A New Double Parameters Controlled Cross-Layer Adaptive Resource Allocation Scheme in Multiuser OFDM System

In this paper, we propose a new double parameters controlled cross-layer adaptive resource allocation scheme for heterogeneous types of traffic in multiuser OFDM system. Unlike the existing resource allocation scheme, the proposed double parameters controlled scheme don\´t focus on the design of packet utility function (PUF), but by controlling values of two parameters: "delay compensatory factor" and "throughput compensatory factor" respectively, to achieve diverse levels of tradeoff between traffic QoS satisfaction and system power efficiency flexibly. The existing PUFs may be applied in the proposed scheme, where double parameters controlled scheduling is followed by subcarrier-power allocation, considering not only queue state, random packet arrival and delay in the MAC layer but also transmit power limit and time varying wireless channel in the PHY layer. In addition, PUFs tailored for a specific type of traffic may be suit to systems with other types of traffic as well as with heterogeneous types of traffic. Fairness among different types of traffic can be guaranteed as well. Simulations confirm the flexibility and efficiency by the proposed scheme.