A method of transmitting a buffer status report (BSR) of a user equipment includes triggering a procedure for a BSR corresponding to a predefined logical channel; determining whether a resource for transmitting a scheduling request corresponding to the predefined logical channel is allocated; identifying whether a configured uplink resource is allocated, based on a result of determining whether the resource for transmitting the scheduling request is allocated; and when the configured uplink resource is allocated, determining whether to transmit the BSR by using the configured uplink resource.