A Framework and Evaluation of Rate Adaptive Video Telephony in 4G LTE

Abstract:
4G LTE mobile networks are deployed by many operators and first operators offer telephony services over LTE (VoL-TE) today. Video telephony is expected to be the next step. The required media bitrate for video is many times higher than for audio, which increases the risk of network congestion. Video bitrate adaptation techniques can avoid congestion. The Google Congestion Control (GCC) algorithm and the Sprout algorithm are two recently proposed adaptation techniques. Based on the analysis of GCC and Sprout this paper proposes an improved algorithm called E-Sprout, and presents results from LTE system level simulations for video telephony using best effort bearers for the three algorithms.