Patent ID: 8335189

Claim:
A method for ensuring delivery packet data convergence protocol (PDCP) packets in a wireless communication, the method comprising: performing re-establishment of a PDCP entity based on a handover error, wherein performing re-establishment of the PDCP entity comprises resetting a header compression entity and operation state; generating a PDCP-STATUS message based on a PDCP event, the generation of the PDCP-STATUS message based on the PDCP event being configured by radio resource control (RRC) signaling, wherein the PDCP-STATUS message comprises a starting sequence number and a bitmap, the starting sequence number is a sequence number of a PDCP service data unit (SDU) that has not been successfully received, and the bitmap comprises a plurality of bits, each bit representing a status for one PDCP SDU of one or more consecutive PDCP SDUs; sending the PDCP-STATUS message to a peer entity using a PDCP control packet data unit (PDU).