scholarly journals OPTIMAL ROUTE SELECTION STRATEGY FOR QOS IMPROVEMENT

2012 ◽  
pp. 136-143
Author(s):  
MANJHARI JAIN ◽  
AKHILESH A. WAOO ◽  
P. S. Patheja ◽  
SANJAY SHARMA
Keyword(s):  
Ad Hoc ◽  
Performance Metrics ◽  
Channel Model ◽  
Single Channel ◽  
High Reliability ◽  
Heavy Traffic ◽  
Selection Strategy ◽  
Link Failure ◽  
Mobile Nodes ◽  
Optimal Paths

An ad-hoc mobile network is a collection of mobile nodes that are dynamically and arbitrarily located in such a manner that the interconnections between nodes are capable of changing on a continual basis. Ad hoc nodes operating in a single path, single channel model might experience packet loss and high latency due to the congestion caused. Nodes along the heavy traffic path could reach the maximum bandwidth limit and experience undesirable amounts of packet drop. In Ad hoc networks the nodes are mobile and contain no infrastructure. Certain emergency messages have to be delivered with very low latency and high reliability. An efficient routing protocol should ensure reliable packet delivery in a timely manner. Our Proposed solution is to setup multiple optimal paths based on bandwidth and delay. It allows storing multiple optimal paths based on Bandwidth and delay. At time of link failure, it will switch to next available path. To set up multiple paths, we have used the information that we get in the RREQ packet and also send RREP packet to more than one path It reduces overhead of local route discovery at the time of link failure. We investigated the performance metrics namely Retransmission Attempt, Media Access Delay, Network Load by through OPNET simulation.

Effect of Wireless Channels on the Performance of Ad Hoc Networks

2011 ◽  
pp. 333-345
Author(s):  
Q. Nasir
Keyword(s):  
Ad Hoc ◽  
Performance Metrics ◽  
Channel Model ◽  
Model Simulation ◽  
Wireless Channel ◽  
Mobile Nodes ◽  
Propagation Models ◽  
Reflection Model ◽  
Dynamic Source ◽  
Hoc Networks

Mobile ad hoc (MANET) network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. To accomplish forwarding a packet to its destination, a routing protocol is used to discover routes between these nodes. This article presents a variety of results for packet-level simulations for the popular protocol—dynamic source routing (DSR)—when different channel models are used. Different radio propagation models representing the wireless channel have been proposed over the years, each one being suitable for a certain situation. The simplest model that represents wireless propagation is the freespace model. Other propagation models are the tworay ground reflection model and the shadowing model. Simulation results show that the performance metrics are highly affected by the channel model used, even the energy left or the number of nodes left alive are also different.

AODV Energy Routing Mechanism for Multi-Channel Multi-Interface Ad Hoc Networks (EMCMI-AODV) Using a Dynamic Programming Algorithm

2016 ◽  
Vol 7 (4) ◽  
pp. 1-16
Author(s):  
Hassan Faouzi ◽  
Hicham Mouncif ◽  
Mohamed Lamsaadi
Keyword(s):  
Ad Hoc Networks ◽  
Ad Hoc ◽  
Performance Metrics ◽  
Single Channel ◽  
Routing Algorithm ◽  
Dynamic Programming Algorithm ◽  
Radio Spectrum ◽  
Programming Algorithm ◽  
Shortest Path Routing ◽  
Hoc Networks

Energy consumption is a significant issue and offers a rich scope for research in ad hoc networks. However, many energy efficiency routing protocols are configured to use only a single Interface single Channel (SISC). As a result, these networks rarely can fully exploit all bandwidth available in the radio spectrum provisioned by the standards. This paper proposes two extensions to the shortest-path routing algorithm that finds routes to balance load based on residual energy of nodes and hops of route, one uses Floyd Warshall and the other uses Bellman-Ford algorithm. The protocols work with nodes equipped with a multiple network interface to overcome the problems of SISC where each node is equipped with a single antenna to ensure connectivity with all other nodes. The proposed protocols primarily exploit the idea of interaction among MAC and Network layers by using a novel cross-layer routing solution. The performance of the proposed protocols were evaluated using different scenarios and performance metrics, and achieved good results compared with similar works in the field.

scholarly journals Routing Algorithm To Eliminate Stale Routes (RAESR) In Mobile Ad Hoc Networks

2019 ◽  
Vol 8 (12) ◽  
pp. 4503-4509
Keyword(s):  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Routing Algorithm ◽  
High Mobility ◽  
Propagation Delay ◽  
Link Failure ◽  
Mobile Nodes ◽  
Routing Overhead ◽  
Mobile Ad Hoc ◽  
Hoc Networks

