A Tutorial on Cross-Layer Optimization in Wireless Networks

Abstract—This tutorial paper overviews recent developments … The rest of the tutorial is organized as follows. Section II …

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A Tutorial on Cross-Layer Optimization in Wireless Networks
Abstract, in optimization based approaches for resource allocation problems in wireless systems. We begin by overviewing important, results in the area of opportunistic (channel-aware) scheduling, for cellular (single-hop) networks, where easily implementable, myopic policies are shown to optimize system performance. We, then describe key lessons learned and the main obstacles in, extending the work to general resource allocation problems for, multi-hop wireless networks. Towards this end, we show that a, clean-slate optimization based approach to the multi-hop resource, allocation problem naturally results in a \”loosely coupled\” crosslayer solution. That is, the algorithms obtained map to different, layers (transport, network, and MAC/PHY) of the protocol, stack are coupled through a limited amount of information, being passed back and forth. It turns out that the optimal, scheduling component at the MAC layer is very complex and, thus needs simpler (potentially imperfect) distributed solutions. We demonstrate how to use imperfect scheduling in the crosslayer framework and describe recently developed distributed, algorithms along these lines. We conclude by describing a set, of open research problems. The Congestion-Control Problem, The Scheduling Problem, The Solution, Remark, Xiaojun Lin

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