8. Voice over LTE (VoLTE)

  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.ch8

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) Voice over LTE (VoLTE), in Radio Protocols for LTE and LTE-Advanced, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/9781118188545.ch8

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



  • circuit-switched fallback (CSFB);
  • IP multimedia subsystem (IMS);
  • Voice over LTE (VoLTE)


In the mobile business, the telephony service has been the major source of revenue for most mobile operators. Even with the proliferation of smartphones, the voice service is still considered important by users. For the success of LTE, it is of crucial importance to maintain support for the voice service over the LTE network. The mobile industry has been motivated by the success of the IP multimedia subsystem (IMS) standard, and the richness and flexibility of the IMS architecture provides a reliable framework to enable fruitful multimedia services including a voice service with guaranteed quality of service. The IMS supports IP multimedia applications including voice, messaging, video, conferencing, and blended multimedia services. circuit-switched fallback (CSFB) enables a voice service by reusing an existing CS network for UEs normally camping on LTE for IP services.

Controlled Vocabulary Terms

IP networks