Radio Link Control (RLC)

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

The main services and functions of the RLC sublayer include:

  • Transfer of upper layer PDUs;
  • Error Correction through ARQ (only for AM data transfer);
  • Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer);
  • Re-segmentation of RLC data PDUs (only for AM data transfer);
  • In sequence delivery of upper layer PDUs (only for UM and AM data transfer);
  • Duplicate detection (only for UM and AM data transfer);
  • Protocol error detection and recovery;
  • RLC SDU discard (only for UM and AM data transfer);
  • RLC re-establishment.

Protocol specification

3GPP TS 36.322 - Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link Control (RLC) protocol specification

 

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