Method and apparatus for adjusting uplink timing in a wireless communication system
A method of adjusting uplink timing in a wireless communication system and an apparatus therefor. A method for a user equipment to adjust uplink timing in a wireless communication system includes transmitting, to a base station, an uplink signal, receiving, from the base station, a timing advance (TA) command configured based on the uplink signal, and performing uplink transmission to the base station by applying a timing advance (TA) indicated by the TA command. The TA command may be interpreted based on subcarrier spacing of at least one frequency resource region to which the TA is to be applied.
1. A method for a user equipment to adjust uplink timing in a wireless communication system, the method comprising:
transmitting, to a base station, a first uplink signal;
receiving, from the base station, a first timing advance (TA) command configured based on the first uplink signal;
transmitting, to the base station, a second uplink signal by applying a timing advance (TA) value based on the first TA command; and
receiving, from the base station, a second TA command for updating the TA value,
wherein the first TA command and the second TA command are configured based on a maximum subcarrier spacing, among subcarrier spacings of a plurality of frequency regions for the user equipment, and
wherein a maximum value of the TA value is configured based on a minimum subcarrier spacing, among the subcarrier spacings.
2. The method of claim 1 , wherein the plurality of frequency regions are included in a same timing advance group (TAG).
3. The method of claim 2 , wherein the first uplink signal is a preamble for random access to the base station, and
wherein the first TA command is included in a random access response transmitted by the base station as a response to the preamble.
4. The method of claim 2 , wherein a field size for the TA value is configured based on the minimum subcarrier spacing.
5. The method of claim 2 , wherein an offset between reception timing of the first TA command and transmission timing of the second uplink signal is configured in a slot unit according to the subcarrier spacing.
6. The method of claim 1 , wherein the second TA command is received through a medium access control-control element (MAC-CE).
7. The method of claim 6 , wherein a radio resource control connection has been set up in the user equipment, and
wherein the second uplink signal is at least one of a physical uplink control channel, a physical uplink shared channel and a sounding reference signal.
8. A user equipment adjusting uplink timing in a wireless communication system, the user equipment comprising:
a transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
transmitting, to a base station, a first uplink signal;
receiving, from the base station, a first timing advance (TA) command configured based on the first uplink signal;
transmitting, to the base station, a second uplink signal by applying a timing advance (TA) value based on the first TA command; and
receiving, from the base station, a second TA command for updating the TA value,
wherein the first TA command and the second TA command are configured based on a maximum subcarrier spacing, among subcarrier spacings of a plurality of frequency regions for the user equipment, and
wherein a maximum value of the TA value is configured based on a minimum subcarrier spacing, among the subcarrier spacings.
9. The user equipment of claim 8 , wherein the plurality of frequency regions are included in a same timing advance group (TAG).
10. The user equipment of claim 9 , wherein the first uplink signal is a preamble for random access to the base station, and
wherein the first TA command is included in a random access response transmitted by the base station as a response to the preamble.
11. The user equipment of claim 8 , wherein the second TA command is received through a medium access control-control element (MAC-CE).