PDCP packet transmission method

摘要

Disclosed is a PDCP packet transmission method, which improves the transmission performance of UE and eNB by suggesting a method for preventing data loss at the application end, caused by an invalid deciphering result which is generated when 2048 or more PDCP SDUs with sequence numbers assigned thereto are discarded, and a wireless transmission/reception unit (WTRU) including a PDCP entity. The method for transmitting PDCP packet, includes the steps of: receiving a PDCP SDU from an upper layer; determining whether or not sequence numbers are assigned to less than a predetermined number of PDCP SDUs subsequent to the last PDCP PDU completely and successfully transmitted from a lower layer; and if sequence numbers are assigned to less than the predetermined number of PDCP SDUs, assigning a sequence number to the PDCP SDU received from the upper layer.

主权项

1. A method for transmitting a Packet Data Convergence Protocol (PDCP) packet, the method comprising:
receiving a PDCP Service Data Unit (SDU) from an upper layer; determining whether a Next-PDCP_TX_SN minus a sequence number of a last PDCP SDU completely and successfully transmitted from a lower layer is greater than a predetermined number that is determined based on half a PDCP sequence number space; associating a PDCP sequence number that corresponds to the Next-PDCP_TX_SN with the received PDCP SDU if the Next-PDCP_TX_SN minus the sequence number of the last PDCP_SDU completely and successfully transmitted from the lower layer is determined as greater than the predetermined number; and setting the Next-PDCP_TX_SN to a new value and associating a PDCP sequence number that corresponds to the new value with the received PDCP SDU if the Next-PDCP_TX_SN minus the sequence number of the last PDCP SDU completely and successfully transmitted from the lower layer is determined as not greater than the predetermined number.