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In the current decade, substantial growth in number of wireless sensor network deployments to sense a wide array of data ranging from environmental to healthcare is observed. As these WSNs are designed with the goal to serve their own organisation without futuristic idea of sharing the data with others, their architectures pose a limitation to the purpose of collaboration. A design is presented in...
Design of energy efficient schemes for data gathering is an important concern for lifetime enhancement of wireless sensor networks. Variation in the distances of nodes from the Base Station and differences in inter-nodal distances are primary factors causing unequal energy dissipation among the nodes. Thus energy difference between the various nodes increases with time resulting in degraded network...
In this article, we consider `N' spherical caps of area 4??p were uniformly distributed over the surface of a unit sphere. We study the random intersection graph GN constructed by these caps. we derive the strong law results for the number of isolated vertices in GN: for p = c/Nr, c > 0 for r < 1, there is no isolated vertex in GN almost surely i.e., there are atleast N/2 edges in GN and for...
A mobile ad-hoc network(MANET) is a collection of mobile nodes dynamically forming a temporary network without any fixed infrastructure. The topology of MANETs changes dynamically causing frequent node failures and network partitions. Sharing of information in such networks is a challenging task. MANETs and peer-to-peer networks share several common characteristics such as self-configuration, decentralized...
The lifetime of a wireless sensor network is constrained by the limited energy and processing capabilities of its nodes. The network lifetime can be maximized when the energy of different nodes of the network depletes uniformly during the sensing, processing and forwarding the data to the sink. Since, the energy required per bit for communication is around two orders of magnitude higher than computation,...
With the advent of Wireless Sensor Networks (WSN's) covering a whole gamut of applications which is getting broader by the day and it is indeed necessary to study the nuances in WSN out of which aforementioned is one. WSN's consists of large number of deployed sensor nodes and a base node for aggregating data from deployed sensor nodes. Wireless Sensor Network's (WSN) are attribute based and they...
This paper presents analysis of a geometrical computation based localization mechanism for wireless sensor networks. Authors analyze its accuracy for parameters like number of reference nodes, number of communications and different power level. Multiple anchors are used to analyze the performance of algorithm in terms of mean square error (m.s.e) of localization and no. of communications required...
Mobile ad-hoc networks (MANETs) are infrastructure-less, multi-hop wireless networks. Nodes in the MANET have to be configured with unique addresses for unicast communications. As the nodes are mobile, the centralized administration does not suit for auto-configuration. So, we need a distributed address auto-configuration scheme for MANETs. Most of the existing schemes use DAD to ensure uniqueness,...
Sensors in sensor networks are operated by their embedded batteries and they can not work any more if the batteries run out. The data collected by sensors should be transferred to a sink node through the efficient routes. Many energy efficient routing algorithms were proposed. However, the previous algorithms consume more energy since they did not consider the transmission range and direction. In...
Wireless Sensor Network is data centric network that works on query reply mechanism with various types of quires. Rumor routing is on of the data centric routing algorithm for Wireless Sensor Networks. Literature shows that Rumor routing algorithm is energy efficient than the Ant Colony Optimization, Gossip Routing, Deterministic Flooding and Directed Diffusion. Data centric WSN works has various...
Wireless Mesh Networks (WMNs) have the potential for improving network capacity by employing multiple radios and multiple channels (MRMC). Channel Assignment (CA) is a key issue that plays vital role in defining WMN throughput by efficient utilization of available multiple radios and channels there by minimizing network interference. The two important issues that are needed to be addressed by CA algorithm...
Route optimization support in mobile networks is one of the most important concerns in Next Generation Networks (NGNs). NGNs require an efficient route optimization scheme, optimized specially to support nesting of mobile networks. We propose an Extended Mobile IPv6 route optimization (EMIP) scheme to enhance the performance of nested mobile networks. EMIP scheme is based on MIPv6 route optimization...
The paper evaluates the performance of a CDMA based wireless sensor networks (WSN) with layered architecture in terms of bit error rate (BER) and energy consumption for successful transmission of data packets. Correlation amongst signal and interferers in shadowed environment has been considered. Two kinds of interference namely multiple access interference (MAI) and node interference (NI) are considered...
Mobile adhoc network(MANET) is a ??on the fly?? network of mobile nodes. Packets are routed through mobile nodes instead of any fixed base station. (AODV) is most adopted routing protocol in MANET where a path is established when a node wants to communicate with another node. The period over which the communication proceeds through this path is known as a Session. When the mobility in the network...
Wireless sensor networks (WSNs) have been widely used in a wide variety of applications. Deploying WSNs in unattended environments can cause various security threats. In these scenarios, provisioning user authentication is a critical issue. In this paper, we propose improved robust user authentication scheme for WSNs, which is a variation of strong-password based solution. We have analyzed security...
To avoid the uses of multiple RF chain associated with the multiple antennas, RF switch is most essential component. Multiple antennas systems are used to replace traditional single antennas circuitry in the radio transceiver system in order to improve the transmission capability and reliability. The desired switching system must have low cost and simple structure, yet still can capture all the advantage...
We have seen a dramatically boom in the number of users of mobile communication devices in the last two decade. This magnified the need of a more efficient and reliable signal scrambler for a cultured society. Mobile Jammer devices are becoming civilian products rather than electronic warfare devices. With increasing number of Mobile users, the need to disable Mobile phones in specific places, where...
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