WO2018145252A1

WO2018145252A1 - Method for network reselection and device

Info

Publication number: WO2018145252A1
Application number: PCT/CN2017/073073
Authority: WO
Inventors: 王远; 周润泽; 陈中平
Original assignee: 华为技术有限公司
Priority date: 2017-02-07
Filing date: 2017-02-07
Publication date: 2018-08-16

Abstract

Provided in the present application are a method for network reselection and a device, the method comprising: a network selection function device obtaining information of a service required by a terminal device; according to the information of the service required by the terminal device, the network selection function device obtaining a public land communication network (PLMN) which may support the service; the network selection function device generating network reselection indication information according to the PLMN which may support the service, the network reselection indication information being used by the terminal device for determining a target PLMN, which may improve user experience.

Description

Method and device for network reselection

Technical field

Embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for network reselection in the field of communications.

Background technique

In the future communication system, the network can slice multiple logical core network network slice instances in the same physical device of the core network through the slicing technology, and the core network network slice instance can be customized according to specific business scenarios or user requirements. To meet the diversity of services while ensuring the isolation between network slice instances. Since the deployment of network slicing (or certain services, such as virtual reality/augmented reality, car networking) is regional, it is the first to deploy hotspots or urban areas. If the user moves from the slice coverage area of the public land mobile network (PLMN) to a slice uncovered area, the user cannot obtain the required service, but since the current area still has the coverage of the local PLMN, the user may be caused. If the local PLMN is congested, the local PLMN cannot provide normal services to the terminal device, resulting in a poor user experience.

Summary of the invention

The present application provides a method and apparatus for network reselection, which can improve user experience.

The first aspect provides a network reselection method, including: a network selection function (NSF) device acquires information of a service required by a terminal device; and the network selects a service device according to the terminal device requirement Acquiring information to obtain a public land communication network PLMN capable of supporting the service; the network selection function device generating network reselection indication information according to the PLMN capable of supporting the service, the network reselection indication information being used for the terminal The device determines the target PLMN.

In the embodiment of the present application, after the NSF device obtains the PLMN capable of supporting the service, the terminal device may reselect from the original PLMN to the target PLMN according to the network reselection indication information, and the target PLMN supports the service required by the terminal device. When the original PLMN does not support the services required by the terminal device, the service of the terminal device can be ensured to be normal, and the user experience can be further improved. When the original PLMN is congested, the new target PLMN can be determined for the terminal device, which can be a terminal. The device provides normal service and can improve the user experience.

Specifically, the number of PLMNs that the network selection function device can obtain according to the service information required by the terminal device that can support the service may be one or more;

When the number of the PLMNs that the NSF device can support the service is one, the network reselection indication information may indicate the PLMN, and the terminal device uses the PLMN as the target PLMN;

When the number of the PLMNs that can support the service is multiple, the NSF device can adopt the following two methods: 1) the NSF device selects one of the PLMNs, and the network reselection indication information can indicate the selected PLMN, and the terminal device will The selected PLMN is used as the target PLMN; 2) the network reselection indication information may indicate the plurality of PLMNs, the terminal device may determine the target PLMN in multiple PLMNs, and further, the terminal device may determine the target PLMN by using a specific rule specified by the protocol, Alternatively, the terminal device may arbitrarily select one PLMN as the target PLMN among the plurality of PLMNs, which is not limited in this embodiment.

Optionally, the core network device may include the NSF device, where the core network device does not support the terminal device requirement. When the service is performed, the NSF device can determine the PLMN of the service that supports the terminal device, so that when the core network device does not support the service required by the terminal device, when the terminal device reselects the PLMN that can support the service required by the terminal device according to the network reselection indication information. In the case of the target PLMN, the target PLMN can provide the service requirements for the terminal device. When the local PLMN to which the core network device belongs is congested, the NSF device can determine the PLMN that supports the service required by the terminal device. When the core network device is congested, the terminal device reselects the service that can support the terminal device according to the network reselection indication information. When the target PLMN in the PLMN, the target PLMN can provide services for the terminal device.

Optionally, the information about the service required by the NSF device to obtain the terminal device may be information about the service required by the terminal device that is sent by the other device, for example, the other device may be a mobility management function device; or the NSF device may be configured according to the first request message. Obtain information about the services required by the terminal device.

In some implementations, the NSF device acquires the information of the service required by the terminal device, where the NSF device receives the first request message, and the NSF device acquires the terminal device requirement according to the first request message. Business information. For example, the first request message may include information about a service required by the terminal device.

Optionally, after acquiring the public land communication network PLMN capable of supporting the service, the NSF device may send the network reselection indication information to the terminal device by using a mobility management function (MMF) device; Or the NSF device can be integrated in the MMF device, so that the NSF device can send the network reselection indication information to the terminal device. Optionally, the network reselection indication information can be carried in the response message of the first request message.

In some implementations, the NSF device acquires information about the service required by the terminal device according to the first request message, where the NSF device queries the subscription database according to the first request message; the NSF device Obtaining information of the service required by the terminal device from the subscription database. For example, the first request message may carry the identifier information of the terminal device, and when the NSF device receives the first request message, may query the service information of the terminal device in the subscription database according to the identifier information of the terminal device in the first request message. . Specifically, the NSF device queries the subscription database according to the first request message, and the NSF device sends a request message to the subscription database, where the request message is used to request information about a service required by the terminal device. The subscription database receives the fourth request message sent by the NSF device, and sends the subscription data of the terminal device to the NSF device according to the fourth request message, where the subscription data includes the requirements of the terminal device. Business information.

Optionally, the core network device may include an NSF device and a subscription database.

In some implementations, the method further includes: the NSF device acquiring the first indication information from the subscription database, where the first indication information is used to indicate that the terminal device is allowed to perform network reselection; Acquiring, by the NSF device, the public land communication network (PLMN) capable of supporting the service according to the information of the service required by the terminal device, including: information about the first indication information and the service required by the terminal device by the NSF device Obtaining the PLMN capable of supporting the service. The subscription data in the subscription database may include the first indication information. For example, the terminal device applies for the gold terminal device when the account is opened, and the gold terminal device has the right of network reselection, and the NSF device can determine whether the terminal device is in the subscription database. Have permission to perform network reselection when the NSF obtains the first indication. More specifically, the NSF device obtains the first indication information from the subscription database, and the NSF device sends a fourth request message to the subscription database. After the subscription database receives the fourth request message, the fourth request message may be And carrying the identification information of the terminal device, if the terminal device has the right to perform reselection, the contract database block carries the first indication information when returning the subscription data to the NSF device. For example, a carrier's gold medal user has the right to enjoy network re-election.

In some implementations, the NSF device receives the first request message, where the NSF device receives the first request message sent by the terminal device, and at this time, the mobility management function device may include an NSF device. Alternatively, the NSF device receives the first request message sent by the mobility management function device or the session function management device. At this time, the core network device includes the NSF device and the mobility management function device.

Optionally, the first request message is used to trigger the NSF device to determine information about the service required by the terminal device, where the first request message may be an attach request message, and the NSF device may determine, after receiving the attach request message sent by the terminal device, The service required by the terminal device; or the MMF device in the core network device forwards the attach request message to the NSF device after receiving the attach request message. Optionally, the first request message may also be a location update (LAU) request message, and the terminal device requests to update the current location, and the NSF device may determine the terminal device requirement after receiving the location update request message sent by the terminal device. After receiving the location update request message, the MMF device in the core network device forwards the location update request message to the NSF device. Optionally, the first request message may also be a service request message, where the service request message is used to request a service from a core network device. Optionally, the first request message may also be a network reselection request message, that is, when the signal quality of the terminal device is poor, the terminal device may request the core network device to replace the PLMN. In the embodiment of the present application, when the NSF device receives the first request message, the NSF device is triggered to determine the information of the service required by the terminal device. Specifically, the first request message is specifically limited, for example, when the NSF device is in the When the first request message of the terminal device is received, the identifier information of the terminal device may be determined, and the information of the service required by the terminal device may be determined according to the correspondence between the identifier information specified by the protocol and the service required by the terminal device.

