This document summarizes an innovative routing algorithm called AntHocNet for mobile ad hoc networks. AntHocNet combines aspects of ant colony optimization and information bootstrapping to address the challenges of routing in dynamic mobile networks. Key elements of AntHocNet include the use of both reactive and proactive routing components, combining ant-based path sampling with a lightweight bootstrapping process to update routing information, and using a composite pheromone metric to guide path selection. The document evaluates the performance impacts of these different design components through simulation studies.
A New Theoretical Approach to Location Based Power Aware RoutingIOSR Journals
This document proposes a new theoretical approach to location based power aware routing in mobile ad hoc networks (MANETs). It aims to extend the network lifetime by improving power utilization during routing. The approach uses nodes' location information, remaining battery power, and bandwidth status to assign link stability and select routes with lower "uptime values" and minimum bandwidth over time. This is hypothesized to better utilize nodes' power sources and bandwidth. The document outlines calculating a root up time factor for each node based on its power backup and required power, and only using nodes with maximum backup. It concludes future work will design and validate a new protocol based on this approach.
A NALYSIS OF ANTHOCNET AND AODV P ERFORMANCE USING NS2 IJCI JOURNAL
Adhoc wireless multi-hop Networks (AHWMNs) are buil
t with wireless nodes arranged in an adhoc manner.
Every node can forward packets and also acts as a s
ource. AODV establishes a path to receiver when it
is
needed by the sender and is on the standardization
process of Internet engineering task force.
AntHocNetwhich is based on ants foraging behavior,
includes reactive and proactive mechanisms.
AntHocNet builds the path as per the requirement of
source and maintains until the end of communicatio
n
session. In this paper performance of AODV and AntH
ocNetare analyzed at different parameters like data
rates, pause times, and speed. Metrics Packet deliv
ery ratio, Loss rate, End to End delay, jitter, and
throughput are evaluated at different simulation ti
mes. Simulation is performed using network simulat
or
NS-2.34 and 802.11b is the MAC protoco
AntNet is an ant colony optimization (ACO) based routing algorithm that uses two types of mobile agents called forward ants and backward ants. Forward ants explore the network concurrently and examine traffic patterns along paths to exchange information with backward ants. Backward ants then use this information to update routing tables, directing data packets towards their destinations in a traffic-adaptive and multipath manner. The algorithm maintains pheromone values, routing tables, link queue observations, and statistical models at each node to probabilistically route packets based on collected network information.
Review and Comparisons between Multiple Ant Based Routing Algorithms in Mobi...IJMER
Along with an increase in the use and development of various types of mobile ad hoc and
wireless sensor networks the necessity for presenting optimum routing in these networks is a topic yet to
be discussed and new algorithms are presented. Using ant colony optimization algorithm or ACO as a
routing method because of its structural similarities to these networks’ model, has had acceptable results
regarding different parameters especially quality of service (QoS). Considering the fact that many
articles have suggested and presented various models for ant based routing, the need for studying and comparing them can be felt. There are about 17 applied ant based routings, this article studies and compares the most important ant based algorithms so as to indicate the quality and importance of each of them under different conditions
This document proposes a modified ant colony optimization (ACO) routing protocol for mobile ad hoc networks (MANETs). The key points are:
1) The protocol is based on swarm intelligence principles and uses mobile software agents like ants to intelligently route packets from node to node.
2) It modifies the standard ACO algorithm to make it power-balanced and achieve faster packet delivery rates by making the pheromone decay dependent on nodes' battery levels.
3) The routing process involves forward and backward ants establishing and maintaining routes between source and destination via probabilistic path selection based on accumulated pheromone levels.
GRAPH THEORETIC ROUTING ALGORITHM (GTRA) FOR MOBILE AD-HOC NETWORKS (MANET)graphhoc
Battlefield theater applications require supporting large number of nodes. It can facilitate many multi-hop
paths between each source and destination pairs. For scalability, it is critical that for supporting network
centric applications with large set of nodes require hierarchical approach to designing networks. In this
research we consider using Mobile Ad Hoc Network (MANET) with multiple clusters. Each cluster
supports a few nodes with a cluster head. The intra-cluster connectivity amongst the nodes within the
cluster is supported by multi-hop connectivity to ensure handling mobility in such a way that no service
disruption can occur. The inter-cluster connectivity is also achieved by multi-hop connectivity. However,
for inter-cluster communications, only cluster heads are connected. The selection of intra-cluster
communications and inter-cluster communications allow scalability of the network to support multiservices
applications end-to-end with a desired Quality of Service (QoS). This paper proposes graph
theoretic approach to establish efficient connection between a source and a destination within each cluster
in intra-cluster network and between clusters in inter-cluster network. Graph theoretic approach
traditionally was applied networks where nodes are static or fixed. In this paper, we have applied the
graph theoretic routing to MANET where nodes are mobile. One of the important challenges in MANET is
to support an efficient routing algorithm for multi-hop communications across many nodes which are
dynamic in nature. However, dynamic behavior of the nodes requires greater understanding of the node
degree and mobility at each instance of time in order to maintain end-to-end QoS for multi-service
provisioning. This paper demonstrates graph theoretic approach produces an optimum multi-hop
connectivity path based on cumulative minimum degree that minimizes the contention and scheduling
delay end-to-end. It is applied to both intra-cluster communications as well as inter-cluster
communications. The performance shows that having a multi-hop connectivity for intra-cluster
communications is more power efficient compared to broadcast of information with maximum power
coverage. Each cluster performs similarly and the algorithm is also used for inter-cluster communications.
Our simulation results show that the proposed graph theoretic routing approach will reduce the overall
delay and improves the physical layer data frame transmission.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Inventions (IJEI) provides a multidisciplinary passage for researchers, managers, professionals, practitioners and students around the globe to publish high quality, peer-reviewed articles on all theoretical and empirical aspects of Engineering and Science.
A New Theoretical Approach to Location Based Power Aware RoutingIOSR Journals
This document proposes a new theoretical approach to location based power aware routing in mobile ad hoc networks (MANETs). It aims to extend the network lifetime by improving power utilization during routing. The approach uses nodes' location information, remaining battery power, and bandwidth status to assign link stability and select routes with lower "uptime values" and minimum bandwidth over time. This is hypothesized to better utilize nodes' power sources and bandwidth. The document outlines calculating a root up time factor for each node based on its power backup and required power, and only using nodes with maximum backup. It concludes future work will design and validate a new protocol based on this approach.
A NALYSIS OF ANTHOCNET AND AODV P ERFORMANCE USING NS2 IJCI JOURNAL
Adhoc wireless multi-hop Networks (AHWMNs) are buil
t with wireless nodes arranged in an adhoc manner.
Every node can forward packets and also acts as a s
ource. AODV establishes a path to receiver when it
is
needed by the sender and is on the standardization
process of Internet engineering task force.
AntHocNetwhich is based on ants foraging behavior,
includes reactive and proactive mechanisms.
AntHocNet builds the path as per the requirement of
source and maintains until the end of communicatio
n
session. In this paper performance of AODV and AntH
ocNetare analyzed at different parameters like data
rates, pause times, and speed. Metrics Packet deliv
ery ratio, Loss rate, End to End delay, jitter, and
throughput are evaluated at different simulation ti
mes. Simulation is performed using network simulat
or
NS-2.34 and 802.11b is the MAC protoco
AntNet is an ant colony optimization (ACO) based routing algorithm that uses two types of mobile agents called forward ants and backward ants. Forward ants explore the network concurrently and examine traffic patterns along paths to exchange information with backward ants. Backward ants then use this information to update routing tables, directing data packets towards their destinations in a traffic-adaptive and multipath manner. The algorithm maintains pheromone values, routing tables, link queue observations, and statistical models at each node to probabilistically route packets based on collected network information.
Review and Comparisons between Multiple Ant Based Routing Algorithms in Mobi...IJMER
Along with an increase in the use and development of various types of mobile ad hoc and
wireless sensor networks the necessity for presenting optimum routing in these networks is a topic yet to
be discussed and new algorithms are presented. Using ant colony optimization algorithm or ACO as a
routing method because of its structural similarities to these networks’ model, has had acceptable results
regarding different parameters especially quality of service (QoS). Considering the fact that many
articles have suggested and presented various models for ant based routing, the need for studying and comparing them can be felt. There are about 17 applied ant based routings, this article studies and compares the most important ant based algorithms so as to indicate the quality and importance of each of them under different conditions
This document proposes a modified ant colony optimization (ACO) routing protocol for mobile ad hoc networks (MANETs). The key points are:
1) The protocol is based on swarm intelligence principles and uses mobile software agents like ants to intelligently route packets from node to node.
2) It modifies the standard ACO algorithm to make it power-balanced and achieve faster packet delivery rates by making the pheromone decay dependent on nodes' battery levels.
3) The routing process involves forward and backward ants establishing and maintaining routes between source and destination via probabilistic path selection based on accumulated pheromone levels.
GRAPH THEORETIC ROUTING ALGORITHM (GTRA) FOR MOBILE AD-HOC NETWORKS (MANET)graphhoc
Battlefield theater applications require supporting large number of nodes. It can facilitate many multi-hop
paths between each source and destination pairs. For scalability, it is critical that for supporting network
centric applications with large set of nodes require hierarchical approach to designing networks. In this
research we consider using Mobile Ad Hoc Network (MANET) with multiple clusters. Each cluster
supports a few nodes with a cluster head. The intra-cluster connectivity amongst the nodes within the
cluster is supported by multi-hop connectivity to ensure handling mobility in such a way that no service
disruption can occur. The inter-cluster connectivity is also achieved by multi-hop connectivity. However,
for inter-cluster communications, only cluster heads are connected. The selection of intra-cluster
communications and inter-cluster communications allow scalability of the network to support multiservices
applications end-to-end with a desired Quality of Service (QoS). This paper proposes graph
theoretic approach to establish efficient connection between a source and a destination within each cluster
in intra-cluster network and between clusters in inter-cluster network. Graph theoretic approach
traditionally was applied networks where nodes are static or fixed. In this paper, we have applied the
graph theoretic routing to MANET where nodes are mobile. One of the important challenges in MANET is
to support an efficient routing algorithm for multi-hop communications across many nodes which are
dynamic in nature. However, dynamic behavior of the nodes requires greater understanding of the node
degree and mobility at each instance of time in order to maintain end-to-end QoS for multi-service
provisioning. This paper demonstrates graph theoretic approach produces an optimum multi-hop
connectivity path based on cumulative minimum degree that minimizes the contention and scheduling
delay end-to-end. It is applied to both intra-cluster communications as well as inter-cluster
communications. The performance shows that having a multi-hop connectivity for intra-cluster
communications is more power efficient compared to broadcast of information with maximum power
coverage. Each cluster performs similarly and the algorithm is also used for inter-cluster communications.
