Resource Allocation for OFDMA Based Relay Enhanced Cellular Networks

Relay enhanced cellular network is a promising architecture for next generation wireless communication system. Introducing relay nodes into cellular networks challenges the resource allocation. The centralized subcarrier and power allocation algorithm which maximizes system capacity with constraint of overall transmission power is studied for OFDMA based relay enhanced cellular networks. A heuristic algorithm is proposed for subcarrier assignment to exploit multiuser diversity as much as possible. An iterative power allocation algorithm is presented to balance the two-hop links of each relay node based on the predetermined subcarrier assignment solution. Performance of the proposed algorithms is evaluated. Numerical results show that the proposals can achieve significant improvement on system capacity without heavy computational complexity.