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Wireless Systems Resource allocation in the downlink of cellular multi-hop networks

The growth of high-data rate services on mobile cellular networks necessitates more efficient use of the finite bandwidth/power resources available. Ideally this should be achieved with minimum additional infrastructure since it is expensive both in terms of capital outlay and also network redesign. One such evolutionary path which is currently fuelling a lot of interest is multi-hop. This scheme uses one or more relays to forward transmissions between the base station (BS) and the target user equipment (UE). Given a large enough density of relays, there will always be a more path loss efficient multi-hop route between the BS and target UE than the direct hop one. However, it is not so obvious how this will translate into realizable improvements in cell throughput and coverage. The actual benefits of multi-hop are dependent upon a number of key system choices such as the scheduling algorithm and type of antenna array processing used. This paper considers through simulation how the benefits of multi-hop vary for systems that employ combinations of round robin or equal throughput scheduling with either 2 or 4 element maximal ratio combining. Copyright © 2007 John Wiley & Sons, Ltd.