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1. (WO2018127842) LOSSLESS PACKET DATA CONVERGENCE PROTOCOL SEQUENCE NUMBER CHANGE

Pub. No.:    WO/2018/127842    International Application No.:    PCT/IB2018/050088
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Sat Jan 06 00:59:59 CET 2018
IPC: H04W 36/00
H04W 36/14
H04W 80/02
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: PRADAS, Jose Luis
WITTBERG, Mikael
Title: LOSSLESS PACKET DATA CONVERGENCE PROTOCOL SEQUENCE NUMBER CHANGE
Abstract:
According to some embodiments, a method for use in a Packet Data Convergence Protocol (PDCP) transmitting entity comprises: performing handover from a first cell to a second cell where a PDCP sequence number (SN) for the second cell is smaller than the first cell; resetting PDCP state variables; for all PDCP protocol data units (PDUs) for which the PDCP transmitter has not received receipt confirmation from a PDCP receiver (unconfirmed PDCP PDUs), generating new PDCP PDUs by applying new PDCP headers based on the reset PDCP state variables to the payload of the unconfirmed PDCP PDUs; and transmitting the new PDCP PDUs. Some embodiments include methods for use in a PDCP receiving entity comprising: submitting to a higher protocol layer all PDCP PDUs that were received before handover but not yet submitted to the higher protocol layer; and resetting PDCP state variables.