US-20260129707-A1 - DATA TRANSMISSION METHOD, APPARATUS, AND SYSTEM

US20260129707A1US 20260129707 A1US20260129707 A1US 20260129707A1US-20260129707-A1

Abstract

This application provides a data transmission method, apparatus, and system, and is applied to the field of communication technologies. The data transmission method provided in this application includes: A terminal device receives a connection release message sent by a first network device, where the connection release message includes first information, the first information indicates the terminal device, and the first information is used to identify the first network device within a first range; and the terminal device sends a connection setup request message to a second network device, where the connection setup request message includes second information, the second information is used to identify the first network device within a second range, and the second range is less than the first range.

Inventors

Haisen ZHANG
Meng Li
Yan Li
Lei Chen

Assignees

HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251219
Priority Date: 20230630

Claims (16)

1 . A data transmission method, wherein the method comprises: receiving, by a terminal device, a connection release message sent by a first network device, wherein the connection release message comprises first information that indicates the terminal device and the first information is used to identify the first network device within a first range; and sending, by the terminal device, a connection setup request message to a second network device, wherein the connection setup request message comprises second information that is used to identify the first network device within a second range, and wherein the second range is less than the first range.
2 . The method according to claim 1 , wherein the method further comprises: receiving, by the terminal device, a connection setup response message that indicates the terminal device to send information used to identify the first network device within the first range; and sending, by the terminal device, a connection setup complete message that comprises third information used to identify the first network device within the first range.
3 . The method according to claim 1 , wherein the method further comprises: receiving, by the terminal device, a connection setup accept message.
4 . The method according to claim 1 , wherein the first information and the second information are further used to identify a terminal device context (UE Context).
5 . The method according to claim 1 , wherein the first information comprises at least one of the following: an enhanced inactive radio network temporary identifier (eI-RNTI); a first part of a network device identifier, a second part of the network device identifier, and a terminal device context identifier (UE context ID); an inactive radio network temporary identifier (I-RNTI) and the network device identifier; or the I-RNTI and the first part of the network device identifier, wherein the first part of the network device identifier and the second part of the network device identifier are used to identify the first network device within the first range, and the second part of the network device identifier is used to identify the first network device within the second range.
6 . The method according to claim 1 , wherein the second information comprises at least one of the following: an I-RNTI; a second part of a network device identifier and a UE context ID; or a first part of the first information, wherein the first part of the first information is used to identify the terminal device within the second range, wherein the second part of the network device identifier is used to identify the first network device within the second range.
7 . The method according to claim 2 , wherein the third information comprises at least one of the following: a part other than a first part of the first information, wherein the first part of the first information is used to identify the first network device within the second range; a first part of a network device identifier; or the first information, wherein the first part of the network device identifier and a second part of the network device identifier are used to identify the first network device within the first range.
8 . A data transmission method, wherein the method comprises: sending, by a first network device, a connection release message comprising first information that is used to identify the first network device within a first range; receiving, by the first network device through a service-based interface, a request message that is for querying for a terminal device context (UE context) and is sent by a second network device; and sending, by the first network device, a UE context of a terminal device to the second network device.
9 . The method according to claim 8 , wherein the request message for querying for the terminal device context comprises at least one of the following: a terminal device context identifier (UE context ID) of the terminal device; an inactive radio network temporary identifier (I-RNTI); or an enhanced inactive radio network temporary identifier (eI-RNTI).
10 . An apparatus, comprising: at least one processor; and a memory coupled to the at least one processor and having program instructions stored thereon which, when executed by the at least one processor, cause the apparatus to: receive a connection release message sent by a first network device, wherein the connection release message comprises first information that indicates a terminal device, and the first information is used to identify the first network device within a first range; and send a connection setup request message to a second network device, wherein the connection setup request message comprises second information that is used to identify the first network device within a second range, and wherein the second range is less than the first range.
11 . The apparatus according to claim 10 , wherein the program instructions further cause the apparatus to: receive a connection setup response message that indicates the terminal device to send information used to identify the first network device within the first range; and send a connection setup complete message that comprises third information used to identify the first network device within the first range.
12 . The apparatus according to claim 10 , wherein the program instructions further cause the apparatus to: receive a connection setup accept message.
13 . The apparatus according to claim 10 , wherein the first information and the second information are further used to identify a terminal device context (UE Context).
