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

Claim 13:
14. A timing advance update method, comprising:
receiving, from a base station and by a terminal, an updated timing advance (TA) value and a beam cell identity of a beam cell in which the terminal is located;
obtaining, by the terminal, 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 Doppler frequency offset of the current beam cell, and wherein the terminal obtains a round-trip transmission delay change rate of a current location based on the Doppler frequency offset and a carrier frequency according to the following formula:, T
    a
    ′
   
   =
   
    
     2
     
      f
      c
     
    
    ⁢
    
     f
     d
    
   
  
  ,, wherein
T′α represents the round-trip transmission delay change rate of the current location, ƒc represents the carrier frequency, and ƒd represents a Doppler frequency offset of the current location;
performing, by the terminal, TA compensation in a TA update period based on the updated TA value and the TA compensation information; and
sending, by the terminal, uplink data by using a TA value obtained after TA compensation is performed.