Optionally, the service required by the terminal device corresponds to a specific network slice on the network side, and the network slice is to logically abstract the network into one or more isolated network slices, where the network slice includes a series of logical network functions. A network slice can be thought of as an instantiated 5G network. Such a network structure allows operators to provide the network as a service to users, and can freely combine physical networks according to indicators such as rate, capacity, coverage, delay, reliability, security, and availability to meet different users. Claim. The terminal device may be a mobile broadband type, a machine type communication type, or an inter-vehicle communication type terminal device or the like. The terminal device may be only one type of terminal device of the above type, or may be a plurality of terminal devices of the above type.

In some implementations, the first request message includes information about the service required by the terminal device, and the NSF device also sends the fourth request message to the subscription database, so that after the NSF device receives the first request message, the terminal device is acquired. The information of the required service is matched with the information of the service required by the terminal device in the subscription database to determine whether the terminal device is the terminal device at the time of signing, so that the identity of the terminal device can be verified, and the information is further ensured. Security.

In some implementations, the information about the service required by the terminal device is obtained by the NSF device, and the NSF device receives information about the service required by the terminal device that is sent by the mobility management function device or the session function management device. That is, the NSF device can receive the information of the service required by the terminal device sent by the other device, in addition to the information of the service required by the terminal device, according to the first request message.

In some implementations, the NSF device acquires the PLMN capable of supporting the service according to the service information of the terminal device, including: the NSF device acquires a network policy; and the NSF device is configured according to the terminal. The information of the service required by the device and the network policy acquire the PLMN capable of supporting the service.

In the embodiment of the present application, after determining the information of the service required by the terminal device, the NSF device may determine the public land communication network PLMNPLMN capable of supporting the service according to the service and PLMN mapping relationship specified by the protocol, or may determine according to the network policy. Public land communication network capable of supporting the service PLMNPLMN, for example, the network policy includes a roaming protocol, which is a cooperation agreement signed between multiple operators, the cooperation protocol allows the terminal device of the network to roam to the partner operator, so that the terminal device of the network is in the partner The operator obtains the service, and the roaming agreement may specify a correspondence between the PLMN of the plurality of PLMNs and the services supported by the PLMN, where the plurality of PLMNs include the target PLMNs finally selected by the terminal device, and optionally, the roaming protocol may include multiple The identity of the PLMN and the service type or slice type supported by multiple PLMNs.

In some implementations, the NSF device acquires a network policy, where the NSF device sends a second request message to a policy control function (PCF) device, where the second request message is used to request the a network policy, the network policy includes: the identifier information of the PLMN capable of supporting the service of the terminal device, and the information of the service that the PLMN can support; the NSF device receives the policy control function device according to the second The network policy that the request message is sent. For example, the second request message carries the information of the service required by the terminal device, and after receiving the second request message, the policy control function device sends the network policy to the NSF device according to the information of the service required by the terminal device. In the embodiment of the present application, the network policy may be stored in the PCF device, and the NSF device sends a second request message to the PCF device to request the network policy.

It should be understood that the NSF device receiving the first request message may send the fourth request message to the subscription database before the NSF device sends the fourth request message to the subscription database before the NSF device sends the fourth request message to the subscription database.

In some implementations, the network reselection indication information is further used to indicate identifier information of the PLMN that can support the service of the terminal device. For example, it may be the ID of the PLMN.

In the embodiment of the present application, the terminal device determines the target PLMN by using the network reselection indication information to indicate the identity information of one PLMN or multiple PLMNs, and the identifier information of the PLMN may be the identifier information of the PLMN included in the network policy.

In some implementations, the network reselection indication information is further used to indicate the identifier information of the PLMN capable of supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service, the priority The information is used by the terminal device to update the PLMN list whose priority corresponding to the PLMN saved by the terminal device in the original PLMN list is updated.

In the embodiment of the present application, the terminal device stores a pre-configured PLMN list, and when the terminal device receives the priority information of the PLMN indicated by the network reselection indication information, the terminal device updates the saved pre-configured PLMN list according to the priority information of the PLMN. The updated PLMN list, the terminal device determines the target PLMN in the updated PLMN list according to the identification information of the PLMN. For example, the priority information may be priority information of one PLMN or priority information of multiple PLMNs.

In some implementations, the network reselection indication information includes timer information, where the timer information is used to indicate that the terminal device restores the updated PLMN list to a location when the timer expires. The original PLMN list is described. The timer information may indicate the duration of the timer; optionally, the timer information may indicate an identifier of the duration of the timer. For example, the protocol specifies that the timer of the multiple timers may correspond to the timer identifier; optionally, the timing The device information may indicate that the terminal device may adopt a timer. Specifically, the duration of the timer may be a default value specified by the protocol, and the startup time of the timer may be a startup time specified by the protocol; optionally, the timer information may be used to instruct the terminal device to start. The timing of the timer, for example, the protocol specifies a plurality of times when the timer is started, the timer information may be the start time of the timer, and the duration of the timer is the duration specified by the protocol.

In some implementations, the timer information is specifically used to indicate a duration of the timer, and the terminal device restores the updated PLMN list to the original PLMN list when the timer expires.

In some implementations, the network reselection indication information is further used to indicate that the terminal device performs network reselection, that is, when the terminal device receives the network reselection indication information, it may determine that the current network reselection is required. The network reselection indication message is received.

In a second aspect, a method for network reselection is provided, including: a terminal device sends a first request message to a core network device; and the terminal device receives a network reselection sent by the core network device according to the first request message. Instructing information, the network reselection indication information is used to instruct the terminal device to determine a target public land communication network PLMN; the terminal device determines the target PLMN according to the network reselection indication information; The target PLMN sends a third request message.

In some implementations, the first request message includes information of a service required by the terminal device.

In some implementations, the network reselection indication information is used to indicate the identifier information of the PLMN that can support the service of the terminal device, where the terminal device determines, according to the network reselection indication information, The target PLMN includes: the terminal device determines the target PLMN according to the identifier information of the PLMN that can support the service of the terminal device indicated by the network reselection indication information. For example, the network reselection indication information indicates the identification information of one PLMN, and the terminal device determines the PLMN corresponding to the identification information as the target PLMN; and the network reselection indication information indicates the identification information of the plurality of PLMNs, the terminal The device determines a plurality of PLMNs according to the identification information of the plurality of PLMNs, and then determines the target PLMNs in the plurality of PLMNs, for example, arbitrarily selects one PLMN as the target PLMN among the plurality of PLMNs, and may select one PLMN as the target in the plurality of PLMNs according to a specific rule. The PLMN, for example, the specific rule may be to preferentially select a PLMN with a higher priority as the target PLMN.

In some implementations, the network reselection indication information is further used to indicate the identifier information of the PLMN capable of supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service; Determining, by the terminal device, the target PLMN according to the network reselection indication information, including: the terminal device updating the terminal device according to the priority information and the identifier information of the PLMN capable of supporting the service of the terminal device The priority corresponding to the PLMN in the original PLMN list is updated with the PLMN list; the terminal device determines the target PLMN in the updated PLMN list.

In some implementations, the network reselection indication information includes timer information, where the timer information is used to indicate that the terminal device restores the updated PLMN list to the original when the timer expires. a PLMN list, after the terminal device determines the target PLMN in the updated PLMN list, the method further includes: the terminal device starting the timer, when the timer expires, the The terminal device restores the updated PLMN list to the original PLMN list according to the timer information.

