Cross-Layer Adaptive Resource Management for Wireless Packet Networks With OFDM Signaling

Adaptive resource management has become a key technique for the next-generation wireless systems to provide desired services at appropriate QoS. Most of the current resource management algorithms are confined to a single layer of the network protocol stack, which leads to an inferior performance. In this paper, we propose a joint MAC-PHY layer resource management algorithm for wireless OFDM networks. The algorithm aims to maximize the system power efficiency given that the fulfillment of the QoS as well as the fairness is guaranteed. We formulate the integrated design of packet scheduling, subcarrier allocation, and power control into a constrained optimization problem. The formulation defines the interaction and cooperation between different components of the algorithm as well as the information exchange between the PHY and MAC layers. A reduced-complexity scheme that solves the optimization problem in polynomial time is then developed based on the special structure of the problem. Analytical and numerical results will show that the proposed algorithm is able to guarantee the same degree of QoS and fairness as the fair queueing systems do in wired channels. Meanwhile, the power efficiency and system performance are significantly improved compared to traditional systems where resources are allocated based on a strict layering architecture