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Efficient multicasting of critical messages is of essential importance in public safety and commercial multimedia cellular networks. The authors study the effectiveness of using relay stations to enhance the spectral efficiency of multicast distribution in a mobile wireless networks. Coloring oriented adaptive rate scheduling algorithms are considered, including such that temporally employ TDMA schedules with reuse levels of 1, 3, 4 and 7 over a cellular arrangement. These schemes are used to regulate multicast transmissions executed by base station and (when employed) relay station nodes. They examine the utility of using in each cell single and double levels of placed relay stations. When the latter are employed, 2-hop and 3-hop relaying paths are considered.
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