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CN-122001439-A - Communication method, device, system and medium

CN122001439ACN 122001439 ACN122001439 ACN 122001439ACN-122001439-A

Abstract

The application discloses a communication method, a device, a system and a medium, which relate to the technical field of communication, the network side equipment sends a downlink message to the terminal on a downlink shared channel PDSCH, and the downlink message carries ephemeris information of the satellite. Compared with the prior art that the ephemeris information of the satellite is sent on the frequency domain where CORESET #0 is located, the method and the device for acquiring the ephemeris information of the satellite by the signaling message of the control plane are used for acquiring the SIB message when the BWP distributed by the part RedCap terminal does not contain CD-SSB and CORESET #0, and the problem of control plane signaling storm caused by acquiring the ephemeris information of the satellite on the control plane is avoided, so that the performance of a communication system is improved.

Inventors

  • WANG CHUNSHENG
  • LI JIFENG
  • YAN HONG

Assignees

  • 上海卫星互联网研究院有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (20)

  1. 1. A communication method, applied to a network side device, the method comprising: And sending a downlink message to the terminal on a downlink shared channel PDSCH, wherein the downlink message carries ephemeris information of the satellite.
  2. 2. The method of claim 1, wherein the sending the downlink message to the terminal on the downlink shared channel PDSCH comprises: And sending the downlink message to the terminal in the downlink shared channel PDSCH according to a preset issuing period, wherein the issuing period is smaller than a preset duration.
  3. 3. The method of claim 2, wherein the method further comprises, before the downlink shared channel PDSCH sends the downlink message to the terminal according to a preset downlink period: And determining the preset duration based on the value of the non-terrestrial network-uplink synchronization validity period ntn-UlSyncValidityDuration cell in the system message SIB 19.
  4. 4. The method of claim 1, wherein the method further comprises, before the downlink shared channel PDSCH sends the downlink message to the terminal: and receiving an uplink message sent by the terminal.
  5. 5. The method of claim 4, wherein the receiving the uplink message sent by the terminal comprises: and receiving an uplink message sent by the terminal by an uplink shared channel (PUSCH).
  6. 6. The method of claim 1, wherein a logical channel identification LCID cell in the downlink message takes a first value, wherein the first value is used to characterize ephemeris information of the satellite carried in the downlink message.
  7. 7. The method of claim 1, wherein an ephemeris type EPHEMERISTYPE cell is configured in the downlink message, wherein the EPHEMERISTYPE cell value is used to characterize a format of ephemeris information for the satellite.
  8. 8. The method of claim 4, wherein the logical channel identification LCID cell in the uplink message takes a second value, wherein the second value is used to characterize the uplink message for requesting ephemeris information of the satellite.
  9. 9. A communication method, applied to a terminal, the method comprising: Receiving a downlink message sent by network equipment at a downlink shared channel PDSCH; and acquiring ephemeris information of the satellite carried in the downlink message.
  10. 10. The method of claim 9, wherein the receiving, by the network side device, the downlink message on the downlink shared channel PDSCH includes: and receiving the downlink message sent by the network side equipment according to a preset downlink period in a downlink shared channel PDSCH, wherein the downlink period is smaller than a preset duration.
  11. 11. The method of claim 9, wherein before the downlink shared channel PDSCH receives the downlink message sent by the network side device, the method further comprises: and sending an uplink message to the network side equipment.
  12. 12. The method of claim 11, wherein sending an uplink message to the network side device comprises: and sending an uplink message to the network equipment by using an uplink shared channel (PUSCH).
  13. 13. The method of claim 9, wherein the logical channel identification LCID cell in the downlink message takes a first value, wherein the first value is used to characterize ephemeris information of the satellite carried in the downlink message.
  14. 14. The method of claim 9, wherein an ephemeris type EPHEMERISTYPE cell is configured in the downlink message, wherein the EPHEMERISTYPE cell value is used to characterize a format of ephemeris information for the satellite.
  15. 15. The method of claim 11, wherein the logical channel identification LCID cell in the uplink message takes a second value, wherein the second value is used to characterize the uplink message for requesting ephemeris information of the satellite.
  16. 16. The method of claim 13, wherein after the obtaining the ephemeris information of the satellite carried in the downlink message, the method further comprises: Determining the format of the ephemeris information of the satellite according to the value of the EPHEMERISTYPE cells configured in the downlink message, and converting the acquired ephemeris information of the satellite carried in the downlink message into an ephemeris data structure of the format.
  17. 17. A communication device comprising means or modules for performing the method according to any of claims 1-8 or means or modules for performing the method according to any of claims 9-16.
  18. 18. A communication device comprising one or more processors configured to perform the method of any one of claims 1-8 or to perform the method of any one of claims 9-16.
  19. 19. A communication system comprising a satellite performing the method according to any one of claims 1-8, and a terminal performing the method according to any one of claims 9-16.
  20. 20. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program or instructions which, when executed by a communication device, implements the method according to any of claims 1-8 or implements the method according to any of claims 9-16.

