Ricerc@Sapienza

This paper investigates the benefits of flexible
resource allocation when performing HTTP-based Adaptive
Streaming (HAS) across cellular systems such as Long Term
Evolution (LTE). To guarantee video fluidity in the presence of
fluctuations of the instantaneous video source rate and channel
capacity, we consider a HAS based proxy video manager and
resource controller located at the cellular base station. Based
on the channel quality observed by mobile clients, the manager
allocates the wireless bandwidth to mobile clients for transmitting
the video streams. We propose a cross-layer bandwidth allocation
scheme that takes into account the channel quality as well as
the video quality requirements and encoding rate fluctuations of
the HAS video stream and minimizes the transmission delays
experienced by users. This cross-layer bandwidth allocation
achieves the optimum in terms of HAS streams delays and
it outperforms different bandwidth allocations procedures and
state-of-the-art LTE schedulers.