CN-116032336-B - Method, system and related device for selecting wave beam in satellite communication system

Abstract

The application discloses a beam selection method, a system and a related device in a satellite communication system. The terminal sends a first user frame to the satellite network device, wherein the first user frame carries an outbound link indication field, the outbound link indication field carries beam information of L downlink beams, the outbound link indication field is used for indicating the satellite network device to select a beam of the L downlink beams to send the user frame to the terminal, L is a positive integer, and the terminal receives a second user frame sent by the satellite network device on a first beam of the L downlink beams. Therefore, the selection of the downlink wave beam of the satellite network equipment can be completed without extra signaling overhead, and the channel utilization rate is improved.

Inventors

• ZHONG JILEI
• GAN WENYU
• QIAN FENG
• ZHU XUDONG
• LIU YONGXIANG
• QIU FENGGUANG

Assignees

• 华为终端有限公司

Dates

Publication Date

20260505

Application Date

20211027

Claims (20)

1. 1. A method of beam selection in a satellite communications system, comprising: The method comprises the steps that a terminal sends a first user frame to satellite network equipment, wherein the first user frame carries an outbound link indication field, the outbound link indication field carries beam information of L downlink beams, the outbound link indication field is used for indicating the satellite network equipment to select a beam in the L downlink beams to send the user frame to the terminal, and L is a positive integer; The terminal receives a second user frame sent by the satellite network device to the terminal on a first beam of the L downlink beams.
2. 2. The method of claim 1, wherein prior to the terminal transmitting the first user frame to the satellite network device, the method further comprises: The terminal sequentially captures pilot frequency information in a plurality of satellite beams and acquires the beam signal quality of each satellite beam in the plurality of satellite beams, wherein the pilot frequency information comprises the beam number and the satellite number of the satellite beam; the terminal determines the L downlink beams from the plurality of satellite beams based on beam signal quality of the plurality of captured satellite beams.
3. 3. The method of claim 1, wherein the beam information comprises a satellite number, a beam number, and a beam signal quality, wherein the outbound link indication field comprises L beam information fields including a satellite number field for indicating a satellite number of a downlink beam, a beam number field for indicating a beam number of a downlink beam, and a beam gear field for indicating a level of beam signal quality of a downlink beam.
4. 4. A method according to claim 3, wherein the beam signal quality comprises any one of a carrier-to-noise ratio, a signal-to-noise ratio and a signal strength of the satellite signals in the downstream beam.
5. 5. The method according to any one of claims 1-4, wherein the first user frame is a data request frame, and wherein a frame header of the data request frame includes the outbound link indication field and a subtype indication field, and wherein the subtype indication field is used to indicate a frame type of the data request frame, and wherein the frame type of the data request frame is a generic data frame; The user information of the data request frame comprises a service type field, wherein the service type field is used for indicating the service type of the data request frame, and the service type of the data request frame is a mail box profile query service or a mail downloading request service.
6. 6. The method of claim 5, wherein the frame type of the second user frame is a generic data frame, and wherein the second user frame is a first satellite link control layer protocol data unit, SLC PDU, in a first application layer message generated by the satellite network device based on the data request frame, wherein the first application layer message is split by the satellite network device into one or more SLC PDUs, the one or more SLC PDUs including the first SLC PDU.
7. 7. The method according to any of claims 1-4, wherein the frame type of the first user frame is an acknowledgement identifier, ACK, frame, the outbound link indication field being included in a frame header of the first user frame; Before the terminal transmits the first user frame to the satellite network device, the method further comprises: The terminal receives a second SLC PDU sent by the satellite network device on a second beam, and the first user frame is used for indicating the receiving condition of the terminal on the second SLC PDU.
8. 8. The method of claim 7, wherein the frame type of the second user frame is a generic data frame, and wherein prior to the terminal transmitting the first user frame to the satellite network device, the method further comprises: The terminal sends a data request frame to the satellite network device, wherein the data request frame is used for requesting the satellite network device to generate a first application layer message, the first application layer message is split into a plurality of SLC PDUs by the satellite network device, the plurality of SLC PDUs comprise a first SLC PDU and a second SLC PDU, and the second user frame is the first SLC PDU.
9. 9. The method according to any of claims 1-4, wherein before the terminal transmits the first user frame to the satellite network device, the method further comprises: the terminal splits the second application layer message into one or more SLC PDUs, wherein the one or more SLC PDUs comprise a third SLC PDU; the frame type of the first user frame is a general data frame, the first user frame is the third SLC PDU, the frame type of the second user frame is an ACK frame or a receipt frame, the second user frame is used for indicating the receiving condition of the satellite network device on the third SLC PDU when the second user frame is the ACK frame, and the second user frame is used for indicating the analyzing condition of the satellite network device on the second application layer message when the second user frame is the receipt frame.
