络互操作架构图；
图2为相关技术中候选网络的优先级顺序示意图；
图3为相关技术中PDU会话从non-3GPP接入到3GPP接入的切换流程示意图；
图4为相关技术中PDU会话从3GPP接入到non-3GPP接入切换流程的示意图；
图5为相关技术中的HPLMN向终端更新选网列表的流程；
图6为相关技术中临时网络重选的流程示意图；
图7为相关技术中3GPP系统的架构示意图；
图8为本申请实施例提供的一种通信方法的流程示意图；
图9为本申请实施例中图8所示流程的一个示例流程的示意图；
图10为本申请实施例提供的另一种通信方法的流程示意图；
图11为本申请实施例中图10所示流程的一个示例流程的示意图；
图12为本申请实施例提供的另一种通信方法的流程示意图；
图13为本申请实施例提供的另一种通信方法的流程示意图；
图14为本申请实施例提供的另一种通信方法的流程示意图；
图15为本申请实施例提供的通信装置的结构示意图；
图16为本申请实施例提供的另一种通信装置的结构示意图。
具体实施方式
为了使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施例作进一步的详细描述。
应理解，本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A，B可以是单数或者复数。在本申请的文字描述中，字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a、b和c中的至少一项(个)，可以表示：a，或，b，或，c，或，a和b，或，a和c，或，b和c，或，a、b和c。其中a、b和c分别可以是单个，也可以是多个。术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元。方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
下面先对本申请实施例中涉及的相关技术进行说明。
(一)本地化服务和hosting network架构。
本地化服务(localized service)是一种网络服务，本地化服务由运营商或第三方服务提供商提供，当终端订阅本地化服务后，可以在指定时间和/或地点使用本地化服务。本地化服务由hosting network提供连接，终端需要接入hosting network，并且满足本地化服务的时间和/或地点的要求，才能使用本地化服务。本地化服务具有灵活的部署方式，便于第三方服务提供商在限定的时间和/或地点范围内部署特定的服务。
Hosting network即本地化服务中为终端提供服务的网络。图1示例性示出了一种hosting network的架构。hosting network是提供连接以获取本地化服务的网络。hosting network可以是非公共网(non-publicnetwork，NPN)，也可以是公共陆地移动网(public land mobile network，PLMN)。该网络可能仅在特定地理位置和/或特定时间内提供覆盖(可能与本地化服务相关)。本地化服务可以是由hosting network运营商提供，也可以是由第三方服务提供商提供。
当用户想要通过hosting network获取本地化服务时，需要先接入hosting network，再通过hosting  network获取本地化服务。由于本地化服务可能是在特定地理位置和/或特定时间内才可获取，或者hosting network是在特定地理位置和/或特定时间内才有覆盖，因此终端需要在特定地理位置和/或特定时间内接入hosting network，从而获取本地化服务。
(二)网络重选以及选网优先级。
网络选择分为两种情况：一种是自动选网，即终端按照可用的候选网络(比如包括PLMN和/或NPN)的优先级顺序自动选择一个网络(比如选择一个PLMN或NPN)，在该网络下选择最好的小区进行注册；另一种是手动选网，即，将当前的所有候选网络呈现给用户，由用户选择一个网络，在该网络下选择最好的小区进行注册。
自动选网主要分为三个过程：网络选择、小区选择、位置登记。简言之，当终端选中一个网络后，就开始选择属于这个网络的小区。当搜索(或扫描)到属于该网络的小区后，从系统信息广播中获取邻近小区的信息，终端在所有这些小区中选择一个信号最好的小区进行驻留，然后终端发起位置登记过程。位置登记成功后，终端入网成功，即成功驻留在小区中。
在进行网络选择时，终端按照选网列表中的候选网络的优先顺序，从中选择优先级高的网络。图2示例性示出了一种网络优先级顺序。选网列表中的网络，遵循以下优先级顺序：
注册的PLMN(registered PLMN，RPLMN)：指上次注册的PLMN，优先级最高；
等效PLMN(equivalent PLMN，EPLMN)：是RPLMN的等效PLMN，由于终端中可能保存着RPLMN的小区信息(比如频点、扰码等)，这些信息可以帮助后续小区选择的速度，所以EPLMN优先级低于RPLMN；
归属PLMN(home PLMN，HPLMN)/等效归属PLMN(equivalent home PLMN，EHPLMN)：EHPLMN是HPLMN的等效PLMN，存储在终端的全球用户识别卡(universal subscriber identity module，USIM)中，EHPLMN与HPLMN优先级相同；若RPLMN是HPLMN，则EPLMN与EHPLMN相同，若RPLMN不是HPLMN，则EPLMN与EHPLMN不同；
用户控制的PLMN(User controlled PLMN，UPLMN)：为用户控制的PLMN，即为终端在手工选网时注册过的PLMN，终端的USIM中存储有UPLMN信息；
运营商控制的PLMN(operator controlled PLMN，OPLMN)：为运营商控制的PLMN，OPLMN的信息存储在终端的USIM中，当用户与归属运营商签署漫游协议时，运营商的PLMN的信息被存储在终端的USIM中；
拜访地PLMN(visited PLMN，VPLMN)；
禁用PLMN(forbidden PLMN，FPLMN)：指禁止PLMN，终端不能进行注册的PLMN。
当终端执行网络选择时，按照上述优先级顺序，从选网列表中选择合适的网络，如果选择出的网络在所在位置有覆盖，则终端接入该网络，否则，终端继续按照上述优先级顺序从选网列表中选择网络。当终端执行选网流程时，需要处于空闲态，即终端将释放当前的所有会话，结束所有业务，然后进行网络重选。
(三)协议数据单元(protocol data unit，PDU)会话在第三代合作伙伴计划(3rd generation partnership project，3GPP)/非3GPP(non-3GPP，N3GPP)接入间切换的流程。
目前，切换流程可以分为PDU会话从3GPP接入切换到non-3GPP接入，或是从non-3GPP接入切换到3GPP接入两种。
如图3所示，PDU会话从non-3GPP连接切换到3GPP连接的过程可以包括：
步骤301：如果终端还未通过3GPP接入完成注册，则按照协议23502中4.2.2.2.2的流程完成注册；
步骤302：终端根据需要切换的PDU会话的会话ID，通过3GPP接入建立一个新的会话，这一部分可以参考协议23502中4.3.2.2.1的相关内容；
步骤303：如果此时用户面仍然在non-3GPP接入中激活，则按照协议23502中4.3.4.2步骤4至步骤7以及4.3.4.2步骤7a的流程来释放non-3GPP接入的资源，由于此时释放会话并不是为了释放整个PDU会话，因此在这一步骤中不会涉及任何终端侧的会话释放。
如图4所示，PDU会话从3GPP连接切换到non-3GPP连接的过程可以包括：
步骤401：如果终端还未通过non-3GPP接入完成注册，则按照协议23502中4.12.2的流程完成注册；
步骤402：终端根据需要切换的PDU会话的会话ID，通过non-3GPP接入建立一个新的会话，这 一部分可以参考协议23502中4.12.5的相关内容；
步骤403：如果此时用户面仍然在3GPP接入中激活，则按照协议23502中4.3.4.2步骤3b以及4.3.4.2步骤4至步骤7a/7b的流程来释放3GPP的资源，由于此时释放会话并不是为了释放整个PDU会话，因此在这一步骤中不会涉及任何终端侧的会话释放。
(四)漫游切换(steering of roaming，SOR)。
当终端注册至HPLMN或者VPLMN后，HPLMN向终端发送更新的选网列表，以便终端根据该选网列表进行网络重选，该过程称为SOR过程。图5示例性示出了SOR过程，该过程可以包括以下步骤：
步骤500：若HPLMN网络中的统一数据管理功能(unifieddata management，UDM)支持从SOR应用功能(SORapplication function，SOR-AF)获取选网列表(该选网列表称为首选PLMN与接入技术结合(preferred PLMN/access technology combinations)的列表)，则SOR-AF可以向HPLMN UDM(即HPLMN中的UDM)发送选网列表。SOR-AF向HPLM NUDM发送更新请求(Nudm_ParameterProvision_Update request)消息，该消息中包括了更新的选网列表。
