Abstract
Relay selection is a key issue in multi-hop relay networks. In this thesis, a new cross-layer relay selection scheme for two-hop relay networks is proposed, which utilizes a novel utility function as the relay selection criterion. The proposed selection scheme which considers both channel state information (CSI) at physical layer and queue state information (QSI) at data link layer, aims to guarantee the diverse QoS requirements for different services. The queue state information is used to evaluate the impact of relay selection on change of transmitting rate of different services. Moreover, different levels of priority is assigned to each service to represent the different QoS stringency of each service. Our simulation results show that the proposed algorithm outperforms other relay selection schemes in terms of satisfying frame-level and slot-level QoS satisfaction.