Our simulation results show that the proposed graph theoretic routing approach will reduce the overall
delay and improves the physical layer data frame transmission.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Inventions (IJEI) provides a multidisciplinary passage for researchers, managers, professionals, practitioners and students around the globe to publish high quality, peer-reviewed articles on all theoretical and empirical aspects of Engineering and Science.
The document reviews different secured routing protocols for mobile ad hoc networks and their vulnerabilities. It discusses three main categories of secured routing protocols:
1. Trust oriented protocols which use node trust values to determine routing, but are still vulnerable to malicious nodes gaining control.
2. Incentive oriented protocols which aim to discourage attacks through incentives like credits, but require online access or tamper-proof hardware.
3. Detection and isolation protocols which identify misbehaving nodes but have issues like high overhead, inability to detect certain attacks, and vulnerability to false accusations.
In conclusion, while existing protocols address some attacks, they remain vulnerable or impractical in many cases. A robust, lightweight approach is still needed to
C OMPARISON OF AODV AND ANTHOCNET IN S TATIC W IRELESS N ETWORKIJCI JOURNAL
This document compares the performance of the AODV and AntHocNet routing protocols in static wireless networks. It presents simulation results for packet delivery ratio, end-to-end delay, loss rate, throughput, and jitter using the Network Simulator 2 (NS2) and both 802.11 and 802.11b protocols. The results show that AODV generally outperforms AntHocNet across the metrics, having lower delay, higher throughput and packet delivery at various data rates. However, AntHocNet's performance improves relative to AODV at higher data rates and numbers of nodes.
IMPLEMENTATION OF BIOLOGICAL ROUTING PROTOCOL IN TUNNEL WIRELESS SENSOR NETWO...ijwmn
The document describes a new biological routing protocol called Biological Tunnel Routing Protocol (BioTROP) for Tunnel Wireless Sensor Networks (TWSN). BioTROP uses concepts from ant colony behavior and optimal forwarding calculations to determine the best next hop neighbor for packet transmission. It was tested on a 7 node TelosB sensor network in a tunnel, where over 70% of transmitted data packets were successfully delivered to the base station. BioTROP employs a cross-layer design between the physical and network layers to select next hops based on metrics like signal strength, link quality, and remaining power from the physical layer. It consists of routing management and neighborhood management modules to determine optimal routes and maintain neighbor tables.
PERFORMANCE ANALYSIS OF OLSR PROTOCOL IN MANET CONSIDERING DIFFERENT MOBILITY...ijwmn
A Mobile Ad Hoc Network (MANET) is created when an independent mobile node network is connected
dynamically via wireless links. MANET is a self-organizing network that does not rely on pre-existing
infrastructure such as wired or wireless network routers. Mobile nodes in this network move randomly,
thus, the topology is always changing. Routing protocols in MANET are critical in ensuring dependable
and consistent connectivity between the mobile nodes. They conclude logically based on the interaction
between mobile nodes in MANET routing and encourage them to choose the optimum path between source
and destination. Routing protocols are classified as proactive, reactive, or hybrid. The focus of this project
will be on Optimized Link State Routing (OLSR) protocol, a proactive routing technique. OLSR is known as
the optimized variant of link state routing in which packets are sent throughout the network using the
multipoint relay (MPR) mechanism. This article evaluates the performance of the OLSR routing protocol
under condition of changing mobility speed and network density. The study's performance indicators are
average packet throughput, packet delivery ratio (PDR), and average packet latency. Network Simulator 2
(NS-2) and an external patch UM-OLSR are used to simulate and evaluate the performance of such
protocol. As a result of research, the approach of implementing the MPR mechanism are able to minimise
redundant data transmission during the normal message broadcast. The MPRs enhance the link state
protocols’ traditional diffusion mechanism by selecting the right MPRs. Hence, the number of undesired
broadcasts can be reduced and limited. Further research will focus on different scenario and environment
using different mobility model
MANET Routing Protocols , a case studyRehan Hattab
L. Yi, Y. Zhai, Y. Wang, J. Yuan and I. You , Impacts of Internal Network Contexts on Performance of MANET Routing Protocols: a Case Study, Sixth International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing,2012.
This document summarizes a research paper that proposes a new Position Based Opportunistic Routing Protocol (POR) to improve reliable data delivery in mobile ad hoc networks. Existing geographic routing protocols have issues with route failures and delays in discovering new routes when nodes move. The proposed POR protocol selects multiple forwarding candidate nodes to opportunistically forward packets. If the primary forwarder fails, backup candidates can forward packets to avoid transmission interruptions. Simulation results show the POR protocol has lower delay and higher packet delivery ratio compared to existing protocols.
Performance improvement of vehicular delay tolerant networks using public tra...ijmnct
In some networks, communications are sometimes interrupted and packet sending encounters many delays
due to lack of permanent connection between the nodes. Inter-vehicular and inter-satellite networks, which
are the so-called delay-tolerant networks, are an example to this type. This paper proposed a new routing
algorithm, which could increase efficiency of this kind of networks using predictability feature of bus
movement in a vehicular network. In this paper, bus routes were considered the backbone for vehicular
network and, knowing route of bus and destination of packets, the proposed algorithm, which was able to
use this information, was introduced. In addition, the proposed algorithm was simulated to prove its
efficiency and then it was compared with other algorithms in different conditions. The obtained results
indicated acceptable efficiency of the proposed algorithm.
Performance Comparison of Different Mobility Model on Topology Managed MANETEswar Publications
A wireless ad hoc network is a sovereign system in which users can communicate with each other freely. It can be deployed rapidly at a very low cost, and can be easily managed and extended. Topology management has main objective to maintain a topology connectivity that improves wireless network performance by minimizing energy consumption. Also Topology control with cooperative communication was recently research initiated .Cooperative Communication (CC) is a technique that allows no. of nodes to simultaneously transmit the same data. It can save power and extend transmission coverage. Topology management with cooperative communication is new research
initiated in the field of Mobile Ad-hoc Network. In this paper, we analyze the effect of multi-traffic on the topology managed MANET. We implemented some applications on different mobility models that is OLSR move and random mobility. To simulate all scenario OPNET 14.5 software is used. OPNET is a comprehensive suite of tools for modelling large wired and wireless networks. It uses simulation and emulation to predict the behaviour and performance of networks to improve their design, operation and management.
In the first part of paper, implemented the existed network on the OPNET simulator and evaluate the performance (Download Response Time, Traffic Send and Traffic Receive) of OLSR move based topology control network.
In the second part of paper, evaluated the QoS performanc (Delay, Download Response Time, Traffic Send and Receive Response) of Random Mobility based topology control network. From the simulation results we observed that compare with OLSR move models, the Random mobility model performance is good. We implemented different traffic pattern on two Topology managed MANET.
In the third part of paper, implemented the dynamic traffic pattern like Email, FTP & Voice and video conferencing on the proposed network. Simulation results show that FTP and E-mail both have large download response time in case of OLSR move model rather than Random Mobility model. Traffic send and receive performance of email is good in OLSR-move model. Video Conferencing has good response of traffic send and receive in Random Mobility model.
Performance Analysis of Ad-hoc on Demand Distance Vector Routing (AODV) and D...ijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Improved routing scheme with ACO in WSN in comparison to DSDVijsrd.com
Routing is the process of selecting best paths in a network in terms of energy and distance. In adhoc it is critical to collect the information in an efficient manner as it has limitations in terms of centralized congestion. In such case to perform the effective communication there is the requirement of some such routing approach that can provide the routing with optimized path. In this work, ACO based routing approach is defined to generate the optimized path in comparison to DSDV over the network. The presented approach is implemented in matlab environment and obtained results shows the effective results in terms of optimized path.
Joint Routing and Congestion Control in Multipath Channel based on Signal to ...IJECEIAES
Routing protocol and congestion control in Transmission Control Protocol (TCP) have important roles in wireless mobile network performance. In wireless communication, the stability of the path and successful data transmission will be influenced by the channel condition. This channel condition constraints come from path loss and the multipath channel fading. With these constraints, the algorithm in the routing protocol and congestion control is confronted with the uncertainty of connection quality and probability of successful packet transmission, respectively. It is important to investigate the reliability and robustness of routing protocol and congestion control algorithms in dealing with such situation. In this paper, we develop a detailed approach and analytical throughput performance with a cross layer scheme (CLS) between routing and congestion control mechanism based on signal to noise ratio (SNR) in Rician and Rayleigh as multipath fading channel. We proposed joint routing and congestion control TCP with a cross layer scheme model based on SNR (RTCP-SNR). We compare the performance of RTCP-SNR with conventional routing-TCP and routing-TCP that used CLS with routing aware (RTCP-RA) model. The analyses and the simulation results showed that RTCP-SNR in a multipath channel outperforms conventional routing-TCP and RTCP-RA.
Efficient Routing Protocol in the Mobile Ad-hoc Network (MANET) by using Gene...IOSR Journals
This document discusses using a genetic algorithm to improve routing in mobile ad hoc networks. It begins with background on mobile ad hoc networks and common routing protocols. It then introduces genetic algorithms and how they work by simulating natural evolution. The document proposes using a genetic algorithm with the AODV routing protocol to find optimal paths between source and destination nodes. It describes implementing this approach and comparing its performance to traditional AODV routing. The results showed the genetic algorithm approach performed better in terms of quality of service and throughput.
Consistent Data Release in MANET Using Light Weight Verification Algorithm wi...IJCERT
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IJCERT (ISSN 2349–7084 (Online)) is approved by National Science Library (NSL), National Institute of Science Communication And Information Resources (NISCAIR), Council of Scientific and Industrial Research, New Delhi, India.
