In resource limited mobile computing devices (wireless sensor networks), energy saving is a critical design task. However, existing wake-up mechanisms encounter a critical trade-off between energy consumption and response time.In this paper, we propose a passive RF wake up (PRFW) scheme instead of time-based scheme to wake up node that indeed needs to wake up. The PRFW scheme is enabled by a PRFW hardware module sensing radio signal from other nodes. Analysis of energy consumption and delay shows that the power saving capability and wake-up delay can be improved by using the PRFW scheme.
Aiming to alleviate the drawbacks of the existing power-aware routing algorithms caused by the hotspot problem and Near-Far problem, this paper propose an improved uneven clustering routing algorithm , named as Multilayer Cluster Routing based on Cooperative Relaying (MCRCR). This new algorithm protocol introduces the super-cluster-head node and the relay node conceptions to avoid the hotspots and balance the node energy consumption. After a series of mathematical calculations, the energy consumption for each type of sensor node is provided. Based on MATLAB simulation results, a conclusion can be shown that the MCRCR algorithm is significantly effective in extending the operation lifetime of homogenous WSNs.
With the substantial increase of vehicles on road, driving safety and transportation efficiency have become increasingly concerned focus from drivers, passengers, and governments. Wireless networks constructed by vehicles and infrastructures provide abundant information to share for the sake of both enhanced safety and network efficiency. This paper presents the systematic research to enhance the vehicle safety by wireless communication, in the aspects of information acquisition through vehicle sensing, vehicleto-vehicle (V2V) routing protocol for the highly dynamic vehicle network, vehicle-to-infrastructure (V2I) routing protocol for a tradeoff in real-time performance and load balance, and hardware implementation of V2V system with on-road test. Simulations and experimental result validate the feasibility of the algorithms and communication system.
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