Methods of generating data blocks in wireless communication system

A method of generating a data block to be transmitted from a specific layer to a receiving side in a transmission side of a wireless communication system according to the present invention includes the steps of receiving an upper layer data block from an upper layer and varying And generating a lower layer data block including at least a portion of the upper layer data block, information indicating a state of the upper layer data block to be selected. According to the data block generation method, the overhead of the header for the upper layer data block is optimized according to the content of the upper layer data block and the event status, thereby improving the system efficiency. MAC, RLC, PDCP, PDU, SDU