Patent ID: 11968640
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A terminal, comprising:
a memory storing instructions; and
at least one processor coupled to the memory-, wherein the instructions for execution by the at least one processor, and wherein the instructions instruct the at least one processor to:
receive, from a base station, an updated timing advance TA value and a beam cell identity of a beam cell in which the terminal is located;
obtain corresponding TA compensation information based on the beam cell identity, wherein the TA compensation information comprises reference data, wherein the reference data comprises a maximum TA offset and a minimum transmission delay TA. offset of a current beam cell, and the reference data comprises a satellite orbital altitude of a satellite and geocentric angle data of the current beam cell, wherein the geocentric angle data comprises a maximum geocentric angle and a minimum geocentric angle, and wherein the terminal obtains, based on the geocentric angle data and the satellite orbital altitude, a round-trip transmission delay change rate of a location corresponding to the geocentric angle data according to the following formula:, T
   a
   ′
  
  =
  
   
    2
    c
   
   ×
   
    
     
      ω
      ⁢
      
       R
       ⁡
       (
       
        R
        +
        h
       
       )
      
      ⁢
      sin
      ⁢
      θ
     
     
      
       
        R
        2
       
       +
       
        
         (
         
          R
          +
          h
         
         )
        
        2
       
       -
       
        2
        ⁢
        
         R
         ⁡
         (
         
          R
          +
          h
         
         )
        
        ⁢
        cos
        ⁢
        θ
       
      
     
    
    ., wherein

T′α represents the round-trip transmission delay change rate of the location corresponding to the geocentric angle data, c represents a speed of light, ω represents a relative angular velocity between the satellite and a user, R represents an Earth radius, h represents the satellite orbital altitude, and θ represents the geocentric angle data;
perform TA compensation in a TA update period based on the updated TA value and the corresponding TA compensation information; and
send uplink data by using a TA value obtained after TA compensation is performed.