The document proposes a full-duplex cognitive MAC (FDC-MAC) protocol for cognitive radio networks. The protocol consists of two stages: (1) a FD sensing stage where secondary users perform concurrent spectrum sensing and transmission at a controlled power level to mitigate self-interference, and (2) a transmission stage where secondary users transmit at maximum power if the sensing stage indicated an available channel. The document develops a mathematical model to analyze the throughput performance of the FDC-MAC protocol and proves that there exists an optimal sensing time and transmit power configuration to maximize throughput. Extensive simulation results demonstrate significant throughput gains of the FDC-MAC protocol over half-duplex and single-stage full-duplex MAC protocols.
INVESTIGATING MULTILAYER OMEGA-TYPE NETWORKS OPERATING WITH THE CUT-THROUGH T...IJCNCJournal
The continuous increase in the complexity of data networks has motivated the development of more effective Multistage Interconnection Networks (MINs) as important factors in providing higher data transfer rates in various switching divisions. In this paper, semi-layer omega-class networks operating with a cut-through forwarding technique are chosen as test-bed subjects for detailed evaluation, and this network architecture is modelled, inspected, and simulated. The results are examined for relevant singlelayer omega networks operating with cut-through or ‘store and forward’ forwarding techniques. Two series of experiments are carried out: one concerns the case of uniform traffic, while the other is related to hotspot traffic. The results quantify the way in which this network outperforms the corresponding singlelayer network architectures for the same network size and buffer size. Furthermore, the effects of the dimensions of the switch elements and their corresponding reliability on the overall interconnection system are investigated, and the complexity and the relevant cost are examined. The data yielded by this investigation can be valuable to MIN engineers and can allow them to achieve more productive networks with lower overall implementation costs.
This document proposes a new fuzzy logic-based routing protocol for mobile ad-hoc networks (MANETs) that considers path stability, residual energy of nodes, and bandwidth for optimal path selection at the source node. It also proposes adjusting the transmission rate at the source node based on end-to-end delay and packet loss ratio measured at the destination node. This cross-layer approach uses two fuzzy logic systems - one for path selection based on stability and bandwidth, and another for transmission rate adjustment based on delay and packet loss. The goal is to select stable paths and prevent congestion for more efficient data transmission in MANETs.
Improve MANET network performance using ESPS approachSurbhi Sharma
The document presents a paper on an Efficient Stable Path Selection Approach (ESPS) for improved network performance in mobile ad hoc networks. The paper proposes a new routing protocol called MCCP that uses an ant colony optimization algorithm to select the most stable path for communication between nodes. The methodology involves assumptions about the network, assigning parameters like mobility, signal strength, and node degree, and using an ACO algorithm to optimize path selection. The approach is implemented using the NS2 simulator and results show that MCCP improves performance metrics like packet delivery ratio, end-to-end delay, and throughput compared to the AOMDV routing protocol. The paper concludes that ESPS achieves more efficient and effective data transmission through stable path selection
Mobile environment pretense a number of novel
theoretical and optimization issues such as position, operation
and following in that a lot of requests rely on them for
desirable information. The precedent works are sprinkled
across the entire network layer: from the medium of physical
to link layer to routing and then application layer. In this
invention, we present outline solutions in Medium Access
Control (MAC), data distribution, coverage resolve issues
under mobile ad-hoc network environment based on
congestion control technique using Transmission Control
Protocol (TCP). In mobile ad-hoc network issues can arise
such as link disconnections, channel contention and recurrent
path loss. To resolve this issue, we propose a Cross Layer
based Hybrid fuzzy ad-hoc rate based Congestion Control
(CLHCC) approach to maximize network performance. Based
on the destination report it regulates the speed of data flow to
control data loss by monitoring the present network status
and transmits this report to the source as advice. The source
adjusts the sending flow rate as per the advice. This is
monitored by channel usage, ultimate delay, short term
throughput.
Tree Based Proactive Source Routing Protocol for MANETspaperpublications3
bstract: A mobile adhoc network (MANET) is a wireless communication network and the node that does not lie within the direct transmission range of each other depends on the intermediate nodes to forward data. Opportunistic data forwarding has not been widely utilized in mobile adhoc networks (MANETs) and the main reason is the lack of an efficient lightweight proactive routing scheme with strong source routing capability. PSR protocol facilitates opportunistic data forwarding in MANETs. In PSR, each node maintains a breadth-first search spanning tree of the network rooted at it-self. This information is periodically exchanged among neighboring nodes for updated network topology information. Here added a Mobile sink to reduce the overhead in case of number of child node increases and also to reduce the delay.
This document discusses a computational fluid dynamics (CFD) analysis of a shell and tube heat exchanger with different baffle inclinations. The study aims to determine the optimal baffle inclination angle and mass flow rate. It analyzes heat transfer characteristics for baffle inclinations of 0, 10 and 20 degrees. The results indicate that a helical baffle configuration forces fluid rotation, increasing heat transfer rates and coefficients more than a segmental baffle design. Overall, the CFD simulation allows determination of outlet temperatures, pressure drops, and optimal design parameters for improved heat exchanger performance.
The document reviews different secured routing protocols for mobile ad hoc networks and their vulnerabilities. It discusses three main categories of secured routing protocols:
1. Trust oriented protocols which use node trust values to determine routing, but are still vulnerable to malicious nodes gaining control.
2. Incentive oriented protocols which aim to discourage attacks through incentives like credits, but require online access or tamper-proof hardware.
3. Detection and isolation protocols which identify misbehaving nodes but have issues like high overhead, inability to detect certain attacks, and vulnerability to false accusations.
In conclusion, while existing protocols address some attacks, they remain vulnerable or impractical in many cases. A robust, lightweight approach is still needed to
C OMPARISON OF AODV AND ANTHOCNET IN S TATIC W IRELESS N ETWORKIJCI JOURNAL
This document compares the performance of the AODV and AntHocNet routing protocols in static wireless networks. It presents simulation results for packet delivery ratio, end-to-end delay, loss rate, throughput, and jitter using the Network Simulator 2 (NS2) and both 802.11 and 802.11b protocols. The results show that AODV generally outperforms AntHocNet across the metrics, having lower delay, higher throughput and packet delivery at various data rates. However, AntHocNet's performance improves relative to AODV at higher data rates and numbers of nodes.
IMPLEMENTATION OF BIOLOGICAL ROUTING PROTOCOL IN TUNNEL WIRELESS SENSOR NETWO...ijwmn
The document describes a new biological routing protocol called Biological Tunnel Routing Protocol (BioTROP) for Tunnel Wireless Sensor Networks (TWSN). BioTROP uses concepts from ant colony behavior and optimal forwarding calculations to determine the best next hop neighbor for packet transmission. It was tested on a 7 node TelosB sensor network in a tunnel, where over 70% of transmitted data packets were successfully delivered to the base station. BioTROP employs a cross-layer design between the physical and network layers to select next hops based on metrics like signal strength, link quality, and remaining power from the physical layer. It consists of routing management and neighborhood management modules to determine optimal routes and maintain neighbor tables.
PERFORMANCE ANALYSIS OF OLSR PROTOCOL IN MANET CONSIDERING DIFFERENT MOBILITY...ijwmn
A Mobile Ad Hoc Network (MANET) is created when an independent mobile node network is connected
dynamically via wireless links. MANET is a self-organizing network that does not rely on pre-existing
infrastructure such as wired or wireless network routers. Mobile nodes in this network move randomly,
thus, the topology is always changing. Routing protocols in MANET are critical in ensuring dependable
and consistent connectivity between the mobile nodes. They conclude logically based on the interaction
between mobile nodes in MANET routing and encourage them to choose the optimum path between source
and destination. Routing protocols are classified as proactive, reactive, or hybrid. The focus of this project
will be on Optimized Link State Routing (OLSR) protocol, a proactive routing technique. OLSR is known as
the optimized variant of link state routing in which packets are sent throughout the network using the
multipoint relay (MPR) mechanism. This article evaluates the performance of the OLSR routing protocol
under condition of changing mobility speed and network density. The study's performance indicators are
average packet throughput, packet delivery ratio (PDR), and average packet latency. Network Simulator 2
(NS-2) and an external patch UM-OLSR are used to simulate and evaluate the performance of such
protocol. As a result of research, the approach of implementing the MPR mechanism are able to minimise
redundant data transmission during the normal message broadcast. The MPRs enhance the link state
protocols’ traditional diffusion mechanism by selecting the right MPRs. Hence, the number of undesired
broadcasts can be reduced and limited. Further research will focus on different scenario and environment
using different mobility model
MANET Routing Protocols , a case studyRehan Hattab
L. Yi, Y. Zhai, Y. Wang, J. Yuan and I. You , Impacts of Internal Network Contexts on Performance of MANET Routing Protocols: a Case Study, Sixth International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing,2012.
This document summarizes a research paper that proposes a new Position Based Opportunistic Routing Protocol (POR) to improve reliable data delivery in mobile ad hoc networks. Existing geographic routing protocols have issues with route failures and delays in discovering new routes when nodes move. The proposed POR protocol selects multiple forwarding candidate nodes to opportunistically forward packets. If the primary forwarder fails, backup candidates can forward packets to avoid transmission interruptions. Simulation results show the POR protocol has lower delay and higher packet delivery ratio compared to existing protocols.
Performance improvement of vehicular delay tolerant networks using public tra...ijmnct
In some networks, communications are sometimes interrupted and packet sending encounters many delays
due to lack of permanent connection between the nodes. Inter-vehicular and inter-satellite networks, which
are the so-called delay-tolerant networks, are an example to this type. This paper proposed a new routing
algorithm, which could increase efficiency of this kind of networks using predictability feature of bus
movement in a vehicular network. In this paper, bus routes were considered the backbone for vehicular
network and, knowing route of bus and destination of packets, the proposed algorithm, which was able to
use this information, was introduced. In addition, the proposed algorithm was simulated to prove its
efficiency and then it was compared with other algorithms in different conditions. The obtained results
indicated acceptable efficiency of the proposed algorithm.
Performance Comparison of Different Mobility Model on Topology Managed MANETEswar Publications
A wireless ad hoc network is a sovereign system in which users can communicate with each other freely. It can be deployed rapidly at a very low cost, and can be easily managed and extended. Topology management has main objective to maintain a topology connectivity that improves wireless network performance by minimizing energy consumption. Also Topology control with cooperative communication was recently research initiated .Cooperative Communication (CC) is a technique that allows no. of nodes to simultaneously transmit the same data. It can save power and extend transmission coverage. Topology management with cooperative communication is new research
initiated in the field of Mobile Ad-hoc Network. In this paper, we analyze the effect of multi-traffic on the topology managed MANET. We implemented some applications on different mobility models that is OLSR move and random mobility. To simulate all scenario OPNET 14.5 software is used. OPNET is a comprehensive suite of tools for modelling large wired and wireless networks. It uses simulation and emulation to predict the behaviour and performance of networks to improve their design, operation and management.
