Joint prioritized link scheduling and resource allocation for OFDMA-based wireless networks

Abstract

In this paper, we study the joint prioritized link scheduling and resource allocation for the OFDMA-based wireless network which serves two classes of user links, namely non-prioritized (low-priority) and prioritized (high-priority) links. Our design objectives are to maximize the number of non-prioritized links to be scheduled and to maximize the weighted sum rate of all scheduled links while guaranteeing the minimum rate requirements of all prioritized links. To solve this problem, we first transform the original problem into a singlestage optimization problem which is a Mixed Integer Nonlinear Program (MINLP). Then, we propose an iterative algorithm to solve the transformed problem where we sequentially perform modified power allocation and link removals. We prove the convergence and characterize important properties of the proposed algorithm. Numerical results show that the proposed algorithm significantly outperforms the greedy uniform power allocation and the rounding-based admission algorithm in term of the average number of scheduled non-prioritized links and the weighted sum rate.