In some implementations, the timer information is specifically used to indicate a duration of the timer, and the terminal device starts the timer. When the timer expires, the terminal device uses the timer information according to the timer information. Before the reverting the updated PLMN list to the original PLMN list, the method further includes: determining, by the terminal device, a duration of the timer according to the timer information; the terminal device starting the timer When the timer expires, the terminal device restores the updated PLMN list to the original PLMN list according to the timer information, including: the terminal device receiving the network reselection indication When the information is started, the timer is started, when the timer expires, the updated PLMN list is restored to the original PLMN list, or the terminal device sends a second request message to the target PLMN. Thereafter, when returning to the idle state, the timer is started, and when the timer expires, the updated PLMN list is restored to the original PLMN list.

In the embodiment of the present application, the function of the timer is to restore the updated PLMN list to the original PLMN column. The table is configured to prevent the terminal device from using the updated PLMN list to select the target PLMN when the network is selected. When the list is restored to the original PLMN list, the terminal device may select the network to select the local PLMN where the core network device is located. Specifically, the terminal device determines the timer duration according to the timer information. There are two ways for the timer to start. One way is that when the terminal device receives the reselection indication information, the terminal device starts the timer; another method is When the terminal device sends the third request message to the target PLMN and returns to the idle state, the terminal device starts a timer.

In some implementations, the network reselection indication information is further used to indicate that the terminal device performs network reselection, and the terminal device sends a third request message to the target PLMN, including: the terminal device according to the The network reselection indication information determines that a reselection network needs to be performed; after the terminal device determines that the reselection network needs to be performed, the terminal device sends the third request message to the target PLMN.

In some implementations, the third request message includes second indication information, where the second indication information is used to indicate that the third request message is a request message that is sent by the terminal device when performing network reselection.

In other words, when the terminal device sends the third request message to the target PLMN, the target PLMN may be indicated by the second indication information, where the third request message is a request message sent during network reselection, so that the target PLMN receives the message. In the third request message, even if the target PLMN does not support the information of the service required by the terminal device, the terminal device may be assigned a default network slice to prevent the terminal device from continuously reselecting, and the target is selected every time the reselection is performed. PLMN can prevent the terminal device from falling into an infinite loop.

The third aspect is a method for performing the first aspect or any of the possible implementations of the first aspect. In particular, the apparatus comprises means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.

In a fourth aspect, a device for network reselection is provided for performing the method of any of the foregoing second aspect or any of the possible implementations of the second aspect. In particular, the apparatus comprises means for performing the method of any of the above-described second aspect or any of the possible implementations of the second aspect.

In a fifth aspect, a system for network reselection is provided, comprising the apparatus of the third aspect or any alternative implementation thereof. The system may further comprise at least one device in the fourth aspect or any alternative implementation thereof.

In a sixth aspect, an apparatus for network reselection is provided, the apparatus can include a transceiver and a processor, the terminal apparatus can perform the method of the first aspect or any alternative implementation thereof.

In a seventh aspect, a device for network reselection is provided, the device can include a transceiver and a processor, the terminal device can perform the method of the second aspect or any alternative implementation thereof.

In an eighth aspect, a computer readable storage medium storing instructions for performing the method of the first aspect or various implementations thereof is provided.

In a ninth aspect, a computer readable storage medium storing instructions for performing the method of the second aspect or the various implementations thereof is provided.

In a tenth aspect, a computer program product comprising instructions for causing a computer to perform the method of the above aspects when executed on a computer is provided.

DRAWINGS

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application.

2 is a method of network reselection in an embodiment of the present application.

FIG. 3 is another method of network reselection in the embodiment of the present application.

FIG. 4 is another method of network reselection in the embodiment of the present application.

FIG. 5 is a device for network reselection according to an embodiment of the present application.

FIG. 6 is another apparatus for network reselection according to an embodiment of the present application.

FIG. 7 is a system for network reselection according to an embodiment of the present application.

FIG. 8 is an apparatus for network reselection according to an embodiment of the present application.

FIG. 9 is another apparatus for network reselection according to an embodiment of the present application.

detailed description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, and a wideband code. Wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) System, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, wireless local area network (wireless local area) Network, WLAN) or the fifth generation of the fifth generation wireless communication system (the fifth generation, 5G).

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application, including:

The terminal device 110 may be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal, or a terminal device in a future 5G network, and the terminal device may be wirelessly accessed. A radio access network (RAN) communicates with one or more core networks. For example, the terminal may be a mobile phone (or "cellular" phone) or a computer with a mobile terminal, etc., for example, the terminal may also be portable. Pocket, handheld, computer built-in or in-vehicle mobile devices that exchange voice and/or data with a wireless access network.

The access network device 120 may be a base station controller (BSC) in GSM or CDMA, or a radio node controller (RNC) in WCDMA, or may be an evolved type in LTE. The present invention is not limited to the embodiment of the present invention. For the convenience of description, the following embodiments will be described by taking an eNB as an example.

The core network device 130 includes an MMF module 131, an NSF module 132, a subscription data (SD) module 133, and a PCF module 134. Specifically, the MMF module 131 is responsible for mobility management, including terminal device level management such as access management. The MMF module 313 is also an entry function module of the access network device 120 to the core network device 130. The NSF module 132 is responsible for the generation of the network selection strategy. The function may generate a network selection policy according to the subscription data of the terminal device 110, the network slice requested by the terminal device 110, the roaming protocol, the local policy, and the like, and send the generated network selection policy to the terminal device. The NSF module 132 can be a stand-alone module or an integral part of other networks. For example, the NSF module is an integral part of the MMF module 131 or an integral part of the PCF module 134. The SD module 133 is used to store subscription data of the terminal device 110. The PCF device is responsible for the preservation, update, etc. of network policies such as local policies, roaming protocols, and the like. It should be understood that the functions of the MMF module 131 can be integrated in the MMF device, the functions of the NSF module 132 can be integrated in the NSF device, the functions of the SD module 133 can be integrated in the subscription database, and the functions of the PCF module 134 can be integrated in In a PCF device. The core network device 130 may include at least one of an NSF device, an MMF device, a PCF device, and a subscription database.

FIG. 2 illustrates a method 200 of network reselection in an embodiment of the present application, the method 200 including:

S210: The NSF device acquires information about a service required by the terminal device.

The information of the service may be information that identifies the service. For example, it can be, the ID of the business, the Application ID, or the type of the business, and so on.

Alternatively, the S210 can have multiple implementations, for example,

In a first implementation manner, the NSF device receives the first request message sent by the terminal device 110, where the first request message carries information about the service required by the terminal device 110.

In a second implementation manner, the NSF device receives the first request message sent by the terminal device 110, and the NSF device queries the service information required by the terminal device 110 stored in the subscription database according to the first request message. The identifier of the terminal device, and the NSF device obtains the query subscription database according to the identifier of the terminal device. The identifier of the terminal device may be information identifying the terminal device, and may be a permanent identifier assigned by the operator to the terminal device, such as an international mobile subscriber identification number (IMSI), or may be a temporary identifier, such as a global identifier. The globally unique temporary UE identity (GUTI) may also be the IP address of the terminal device.

In a third implementation manner, the NSF device receives the first request message sent by the MMF device, where the first request message carries information about the service required by the terminal device 110.

In a fourth implementation manner, the NSF device receives the first request message sent by the MMF device, and the NSF device queries the service information required by the terminal device 110 stored in the subscription database according to the first request message. Specifically, the first request message carries the terminal. The identifier of the device is obtained by querying the subscription database according to the identifier of the terminal device.

In a fifth implementation manner, the NSF device receives the information of the service required by the terminal device 110 sent by the MMF device. Of course, the NSF device can also receive the information of the service required by the terminal device 110 sent by the other device.

