CN-122002592-A - Communication method, device and system

Abstract

The disclosure provides a communication method, device and system, and relates to the technical field of mobile communication. The communication method can be executed by core network equipment and comprises the steps of receiving capability indication information sent by user equipment, wherein the capability indication information is used for indicating the user equipment to support a store-and-forward operation, and sending duration indication information of a non-access stratum (NAS) timer corresponding to the store-and-forward operation to the user equipment, wherein the duration indication information is used for configuring the NAS timer of the user equipment. By the method, the success and the high efficiency of NAS flow under the store-and-forward operation can be improved, and the problem that NAS flow of user equipment under the store-and-forward operation fails is solved.

Inventors

• ZONG JIAYING
• NIE HENG
• QI WEN

Assignees

• 中国电信股份有限公司技术创新中心
• 中国电信股份有限公司

Dates

Publication Date

20260508

Application Date

20241101

Claims (20)

1. 1. A method of communication, performed by a core network device, comprising: receiving capability indication information sent by user equipment, wherein the capability indication information is used for indicating the user equipment to support a store-and-forward operation; and sending duration indicating information of the NAS timer of the non-access stratum corresponding to the store-and-forward operation to the user equipment, wherein the duration indicating information is used for configuring the NAS timer of the user equipment.
2. 2. The communication method of claim 1, wherein the NAS timer is of a duration determined from a location of the user equipment, a list of satellites serving the user equipment, and ephemeris information.
3. 3. The communication method according to claim 2, further comprising: Selecting a gateway station farthest from the user equipment from a plurality of gateway stations according to the position of the user equipment and the position information of the plurality of gateway stations, and taking the gateway station farthest from the user equipment as a target gateway station; Determining, from the ephemeris information, a specified time of flight for each satellite in a list of satellites serving the user device, the specified time of flight being the time taken from the satellite to connect to the target gateway station to the satellite reaching a coverage area of the user device; and determining the duration of the NAS timer according to the maximum value of the specified flight time.
4. 4. The communication method according to claim 1, wherein the capability indication information is carried in an attach request message, and the duration indication information is carried in an accept attach message or a reject attach message.
5. 5. The communication method according to claim 1, wherein the capability indication information is carried in a tracking area update request message, and the duration indication information is carried in an accept tracking area update message or a reject tracking area update message.
6. 6. The communication method of claim 1, wherein the capability indication information is carried in a service request message and the duration indication information is carried in a service accept message or a service reject message.
7. 7. The communication method according to claim 1, wherein the capability indication information is carried in a control plane service request message and the duration indication information is carried in an accept control plane service message or a reject control plane service message.
8. 8. The communication method according to any one of claims 1 to 7, wherein the NAS timer is a session management NAS timer.
9. 9. The communication method according to any one of claims 1 to 7, wherein the duration indication information is used to indicate a duration of at least one of a T3482 timer in a packet data network PDN connection establishment procedure, a T3492 timer in a PDN connection disconnection procedure, a T3480 timer in a bearer resource allocation procedure, and a T3481 timer in a bearer resource modification procedure.
10. 10. The communication method according to any of claims 1 to 7, wherein the core network device is a mobility management entity.
11. 11. The communication method of claim 9, wherein at least a portion of the mobility management entity is deployed on a satellite.
12. 12. A method of communication, performed by a user equipment, comprising: transmitting capability indication information to core network equipment, wherein the capability indication information is used for indicating that the user equipment supports a store-and-forward operation; And receiving duration indication information of a non-access stratum (NAS) timer corresponding to the store-and-forward operation from the core network equipment, wherein the duration indication information is used for configuring the NAS timer of the user equipment.
13. 13. The communication method according to claim 12, wherein the capability indication information is carried in an attach request message, and the duration indication information is carried in an accept attach message or a reject attach message.
14. 14. The communication method according to claim 12, wherein the capability indication information is carried in a tracking area update request message, and the duration indication information is carried in an accept tracking area update message or a reject tracking area update message.
15. 15. The communication method of claim 12, wherein the capability indication information is carried in a service request message and the duration indication information is carried in a service accept message or a service reject message.
16. 16. The communication method of claim 12, wherein the capability indication information is carried in a control plane service request message and the duration indication information is carried in an accept control plane service message or a reject control plane service message.
17. 17. A method of communicating as claimed in any of claims 12 to 16, wherein the NAS timer is a session management NAS timer.
18. 18. The communication method according to any one of claims 12 to 16, wherein the duration indication information is used to indicate a duration of at least one of a T3482 timer in a packet data network PDN connection establishment procedure, a T3492 timer in a PDN connection disconnection procedure, a T3480 timer in a bearer resource allocation procedure, and a T3481 timer in a bearer resource modification procedure.
19. 19. A method of communicating according to any of claims 12 to 16, wherein the core network device is a mobility management entity.
20. 20. A communication apparatus, comprising: means for performing the communication method according to any of claims 1 to 11, or 12 to 19.

