| 摘要 |
The present invention provides a data discard signaling procedure in a wireless communication system. A Radio Link Control (RLC) provides PDCP in-sequence confirmations. The in-sequence confirmation means that confirmations shall be delivered to PDCP in the same order as PDCP PDUs submitted by PDCP. The sending RLC Acknowledge Mode (AM) entity confirms PDCP Service Data Units (SDUs) with Sequence Numbers (SN) that are positively acknowledged by the peer receiving RLC AM entity. In this way, PDCP PDUs and associated PDCP SDUs with SNs not positively acknowledged will not be deleted by the sending PDCP entity. Another solution provided by the present invention is when the SN for a PDCP SDU carried in a PDCP PDU confirmed by the RLC is larger than the smallest SN for the unconfirmed PDCP SDU, PDCP shall not delete this PDCP PDU and its associated SDU confirmed by RLC until the SN for this PDCP SDU indicated by this confirmation is the smallest or earliest SN. Therefore, the present invention provides a procedure for confirming data transmission which efficiently eliminates problems existing in lossless SRNS Relocation and PDCP Sequence Number synchronization and improves wireless communication system performance.
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