Resource Allocation Schemes for Infrastructure Based Relay Networks

In this paper, three different resource allocation schemes (RASs) are introduced for the FDD downlink of an infrastructure based amplify-and-forward relay network in a multi-cell Manhattan street grid scenario. Firstly, a non-adaptive RAS with predefined and fixed TDMA frame structures for all cells of the network is introduced. Secondly, the non-adaptive RAS is extended by an intra-cell reuse of radio resources. Thirdly, an adaptive RAS is proposed which adapts to changing traffic load distributions in each single cell of the network. It is shown that applying coordination across cells yields in a significant performance gain in terms of cell throughput for both non-adaptive RASs. The adaptive RAS improves the overall performance especially for networks with few high-rate subscriber stations (SSs) and provides more fairness among all SSs. When deactivating coordination across cells, which is an interesting case for practical applications, the adaptive RAS shows the least relative performance degradation among all RASs.