步骤501：HPLMN UDM获取更新的选网列表(可能是由SOR-AF发送，也可能是从统一数据仓库功能(unifieddata repository，UDR)获取)。HPLMN UDM向接入与移动管理功能(access and mobility management function，AMF)通知用户资料更新。该AMF为终端注册的网络的AMF(即如果终端注册至HPLMN，则该AMF为HPLMN中的AMF；若终端在VPLMN注册，则该AMF为VPLMN中的AMF)。HPLMN UDM向AMF发送通知请求(Nudm_SDM_Notification request)消息，该消息中包括需要向终端发送的更新的选网列表。一种可能的实现方式中，该更新的选网列表包括于SOR信息(steering of roaming information)中。
步骤502：AMF向终端(user equipment，UE，也称用户设备)发送下行非接入层(non-access-stratum，NAS)消息，该消息中包括从UDM获取的信息。即AMF将从UDM获取的信息透传至终端。若UDM向AMF发送更新的选网列表，则该下行NAS消息中包括该选网列表。若UDM向AMF发送SOR信息，该SOR信息包括更新的选网列表，则AMF向终端发送的下行NAS消息中包括该SOR信息。
步骤503：当终端接收该SOR信息(或选网列表)后，终端执行安全检查，确认该信息是由HPLMN提供的。若安全检查成功，则终端将该信息上传至USIM中，或者替换终端中存储的OPLMN选择列表，该列表称为Operator Controlled PLMN Selector with Access Technology列表。
步骤504：若UDM请求终端反馈一个响应消息，则终端在上行NAS消息中包括该响应消息。可选的，该响应消息包含于上行NAS消息中的SOR透传容器(SOR transparent container)。
步骤505：AMF向UDM发送SOR透传容器中包括的信息(Nudm_SDM_Info消息)。该信息是终端发送的上行NAS消息中的SOR透传容器包括的信息。其中，SOR透传容器中包括终端发送的响应消息。UDM验证该响应消息是由终端发送的。
步骤506：若该更新的选网列表是由SOR-AF提供的，则HPLMN UDM可以向SOR-AF发送消息，表示该选网列表已成功传输至终端。HPLMN UDM向SOR-AF发送Nsoraf_SoR_Info消息，其中包括成功传输的信息。
(五)临时网络重选(temporarynetworkreselection，TNR)流程。
图6示例性示出了一种TNR流程，该流程可以包括以下步骤：
步骤600：终端已经通过AMF注册到VPLMN或HPLMN中。
步骤601：终端通过NAS消息发送TNR信息，向网络侧请求鉴权。一种可能的实现方式中，终端通过注册请求发送该信息。所述TNR信息包括：
-TNR程序的开启时间和结束时间请求；
-选择使用的本地化服务标识；
-选择的hosting network标识。
步骤602：AMF根据终端提供的TNR信息向UDM更新终端上下文，其中包含TNR信息。
步骤603a至步骤603d：基于从AMF处收到的TNR信息，UDM向SOR-AF请求为终端对TNR信息中请求的网络进行鉴权。SOR-AF向UDM更新SOR信息，并通过认证服务功能(authentication server function，AUSF)对SOR信息进行保护。
步骤604至步骤610：按照上述图5所示的SOR流程对终端进行SOR信息更新。
步骤611：终端满足本地化服务条件时，根据SOR信息提供的选网列表进行网络选择。当具有更 高优先级的网络出现时，终端执行网络重选。
(六)3GPP系统架构。
图7示出了3GPP系统的架构示意图，该系统架构中包含终端、(无线)接入网((Radio)access network，(R)AN)和核心网设备。其中，与本申请实施例相关的设备可以包括：
终端：也可以称为终端设备。本申请实施例的终端设备可以为无源终端设备或半无源终端设备。本申请实施例的终端设备还可以称为被动(passive)终端设备。本申请实施例的终端设备比如可以为标签、用户设备(user equipment，UE)等。终端设备可以广泛应用于各种场景，例如，物联网(internet of things，IOT)、设备到设备(device-to-device，D2D)、车物(vehicle to everything，V2X)通信、机器类通信(machine-type communication，MTC)、物联网(internet of things，IOT)、虚拟现实、增强现实、工业控制、自动驾驶、远程医疗、智能电网、智能家具、智能办公、智能穿戴、智能交通、智慧城市等。本申请的实施例对终端设备所采用的具体技术和具体设备形态不做限定。
(R)AN设备：用于为特定区域的授权终端设备提供入网功能，并能够根据终端设备的级别，业务的需求等使用不同质量的传输隧道。
接入网设备可以是基站(base station)、演进型基站(evolved nodeB，eNodeB)、发送接收点(transmission reception point，TRP)、5G移动通信系统中的下一代基站(next generation NodeB，gNB)、6G移动通信系统中的下一代基站、未来移动通信系统中的基站或Wi-Fi系统中的接入节点等；也可以是完成基站部分功能的模块或单元，例如，可以是集中式单元(central unit，CU)，也可以是分布式单元(distributed unit，DU)。这里的CU完成基站的无线资源控制协议和分组数据汇聚层协议(packet data convergence protocol，PDCP)的功能，还可以完成业务数据适配协议(service data adaptation protocol，SDAP)的功能；DU完成基站的无线链路控制层和介质访问控制(medium access control，MAC)层的功能，还可以完成部分物理层或全部物理层的功能，有关上述各个协议层的具体描述，可以参考3GPP的相关技术规范。接入网设备可以是宏基站，也可以是微基站或室内站，还可以是中继节点或施主节点等。本申请的实施例对接入网设备所采用的具体技术和具体设备形态不做限定。为了便于描述，下文中的接入网设备均以基站为例。
基站和终端设备可以是固定位置的，也可以是可移动的。基站和终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对基站和终端设备的应用场景不做限定。
数据网络(data network，DN)：用于提供传输数据的网络。在未来通信系统中，数据网络仍可以是DN，或者，还可以有其它的名称，本申请不做限定。在5G通信系统中，终端设备接入网络后可以建立PDU会话，并通过PDU会话访问DN，可以与部署在DN中的应用功能(应用功能比如为应用服务器)交互。
接入和移动管理功能(access and mobility management function，AMF)实体(也可以称为接入与移动性管理功能、接入与移动性管理设备、接入与移动性管理网元、接入管理设备、移动管理设备)，是核心网设备的一种，主要用于移动性管理和接入管理等，可以用于实现移动性管理实体(mobility management entity，MME)功能中除会话管理之外的其它功能，例如，合法监听、或接入授权(或鉴权)、用户设备的注册、移动性管理、跟踪区更新流程、可达性检测、会话管理网元的选择、移动状态转换管理等功能。例如，在5G中，接入与移动性管理网元可以是接入与移动性管理功能(access and mobility management function，AMF)网元，在未来通信，如6G中，接入与移动性管理网元仍可以是AMF网元，或有其它的名称，本申请不做限定。当接入与移动性管理网元是AMF网元时，所述AMF可以提供Namf服务。
统一数据管理(unified data management，UDM)和统一数据存储库(unified data repository，UDR)。UDM或UDR可以是指用户数据库。可以作为一个存储用户数据的单一逻辑存储库存在。UDM用于处理终端设备标识，接入鉴权，注册以及移动性管理等。在5G通信系统中，该数据管理网元可以是UDM网元或者统一数据管理设备。在未来通信系统中，统一数据管理仍可以是UDM网元，或者，还可以有其它的名称，本申请不做限定。统一数据管理设备可以是核心网设备。
应用功能(application function，AF)：可以通过AF与5G系统交互，用于接入网络开放功能或与策略框架交互进行策略控制等。
认证服务功能(authentication server function，AUSF)：用于鉴权服务、产生密钥实现对终端设备的 双向鉴权，支持统一的鉴权框架。
图7中还展示了各网络功能实体之间的交互关系以及对应的接口。
可以理解的是，上述设备或者功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行的软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。上述设备或者功能可划分出一个或多个服务，进一步，还可能会出现独立于网络功能存在的服务。在本申请中，上述功能的实例、或上述功能中包括的服务的实例、或独立于网络功能存在的服务实例均可称为服务实例。
可以理解的是，本申请实施例并不限定于上述的系统架构，还可以应用于未来其它的通信系统，例如6G系统架构等。并且，本申请实施例上述所使用的各个设备的名称，在未来通信系统中，可能保持功能相同，但名称会改变。
终端为了获取本地化服务，需要接入hosting network。目前，当终端满足本地化服务的条件，并且处于hosting network的覆盖范围内时，终端即可执行网络重选。在这种情况下，如果终端正在执行一些业务，基于选网机制，终端将在当前网络释放所有会话，执行去注册，进入空闲态，然后重新进行选网，这就导致当前正在执行的业务将会被中断，影响业务连续性，因此如何减小或避免重新选网对当前正在进行的业务的影响，是目前需要解决的问题。