In the first part of paper, implemented the existed network on the OPNET simulator and evaluate the performance (Download Response Time, Traffic Send and Traffic Receive) of OLSR move based topology control network.
In the second part of paper, evaluated the QoS performanc (Delay, Download Response Time, Traffic Send and Receive Response) of Random Mobility based topology control network. From the simulation results we observed that compare with OLSR move models, the Random mobility model performance is good. We implemented different traffic pattern on two Topology managed MANET.
In the third part of paper, implemented the dynamic traffic pattern like Email, FTP & Voice and video conferencing on the proposed network. Simulation results show that FTP and E-mail both have large download response time in case of OLSR move model rather than Random Mobility model. Traffic send and receive performance of email is good in OLSR-move model. Video Conferencing has good response of traffic send and receive in Random Mobility model.
Performance Analysis of Ad-hoc on Demand Distance Vector Routing (AODV) and D...ijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Improved routing scheme with ACO in WSN in comparison to DSDVijsrd.com
Routing is the process of selecting best paths in a network in terms of energy and distance. In adhoc it is critical to collect the information in an efficient manner as it has limitations in terms of centralized congestion. In such case to perform the effective communication there is the requirement of some such routing approach that can provide the routing with optimized path. In this work, ACO based routing approach is defined to generate the optimized path in comparison to DSDV over the network. The presented approach is implemented in matlab environment and obtained results shows the effective results in terms of optimized path.
Joint Routing and Congestion Control in Multipath Channel based on Signal to ...IJECEIAES
Routing protocol and congestion control in Transmission Control Protocol (TCP) have important roles in wireless mobile network performance. In wireless communication, the stability of the path and successful data transmission will be influenced by the channel condition. This channel condition constraints come from path loss and the multipath channel fading. With these constraints, the algorithm in the routing protocol and congestion control is confronted with the uncertainty of connection quality and probability of successful packet transmission, respectively. It is important to investigate the reliability and robustness of routing protocol and congestion control algorithms in dealing with such situation. In this paper, we develop a detailed approach and analytical throughput performance with a cross layer scheme (CLS) between routing and congestion control mechanism based on signal to noise ratio (SNR) in Rician and Rayleigh as multipath fading channel. We proposed joint routing and congestion control TCP with a cross layer scheme model based on SNR (RTCP-SNR). We compare the performance of RTCP-SNR with conventional routing-TCP and routing-TCP that used CLS with routing aware (RTCP-RA) model. The analyses and the simulation results showed that RTCP-SNR in a multipath channel outperforms conventional routing-TCP and RTCP-RA.
Efficient Routing Protocol in the Mobile Ad-hoc Network (MANET) by using Gene...IOSR Journals
This document discusses using a genetic algorithm to improve routing in mobile ad hoc networks. It begins with background on mobile ad hoc networks and common routing protocols. It then introduces genetic algorithms and how they work by simulating natural evolution. The document proposes using a genetic algorithm with the AODV routing protocol to find optimal paths between source and destination nodes. It describes implementing this approach and comparing its performance to traditional AODV routing. The results showed the genetic algorithm approach performed better in terms of quality of service and throughput.
Consistent Data Release in MANET Using Light Weight Verification Algorithm wi...IJCERT
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The document proposes a full-duplex cognitive MAC (FDC-MAC) protocol for cognitive radio networks. The protocol consists of two stages: (1) a FD sensing stage where secondary users perform concurrent spectrum sensing and transmission at a controlled power level to mitigate self-interference, and (2) a transmission stage where secondary users transmit at maximum power if the sensing stage indicated an available channel. The document develops a mathematical model to analyze the throughput performance of the FDC-MAC protocol and proves that there exists an optimal sensing time and transmit power configuration to maximize throughput. Extensive simulation results demonstrate significant throughput gains of the FDC-MAC protocol over half-duplex and single-stage full-duplex MAC protocols.
INVESTIGATING MULTILAYER OMEGA-TYPE NETWORKS OPERATING WITH THE CUT-THROUGH T...IJCNCJournal
The continuous increase in the complexity of data networks has motivated the development of more effective Multistage Interconnection Networks (MINs) as important factors in providing higher data transfer rates in various switching divisions. In this paper, semi-layer omega-class networks operating with a cut-through forwarding technique are chosen as test-bed subjects for detailed evaluation, and this network architecture is modelled, inspected, and simulated. The results are examined for relevant singlelayer omega networks operating with cut-through or ‘store and forward’ forwarding techniques. Two series of experiments are carried out: one concerns the case of uniform traffic, while the other is related to hotspot traffic. The results quantify the way in which this network outperforms the corresponding singlelayer network architectures for the same network size and buffer size. Furthermore, the effects of the dimensions of the switch elements and their corresponding reliability on the overall interconnection system are investigated, and the complexity and the relevant cost are examined. The data yielded by this investigation can be valuable to MIN engineers and can allow them to achieve more productive networks with lower overall implementation costs.
This document proposes a new fuzzy logic-based routing protocol for mobile ad-hoc networks (MANETs) that considers path stability, residual energy of nodes, and bandwidth for optimal path selection at the source node. It also proposes adjusting the transmission rate at the source node based on end-to-end delay and packet loss ratio measured at the destination node. This cross-layer approach uses two fuzzy logic systems - one for path selection based on stability and bandwidth, and another for transmission rate adjustment based on delay and packet loss. The goal is to select stable paths and prevent congestion for more efficient data transmission in MANETs.
Improve MANET network performance using ESPS approachSurbhi Sharma
The document presents a paper on an Efficient Stable Path Selection Approach (ESPS) for improved network performance in mobile ad hoc networks. The paper proposes a new routing protocol called MCCP that uses an ant colony optimization algorithm to select the most stable path for communication between nodes. The methodology involves assumptions about the network, assigning parameters like mobility, signal strength, and node degree, and using an ACO algorithm to optimize path selection. The approach is implemented using the NS2 simulator and results show that MCCP improves performance metrics like packet delivery ratio, end-to-end delay, and throughput compared to the AOMDV routing protocol. The paper concludes that ESPS achieves more efficient and effective data transmission through stable path selection
Mobile environment pretense a number of novel
theoretical and optimization issues such as position, operation
and following in that a lot of requests rely on them for
desirable information. The precedent works are sprinkled
across the entire network layer: from the medium of physical
to link layer to routing and then application layer. In this
invention, we present outline solutions in Medium Access
Control (MAC), data distribution, coverage resolve issues
under mobile ad-hoc network environment based on
congestion control technique using Transmission Control
Protocol (TCP). In mobile ad-hoc network issues can arise
such as link disconnections, channel contention and recurrent
path loss. To resolve this issue, we propose a Cross Layer
based Hybrid fuzzy ad-hoc rate based Congestion Control
(CLHCC) approach to maximize network performance. Based
on the destination report it regulates the speed of data flow to
control data loss by monitoring the present network status
and transmits this report to the source as advice. The source
adjusts the sending flow rate as per the advice. This is
monitored by channel usage, ultimate delay, short term
throughput.
Tree Based Proactive Source Routing Protocol for MANETspaperpublications3
bstract: A mobile adhoc network (MANET) is a wireless communication network and the node that does not lie within the direct transmission range of each other depends on the intermediate nodes to forward data. Opportunistic data forwarding has not been widely utilized in mobile adhoc networks (MANETs) and the main reason is the lack of an efficient lightweight proactive routing scheme with strong source routing capability. PSR protocol facilitates opportunistic data forwarding in MANETs. In PSR, each node maintains a breadth-first search spanning tree of the network rooted at it-self. This information is periodically exchanged among neighboring nodes for updated network topology information. Here added a Mobile sink to reduce the overhead in case of number of child node increases and also to reduce the delay.
This document discusses a computational fluid dynamics (CFD) analysis of a shell and tube heat exchanger with different baffle inclinations. The study aims to determine the optimal baffle inclination angle and mass flow rate. It analyzes heat transfer characteristics for baffle inclinations of 0, 10 and 20 degrees. The results indicate that a helical baffle configuration forces fluid rotation, increasing heat transfer rates and coefficients more than a segmental baffle design. Overall, the CFD simulation allows determination of outlet temperatures, pressure drops, and optimal design parameters for improved heat exchanger performance.
This document summarizes research on evaluating WiMAX network performance using vertical handoff. It describes the setup used, which includes 8 base stations to test handoff as a mobile station moves between cells. Graphs show the mobile station's throughput drops slightly during handoff, with maximum delay of 0.025 seconds. Vertical handoff between WiMAX and WLAN networks is also tested, with the document observing a smooth handoff between the networks as the mobile nodes move between their coverage areas.
This document summarizes a research paper that designed and implemented sphere decoding (SD) for multiple-input multiple-output (MIMO) systems using an FPGA. It used Newton's iterative method to calculate the matrix inverse as part of the SD algorithm, which reduces complexity compared to direct matrix inversion. The authors implemented SD for a 2x2 MIMO system with 4-QAM modulation. Simulation results showed that Newton's method converged after 7 iterations, and SD successfully calculated the minimum Euclidean distance vector.
This document describes the design and implementation of a printed rectangular monopole antenna for wireless networks. It aims to create a broadband antenna for frequencies like Bluetooth, Wi-Fi, and WiMAX between 2.4-2.4835 GHz. The antenna is printed on a PCB with a rectangular patch and ground plane. It is fed using a microstrip line. The design achieves a bandwidth of 4.1-4.26 GHz through optimization of parameters like patch size and feed length. Both software simulation and hardware implementation are conducted, with the hardware results showing slightly reduced bandwidth compared to simulation. The antenna demonstrates good performance for broadband wireless applications.
This document summarizes a study on using a fuzzy total margin based support vector machine (FTM-SVM) approach to handle class imbalance in machine learning classification problems. It discusses how traditional SVM classifiers can overfit to the majority class in imbalanced data sets. The proposed FTM-SVM method aims to address this issue by incorporating a total margin algorithm, different cost functions, and fuzzy membership functions to reduce the effect of outliers and noise on the minority class. The paper evaluates the FTM-SVM approach on artificial and imbalanced data sets, finding it achieves higher performance measures than some existing class imbalance learning methods.
