This paper proposes a new MAC scheduling scheme for efficient support of multimedia services in multiuser OFDM wireless networks, both in the uplink and in the downlink. This scheme is based on a system of weights that dynamically accounts for the experienced QoS and the transmission conditions in an extended higher layers/MAC/PHY cross layer design. This approach solves the crucial issue of wireless multiple access schemes: ensuring fairness without sacrificing the throughput offered by the scarce bandwidth resource. Performance evaluation shows that the proposed scheduling outperforms existing wireless OFDM based scheduling schemes and demonstrates that choosing between high fairness and high system throughput is not required.