Dynamic resource allocation using hybrid Cooperative Relaying and Network Coding in LTE-Advanced network

Cooperative Relaying (CoR) and Network Coding (NC) are two promising techniques for improving the performance of next generation LTE-Advanced networks. In this paper, a dynamic resource allocation scheme is proposed in relay-assisted LTE-Advanced networks under asymmetric traffic condition. In our scheme, a Two-Way Relay Channel (TWRC) is considered with three nodes: User Equipment (UE), Base Station or eNodeB (eNB) and an intermediate Relay Station (RS). In such a network, LTE UEs and eNB can choose between different transmission schemes: direct transmission, pure CoR (CoR scheme) using an intermediate relay station, or via the combination of Network Coding and Cooperative Relaying (NC/CoR scheme). We study the achievable rate regions for direct transmission, CoR and NC/CoR and it is noticed that NC/CoR does not always achieve better performance than CoR or direct transmission. Therefore, a hybrid transmission scheme with adaptive resource allocation is proposed to dynamically choose the best transmission scheme among NC/CoR, pure CoR or direct transmission. The simulation results show that the hybrid algorithm significantly outperforms conventional schemes for both SISO and MIMO systems.