In a sixth implementation manner, the NSF device receives information about a service required by the terminal device 110 and sent by the session management function device.

It should be understood that in the first implementation and the second implementation, the NSF device can be integrated in the MMF device. In the third implementation manner and the fourth implementation manner, the NSF device and the MMF device are two independent devices.

S220. The NSF device acquires a public land communication network PLMN capable of supporting the service according to the information of the service required by the terminal device 110.

Optionally, when the core network device 130 does not support the service required by the terminal device 110, the NSF device may determine the PLMN that supports the service required by the terminal device 110, such that the core network device 130 does not support the service required by the terminal device 110, when the terminal When the device 110 reselects to the PLMN according to the network reselection indication information, the PLMN can provide the terminal device 110 with a service requirement. When the local PLMN to which the core network device 130 belongs is congested, the NSF device may determine the PLMN supporting the service required by the terminal device 110, such that when the core network device 130 is congested, when the terminal device 110 reselects to the PLMN according to the network reselection indication information, The PLMN can provide services to the terminal device 110.

S230. The NSF device generates network reselection indication information according to the PLMN capable of supporting the service, where the network reselection indication information is used by the terminal device 110 to determine the target PLMN. The network reselection indication information may be identification information of one or more PLMNs, and/or priority information of one or more PLMNs, etc. The application examples do not limit this.

Specifically, in S220, the number of PLMNs that the NSF device can obtain according to the service information required by the terminal device that can support the service may be one or multiple; when the NSF device acquires the number of PLMNs that can support the service, For one time, the PLMN can be used as the target PLMN of the terminal device, and the network reselection indication information in S230 can directly indicate that the terminal device selects the target PLMN; when the number of the PLMNs that can support the service is obtained by the NSF device. The network reselection indication information in S230 may indicate the multiple PLMNs to the terminal device, and the terminal device may determine the target PLMN in multiple PLMNs. Further, the terminal device may determine the target PLMN by using a specific rule specified by the protocol, or the terminal device. A PLMN can be arbitrarily selected as a target PLMN among a plurality of PLMNs, which is not limited in this embodiment of the present application.

Therefore, after the NSF device acquires the PLMN capable of supporting the service, the terminal device 110 may reselect from the original PLMN to the target PLMN according to the network reselection indication information, or the terminal device 110 may be in accordance with the network reselection indication information. The target PLMN is selected from the plurality of PLMNs and then reselected to the target PLMN, and the target PLMN supports the services required by the terminal device 110. When the original PLMN does not support the services required by the terminal device 110, the service of the terminal device 110 can be guaranteed to be normal. The user experience is further improved; or when the original PLMN is congested, the new target PLMN can be determined for the terminal device 110, and the terminal device 110 can be provided with normal services, which can improve the user experience.

FIG. 3 illustrates a method 300 of network reselection in an embodiment of the present application, the method 300 including:

S310. The terminal device 110 sends a first request message to the core network device 130.

Optionally, the first request message may include information about a service required by the terminal device 110, or may also include an identifier of the terminal device.

It should be understood that the core network device 130 is the core network device of the current PLMN.

Optionally, the first request message is used to trigger the NSF device to determine information about the service required by the terminal device 110, where the first request message may be an attach request message, after the NSF device receives the attach request message sent by the terminal device 110, The service required by the terminal device 110 may be determined; or the MMF device in the core network device 130 forwards the attach request message to the NSF device after receiving the attach request message. Optionally, the first request message may also be a location update (LAU) request message, and the terminal device 110 requests to update the current location, and the NSF device may determine the terminal after receiving the location update request message sent by the terminal device 110. The service required by the device 110; or the MMF device in the core network device 130 forwards the location update request message to the NSF device after receiving the location update request message. Optionally, the first request message may also be a service request message, where the service request message is used to request a service from the core network device 130. Optionally, the first request message may also be a network reselection request message, that is, when the signal quality of the terminal device 110 is poor, the terminal device 110 may request the core network device 130 to replace the PLMN. In the embodiment of the present application, when the NSF device receives the first request message, the NSF device is triggered to determine the information of the service required by the terminal device 110. Specifically, the first request message is specifically limited, for example, when the NSF device is used. When the first request message of the terminal device 110 is received, the identifier information of the terminal device 110 may be determined, and the information of the service required by the terminal device 110 may be determined according to the correspondence between the identifier information specified by the protocol and the service required by the terminal device 110. .

As an optional embodiment, S210 includes: S320, the NSF device in the core network device 130 receives the first request message sent by the terminal device 110, and the NSF device acquires the requirement of the terminal device 110 according to the first request message. Business information. Optionally, when the NSF device is a sub-device of the MMF device, the NSF device may directly receive the first request message sent by the terminal device 110; when the NSF device is a stand-alone device or a PCF device The NSF device receives the first request message sent by the terminal device 110 through the MMF device.

Optionally, the service required by the terminal device 110 corresponds to a specific network slice on the network side, and the network slice is to logically abstract the network into one or more isolated network slices, where the network slice includes a series of logical network functions. . A network slice can be thought of as an instantiated 5G network. Such a network structure allows operators to provide the network as a service to users, and can freely combine physical networks according to indicators such as rate, capacity, coverage, delay, reliability, security, and availability to meet different users. Claim. The terminal device 110 may be a mobile broadband type, a machine type communication type, or an inter-vehicle communication type terminal device or the like. The terminal device 110 may be only one type of terminal device of the above type, or may be a plurality of terminal devices of the above type.

For example, in the 5th generation (5G) network, the enhanced mobile broadband (eMBB) network slice and mass machine type communication (mMTC) network slice can be customized according to business needs. Ultra reliable machine type communication (uMTC) network slice.

As an optional embodiment, the first request message includes information of the service required by the terminal device 110, and the NSF device also queries the subscription database for information of the service required by the terminal device 110, such that after the NSF device receives the first request message, And obtaining the information of the service required by the terminal device 110, and matching the information of the service required by the terminal device 110 in the subscription database to determine whether the terminal device 110 is the terminal device 110 at the time of signing, so that the terminal device 110 can be The identity is verified to further ensure the security of the information.

S330. The NSF device in the core network device 130 acquires a public land communication network PLMN capable of supporting the service according to the information of the service required by the terminal device 110.

As an optional embodiment, the method 300 further includes: the NSF device acquiring first indication information from the subscription database, where the first indication information is used to indicate that the terminal device 110 is allowed to perform network reselection; The S330 includes: the NSF device acquiring, according to the first indication information and information about a service required by the terminal device 110, the PLMN capable of supporting the service. The subscription data in the subscription database may include first indication information. For example, the terminal device 110 applies for a gold terminal device when the account is opened, and the gold terminal device has the right to reselect the network, and the NSF device can determine the terminal device in the subscription database. Whether there is permission to perform network reselection, when the NSF obtains the first indication information. More specifically, the NSF device obtains the first indication information from the subscription database, and the NSF device sends a fourth request message to the subscription database. After the subscription database receives the fourth request message, the fourth request message may be The identification information of the terminal device 110 is carried. If the terminal device 110 has the right to perform reselection, the subscription database block carries the first indication information when returning the subscription data to the NSF device. For example, a carrier's gold medal user has the right to enjoy network re-election.

As an optional embodiment, S330 includes: the NSF device acquires a network policy; and the NSF device acquires the PLMN capable of supporting the service according to information about a service required by the terminal device 110 and a network policy. Optionally, the NSF device may determine, according to the first indication information, that the terminal device 110 performs network reselection, and then the NSF device acquires public land communication capable of supporting the service according to the information of the service required by the terminal device 110 and the network policy. Network PLMN.

