Wireless Communication

S. Sakthivel ¹, E. Kannan ¹

Affiliations
1 Vel Tech Dr.RR & Dr.SR Technical University, Avadi, Chennai-62, IN

Abstract

Heterogeneous wireless network with multi-home clients combine various wireless technologies and provide universal access. Nowadays these wireless networks which is accessed by portable devices with multiple interfaces to access Internet. Recently previous work has mainly focused on reducing access delay and power consumption for data broadcast in wireless network. In this paper, we propose a new data broadcast mechanism with network coding in heterogeneous wireless networks. Our mechanism adaptively clusters the mobile hosts in fewer cells to minimize the bandwidth consumption. In addition, we adaptively code the data according to the data temporarily stored in each mobile host with a distributed manner. Our mechanism allows each delivered message to be coded from only a subset of data to further reduce the number of required messages. We formulate the cell selection and broadcast coding problem with integer programming and prove that the problem is NP-hard. We design a distributed algorithm based on LaGrange and relaxation. Our algorithm needs no server to record the location, queried, and stored information of receivers. Moreover, our algorithm is adaptive to the dynamic group membership, mobility, queried, and stored data of receivers.

Keywords

Cell Selection Problem (Cop), Broadcast Coding Problem (Bop), Data Broadcast Mechanism, Bandwidth Consumption and Streaming.

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E. Kannan ¹, Resmi R. Nair ², P. Visu ¹, S. Koteeswaran ¹

Affiliations
1 Department of CSE, Vel Tech Dr.RR & Dr.SR Technical University, Chennai, IN
2 Dept of ECE, Vel Tech Engineering College, Chennai, IN

Abstract

A mobile ad hoc network (MANET) is a temporary infrastructure less network, formed by a set of mobile hosts. It dynamically establishes its own network without relying on any central administration. In a MANET each device is free to move independently in any direction, and will therefore change its links to other devices frequently. Mobile ad hoc networking works properly only if the participating nodes cooperate in routing and forwarding. However, performing network functions consumes energy and other resources. To save its energy a node may behave selfishly and uses the forwarding service of other nodes without correctly forwarding packets for them. These nodes must be identified and excluded from the cooperative part of the network, as they only consume resources and don’t contribute to the infrastructure. In MANET’s routing misbehavior can severely degrade the performance at the routing layer. Specifically, nodes may participate in the route discovery and maintenance process but refuse to forward data packets. Some solutions have been recently proposed to detect and mitigate such selfish nodes, but almost all these solutions rely on the watchdog technique in their monitoring components, which suffers from many problems. This paper proposes a new approach to mitigate some of the above problems. A misbehavior detection system aims at removing the MANET vulnerability. In this approach a system is built to detect misbehaving nodes in mobile ad hoc networks.

Keywords

Mobile Ad Hoc Networks, Routing Misbehavior, Selfishness, Network Security.

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S. Malini ¹, E. Kannan ², A. Valarmathi ³

Affiliations
1 Department of Computer Applications, PABCET, Tiruchirappalli, IN
2 Veltech Dr.R.R & Dr.S.R Technical University, Chennai, IN
3 Department of Computer Applications, Anna University of Technology, Tiruchirappalli, IN

Abstract

A Mobile Ad-hoc Network (MANET) is a dynamic wireless network that can be formed without the need for any pre-existing infrastructure in which each node can act as a router. The suitability of multi-path AOMDV routing protocol in such a network was accessed in mobility biased MANET and compared with the performance of its single-path counterpart AODV. A predefined network topology was created and NS-2 simulation was performed at different mobility based scenarios. The performance of AODV and AOMDV was evaluated using responses such as throughput, packet loss and end-to-end delay. The results indicated that AODV exhibited higher throughput and lower end-to-end delay. In the case of AOMDV, the more frequent route discovery might have hampered the available bandwidth and exhibited poor performance. The only positive aspect of AOMDV was its performance with lower packet loss. The routing overhead associated with multi-path routing is found to be the major concern in multipath based routing protocols.

Keywords

MANET, AODV, AOMDV, Performance Metrics.

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S. Raj Anand ¹, E. Kannan ², E. Kamalanaban ³

Affiliations
1 Department of CSE, Vel Tech. Dr. RR & Dr. SR Technical University, Chennai, IN
2 Vel Tech. Dr. RR & Dr. SR Technical University, Chennai, IN
3 Department of CSE, SV University,Tirupati, IN

Abstract

Wireless sensor networks (WSNs) greatly extend our ability to monitor and control the physical world, as they have become the mark of pervasive technology. One of the main design issues for a sensor network is conservation of the energy available at each sensor node. We split the lifetime of the sensor network into equal periods of time known as rounds. Base stations are relocated at the start of a round. Energy efficient organization is forecasting the position of Mean Square Error for every node in the location. Localization is an important issue in wireless sensor networks as maintaining the location of information is indispensable in applications such as routing, target tracking. Beacons (known-location nodes) are one key approach to achieving localization in wireless networks. In this paper we propose a Beacon Movement Detection Schemes such as Location based, Neighbor based, Energy Saving Scheme, Modeling of Broadcasting Scheme, RSS-based localization and DV-hop using the distance vector exchange so that all nodes in the network get distances, in hops, to the landmarks and reliability factor information for wireless sensor networks during simulations, we evaluate the proposed schemes and examine their capability to improve the localization accuracy in events of beacon movement which improves localization.

Keywords

Energy Efficient Organization, Localization, RSS-Based Localization Scheme, Energy Saving Scheme, DV-Hop, Signal Strength.

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T. Senthilmurugan ¹, E. Kannan ²

Affiliations
1 Vel Tech DR.RR & DR.SR Technical University, Avadi, Chennai, IN
2 Department of CSE, Vel tech DR.RR & DR.SR Technical University, Avadi, Chennai, IN

Abstract

In this paper, we present new protocol design scenario like Re - Pro Routing Protocol (RPRP) for Broadcasting in wireless mobile Ad-hoc Network and a comparative performance for Mobile Ad hoc Networks protocols like as Ad-hoc On-Demand Distance Vector Routing protocol focusing on the effects of changes such as the increasing number of receivers or sources and increasing the number of nodes. Although some simulation results of MANET protocols have been published before, these protocols have not been compared in isolation. A systematic performance evaluation of these protocols is done by performing certain simulations under NS2.

Keywords

MANET, Reactive Routing Protocol, Proactive Routing Protocol, Broadcasting.

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