14 . The apparatus according to claim 10 , wherein the first information comprises at least one of the following: an enhanced inactive radio network temporary identifier (eI-RNTI); a first part of a network device identifier, a second part of the network device identifier, and a terminal device context identifier (UE context ID); an inactive radio network temporary identifier (I-RNTI) and the network device identifier; or the I-RNTI and the first part of the network device identifier, wherein the first part of the network device identifier and the second part of the network device identifier are used to identify the first network device within the first range, and the second part of the network device identifier is used to identify the first network device within the second range.
15 . The apparatus according to claim 10 , wherein the second information comprises at least one of the following: an I-RNTI; a second part of a network device identifier and a UE context ID; or a first part of the first information, wherein the first part of the first information is used to identify the terminal device within the second range, wherein the second part of the network device identifier is used to identify the first network device within the second range.
16 . The apparatus according to claim 11 , wherein the third information comprises at least one of the following: a part other than a first part of the first information, wherein the first part of the first information is used to identify the first network device within the second range; a first part of a network device identifier; or the first information, wherein the first part of the network device identifier and a second part of the network device identifier are used to identify the first network device within the first range.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2024/094822, filed on May 23, 2024, which claims priority to Chinese Patent Application No. 202310802673.8, filed on Jun. 30, 2023. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a data transmission method, apparatus, and system. BACKGROUND In an NR (New Radio) technology, an access network manages a terminal device context and is responsible for partial mobility management. For example, in the NR technology, an RRC_INACTIVE state (radio resource control-inactive state) is changed from an RRC_CONNECTED state (radio resource control-connected state) by using an RRC release message. When a terminal device is released from the RRC_CONNECTED state to the RRC_INACTIVE state, a network device allocates an identifier, namely, an I-RNTI (inactive radio network temporary identifier), to the terminal device, and stores a terminal device context by using the identifier. The network device is also referred to as a last serving gNB of the UE, and is sometimes denoted as an anchor gNB. When the terminal device requests to resume a previously suspended radio resource control (RRC) connection or update a RAN-based notification area (RNA), the terminal device sends an RRCResumeRequest message to a current network device. For example, the I-RNTI is used by the network device to address the terminal device in RRC signaling, and the I-RNTI includes a part used to identify the terminal device and a part used to identify the network device. In conventional technologies, it is difficult to identify a unique network device within a network-wide range by using an identifier sent by a network device to a terminal device during mobility management. SUMMARY Embodiments of this application provide a data transmission method, apparatus, and system, to resolve a problem that it is difficult to identify a unique network device within a network-wide range by using an identifier sent by a network device to a terminal device during mobility management. To achieve the foregoing objective, the following technical solutions are used in embodiments of this application. According to a first aspect, a data transmission method is provided. The method may be performed by a terminal device, or may be performed by a component (for example, a processor, a chip, or a chip system) of the terminal device, or may be implemented by a logical module or software that can implement all or some functions of the terminal device. The following uses an example in which the method is performed by the terminal device for description. The method includes: The terminal device receives a connection release message sent by a first network device, where the connection release message includes first information, the first information indicates the terminal device, and the first information is used to identify the first network device within a first range; and the terminal device sends a connection setup request message to a second network device, where the connection setup request message includes second information, the second information is used to identify the first network device within a second range, and the second range is less than the first range. According to the foregoing method, the terminal device receives the first information sent by the first network device. The first information may be used to identify the first network device within a global range. Some or all information in the first information may be used by the terminal device to retrieve a terminal device identifier of a unique UE within a network-wide range when a connection is subsequently set up between the terminal device and another network device (for example, the second network device). In this case, the another network device (for example, the second network device) can accurately identify and find the terminal device within the network-wide range. In an embodiment, the terminal device receives a connection setup response message, where the connection setup response message indicates the terminal device to send information used to identify the first network device within the first range; and the terminal device sends a connection setup complete message, where the connection setup complete message includes third information, and the third information is used to identify the first network device within the first range. In an embodiment, the terminal device receives a connection setup accept message. In an embodiment, the first information and the second information are further used to identify a terminal device context (UE Context). In an embodiment, the first information includes one of the following: an enhanced inactive radio network temporary identifier (eI-RNTI);a first part of a network device identifier, a se