Efficient initial access system under a multi-carrier combination condition for supporting broadband
The present invention relates to a wireless access system, and more particularly, to an initial system under a multi-carrier combination condition. A method of for performing an initial access in a base station which supports the multi-band of a terminal according to one embodiment of the present invention comprises the steps of: searching one or more downlink component carriers of the base station; receiving system information including a broadcast channel of a first downlink component carrier from among the searched one or more downlink component carriers and information for indicating one or more uplink component carriers connected to the first downlink component carrier; transmitting a first message to the base station through a first uplink component carrier from among one or more uplink component carriers indicated by the received system information; and receiving a second message including uplink authorization information from the base station through the first downlink component carrier.
1. A method for controlling one or more carriers in a multi-carrier aggregation condition in a wireless communication system, the method performed by a mobile terminal and comprising:
transmitting a message for requesting a random access procedure to a base station;
performing a negotiation procedure with the base station in response to the message according to a capability to support symmetric carrier aggregation including an equal number of uplink and downlink component carriers and asymmetric carrier aggregation including an unequal number of uplink and downlink component carriers of the mobile terminal;
receiving carrier assignment information regarding the one or more component carriers assigned to the mobile terminal for communication with the base station through Radio Resource Control (RRC) signaling based on the negotiation,
wherein the carrier assignment information is used to override downlink-uplink linkage information to support the mobile terminal using asymmetric carrier aggregation within a cell although cell carriers are set according to a symmetric carrier aggregation;
receiving carrier control information and time offset information from the base station using L 1 /L 2 control signaling; and
performing deactivation of one component carrier among the assigned one or more component carriers of the symmetric carrier aggregation based on the received carrier control information, after expiration of a period indicated in the time offset information
wherein the carrier assignment information is valid until a start of the performing of the deactivation of the one component carrier;
wherein the downlink-uplink linkage information defines how the downlink component carriers are linked with the uplink component carriers.
2. The method according to claim 1 , wherein the carrier control information is semi-statically transmitted from the base station when a predetermined event triggers.
3. The method according to claim 1 , wherein the carrier control information is transmitted from the base station using a separate channel with a predetermined period.
4. The method according to claim 1 , further comprising;
transmitting feedback information indicating whether an error occurs upon reception of the carrier control information to the base station,
wherein the feedback information is protected by a cyclic redundancy check (CRC).
5. An apparatus for controlling one or more component carriers in a multi-carrier aggregation condition in a wireless communication system, the apparatus comprising:
a radio frequency (RF) unit; and
a processor configured to:
transmit a message for requesting a random access procedure to a base station,
perform a negotiation procedure with the base station in response to the message according to a capability to support symmetric carrier aggregation including an equal number of uplink and downlink component carriers and asymmetric carrier aggregation including an unequal number of uplink and downlink component carriers of the apparatus,
receive carrier assignment information regarding the one or more component carriers assigned to the apparatus for communication with the base station through Radio Resource Control (RRC) signaling based on the negotiation,
wherein the carrier assignment information is used to override downlink-uplink linkage information to support the apparatus using asymmetric carrier aggregation within a cell although cell carriers are set according to a symmetric carrier aggregation,
receive carrier control information and time offset information from the base station using L 1 /L 2 control signaling, and
perform deactivation of one component carrier among the assigned one or more component carriers of the symmetric carrier aggregation based on the received carrier control information, after expiration of a period indicated in the time offset information,
wherein the carrier assignment information is valid until a start of the performing of the deactivation of the one component carrier, and
wherein the downlink-uplink linkage information defines how the downlink component carriers are linked with the uplink component carriers.
6. The apparatus according to claim 5 , wherein the carrier control information is semi-statically transmitted from the base station when a predetermined event triggers.
7. The apparatus according to claim 5 , wherein the carrier control information is transmitted from the base station using a separate channel with a predetermined period.
8. The apparatus according to claim 5 , wherein the processor is configured to transmit feedback information indicating whether an error occurs upon reception of the carrier control information to the base station, and
wherein the feedback information is protected by a cyclic redundancy check (CRC).