Investigation of Cooperative Relay Node Selection in Heterogeneous Wireless Communication Systems

In order to fulfill the interworking functionalities between the heterogeneous wireless access networks, a heterogeneous cooperative relay node based convergence structure for the interworking is presented. A utility-based performance optimization model for the cooperative heterogeneous wireless communication systems is proposed to analyze the cooperative diversity gain, in which the optimal theoretical performance model for the cooperative relay node selection strategy is deduced. Based on the proposed theoretical models and considering the computation complexity, the sub-optimal cooperative relay node selection algorithm is determined to pursue the maximum spectrum efficiency from the global viewpoint of heterogeneous wireless communication systems under the conditions of guaranteeing the equivalent transmission rates between the first and second hops. The simulation results demonstrate that the proposed cooperative relay node selection algorithm can improve performances by achieving the cooperative gain.