METHOD AND APPARATUS FOR MOBILE-TERMINATED SMALL DATA TRANSMISSION MT-SDT
The present disclosure is related to methods and a UE. The UE receives a first message including allocation information of a first configuration uplink grant associated with a first cell and starts a first timer to determine whether the uplink transmission for the first configured uplink grant is aligned. The UE sends a second requesting data transmission in an RRC inactive state where the second message is sent according to the first configured uplink grant or a second random access process. The UE receives a first target signaling to determine the second message is successfully received or a contention resolution for a first random access process is successfully completed. The UE processes at least one of the first timer or a second timer according to a triggering condition of the second message where the second timer is used to determine whether the uplink transmission for the first cell is aligned.
1 . User Equipment (UE) comprising:
processor circuitry; and
a transceiver configured to:
receive a first message comprising at least one of time domain allocation information of a first configuration uplink grant or frequency domain allocation information of the first configuration uplink grant, wherein the first configured uplink grant is associated with a first cell;
the processor circuitry configured to start a first timer, in response to receipt of the first message, wherein the first timer is used to determine whether an uplink transmission for the first configured uplink grant is aligned;
wherein the transceiver is further configured to:
send a second message to request data transmission in an RRC inactive state, wherein the second message is sent according to the first configured uplink grant or is sent in a second random access process; and
receive first target signaling after the second message is sent, wherein the first target signaling is used to determine that the second message is successfully received or that contention resolution for a first random access process is successfully completed; and
wherein the processor circuitry is further configured to: process, in response to the first target signaling, at least one of the first timer or a second timer according to a triggering condition of at least the second message,
wherein the second timer is used to determine whether the uplink transmission for the first cell is aligned.
2 . The UE according to claim 1 , wherein the processor circuitry is further configured to:
consider the first timer is expired if the second message is triggered by an upper layer of an RRC sublayer of the UE, and consider the first timer is not expired if the second message is triggered by a paging message; and
determine to initiate the second random access process based on a status of the first timer.
3 . The UE according to claim 2 , wherein the transceiver is further configured to:
receive second target signaling as a response to the second message being sent, the second target signaling being used to determine that the second message is successfully received, wherein
the second target signaling is received before the first target signaling.
4 . The UE according to claim 2 , wherein the processor circuitry is further configured to: execute a first action set if the second message is triggered by a paging message, wherein the first the first action set includes at least one of: stopping the first timer, starting the second timer, or clearing the first configured uplink grant.
5 . The UE according claim 3 , wherein the processor circuitry is further configured to:
start or restart both the second timer and the first timer if the second message is triggered by an upper layer of the RRC sublayer of the UE; and
start or restart only a former of the second timer and the first timer if the second message is triggered by a paging message, wherein the first target signaling is a MAC CE including at least a timing advance command, and the second message is sent according to the first configured uplink grant.
6 . The UE according to claim 3 , wherein the processor circuitry is further configured to:
stop the second timer, and start or restart the first timer if the second message is triggered by an upper layer of the RRC sublayer of the UE, wherein the first target signaling is used to determine that the contention resolution for the first random access process is successfully completed.
7 . (canceled)
8 . A method performed by a User Equipment (UE) the method, comprising:
receiving a first message comprising at least one of time domain allocation information of a first configuration uplink grant or frequency domain allocation information of the first configuration uplink grant, wherein, the first configured uplink grant is associated with a first cell;
starting a first timer based on the first message, wherein the first timer is used to determine whether an uplink transmission for the first configured uplink grant is aligned;
sending a second message request data transmission in an RRC inactive state, wherein the second message is sent according to the first configured uplink grant or is sent in a second random access process;
receiving first target signaling, wherein the first target signaling is used to determine that the second message is successfully received or that contention resolution for a first random access process is successfully completed; and
processing, in response to the first target signaling, at least one of the first timer or a second timer according to a triggering condition of at least the second message, wherein
the second timer is used to determine whether the uplink transmission for the first cell is aligned.
9 . (canceled)
10 . The UE according to claim 1 , wherein the first target signaling is a media access control-control element (MAC CE) comprising at least a timing advance command.