Method and apparatus for acquiring uplink transmission timing advance and communication system

A method and apparatus for acquiring uplink transmission timing advance and a communication system. The method includes: a network device obtains a timing advance command value (TA), the TA being related to a first reference subcarrier spacing (SCS) used by a terminal equipment for calculating timing advance (TTA); and the network device transmits a timing advance command (TA command), the TA command including the TA. Hence, the terminal equipment may be assisted in obtaining accurate timing advance of uplink transmission.