Playout-Buffer Aware Hand-Off Control for Wireless Video Streaming
Wireless hand-off control typically considers only connectivity strength from the mobile terminal to alternative access points. In wireless video streaming, however, where video freezing must be avoided at the mobile terminal, the play-out buffer level should also be considered by hand-off control. In this paper, the authors first develop a model capturing hand-off dynamics under video streaming, and design a new play-out buffer aware hand-off control. It aims to avert a video freeze for as long as possible, maximizing the expected time until freezing. They compute the optimal control in the general case of multiple access points and multiple connectivity strength states per channel.