Specifically, after determining the information of the service required by the terminal device 110, the NSF device may determine the PLMN that can support the service according to the service and the PLMN mapping relationship specified by the protocol, or determine the PLMN that can support the service according to the network policy. For example, the network policy includes a roaming protocol, which is a cooperation agreement between multiple operators, which allows the terminal device 110 of the local network to roam to the partner operator, so that the terminal device 110 of the local network is The partner operator obtains the service, and the roaming agreement can specify the plurality of PLMNs. Correspondence between the PLMN and the services supported by the PLMN, the plurality of PLMNs include the target PLMNs finally selected by the terminal device. Optionally, the roaming protocol may include the identifiers of the plurality of PLMNs and the service types or slice types supported by the plurality of PLMNs.

As an optional embodiment, the NSF device acquires a network policy, including: the NSF device sends a second request message to a policy control function (PCF) device, where the second request message is used to request the a network policy, the network policy includes: the identifier information of the PLMN capable of supporting the service of the terminal device, and the information of the service that the PLMN can support; the NSF device receives the policy control function device according to the second The network policy that the request message is sent. For example, the second request message carries the context information of the terminal device 110, and after receiving the second request message, the policy control function device sends the related network policy according to the context information of the terminal device 110. In the embodiment of the present application, the network policy may be stored in the PCF device, and the NSF device sends a second request message to the PCF device to request the network policy. Optionally, the NSF device can be integrated into the PCF device, that is, the NSF device is a child device of the PCF device, and the NSF device acquiring the network policy may be acquiring the network policy saved by the PCF device.

S240. The core network device 130 sends network reselection indication information to the terminal device 110, where the network reselection indication information is used by the terminal device to determine the target PLMN. For example, the network reselection indication information may be carried in the response message of the first request message. Specifically, when the NSF device and the MMF device are two independent devices, the NSF device in the core network device 130 sends the network reselection indication information to the terminal device 110 through the MMF device; when the NSF device is a child device of the MMF device, The NSF device in the core network device 130 transmits the network reselection indication information to the terminal device 110.

S250, the terminal device 110 receives the network reselection indication information sent by the core network device 130. Specifically, the terminal device 110 may receive the network reselection indication information sent by the MMF device in the core network device 130. Or the terminal device 110 may receive the network reselection indication information sent by the NSF device in the core network device 130 according to the first request message. The terminal device 110 determines the target PLMN according to the network reselection indication information.

As an optional embodiment, the network reselection indication information is further used to indicate identification information of the PLMN. The S260 includes: the terminal device 110 determines the target PLMN according to the identifier information of the PLMN that can support the service of the terminal device, which is indicated by the network reselection indication information. The terminal device 110 determines the target PLMN by using the identifier information of the PLMN indicated by the network reselection indication information, and the identifier information of the PLMN may be carried in the network policy requested by the second request message sent by the NSF device included in the core network device 130 to the PCF device. The identification information of the PLMN supporting the service. The identification information of the PLMN may be the identification information of one PLMN or the identification information of multiple PLMNs. For example, the identification information of the PLMN may be an identity (ID) of the PLMN.

As an optional embodiment, the network reselection indication information is further used to indicate the identifier information of the PLMN capable of supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service, the priority The information is used by the terminal device 110 to update the PLMN list whose priority corresponding to the PLMN held by the terminal device 110 in the original PLMN list is updated. S260, comprising: the terminal device 110 updating the terminal device according to the priority information and the identifier information of the PLMN capable of supporting the service of the terminal device. The priority corresponding to the PLMN in the original PLMN list saved by 110 is obtained as an updated PLMN list. For example, the terminal device 110 stores a pre-configured PLMN list, and when the terminal device 110 receives the priority information of the first PLMN and the second PLMN indicated by the network reselection indication information, the saved pre-configured PLMN list is updated according to the priority information. The priority of the first PLMN and the second PLMN is obtained by the updated PLMN list, and the terminal device 110 determines the target PLMN in the updated PLMN list according to the identification information of the PLMN. For example, if the identifier information identifies a PLMN, the terminal The device searches for the PLMN corresponding to the identifier information in the updated PLMN list. When the identifier information is the identifier information of the plurality of PLMNs, the terminal device searches for the plurality of PLMNs corresponding to the identifier information in the updated PLMN list, in multiple The target PLMN is selected in the PLMN.

For example, when the target PLMN is included in the original PLMN list held by the terminal device 110, the terminal device 110 finds the target PLMN according to the identification information of the target PLMN, and then updates the priority of the target PLMN in the original PLMN list according to the priority information of the target PLMN, for example, for example. The priority of the target PLMN in the original list is the third, and the priority information of the target PLMN indicates that the priority of the target PLMN is the first in the original list PLMN list, and the terminal device 110 updates the priority of the target PLMN from the third to First, the updated PLMN list is obtained; when the target PLMN is not included in the PLMN list saved by the terminal device 110, the terminal device 110 adds the identification information of the target PLMN and the target PLMN to the original PLMN list according to the priority information of the target PLMN. Get the updated list of PLMNs.

As an optional embodiment, the network reselection indication information includes timer information, where the timer information is used to indicate that the terminal device 110 restores the updated PLMN list to when the timer expires. The original PLMN list. After the terminal device 110 determines the target PLMN in the updated PLMN list, the method 200 further includes: the terminal device 110 starts the timer, when the timer expires, the The terminal device 110 restores the updated PLMN list to the original PLMN list according to the timer information.

Optionally, the timer information may indicate a duration of the timer; optionally, the timer information may indicate an identifier of a duration of the timer, for example, the protocol specifies that the timer of the multiple timers may correspond to the timer identifier; The timer information may indicate that the terminal device 110 may use a timer. Specifically, the duration of the timer may be a default value specified by the protocol, and the startup time of the timer may be a startup time specified by the protocol; optionally, the timer information may be The time at which the terminal device 110 starts the timer is indicated. For example, the protocol specifies a plurality of times when the timer is started, the timer information may be the start time of the timer, and the duration of the timer is the duration specified by the protocol.

As an optional embodiment, the timer information is specifically used to indicate the duration of the timer. The terminal device 110 starts the timer, and when the timer expires, the terminal device 110 restores the updated PLMN list to the original PLMN list according to the timer information, The method 200 also includes:

The terminal device 110 determines the duration of the timer according to the timer information.

The terminal device 110 starts the timer, and when the timer expires, the terminal device 110 restores the updated PLMN list to the original PLMN list according to the timer information, including:

When receiving the network reselection indication information, the terminal device 110 starts the timer, and when the timer expires, restores the updated PLMN list to the original PLMN list, or

After the terminal device 110 returns to the idle state after sending the second request message to the target PLMN, the timer is started, and when the timer expires, the updated PLMN list is restored to the The original PLMN list.

Specifically, in the embodiment of the present application, the function of the timer is to restore the updated PLMN list to the original The PLMN list is configured to prevent the terminal device 110 from using the updated PLMN list to select the network to select the target PLMN. When the list is restored to the original PLMN list, the terminal device 110 can select the network to select the core network device 130. Local PLMN. Specifically, there are two ways to start the timer. One way is to start the timer when the terminal device 110 receives the reselection indication information. In another manner, when the terminal device 110 sends the third request to the target PLMN. After the message, upon returning to the idle state, the terminal device 110 starts a timer. The specific use of the startup time may be configured by the network or by a protocol. The embodiment of the present application does not limit this.

As an optional embodiment, the network reselection indication information is further used to indicate the reason why the terminal device 110 performs network reselection.

S360. The terminal device 110 sends a third request message to the target PLMN. For example, the third request message may be a registration request message, for example, the registration request message may be an attach request message or a LAU request message.

