Method of allocating radio resources in multi-carrier system

A method of providing buffer status information by a user equipment in a mobile communication system communicating via a plurality of orthogonal subcarriers, the method comprising:ntransmitting a signal of one bit information to a base station via a specific dedicated physical uplink channel while the user equipment is uplink time aligned and when the buffer status information needs to be transmitted, wherein the signal is used for informing a presence of a request for uplink shared channel resources;receiving first resource allocation information for an uplink shared channel from the base station after transmitting the signal; andtransmitting the buffer status information to the base station through the uplink shared channel using the first resource allocation information.

A method of obtaining buffer status information by a base station in a mobile communication system communicating via a plurality of orthogonal subcarriers, the method comprising:nreceiving a signal of one bit information from a user equipment via a specific dedicated physical uplink channel while the user equipment is uplink time aligned, wherein the signal is used for informing a presence of a request for uplink shared channel resources;transmitting first resource allocation information for an uplink shared channel to the user equipment after receiving the signal; andreceiving the buffer status information from the user equipment through the uplink shared channel using the first resource allocation information.

A user equipment in a wireless communication system, the user equipment comprising:na transmitter/receiver configured to transmit or receive a signal to or from a base station using a plurality of orthogonal subcarriers; anda processor connected to the transmitter/receiver and configured to control the transmitter/receiver for providing buffer status information comprises:ntransmitting a signal of one bit information to the base station via a specific dedicated physical uplink channel while the user equipment is uplink time aligned and when the buffer status information needs to be transmitted, wherein the signal is used for informing a presence of a request for uplink shared channel resources;receiving first resource allocation information for an uplink shared channel from the base station after the transmission of the signal; andtransmitting the buffer status information to the base station through the uplink shared channel using the first resource allocation information.

A base station in a wireless communication system, the base station comprising:na transmitter/receiver configured to transmit or receive a signal to or from a user equipment using a plurality of orthogonal subcarriers; anda processor connected to the transmitter/receiver and configured to control the transmitter/receiver for obtaining buffer status information, wherein obtaining the buffer status information comprises:nreceiving a signal of one bit information from the user equipment via a specific dedicated physical uplink channel while the user equipment is uplink time aligned, wherein the signal is used for informing a presence of a request for uplink shared channel resources;transmitting first resource allocation information for an uplink shared channel to the user equipment after receiving the signal; andreceiving buffer status information from the user equipment through the uplink shared channel using the first resource allocation information.