Challenges in Wireless Sensor Networks

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Abstract One of the major challenges in wireless sensor networks (WSNs) deployment is to decrease sensor node's energy consumption to prolong the lifetime of the finite-capacity batteries. Using multihop has been viewed as one of the main techniques to prolong operational lifetime in wireless sensor networks. In this paper we offer a study on transmission power control in IEEE 802.15.4 multihop wireless sensor networks using typical Telosb platform parameters, which is IEEE 802.15.4 standard compliant. Our simulation and numerical analytical results illustrate that energy spent to send a packet in network system using short-range multihop path instead of single hop does not necessarily save energy as suggested by some of the earlier research. In this paper we offer a new approach to test this at the physical layer and provide numerical analysis and simulation performance results for energy consumption in multihop WSNs. wireless sensor network, energy efficiency, transmission power control, multihop 1 Introduction ensor networks are distributed networks made up of small sensing devices equipped with a processor, memory and the ability for short-range wireless communication. Recently, ad hoc WSNs have gained tremendous attention in research communities and commercial applications, partly due to ad hoc wireless networks' ability to establish connectivity without the need for pre-existing infrastructure, and the fact that these networks are envisioned to support a wide range of embedded applications. The ability of networks to be established without pre-existing infrastructure provides a significant benefit in rapid sensor nodes deployment, and a reduction in the cost of... ... middle of paper ... ...t channel, a channel scan function in search of a beacon, activation and deactivation of radio transceiver, ability to measure received packet energy known as energy detection (ED) , the ability to measure the quality of the received signal for each packet known as link quality indicator (LQI) and the ability to check for activity in the medium known as clear channel assessment (CCA) [ieee15:2006]. 2.2 Network Topologies Depending on the application requirements, the IEEE 802.15.4 standard supports two network topologies: star and peer-to-peer . In our work we consider the peer-to-peer topology since it allows more complex networks such as mesh topology to be implemented, and it offers more flexibility. In peer-to-peer networks, devices can communicate with one another as long as they are within the range of one another [ieee15:2006].
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