This document discusses improving data security for mobile devices using cloud computing storage. It proposes encrypting data stored in the cloud to address security issues. Mobile cloud computing integrates mobile networks and cloud computing to provide services for mobile users. However, storing large amounts of personal and enterprise data in the cloud raises security risks regarding data integrity, authentication, and access. The document reviews these risks and considers solutions like encryption and digital rights management to protect data stored in the cloud.
1. ICT (information and communication technologies) have transformed education by facilitating access to information, communication, and new modes of learning. The internet and mobile technologies have expanded opportunities for online, blended, and mobile learning.
2. Students now need digital literacy skills to effectively search, evaluate, and utilize the vast amount of online information. Key 21st century skills identified include digital literacy, inventive thinking, effective communication, and high productivity.
3. ICT have impacted teaching by shifting teachers' roles from knowledge transmitters to learning facilitators. They have also changed student roles from passive recipients to active participants in collaborative learning. Technologies like interactive whiteboards enhance interactive learning.
This document analyzes the performance of a diesel engine fueled with blends of biodiesel derived from Cashew Nut Shell Liquid (CNSL) and ethanol. Experiments were conducted with diesel and blends containing 10%, 15%, 20% CNSL, as well as blends with 5% and 10% ethanol added to the 15% CNSL blend. Performance parameters like brake thermal efficiency, fuel consumption, emissions were measured and compared across fuel blends and to diesel. Results showed the 15% CNSL blend performed better than other blends, while adding ethanol reduced performance due to its lower energy content. This research evaluates CNSL biodiesel and its blends as potential alternatives to conventional diesel
This document summarizes a research paper that proposes a hybrid evolutionary clustering approach for optimized routing in mobile ad hoc networks. It uses particle swarm optimization (PSO) and ant colony optimization (ACO) to perform spatial clustering of nodes. Greedy routing is then used to find routes, and when dead ends are encountered, genetic algorithms are applied to find alternative routes. The approach aims to improve greedy routing performance and recovery from dead ends by avoiding the use of floating nodes. Simulation results showed improved greedy routing and fewer concave nodes compared to other methods.
This document discusses the use of an adaptive decision feedback equalizer (ADFE) to mitigate pulse dispersion in optical communication channels. It begins by describing different sources of dispersion in optical fibers. Then it proposes using a fractional spaced decision feedback equalizer (FSDFE) integrated with activity detection guidance (ADG) and tap decoupling (TD) to improve performance. Simulation results show the FSDFE can estimate the channel impulse response and minimize differences between the input and output. Adding ADG and TD further improves convergence rate, detection of inactive taps, and asymptotic performance. The ADFE is an effective technique for equalization and mitigating dispersion in optical links.
This document summarizes a study that used casting simulation software to model and optimize the sand casting process for a steel flywheel. The researchers first modeled the flywheel component along with gating and risering systems. Simulation of the initial model revealed shrinkage defects. The model was modified by changing the ingate locations and adding risers, which directionally solidified the casting. The modified model was then simulated using ADSTEFAN software to analyze fluid flow, solidification patterns, and potential defects like shrinkage and porosity. The simulation results helped optimize the casting design to improve quality and yield.
This document summarizes a study on a biomethanation plant that converts vegetable waste into biogas. Some key points:
- The plant uses a BIMA digester to break down vegetable waste from markets into biogas through anaerobic digestion.
- The process involves shredding the waste, digestion in the BIMA digester to produce biogas, collection of biogas, power generation from the biogas, dewatering of the digested substrate, and odor control.
- The byproduct of digestion (biodigested slurry) is a valuable organic manure high in nutrients that can be used to enrich soils or as fertilizer.
The document discusses using support vector machines (SVM) and various lexical, semantic, and syntactic features for question classification. It aims to develop a state-of-the-art machine learning based question classifier. Various features are discussed, including lexical features like n-grams and stemming, syntactic features like question headwords, and semantic features derived from named entity recognition, WordNet senses, and semantic word lists. SVM is used as the classifier to take advantage of its good performance for text classification tasks. The results show that combining these feature types can achieve accurate question classification.
This document summarizes research on topology control techniques in wireless sensor networks. It first discusses how topology control aims to reduce energy consumption while maintaining network connectivity by regulating nodes' transmission power. It then reviews several existing topology control algorithms proposed in other papers. These algorithms distribute transmission power control to maximize network lifetime. Finally, the document concludes that many topology control algorithms have been developed to achieve energy efficient routing, but implementing them on real-world testbeds poses challenges.
This document presents a performance analysis of an XML to HTML converter. It describes creating a converter that takes XML files with predefined tags as input and generates equivalent HTML files. This is done to reduce the response time of web pages compared to using ASP.NET server controls, which have a large lifecycle. Two test websites were created, one with the converter and one with ASP.NET controls, and response time graphs and aggregate graphs from testing show that the website using the XML converter performed much better with lower response times.
The document compares the design of circular and square water tanks using the working stress method and limit state method. It was found that:
1) The limit state method requires less steel than the working stress method for both circular and square tank designs.
2) A circular tank design is more economical than a square tank design due to requiring less steel.
3) The limit state method results in a more rational and economical design compared to the traditional working stress method.
This document summarizes a study on the foreign exchange exposure of Indian corporate firms from 2009 to 2013. The study estimated foreign exchange exposure using ordinary least squares regression with various trade-weighted exchange rate indices. Key findings include:
1) Foreign exchange exposure was estimated for a sample of 27 non-financial Indian firms using different exchange rate indices.
2) Exposure was measured as the sensitivity of stock returns to changes in exchange rates based on the model developed by Adler and Dumas.
3) Preliminary results found Indian firms may benefit from appreciation of the home currency and lose from depreciation, but overall exposure was weakly significant.
This study examined the tensile behavior of ferrocement composite panels with varying numbers of wire mesh layers and inclusion of steel fibers. 36 panels were cast and tested under direct tension. Panels were divided into groups based on number of mesh layers (1 to 6 layers) and use of steel fibers. Testing found that ultimate load, elongation and tensile strength increased with additional mesh layers due to higher reinforcement volume fraction. Panels with steel fibers exhibited 10-17% higher strength than non-fiber panels. Failure occurred through cracking perpendicular to the load direction. The study concluded that ferrocement properties directly correlate to the number of reinforcing mesh layers.
This document describes the design and implementation of a printed monopole antenna for use in the 2.4-2.4835 GHz Industrial Scientific and Medical (ISM) band. It begins with an introduction to wireless communications in the ISM band and the challenges of developing small, low-cost integrated antennas for these applications. It then outlines the methodology for antenna design which includes calculating dimensions, simulation, observation, and hardware implementation. The design specification and steps taken to design the rectangular microstrip patch antenna are provided, including choosing parameters like resonant frequency, dielectric material, and substrate height. Simulation results for parameters like radiation pattern and bandwidth are analyzed. The document concludes that printed monopole antennas are well-suited for ISM band applications
Performance Evaluation of Artificial Ant Colony using Zone Based Routing Appr...IRJET Journal
This document discusses performance evaluation of an artificial ant colony routing approach called AntNet for mobile ad hoc networks (MANETs). It begins with an introduction to AntNet, which uses "artificial ants" that travel through the network collecting traffic information to direct data packets towards their destination. The document then summarizes zone-based routing protocols and compares AntNet to other ant colony optimization routing algorithms. It evaluates the performance of AntNet using different zone sizes and routing approaches through simulation experiments. Key metrics like packet delivery ratio and end-to-end delay are compared between AntNet and traditional routing protocols.
Routing Enhancement of MANETs using Hybrid Protocol Combined with PBOIJERA Editor
Mobile ad hoc Networks (MANETs) show an astonishing qualities in the concept of networks which are used without wires. MANETs experience numerous communication medium restrictions such as constrained storage of memory and development of effectual routing protocols. Furthermore, multihop routing mechanism employed in MANETs gives rise to the contention in the channel and jamming within the network. This limits the effectiveness of the network which reduces the energy efficiency of the network and also lessens the routing performance of MANETs. Hence, the major matter in MANETs is to minimize the congestion and contention in order to enhance the routing mechanism. Hence, in this paper, a novel protocol is put into practice having an enhanced route discovery mechanism which is implemented in order to avoid the congestion during the routing. The proposed protocol chooses the route for the transference of information on the basis of load within the traffic on the node and then resets the route with the change in topology. The protocol is then integrated with the proposed algorithm Pollination Based Optimization (PBO) algorithm. This is an efficient technique for transmission that requires a link for longer period of time. The simulator used for the simulation of the work is Network Simulator-2 (NS-2). Simulation results have been carried out showing that the route optimization and enhancement in the route discovery using Pollination Based Optimization (PBO) algorithm.
T HE I MPACT OF TCP C ONGESTION W INDOW S IZE ON THE P ERFORMANCE E VA...ijwmn
A mobile ad hoc network (MANET) is a temporary coll
ection of mobile nodes randomly moved within a
limited terrain area. The nodes are connected to fo
rm a wireless network without use any communication
infrastructure. Because of the limiting resources o
f MANET nodes, multiple hops
scheme is proposed for
data exchange
across the network. Varieties of mobile ad hoc rout
ing protocols have been developed to
support the multi-hop scheme of ad hoc networks. A
popular Transmission Control Protocol (TCP)
provides a reliable connection in a computer networ
k environment; it sets its congestion window size i
n
response to the behavior of the network to achieve
the best performance. This work aims to investigate
and
compare the MANET protocol
performance, such as DSDV, AODV and DSR in terms of
network
throughput, average routing load, the packet delive
ry ratio (PDR), and average end-to-end delay by
varying the maximum congestion window size. Our si
mulation has been implemented using a well-known
NS-2.35 network simulator. The simulated results sh
ow that the demonstrates of the concepts of MANET
routing protocols with respect to TCP congestion wi
ndow size in MANET environment
PERFORMANCE ANALYSIS OF ANTHOCNET ROUTING PROTOCOL FOR HYBRID AD HOC NETWORKKhushbooGupta145
This document summarizes a research paper that analyzes the performance of the AntHocNet routing protocol for hybrid ad hoc networks. AntHocNet is a bio-inspired routing protocol based on ant colony optimization. It is an adaptive hybrid algorithm that combines reactive and proactive routing. The document provides background on mobile ad hoc networks and routing protocols. It describes how AntHocNet works, comparing it to other routing protocols like AODV and DSR. The paper then discusses the network simulation setup used to evaluate and compare the performance of AntHocNet, AODV and DSR based on metrics like packet delivery ratio, end-to-end delay, and throughput. The simulation was conducted in NS2 with
This document describes a study that designed and implemented a Mobile AntNet routing algorithm for mobile ad hoc networks based on the original AntNet algorithm. The researchers used the NS-2 simulator to model the Mobile AntNet algorithm and compare its performance to other routing protocols. Simulation results showed that the Mobile AntNet algorithm performed well in terms of throughput, packet loss, and ability to handle node failures in the mobile ad hoc network environment.
