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A low duty-cycle operation medium access control (MAC) protocol is very important to conserve energy for resource-constrained wireless sensor networks. Traditional sleep-wake scheduling mechanisms of MAC protocols either require periodic synchronization beacons or bring high end-to-end delivery latency due to the lack of any synchronization. In this paper, we propose a low latency MAC protocol by...
The reliable transmission problem in Wireless Sensor Networks (WSNs) is quite different from that in traditional networks. Especially in event-driven wireless sensor networks, the most critical goal is to transmit the event alarm to users reliably and timely. For most current protocols, the raw event packets are periodically sent to the destination. However, the occurrence of the emergency event is...
In monitoring wireless sensor networks (WSNs), the occurrence of an emergency will generate a large amount of data in a very short time. Among them, some urgent information is more critical and needs to be transmitted out reliably as soon as possible. In this scenario, congestion is inevitable due to the limited resources, especially near the sink. To address this problem, we propose a novel reliable...
In monitoring wireless sensor networks (WSNs) with event-driven applications, the generated traffic usually has bursty characteristics when an event occurs. Transient congestion in the networks would increase delay and packet loss rate severely, reducing the network performance greatly. Through the analysis on delay and packet loss rate in congestion, this paper proposes a congestion-aware mac protocol...
The state of the art rate control algorithms for wireless multi-hop networks respond to feedback regarding available capacity in the bandwidth constrained networks. However, the accurate estimation of link capacity is challenging in wireless channel since the interference reduces the link capacity obviously. In, a receiver capacity model is proposed, which associates capacities with nodes instead...
Target tracking, which has been applied popularly in military and civil aspects, is one of the important applications in wireless sensor network. In this paper, we propose a new kind of target tracking system based on camera sensor networks considering the tracking accuracy as the key performance metric. The designed tracking system is composed of four basic components: Object Detection, Neighbor...
Power control technology in wireless sensor network (WSN) is of great significance to ensure the network coverage, reduce the power consumption of the nodes, and optimize network performance. In this paper, a new power control based on routing protocol (PCBRP) in the MAC layer is proposed. It operates with the help of routing protocol and calculates optimal transmission power according to the distance...
In wireless sensor networks (WSNs), some unavailable areas often formes because some sensor nodes become unavailable due to energy exhausted, congestion, or disaster. In this paper, we propose a new micro sensor multi-path routing protocol (MSMRP) to cross around the unavailable areas when building up the routes. And we design a neighbor node table exchanging mechanism that can avoid the multiple...
In most of existing routing protocols of wireless sensor networks (WSNs), a route is set up through broadcasting the route request (RREQ) messages throughout the entire network, which often brings broadcast storm. In this paper, we propose a new gradient-based micro sensor routing protocol (GMSRP) to alleviate the broadcast storm. With the GMSRP, during the network initialization, the sink node broadcasts...
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