3GPP LTE MAC Layer EventHelix（3 gpp LTE EventHelix MAC层）.pdf

EventH •telecommunication design •systems engineering •real-time and embedded systems 3GPP LTE Packet Data Convergence Protocol (PDCP) Sub Layer © 2009 EventH Inc. All Rights Reserved. EventH LTE PDCP Sub Layer •telecommunication design •systems engineering Functions •real-time and embedded systems • Header compression and decompression Header Ciphering and of IP data flows using the ROHC protocol; compression deciphering of • Transfer of data (user plane or control and user and control plane); decompression plane data • Maintenance of PDCP SNs; with ROHC • In-sequence delivery of upper layer PDUs at re-establishment of lower layers; • Duplicate elimination of lower layer SDUs PDCP at re-establishment of lower layers for radio bearers mapped on RLC AM; • Ciphering and deciphering of user plane Transfer of data Integrity data and control plane data; and PDCP protection and