Simulation of Route Optimization with load balancing Using AntNet SystemIOSR Journals
This document summarizes a research paper that simulates route optimization and load balancing in computer networks using the AntNet routing algorithm. The AntNet algorithm is based on the behavior of ants and uses forward and backward ants to collect information and update routing tables. The simulation tested the AntNet algorithm against a generic algorithm without AntNet. The results showed that AntNet performed better in terms of throughput, average packet delivery, distance, delay, and failed packets. Specifically, when the simulation speed was 1000 and total packets were 100, AntNet delivered all packets with less delay and distance compared to the generic algorithm which failed 2 packets. This demonstrates that the AntNet algorithm can effectively optimize routes and balance network load.
This document summarizes a review article about energy efficient routing protocols in mobile ad hoc networks (MANETs). It discusses how MANETs use multi-hop wireless connections between mobile nodes without a fixed infrastructure. It then reviews several prominent routing protocols for MANETs, including reactive protocols like AODV and DSR, proactive protocols like DSDV and OLSR, and a hybrid protocol. Finally, it proposes a new energy-efficient clustering-based routing algorithm that selects cluster heads based on node mobility and battery power to improve path efficiency and stability in MANETs.
IMPLEMENTING PACKET BROADCASTING ALGORITHM OF MIMO BASED MOBILE AD-HOC NETWOR...IJNSA Journal
With the rapid growth of wireless communication infras,,tructure over the recent few years, new challenges has been posed on the system and analysis on wireless adhoc networking. Implementation of MIMO communication in such type of network is enhancing the packet transmission capabilities. There are different techniques for cooperative transmission and broadcasting packet in MIMO equipped Mobile Adhoc Network. We have employed a model network in the OPNET environment and propose a new scheduling algorithm based on investigating the different broadcasting algorithm. The new broadcasting algorithm improves the packet transmission rate of the network based on energy performance of the network and minimizes the BER for different transmission mode which is illustrated in this paper. The simulations are done in MATLAB and OPNET environment and the simulated result for the packet transmission rate are collected and shown in the tabular form. Also simulate the network for generating a comparative statement for each mobile node. And performance analysis is also done for the model network. The main focus is to minimize BER and improve information efficiency of the network.
Implementing packet broadcasting algorithm of mimo based mobile ad hoc networ...IJNSA Journal
With the rapid growth of wireless communication infras,,tructure over the recent few years, new
challenges has been posed on the system and analysis on wireless adhoc networking. Implementation of
MIMO communication in such type of network is enhancing the packet transmission capabilities. There
are different techniques for cooperative transmission and broadcasting packet in MIMO equipped
Mobile Adhoc Network. We have employed a model network in the OPNET environment and propose a
new scheduling algorithm based on investigating the different broadcasting algorithm. The new
broadcasting algorithm improves the packet transmission rate of the network based on energy
performance of the network and minimizes the BER for different transmission mode which is illustrated
in this paper. The simulations are done in MATLAB and OPNET environment and the simulated result
for the packet transmission rate are collected and shown in the tabular form. Also simulate the network
for generating a comparative statement for each mobile node. And performance analysis is also done for
the model network. The main focus is to minimize BER and improve information efficiency of the
network.
Congestion Control in Wireless Sensor Networks Using Genetic AlgorithmEditor IJCATR
Sensor network consists of a large number of small nods, strongly interacting with the physical environment, takes
environmental data through sensors, and reacts after processing on information. Wireless network technologies are widely used in most
applications. As wireless sensor networks have many activities in the field of information transmission, network congestion cannot be
thus avoided. So it seems necessary that some new methods can control congestion and use existing resources for providing better traffic
demands. Congestion increases packet loss and retransmission of removed packets and also wastes of energy. In this paper, a novel
method is presented for congestion control in wireless sensor networks using genetic algorithm. The results of simulation show that the
proposed method, in comparison with the algorithm LEACH, can significantly improve congestion control at high speeds.
Energy-Aware Multipath Routing Scheme Based on Particle Swarm Optimization (E...IRJET Journal
The document presents an energy-aware multipath routing scheme called EMPSO for mobile ad hoc networks. EMPSO selects routes based on energy, transmission cost, and optimal path ratio using particle swarm optimization (PSO). It operates in three phases: 1) route setup builds neighbor tables with transmission costs, 2) route discovery finds multiple paths and calculates reliability measures using continuous time recurrent neural networks and PSO to select the best path, 3) route maintenance handles path failures. Simulation results show EMPSO improves packet delivery ratio, reduces overhead and delay, and increases throughput while decreasing total energy consumption compared to the AOMDV routing protocol.
This document outlines a study on implementing a hybrid routing protocol for wireless sensor networks. It discusses the problems with purely proactive or reactive routing protocols and the motivation for a hybrid approach. The document outlines the objectives to implement OLSR and AODV protocols, design a framework to allow them to work together, and test their performance. Preliminary results show the individual protocols working correctly in simulation. The future work involves combining the protocols in the framework and further evaluating the hybrid protocol's performance and efficiency.
i. The document describes an ant colony optimization (ACO) based routing algorithm for mobile ad hoc networks (MANETs). ACO algorithms are inspired by how real ants find the shortest path between their colony and food sources.
ii. In the algorithm, artificial "ants" are generated at nodes and collect information about path lengths and quality as they travel between nodes. They deposit and follow "pheromone trails" to probabilistically route along better paths. This allows the protocol to discover paths and adapt to dynamic topologies.
iii. The algorithm is analyzed in simulation. Results show it constructs probabilistic routing tables where better paths have higher pheromone values and are preferred. It can find next
Routing of traffic sensors in intelligent transportation systemeSAT Journals
Abstract As country develops, the application of technology in each and every field increases to fulfill the demand of people. The application of technology in transportation system is called Intelligent Transportation System (ITS) which has more demand in today’s world for traffic management. Vehicular Ad hoc Network (VANET) is one of the technology used in Intelligent Transportation System. In Vehicular Ad hoc Network temporary network is formed within the vehicles or vehicle to traffic infrastructure which has sensors within it for communication. The temporary network establishes and ends after exchanging the required information. This process should happen within fraction of seconds which is more complicated issue in highly mobile vehicles, so routing is a major problem in Vehicular Ad hoc Network. In this work, hybrid two stage heuristic routing protocol which is based on ant colony optimization and particle swarm optimization algorithm is used to make routing more efficient in Vehicular Ad hoc Network. The MATLAB software is used to implement the algorithm. The result shows that two stage heuristic protocol perform better than Ad hoc on Demand Vector (AODV) protocol. Keywords: Intelligent Transportation System, Vehicular Ad Hoc Network (VANET), Ad Hoc on Demand Vector (AODV), Ant Colony optimization (ACO), Particle Swarm Optimization (PSO)
PERFORMANCE ANALYSIS OF OLSR PROTOCOL IN MANET CONSIDERING DIFFERENT MOBILITY...ijwmn
A Mobile Ad Hoc Network (MANET) is created when an independent mobile node network is connected dynamically via wireless links. MANET is a self-organizing network that does not rely on pre-existing infrastructure such as wired or wireless network routers. Mobile nodes in this network move randomly, thus, the topology is always changing. Routing protocols in MANET are critical in ensuring dependable and consistent connectivity between the mobile nodes. They conclude logically based on the interaction between mobile nodes in MANET routing and encourage them to choose the optimum path between source and destination. Routing protocols are classified as proactive, reactive, or hybrid. The focus of this project will be on Optimized Link State Routing (OLSR) protocol, a proactive routing technique. OLSR is known as the optimized variant of link state routing in which packets are sent throughout the network using the multipoint relay (MPR) mechanism. This article evaluates the performance of the OLSR routing protocol under condition of changing mobility speed and network density. The study's performance indicators are average packet throughput, packet delivery ratio (PDR), and average packet latency. Network Simulator 2 (NS-2) and an external patch UM-OLSR are used to simulate and evaluate the performance of such protocol. As a result of research, the approach of implementing the MPR mechanism are able to minimise redundant data transmission during the normal message broadcast. The MPRs enhance the link state protocols’ traditional diffusion mechanism by selecting the right MPRs. Hence, the number of undesired broadcasts can be reduced and limited. Further research will focus on different scenario and environment using different mobility model.
Optimize the Network Coding Paths to Enhance the Coding Protection in Wireles...IJCNCJournal
- The document proposes an optimized protection technique using network coding and rateless codes to enhance throughput and reduce overhead during data transfer in wireless multimedia sensor networks.
- It presents an Optimal Network Path Model (ONPM) that uses Particle Swarm Optimization to select the best available paths in a way that optimally distributes power usage among network paths to improve throughput.
- The performance of the proposed ONPM is evaluated through simulations and compared to existing algorithms, showing it can enhance coding protection and effectively optimize network paths to improve data transfer in wireless multimedia sensor networks.
Optimize the Network Coding Paths to Enhance the Coding Protection in Wireles...IJCNCJournal
Efficient protection techniques for multimedia data transfer over Wireless Sensor Network (WSN) are very essential issues. In noisy Wireless Multimedia Sensor Networks (WMSN) Quality of Service (QoS) is a challenging task due to bandwidth and limited energy, and unpredictable channel conditions. Therefore, Forward Error Correction (FEC), a class of channel coding has been widely used in WSN. Nevertheless, the bulky size of multimedia data makes it more difficult to be transported over the noisy multi-hop wireless network. Moreover, the efficiency of FEC drops as the number of hops increases. In this paper, an optimized protection technique based on network coding and rateless code has been proposed to enhance the throughput and reduce overhead during data transfer in WMSN. The performance of NCP-OPR is enhanced via Optimal Network Path Model (ONPM) where the best available paths are optimally selected using Particle Swarm Optimization (PSO). In conjunction with the proposed protection scheme, the proposed ONPM is intended for limited power WSN by optimally distributing the power usage among the network paths so that the throughput can be improved.
