Patent ID: 9723030
Date: 2017-08-01
CPC Classifications: H04L,H04W

Claim:
1. A method for use in a Mobility Management Entity, an MME, in an LTE system, the method comprising obtaining and determining the capability of a mobile terminal in the LTE system regarding the mobile terminal's capability for Single Radio Voice Channel Continuity, SRVCC, handover from the LTE system to a 2G and/or a 3G system, comparing the mobile terminal's said capability and the LTE system's capability for Single Radio Voice Channel Continuity, SRVCC, handover over from the LTE system to a 2G and/or a 3G system, and, depending on the outcome of the comparison, instructing the mobile terminal to use Voice over LTE, VoLTE, or Circuit Switched, CS, fallback when initiating voice sessions, where the mobile terminal is instructed to use VoLTE if both the mobile terminal and the LTE system are capable of SRVCC handover and the mobile terminal is instructed to use CS fallback otherwise.