Patent ID: 9253238
Filing Date: 2016-02-02
CPC Classification: H04L,H04W

Claim Text:
1. A method for initiating a codec rate change during a voice over Long Term Evolution (VoLTE) call by a wireless communication device, the method comprising: by the wireless communication device: establishing a first codec rate for use in the VoLTE call during a call establishment phase; using the first codec rate to encode voice data for transmission during a first portion of the VoLTE call; determining a channel quality while using the first codec rate; determining that the channel quality satisfies a threshold for requesting a codec rate change; requesting the codec rate change from the first codec rate to a second codec rate in response to determining that the channel quality satisfies the threshold for requesting the codec rate change; using the second codec rate to encode voice data for transmission during a second portion of the VoLTE call; determining a second channel quality while using the second codec rate; determining that the second channel quality satisfies a threshold for requesting a codec rate change to return to the first codec rate; applying a hysteresis condition before requesting the codec rate change to return to the first codec rate; requesting the codec rate change to return to the first codec rate in an instance in which the hysteresis condition is satisfied; and continuing to use the second codec rate in an instance in which the hysteresis condition is not satisfied.