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From a theoretical standpoint, backpressure-based techniques present elegant cross-layer rate control solutions that use only local queue information. It is only recently that attempts are being made to design real world wireless protocols using these techniques. To aid this effort, the authors undertake a comprehensive experimental evaluation of backpressure mechanisms for multi-hop wireless networks, in particular the first such study in the context of wireless sensor networks. Their evaluation yields two key insights into the design of such protocols.
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