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US 12,764,680 B2Granted
Apparatus and method for establishing uplink synchronization in a wireless communication system
AssigneePantech Co., Ltd.
InventorsKibum Kwon, Myungcheul Jung
Life of this patent
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Abstract
Uplink synchronization establishment in a base station which operates a plurality of component carriers according to one embodiment of the present description, is performed in that the base station is connected to a user equipment, sets component carrier aggregation information, generates an uplink timing groups in the set component carrier aggregation, and transmits information on the thus-generated uplink timing groups to the user equipment.
Claims6
A communication method for a user equipment (UE) comprising:
- receiving, from a base station, a Radio Resource Control (RRC) message through a primary Component Carrier (CC), wherein the primary CC belongs to a first uplink (UL) timing group, the RRC message comprises information related to a second UL timing group, and the second UL timing group includes a secondary CC;
- receiving, from the base station, information indicating a random access preamble;
- transmitting, to the base station, the random access preamble according to a non-contention selection, through a selected CC among the second UL timing group;
- receiving, from the base station, a random access response through the primary CC, the random access response including a Timing Advanced (TA) value for the second UL timing group in response to the transmitted the random access preamble, together with UL grant information for the UE;
- and
- applying the TA value to the secondary CC belonging to the second UL timing group.
3 more elements
A communication apparatus for a user equipment (UE) comprising:
- a memory;
- and
- a processor operably couped to the memory,
- wherein the processor, when executing program instructions stored in the memory, is configured to cause the apparatus to:
- receive, from a base station, a Radio Resource Control (RRC) message through a primary Component Carrier (CC), wherein the primary CC belongs to a first uplink (UL) timing group, the RRC message comprises information related to a second UL timing group, and the second UL timing group includes a secondary CC;
- receive, from the base station, information indicating a random access preamble;
- transmit, to the base station, the random access preamble according to a non-contention selection, through a selected CC among the second UL timing group;
- receive, from the base station, a random access response through the primary CC, the random access response including a Timing Advanced (TA) value for the second UL timing group in response to the transmitted the random access preamble, together with UL grant information for the UE;
- and
- apply the TA value to the secondary CC belonging to the second UL timing group.
7 more elements
Dependencies are inferred from the claim text.