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Multi-hop relay wireless network is an attractive solution to B3G and 4G systems, which will suffer from smaller than expected coverage and excessive amount of shadowed areas due to the high operating frequencies. Relay networks enhance the coverage as well as the signal quality by utilizing Relay Stations (RSs) on behalf of Base Station (BS) to provide radio coverage in areas that out of range or shadowed. In such networks, the relaying of duplicated user data between BS and RSs leads to serious capacity degradation, therefore, an efficient scheduling strategy is necessary. The simplest scheduling scheme is to allocate each RS with an Equal Time Share (ETS) of the time frame.
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