为此，本申请实施例提供了通信方法以及相关装置，用以减小重新选网操作对终端正在进行的业务的影响。
本申请实施例中，可以通过不同类型的接入网接入核心网，比如可以通过非3GPP接入网接入核心网(比如通过Wi-Fi进行接入)，也可以通过3GPP接入网接入核心网(比如通过蜂窝网络，比如基站，进行接入)。基于接入网络的不同，其接入类型也不同，比如针对通过3GPP接入的情况，对应的接入类型为3GPP接入，针对通过非3GPP接入的情况，对应的接入类型为非3GPP接入。当然，根据接入网络的不同，也可能包括更多种接入类型，本申请实施例对此不作限制。
下面结合附图，对本申请实施例进行详细描述。
参见图8，为本申请实施例提供的一种通信方法的流程示意图。该流程中，在终端满足本地化服务的条件后，网络侧对终端动态下发hosting network的选网信息。在此过程中，网络侧获取hosting network允许的接入类型，并识别终端当前接入服务网络(serving network)的接入类型，如果hosting network允许的接入类型与终端当前接入服务网络的接入类型发生冲突，则网络侧指示终端进行接入类型的切换，即从当前的接入网络切换到另一接入网络来接入该serving network，使终端在进行网络重选时，在选择hosting network进行接入时，接入hosting network的接入类型与接入serving network的接入类型不发生冲突，进而可以保证终端的业务连续性。
可以理解，本文中的“切换”可以理解为接入网的切换，比如从一种接入类型对应的接入网切换到另一种接入类型对应的接入网。以接入类型包括3GPP接入和非3GPP接入为例，所述“切换”包括从3GPP接入对应的接入网切换到非3GPP接入对应的接入网，或者从非3GPP接入对应的接入网切换到3GPP接入对应的接入网。由于通过上述切换操作，接入类型发生了变化，因此在本申请的一些实施例中，将上述“切换”简单称为接入类型的切换，比如，上述切换可以包括3GPP接入到非3GPP接入的切换，或者非3GPP接入到3GPP接入的切换。
该流程可以应用于图7所示的系统架构，此种情况下，该流程中的第一核心网设备可以是AMF，第二核心网设备可以是UDM。该流程也可以应用于演进的系统架构或其他系统架构，本申请实施例对此不作限制。
下面结合图8对该流程进行详细描述。如图8所示，该流程可以包括以下步骤：
S801：第一核心网设备确定终端满足第一本地化服务的条件。
所述第一本地化服务，可以是任意一种本地化服务。本申请实施例对第一本地化服务的类型不做限制。
在一种可能的实现方式中，若该终端满足第一本地化服务的条件为该终端进入第一本地化服务的服务区域，则当第一核心网设备确定终端移动进入第一本地化服务的服务区域时，第一核心网设备确定该终端满足第一本地化服务的条件。比如，终端通过移动性注册，更换了跟踪区(tracking area，TA)，新的TA在第一本地化服务的服务区域之内，此时第一核心网设备确定该终端满足第一本地化服务的条件。
在另一种可能的实现方式中，若该终端满足第一本地化服务的条件为达到服务开始时间，则当第一核心网设备确定达到该时间时，第一核心网设备确定该终端满足第一本地化服务的条件。
在另一种可能的实现方式中，若该终端满足第一本地化服务的条件为该终端进入第一本地化服务的服务区域并且达到服务开始时间，则当第一核心网设备确定终端移动进入第一本地化服务的服务区域并且当前达到服务开始时间时，第一核心网设备确定该终端满足第一本地化服务的条件。
S803：第一核心网设备获取该终端当前接入的网络的接入类型，以及第一网络允许的接入类型。
所述终端当前接入的网络，也称该终端当前的服务网络(serving network)，比如该服务网络可以是HPLMN。本实施例中，为方便描述，将终端当前接入的网络的接入类型称为第一接入类型。示例性的，第一接入类型可能是3GPP接入或非3GPP接入。
第一网络为用于提供第一本地化服务的网络。基于图1所示的hosting network架构，可以理解，第一网络是提供第一本地化服务的hosting network。
可以理解，第一网络允许的接入类型为第一网络可以使用的接入类型，或者说可以使用何种接入类型接入第一网络。第一网络允许的接入类型可能仅包括一种接入类型，也可能包括多种接入类型。可选的，针对不同终端，第一网络允许的接入类型可能相同也可能不同。
在一种可能的实现方式中，第一核心网设备可以根据该第一核心网设备存储的该终端的上下文，获取该终端当前接入的网络的接入类型。
在一种可能的实现方式中，第一核心网设备可以从第二核心网设备获取第一网络允许的接入类型。示例性的，第一核心网设备向第二核心网设备发送请求信息(为便于与下文中其它请求信息进行区分，这里称该请求信息为第二请求信息)，该第二请求信息包括该终端的标识和第一网络的标识；第二核心网设备基于该第二请求信息向第一核心网设备发送第二响应信息，第二响应信息中包括第一网络允许的接入类型的指示信息。可选的，第一网络允许的接入类型是指针对该终端而言的。
可选的，第一网络允许的接入类型的指示信息，可以是接入类型的标识(不同接入类型可以使用不同的标识进行区分)，也可以是一个编码值，用于指示一个或多个接入类型。比如，在接入类型的总数量为两个的情况下，该编码值可以是3比特的信息，当该编码值等于0时，表示3GPP接入，当该编码值等于1时，表示非3GPP接入，当该编码值等于2时，表示3GPP接入和非3GPP接入。本申请实施例对此不作限制。
可选的，第二请求信息中还可以包括指示信息(为便于与下文中其它指示信息进行区分，这里称该指示信息为第四指示信息)，第四指示信息用于指示第二核心网设备向第一核心网设备返回第一网络允许的接入类型，第二核心网设备可以根据该第四指示信息查询第一网络允许的接入类型，并将查询结果返回给第一核心网设备。
S804：若第一核心网设备确定第一网络允许的接入类型与第一接入类型相同，则指示该终端根据第二接入类型从所述第一接入类型对应的接入网(即当前的接入网)切换到第二接入类型对应的接入网，所述第二接入类型与所述第一接入类型不同。
第一网络允许的接入类型与第一接入类型相同的情况，包括：第一网络允许的接入类型为一个，且该接入类型与第一接入类型相同。例如，第一网络允许的接入类型为3GPP接入，第一接入类型也为3GPP接入，或者，第一网络允许的接入类型为非3GPP接入，第一接入类型也为非3GPP接入。
若第一网络允许的接入类型与第一接入类型相同，则表明第一网络允许的接入类型与终端当前接入的网络的接入类型发生冲突，这种情况下，当终端进行网络重选时有可能导致终端正在进行的业务被中断。为了保证终端的业务连续性，第一核心网设备指示该终端从当前接入网络切换到第二接入类型对应的接入网络，所述第二接入类型与所述第一接入类型不同，从而使得终端从第一接入类型对应的接入网络(即当前的接入网)切换到第二接入类型对应的接入网络，即通过第二接入类型对应的接入网络接入上述serving network。示例性的，若第一接入类型为3GPP，则第一核心网设备指示终端切换到非3GPP接入网络，如果第一接入类型为非3GPP接入网络，则第一核心网设备指示终端切换到3GPP接入网络。一种可能的实现方式中，终端从非3GPP接入切换到3GPP接入的流程可以参考图3所示的流程，由于该过程不涉及终端侧的PDU会话释放，因此可以保证终端当前正在进行的业务的连续性。一种可能的实现方式中，终端从3GPP接入切换到非3GPP接入的流程可以参考图4所示的流程，由于该过程不涉及终端侧的PDU会话释放，因此可以保证终端当前正在进行的业务的连续性。
在一种可能的实现方式中，第一核心网设备可以向该终端发送通知，该通知用于指示终端从当前第一接入类型对应的接入网切换到第二接入类型对应的接入网。可选的，该通知中还可以包括第二接入类型的指示信息。
S805：第一核心网设备确定该终端切换到第二接入类型对应的接入网后，触发核心网向该终端发送第一选网信息。
在一种可能的实现方式中，所述第一选网信息中包括第一网络的信息，比如第一网络的标识，使得终端可以根据第一选网信息选择第一网络(即第一本地化服务的hosting networ)进行接入，从而可以适应第一网络提供的本地化服务。
在另一种可能的实现方式中，所述第一选网信息还用于指示推荐给该终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括第一网络，第一网络的优先级最高，使得终端可以根据第一选网信息，优先选择第一网络(即第一本地化服务的hosting networ)进行接入，从而可以使用第一网络提供的本地化服务。可选的，所述第一选网信息为选网列表，该选网列表中包括推荐给该终端进行网络重选的一个或多个网络，其中包括优先级最高的第一网络。可选的，该选网列表中，除了第一网络以外，其它网络的优先级顺序，可以按照图2所示的优先级顺序设置。
在一种可能的实现方式中，第一核心网设备可以根据该终端的接入网络连接信息，确定该终端是否切换到第二接入类型对应的接入网，即确定该终端是否完成接入网的切换。第一核心网设备可以用于移动性管理和接入管理，因此在终端进行接入网切换的过程中，第一核心网设备可以获取到该终端的接入网连接信息(比如通过新的接入网进行会话建立的信息，对原有接入网的接入资源进行释放的信息等)，因此可以根据这些信息判断终端是否完成接入网的切换。举例来说，在终端从非3GPP接入切换到3GPP接入的过程中，第一核心网设备(比如AMF)可以获取到终端通过3GPP接入建立的新会话的相关信息，还可以获取到终端释放非3GPP接入的资源的相关信息，从而可以根据这些信息确定终端是否完成从非3GPP接入到3GPP接入的切换过程。
