Satellite communication method and apparatus

A satellite communication method, comprising:

• determining, by a first communication apparatus, a global navigation satellite system (GNSS) validity duration;
• sending, by a second communication apparatus, a timing advance command (TAC) to the first communication apparatus, wherein the TAC is received by the first communication apparatus within the GNSS first validity duration;
• determining, by the first communication apparatus, an extension duration of the GNSS validity duration based on a validity duration of the TAC, wherein a starting point of the extension duration is an ending point of the GNSS validity duration, and an ending point of the extension duration is an ending point of the validity duration of the TAC;
• and
• performing, by the first communication apparatus, a GNSS measurement or entering, by the first communication apparatus, an idle state, in response to the GNSS validity duration ending and no information for triggering the GNSS measurement being received.

A first communication apparatus, comprising:

• at least one processor;
• and
• one or more memories having instructions stored thereon that, when executed by the at least one processor, cause the first communication apparatus to:
• determine a global navigation satellite system (GNSS) validity duration;
• and
• receive a timing advance command (TAC) from a second communication apparatus, wherein the TAC is received within the GNSS first validity duration,
• determine an extension duration of the GNSS validity duration based on the validity duration of the TAC, wherein a starting point of the extension duration is an ending point of the GNSS validity duration, and an ending point of the extension duration is an ending point of the validity duration of the TAC;
• perform a GNSS measurement or enter an idle state, in response to the GNSS validity duration ending and no information for triggering the GNSS measurement being received.