Scheduling with predictable link reliability for wireless networked control
Scheduling with predictable link reliability for wireless networked control
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DOI：
10.1109/iwqos.2015.7404753
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
Hongwei Zhang;Xiaohui Liu;Chuan Li;Yu Chen;X. Che;F. Lin;L. Wang;G. Yin
中科院分区：
文献类型：
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作者：
Hongwei Zhang;Xiaohui Liu;Chuan Li;Yu Chen;X. Che;F. Lin;L. Wang;G. Yin
可预测的链路可靠性是无线网络控制所必需的，然而同信道干扰仍然是无线链路可靠性不确定性的主要来源。将协议模型的局部性和物理模型的高保真度相结合，物理比-K（k）干扰模型具有实现同信道干扰的分布式、可预测的控制以及因此可预测的链路可靠性的潜力。为了实现的潜在的网络模型，我们设计的协议PRKS，解决的挑战，实例化的网络和环境的不确定性的存在下的网络模型。将PRK模型实例化问题制定为最小方差调节控制问题，特别地，PRKS使用控制理论方法来实例化飞行中的PRK模型。通过基于测试床的测量研究，我们表明，与现有的链路可靠性不可预测并且可靠性满足应用要求的链路的比率可以低至0%的调度协议不同，PRKS能够实现可预测的高链路可靠性（例如，95%）的所有链接在不同的网络和环境条件下，没有这些条件的先验知识。通过本地的分布式协调，PRKS还实现了非常接近于由最先进的集中式调度器实现的信道空间重用，同时确保所需的链路可靠性。通过确保调度中所需的链路可靠性，PRKS还实现了比现有调度协议更低的通信延迟和更高的网络吞吐量。
Predictable link reliability is required for wireless networked control, yet co-channel interference remains a major source of uncertainty in wireless link reliability. Integrating the protocol model's locality and the physical model's high fidelity, the physical-ratio-K (PRK) interference model has the potential to enable distributed, predictable control of co-channel interference and thus predictable link reliability. To realize the potential of the PRK model, we design protocol PRKS that addresses the challenge of instantiating the PRK model in the presence of network and environmental uncertainties. Formulating the PRK-model-instantiation problem as a minimum-variance regulation control problem, in particular, PRKS uses a control-theoretic approach to instantiating the PRK model on the fly. Through testbed-based measurement study, we show that, unlike existing scheduling protocols where link reliability is unpredictable and the ratio of links whose reliability meets application requirements can be as low as 0%, PRKS enables predictably high link reliability (e.g., 95%) for all the links in different network and environmental conditions without a priori knowledge of these conditions. Through local, distributed coordination, PRKS also achieves a channel spatial reuse very close to what is enabled by the state-of-the-art centralized scheduler while ensuring the required link reliability. By ensuring the required link reliability in scheduling, PRKS also enables a lower communication delay and a higher network throughput than existing scheduling protocols.