13. Relay

  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.ch13

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) Relay, in Radio Protocols for LTE and LTE-Advanced, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/9781118188545.ch13

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



  • coverage extension;
  • dead spot mitigation;
  • eNB;
  • LTE Release 10;
  • relay node (RN);
  • throughput enhancement;
  • UE


Relay is the technology that relays radio transmissions between the eNB and the UE in a wireless manner. It is regarded as one of the key technologies introduced in LTE Release 10, and is realized by an additional network node called the Relay Node (RN) located between the eNB and the UE. The identified scenarios for the relay technology are coverage extension, dead spot mitigation, throughput enhancement, temporary coverage and group mobility. This chapter presents architecture of the RN. The RN can be classified into layer 1 RN, layer 2 RN and layer 3 RN. Among the three RN types, the layer 3 RN has standard impact, backward compatibility and extensibility. The RN supports most of the Uu functions as a UE or an eNB. The RN Start-Up procedure is used to configure the RN with the necessary parameters to make it ready to start RN operation.

Controlled Vocabulary Terms

long term evolution; radio transmitters; relays; throughput