Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
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Mobile communications has witnessed an exponential increase in the amount of users, services and applications. While 2G cellular networks were mainly optimized to support voice services, effective delivery of broadband multimedia applications will drive the requirements for Next Generation Networks (NGNs). WiMAX targets to provide broadband connectivity to wide area coverage, and thus introduces significant design challenges in the MAC (Medium access Control) to provide the seamless transport of heterogeneous traffic in a cost-effective manner. This paper proposes a Dynamic Resource Allocation (DRA) strategy that can provide operators the flexibility to deliver broadband traffic with high spectral efficiency. The DRA unit constitutes a scheduler, Link Adaptation (LA), Resources Allocation (RA) and Hybrid Automated Repeat Request (HARQ) components inter-working seamlessly. The potential for the DRA to deliver QoS is achieved through service classification lists, where higher priority is given towards retransmitted packets, and subsequently to first-time transmitters with packet delay. The simulation results show that the proposed DRA scheme has the capacity to provide enhanced coverage for NRTV (Near Real Time Video) services in wide area networks (WANs)