US-12621722-B2 - Inter-network mobility method and apparatus, and communications device

US12621722B2US 12621722 B2US12621722 B2US 12621722B2US-12621722-B2

Abstract

The present disclosure relates to inter-network mobility methods, apparatus, and communications devices. In one example method, a first access device sends a first indication to a terminal device, where the first indication is used to indicate the terminal device to reserve first information after the terminal device moves from a first network to a network other than the first network, and the first information includes one or more of a context of the terminal device in the first network, information about a signaling radio bearer (SRB) in the first network, information about a data radio bearer (DRB) in the first network, an identifier of the terminal device in the first network, information about a first cell in which the first access device provides a service for the terminal device, an identifier of the first network, or a cause value.

Inventors

Chenchen YANG
Yinghao Jin
Feng Han
Huan Li

Assignees

HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20220329

Claims (15)

1 . A transmission method, comprising: determining, by a first access device, a classification of physical cell identifier (PCI) values, wherein the classification of the PCI values comprises a first type of PCI value which is used for a cell in a non-public network (NPN), the first type of PCI value comprises a sub-type of PCI value which is used only for a cell in a public network integrated NPN (PNI-NPN), one or more first PCI values of the PCI values that belong to the sub-type of PCI value are specific values reserved for the PNI-NPN, the one or more first PCI values are used to identify a first network type, and the one or more first PCI values are different from one or more second PCI values of the PCI values corresponding to a second network type; and broadcasting, by the first access device, the classification of the PCI values; wherein the classification of the PCI values further comprises a second type of PCI value which is used only for a cell shared by a public land mobile network (PLMN) and the NPN.
2 . The method according to claim 1 , wherein the classification of the PCI values is broadcast in system information block (SIB).
3 . The method according to claim 1 , wherein the classification of the PCI values further comprises a third type of PCI value which is used only for a cell in the PLMN.
4 . The method according to claim 1 , wherein the classification of the PCI values comprises a plurality of types of PCI value, and each type of PCI value comprises a plurality of sub-types of PCI value.
5 . The method according to claim 1 , wherein the first type of PCI value comprises a second sub-type of PCI value which is used only for a cell in a standalone non-public network (SNPN).
6 . A communication apparatus, comprising: at least one processor; one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to determine a classification of physical cell identifier (PCI) values, wherein the classification of the PCI values comprises a first type of PCI value which is used for a cell in a non-public network (NPN), the first type of PCI value comprises a sub-type of PCI value which is used only for a cell in a public network integrated NPN (PNI-NPN), one or more first PCI values of the PCI values that belong to the sub-type of PCI value are specific values reserved for the PNI-NPN, the one or more first PCI values are used to identify a first network type, and the one or more first PCI values are different from one or more second PCI values of the PCI values corresponding to a second network type; and a transceiver, configured to broadcast the classification of the PCI values; wherein the classification of the PCI values further comprises a second type of PCI value which is used only for a cell shared by a public land mobile network (PLMN) and the NPN.
7 . The apparatus according to claim 6 , wherein the classification of the PCI values is broadcast in system information block (SIB).
8 . The apparatus according to claim 6 , wherein the classification of the PCI values further comprises a third type of PCI value which is used only for a cell in the PLMN.
9 . The apparatus according to claim 6 , wherein the classification of the PCI values comprises a plurality of types of PCI value, and each type of PCI value comprises a plurality of sub-types of PCI value.
10 . The apparatus according to claim 6 , wherein the first type of PCI value comprises a second sub-type of PCI value which is used only for a cell in a standalone non-public network (SNPN).
11 . A non-transitory computer-readable storage medium, comprising a computer program which, when run on a computer, causes the computer to perform operations comprising: determining a classification of physical cell identifier (PCI) values, wherein the classification of the PCI values comprises a first type of PCI value which is used for a cell in a non-public network (NPN), the first type of PCI value comprises a sub-type of PCI value which is used only for a cell in a public network integrated NPN (PNI-NPN), one or more first PCI values of the PCI values that belong to the sub-type of PCI value are specific values reserved for the PNI-NPN, the one or more first PCI values are used to identify a first network type, and the one or more first PCI values are different from one or more second PCI values of the PCI values corresponding to a second network type; and broadcasting the classification of the PCI values; wherein the classification of the PCI values further comprises a second type of PCI value which is used only for a cell shared by a public land mobile network (PLMN) and the NPN.
