Patent ID: 8547900

Claim:
A mobile communication transmitter comprising: a first SN (Sequence Number) setting module configured to receive data from an upper layer and set a first PDCP (Packet Data Convergence Protocol) SN associated with the data; a header compression module configured to compress a header of the received data; a ciphering module configured to cipher the header-compressed data; a second SN setting module configured to add a second PDCP SN to the ciphered data and transfer the second PDCP SN-added data to a lower layer, a segmentation and concatenation module configured to segment or concatenate the second PDCP SN-added data; and a third SN setting module configured to add a third SN to the segmented or concatenated data, wherein the second PDCP SN is the first PDCP SN which was previously set, and wherein the data received by the first SN setting module from the upper layer is a PDCP SDU (Service Data Unit), and the second PDCP SN-added data transferred by the second SN setting module to the lower layer is a PDCP PDU (Protocol Data Unit).