10. 10. The method of any of claims 1-4, wherein the frame type of the first user frame is a location report frame or an emergency rescue frame.
11. 11. The method according to claim 2, wherein the terminal sequentially acquires pilot information in a plurality of satellite beams, specifically comprising: the terminal sequentially captures pilot frequency information in the plurality of satellite beams based on a preset satellite beam capturing sequence.
12. 12. The method according to claim 2, wherein the terminal sequentially acquires pilot information in a plurality of satellite beams, specifically comprising: the terminal acquires the position information of the terminal; The terminal determines satellite beam capturing sequences of the plurality of satellite beams based on the position information of the terminal and a satellite beam coverage map, wherein the satellite beam coverage map comprises beam coverage information of each satellite beam, and the beam coverage information comprises one or more of a beam center position, a beam coverage radius, a plurality of signal intensity intervals and coverage edge coordinates of each signal intensity interval in the plurality of signal intensity intervals; the terminal sequentially acquires pilot information in the plurality of satellite beams based on a satellite beam acquisition order of the plurality of satellite beams.
13. 13. The method according to claim 12, wherein the terminal determines a satellite beam acquisition order of the plurality of satellite beams based on the location information of the terminal and a satellite beam coverage map, specifically comprising: The terminal determines the distance between the position of the terminal and the beam center position of each satellite beam in the plurality of satellite beams based on the position information of the terminal and the satellite beam coverage map; The terminal determines a satellite capturing sequence of the plurality of satellite beams based on a distance between a position of the terminal and a beam center position of the plurality of satellite beams.
14. 14. The method according to claim 12, wherein the terminal determines a satellite beam acquisition order of the plurality of satellite beams based on the location information of the terminal and a satellite beam coverage map, specifically comprising: The terminal determines a signal intensity interval of the position of the terminal under each satellite beam in the plurality of satellite beams based on the position information of the terminal and the satellite beam coverage map; the terminal determines a satellite capturing sequence of the plurality of satellite beams based on a signal intensity interval of the position of the terminal under each of the plurality of satellite beams.
15. 15. The method according to any one of claims 12-14, wherein before the terminal determines the satellite beam acquisition order of the plurality of satellite beams based on the location information of the terminal and a satellite beam coverage map, the method further comprises: The terminal receives a satellite beam coverage map sent by a satellite cloud server, wherein the satellite beam coverage map is generated by the satellite cloud server based on a plurality of measuring positions reported by n satellite terminals and beam signal intensity information of satellite beams at the measuring positions, and the beam signal intensity information comprises satellite numbers, beam numbers and beam signal intensities of the satellite beams.
16. 16. A method of beam selection in a satellite communications system, comprising: The method comprises the steps that satellite network equipment receives a first user frame sent by a terminal, wherein the first user frame carries an outbound link indication field, the outbound link indication field carries beam information of L downlink beams, and the outbound link indication field is used for indicating the satellite network equipment to select the beam of the L downlink beams to send the user frame to the terminal, and L is a positive integer; The satellite network device selects a first beam from the L downlink beams to send a second user frame to the terminal.
17. 17. The method of claim 16, wherein the beam information comprises a satellite number, a beam number, and a beam signal quality, wherein the outbound link indication field comprises L beam information fields including a satellite number field for indicating a satellite number of a downlink beam, a beam number field for indicating a beam number of a downlink beam, and a beam gear field for indicating a level of beam signal quality of a downlink beam.
18. 18. The method of claim 17, wherein the beam signal quality comprises any one of a carrier-to-noise ratio, a signal-to-noise ratio, and a signal strength of the satellite signals in the downstream beam.
19. 19. The method according to any of claims 16-18, wherein the first user frame is a data request frame, and wherein the outbound link indication field and a subtype indication field are included in a frame header of the data request frame, and wherein the subtype indication field is used to indicate a frame type of the data request frame, and wherein the frame type of the data request frame is a generic data frame; The user information of the data request frame comprises a service type field, wherein the service type field is used for indicating the service type of the data request frame, and the service type of the data request frame is a mail box profile query service or a mail downloading request service.
20. 20. The method of claim 19, wherein the frame type of the second user frame is a generic data frame, and wherein prior to the satellite network device selecting the first beam from the L downstream beams to transmit the second user frame to the terminal, the method further comprises: the satellite network device generates a first application layer message based on the data request frame; The satellite network device de-queues the first application layer message into one or more SLC PDUs, wherein the one or more SLC PDUs include a first SLC PDU.

