Method for performing rrc connection or reestablishment in a communication system using carrier aggregation
AssigneeLG Electronics Inc.
InventorsSung Jun Park, Seung June Yi, Sung Duck Chun
Life of this patent
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Abstract
The invention relates to a method for performing a radio resource control (RRC) connection or reestablishment in a communication system using carrier aggregation (CA), and to a terminal device for same. The present invention involves acquiring information on an additional component carrier (CC) through system information in addition to the CC which is specified during cell selection or reselection, and enables the CC on which additional information is acquired to be usable during the RRC connection or reestablishment performed by user equipment, to thereby prevent loads from being concentrated on a specific CC.
Claims14
A method for establishing or reestablishing a Radio Resource Control (RRC) connection to a network at a User Equipment (UE) in a mobile communication system using Carrier Aggregation (CA) in which communication is conducted on a plurality of Component Carriers (CCs), the method comprising:
- performing cell selection or cell reselection;
- selecting a first downlink CC according to a result of the cell selection or cell reselection;
- selecting a first uplink CC linked to the first downlink CC;
- receiving system information on the first downlink CC from the network, the system information including information about a second uplink CC and a second downlink CC;
- selecting one of a first CC set having the first uplink CC and the first downlink CC and a second CC set having the second uplink CC and the second downlink CC;
- and
- establishing or reestablishing an RRC connection to the network using the selected CC set.
A User Equipment (UE) for establishing or reestablishing a Radio Resource Control (RRC) connection to a network in a mobile communication system using Carrier Aggregation (CA) in which communication is conducted on a plurality of Component Carriers (CCs), the UE comprising:
- an RRC layer module for generating a logical channel signal for RRC connection establishment or reestablishment;
- a Medium Access Control (MAC) layer module including a plurality of Hybrid Automatic Repeat reQuest (HARQ) entities one to one corresponding to the plurality of CCs, for mapping the logical channel signal for RRC connection establishment or reestablishment to a transport channel and controlling transmission of the transport channel on one of the plurality of CCs;
- and
- a physical layer module for mapping the transport channel to a physical channel and controlling transmission of the physical channel on the one CC,
- wherein if system information is received from the network on a first downlink CC between a first uplink CC and the first downlink CC selected according to cell selection or cell reselection of the RRC layer module, the system information including information about a second uplink CC and a second downlink CC, the MAC layer module selects one of a first CC set having the first uplink CC and the first downlink CC and a second CC set having the second uplink CC and the second downlink CC, and establishes or reestablishes an RRC connection to the network using the selected CC set.
Dependencies are inferred from the claim text.