Patent ID: 8170060

Claim:
A method of discarding data blocks performed by a transmitter in a wireless communication system, the transmitter implementing a radio interface protocol which comprises a radio resource control (RRC) layer, a radio link control (RLC), layer and a packet data convergence protocol (PDCP) layer, the method comprising: configuring, at the RRC layer, a radio bearer for providing a service; receiving, at the RLC layer, an index, the index indicating a type of a data block related to the service; configuring, at the RRC layer, a discard condition for the data block according to the type indicated by the index, wherein the discard condition is differently configured for each type of data block; transmitting, at the RLC layer, the data block to a receiver; determining, at the RLC layer, whether the discard condition for the data block is satisfied if the data block is not successfully transmitted; and retransmitting, at the RLC layer, the data block to the receiver if the discard condition is not satisfied, or discarding, at the RLC layer, the data block if the discard condition for the data block is satisfied.