Energy-efficient IPTV simulcast over fixed WiMAX access systems

In this paper, we study the problem of how to design an energy-efficient simulcast scheme for base stations (BSs) to deliver multiple resolutions of IPTV programs simultaneously in a fixed wireless network. We refer to this problem as the energy-efficient IPTV simulcast (EES) problem. We first provide the problem definition of EES and prove that EES is NP-complete. We then formulate the problem as a mixed integer linear program (MILP) and provide a heuristic approach, named VD-RingCover. We prove that the RingCover algorithm, which is a subroutine of VD-RingCover, can obtain the minimum energy consumption for the single base station case (named EES-SB). Our numerical results show that the MILP can solve the small scale problem properly and that the VD-RingCover achieves good results in both large and small scale problems.