Description

Method, system and related device for selecting wave beam in satellite communication system Technical Field The present application relates to the field of satellite communications technologies, and in particular, to a method, a system, and a related device for selecting a beam in a satellite communications system. Background The Beidou satellite navigation system is an important infrastructure which is independently developed in China and integrates positioning, time service and communication. The Beidou short message communication service is one of the characteristics of the Beidou satellite navigation system, which is different from other global navigation systems such as a global positioning system (globalpositioningsystem, GPS), a global satellite navigation system (globalnavigationsatellitesystem, GLONASS), a Galileo satellite navigation system (galileosatellitenavigationsystem, GALILEO) and the like. The Beidou short message communication service is particularly suitable for communication in areas where mobile communication is uncovered or not covered or the communication system is damaged, such as oceans, deserts, grasslands, unmanned areas and the like. The short message system of the Beidou No. three satellite upgrades the short message technology system, opens some necessary resources of the communication system of the Beidou short message service to civilian use, and aims at civilian use service and equipment characteristics, and a communication protocol needs to be designed according to the characteristics of the communication system of the Beidou short message service. Currently, a communication system for short message service in a Beidou three satellite area provides communication service by three synchronous earth orbit (geosynchronousearthorbit, GEO) satellites, each GEO satellite having 6 available downlink beams and 1 selectable beam. In the case of limited hardware resources, the maximum time for the terminal 100 to search for a single beam at a single frequency point may be 51s, and if the beam selection error may affect the speed of the terminal 100 accessing the network device 200. Therefore, how the beidou network device 200 selects the downlink beam to send data to the terminal 100 is a problem to be solved in the beidou communication system. Disclosure of Invention The application provides a method, a system and a related device for selecting a wave beam in a satellite communication system, which can finish the selection of a downlink wave beam of satellite network equipment without extra signaling overhead and improve the utilization rate of a channel. In a first aspect, the present application provides a method for selecting a beam in a satellite communication system, where the method includes that a terminal sends a first user frame to a satellite network device, where the first user frame carries an outbound link indication field, where the outbound link indication field carries beam information of L downlink beams, and the outbound link indication field is used to instruct the satellite network device to select a beam in the L downlink beams to send the user frame to the terminal, where L is a positive integer, and the terminal receives a second user frame sent by the satellite network device to the terminal on a first beam in the L downlink beams. The method for selecting the wave beam in the satellite communication system realizes that the terminal carries the wave beam information of L downlink wave beams in the frame header of the inbound user frame and is used for indicating the satellite network equipment to select the first wave beam from the L downlink wave beams to send the outbound user frame. Therefore, the selection of the downlink wave beam of the satellite network equipment can be completed without extra signaling overhead, and the channel utilization rate is improved. In one possible implementation, before the terminal transmits the first user frame to the satellite network device, the method further includes the terminal capturing pilot information in a plurality of satellite beams in turn and acquiring beam signal quality of each of the plurality of satellite beams, wherein the pilot information includes a beam number and a satellite number of the satellite beam, and determining the L downlink beams from the plurality of satellite beams based on the captured beam signal quality of the plurality of satellite beams. In one possible implementation, the beam information includes a satellite number, a beam number, and a beam signal quality, the outbound link indication field includes L beam information fields including a satellite number field for indicating the satellite number of the downstream beam, a beam number field for indicating the beam number of the downstream beam, and a beam gear field for indicating the level of the beam signal quality of the downstream beam. Wherein the beam signal quality includes any one of a carrier-to-noise ratio, a signal-to-noi