Disclosed is a transmission of a RLC STATUS PDU using a limited radio resource by MAC and RLC layers in a long term evolution (LTE) system. In case where the MAC entity prioritizes logical channels for allocating the radio resource to each logical channel, the MAC entity is allowed to allocate radio resources based upon the size of a RLC STATUS PDU to be sent from the RLC layer and also the RLC layer is allowed to use the STATUS PDU prior to RLC data PDUs upon using the allocated radio resource, such that RLC protocols can be avoided from coming in a deadlock situation due to a non-transmission of the STATUS PDU.