As an optional embodiment, the third request message includes second indication information, where the second indication information is used to indicate that the third request message is a request message sent by the terminal device 110 when performing network reselection. . When the target PLMN receives the third request message, the target PLMN determines, according to the second indication information carried in the third request message, that the third request message is that the terminal device 110 reselects from the other PLMN to the target PLMN, regardless of the target PLMN. Whether the service requested by the terminal device 110 is supported, the registration of the terminal device 110 is received, and the service corresponds to a specific network slice. When the target PLMN does not support the service requested by the terminal device 110, the terminal device 110 may be used. Assigned to the default slice. For example, when the terminal device 110 selects a network to the target PLMN, the target PLMN may cause the network slice of the location where the terminal device 110 is located to be unavailable due to weak signals, etc., if the target PLMN does not accept the access of the terminal device 110, the terminal device 110 will re-select, for example, according to the PLMN priority in the PLMN list, and then re-select the target PLMN, which will cause the terminal device 110 to continuously access, when the target PLMN assigns the terminal device 110 to a default When slicing, the terminal device 110 is prevented from falling into an infinite loop of the non-stop network.

As an example, FIG. 4 illustrates a method 400 for network reselection provided by an embodiment of the present application, including:

S401. The access network device 120 broadcasts system information to the terminal device 110, where the system information carries the identifier information of the PLMN. For example, the access network device 120 may be an evolved UMTS terrestrial radio access (E-UTRA) eNB, an (evolved E-UTRA, eE-UTRA) eNB, or a new air interface in a future network system. (new radio, NR) node, etc. For example, the system information may include identification information of a plurality of PLMNs.

S402, the terminal device 110 acquires the identifier information of the plurality of PLMNs in the system information, and the terminal device 110 determines, among the plurality of PLMNs, an available accession technology (RAT) corresponding to the available PLMN and the available PLMN. Specifically, The PLMN list may be pre-configured for the terminal device 110, the PLMN list is generated according to the priority of the PLMN, and the terminal device 110 may determine, according to the acquired identifier information of the PLMN, that the PLMN with high priority is the available PLMN, and the available PLMN corresponds to the PLMN. The one or more RATs, the terminal device 110 determines the RAT corresponding to the available PLMN according to the current network condition.

S403. The terminal device 110 sends a first request message to the NSF device that is included in the core network device 130 of the available PLMN. Optionally, the first request message may carry information about the service required by the terminal device 110, for example, the first request message. It can be an Attach request message or a LAU request message.

S404. When the NSF device receives the first request message, for example, the first request message may be determined according to the first request message. The information about the service required by the terminal device 110, specifically, the NSF device may determine the information of the service required by the terminal device 110 according to the information of the service required by the terminal device 110 in the first request message, or is not included in the first request message. When the information about the service required by the terminal device 110 is received, the NSF device can determine the information of the service required by the terminal device 110 by using the identification information of the terminal device 110 when receiving the first request message. Optionally, the terminal device 110 can be connected to the terminal. There is a correspondence between the information of the services required by the device 110. Optionally, when the NSF device determines that the core network device 130 does not support the information of the service required by the terminal device 110, the NSF device may send the second request message to the subscription database.

S405: The subscription database receives the fourth request message sent by the NSF device, and determines information about the service required by the terminal device 110 according to the information about the subscription of the terminal device 110, and carries the information of the service required by the terminal device 110 in the subscription data. Send to the NSF device. Optionally, the subscription data further includes first indication information, where the first indication information may indicate that the terminal device 110 is allowed to perform network reselection. For example, the gold terminal device 110 has the right to reselect the network.

S406, when the NSF device receives the first indication information sent by the subscription database, the NSF device determines that the terminal device 110 has the right to reselect the network, and the NSF device sends the second request message to the PCF device; or the NSF device determines that the terminal device is not supported. When the information of the required service is 110, the NSF device sends a second request message to the PCF; or when the NSF device determines that the current network is congested, the NSF device sends a second request message to the PCF device. The second request message is used to request a network policy from the PCF device, and the network policy may include a roaming agreement or the like.

S407. The PCF device returns a network policy to the NSF device.

S408. The NSF device determines, according to the network policy and the information about the service acquired by the terminal device 110, the PLMN that supports the information of the service required by the terminal device 110 in the network policy. For example, the roaming protocol included in the network policy is signed between multiple operators. a cooperation agreement, which allows the terminal device 110 of the local network to roam to the partner operator, so that the terminal device 110 of the local network obtains the service at the partner operator, and the roaming protocol may specify the PLMN and the PLMN supported by the plurality of PLMNs. Corresponding relationship of the service, the multiple PLMNs include the target PLMNs finally selected by the terminal device. Optionally, the roaming protocol may include the identifiers of the plurality of PLMNs and the service types or slice types supported by the plurality of PLMNs.

S409: When the NSF device determines the PLMN that can support the service, the NSF device may send the network reselection indication information to the terminal device 110. For example, the NSF device sends the network reselection indication information to the terminal device 110 by using the MMF device. Optionally, the network reselection indication information may carry a response message of the first request message.

S410. The terminal device 110 determines the target PLMN according to the network reselection indication information.

The network reselection indication information may have three indications in addition to the selection of the target PLMN. The network reselection indication information may also indicate the service capable of supporting the terminal device. Identification information of the PLMN; second, the network reselection indication information may further indicate the identification information of the PLMN capable of supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service, the priority The information is used by the terminal device 110 to update the PLMN list in which the priority corresponding to the PLMN capable of supporting the service saved by the terminal device 110 in the original PLMN list is updated; third, the network reselection indication information may also indicate The timer information is used to restore the updated PLMN list to the original PLMN list. For example, the timer information may be a timer duration.

S411. The terminal device 110 sends a third request message to the target PLMN. For example, the third request message may be an Attach request message or a LAU request message. Optionally, the third request message carries the second indication information, where the second indication information is used to indicate that the third request message is sent by the terminal device 110 when performing network reselection. Ask for news.

It should be understood that the method 300 is merely an exemplary example and does not limit the application. For example, the NSF device, the subscription database, and the PCF device may be integrated into one device, such that the method 300 may not include S304-S307. The foregoing division of the plurality of devices is only for convenience of description. For example, the PCF device may also implement the function of a slice selection function (SSF) module, and the SSF module may be used for network slice selection, and may be based on the service required by the terminal device 110. And/or the access point, determining which network slice to access for the terminal device 110. Moreover, the above-mentioned serial numbers are only for convenience of description, and do not limit the execution order.

The method for network reselection according to an embodiment of the present application is described in detail above with reference to FIG. 2 to FIG. 4, and an apparatus and system for network reselection according to an embodiment of the present application will be described below with reference to FIG. 5 to FIG.

FIG. 5 shows an apparatus 500 for network reselection provided by an embodiment of the present application, including:

The receiving unit 510 is configured to acquire information about a service required by the terminal device 110.

The receiving unit 510 is further configured to acquire, according to the information of the service required by the terminal device 110, a public land communication network PLMN capable of supporting the service;

The processing unit 520 is configured to generate network reselection indication information according to the PLMN capable of supporting the service, where the network reselection indication information is used by the terminal device to determine the target PLMN.

As an optional embodiment, the receiving unit 510 is specifically configured to: receive the first request message; and obtain information about the service required by the terminal device 110 according to the first request message.

As an optional embodiment, the receiving unit 510 is further configured to: query the subscription database according to the first request message, and obtain information about the service required by the terminal device 110 from the subscription database.

As an optional embodiment, the receiving unit 510 is further configured to: obtain first indication information from the subscription database, where the first indication information is used to indicate that the terminal device 110 is allowed to perform network reselection; The receiving unit 510 is further configured to: acquire the PLMN capable of supporting the service according to the first indication information and the information of the service required by the terminal device 110.

As an optional embodiment, the receiving unit 510 is further configured to: receive the first request message sent by the terminal device 110, or receive the first part sent by the mobility management function device or the session function management device. A request message.

As an optional embodiment, the receiving unit 510 is further configured to: receive information about a service required by the terminal device 110 sent by the mobility management function device.