Mobile Ad-hoc Network (MANET) is a collection of self sustaining mobile nodes which are connected through many wi-fi links to form a temporary communication for sharing information between the users. Mobile nodes behave as a host as well as router. As nodes in MANET posse’s mobility in traits frequently leads to irregular link between the nodes. Link failure directs a significant routing overhead during high mobility and also maintaining all the information associated with nodes and routing paths are considered as an extra overhead on the table. In order to overcome these issues, the routing algorithm to eliminate stare routed in routing cache. The neighbor degree centrality table is introduced to recognize the valuable nodes, using the valuable nodes the routes are discovered and link failure information are disseminated across the network wide. The results and findings show that the elimination of stale routes leads to significant reduction in routing overhead which in turn reduces the route error propagation delay

scholarly journals The feasibility of obstacle awareness forwarding scheme in a visible light communication vehicular network

2020 ◽  
Vol 10 (6) ◽  
pp. 6453
Author(s):  
Lisa Kristiana ◽  
Arsyad Ramadhan Darlis ◽  
Irma Amelia Dewi
Keyword(s):  
Visible Light ◽  
Ad Hoc ◽  
Heavy Traffic ◽  
Signal Transmission ◽  
Visible Light Communication ◽  
Vehicular Network ◽  
Mobile Nodes ◽  
V2v Communication ◽  
City Environment ◽  
High Rise

A vehicular-to-vehicular (V2V) communication is a part of a vehicular ad-hoc network (VANET) that emerges recently due to the heavy traffic environment. V2V is a frequently changing network since it implements vehicles as mobile nodes. The challenges in implementing V2V are the relatively short duration of possible communication and the uneven city environment caused by high rise buildings or other objects that distract the signal transmission. The limited transmitting duration between vehicles requires efficient coordination and communication. This work focuses on the utility of visible light communication in vehicular network (VLC-VN) in data transmitting and the obstacle awareness in the forwarding scheme based on our knowledge in previous researches. The result of evaluating the feasibility of VLC-VN forwarding in a freeway environment the transmission delay is lower than 1 second in 500 byte data transmission, however it reaches to only about 4% in throughput as a drawback.

scholarly journals Performance analysis of Dynamic MANET Ondemand (DYMO) Routing protocol

2011 ◽  
pp. 120-128
Author(s):  
Sukant Kishoro Bisoyi ◽  
Sarita Sahu
Keyword(s):  
Ad Hoc Networks ◽  
Comparative Study ◽  
Network Topology ◽  
Ad Hoc ◽  
Performance Metrics ◽  
Network Routing ◽  
Delivery Ratio ◽  
Mobile Nodes ◽  
Hoc Networks ◽  
The Impact

Routing in a MANET is challenging because of the dynamic topology and the lack of an existing fixed infrastructure. In such a scenario a mobile host can act as both a host and a router forwarding packets for other mobile nodes in the network. Routing protocols used in mobile ad hoc networks (MANET) must adapt to frequent or continual changes of topology, while simultaneously limiting the impact of tracking these changes on wireless resources. The DYMO protocol intended for the use by mobile nodes in wireless multihop ad hoc networks. It can adapt to the changing network topology and determine unicast routes between nodes within the network. This paper presents a comprehensive summarization and a comparative study of the Dynamic MANET On-demand (DYMO) protocol for MANET and simulation analysis of existing protocols DSR and AODV and comparison among them under varying number of nodes. Comparative study shows that DYMO is only a good choice if the nodes are mobile and wireless multihop. We have compared the performance of DSR and AODV with DYMO protocol by taking some performance metrics. Result shows that DYMO simulation provides better performance than DSR when compared in a given network topology with respect to throughput, packet loss, delay, packet delivery ratio, normalized routing load.

scholarly journals Impact of Sparse and Dense Deployment of Nodes Under Different Propagation Models in Manets

2020 ◽  
Vol 9 (1) ◽  
pp. 61-84
Author(s):  
Altaf Hussain ◽  
Tariq Hussain ◽  
Iqtidar Ali ◽  
Muhammad Rafiq Khan
Keyword(s):  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Performance Metrics ◽  
High Mobility ◽  
Signal Strength ◽  
Propagation Model ◽  
Strong Impact ◽  
Mobile Nodes ◽  
Propagation Models ◽  
The Impact

Mobile Ad-hoc Network (MANET) is the most emerging and fast-expanding technology in the last two decades. One of the major issues and challenging areas in MANET is the process of routing due to dynamic topologies and high mobility of mobile nodes. The efficiency and accuracy of a protocol depend on many parameters in these networks. In addition to other parameters node velocity and propagation models are among them. Calculating signal strength at the receiver is the responsibility of a propagation model while the mobility of nodes is responsible for the topology of the network. A huge amount of loss in performance is occurred due to the variation of signal strength at the receiver and obstacles between transmissions. In this paper,it has been analyzed to check the impact of different propagation models on the performance of Optimized Link State Routing (OLSR) in Sparse and Dense scenarios in MANET. The simulation has been carried out in NS-2 by using performance metrics as average packet drop average latency and average Throughput. The results predicted that propagation models and mobility have a strong impact on the performance of OLSR in considered scenarios. 