Description

Communication method, device and system Technical Field The present disclosure relates to the field of mobile communications technologies, and in particular, to a communication method, device, and system. Background In the current standard specifications of the third generation partnership project (3 rd Generation Partnership Project, 3GPP for short), non-terrestrial network (Non-TERRESTRIAL NETWORK, NTN) satellites support only transparent retransmission modes, including transparent retransmission between terrestrial terminals and terrestrial base stations, or between terrestrial base stations and a terrestrial core network. However, due to geographical location and other factors, NTN gateway stations cannot be widely deployed, resulting in coverage limitations. Therefore, the 3GPP SA2 working group considers the satellite regeneration mode in the R19 stage, namely, the base station and/or part of the core network are/is stared in function, so that the dependence on the ground network is reduced, the networking flexibility is improved, and the communication delay is reduced. In view of the deployment limitations of ground gateway stations, the connection between the satellite and the ground may be intermittently or temporarily unavailable. For example, a satellite may experience a disconnection of its feeder link with the ground when servicing terminals under its coverage area. Thus, store-and-forward operations may be provided for delay tolerant or delay insensitive traffic. Specifically, for uplink signal transmission, "storing" refers to storing uplink information from a User Equipment (UE) on the satellite, and "forwarding" refers to forwarding the stored uplink information to the ground network. For downlink signal transmission, "store" refers to storing downlink information from the terrestrial network on the star, and "forward" refers to forwarding the stored downlink information to the UE. For the UE adopting the store-and-forward operation, because the connection between the on-board network and the ground network is intermittently unavailable, the time required for the UE to perform Non-Access-stratum (NAS) signaling interaction with the ground network element is greatly increased compared with the Non-store-and-forward case. The existing NAS timer in the related standard has too short set time, which is difficult to meet the use requirement of the store-and-forward condition. When the NAS timer is too small, the NAS procedure of the UE may fail. Disclosure of Invention The present disclosure provides a communication method, apparatus and system. According to a first aspect of the present disclosure, a communication method is provided, which is executed by a core network device, and includes receiving capability indication information sent by a user device, where the capability indication information is used to indicate that the user device supports a store-and-forward operation, and sending duration indication information of a non-access stratum NAS timer corresponding to the store-and-forward operation to the user device, where the duration indication information is used to configure the NAS timer of the user device. In some embodiments, the NAS timer is of a duration determined from the location of the user equipment, a list of satellites serving the user equipment, and ephemeris information. In some embodiments, the communication method further comprises selecting a gateway station farthest from the user equipment from a plurality of gateway stations according to the position of the user equipment and position information of the plurality of gateway stations, taking the gateway station farthest from the user equipment as a target gateway station, determining a designated flight time of each satellite in a satellite list serving the user equipment according to the ephemeris information, wherein the designated flight time is the time from the satellite to the target gateway station to the time when the satellite reaches a coverage area of the user equipment, and determining the duration of the NAS timer according to the maximum value of the designated flight time. In some embodiments, the capability indication information is carried in an attach request message and the duration indication information is carried in an accept attach message or a reject attach message. In some embodiments, the capability indication information is carried in a tracking area update request message, and the duration indication information is carried in an accept tracking area update message or a reject tracking area update message. In some embodiments, the capability indication information is carried in a service request message and the duration indication information is carried in an accept service message or a reject service message. In some embodiments, the capability indication information is carried in a control plane service request message, and the duration indication information is carried in an accept contro