在另一种可能的实现方式中，第一核心网设备可以通过以下方式确定终端是否完成切换：第一核心网设备向终端发送第一指示信息，并接收该终端发送的第二指示信息。所述第一指示信息用于指示终端在完成上述切换后向第一核心网设备发送第二指示信息，所述第二指示信息用于指示终端已经完成了上述切换。
可选的，第一核心网设备可以将第一指示信息包含在用于指示终端进行接入网切换的消息中发送给终端，也可以使用单独的消息发送所述第一指示信息，本申请实施例对此不作限制。
在一种可能的实现方式中，第一核心网设备可以通过以下方式触发核心网向该终端发送第一选网信息：第一核心网设备在确定终端切换到第二接入类型对应的接入网后，第一核心网设备向第二核心网设备发送通知，以触发第二核心网设备开启SOR流程，从而可以从第二核心网设备获取第一选网信息。第一核心网设备获取到第一选网信息后，将其发送给该终端。一种可能的实现方式中，SOR流程的具体实现方式可以参考图5或图6所示的流程。
在一种可能的实现方式中，当第一核心网设备确定终端满足第一本地化服务的条件时，还可以执行以下步骤：S802：第一核心网设备获取该终端的业务状态。在S803中，若第一核心网根据该终端的业务状态确定该终端有业务正在进行，则获取第一网络允许的接入类型。
所述终端的业务状态，可以包括第一状态和第二状态，第一状态表明终端当前有业务正在进行，第二状态表明终端当前没有业务正在进行。当然，还可以根据终端正在进行的业务的类型，进一步对第一状态进行划分，本申请实施例对此不作限制。
在一种可能的实现方式中，第一核心网设备可以通过以下方式获取终端的业务状态：第一核心网设备向终端发送第一请求信息，该第一请求信息用于请求查询终端的业务状态；终端基于该第一请求信息发送第一响应信息，该第一响应信息用于指示该终端的业务状态。可选的，第一响应信息中可以包括第三指示信息，该第三指示信息用于指示终端的业务状态。
在一种可能的实现方式中，若第一核心网设备获取到该终端的业务状态后，根据该终端的业务状态确定该终端当前没有业务正在进行，则第一核心网设备跳过S803(即不执行S803)，而是直接触发核心网设备向该终端发送第一选网信息。也就是说，只有在终端当前有业务正在进行的情况下，第一核心网设备才会指示该终端切换接入网，以保证当前正在进行的业务的连续性，在终端当前没有业务正在进行的情况下，无需指示终端进行接入网的切换，从而可以节省终端侧和网络侧的开销，并可以节省信令开销。
图8所示流程中，各步骤的时序关系仅为一种示例，本申请实施例对各步骤间的时序关系不做限制。比如，第一核心网设备获取终端当前接入的网络的接入类型的步骤，也可以在S801之前。
基于图8所示的流程，当终端满足本地化服务的条件时，如果第一网络(即提供该本地化服务的网络，也即hosting network)允许的接入类型与第一接入类型(即终端当前接入的serving network的接入类型)相同，表明两者发生冲突，则第一核心网设备可以指示终端从第一接入类型对应的接入网切换到与第一接入类型不同的接入类型对应的接入网，并在切换完成后触发核心网向终端发送第一选网信息，这样，由于在终端基于选网信息进行网络重选之前，已经进行了接入类型的切换，当终端基于选网信息选择hosting network进行网络接入时，hosting network的接入类型与终端的serving network的接入类型不同，因此终端当前执行的业务不会被中断，保证了业务的连续性。
图8所示流程的一个示例，可以如图9所示。图9中各步骤的具体实现方式可以参考图8所示流程中的相关内容。如图9所示，该流程可以包括以下步骤：
步骤901：AMF确定UE满足第一本地化服务的条件。
步骤902：当UE满足第一本地化服务的条件时，AMF向UE发送第一请求信息，用于向UE发起询问，以请求获取UE的业务状态，以便确定UE当前是否有业务正在执行。
一种可能的实现方式中，AMF向UE发送NAS消息，其中包含所述第一请求信息。
步骤903：UE向AMF发送第一响应信息，用于反馈UE的业务状态，以便AMF确定该UE当前是否有业务正在进行。
一种可能的实现方式，UE向AMF发送NAS消息，其中包含所述第一响应信息。可选的，第一响应信息中包括UE的业务状态的指示信息，用于指示UE当前是否有业务正在进行。
步骤904：若UE当前有业务正在进行，则AMF向UDM请求UE想要接入的hosting network(即提供第一本地化服务的网络)允许使用的接入类型。
一种可能的实现方式，AMF向UDM发送Nudm_SDM_Get request消息，该消息中包含UE的标识、hosting network的标识，进一步的还包含用于指示UDM返回允许该UE使用的该hosting network的接入类型的指示信息(即图8所示流程中的第四指示信息)。
步骤905：UDM向AMF反馈hosting network允许的接入类型。
一种可能的实现方式，UDM向AMF发送Nudm_SDM_Get response消息，该消息包括hosting network的标识、UE的标识以及hosting network允许的接入类型的指示信息。
步骤906：AMF对hosting network允许的接入类型和UE当前接入serving network的接入类型(称为第一接入类型)进行比较，确定两者是否产生冲突，若产生冲突，则指示UE切换接入类型，即切换到另一接入网，该接入网对应的接入类型与第一接入类型不同。
例如，若第一接入类型为3GPP接入，hosting network允许的接入类型也是3GPP接入，则AMF指示UE将当前的第一接入类型(3GPP接入)切换为非3GPP接入。若第一接入类型为非3GPP接入，hosting network允许的接入类型也是非3GPP接入，则AMF指示UE将当前的第一接入类型(非3GPP接入)切换为3GPP接入。
一种可能的实现方式中，AMF向UE发送NAS消息，此消息中包含用于指示UE进行接入网切换的指示信息。
步骤907：UE执行接入类型切换过程。
步骤908：AMF通知UDM，触发UDM开启SOR流程。
一种可能的实现方式，AMF向UDM发送Namf_EventExposure_Notify消息，其中包含UE标识、hosting network的标识以及用于指示UDM触发SOR流程的指示信息。
步骤909：UDM向SOR-AF请求SOR信息。
一种可能的实现方式中，UDM向SOR-AF发送Nsoraf_SoR_Getrequest消息，该消息用于请求SOR-AF下发SOR信息。
步骤910：SOR-AF向UDM返回SOR信息。
一种可能的实现方式中，SOR-AF向UDM发送Nsoraf_SoR_Getresponse消息，该消息用于响应UDM的请求，向UDM发送SOR信息。
步骤911：UDM将SOR信息发送给AMF。
一种可能的实现方式中，UDM向AMF发送Nudm_SDM_Notification消息，该消息包含第一选网信息。可选的，第一选网信息可以包括一个选网列表，当UE使用该选网列表进行网络选择时，可以选择hosting network进行接入。
步骤912：AMF将SOR消息发送给UE。
一种可能的实现方式中，AMF通过NAS消息将SOR信息发送给UE。
步骤913：UE接收SOR信息后，根据AMF发送的SOR信息，基于选网列表进行网络重选，从而接入hosting network。
基于图9所示的流程，在网络侧动态下发选网信息时，考虑UE当前是否正在执行业务，以及hosting network允许的接入类型，若hosting network的接入类型与serving network冲突，则针对serving network切换接入类型，使hosting network可以使用不同的接入类型接入网络，从而不会对当前业务产生影响。
参见图10，为本申请实施例提供的一种通信方法的流程示意图。该流程中，在终端满足本地化服务的条件后，网络侧对终端动态下发hosting network的选网信息。在此过程中，网络侧获取hosting network允许的接入类型，并识别终端当前接入服务网络(serving network)的接入类型，如果hosting network允许的接入类型与终端当前接入服务网络的接入类型不发生冲突或者可能发生/不发生冲突，则指示终端使用与当前接入serving network的接入类型不同的接入类型来接入hosting network，从而使终端在进行网络重选时，在选择hosting network进行接入时，接入hosting network的接入类型与接入serving network的接入类型不发生冲突，进而可以保证终端的业务连续性。
该流程可以应用于图7所示的系统架构，此种情况下，该流程中的第一核心网设备可以是AMF，第二核心网设备可以是UDM。该流程也可以应用于演进的系统架构或其他系统架构，本申请实施例对此不作限制。
下面结合图10对该流程进行详细描述。如图10所示，该流程可以包括以下步骤：
S1001：第一核心网设备确定终端满足第一本地化服务的条件。
该步骤的具体实现方式，可以参考图8所示流程中的相关内容。
S1003：第一核心网设备获取该终端当前接入的网络的接入类型，以及第一网络允许的接入类型。
该步骤的具体实现方式，可以参考图8所示流程中的相关内容。
S1005：若第一网络允许的接入类型中包括第二接入类型，则第一核心网设备触发核心网向该终端发送第二选网信息，所述第二选网信息用于指示所述第二接入类型。所述第一接入类型和所述第二接入类型不同。
可以理解，所述第二选网信息指示的第二接入类型，是应用于第一网络的，即，终端根据第二选网信息，通过与第二接入类型对应的接入网来接入第一网络。