12 . The medium according to claim 11 , wherein the classification of the PCI values is broadcast in system information block (SIB).
13 . The medium according to claim 11 , wherein the classification of the PCI values further comprises a third type of PCI value which is used only for a cell in the PLMN.
14 . The medium according to claim 11 , wherein the classification of the PCI values comprises a plurality of types of PCI value, and each type of PCI value comprises a plurality of sub-types of PCI value.
15 . The medium according to claim 11 , wherein the first type of PCI value comprises a second sub-type of PCI value which is used only for a cell in a standalone non-public network (SNPN).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2019/109692, filed on Sep. 30, 2019, which is hereby incorporated by reference in its entirety. TECHNICAL FIELD Embodiments of this application relate to the communications field, and more specifically, to an inter-network mobility method and apparatus, and a communications device. BACKGROUND A non-public network (non-public network, NPN) is a network that is being discussed in the 3rd generation partnership project (3rd generation partnership project, 3GPP). Different from a conventional cellular network, the NPN allows access of only some users with specific rights. Two NPN deployment modes are defined in 3GPP: a standalone non-public network (Standalone non-public network, SNPN) and a non-standalone non-public network (non-standalone NPN). The non-standalone NPN is also referred to as a public network integrated NPN (Public Network Integrated NPN, PNI-NPN). A terminal device moves between an NPN and a public land mobile network (public land mobile network, PLMN). After the terminal device moves from a source network to a target network, the target network establishes a session resource for the terminal device. However, a service delay is caused due to a process of establishing the session resource. Therefore, how to reduce a delay caused by reestablishing a session resource when the terminal device moves across networks becomes an urgent problem to be resolved. SUMMARY This application provides an inter-network mobility method and apparatus, and a communications device, so that when a terminal device moves across networks, a configuration of the terminal device in a network can be quickly restored, to reduce complexity and a delay. According to a first aspect, an inter-network mobility method is provided. The method may be performed by an access device or a module (for example, a chip) configured in the access device. Descriptions are provided below by using an example in which the method is performed by the access device. The method includes: A first access device establishes a connection to a terminal device, where the first access device is an access device in a first network. The first access device sends a first indication to the terminal device, where the first indication is used to indicate the terminal device to reserve first information after the terminal device moves from the first network to a network other than the first network, and the first information includes one or more of the following information: a context of the terminal device in the first network, information about a signaling radio bearer SRB in the first network, information about a data radio bearer DRB in the first network, an identifier of the terminal device in the first network, information about a first cell in which the first access device provides a service for the terminal device, an identifier of the first network, a cause value, and an address of an N3IWF connected to the terminal device in the first network. According to the solution of this application, the access device indicates the terminal device to reserve information in the network after the terminal device moves to the network other than the network, so that after moving back to the network, the terminal device can assist, based on the reserved information, in restoring a configuration of the terminal device in the network, to avoid repeated configuration of the information, and reduce complexity and a delay. In addition, after the terminal device moves to the network other than the network, if the terminal device needs to access the network service through the newly accessed network other than the network, procedures such as authentication and registration in the network can be avoided again, to reduce complexity and a delay. Optionally, the first access device sends capability information of the first network to the terminal device. By way of example but not limitation, the capability information is used to indicate whether a first network device and/or a core network device can reserve one or more of a context and a transmission resource of the terminal device in the first network after the terminal device moves from the first network to the network other than the first network. With reference to the first aspect, in some implementations of the first aspect, the first indication includes a first status indication, and the first status indication is used to indicate that the terminal device is in an inactive state in the first network after moving from the first network to the network other than the first network. With reference to the first aspect, in some implementations of the first aspect, the first indication is further used to configure a part or all of the first information for the terminal device. In an implementation, the first indication is used to configure a part or all of the first information. In this implementation, in addition to