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IPTV multi-casting is an important service for residential users. In this paper, the authors explore how to allocate resources to different layer-encoded IPTV programs using multi-cast services in relay-assisted centralized wireless access networks. They consider the scenario of two-hop relay stations, and the MAC protocol is OFDMA-based, as in IEEE 802.16m or Long Term Evolution-Advanced (LTE-A). They formulate this problem via an Integer Linear Programming model and propose a heuristic algorithm called Maximum Utility resource allocation for Relayed Multi-cast Services (MU-RMS) to solve this problem. The simulation results show that their algorithm performs efficiently. They also show that their performance is affected by how the forwarding strategy is performed.
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