在一种可能的场景中，第一网络允许的接入类型仅为一个，且与第一接入类型不同，即第一网络允许的接入类型为上述第二接入类型。这种情况表明第一网络允许的接入类型与终端当前接入服务网络的接入类型不发生冲突。例如，第一网络允许的接入类型为3GPP接入，第一接入类型为非3GPP接入；又例如，第一网络允许的接入类型为非3GPP接入，第一接入类型为3GPP接入。
在另一种可能的场景中，第一网络允许的接入类型为多个，其中包括一个与第一接入类型不同的第二接入类型。这种情况表明第一网络允许的接入类型与终端当前接入服务网络的接入类型有可能发生冲突，或者说有可能不发生冲突。例如，第一网络允许的接入类型包括3GPP接入和非3GPP接入，第一接入类型为非3GPP接入。
针对上述各种场景，本申请实施例中，第一核心网设备发送给终端的第二选网信息指示与第一接入类型不同的第二接入类型，可以使得终端接入第一网络的接入类型与接入serving network的接入类型不发生冲突，进而可以保证终端的业务连续性。
在一种可能的实现方式中，所述第二选网信息中包括第一网络的信息，比如第一网络的标识，使得终端可以根据第二选网信息选择第一网络(即第一本地化服务的hosting networ)进行接入，从而可以适应第一网络提供的本地化服务。
在另一种可能的实现方式中，所述第二选网信息还用于指示推荐给该终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括第一网络，第一网络的优先级最高，使得终端可以根据第二选网信息，优先选择第一网络(即第一本地化服务的hosting networ)进行接入，从而可以使用第一网络提供的本地化服务。可选的，该至少一个网络中，除了第一网络以外，其它网络的优先级顺序，可以按照图2所示的优先级顺序设置。
可选的，所述第二选网信息为选网列表，该选网列表中包括推荐给该终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，该至少一个网络中包括优先级最高的第一网络，以及用于指示第 一网络的接入类型的信息。本实施例中，该信息用于指示第二接入类型，即该信息用于指示第一网络的接入类型为第二接入类型。示例性的，该选网列表的一个示例如表1所示。
表1：选网列表的示例：
其中，优先级ID从高到低的顺序为：1,2,3……。
在一种可能的实现方式中，第一核心网设备可以通过以下方式触发核心网向该终端发送第二选网信息：第一核心网设备向第二核心网设备发送该终端的标识、第一网络的标识、第二接入类型的指示信息；第二核心网设备根据该终端的标识、第一网络的标识获取该终端对应的选网列表，比如，将该终端的标识和第一网络的标识发送给SOR-AF，并从SOR-AF接收对应的选网列表，该选网列表中包括第一网络的标识，并且第一网络的优先级最高；第二核心网设备根据该选网列表以及第二接入类型的指示信息生成第二选网信息，比如第二核心网设备可以将第二接入类型的指示信息添加到该选网列表中，得到第二选网信息，第二选网信息的一个示例可参见表1；第二核心网设备将第二选网信息发送给第一核心网设备；第一核心网设备将第二选网信息发送给终端。
可选的，第一核心网设备还将第五指示信息发送给第二核心网设备，所述第五指示信息用于指示第二核心网设备根据第二接入类型的指示信息以及该终端对应的选网列表生成第二选网信息，比如指示第二核心网设备将第二接入类型的指示信息添加到该终端的选网列表中。
第一核心网设备向第二核心网设备发送通知，以触发第二核心网设备开启SOR流程，从而可以从第二核心网设备获取第二选网信息。第一核心网设备获取到第二选网信息后，将其发送给该终端。一种可能的实现方式中，SOR流程的具体实现方式可以参考图5或图6所示的流程。
在一种可能的实现方式中，当第一核心网设备确定终端满足第一本地化服务的条件时，还可以执行以下步骤：S1002：第一核心网设备获取该终端的业务状态。在S1003中，若第一核心网根据该终端的业务状态确定该终端有业务正在进行，则获取第一网络允许的接入类型。可选的，第一核心网设备获取终端的业务状态的实现方式，可以参考图8所示流程中的相关内容。
在一种可能的实现方式中，若第一核心网设备获取到该终端的业务状态后，根据该终端的业务状态确定该终端当前没有业务正在进行，则第一核心网设备触发核心网设备向该终端发送第三选网信息。所述第三选网信息包括第一网络的信息，比如第一网络的标识，使得终端可以根据第二选网信息选择第一网络(即第一本地化服务的hosting networ)进行接入，从而可以适应第一网络提供的本地化服务。
可选的，所述第三选网信息还用于指示推荐给该终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括第一网络，第一网络的优先级最高，使得终端可以根据第二选网信息，优先选择第一网络(即第一本地化服务的hosting networ)进行接入，从而可以使用第一网络提供的本地化服务。可选的，该至少一个网络中，除了第一网络以外，其它网络的优先级顺序，可以按照图2所示的优先级顺序设置。
图10所示流程中，各步骤的时序关系仅为一种示例，本申请实施例对各步骤间的时序关系不做限制。比如，第一核心网设备获取终端当前接入的网络的接入类型的步骤，也可以在S1001之前。
基于图10所示的流程，当终端满足本地化服务的条件时，如果第一网络(hosting network，即提供该本地化服务的网络)允许的接入类型中包括与第一接入类型(即终端当前接入的serving network的接入类型)不同的第二接入类型，表明两者不发生冲突或者可能发生/不发生冲突，则第一核心网设备可以触发核心网向所述终端发送选网信息，所述选网信息用于指示第二接入类型，这样，当终端基于该选网信息选择hosting network后，根据该第二接入类型，通过第二接入类型对应的接入网接入hosting network，从而可以保证hosting network的接入类型与该终端的serving network的接入类型不同，因此终端当前执行的业务不会被中断，保证了业务的连续性。
图10所示流程的一个示例，可以如图11所示。图11中各步骤的具体实现方式可以参考图10所示流程中的相关内容。如图11所示，该流程可以包括以下步骤：
步骤1101：AMF确定UE满足第一本地化服务的条件。
步骤1102：当UE满足第一本地化服务的条件时，AMF向UE发送第一请求信息，用于向UE发起询问，以请求获取UE的业务状态，以便确定UE当前是否有业务正在执行。
一种可能的实现方式中，AMF向UE发送NAS消息，其中包含所述第一请求信息。
步骤1103：UE向AMF发送第一响应信息，用于反馈UE的业务状态，以便AMF确定该UE当前是否有业务正在进行。
一种可能的实现方式，UE向AMF发送NAS消息，其中包含所述第一响应信息。可选的，第一响应信息中包括UE的业务状态的指示信息，用于指示UE当前是否有业务正在进行。
步骤1104：若UE当前有业务正在进行，则AMF向UDM请求UE想要接入的hosting network(即提供第一本地化服务的网络)允许使用的接入类型。
一种可能的实现方式，AMF向UDM发送Nudm_SDM_Get request消息，该消息中包含UE的标识、hosting network的标识，进一步的还包含用于指示UDM返回允许该UE使用的该hosting network的接入类型的指示信息。
步骤1105：UDM向AMF反馈hosting network允许的接入类型。
一种可能的实现方式，UDM向AMF发送Nudm_SDM_Get response消息，该消息包括hosting network的标识、UE的标识以及hosting network允许的接入类型的指示信息。
步骤1106：AMF对hosting network允许的接入类型和UE当前接入servingnetwork的接入类型(称为第一接入类型)进行比较，确定两者是否产生冲突，若不产生冲突，则AMF通知UDM开启SOR流程。
例如，若第一接入类型为3GPP接入，hosting network允许的接入类型是非3GPP接入，则两者不产生冲突，AMF通知UDM开启SOR流程。若第一接入类型为非3GPP接入，hosting network允许的接入类型是3GPP接入，则两者不产生冲突，AMF通知UDM开启SOR流程。
一种可能的实现方式，AMF向UDM发送Namf_EventExposure_Notify消息，其中包含UE标识、hosting network的标识，还可以包含第二接入类型的指示信息(第二接入类型与上述第一接入类型不同)，进一步的，还可以包含用于指示UDM触发SOR流程的指示信息。
步骤1107：UDM向SOR-AF请求SOR信息。
一种可能的实现方式中，UDM向SOR-AF发送Nsoraf_SoR_Getrequest消息，该消息用于请求SOR-AF下发SOR信息。
步骤1108：SOR-AF向UDM返回SOR信息。
一种可能的实现方式中，SOR-AF向UDM发送Nsoraf_SoR_Getresponse消息，该消息用于响应UDM的请求，向UDM发送SOR信息。
步骤1109：UDM将SOR信息发送给AMF。
一种可能的实现方式中，UDM向AMF发送Nudm_SDM_Notification消息，该消息包含第二选网信息。可选的，第二选网信息可以包括一个选网列表，该选网列表中包括第二接入类型的指示信息，当UE使用该选网列表进行网络选择时，可以选择hosting network并根据第二接入类型进行网络接入。
步骤1110：AMF将SOR消息发送给UE。
一种可能的实现方式中，AMF通过NAS消息将SOR信息发送给UE。
