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WSNs (wireless sensor networks) are networks that hundreds or thousands of nodes poured in a field and nodes try to send sensed event to base station (BS). In many cases, the BS isn't in the field and is so far away from nodes. Energy efficiency is one of the major concerns in wireless sensor networks since it impacts the network lifetime. So instead of transmitting directly to BS, in hierarchical...
With the increasing popularity of wireless sensor networks in hostile environments it would be desirable to have more reliable ways of delivering collected information to its destination. With a common scenario involving nodes in a sensor network relaying data back to a gateway or router device, which is connected to a backhaul network, the question arises whether this single point of failure could...
This paper presents an original performance analysis of the contention-based channel reservation schemes, namely UNI MAC in wireless communication systems. Here we mathematically derive the expression of the performance in term of success rate where the impact of misbehaving users is also taken into account. Validated with the simulation results, our numerical results show that the overall performance...
This paper describes the wireless wire (WiWi) architecture and the protocol performing efficient wireless communication along a strip of pervasive devices, with short- range transmission capabilities. The system is synchronous and shows deterministic properties in terms of throughput and latency. Fault tolerance is also guaranteed by a simple but robust backup algorithm that organizes pervasive devices...
IEEE 802.15.4 is a current major technology for low- rate low-power wireless personal area networks (WPANs). To study the reliability of its medium access control (MAC) function, in this paper we evaluate its packet dropping rate performance with focus on the reason to drop a packet. Considering the compatibility with the original protocol, when the access failure happens the packet isn't dropped...
Recently, an energy aware data centric routing protocol (EAD), was proposed and its performance outperforms other existing routing protocols such as LEACH. However, EAD has an inherited problem that only closed nodes to the sink will be chosen as gateways which eventually leads into isolating the rest of the network's nodes even though they still have enough power to communicate with the sink. In...
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