Description

Communication method, device, system and medium Technical Field The present application relates to the field of communications technologies, and in particular, to a communications method, apparatus, system, and medium. Background In a satellite communication system, a terminal needs to periodically acquire ephemeris information of a satellite, including geographic position and velocity information, for performing frequency offset and beam azimuth calculation. In the third generation partnership project (3rd Generation Partnership Project,3GPP) standard specification, the system message SIB information (SIB 19) is introduced in version R17 to carry ephemeris information of the present and neighboring satellites. After the terminal reads the SIB19 information, a timer is started/restarted T430, the SIB19 information is read again after the timer is overtime, the time length of the timer is the non-ground network-uplink synchronization validity period ntn-UlSyncValidityDuration information element in the SIB19 information, and the minimum value is 5 seconds. The 3GPP standard introduced the reduced capability RedCap technology in the R17 version, redCap technology only allowing configuration of one fractional bandwidth BWP, which is only 20MHz. The satellite transmits synchronization information blocks CD-SSB and control resources CORESET #0 at the configured BWP. The SIB messages of the cell are all carried on the frequency domain where CORESET #0 is located. For a cell with a large bandwidth (more than 20 MHz), in order to fully use the frequency domain resources of the cell, there is necessarily a part RedCap of BWP allocated by the terminal that does not include CD-SSB and CORESET #0, and the active BWP of the connected terminal UE does not include CORESET #0, which results in that the connected UE cannot directly read SIB message. The 3GPP standard solves the problem that no CD-SSB is contained in BWP by NCD-SSB technology. The 3GPP standard provides for obtaining SIB messages through signaling messages of the signaling plane. The problem in the prior art is that the connected RedCap terminals in the non-terrestrial technology NTN scene need to periodically read SIB19 messages, if the SIB19 messages are acquired through signaling messages of a control plane, the signaling interaction frequency is 3 signaling/5 seconds in the scene of the minimum update period. The signaling interaction of the control plane is frequent, and SIB19 information is acquired through the signaling information on the control plane, so that ephemeris information is acquired, which causes the problem of signaling storm and affects the performance of the communication system. Disclosure of Invention The application provides a communication method, a device, a system and a medium, which are used for solving the problem that signaling storm is caused on a control surface in the prior art. In a first aspect, the present application provides a communication method, applied to a network side device, where the method includes: And sending a downlink message to the terminal on a downlink shared channel PDSCH, wherein the downlink message carries ephemeris information of the satellite. In a possible implementation manner, the sending, by the PDSCH on the downlink shared channel, a downlink message to the terminal includes: And sending the downlink message to the terminal in the downlink shared channel PDSCH according to a preset issuing period, wherein the issuing period is smaller than a preset duration. In a possible implementation manner, before the downlink shared channel PDSCH sends the downlink message to the terminal according to the preset downlink period, the method further includes: And determining the preset duration based on the value of the non-terrestrial network-uplink synchronization validity period ntn-UlSyncValidityDuration cell in the system message SIB 19. In a possible implementation manner, before the downlink shared channel PDSCH sends the downlink message to the terminal, the method further includes: and receiving an uplink message sent by the terminal. In a possible implementation manner, the receiving the uplink message sent by the terminal includes: and receiving an uplink message sent by the terminal by an uplink shared channel (PUSCH). In one possible implementation manner, the logical channel identifier LCID cell in the downlink message takes a first value, where the first value is used to characterize that the downlink message carries ephemeris information of the satellite. In one possible implementation, an ephemeris type EPHEMERISTYPE cell is configured in the downlink message, wherein the value of EPHEMERISTYPE cell is used to characterize the format of the ephemeris information of the satellite. In one possible implementation manner, the logical channel identification LCID cell in the uplink message takes a second value, where the second value is used to characterize the uplink message and is used to reque