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首页> 外文期刊>Parallel and Distributed Systems, IEEE Transactions on >Opportunistic Concurrency: A MAC Protocol for Wireless Sensor Networks
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Opportunistic Concurrency: A MAC Protocol for Wireless Sensor Networks

机译：机会并发：无线传感器网络的MAC协议

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摘要

How to shorten the time for channel waiting is critical to avoid network contention. Traditional MAC protocols with CSMA often assume that a transmission must be deferred if the channel is busy, so they focus more on the optimization of serial transmission performance. Recent advances in physical layer, however, allows a receiver to reengage onto a stronger incoming signal from an ongoing transmission or interference, and thus shows the potential of parallel transmissions. Indeed, even if the channel is busy, a node has opportunities to carry out a successful transmission. In this study, we propose opportunistic concurrency (OPC), a new MAC layer scheme, which enables sensor nodes to capture the opportunistic concurrency and carry out parallel transmissions instead of always waiting for a clear channel. Based on local concurrency map, which encodes the interactions among different links, OPC utilizes concurrency control algorithm to make transmission decision distributedly. Our experiments on a testbed consisting of 60 TelosB sensor motes identify the transmission opportunities in WSNs with OPC. Evaluation results show that OPC achieves a 17 percent reduction in packet latency, a 9.4 percent addition in throughput and a 10 percent reduction in power consumption compared with existing approaches.
机译：如何缩短信道等待时间对于避免网络争用至关重要。具有CSMA的传统MAC协议通常假定如果信道繁忙则必须推迟传输，因此它们将更多精力放在串行传输性能的优化上。但是，物理层的最新进展允许接收器从正在进行的传输或干扰中重新接合到更强的输入信号上，从而显示出并行传输的潜力。实际上，即使信道繁忙，节点也有机会执行成功的传输。在这项研究中，我们提出了机会并发（OPC），一种新的MAC层方案，它使传感器节点能够捕获机会并发并进行并行传输，而不必总是等待明确的信道。 OPC基于本地并发映射，该映射对不同链路之间的交互进行编码，OPC利用并发控制算法来分布式地做出传输决策。我们在由60个TelosB传感器微粒组成的测试床上进行的实验确定了OPC在WSN中的传输机会。评估结果表明，与现有方法相比，OPC的数据包延迟减少了17％，吞吐量增加了9.4％，功耗降低了10％。

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