Packet Data Convergence Protocol (PDCP)

PDCP protocol layer exists in UE & eNodeb, It is part of LTE air interface control and user planes.

The main services and functions of the PDCP sublayer for the user plane include:

  • Header compression and decompression: ROHC only;
  • Transfer of user data;
  • In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM;
  • Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM;
  • Retransmission of PDCP SDUs at handover for RLC AM;
  • Ciphering and deciphering;
  • Timer-based SDU discard in uplink.

The main services and functions of the PDCP for the control plane include:

  • Ciphering and Integrity Protection;
  • Transfer of control plane data.

Protocol specification

3GPP TS 36.323 - Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) specification

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