Voice Call Continuity - A Novel Mobility Scheme for Voice on Call Control Level

Voice call continuity (VCC) is a novel mobility scheme for voice communication on call control level. One main use case is to transfer a voice session between CS access and WLAN, however, the solution as currently discussed in standardization is not limited to WLAN, but is restricted to make-before-break type of operation for a domain transfer. This paper provides a description of the current capabilities and limitations of the VCC standards. A possible evolution of the VCC solution has been implemented in a prototype, which realized the transfer of a voice session and a video session in parallel between WLAN and WCDMA, whereby on WCDMA a CS bearer is used for the voice session and a PS bearer is used for the video session.