As an optional embodiment, the receiving unit 510 is further configured to: acquire a network policy, and acquire, according to the information of the service required by the terminal device 110 and the network policy, the PLMN capable of supporting the service.

As an optional embodiment, the apparatus 500 further includes: a sending unit, configured to send a second request message to the policy control function device, where the second request message is used to request the network policy, where the network policy includes The identifier information of the PLMN capable of supporting the service of the terminal device and the information of the service that the target PLMN can support; the receiving unit 510 is further configured to: receive the policy control function device according to the second The network policy that the request message is sent.

As an optional embodiment, the network reselection indication information is further used to indicate the identifier information of the PLMN that can support the service of the terminal device, or the network reselection indication information is further used to indicate that the The identification information of the PLMN supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service, the priority information being used by the terminal device 110 to update the target saved by the terminal device 110 in the original PLMN list The priority corresponding to the PLMN is obtained from the updated PLMN list.

As an optional embodiment, the network reselection indication information includes timer information, where the timer information is used to indicate that the terminal device 110 restores the updated PLMN list to when the timer expires. The original PLMN list.

As an optional embodiment, the timer information is specifically used to indicate the duration of the timer.

As an optional embodiment, the network reselection indication information is further used to instruct the terminal device 110 to perform network reselection.

It should be understood that the apparatus 500 herein is embodied in the form of a functional unit. The term "unit" as used herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (eg, a shared processor, a proprietary processor, or a group) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and/or other suitable components that support the described functionality. In an optional example, those skilled in the art may understand that the device 500 may be specifically the NSF device in the foregoing embodiment, and the device 500 may be used to perform various processes and/or steps corresponding to the NSF device in the foregoing method embodiment. To avoid repetition, we will not repeat them here.

FIG. 6 shows an apparatus 600 for network reselection provided by an embodiment of the present application, including:

The sending unit 610 is configured to send a first request message to the core network device 130.

The receiving unit 620 is configured to receive network reselection indication information that is sent by the core network device 130 according to the first request message, where the network reselection indication information is used to indicate a public terrestrial communication network capable of supporting services of the device. PLMN;

The processing unit 630 is configured to determine, according to the network reselection indication information, the target PLMN;

The sending unit 610 is further configured to send a third request message to the target PLMN.

As an optional embodiment, the first request message includes information of a service required by the device 600.

As an optional embodiment, the network reselection indication information is used to indicate the identifier information of the PLMN that can support the service of the terminal device, and the processing unit 630 is specifically configured to indicate according to the network reselection indication information. The identification information of the PLMN capable of supporting the service of the terminal device determines the target PLMN.

As an optional embodiment, the network reselection indication information is further used to indicate the identifier information of the PLMN capable of supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service; the processing unit The 630 is further configured to: update, according to the priority information, a PLMN list that is updated with a priority corresponding to the PLMN in the original PLMN list saved by the device 600; and according to the PLMN that can support the service of the terminal device. The identification information determines the target PLMN in the updated PLMN list.

As an optional embodiment, the network reselection indication information includes timer information, where the timer information is used to indicate that the terminal device 110 restores the updated PLMN list to the The processing unit 530 is further configured to: after determining the target PLMN in the updated PLMN list, start the timer, when the timer expires, according to the timer information The updated PLMN list is restored to the original PLMN list.

As an optional embodiment, the timer information is specifically used to indicate the duration of the timer, and the processing unit 630 is further configured to: when the timer is started according to the timer information, when the timing is When the device times out, before the restored PLMN list is restored to the original PLMN list according to the timer information, when the network reselection indication information is received, the timer is started, and according to the network Reselection indication information, when the timer expires, restore the updated PLMN list to the original PLMN list, or start after returning to the idle state after sending the second request message to the target PLMN The timer, and according to the The network reselection indication information restores the updated PLMN list to the original PLMN list when the timer expires.

As an optional embodiment, the third request message includes second indication information, where the second indication information is used to indicate that the third request message is a request message sent by the terminal device 110 when performing network reselection. .

It should be understood that the apparatus 600 herein is embodied in the form of a functional unit. The term "unit" as used herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (eg, a shared processor, a proprietary processor, or a group) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and/or other suitable components that support the described functionality. In an alternative example, those skilled in the art may understand that the device 600 may be specifically the terminal device 110 in the foregoing embodiment, and the device 600 may be used to perform various processes and/or corresponding to the terminal device 110 in the foregoing method embodiment. Steps, to avoid repetition, will not be repeated here.

FIG. 7 shows a system 700 for network reselection provided by an embodiment of the present application, including an apparatus 500 and an apparatus 600.

FIG. 8 shows an apparatus 800 for network reselection provided by an embodiment of the present application. The apparatus may be an NSF apparatus in the method 200, the method 300, and the method 400. As shown in FIG. 8, the apparatus 800 includes a transceiver 810 and processing. 820.

The transceiver 810 is configured to acquire information about a service required by the terminal device 110; and the transceiver 810 is further configured to acquire, according to the information of the service required by the terminal device 110, a public land communication network PLMN capable of supporting the service; The 820 is configured to generate network reselection indication information according to the PLMN capable of supporting the service, where the network reselection indication information is used by the terminal device to determine the target PLMN.

It should be understood that the device 800 may correspond to the NSF device in the method 200, the method 300, and the method 400, and the corresponding functions of the method 200, the method 300, and the method 400 and the NSF device may be implemented. For brevity, no further details are provided herein.

FIG. 9 shows a device 900 for network reselection provided by an embodiment of the present application. The device may be the terminal device 110 of the method 300 and the method 400. As shown in FIG. 9, the device 900 includes a transceiver 910 and a processor 920.

The transceiver 910 is configured to send a first request message to the core network device 130. The transceiver 910 is further configured to receive network reselection indication information sent by the core network device 130 according to the first request message, where the network is heavy. The selection indication information is used to indicate a public land communication network PLMN capable of supporting the service of the device; the processor 920 is configured to determine the target PLMN according to the network reselection indication information; the transceiver 910 is further configured to use the target PLMN Send a third request message.

It should be understood that the device 900 may correspond to the terminal device 110 in the method 200 and the method 300, and the corresponding functions of the method 200 and the method in the method 300 may be implemented. For brevity, no further details are provided herein.

It should be understood that, in the embodiment of the present application, the processor 820 and the processor 920 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processing (DSP). ), application specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. Professionals can use different methods to implement the described functions for specific applications, but this implementation should not be considered super The scope of this application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A method for network reselection, characterized in that the method comprises:

The network selection function device acquires information of the service required by the terminal device;

The network selection function device acquires a public land communication network PLMN capable of supporting the service according to the information of the service required by the terminal device;

The network selection function device generates network reselection indication information according to the public land communication network PLMN capable of supporting the service, and the network reselection indication information is used by the terminal device to determine the target PLMN.
The method according to claim 1, wherein the network selection function device acquires information of a service required by the terminal device, including:

Receiving, by the network selection function device, a first request message;

The network selection function device acquires information about the service required by the terminal device according to the first request message.
The method according to claim 2, wherein the network selection function device acquires information of the service required by the terminal device according to the first request message, including:

The network selection function device queries the subscription database according to the first request message;

The network selection function device acquires information about the service required by the terminal device from the subscription database.
The method of claim 3, wherein the method further comprises:

The network selection function device obtains first indication information from the subscription database, where the first indication information is used to indicate that the terminal device is allowed to perform network reselection;

The network selection function device acquires the public land communication network PLMN capable of supporting the service according to the information of the service required by the terminal device, including:

The network selection function device acquires the PLMN capable of supporting the service according to the first indication information and the information of the service required by the terminal device.
The method according to any one of claims 2 to 4, wherein the receiving, by the network selection function device, the first request message comprises:

