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As more and more real Wireless Sensor Network's (WSN) applications have been tested and deployed over the last decade, the research community of WSN realizes that several issues need to be revisited from practical angles, such as reliability and availability. Furthermore, fault-tolerance is one of the main issues in WSNs since it becomes critical in real deployed environments where network stability...
The following topics are dealt with: mobility management; ad hoc networks; routing protocol; resource allocation; cooperative relay MIMO systems; adjacent channel interference cancellation; MANETs; LDPC codes; frequency selective fading channels; mobile services; mobile telemedicine; TCP; public key; time frequency division multiplex; RF front-ends design; asynchronous DS-CDMA; indoor tracking algorithm;...
Throughput and energy efficiency are two important parameters to evaluate the performance of a wireless sensor network (WSN). For WSNs involved in varying channel conditions packet transmission reliability can be affected. This results in increased number of retransmissions and therefore energy consumption, with low throughput. Making optimal choices for robust packet transmission in this scenario...
To overcome the inherent lossy property of wireless links and increase network throughput, many multi-path routing protocols have been proposed to improve the reliability and latency of packet delivery in wireless networks. Multi-path routing protocols, however, do not take advantage of existing coding opportunities to maximize network throughput. In this paper, we propose a novel coding-aware multi-path...
Multipath routing provides more advantages for mobile ad hoc networks. We address the issue of enhancing route survivability and fault tolerance for packet reliable transmission, and propose the k-redundant multipath model which constructs multiple disjoint primary routes from the source to the destination and meanwhile provides the route redundancy among primary routes. We present the k-RMR protocol...
In recent years, various routing protocols have been proposed for ad hoc networks. Most of these protocols are based upon simulation and security. These protocols still lack in terms of performance efficiency of routing protocols such as avoidance of route breaking, sensing of breakage in route, security and reliability (basically authentication of mobile hops in the real ad hoc networks. i.e. during...
Wireless network coding has been shown to reduce the number of transmissions by exploiting the broadcast nature of the wireless medium. Multiple packets may be encoded into a single packet when their respective next hops have enough information to decode them. Previous research has shown that packets belonging to different flows may be encoded (interflow coding) when they are passing through a common...
In high speed IP networks, interior gateway protocols, like OSPF, cannot obtain a new route to bypass a failure in time. These protocols' convergence period can vary from hundreds of milliseconds to tens of seconds. During this time there is instability, causing high packet loss rates. This study proposes a proactive approach of fast recovery paths to aid OSPF bypass failures. An evaluation of these...
One of the challenges in sensor network is sustaining long-term operation with limited resources such as energy, storage capacity and computing capability. Because the life time of each sensor node affects the life time of whole sensor network, so many researches about prolonging sensor life time have been done. Nonetheless, the most part of such researches have tended to center around the study on...
The immense potential of wireless sensor networks (WSNs) has created a growing awareness of the need for reliability and energy efficiency in such networks. Reliability and energy efficiency are not independent of each other as reliability may be achieved, at the cost of energy, by retransmitting packets. Major reason behind loss of packet in a WSN is collision. Since all transmissions take place...
Reliable transmission service is in dire need for many applications in wireless sensor networks (WSNs). Most existing routing protocols however, seriously suffer from low end-to-end success rates in real deployments. Through extensive experiments on a test-bed of Mica2 nodes, we identify three key problems that hinder the reliable packet delivery. In order to address these problems and therefore to...
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