Triggercast：实现建设性的无线碰撞
Triggercast: Enabling Wireless Collisions Constructive
摘要：
一般认为，在无线传感器网络中，为了减少冲突，应该避免并发传输。相长干扰（CI）设想并发传输在接收器处正干扰。CI潜在地允许能量消耗的数量级减少和链路质量的改善。本文首次从理论上引入了利用IEEE 802.15.4无线电构造CI的充分条件。此外，我们提出了Triggercast，一个分布式中间件，并表明它是可行的，在TMote天空传感器节点产生CI。为了在芯片级同步多个数据包的传输，Triggercast有效地补偿了传播和无线电处理延迟，并且具有至多250 ns的$95^{th}$百分位同步误差。Triggercast还智能地决定哪些协作节点参与同时传输，并且在最大系统鲁棒性的条件下调整它们的传输时间以最大化整体链路PRR。在真实的测试平台上进行的大量实验表明，Triggercast在7个并发重复的情况下将PRR从5%显著提高到70%。我们还表明，Triggercast提供平均$1.3\times$ PRR性能增益，与现有的数据转发协议集成时。
英文摘要：
It is generally considered that concurrent transmissions should be avoided in order to reduce collisions in wireless sensor networks. Constructive interference (CI) envisions concurrent transmissions to positively interfere at the receiver. CI potentially allows orders of magnitude reductions in energy consumptions and improvements on link quality. In this paper, we theoretically introduce a sufficient condition to construct CI with IEEE 802.15.4 radio for the first time. Moreover, we propose Triggercast, a distributed middleware, and show it is feasible to generate CI in TMote Sky sensor nodes. To synchronize transmissions of multiple senders at the chip level, Triggercast effectively compensates propagation and radio processing delays, and has $95^{th}$ percentile synchronization errors of at most 250ns. Triggercast also intelligently decides which co-senders to participate in simultaneous transmissions, and aligns their transmission time to maximize the overall link PRR, under the condition of maximal system robustness. Extensive experiments in real testbeds reveal that Triggercast significantly improves PRR from 5% to 70% with 7 concurrent senders. We also demonstrate that Triggercast provides on average $1.3\times$ PRR performance gains, when integrated with existing data forwarding protocols.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