步骤1111：UE接收SOR信息后，根据AMF发送的SOR信息，基于选网列表进行网络重选，从而选择hosting network并根据第二接入类型进行网络接入。
基于图11所示的流程，在网络侧动态下发选网信息时，考虑UE当前是否正在执行业务，以及hosting network允许的接入类型，当hosting network可以采用与当前serving network不同的接入类型接入网络时，则不会对当前业务产生影响。
在一种可能的实现方式中，图8所示的流程以及图10所示的流程可以结合使用。换言之，当第一核心网设备确定终端满足第一本地化服务的条件时，若确定第一网络允许的接入类型与所述第一接入类型相同，则参照图8所示的流程执行相关步骤；若第一网络允许的接入类型中包括第二接入类型，则参照图10所示的流程执行相关步骤。
本申请另外的一些实施例还提供了一种通信方法，该方法中，针对选网信息动态下发的情况，通过增强选网信息的下发条件，以避免终端当前正在进行的业务被中断。比如，当第一核心网设备确定终端 满足本地化服务的条件且当前没有业务正在执行时，才触发核心网向终端下发选网信息，使得终端可以选择hosting network进行网络接入。
在一种可能的实现方式中，当第一核心网设备确定终端满足第一本地化服务的条件时，指示终端不存在正在进行的业务时通知第一核心网设备；第一核心网设备接收到该终端发送的用于通知该终端不存在正在进行的业务的指示信息后，触发核心网向该终端发送选网信息。
可选的，所述选网信息包括第一网络的信息，所述第一网络为提供所述第一本地化服务的网络。
可选的，所述选网信息用于指示推荐给终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括第一网络(即提供所述第一本地化服务的网络)，所述第一网络的优先级最高。
该流程可以应用于图7所示的系统架构，此种情况下，该流程中的第一核心网设备可以是AMF，第二核心网设备可以是UDM。该流程也可以应用于演进的系统架构或其他系统架构，本申请实施例对此不作限制。
图12示例性的示出了上述流程的一种可能的实现方法。该流程中，在终端满足本地化服务的条件后，网络侧对终端动态下发hosting network的选网信息。在此过程中，网络侧在确定终端没有业务进行时，才触发核心网向该终端发送选网信息。
如图12所示，该流程可以包括以下步骤：
步骤1201：AMF确定UE满足本地化服务的条件。
第一核心网设备确定UE是否满足本地化服务的条件的具体实现方式，可以参考图8所示流程中的相关内容。
步骤1202：当UE满足本地化服务的条件时，AMF向UE发送指示信息，该信息指示用于指示UE在当前业务全部结束后向AMF进行反馈。
该步骤中，若UE当前有业务正在进行，则UE可以等待正在进行的业务全部结束后，向AMF进行反馈；若UE当前没有业务正在进行，则可以在收到指示信息后立即向AMF进行反馈。
一种可能的实现方式中，该指示信息可以是通过下行NAS消息发送给UE，例如UE通过移动性注册触发该流程时，AMF可以在注册接受消息中包含该指示信息。
步骤1203：UE根据接收到的指示信息，当结束当前的所有业务后，向AMF进行反馈，用以通知AMF该UE当前没有业务正在进行。
一种可能的实现方式，UE可以通过NAS消息向AMF反馈该信息。
步骤1204：AMF向UDM发送通知，指示当前UE已经满足重新选网的条件，触发UDM开启SOR流程。
一种可能的实现方式，AMF向UDM发送Namf_EventExposure_Notify消息，其中包含UE当前满足本地化服务的信息、本地化服务的标识以及hosting network的标识(该hosting network即为提供该本地化服务的网络)。
步骤1205：UDM向SOR-AF请求SOR信息。
一种可能的实现方式，UDM向SOR-AF发送Nsoraf_SoR_Get request消息，该消息用于请求SOR-AF下发SOR信息。
步骤1206：SOR-AF向UDM返回SOR信息。
一种可能的实现方式，SOR-AF向UDM发送Nsoraf_SoR_Get response消息，该消息用于响应UDM的请求，向UDM发送SOR信息。
步骤1207：UDM将SOR信息下发给AMF。
一种可能的实现方式，UDM向AMF发送Nudm_SDM_Notification消息，该消息包含选网列表，该选网列表中包括hosting network的标识，且该hosting network的优先级最高，当UE根据该选网列表进行选网时，可以选择hosting network进行接入。
步骤1208：AMF将SOR消息下发给UE。
一种可能的实现方式，AMF通过NAS消息将SOR信息发送给UE，其中包含上述选网列表。
步骤1209：UE接收SOR信息后，根据AMF下发的SOR消息，根据该选网列表进行网络重选，从而接入hosting network。
上述流程中，在网络侧动态下发选网信息的条件上进行了强化，在原有的需要满足本地化服务对应 的条件之外，增加了需要UE当前没有业务正在执行的条件。当UE满足本地化服务对应的条件后，网络侧不会立即发送hosting network的选网信息，而是会等待UE当前的所有业务都结束后再下发选网信息。通过额外的条件限制了UE在有业务执行时不重新选网，从而避免了对UE当前业务的影响。
本申请的一些实施例还提供了一种通信方法，该方法中，针对选网信息预配置到终端上的情况，可以由终端自身判断当前是否有业务正在进行，若有业务正在进行，则终端通过与用户交互，获得用户的选择，根据用户的选择确定是否开启网络重选。若用户选择开启网络重选，则终端在等待正在使用的业务全部结束后才开启网络重选，从而根据预配置的选网列表重新进行选网。
可选的，在终端上预配置的选网信息，可以包括但不限于本地化服务的标识、本地化服务的条件和用于选择hosting network的选网列表。可选的，本地化服务的条件可以是基于本地化服务要求的服务地点的条件，或者是基于本地化服务的服务起始时间的条件，还可以是基于服务地点和服务起始时间的条件。可选的，该选网列表中包括hosting network的标识，可选的，hosting network的优先级最高。
图13示例性示出了该方法的一种可能的实现流程。如图所示，该流程可以包括以下步骤：
S1301：终端确定满足第一本地化服务的条件。
判断是否满足本地化服务的条件的方法，与前述实施例基本相同，不同之处在于，由于本地化服务的条件的相关信息预配置在终端上，因此终端自身可以确定该终端是否满足本地化服务的条件。
S1302：当终端确定满足第一本地化服务的条件时，确定当前是否有业务正在进行，若有业务正在进行，则转入S1303，否则转入S1306。
S1303：终端通过与用户交互，获取用户的选择，所述用户的选择，包括同意切换接入类型，或者不同意切换接入类型。若用户同意切换接入类型，则转入S1304，否则转入S1305。
可选的，终端可以提供用于获取用户选择的用户界面，该用户界面可以提供同意切换接入类型的选项以及不同意切换接入类型的选项，用户可以通过人机交互，向终端提交自己的选择。
终端也可以通过其它方式获得用户的选择，比如通过语音询问的方式，根据接收到的用户应答语音，识别用户是否同意切换接入类型。
S1304：终端从第一接入类型(即终端当前接入网络的接入类型)对应的接入网切换到第二接入类型对应的接入网，并在完成切换后根据预配置的选网信息进行网络重选，所述第二接入类型与所述第一接入类型不同。
例如，如果第一接入类型为非3GPP接入，则终端可以通过执行图3所示的流程，切换到3GPP接入；如果第一接入类型为3GPP接入，则终端可以通过执行图4所示的流程，切换到非3GPP接入。
S1305：终端在当前正在执行的业务结束后，根据预配置的选网信息进行网络重选。
该步骤中，若当前有业务正在执行，则终端可以暂时关闭自动选网，等待业务结束后，根据预配置的选网信息进行网络重选。终端也可以在等待业务结束后，由用户通过手动方式进行网络重选，比如，用户可以从预配置的选网列表中选择需要接入的网络。
S1306：终端根据预配置的选网信息进行网络重选。
上述流程中，UE在满足本地化服务的条件之后，需要额外对UE当前是否执行serving network中的业务做判断。当UE正在执行serving network中的业务时，则关闭自动选网，或是与用户交互询问用户是否需要进行接入类型的切换。通过上述流程可以避免在UE进行网络重选时，中断UE当前正在执行的业务，减小对当前业务的影响。
本申请的一些实施例还提供了一种通信方法，该方法中，针对选网信息预配置到终端上的情况，在网络重选时，通过选择与当前接入类型不同的接入类型来接入选择的网络，以减小或避免选网对当前业务的影响。
可选的，在终端上预配置的选网信息，可以包括但不限于本地化服务的标识、本地化服务的条件和用于选择hosting network的选网列表。可选的，本地化服务的条件可以是基于本地化服务要求的服务地点的条件，或者是基于本地化服务的服务起始时间的条件，还可以是基于服务地点和服务起始时间的条件。可选的，该选网列表中包括hosting network的标识，可选的，hosting network的优先级最高。
在一种可能的实现方式中，当终端确定满足第一本地化服务的条件时，获取终端当前接入的网络的接入类型(以下称为第一接入类型)以及第一网络(即用于提供所述第一本地化服务的网络)允许的接入类型；若第一网络允许的接入类型与第一接入类型相同，则终端从第一接入类型对应的接入网切换到第二接入类型(第二接入类型与第一接入类型不同)对应的接入网，并在切换到第二接入类型对应的接 入网后，根据预配置的选网信息进行网络重选。由于预配置的选网信息中包括第一网络，则终端可以选择第一网络进行接入，用以使用第一本地化服务。
