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Effect of transmission range on Ad Hoc on Demand Distance Vector Routing Protocol

Journal of Computer and Communications 2016年第2期4卷 34-46页

作者： Mohammad Izharul Hasan Ansari Surendra Pal Singh Mohammad Najmud Doja Department of Computer Science & Engineering NIMS University Jaipur India Department of Computer Science & Engineering NIMS University Jaipur India Department of Computer Engineering JMI University New Delhi India

The necessary background as well as the details of simulation was presented to simulate and evaluate the performance of the ad hoc on-demand distance vector routing protocol in mobile ad hoc network with the help of the network simulator NS2 using the common transmission range to deliver the data packets at the destination node. The number of participating nodes played an important role to predict the conditions for the best performance of the protocol with respect to throughput, delay, packet delivery ratio, drop packets, consumed and residual energy of the network. Further, the efforts can be put to control the transmission range dynamically and overheads for reducing the energy consumption in the network and improving its lifetime of the nodes and the lifespan of the network.

关键词： MANET Routing Protocol Network Simulator transmission range Throughput Delay Packet Delivery Ratio Energy Consumption Efficiency and Lifetime

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CNR:A Cluster-Based Solution for Connectivity Restoration for Mobile WSNs

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Computers, Materials & Continua 2021年第12期69卷 3413-3427页

作者： Mahmood ul Hassan Amin Al-Awady Khalid Mahmood Shahzad Ali Ibrahim Algamdi Muhammad Kashif Saeed Safdar Zaman Department of Computer Skills Najran UniversityNajran66241Saudi Arabia Department of Information Systems College of Science and ArtsKing Khalid UniversityMahayil Asir63317Saudi Arabia Department of Computer Science Jouf UniversityTabarjal76769Saudi Arabia Department of Computer Science Community College Mahayil AsirKing Khalid UniversityMahayil63317Saudi Arabia Federal Directorate of Education Department of Computer ScienceIslamabad44000Pakistan

Wireless Sensor Networks(WSNs)are an integral part of the Internet of Things(IoT)and are widely used in a plethora of ***,sensor networks operate in harsh environments where human intervention is often restricted,which makes battery replacement for sensor nodes *** failure due to battery drainage or harsh environmental conditions poses serious challenges to the connectivity of the *** a connectivity restoration mechanism,node failures ultimately lead to a network partition,which affects the basic function of the sensor ***,the research community actively concentrates on addressing and solving the challenges associated with connectivity restoration in sensor *** energy is a scarce resource in sensor networks,it becomes the focus of research,and researchers strive to propose new solutions that are energy *** common issue that is well studied and considered is how to increase the network’s life span by solving the node failure problem and achieving efficient energy *** paper introduces a Clusterbased Node Recovery(CNR)connectivity restoration mechanism based on the concept of *** is a well-known mechanism in sensor networks,and it is known for its energy-efficient operation and *** proposed technique utilizes a distributed cluster-based approach to identify the failed nodes,while Cluster Heads(CHs)play a significant role in the restoration of *** simulations were conducted to evaluate the performance of the proposed technique and compare it with the existing *** simulation results show that the proposed technique efficiently addresses node failure and restores connectivity by moving fewer nodes than other existing connectivity restoration *** proposed mechanism also yields an improved field coverage as well as a lesser number of packets exchanged as compared to existing state-of-the-art mechanisms.

关键词： WSNs CHs CNR transmission range connectivity restoration node failure cluster communication range

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Delay-aware reliable broadcast scheme based on power control for VANETs

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The Journal of China Universities of Posts and Telecommunications 2014年第1期21卷 26-35页

作者： GUO Wei-jie HUANG Liu-sheng SUN Quan XU Hong-li ZHANG Hao-ran School of Computer Science and Technology University of Science and Technology of China Suzhou Institute for Advanced Study University of Science and Technology of China

In vehicular Ad-hoc network（VANET）, many multi-hop broadcast schemes are employed to widely propagate the warning messages among vehicles and the key is to dynamically determine the optimal relay vehicle for retransmission. In order to achieve reliable and fast delivery of warning messages, this paper proposes a delay-aware and reliable broadcast protocol（DR-BP） based on transmit power control technique. First, a comprehensive model is derived to evaluate the transmission in vehicle-to-vehicle communications. This model considers the wireless channel fading, transmission delay and retransmissions characters occurring in the physical layer/medium access control（PHY/MAC） layer. Then, a local optimal relay selection mechanism based on the above model is designed. In DR-BP scheme, only the vehicle selected as the optimal relays can forward warning messages and the transmit power is time-varying. Finally, extensive simulations verify the performance of DR-BP under different traffic scenarios. Simulation results show that DR-BP outperforms the traditional slotted 1-persistence（S1P） and flooding scheme in terms of packets delivery ratio and transmission delay.

关键词： transmission range delay-aware reliable power control relay selection VANET

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