5. Radio Link Control (RLC)

  1. SeungJune Yi,
  2. SungDuck Chun,
  3. YoungDae Lee,
  4. SungJun Park and
  5. SungHoon Jung

Published Online: 5 SEP 2012

DOI: 10.1002/9781118188545.ch5

Radio Protocols for LTE and LTE-Advanced

Radio Protocols for LTE and LTE-Advanced

How to Cite

Yi, S., Chun, S., Lee, Y., Park, S. and Jung, S. (2012) Radio Link Control (RLC), in Radio Protocols for LTE and LTE-Advanced, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/9781118188545.ch5

Author Information

  1. LG Electronics, South Korea

Publication History

  1. Published Online: 5 SEP 2012
  2. Published Print: 5 SEP 2012

ISBN Information

Print ISBN: 9781118188538

Online ISBN: 9781118188545



  • acknowledged Mode (AM);
  • automatic repeat request (ARQ) operation;
  • framing;
  • radio link control (RLC);
  • reordering;
  • transparent Mode (TM);
  • unacknowledged mode (UM);
  • window operation


An RLC layer is connected to a lower MAC layer via logical channels. Each logical channel transports different types of traffic, and the name of the logical channel reflects the characteristic of the traffic it transport. RLC functions are performed by an RLC entity. The RLC entity is used for only one radio bearer. However, a bidirectional radio bearer can have two RLC entities, in which case two UM RLC entities with different directions are used for the radio bearer. This chapter gives an overview of the RLC functions such as framing, reordering, automatic repeat request (ARQ) operation, window operation, SDU discard and RLC re-establishment depending on the RLC operating mode. The RLC operating modes are transparent Mode (TM), unacknowledged mode (UM) and acknowledged Mode (AM).

Controlled Vocabulary Terms

automatic repeat request; radio links