Patent ID: 8654795

Claim:
A packet data transmitting method for packet service domain, comprising: a Packet Data Convergence Protocol (PDCP) entity determining whether a Serial Number (SN) window is full after receiving a Service Data Unit (SDU); when the Serial Number (SN) window is full: the PDCP entity adding the SDU in a cache queue; the PDCP entity deleting a Protocol Data Unit (PDU) record from the SN window, wherein the deleted PDU record has a weight value exceeding a threshold value, when the cache queue is full; and the PDCP entity processing a first SDU in the cache queue into a PDU, transmitting the PDU to a Radio Link Control (RLC) layer entity, and adding a PDU record of the transmitted PDU into the SN window, wherein each PDU record in the SN window has the weight value for indicating a length of time of the PDU record in the SN window; and when the SN window is not full and there is at least one SDU is in the cache queue: the PDCP entity processing a first SDU in the cache queue into a PDU, transmitting the PDU to the RLC layer entity, and adding a PDU record of the transmitted PDU into the SN window.