Abstract:

Allocation of OFDMA radio resources to multiple services with different QoS requirements is considered in this paper. First, time sensitive services receive high priority to get necessary resources to meet their time delay requirements, and obtain subcarrier clusters to lower the feedbacks and a little more power on each subcarrier cluster to reduce occupancy of the bandwidth. Secondly, the remaining resources after the first step are adaptively assigned to date services to realize the subcarrier-power-integer bits allocation to maximize throughput of OFDMA systems, with the help of remaining power reallocation. Simulations indicate that, using the proposed scheme, spectrum efficiency can be improved by 50% and drop-rate for the time-insensitive users is almost zero with large SNR.

Key words: OFDMA, radio resource management (RRM), subcarrier-power-integer bits allocation