Patent ID: 11943721
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 7:
8. A terminal supporting carrier aggregation in a wireless communication system, the terminal comprising:
a transceiver; and
a controller configured to:
receive, from abase station via the transceiver, first timing advance (TA) information associated with a primary timing advance group (PTAG) which is a group of serving cells using same timing advance value for an uplink transmission and includes a primary cell,
start or restart a first TAT associated with the PTAG,
receive, from the base station via the transceiver, second TA information associated with a secondary timing advance group (STAG) which is a group of serving cells using same timing advance value and does not include the primary cell,
start or restart a second TAT associated with the STAG based on the second TA information,
receive, via the transceiver, downlink data on at least one serving cell in the STAG,
identify that a TAT is expired,
in case that the expired TAT is the second TAT associated with the STAG,
in case that the expired TAT is the first TAT associated with the PTAG, notify the RRC layer to release at least one PUCCH for all serving cells belonging to the PTAG and the STAG,
identify whether the expired TAT is associated with a TAG which includes a serving cell on which hybrid automatic repeat request (HARQ) feedback is to be transmitted and supporting a PUCCH transmission,
in case that the expired TAT is associated with the TAG including the serving cell, an instruction to generate HARQ positive or negative acknowledgement information for the downlink data is not delivered to a physical layer of the terminal, and
in case that the expired TAT is not associated with the TAG including the serving cell, an instruction to generate the HARQ positive or negative acknowledgement information for the downlink data is delivered to the physical layer.