Shortest path algorithm for data transmission in wireless ad hoc sensor networksijasuc
Wireless sensor networks determine probable in military, environments, health and commercial
applications. The process of transferring of information from a remote sensor node to other nodes in a
network holds importance for such applications. Various constraints such as limited computation, storage
and power makes the process of transferring of information routing interesting and has opened new arenas
for researchers. The fundamental problem in sensor networks states the significance and routing of
information through a real path as path length decides some basic performance parameters for sensor
networks. This paper strongly focuses on a shortest path algorithm for wireless adhoc networks. The
simulations are performed on NS2 and the results obtained discuss the role of transferring of information
through a shortest path.
During route discovery of mobile ad hoc network, broadcasting of route request and route reply packets
are the essential operations for finding the path between two ends. In such situations, intermediate node
which may or may not belongs will participate in route discovery process, update routing table and
rebroadcast the route discovery packets again to its neighboring nodes. Finally optimal path is found with
minimum hops. This simply upsurges overhead and deteriorates the performance of routing. The proposed
Petal Ant Routing (PAR) algorithm offers a low overhead by optimizing FANT and BANT transmissions in
route discover process. The algorithm is an improved version of SARA and has features extracted from
petal routing. The algorithm is simulated on NS2, compared with ACO frame work called SARA and
classical routing protocols such as AODV and AOMDV. The simulation results shows that PAR further
reduces overhead by eliminating redundant FANT transmission compared to other routing algorithm.
This document summarizes a research paper that examines pricing strategy in a two-stage supply chain consisting of a supplier and retailer. The supplier offers a credit period to the retailer, who then offers credit to customers. A mathematical model is formulated to maximize total profit for the integrated supply chain system. The model considers three cases based on the relative lengths of the credit periods offered at each stage. Equations are developed to represent the profit functions for the supplier, retailer and overall system in each case. The goal is to determine the optimal selling price that maximizes total integrated profit.
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This document summarizes research on downdraft gasification of biomass. It discusses how downdraft gasifiers effectively convert solid biomass into a combustible producer gas. The gasification process involves pyrolysis and reactions between hot char and gases that produce CO, H2, and CH4. Downdraft gasifiers are well-suited for biomass gasification due to their simple design and ability to manage the gasification process with low tar production. The document also reviews previous studies on gasifier configuration upgrades and their impact on performance, and the principles of downdraft gasifier operation.
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- The attachment allows a drilling machine to simultaneously drill two holes in a single setting, improving productivity over a single spindle setup.
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The document presents a comparative study of different gantry girder profiles for various crane capacities and gantry spans. Bending moments, shear forces, and section properties are calculated and tabulated for 'I'-section with top and bottom plates, symmetrical plate girder, 'I'-section with 'C'-section top flange, plate girder with rolled 'C'-section top flange, and unsymmetrical plate girder sections. Graphs of steel weight required per meter length are presented. The 'I'-section with 'C'-section top flange profile is found to be optimized for biaxial bending but rolled sections may not be available for all spans.
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This document summarizes a study that investigated the larvicidal effects of Aegle marmelos (bael tree) leaf extracts on Aedes aegypti mosquitoes. Specifically, it assessed the efficacy of methanol extracts from A. marmelos leaves in killing A. aegypti larvae (at the third instar stage) and altering their midgut proteins. The study found that the leaf extract achieved 50% larval mortality (LC50) at a concentration of 49 ppm. Proteomic analysis of larval midguts revealed changes in protein expression levels after exposure to the extract, suggesting its bioactive compounds can disrupt the midgut. The aim is to identify specific inhibitor proteins in the midg
This document presents a system for classifying electrocardiogram (ECG) signals using a convolutional neural network (CNN). The system first preprocesses raw ECG data by removing noise and segmenting the signals. It then uses a CNN to extract features directly from the ECG data and classify arrhythmias without requiring complex feature engineering. The CNN architecture contains 11 convolutional layers and is optimized using techniques like batch normalization and dropout. The system was tested on ECG datasets and achieved classification accuracy of over 93%, demonstrating its effectiveness at automated ECG classification.
This document presents a new algorithm for extracting and summarizing news from online newspapers. The algorithm first extracts news related to the topic using keyword matching. It then distinguishes different types of news about the same topic. A term frequency-based summarization method is used to generate summaries. Sentences are scored based on term frequency and the highest scoring sentences are selected for the summary. The algorithm was evaluated on news datasets from various newspapers and showed good performance in intrinsic evaluation metrics like precision, recall and F-score. Thus, the proposed method can effectively extract and summarize online news for a given keyword or topic.
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AN INNOVATIVE DESIGN OF AN
ANTHOCNET ROUTING ALGORITHM
BASED ON DIFFERENT COMPONENTS
Ashwini G. Mahajan 1
, Prashant R. Deshmukh 2
1 2
CSE Department
12
Sipna College of Engineering and Technology, Badnera, Amravati (India)
1
Email- ashwinimahajan4@gmail.com
ABSTARCT:
Mobile ad hoc networks are a class of highly dynamic networks. In previous work, we developed a new
routing algorithm, called AntHocNet, for these challenging network environments. AntHocNet has been
designed after the Ant Colony Optimization (ACO) framework, and its general architecture shares strong
similarities with the architectures of typical ACO implementations for network routing. On the other
hand, AntHocNet also contains several elements which are new to ACO routing implementations, such as
the combination of ant-based path sampling with lightweight information bootstrapping process, the use
of both reactive and proactive components, and the use of composite pheromone metrics. In this paper we
discuss all these elements, pointing out their general usefulness to face the multiple challenges of mobile
ad hoc networks, and perform an evaluation of their working and effect on performance through
extensive simulation studies.
Keywords: AntHocNet routing algorithm; bootstrap process; reactive and proactive components; pheromone
metrics .
1. INTRODUCTION
Mobile Ad Hoc Networks (MANETs) [1] are networks in which all nodes are mobile and communicate with
each other via wireless connections. Nodes can join or leave at any time. There is no fixed infrastructure. All
nodes are equal and there is no central control or overview. There are no designated routers: nodes serve as
routers for each other, and data packets are forwarded from node to node in a multihop fashion. MANETs are
useful to bring wireless connectivity in infrastructure less areas or to provide instantaneous connectivity free of
charge inside specific user communities and/or geographic areas. However, the control of a MANET is very
challenging. Its topology and traffic patterns are detained by the present users, their positions and radio ranges.
The effectively available bandwidth is defined by the characteristics of the wireless signal between the nodes,
and by the amount of simultaneous contention to access the shared wireless medium. Due to the mobility and
the constant arrival/departure of users, all these characteristics, which make up the mode of the network, change
over time, and different modes can coexist in different parts of the network.
Routing is at the core of the functioning of a MANET, and the challenges mentioned above call for a fully
adaptive, multi-modal routing controller. We believe that the multidimensional complexity of the task makes it
necessary to include multiple learning, adaptive, and behavioral components in the design of the routing
algorithm. This is the approach we followed in AntHocNet [2{6]. It combines Monte Carlo path sampling and
learning using ant agents, which is characteristic of the ACO framework [7], with an information bootstrapping
process, which is typical for dynamic programming and some reinforcement learning approaches [8]. Operating
the two learning mechanisms at different speeds allows to obtain an adaptivity, robustness and efficiency which
neither of the subcomponents could offer on its own. Moreover, the use of both proactive and reactive behaviors
allows to both anticipate and respond in timely fashion to sudden disruptive events. AntHocNet's design also
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includes the use of multiple metrics (e.g., number of hops and signal quality) in the definition of the pheromone
variables used to guide ant decisions.
AntHocNet was inspired by previous work on ACO routing for wired net-works [9], but its composite
design represents a departure from previous instances of ACO algorithms for routing. The effective integration
of a bootstrapping-based mechanisms within a typical ACO architecture is in fact an approach which is
innovative in general terms, and not only concerning the application of ACO to network problems. Furthermore,
the way we integrated the two mechanisms in AntHocNet is rather general and could be applied with success
also to different application domains. Moreover, while the combined use of reactive and proactive ant
generation, as well as the use of a composite pheromone metric, are not totally a novelty in ACO routing
algorithms, the way these schemes are used is original and general (e.g., see [10{12] for examples of other ACO
algorithms for MANETs).
The purpose of this paper is to report an experimental analysis of the role and effect of these different design
components of the algorithm. In particular, we show the effect on performance of using bootstrapping and
proactive components, of adopting different choices for the composite pheromone metric used to guide ant
activities, and of selecting different levels of exploration. Even if this sensitivity analysis is specific for
AntHocNet, we believe that to a certain extent the reported results can also provide general insights about all the
considered issues, and in particular about the integration of ant-based path sampling with pheromone
bootstrapping mechanisms.
The general effectiveness of AntHocNet's integrated approach was assessed in a number of papers [2{6] and
a technical report [13]. Over a wide range of scenarios with different characteristics in terms of mobility, data
traffic load, modality, etc., AntHocNet always showed excellent performance compared to state-of-the-art
MANET routing algorithms such as AODV [14] and OLSR [15]. In this paper we focus on the sensitivity
analysis and we do not report any further results concerning AntHocNet's general performance.
The rest of the paper is organized as follows. In Section 2 we provide a concise description of AntHocNet
(for more details the reader can consult the mentioned references). Section 3 describes the experimental
methodology and the general characteristics of the simulation environment.
2. THE ANTHOCNET ROUTING ALGORITHM
In MANET jargon AntHocNet is termed a hybrid algorithm since it makes use of both reactive and proactive
strategies to establish routing paths. It is reactive in the sense that a node only starts gathering routing
information for a specific destination when a local traffic session needs to communicate with the destination and
no routing information is available. It is proactive because as long as the communication starts, and for the
entire duration of the communication, the nodes proactively keep the routing information related to the ongoing
flow up-to-date with network changes. In this way both the costs and the number of paths used by each running
flow can reflect the actual status of the network, providing an optimized network response. The reactive
component of the algorithm deals with the phase of path setup and is totally based on the use of ACO ant agents
to find a good initial path. Routing information is encoded in node pheromone tables. The proactive component
implements path maintenance and improvement, proactively adapting during the course of a session the paths
the session is using to network changes. Path maintenance and improvement is realized by a combination of ant
path sampling and slow-rate pheromone diffusion: the routing information obtained via ant path sampling is
spread between the nodes of the MANET and used to update the routing tables according to a bootstrapping
scheme that in turn provide main guidance for the ant path exploration. Link failures are dealt with using a local
path repair process or via explicit notification messages. Stochastic decisions are used both for ant exploration
and to distribute data packets over multiple paths.
