Current Issue : January - March Volume : 2016 Issue Number : 1 Articles : 6 Articles
The Wireless Sensor Network (WSN) is spatially distributed autonomous sensor to sense special\ntask. WSN like ZigBee network forms simple interconnecting, low power, and low processing capability\nwireless devices. The ZigBee devices facilitate numerous applications such as pervasive\ncomputing, security monitoring and control. ZigBee end devices collect sensing data and send\nthem to ZigBee Coordinator. The Coordinator processes end device requests. The effect of a large\nnumber of random unsynchronized requests may degrade the overall network performance. An\neffective technique is particularly needed for synchronizing available node�s request processing to\ndesign a reliable ZigBee network. In this paper, region based priority mechanism is implemented\nto synchronize request with Tree Routing Method. Riverbed is used to simulate and analyze overall\nZigBee network performance. The results show that the performance of the overall priority\nbased ZigBee network model is better than without a priority based model. This research paves\nthe way for further designing and modeling a large scale ZigBee network....
This paper presents an in-depth evaluation of Wireless Sensor Networks. Wireless Sensor Networks\nhave been highlighted as the major component that enables the development of modern infrastructures,\nsuch as the Smart Grid. As part of an on-going edification process on the subject\nmatter, this paper brings to fore the many important functions and components of Wireless Sensor\nNetworks, including application areas, functional architectures, physical topological design,\ncommunication protocols, routing schemes and Wireless Sensor Network hardware capabilities....
Energy efficiency plays vital roles in wireless communication system due to the ââ?¬Å?energy limited\nbattery serviceââ?¬Â of a mobile station (MS). To ensure longer battery life in WiMAX, a new protocol\nhas been introduced in its IEEE802.16m version. This new sleep mode has extended listening\nwindow and adjustable sleep cycle length. In this paper, we analyze the probability of attaining at\nthree states: serving state, state of timer inactivity and silent state in a simplified statistical model\nusing traffic parameters of arrival rate, pdf (probability density function) of interarrival time and\nits threshold value. Finally we developed a new state transition chain of the above three states of a\nMS of IEEE802.16m and solved the chain in closed for...
In vehicular ad-hoc networks (VANETs), store-carry-forward approach may be used for data\nsharing, where moving vehicles carry and exchange data when they go by each other. In this approach,\nstorage resource in a vehicle is generally limited. Therefore, attributes of data that have to\nbe stored in vehicles are an important factor in order to efficiently distribute desired data. In VANETs,\nthere are different types of data which depend on the time and location. Such kind of data\ncannot be deployed adequately to the requesting vehicles only by popularity-based rule. In this\npaper, we propose a data distribution method that takes into account the effective life and area in\naddition to popularity of data. Our extensive simulation results demonstrate drastic improvements\non acquisition performance of the time and area specific data....
To enhance the reliability of long wireless link, a relay is placed between transmitter and receiver\nwhich break the link into two parts: transmitter to relay called 1st hop and relay to receiver called\n2nd hop; such arrangement is called two hop wireless links. In two-hop wireless communication\nsometimes 1st and 2nd hops are affected by different types of fading called asymmetric fading environment.\nIn this paper we consider four different combinations of Rayleigh and Nakagami-m\nfading on 1st and 2nd hop to observe the profile of combined pdf (probability density function) and\ncdf (cumulative distribution function). With the help of cdf we determine the variation of outage\nprobability of mixed fading. Finally we plot the SER (symbol error rate) against the SNR (signal to\nnoise ratio) of the 2nd hop for all possible combinations of the two fading taking the SNR of 1st hop\nas a parameter. Although recent literature deals with asymmetric fading environment but in this\npaper instead of details statistical model of such fading we provide the relative scenario of mixed\nfading on 2-hop wireless link....
Wireless Mesh Network is presented as an appealing solution for bridging the digital divide between\ndeveloped and under-developed regions. But the planning and deployment of these networks\nare not just a technical matter, since the success depends on many other factors tied to the\nrelated region. Although we observe some deployments, to ensure usefulness and sustainability,\nthere is still a need of concrete design process model and proper network planning approach for\nrural regions, especially in Sub-Saharan Africa. This paper presents a design methodology to provide\nnetwork connectivity from a landline node in a rural region at very low cost. We propose a\nmethodology composed of ten steps, starting by a deep analysis of the region in order to identify\nrelevant constraints and useful applications to sustain local activities and communication. Approach\nfor planning the physical architecture of the network is based on an indoor-outdoor deployment\nfor reducing the overall cost of the network....
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