Method for reporting timing advance by terminal device in ntn, terminal device, and network device

A method of a terminal device reporting a Timing Advance TA in a Non Terrestrial Network NTN, comprising:

• transmitting, by a network device, a TA reporting event configuration/reconfiguration message, or a TA reporting function configuration/reconfiguration message to a terminal device in a Radio Access Control RRC connection state, wherein the TA reporting event configuration/reconfiguration message is configured for the terminal device to trigger TA reporting based on a TA reporting event, and the TA reporting function configuration/reconfiguration message is configured for the terminal device to trigger the TA reporting based on a TA reporting function.

A terminal device, comprising:

• a memory, storing executable program codes;
• and
• a processor, coupled to the memory, and configured to trigger TA reporting in response to the terminal device in a Radio Access Control RRC connection state receiving a TA reporting event configuration/reconfiguration message from a network device, or receiving a TA reporting function configuration/reconfiguration message from the network device.

A network device, comprising:

• a memory, storing executable program codes;
• and
• a transceiver, coupled to the memory, and configured to transmit a TA reporting event configuration/reconfiguration message, or a TA reporting function configuration/reconfiguration message to a terminal device in a Radio Access Control RRC connection state, wherein the TA reporting event configuration/reconfiguration message is configured for the terminal device to trigger TA reporting based on a TA reporting event, and the TA reporting function configuration/reconfiguration message is configured for the terminal device to trigger the TA reporting based on a TA reporting function.