可选的，若第一网络允许的接入类型中包括第二接入类型，则终端根据预配置的选网信息进行网络重选。由于预配置的选网信息中包括第一网络，则终端可以选择第一网络进行接入，用以使用第一本地化服务。
该流程可以应用于图7所示的系统架构，此种情况下，该流程中的第一核心网设备可以是AMF，第二核心网设备可以是UDM。该流程也可以应用于演进的系统架构或其他系统架构，本申请实施例对此不作限制。
图14示例性的示出了上述流程的一种可能的实现方法。在UE选网信息预配置的情况下，通过UE对hosting network的接入类型的判断，与当前serving network的接入类型进行比较，决定UE通过哪种接入类型接入hosting network，从而减小对当前业务的影响。该流程可以包括以下步骤：
步骤1401：UE根据预配置的本地化服务信息，判断满足第一本地化服务的条件。
步骤1402：UE将hosting network(即第一网络，用于提供第一本地化服务)允许的接入类型和第一接入类型(即UE当前正在使用的serving network的接入类型)进行比较，如果两者发生冲突，则执行步骤1403，否则执行步骤1404。
可选的，若hosting network允许的接入类型与第一接入类型相同，则表明两者发生冲突。例如，如果hosting network仅能通过3GPP接入，而第一接入类型也是3GPP接入；或者，如果hosting network仅能通过非3GPP接入，而第一接入类型也是非3GPP接入。
可选的，若hosting network允许的接入类型中包括第二接入类型(第二接入类型与第一接入类型不同)，则表明两者不发生冲突，或者有可能不发生冲突。
步骤1403：终端从第一接入类型对应的接入网切换到第二接入类型对应的接入网，即执行接入类型切换。并在切换到第二接入类型对应的接入网后，根据预配置的选网信息进行网络重选。
例如，如果第一接入类型为非3GPP接入，则终端可以通过执行图3所示的流程，切换到3GPP接入；如果第一接入类型为3GPP接入，则终端可以通过执行图4所示的流程，切换到非3GPP接入。
终端完成接入类型切换后，serving network和hosting network使用的接入类型不同，因此不会产生冲突，此时UE根据预配置的选网信息进行网络重选，以接入hosting network。
步骤1404：UE根据预配置的选网信息进行网络重新，在选择hosting network后，根据第二接入类型，通过第二接入类型对应的接入网接入hosting network。
上述流程通过对hosting network允许的接入类型与UE当前的serving network的接入类型进行对比，若产生冲突，则将当前serving network的接入网，从而实现接入类型的切换，使当前serving network的接入类型与hosting network允许的类型不同。当二者不产生冲突时，UE重新选择网络接入hosting network时，不会影响serving network的连接。因此，采用上述流程可以在UE重新选网接入hosting network时，避免对当前serving network中的业务产生影响。
基于相同的技术构思，本申请实施例还提供了一种通信装置，如图15所示，该通信装置1500可以包括处理单元1501和收发单元1502。
在一种可能的实现方式中，通信装置1500可以实现图8或图9中第一核心网设备的功能。示例性的，处理单元1500用于：当确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；若所述第一网络允许的接入类型与所述第一接入类型相同，则通过收发单元1502指示所述终端从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，所述第二接入类型与所述第一接入类型不同；以及确定所述终端切换到所述第二接入类型对应的接入网后，触发核心网向所述终端发送第一选网信息。
在另一种可能的实现方式中，通信装置1500可以实现图10或图11中第一核心网设备的功能。示例性的，处理单元1501用于：当确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；以及，若所述第一网络允许的接入类型中包括第二接入类型，所述第二接入类型与所述第一接入类型不同，则触发核心网向所述终端发送选网信息，所述选网信息用于指示所述第二接入类型。
在另一种可能的实现方式中，通信装置1500可以实现图12中第一核心网设备的功能。示例性的，处理单元1501用于：当确定终端满足第一本地化服务的条件时，通过收发单元1502指示所述终端不存在正在进行的业务时通知所述第一核心网设备；通过收发单元1502接收所述终端发送的用于通知所述终端不存在正在进行的业务的指示信息后，触发核心网向所述终端发送选网信息。
在另一种可能的实现方式中，通信装置1500可以实现图13中的终端的功能。示例性的，处理单元1501用于：确定满足第一本地化服务的条件时，确定所述终端当前是否有业务正在进行；若当前有业务正在进行，则根据用户的选择确定是否切换接入类型，若确定切换接入类型，则从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，并在完成切换后根据选网信息进行网络重选，所述第二接入类型与所述第一接入类型不同。
在另一种可能的实现方式中，通信装置1500可以实现图14中的终端的功能。示例性的，处理单元1501用于：当确定满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；若所述第一网络允许的接入类型与所述第一接入类型相同，则从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，并在切换到所述第二接入类型对应的接入网后，选择所述第一网络进行接入；其中，所述第二接入类型与所述第一接入类型不同。
可以理解，本申请实施例提供的上述通信装置，能够实现上述方法实施例中相应设备所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
上述通信装置1500能够实现上述方法实施例中的方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
为便于理解，图16中仅示出了通信装置1600执行本申请所示方法所需的结构，本申请并不限制通信装置可具备更多组件。该通信装置1600可用于执行上述方法实施例中相关设备执行的步骤，比如所述相关设备可以是第一核心网设备(如AMF)，或者终端等。
该通信装置1600可包括收发器1601、存储器1603以及处理器1602，收发器1601、存储器1603以及处理器1602可以通过总线1604连接。该收发器1601可以用于通信装置进行通信，如用于发送或接收信号。该存储器1603与所述处理器1602耦合，可用于保存通信装置1600实现各功能所必要的程序和数据。以上存储器1603以及处理器1602可集成于一体也可相互独立。
示例性的，该收发器1601可以是通信端口，如网元之间用于通信的通信端口(或称接口)。收发器1601也可被称为收发单元或通信单元。该处理器1602可通过处理芯片或处理电路实现。收发器1601可采用无线方式或有线方式进行信息接收或发送。
另外，根据实际使用的需要，本申请实施例提供的通信装置可包括处理器，由该处理器调用外接的收发器和/或存储器以实现上述功能或步骤或操作。通信装置也可包括存储器，由处理器调用并执行存储器中存储的程序实现上述功能或步骤或操作。或者，通信装置也可包括处理器及收发器(或通信接口)，由处理器调用并执行外接的存储器中存储的程序实现上述功能或步骤或操作。或者，通信装置也可包括处理器、存储器以及收发器。
基于与上述方法实施例相同构思，本申请实施例中还提供一种计算机可读存储介质，其上存储有程序指令(或称计算机程序、指令)，该程序指令被处理器执行时，使该计算机执行上述方法实施例、方法实施例的任意一种可能的实现方式中由第一网元。无线接入网或策略控制功能执行的操作。
基于与上述方法实施例相同构思，本申请还提供一种计算机程序产品，包括程序指令，该计算机程序产品在被计算机调用执行时，可以使得计算机实现上述方法实施例、方法实施例的任意一种可能的实现方式中由第一网元。无线接入网或策略控制功能执行的操作。
基于与上述方法实施例相同构思，本申请还提供一种芯片或芯片系统，该芯片与收发器耦合，用于实现上述方法实施例、方法实施例的任意一种可能的实现方式中由第一网元。无线接入网或策略控制功能执行的操作。该芯片系统可包括该芯片，以及包括存储器、通信接口等组件。
基于与上述方法实施例相同构思，本申请实施例还提供一种通信系统。可选的，所述通信系统包括第一核心网设备和第二核心网设备，所述第一核心网设备可以执行图8或图9中第一核心网设备的操作，第二核心网设备可以执行图8或图9中第二核心网设备的操作。
基于与上述方法实施例相同构思，本申请实施例还提供一种通信系统。可选的，所述通信系统包括 第一核心网设备和第二核心网设备，所述第一核心网设备可以执行图10或图11中第一核心网设备的操作，第二核心网设备可以执行图10或图11中第二核心网设备的操作。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的保护范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (30)

  1. 一种通信方法，其特征在于，包括：
