Patent ID: 8614948

Claim:
A data transmission method comprising: determining whether a plurality of Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) are consecutive; mapping the plurality of PDCP PDUs to one Radio Link Control (RLC) PDU when the plurality of PDCP PDUs are consecutive, wherein a PDCP Serial Number (SN) of a first PDCP PDU among the plurality of PDCP PDUs is reserved, while PDCP SNs of the remaining PDCP PDUs are removed; setting a flag bit in a RLC PDU's header as a first preset value to indicate that the plurality of PDCP PDUs are consecutive; mapping the plurality of PDCP PDUs to one RLC PDU when the plurality of PDCP PDUs are non-consecutive, wherein PDCP SNs of the plurality of PDCP PDUs are reserved; and setting the flag bit in the RLC PDU's header as a second present value to indicate that the plurality of PDCP PDUs are non-consecutive, wherein, if a last part of one PDCP PDU is mapped to the RLC PDU, a PDCP SN of a PDCP PDU following the one PDCP PDU is reserved in the RLC SDU, while PDCP SNs of the subsequent PDCP PDUs are removed.