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Localization is an important research issue in Wireless Sensor Networks (WSNs). Recently, hop-count-based localization has been proposed as a cost-effective alternative to range-based localization algorithms. Traditionally, hop-counts between any pair of nodes can only take on integer values regardless of relative positions of nodes in the hop. We show that by partitioning a node's one-hop neighbor...
Currently, the field of wireless sensor networks (WSNs) is becoming increasingly important and a challenging research area. Advancements in sensor networks enable a wide range of environmental monitoring and object tracking applications. Moreover, multihop routing in WSN is affected by new nodes constantly entering or leaving the network. Therefore, nature based self-organized and independent mechanisms...
Environmental monitoring and urban sensing are seen as the most important areas of research. Urban sensing through integration of technologies is now been seen in the likes of vehicle tracking. This interesting field is still in its early stages. Due to the environmental pollution caused by the vehicles most of the major cities of the world have developed serious health issues. The need to precisely...
Modified optimized link state routing (M-OLSR) has been developed for adaptability in wireless mesh networking (WMNs) scenarios and exhibits a much better scalability of traffic load and mobility in sparse and dense network. The protocol uses some refresh timers for periodic updates of link information and for subsequent topology maintenance. In this paper, we investigate the impact of configuring...
Wireless sensor networks have become very useful in so many applications. Applications such as grape monitoring, insect movement monitoring and etc., that allows connectivity between sensor network and Internet can solve many remote control and monitoring problems. IPv6 over low power WPAN (6lowPAN) protocols are suitable technology that can be adapted in wireless sensor network. The deployment of...
Wireless sensor networks (WSNs) consist of a lot of sensor nodes with limited battery, memory, and processing capability. Therefore, in WSNs, effective MAC protocol is required to maximize battery life of sensor nodes, to reduce transmission delay, and to minimize communication errors. Routing enhanced MAC (RMAC) uses the path information on network layer so that multi-hop transmission within a cycle...
The mobility of nodes with a purpose called as robotic-mobility is used for replenishing energy to strategic military applications. Assuming a CDS based backbone in place, we give a technique of maintaining the location of mobile node for a given topology setting. We show that using a weighted CDS reduces the maintenance of location updates for mobile node. The complexity of our mobile-node maintanence...
The energy constraint in wireless sensor networks (WSNs) advocates the design and use of low power components in sensor nodes. Commercial general purpose microcontrollers are not suitable for such applications and have motivated us towards the design of a low-power microcontroller tailored for the WSN application domain. In this paper, we study the characteristics of typical WSN applications and present...
The 2.4 GHz industrial, science and medical (ISM) band is a license free band allocated for a variety of consumer applications: environmental monitoring, agriculture, medical care, smart buildings, factory monitoring and automation, and numerous military applications. This project focuses on the adaptive interference avoidance scheme for IEEE 802.15.4 to allow coexistence with IEEE 802.11b/g in the...
To provide personal services in a ubiquitous environment, it is necessary to identify users without giving a psychological pressure to them. This paper proposes a configuration of the sensor network used to identify a user based on his or her sole pressure distribution on a sensor mat that uses a hetero-core optical fiber. Specifically, it presents a filtering algorithm used to determine the pressure...
To maximize the gain of multi-hop transmissions, we have to let the number of hops as small as possible, decreasing multi-hop transmission delay. In this paper, we propose how the average number of hop counts can be reduced in wireless multi-hop networks by constructing a few long-range edges that can act as if they were highways in the networks. For this purpose, we adopt the concept of small-world...
A sensor network consisting of sensors for slope deformation and soil-water content was designed, developed, and evaluated in a miniature slope model. The sensor network is buried vertically underground, and is composed of pipe segments to form a column. Each segment contains a tri-axial accelerometer for tilt measurements and capacitive-type sensors for soil moisture measurement. Measurements taken...
The use of wireless technology for intra-vehicle communication is becoming possible in replacing in-scalable, high weight and high manufacture cost automotive wired networks. Ultra-Wide Band (UWB) is emerging as an ideal alternative for implementing an Intra-Vehicle Wireless Sensor Network (I-VWSN) due to its very high data rate and low power consumption. However, the current IEEE MAC Layer Protocol...
Information exchange in a microgrid is vital for monitoring and control purposes. Before any monitoring and control algorithms can be applied to a microgrid system, a suitable, cost-effective and reliable communication network has to be built for information transfer to and from all distributed energy resources and other control devices. To set up a relatively easy-installation communication network...
In this paper, we present a grid-based fault-tolerant event detection scheme for wireless sensor networks. The sensor field is divided into square-shaped cells, called virtual grids here, where sensor nodes in each grid form a cluster. Each grid is further divided into subgrids of equal size. Each cluster head receives sensor readings of its member nodes and counts the number of sensor nodes reporting...
Current research trend in the RF wireless power transfer has a shift to new paradigm. Optimization of power transfer for wireless sensor networks has a new facelift due to the evolution of rectifier antenna (rectenna). Wireless powering of sensors with Rectenna has kindled the interest of research society in the present trend. The research developed in the paper bounds within the wireless powering...
As sensor nodes are powered by battery of limited lifespan, energy consumption has always been an important issue in sensor networks. New generation of sensor network technology bring about the possibility of constructing a spatial index over a sensor network such that sensor queries are forwarded only to the relevant nodes. Existing spatial indices share the common feature of using the same node...
The paper evaluates the performance of a CDMA based wireless sensor networks (WSN) in terms of outage probability and BER, considering correlation among interferers in shadowed environment. An appropriate model for the interference power, outage and BER are presented for a single hop communication. Detection probability is also evaluated in shadowed environment. The effects of node density, minimum...
A new addressing protocol, TTDA (two-tier dynamic addressing protocol), is proposed for cluster-based wireless sensor networks in this paper. Two-tier address assignment is adopted in TTDA, in which the sink node assigns addresses for the cluster heads using Huffman coding to reduce energy consumption by allocating shorter addresses for nodes far from sink, and the cluster head nodes assign addresses...
Deployment of sensors and routing inside an irregular region is one of the most fundamental challenges of Wireless Sensor Networks. The performance of an effective and efficient sensor network is highly related to the proper configuration and design of the network and effective communication between the sensors deployed. In real scenario, the area that needs to cover, may suffer from natural geographical...
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