    当第一核心网设备确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；
    若所述第一网络允许的接入类型与所述第一接入类型相同，则所述第一核心网设备指示所述终端从所述第一接入类型对应的接入网切换到第二接入类型对应的接入网，所述第二接入类型与所述第一接入类型不同；
    所述第一核心网设备确定所述终端切换到所述第二接入类型对应的接入网后，触发核心网向所述终端发送第一选网信息。
  2. 如权利要求1所述的方法，其特征在于，所述第一核心网设备确定所述终端切换到所述第二接入类型对应的接入网，包括：
    所述第一核心网设备向所述终端发送第一指示信息，并接收所述终端发送的第二指示信息，所述第一指示信息用于指示所述终端在完成所述切换后向所述第一核心网设备发送所述第二指示信息，所述第二指示信息用于指示所述终端完成所述切换；或者
    所述第一核心网设备根据所述终端的接入网连接信息，确定所述终端切换到所述第二接入类型对应的接入网。
  3. 如权利要求1-2任一项所述的方法，其特征在于，当所述第一核心网设备确定所述终端满足第一本地化服务的条件时，所述方法还包括：
    所述第一核心网设备获取所述终端的业务状态；
    所述获取所述第一网络允许的接入类型，包括：
    若所述终端的业务状态表明所述终端有业务正在进行，则所述第一核心网设备获取所述第一网络允许的接入类型。
  4. 如权利要求3所述的方法，其特征在于，所述第一核心网设备获取所述终端的业务状态，包括：
    所述第一核心网设备向所述终端发送第一请求信息，所述第一请求信息用于请求查询所述终端的业务状态；
    所述第一核心网设备接收所述终端基于所述第一请求信息发送的第一响应信息，所述第一响应信息用于指示所述终端的业务状态。
  5. 如权利要求4所述的方法，其特征在于，所述第一响应消息中包括第三指示信息，所述第三指示信息用于指示所述终端的业务状态。
  6. 如权利要求1-5任一项所述的方法，其特征在于，所述第一核心网设备获取所述第一网络允许的接入类型，包括：
    所述第一核心网设备向第二核心网设备发送第二请求信息，所述第二请求信息包括所述终端的标识和所述第一网络的标识；
    所述第一核心网设备接收所述第二核心网设备基于所述第二请求信息发送的第二响应信息，所述第二响应信息包括所述第一网络允许的接入类型的指示信息。
  7. 如权利要求6所述的方法，其特征在于，所述第二请求信息还包括第四指示信息，所述第四指示信息用于指示所述第二核心网设备向所述第一核心网设备返回所述第一网络允许的接入类型。
  8. 如权利要求1-7任一项所述的方法，其特征在于，当第一核心网设备确定终端满足第一本地化服务的条件时，所述方法还包括：
    若所述第一网络允许的接入类型中包括第二接入类型，所述第二接入类型与所述第一接入类型不同，则所述第一核心网设备触发核心网向所述终端发送第二选网信息，所述第二选网信息用于指示所述第二接入类型。
  9. 如权利要求8所述的方法，其特征在于，所述第二选网信息包括所述第一网络的信息。
  10. 如权利要求8所述的方法，其特征在于，所述第二选网信息还用于指示推荐给所述终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括所述第一网络，所述第一网络的优先级最高。
  11. 如权利要求10所述的方法，其特征在于，所述第二选网信息包括选网列表，所述选网列表中包括所述推荐给所述终端进行网络重选的至少一个网络以及用于指示所述第一网络的接入类型的信息。
  12. 如权利要求8-11任一项所述的方法，其特征在于，所述第一核心网设备触发核心网向所述终端发送第二选网信息，包括：
    所述第一核心网设备向第二核心网设备发送所述终端的标识、所述第一网络的标识、所述第二接入类型的指示信息；其中，所述第二核心网设备用于根据所述终端的标识、所述第一网络的标识获取所述终端对应的选网列表，并根据所述选网列表以及所述第二接入类型的指示信息生成所述第二选网信息；
    所述第一核心网设备接收所述第二核心网设备发送的所述第二选网信息；
    所述第一核心网设备将所述第二选网信息发送给所述终端。
  13. 如权利要求12所述的方法，其特征在于，所述第一核心网设备还将第五指示信息发送给所述第二核心网设备，所述第五指示信息用于指示所述第二核心网设备根据所述第二接入类型的指示信息以及所述终端对应的选网列表生成所述第二选网信息。
  14. 如权利要求1-13任一项所述的方法，其特征在于，所述第一接入类型为3GPP接入类型，所述第二接入类型为非3GPP接入类型；或者，所述第一接入类型为非3GPP接入类型，所述第二接入类型为3GPP接入类型。
  15. 一种通信方法，其特征在于，包括：
    当第一核心网设备确定终端满足第一本地化服务的条件时，获取所述终端当前接入的网络的接入类型以及第一网络允许的接入类型，所述第一网络为用于提供所述第一本地化服务的网络，所述终端当前接入的网络的接入类型为第一接入类型；
    若所述第一网络允许的接入类型中包括第二接入类型，所述第二接入类型与所述第一接入类型不同，则所述第一核心网设备触发核心网向所述终端发送选网信息，所述选网信息用于指示所述第二接入类型。
  16. 如权利要求15所述的方法，其特征在于，所述选网信息包括所述第一网络的信息。
  17. 如权利要求15所述的方法，其特征在于，所述选网信息还用于指示推荐给所述终端进行网络重选的至少一个网络以及所述至少一个网络的优先级，所述至少一个网络中包括所述第一网络，所述第一网络的优先级最高。
  18. 如权利要求17所述的方法，其特征在于，所述选网信息包括选网列表，所述选网列表中包括所述推荐给所述终端进行网络重选的至少一个网络以及用于指示所述第一网络的接入类型的信息。
  19. 如权利要求15-18任一项所述的方法，其特征在于，所述第一核心网设备触发核心网向所述终端发送选网信息，包括：
    所述第一核心网设备向第二核心网设备发送所述终端的标识、所述第一网络的标识、所述第二接入类型的指示信息；其中，所述第二核心网设备用于根据所述终端的标识、所述第一网络的标识获取所述终端对应的选网列表，并根据所述选网列表以及所述第二接入类型的指示信息生成所述选网信息；
    所述第一核心网设备接收所述第二核心网设备发送的所述选网信息；
    所述第一核心网设备将所述选网信息发送给所述终端。
  20. 如权利要求19所述的方法，其特征在于，所述第一核心网设备还将第五指示信息发送给所述第二核心网设备，所述第五指示信息用于指示所述第二核心网设备根据所述第二接入类型的指示信息以及所述终端对应的选网列表生成所述选网信息。
  21. 如权利要求15-20任一项所述的方法，其特征在于，当所述第一核心网设备确定所述终端满足第一本地化服务的条件时，所述方法还包括：
    所述第一核心网设备获取所述终端的业务状态；
    所述获取所述第一网络允许的接入类型，包括：
    若所述终端的业务状态表明所述终端有业务正在进行，则所述第一核心网设备获取所述第一网络允许的接入类型。
  22. 如权利要求21所述的方法，其特征在于，所述第一核心网设备获取所述终端的业务状态，包括：
    所述第一核心网设备向所述终端发送第一请求信息，所述第一请求信息用于请求查询所述终端的业务状态；
    所述第一核心网设备接收所述终端基于所述第一请求信息发送的第一响应信息，所述第一响应信息用于指示所述终端的业务状态。
  23. 如权利要求22所述的方法，其特征在于，所述第一响应消息中包括第三指示信息，所述第三指示信息用于指示所述终端的业务状态。
  24. 如权利要求15-23任一项所述的方法，其特征在于，所述第一核心网设备获取所述第一网络允许的接入类型，包括：
    所述第一核心网设备向第二核心网设备发送第二请求信息，所述第二请求信息包括所述终端的标识和所述第一网络的标识；
    所述第一核心网设备接收所述第二核心网设备基于所述第二请求信息发送的第二响应信息，所述第二响应信息包括所述第一网络允许的接入类型的指示信息。
  25. 如权利要求24所述的方法，其特征在于，所述第二请求信息还包括第四指示信息，所述第四指示信息用于指示所述第二核心网设备向所述第一核心网设备返回所述第一网络允许的接入类型。
  26. 如权利要求15-25任一项所述的方法，其特征在于，所述第一接入类型为3GPP接入类型，所述第二接入类型为非3GPP接入类型；或者，所述第一接入类型为非3GPP接入类型，所述第二接入类型为3GPP接入类型。
  27. 一种通信装置，其特征在于，包括：一个或多个处理器；其中，当一个或多个计算机程序的指令被所述一个或多个处理器执行时，使得所述通信装置执行如权利要求1-14中任一项所述的方法，或者执行如权利要求15-26中任一项所述的方法。
  28. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括计算机程序，当计算机程序在计算设备上运行时，使得所述计算设备执行如权利要求1-14中任一项所述的方法，或者执行如权利要求15-26中任一项所述的方法。
  29. 一种芯片，其特征在于，所述芯片与存储器耦合，用于读取并执行所述存储器中存储的程序指令，以实现如权利要求1-14中任一项所述的方法，或者实现如权利要求15-26中任一项所述的方法。
  30. 一种计算机程序产品，其特征在于，所述计算机程序产品在被计算机调用时，使得所述计算机执行如权利要求1-14中任一项所述的方法，或者执行如权利要求15-26中任一项所述的方法。
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