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EP-4742717-A1 - CAPABILITY SYNCHRONIZATION METHOD AND SYSTEM, AND RELATED APPARATUS

EP4742717A1EP 4742717 A1EP4742717 A1EP 4742717A1EP-4742717-A1

Abstract

This application discloses a capability synchronization method, a system, and a related apparatus. A UE includes an NTN communication module and a mobile communication module. After the mobile communication module registers with a TN-CN, the NTN communication module performs a registration procedure of an NTN-CN via the mobile communication module, a TN-RAN, and the TN-CN. The NTN-CN obtains NTN air interface capability information of the UE from the NTN communication module via the TN-CN, the TN-RAN, and the mobile communication module. In this way, because the NTN-CN obtains the NTN air interface capability information of the UE in a TN network, the NTN-CN does not need to obtain the NTN air interface capability information of the UE again in an NTN. This reduces signaling overheads for transmitting the NTN air interface capability information of the UE between the UE and the non-terrestrial network core network, reduces time required by the UE to transmit the NTN air interface capability information of the UE in the NTN, and reduces power consumption of the UE.

Inventors

  • ZHANG, YUNJI
  • DOU, Fenghui

Assignees

  • Huawei Technologies Co., Ltd.

Dates

Publication Date
20260513
Application Date
20241025

Claims (20)

