Patent ID: 9655019
Date: 2017-05-16
CPC Classifications: H04W

Claim:
1. A method for switching a call by a User Equipment (UE) supporting a Voice Call Continuity (VCC) scheme in a mobile communication system, the method comprising: detecting, using a Dual Radio Voice Call Continuity (DRVCC) controller of the UE, that there is a need for switching a voice call from a first access network to a second access network that is different from the first access network while the UE supporting the VCC scheme transmits and receives data in the first access network through an old bearer which is set up with another party UE; performing a new bearer set up operation with the second access network; and transmitting and receiving voice data with the other party UE through the old bearer in the first access network and transmitting and receiving voice data with the other party UE through the new bearer in the second access network until a point in time, wherein the voice data is transmitted and received between the UE and the other party UE on the first access network and the second access network until the point in time, and wherein the UE selects from among the voice data received from the first access network and the voice data received from the second access network based upon one or more criteria.