Method and apparatus for transmitting time alignment timer report in wireless communication system
The present disclosure relates to a method of transmitting a Time Alignment Timer (TAT) status report by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of configuring one or more Timing Advance Groups (TAGs); receiving a Timing Advance Command (TAC) for one of the one or more TAGS; starting a TAT for the one TAG; triggering the TAT status report when a remaining time of the TAT for the one TAG is less than a threshold for the one TAG; and transmitting the TAT status report to a network, wherein the TAT status report includes a first type indication indicating that the remaining time of the TAT for the one TAG is less than the threshold.
1 . A method comprising:
receiving, by a user equipment (UE), information related to one or more Timing Advance Groups (TAGs);
receiving, by the UE from a network, a Timing Advance Command (TAC) for one TAG of the one or more TAGS;
starting, by the UE, a Time Alignment Timer (TAT) for the one TAG; and
based on a remaining time of the TAT for the one TAG being less than a threshold for the one TAG,
transmitting, by the UE to the network, a TAT status report including,
a first type indication indicating that the remaining time of the TAT for the one TAG is less than the threshold and a second type indication indicating whether the UE wants to keep the TAT for the one TAG running or not.
2 . The method of claim 1 , wherein, based on a number of configured TAGs being greater than 2, the TAT status report further includes first type indications indicating whether the remaining times of the TATs for the one or more TAGS other than the one TAG is less than the threshold or not.
3 . The method of claim 1 , further comprising receiving information about one or more thresholds for the one or more TAGs from the network.
4 . The method of claim 1 , further comprising:
receiving, by the UE from the network, a TAC for the one TAG after transmitting the TAT status report; and
restarting, by the UE, the TAT for the one TAG.
5 . The method of claim 1 , wherein the TAT status report further includes an identifier of the one TAG.
6 . A user equipment (UE) comprising:
at least one processor; and
at least one computer memory storing instructions that, when executed by the at least one processor, cause the UE to perform operations comprising:
receiving information related to one or more Timing Advance Groups (TAGs);
receiving, from a network, a Timing Advance Command (TAC) for one of the one or more TAGs;
starting a Time Alignment Timer (TAT) for the one TAG;
based on a remaining time of the TAT for the one TAG being less than a threshold for the one TAG,
transmitting, to the network, a TAT status report including,
a first type indication indicating that the remaining time of the TAT for the one TAG is less than the threshold and a second type indication indicating whether the UE wants to keep the TAT for the one TAG running or not.
7 . The UE of claim 6 , wherein, based on a number of configured TAGs being greater than 2, the TAT status report further includes first type indications indicating whether the remaining time of the TAT for the one or more TAGS other than the one TAG is less than the threshold or not.
8 . The UE of claim 6 , wherein the operations further comprise receiving information about one or more thresholds for the one or more TAGs from the network.
9 . The UE of claim 6 , wherein the operations further comprise:
receiving, from the network, a TAC for the one TAG after transmitting the TAT status report; and
restarting the TAT for the one TAG.
10 . The UE of claim 6 , wherein the TAT status report further includes an identifier of the one TAG.
11 . An apparatus for a user equipment (UE), the apparatus comprising:
at least one processor; and
at least one computer memory storing instructions that, when executed by the at least one processor, cause the UE to perform operations comprising:
receiving information related to one or more Timing Advance Groups (TAGs);
receiving, from a network, a Timing Advance Command (TAC) for one of the one or more TAGs;
starting a Time Alignment Timer (TAT) for the one TAG;
based on a remaining time of the TAT for the one TAG being less than a threshold for the one TAG,
transmitting, to the network, a TAT status report including,
a first type indication indicating that the remaining time of the TAT for the one TAG is less than the threshold and a second type indication indicating whether the UE wants to keep the TAT for the one TAG running or not.
12 . A non-transitory computer readable storage medium comprising program instructions that, when executed by at least one processor, cause a user equipment (UE) to perform comprising:
receiving information related to one or more Timing Advance Groups (TAGs);
receiving, from a network a Timing Advance Command (TAC) for one of the one or more TAGS;
starting a Time Alignment Timer (TAT) for the one TAG;
based on a remaining time of the TAT for the one TAG being less than a threshold for the one TAG,
transmitting, to the network, a TAT status report including,
a first type indication indicating that the remaining time of the TAT for the one TAG is less than the threshold and a second type indication indicating whether the UE wants to keep the TAT for the one TAG running or not.