  1. A capability synchronization method, applied to a communication system, wherein the communication system comprises a user equipment UE, a non-terrestrial network core network NTN-CN device, a non-terrestrial network radio access network NTN-RAN device, and a terrestrial network device; and the method comprises: receiving, by the UE, a first non-terrestrial network air interface capability request sent by the terrestrial network device, and sending a first non-terrestrial network air interface capability message to the terrestrial network device, wherein the first non-terrestrial network air interface capability message comprises NTN air interface capability information of the UE; sending, by the terrestrial network device, a second non-terrestrial network air interface capability message to the NTN-CN device, wherein the second non-terrestrial network air interface capability message comprises the NTN air interface capability information of the UE; finding, by the UE, an NTN, and sending a first mobility registration request message to the NTN-CN device via the NTN-RAN device, wherein the first mobility registration request message is used by the UE to register with the NTN-CN device; and sending, by the NTN-CN device, the NTN air interface capability information of the UE to the NTN-RAN device after receiving the first mobility registration request message.
  2. The method according to claim 1, wherein before receiving, by the UE, the first non-terrestrial network air interface capability request, the method further comprises: after the UE registers with the NTN-CN device via the terrestrial network device, sending, by the NTN-CN device, a second non-terrestrial network air interface capability request to the terrestrial network device, wherein the second non-terrestrial network air interface capability request is used by the NTN-CN device to obtain the NTN air interface capability information of the UE; and sending, by the terrestrial network device, the first non-terrestrial network air interface capability request to the UE after receiving the second non-terrestrial network air interface capability request.
  3. The method according to claim 2, wherein the terrestrial network device comprises a terrestrial network radio access network TN-RAN device and a terrestrial network core network TN-CN device; and sending, by the terrestrial network device, the first non-terrestrial network air interface capability request to the UE after receiving the second non-terrestrial network air interface capability request specifically comprises: receiving, by the TN-CN device, the second non-terrestrial network air interface capability request, and sending the first non-terrestrial network air interface capability request to the TN-RAN device; and receiving, by the TN-RAN device, the first non-terrestrial network air interface capability request, and sending the first non-terrestrial network air interface capability request to the UE.
  4. The method according to claim 2, wherein the terrestrial network device comprises a TN-CN device and a TN-RAN device; and sending, by the terrestrial network device, the first non-terrestrial network air interface capability request to the UE after receiving the second non-terrestrial network air interface capability request specifically comprises: receiving, by the TN-CN device, the second non-terrestrial network air interface capability request, and sending the second non-terrestrial network air interface capability request to the TN-RAN device; and receiving, by the TN-RAN device, the second non-terrestrial network air interface capability request, and sending the first non-terrestrial network air interface capability request to the UE.
  5. The method according to claim 1, wherein the terrestrial network device comprises a TN-RAN device; and before receiving, by the UE, the first non-terrestrial network air interface capability request, the method further comprises: after the UE registers with the NTN-CN device via the TN-RAN device, sending, by the NTN-CN device, a second non-terrestrial network air interface capability request to the TN-RAN device, wherein the second non-terrestrial network air interface capability request is used by the NTN-CN device to obtain the NTN air interface capability information of the UE; and sending, by the TN-RAN device, the first non-terrestrial network air interface capability request to the UE after receiving the second non-terrestrial network air interface capability request.
  6. The method according to any one of claims 1 to 5, wherein sending, by the terrestrial network device, the second non-terrestrial network air interface capability message to the NTN-CN device specifically comprises: sending, by the terrestrial network device, the second non-terrestrial network air interface capability message to the NTN-CN device in response to the first non-terrestrial network air interface capability message.
  7. The method according to claim 6, wherein the first non-terrestrial network air interface capability message is a user equipment capability information UE Capability Information message, and the second non-terrestrial network air interface capability message is a user equipment capability information indication UE Capability Infor Indication message.
  8. The method according to claim 1, wherein the terrestrial network device comprises a TN-CN device; and before receiving, by the UE, the first non-terrestrial network air interface capability request, the method further comprises: sending, by the terrestrial network device, the first non-terrestrial network air interface capability request to the UE after the UE registers with the TN-CN device via the terrestrial network device.
  9. The method according to claim 8, wherein sending, by the terrestrial network device, the first non-terrestrial network air interface capability request to the UE specifically comprises: sending, by the UE, a first capability change message to the TN-CN device after the UE registers with the TN-CN device via the terrestrial network device, wherein the first capability change message indicates an NTN air interface capability change of the UE; sending, by the TN-CN device, a second non-terrestrial network air interface capability request to a TN-RAN device in response to the first capability change message; and sending, by the TN-RAN device, the first non-terrestrial network air interface capability request to the UE in response to the second non-terrestrial network air interface capability request; or sending, by the TN-CN device, the first non-terrestrial network air interface capability request to the UE via the TN-RAN device in response to the first capability change message.
  10. The method according to claim 9, wherein the first capability change message is a second mobility registration request message, and the second mobility registration request message comprises a parameter indicating that an NTN air interface capability of the UE changes; or the first capability change message is a user equipment capability release command message.
  11. The method according to any one of claims 8 to 10, wherein the method further comprises: sending, by the NTN-CN device, a first capability synchronization message to the TN-CN device after receiving the first mobility registration request message, wherein the first capability synchronization message is used to obtain the NTN air interface capability information of the UE from the TN-CN device; and sending, by the terrestrial network device, the second non-terrestrial network air interface capability message to the NTN-CN device specifically comprises: sending, by the TN-CN device, the second non-terrestrial network air interface capability message to the NTN-CN device in response to the first capability synchronization message.
  12. The method according to any one of claims 1 to 11, wherein sending the NTN air interface capability information of the UE to the NTN-RAN device specifically comprises: sending, by the NTN-CN device, an initial context setup request message to the NTN-RAN device, wherein the initial context setup request message comprises the NTN air interface capability information of the UE.
  13. The method according to any one of claims 1 to 12, wherein the first non-terrestrial network air interface capability request is a user equipment capability enquiry UE capability enquiry (NTN) message, and the second non-terrestrial network air interface capability request is a non-terrestrial network air interface capability information request NTN capability info request.
  14. The method according to any one of claims 1 to 13, wherein the NTN air interface capability information comprises a carrier supported by the UE, an antenna polarization direction of the UE, maximum transmit power of the UE, and a duplex mode of the UE.
  15. A capability synchronization method, applied to a user equipment UE, wherein the method comprises: receiving, by the UE, a first non-terrestrial network air interface capability request sent by a terrestrial network device, wherein the first non-terrestrial network air interface capability request is used to obtain NTN air interface capability information of the UE; sending, by the UE, a first non-terrestrial network air interface capability message to the terrestrial network device after receiving the first non-terrestrial network air interface capability request, wherein the first non-terrestrial network air interface capability message comprises the NTN air interface capability information of the UE; and sending, by the UE, a mobility registration request message to a non-terrestrial network core network NTN-CN device after finding a non-terrestrial network NTN, wherein the mobility registration request message is used to trigger the NTN-CN device to send the NTN air interface capability information of the UE to an NTN-RAN device.
  16. The method according to claim 15, wherein before receiving, by the UE, the first non-terrestrial network air interface capability request sent by the terrestrial network device, the method further comprises: registering, by the UE, with the NTN-CN device via the terrestrial network device.
  17. The method according to claim 15, wherein before receiving, by the UE, the first non-terrestrial network air interface capability request sent by the terrestrial network device, the method further comprises: registering, by the UE, with a TN-CN device.
  18. The method according to any one of claims 15 to 17, wherein before receiving, by the UE, the first non-terrestrial network air interface capability request sent by the terrestrial network device, the method further comprises: sending, by the UE, a first capability change message to the TN-CN device, wherein the first capability change message indicates that an NTN air interface capability of the UE changes.
  19. A capability synchronization method, applied to a non-terrestrial network core network NTN-CN device, wherein the method comprises: sending, by the NTN-CN device, a first non-terrestrial network air interface capability request to a user equipment UE via a terrestrial network device, wherein the first non-terrestrial network air interface capability request is used to obtain NTN air interface capability information of the UE; receiving, by the NTN-CN device via the terrestrial network device, a first non-terrestrial network air interface capability message sent by the UE, wherein the first non-terrestrial network air interface capability message comprises the NTN air interface capability information of the UE; and sending, by the NTN-CN device, the NTN air interface capability information of the UE to a non-terrestrial network radio access network NTN-RAN device after receiving a first mobility registration request message sent by the UE, wherein the first mobility registration request message is used by the UE to register with the NTN-CN device.
  20. The method according to claim 19, wherein before sending, by the NTN-CN device, the first non-terrestrial network air interface capability request to the UE via the terrestrial network device, the method further comprises: receiving, by the NTN-CN device, an initial registration request of the UE via the terrestrial network device.

