{"id":191841,"date":"2015-02-03T00:00:00","date_gmt":"2015-02-03T05:14:44","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/predictable-and-dependable-low-power-wireless-networks\/"},"modified":"2016-07-15T15:21:51","modified_gmt":"2016-07-15T22:21:51","slug":"predictable-and-dependable-low-power-wireless-networks","status":"publish","type":"msr-video","link":"https:\/\/www.microsoft.com\/en-us\/research\/video\/predictable-and-dependable-low-power-wireless-networks\/","title":{"rendered":"Predictable and Dependable Low-power Wireless Networks"},"content":{"rendered":"<div class=\"asset-content\">\n<p>By integrating components for sensing, communicating, computing, and actuating, Cyber-Physical Systems (CPSs) enable applications to monitor and control physical processes. The use of wireless, battery-powered devices unlocks tangible benefits in these emerging CPS settings. However, wireless communications is notoriously unreliable, and small form factors and battery-powered operation impose constraints on the computation and communication capabilities. These issues present severe threats to CPSs, whose safety-critical nature calls for two key features from the networking substrate: (1) predictability at design time, to analyze the behavior of the system before it is deployed, and (2) dependability at run-time, to ensure the correct functioning of the system despite failures. So, in this talk, I will pose the following question: Is it possible to provide predictable and dependable end-to-end communication guarantees on top of unreliable multi-hop low-power wireless networks?<\/p>\n<p>I will explain why it is impractical to address this question using conventional low-power wireless stacks, and describe our work on designing and building a clean-slate communication architecture from the ground up to overcome this problem. In particular, the proposed architecture provides real-time and virtual-synchrony guarantees on the end-to-end delivery of messages &#8211; features that were previously deemed impossible to achieve in these networks. Real-time communication is crucial for the correctness of many CPSs, and virtual synchrony enables the design of fault-tolerant CPSs using state machine replication. Moreover, the architecture allows for predicting the network\u2019s end-to-end performance using simple models with unprecedented accuracy, which can greatly aid in the design and verification of CPSs.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>By integrating components for sensing, communicating, computing, and actuating, Cyber-Physical Systems (CPSs) enable applications to monitor and control physical processes. The use of wireless, battery-powered devices unlocks tangible benefits in these emerging CPS settings. However, wireless communications is notoriously unreliable, and small form factors and battery-powered operation impose constraints on the computation and communication capabilities. 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