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Wireless Ad hoc network is a set of wireless devices which move randomly and communicate with other node via radio signal. Ad-hoc networks may be logically represented as a set of clusters by grouping together nodes on the basis of different criteria such as 1-hop and k-hop that are in close boundary with one another. Clusters are formed by diffusing node identities along the wireless links. Different heuristics employ different policies to elect cluster heads. Several of these policies are biased in favour of some nodes. As a result, these nodes should greater responsibility and may deplete their energy faster, causing them to drop out of the network. Therefore, there is a need for load-balancing among cluster-heads to allow all nodes the opportunity to serve as a cluster-head. In this paper, different cluster head election mechanism are discussed in the one hop clustering approach.
Wireless ad-hoc sensor networks and routing data in them is a significant research area. The objective of this paper is to examine resource depletion attacks at the routing protocol layer, which attempts to permanently disable network nodes by quickly draining their battery power. This type of attack is called as vampire attack. Vampire attacks are very difficult to detect because they attack the node only by sending protocol-compliant messages.
Network Security is always foremost and big issue in wired and wireless network. Wireless network, whether it is infrastructure mode or mobile adhoc mode, breaks the barriers of wired network and are easily accessible to everyone but everything is at a cost, the cost is in the form of increased susceptibilities and vulnerabilities of network. Packet delay is a result of poor utilization of network capacity when it is integrated with routing algorithms. Routing protocol contains very serious security issues in adhoc network. The code of AODV and DSDV are having such issues and new protocol are extended in the form of SEAD, SEAR and SAODV. This paper analyses the ways the security is breached by the hackers who emerge as malicious node in Infrastructure as well as in adhoc mode of network. The handiwork is prepared by way of Developing experimental Testbed and simulation in NS2 then proper measure are proposed in order to overcome all the problems.
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Cognitive Radio (CR) is an adaptive, intelligent radio and network technology that can automatically detect available channels in a wireless spectrum and change transmission parameters enabling more communications to run concurrently and also improve radio operating behavior. We are going to discuss topology control and routing issues in CR-MANETs and propose a distributed prediction-based cognitive topology control (PCTC) scheme to provision cognition capability to routing in CR-MANETs. PCTC is a middleware residing between CR model and routing makes use of cognitive link availability prediction based on that it captures the dynamic changes of topological and constructs an efficient and reliable topology which improves the end to end Network performance such as throughput and Delay. A simulation result also ensures the effectiveness of the proposed scheme.
Due to the wide range of application of Wireless Sensor Networks (WSN) the past few years have witnessed the potential use of it and also become a hot research area now a days. One the main degradation of WSN is that sensor nodes are battery powered and deployed in harsh environment so it is not possible to recharge or replace the batteries all the time the node fails or dead. WSN are used in various applications like environment monitoring, health care, military, industrial control units and in various other environments. Routing protocols developed for various other adhoc networks such as MANET, VANET etc can’t apply directly in WSN due to energy constrains of nodes. It is proved that sensor nodes require much energy to transmit data rather than sensing thus routing protocol developed for WSN should be efficient so that the network lifetime can be prolonged. In this paper, a survey on various Clustering routing protocols has been done indicating their merits