Resource allocation for heterogeneous services in OFDMA systems with base station cooperation

Base Station Cooperation (BSC) is considered as a promising way for Co-Channel Interference (CCI) mitigation and system capacity improvement in multicell OFDMA systems. How to allocate radio resource optimally to guarantee the quality of services is a key problem in OFDMA systems with BSC. Previous research mostly focuses on the case of homogenous service. This paper studies subcarrier and power allocation problem in such a system where users with Best Effort (BE) service and those with Rate-Constrained (RC) service coexist. A two-stage heuristic algorithm is proposed. In the first stage, the algorithm allocates resource to only RC users, trying to minimize the number of subcarriers needed to satisfy their rate requirements with the help of value matrix of subcarriers. In the second stage, the remaining subcarriers are assigned optimally to BE users to maximize their sum rate. Simulation results show that the proposed algorithm outperforms the counterparts in both system outage probability and BE users' sum rate.