Decentralized Resource Allocation Based on Multihop Equilibrium for OFDM-Relay Networks

This paper investigates joint power and subcarrier allocation issues for cellular OFDM-relay networks. Two novel decentralized schemes, namely semi-distributed method and distributed method based on multihop equilibrium are proposed, which aims to exploit the radio resource management (RRM) function for relay nodes (RNs) and decrease the amount of feedback information for RN-MS links. In decentralized mechanism, the base station (BS) distributes resources to direct users and RNs roughly first with partial CSI feedback or without CSI feedback for RN-MS link, and then the RNs allocate resources for each relay user by striking an efficient balance for the multihop transmission. Simulation results show that the proposed decentralized methods can achieve good performances in terms of average throughput and fraction of satisfied users, especially for relay users with multihop equilibrium mechanism. Moreover, the semi-distributed method is better choice for future LTE-A system due to excellent tradeoff between performance and complexity.