In the following we provide a concise description of each of these components. The component dealing with
link failures is not described since it is neither central for the algorithm nor relevant for the sensitivity analysis
reported here.
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2.1. Metrics for path quality and pheromone tables
Paths are implicitly defined by tables of pheromone variables playing the role of routing tables. An entry Tnd
i
ϵ R of the pheromone table T i
at node i contains a value indicating the estimated goodness of going from i over
neighbor n to reach destination d. Since AntHocNet only maintains information about destinations which are
active in a communication session, and the neighbors of a node change continually, the filling of the pheromone
tables is sparse and dynamic. Several different metrics, such as number of hops, end-to-end delay, signal quality,
congestion, etc., can be used to de ne the goodness of a path. AntHocNet makes use of a combination of these
metrics to define the pheromone variables.
2.2. Reactive path setup
When a source node s starts a communication session with a destination node d, and it does not have routing
information for d, it broadcasts a reactive forward ant. At each node, the ant is either unicast or broadcast,
according to whether or not the current node has pheromone information for d. If information is available, the
ant chooses its next hop n with the probability Pnd which depends on the relative goodness of n as a next hop,
expressed in the pheromone variable Tnd
i
:
(Tnd
i
)β
Pnd = ,β≥1 (1)
∑jϵN
(Tjd
i
)β
where Nd
i
is the set of neighbors of i over which a path to d is known, and is a parameter which controls the
exploratory behavior of the ants. If no pheromone is available, the ant is broadcast. Since it is quite likely that
somewhere along the path no pheromone is found, in the experiments we normally use a high value of to avoid
excessive ant proliferation. Due to subsequent broadcasts, many duplicate copies of the same ant travel to the
destination. A node which receives multiple copies of the same ant only accepts the first and discards the other.
This way, only one path is set up initially. During the course of the communication session, more paths are
added via the proactive path maintenance and exploration mechanism discussed in the next subsection.
Each forward ant keeps a list of the nodes it has visited. Upon arrival at the destination d, it is converted into
a backward ant, which travels back to the source retracing the path. At each intermediate node i, coming from
neighbor n, the ant updates the entry Tnd
i
in the i's pheromone table. The way the entry is updated depends on
the path quality metrics used to de ne pheromone variables. For instance, if the pheromone is expressed using
the number of hops as a measure of goodness, at each hop the backward ant increments an internal hop counter
and uses the inverse of this value to locally assign the value d
i
which is used to update the pheromone variable
Tnd
i
as follows: Tnd
i
= Tnd
i
+ (1 ) d
i
; 2 [0; 1]: For different metrics, the calculation of d
i
is more complex but
follows the same logic. For instance, if delay is used, the ant needs to incrementally calculate at each node a
robust estimate of the expected delay to reach the destination.
2.3. Proactive path maintenance and exploration
During the course of a communication session, source nodes periodically send out proactive forward ants to
update the information about currently used paths and try to find new and better paths. They follow pheromone
and update pheromone tables in the same way as reactive forward ants. Such continuous proactive sampling of
paths is the typical mode of operation in ACO routing algorithms. How-ever, the ant sending frequency needed
to faithfully keep track of the constant network changes is in general too high for the available bandwidth.
Moreover, to find entirely new paths, excessive blind exploration through random walks or broadcasts would be
needed. Therefore, we keep ant sending rate low but ant actions are integrated with a lightweight process
combining pheromone diffusion and bootstrapping. This process provides a second way of updating pheromone
on existing paths, and can give information to guide exploratory ant behavior.
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Pheromone diffusion is implemented using beacon messages broadcast periodically and asynchronously by
the nodes to all their neighbors. In these messages, the sending node n places a list of destinations it has
information about, including for each destination d its best pheromone value Tm
n
d . A node i receiving the
message from n first of all registers that n is its neighbor. Then, for each destination d listed in the message, it
derives an estimate of the goodness of going from i to d over n, combining the cost of hopping from i to n with
the reported pheromone value Tm
n
d . We call the obtained estimate Bnd
i
bootstrapped pheromone, since it is built
up bootstrapping on the value of the path goodness estimate received from an adjacent node. The bootstrapped
pheromone can in turn be forwarded in the next message sent out by n, giving rise to a bootstrapped pheromone
field over the MANET. This is the typical way of calculating estimates followed by all approaches based on
dynamic programming such the class of distributed Bellman-Ford routing algorithms [16] and the rein-
forcement learning algorithms derived from Q-learning [8]. However, due to the slow multi-step forwarding,
bootstrapped pheromone does not provide the most accurate view of the current situation and has difficulty to
properly track the distributed changes in the network. Generally speaking, bootstrapping alone is not expected to
work effectively in highly non-stationary environments. However, here the bootstrapped pheromone is obtained
via a lightweight, efficient process, and is complemented by the explicit Monte Carlo path sampling and
updating done by the ants. In this way we have two complementary updating frequencies in the path updating
process. Bootstrapped pheromone is used directly for the maintenance of existing paths. That is, if an entry Tnd
i
is present in the routing table, Bnd
i
is used as a replacement of it. For path exploration, bootstrapped pheromone
is used indirectly. If i does not yet have a value for Tnd
i
in its routing table, Bnd
i
could indicate a possible new
path from i to d over n. However, this path has never been sampled explicitly by an ant, and due to the slow
multi-step process it could contain undetected loops or dangling links. It is therefore not safe to use for data
forwarding before being checked. This is the task of proactive forward ants, which use both the regular and the
bootstrapped pheromone on their way to the destination. This way, promising pheromone is investigated, and
can be turned into a regular path available for data. This increases the number of paths available for data routing,
which grows to a full mesh, and allows the algorithm to exploit new opportunities in the ever changing
topology.
2.4 Stochastic data routing
Nodes in AntHocNet forward data stochastically according to the pheromone values. When a node has multiple
next hops for the destination d of the data, it randomly selects one of them, with probability Pnd . Pnd is
calculated like for reactive forward ants, using Eq. 1. According to this strategy, a mesh of multiple paths is
made available to route data. The number of paths to use is automatically and dynamically selected in function
of their estimated quality.
3. EXPERIMENTAL METHODOLOGY AND CHARACTERISTICS OF THE SIMULATION
ENVIRONMENT
For the study of the performance of AntHocNet, we use simulation experiments. This is the most common
approach in MANETs, since the complexity of this kind of networks makes analytical evaluations difficult and
limited in scope, while the high costs involved in purchasing and configuring hardware limit the use of real test
beds. As simulation software, we use QualNet [17], a commercial simulation package which comes with correct
implementations of the most important protocols at all layers of the network protocol stack.
All the simulation tests reported in this paper last 900 seconds, and each data point represents the average taken
over 10 runs using different random seeds. The tests are carried out in open space scenarios (see [13] for
evaluations of AntHocNet in a structured urban scenario). 100 nodes move in an area of 2400 800 m2
. The
movements of the nodes are defined according to the random waypoint mobility model [18]. Nodes pick a
random destination point in the area, and move to that point with a randomly chosen speed. Upon arrival, they
stay put for a fixed pause time, after which a new random destination and speed are chosen. In our experiments,
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the node speed is chosen uniformly between 0 and 10 m=s, unless stated otherwise. The pause time is always 30
seconds.
Radio signal propagation is modeled with the two-ray ground reflection model, which considers both the
direct and the ground reflection path [19]. The trans-mission range of each node is 250 meters. At the physical
and medium access control layers of the network protocol stack, we use the IEEE 802.11b protocol in DCF
function with 2 Mbits/s bandwidth. At the application layer, data traffic is generated by 20 constant bit rate
(CBR) sources, sending packets of 64 bytes. The CBR sessions start at a random time between 0 and 180
seconds after the start of the simulation, and go on until the end of the simulation. The data rate is 4 packets per
second, unless stated differently. CBR uses the UDP protocol at the transport layer. All these settings reflect
choices widely adopted in MANET research. Concerning the AntHocNet parameters, if not stated differently,
the value of in Eq. 1 is set to 20, the maximum number of entries in the pheromone diffusion messages is set to
10, and the sending interval for the proactive ants is 2 seconds.
To evaluate the performance of the routing algorithms, we measure the average end-to-end delay for data
packets and the ratio of correctly delivered versus sent packets (delivery ratio). These are standard measures of
effectiveness in MANETs. Other metrics which we consider are delay jitter and routing overhead. Delay jitter is
the average difference in inter-arrival time between packets. This is an important metric in quality-of-service
networks and in MANETs provides also a measure of the stability of the algorithm's response to topological
changes. Routing overhead is a measure of efficiency. We calculate it as the number of control packet
transmissions (counting every hop) per data packet delivered. Due to space limitations we do not show the
results for jitter and overhead. In any case, for all the tests of Section 4, the results for jitter and overhead always
follow the same trends of those for delivery ratio and end-to-end delay.
4. CONCLUSION
MANETs are extremely dynamic network environments. Their multi-modality represents an important
challenge for algorithms at all levels of the network protocol stack, and specifically for routing. We addressed
these challenges with AntHocNet, a routing algorithm designed after ACO ideas. AntHocNet was introduced in
previous work and showed superior performance compared to other state-of-the-art algorithms over a wide
range of MANET simulation scenarios [2{ 6, 13]. In this paper we discussed AntHocNet emphasizing its
innovative design, especially with respect to previous ACO algorithms for routing. In particular, we pointed out
the fact that AntHocNet is based on the integration of reactive and proactive components, and on the integration
of the typical ACO path sampling mechanism with the learning of routing information using an information
bootstrapping process. In a detailed experimental study we have investigated the role and the importance of
these and other different components of the algorithm, studying their effect on the overall performance. The
effectiveness of the use of a composite design to deal with the multiple challenges of MANETs, and in
particular the effectiveness of combining ant-based Monte Carlo sampling with pheromone bootstrapping, has
been confirmed by the experimental results. Moreover, the experimental analysis has pointed out the need for
adopting low-overhead and low-interference strategies for exploration and data forwarding, as well as the
importance of defining a composite pheromone metric taking into account different multiple aspects of the
network environment.
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