Receiving, by the network selection function device, the first request message sent by the terminal device, or

The network selection function device receives the first request message sent by the mobility management function device or the session function management device.
The method according to claim 1, wherein the network selection function device acquires information of a service required by the terminal device, including:

The network selection function device receives information of the service required by the terminal device sent by the mobility management function device or the session function management device.
The method according to any one of claims 1 to 6, wherein the network selection function device acquires a PLMN capable of supporting the service according to the information of the service required by the terminal device, including:

The network selection function device acquires a network policy;

The network selection function device acquires the PLMN capable of supporting the service according to the information of the service required by the terminal device and the network policy.
The method according to claim 7, wherein the network selection function device acquires a network policy, including:

The network selection function device sends a second request message to the policy control function device, where the second request message And configured to request the network policy, where the network policy includes identifier information of the PLMN that can support the service of the terminal device, and information about the service that the target PLMN can support;

The network selection function device receives the network policy sent by the policy control function device according to the second request message.
The method according to any one of claims 1 to 8, wherein the network reselection indication information is further used to indicate identification information of the PLMN capable of supporting the service of the terminal device, or The network reselection indication information is further used to indicate the identifier information of the PLMN capable of supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service, where the priority information is used by the terminal device to update the original The priority corresponding to the PLMN held by the terminal device in the PLMN list is updated with the PLMN list.
The method according to claim 9, wherein the network reselection indication information comprises timer information, and the timer information is used to indicate that the terminal device, after the timer expires, The PLMN list is restored to the original PLMN list.
A method for network reselection, characterized in that the method comprises:

The terminal device sends a first request message to the core network device;

The terminal device receives the network reselection indication information sent by the core network device according to the first request message, where the network reselection indication information is used to indicate a public land communication network PLMN capable of supporting the service of the terminal device;

Determining, by the terminal device, the target PLMN according to the network reselection indication information;

The terminal device sends a third request message to the target PLMN.
The method according to claim 11, wherein the first request message includes information of a service required by the terminal device.
The method according to claim 11 or 12, wherein the network reselection indication information is used to indicate the identification information of the PLMN capable of supporting the service of the terminal device;

The determining, by the terminal device, the target PLMN according to the network reselection indication information, including:

The terminal device determines the target PLMN according to the identifier information of the PLMN that can support the service of the terminal device indicated by the network reselection indication information.
The method according to claim 11 or 12, wherein the network reselection indication information is further used to indicate the identification information of the PLMN capable of supporting the service of the terminal device and the PLMN capable of supporting the service. Priority information

The determining, by the terminal device, the target PLMN according to the network reselection indication information, including:

And updating, by the terminal device, the updated PLMN list according to the priority information and the identifier information of the PLMN that can support the service of the terminal device, and the priority corresponding to the PLMN in the original PLMN list saved by the terminal device;

The terminal device determines the target PLMN in the updated PLMN list.
The method according to claim 14, wherein the network reselection indication information comprises timer information, after the terminal device determines the target PLMN in the updated PLMN list, the method Also includes:

The terminal device starts the timer, and when the timer expires, the terminal device restores the updated PLMN list to the original PLMN list according to the timer information.
The method according to claim 15, wherein the timer information is specifically used to indicate timing The duration of the device is started by the terminal device, and when the timer expires, the terminal device restores the updated PLMN list to the original PLMN list according to the timer information. The method further includes:

Determining, by the terminal device, a duration of the timer according to the timer information;

The terminal device starts the timer, and when the timer expires, the terminal device restores the updated PLMN list to the original PLMN list according to the timer information, including:

When receiving the network reselection indication information, the terminal device starts the timer, and when the timer expires, restores the updated PLMN list to the original PLMN list, or

After the terminal device returns to the idle state after sending the second request message to the target PLMN, the terminal starts the timer, and when the timer expires, restores the updated PLMN list to the original PLMN list.
A device for network reselection, characterized in that the device comprises:

a receiving unit, configured to acquire information about a service required by the terminal device;

The receiving unit is further configured to acquire, according to the information of the service required by the terminal device, a public land communication network PLMN capable of supporting the service;

And a processing unit, configured to generate network reselection indication information according to the PLMN capable of supporting the service, where the network reselection indication information is used by the terminal device to determine the target PLMN.
The device according to claim 17, wherein the receiving unit is specifically configured to:

Receiving a first request message;

Acquiring information of the service required by the terminal device according to the first request message.
The device according to claim 18, wherein the receiving unit is further configured to:

And querying the subscription database according to the first request message, and acquiring information about the service required by the terminal device from the subscription database.
The device according to claim 19, wherein the receiving unit is further configured to:

Acquiring the first indication information from the subscription database, where the first indication information is used to indicate that the terminal device is allowed to perform network reselection;

The receiving unit is further specifically configured to:

Acquiring the PLMN capable of supporting the service according to the first indication information and the information of the service required by the terminal device.
The device according to any one of claims 18 to 20, wherein the receiving unit is further configured to:

Receiving the first request message sent by the terminal device, or

Receiving the first request message sent by the mobility management function device or the session function management device.
The device according to claim 17, wherein the receiving unit is further configured to:

Receiving information of a service required by the terminal device sent by the mobility management function device or the session function management device.
The device according to any one of claims 17 to 22, wherein the receiving unit is further configured to:

Obtain a network policy;

Acquiring the information capable of supporting the service according to the information of the service required by the terminal device and the network policy PLMN.
The device of claim 23, wherein the device further comprises:

a sending unit, configured to send a second request message to the policy control function device, where the second request message is used to request the network policy, where the network policy includes the identifier information of the PLMN capable of supporting the service of the terminal device And information about the service that the target PLMN can support;

The receiving unit is further configured to: receive the network policy that is sent by the policy control function device according to the second request message.
The device according to any one of claims 17 to 24, wherein the network reselection indication information is further used to indicate identification information of the PLMN capable of supporting the service of the terminal device, or The network reselection indication information is further used to indicate the identifier information of the PLMN capable of supporting the service of the terminal device and the priority information of the PLMN capable of supporting the service, where the priority information is used by the terminal device to update the original The priority corresponding to the PLMN held by the terminal device in the PLMN list is updated with the PLMN list.
A device for network reselection, characterized in that the device comprises:

a sending unit, configured to send a first request message to the core network device;

a receiving unit, configured to receive network reselection indication information sent by the core network device according to the first request message, where the network reselection indication information is used to indicate a public land communication network PLMN capable of supporting services of the device;

a processing unit, configured to determine a target PLMN according to the network reselection indication information;

The sending unit is further configured to send a third request message to the target PLMN.
The apparatus of claim 26, wherein the first request message includes information of a service required by the device.
The device according to claim 26 or 27, wherein the network reselection indication information is used to indicate the identification information of the PLMN capable of supporting the service of the terminal device;

The processing unit is specifically configured to determine the target PLMN according to the identifier information of the PLMN that can support the service of the terminal device indicated by the network reselection indication information.
The apparatus according to claim 26 or 27, wherein the network reselection indication information is further used to indicate the identification information of the PLMN capable of supporting the service of the terminal device and the PLMN capable of supporting the service Priority information

The processing unit is further configured to:

Updating, according to the priority information, a priority of the PLMN corresponding to the PLMN in the original PLMN list saved by the device, to obtain an updated PLMN list;

Determining the target PLMN in the updated PLMN list according to the identity information of the PLMN capable of supporting the service of the terminal device.
The device according to claim 29, wherein the network reselection indication information comprises timer information, and the timer information is used to indicate that the terminal device sends the updated PLMN when a timer expires. The list is restored to the original PLMN list;

The processing unit is further configured to start the timer after determining the target PLMN in the updated PLMN list, and when the timer expires, the updated PLMN according to the timer information The list is restored to the original PLMN list.