Description

This application claims priority to Chinese Patent Application No. 202311427500.9, filed with the China National Intellectual Property Administration on October 28, 2023 and entitled "CAPABILITY SYNCHRONIZATION METHOD, SYSTEM, AND RELATED APPARATUS", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the communication field, and in particular, to a capability synchronization method, a system, and a related apparatus. BACKGROUND Currently, some user equipments (user equipments, UEs) support a non-terrestrial network (non-terrestrial network, NTN) communication function. With development of communication technologies, more UEs will support the NTN communication function in the future. The UE having the NTN communication function can perform communication via a satellite in an area that is not covered or cannot be covered with mobile communication or in which a communication system is damaged, for example, an ocean, a desert, a grassland, a high altitude, or a no man's land. In a process in which the UE communicates with a non-terrestrial network device, the non-terrestrial network device needs to provide a corresponding communication resource for the UE based on NTN air interface capability information of the UE. Because the UE has a large amount of NTN air interface capability information, when sending the NTN air interface capability information of the UE to the non-terrestrial network device, the UE needs to occupy more air interface resources. Consequently, transmission time is long, and power consumption of the UE is high. SUMMARY This application provides a capability synchronization method, a system, and a related apparatus. A UE includes an NTN communication module and a mobile communication module. The mobile communication module obtains registration information of the NTN communication module. After the mobile communication module registers with a terrestrial network core network, the NTN communication module performs a registration procedure of a non-terrestrial network core network via the mobile communication module and the terrestrial network core network. The non-terrestrial network core network obtains NTN air interface capability information of the UE from the NTN communication module of the UE via the terrestrial network core network. After finding an NTN-RAN, the NTN communication module of the UE accesses the non-terrestrial network core network. The non-terrestrial network core network obtains the NTN air interface capability information of the UE in a terrestrial network. This reduces an air interface resource of a non-terrestrial network, and further reduces time for transmitting the NTN air interface capability information of the UE between the UE and the non-terrestrial network core network in the non-terrestrial network. According to a first aspect, this application provides a capability synchronization method, applied to a communication system. The communication system includes a user equipment UE, a non-terrestrial network core network NTN-CN device, a non-terrestrial network radio access network NTN-RAN device, and a terrestrial network device. The method includes: The UE receives a first non-terrestrial network air interface capability request sent by the terrestrial network device, and sends a first non-terrestrial network air interface capability message to the terrestrial network device, where the first non-terrestrial network air interface capability message includes NTN air interface capability information of the UE; the terrestrial network device sends a second non-terrestrial network air interface capability message to the NTN-CN device, where the second non-terrestrial network air interface capability message includes the NTN air interface capability information of the UE;the UE finds an NTN, and sends a first mobility registration request message to the NTN-CN device via the NTN-RAN device, where the first mobility registration request message is used by the UE to register with the NTN-CN device; andthe NTN-CN device sends the NTN air interface capability information of the UE to the NTN-RAN device after receiving the first mobility registration request message. In this way, the UE can send the NTN air interface capability information to the terrestrial network device in a TN, and the NTN-CN device may not need to obtain the NTN air interface capability information of the UE in the NTN, thereby reducing an air interface resource of the NTN. In some examples, that the UE finds the NTN indicates that the UE receives a signal sent by the NTN-RAN. In a possible implementation, before the UE receives the first non-terrestrial network air interface capability request, the method further includes: After the UE successfully registers with the NTN-CN device via the terrestrial network device, the NTN-CN device sends a second non-terrestrial network air interface capability request to the terrestrial network device, where the sec