scholarly journals A new energy consumption technique for mobile ad hoc networks

2019 ◽  
Vol 9 (5) ◽  
pp. 4147
Author(s):  
S. Alani ◽  
Zahriladha Zakaria ◽  
Herwansyah Lago
Keyword(s):  
Energy Consumption ◽  
Routing Protocols ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Performance Metrics ◽  
Network Routing ◽  
Mobile Nodes ◽  
Minimum Number ◽  
Mobile Ad Hoc ◽  
Hoc Networks

A dynamic temporary network is created through wireless mobile nodes without the need for considerable infrastructure as well as a central manager. In a mobile ad hoc network, routing protocols allow a mobile for transmission and receiving packets. In the last decade, many variants have come up for the AODV. A minimum number of hop counts are chosen for enhancing routing protocols to include additional factors that can have an impact on path selections. As the distance between each node grows, the transmission power also rises accordingly. Hence, this impacts the network’s entire performance and the most important feature is the quality of service. Most of the traditional routing protocols include energy consumption levels of the nodes and various parameters, like residual battery power, consumption of energy per packet and energy needed per transmission. A new technique is proposed in this paper to enhance the routing efficiency by making use of lion optimization algorithm after identifying all possible paths in the network. This technique not only enhances the energy efficiency of each node but also the performance metrics.

Study on Performance Comparison of OLSR and AODV Routing Protocols

2014 ◽  
Vol 672-674 ◽  
pp. 1977-1980 ◽  
Author(s):  
Yan Ming Cheng ◽  
Jing Niu ◽  
Tie Jun Sun
Keyword(s):  
Routing Protocol ◽  
Routing Protocols ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Performance Metrics ◽  
Performance Comparison ◽  
Delivery Ratio ◽  
Centralized Control ◽  
Mobile Nodes ◽  
Routing Overhead

A Mobile Ad hoc network (MANET) is a network consisting of a set of wireless mobile nodes, in which nodes can communicate with each other without centralized control or established infrastructure. To obtain a better understanding of AODV (Ad hoc On-Demand Distance Vector Routing Protocol) and OLSR (Optimized Link State Routing Protocol) routing protocols, different performances are simulated and analyzed using OPNET modeler 14.5 with the various performance metrics, such as PDR (Packet Delivery Ratio), end-to-end delay and routing overhead. Only effect of mobility is analyzed in the paper. As a conclusion, in mobility case, routing overhead is not greatly affected by mobility speed in AODV and OLSR, and the PDR of OLSR is decreased as the node speed increased, while AODV is not changed. As to delay, AODV is always higher than OLSR in both static and mobility cases.

scholarly journals DSDV Extension to Enhance the Performance of Ad Hoc Networks in High Diverse-Velocity Environments

2020 ◽  
Vol 14 (06) ◽  
pp. 95
Author(s):  
Mada’ Abdel Jawad ◽  
Saeed Salah ◽  
Raid Zaghal
Keyword(s):  
Ad Hoc Networks ◽  
High Speed ◽  
Ad Hoc ◽  
Performance Metrics ◽  
Delivery Ratio ◽  
Network Simulator ◽  
Mobile Nodes ◽  
Average Delay ◽  
Congested Networks ◽  
Hoc Networks

<p class="0abstractCxSpFirst">Mobile Ad-Hoc Networks (MANETs) are characterized as decentralized control networks. The mobile nodes route and forward data based on their routing information without the need for routing devices. In this type of networks, nodes move in an unstructured environment where some nodes are still fixed, others are moving in a constant velocity, and others move with diverse velocities; and thus, they need special protocols to keep track of network changes and velocity changes among the nodes. Destination Sequenced Distance-Vector (DSDV) routing protocol is one of the most popular proactive routing protocols for wireless networks. This protocol has a good performance in general, but with high speed nodes and congested networks its performance degrades quickly.</p><p class="0abstractCxSpLast">In this paper we propose an extension to the DSDV (we call it Diverse-Velocity DSDV) to address this problem. The main idea is to modify the protocol to include node speed, determine update intervals and the duration of settling time. To evaluate the performance of the new protocol, we have carried a number of simulation scenarios using the Network Simulator tool (NS-3) and measured relevant parameters such as: packet delivery ratio, throughput, end-to-end delay, and routing overhead. We have compared our results with the original DSDV and some of its new variants. The new protocol has demonstrated a noticeable improvement of performance in all scenarios, and the measured performance metrics outperform the others except the average delay where the performance of the new protocol was modest.</p>

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