Opportunistic Scheduling: An Illustration of Cross Layer Design
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Abstract
The unique characteristics of wireless communication systems - namely, timing-varying channel conditions and multiuser diversity- call for specifically tailored system designs. In this paper, we overview a Cross Layer design method, named opportunistic scheduling, for exploiting the time- varying nature of the radio environment to increase the overall performance of the system under certain QoS/fairness requirements of users. We first discuss a general system model, and the fairness and QoS constraints being considered. Then, we present various optimal index policies and discuss their properties. We also outline a methodology to implement these opportunistic scheduling solutions in practice. Lastly, we discuss the advantages and costs associated with opportunistic scheduling, and identify possible future research directions.
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