Panos Bakalis

Performance Evaluation of CBR and TCP Traffic Models on MANET Using DSR Routing Protocol

The science of computer networking and the proliferation of mobile devices enable the capabilities of communicating with each other even in areas with no pre-existing communication infrastructure. Traffic and mobility models play an important role in evaluating the performance of these networks, despite criticism and assumption from various researches on TCP’s weaknesses on MANET. A simulation was carried out to evaluate the performance of CBR over TCP on MANET using DSR routing protocol. Although CBR and TCP have significant different manufacture behaviour on MANET, these differences lead to significant performance of CBR over TCP with better throughput and less average maximal end-to-end delay. DSR was able to respond to link failure at low pause time, this led to TCP’s performance in packets delivery.

Power Control and Performance Comparison of AODV and DSR Ad Hoc Routing Protocols

A technique is proposed to evaluate the effect of ambient noise and path loss have on received signal strength of mobile node in a mobile ad hoc network environment using optimized network (OPNET) simulator while comparing the performance of Ad-Hoc on demand distance vector (AODV) and dynamic source routing (DSR) protocols. Numerical and simulation results presented illustrate how the performance of an ad hoc network protocol drastically changes as a result of changing the mobility model and power control system of the network. The simulation result for DSR and AODV showed a significant improvement with 86.8% decrease in end-to-end delay (sec), while AODV also showed 68.5% drop in end-to-end delay. The network load simulation result revealed that DSR protocol maintained a constant load while there was a 75%drop in routing load for AODV protocol. The simulation results of AODV and DSR routing protocols showed 99%and 98%confidence intervals respectively.

A Virtualized Network Testbed for Zero-Day Worm Analysis and Countermeasure Testing

Computer network worms are one of the most significant malware threats and have gained wide attention due to their increased virulence, speed and sophistication in successive Internet-wide outbreaks. In order to detect and defend against network worms, a safe and convenient environment is required to closely observe their infection and propagation behaviour. The same facility can also be employed in testing candidate worm countermeasures. This paper presents the design, implementation and commissioning of a novel virtualized malware testing environment, based on virtualization technologies provided by VMware and open source software. The novelty of this environment is its scalability of running virtualised hosts, high fidelity, confinement, realistic traffic generation, and efficient log file creation. This paper also presents the results of an experiment involving the launch of a Slammer-like worm on the testbed to show its propagation behaviour.

The performance of dynamic source routing protocol to path loss models at carrier frequencies above 2 GHz

In this paper, we describe a simulation study of the impact of wireless channel on Dynamic Source Routing (DSR) protocol performance at microwave carrier frequencies above 2 GHz. Simulation results show that at microwave carrier frequencies above 2 GHz, when the two-slope path loss model is used for channel modelling, the breakpoint distance affect the end-to-end throughput of the DSR protocol in Mobile Wireless Ad Hoc Network (MANET), whilst at frequencies below 2 GHz the end-to-end throughput for the free space and the two-slope path loss model was the same.

Optimised adaptive power on-demand routing protocol for mobile ad hoc wireless network

A technique is developed for ad hoc on-demand routing protocol. The protocol is based on the conventional on-demand ad hoc routing protocols with the addition of power model. The algorithm design and development is aimed to incorporate the transmitted power consumption function in such a manner that mobile nodes are able to evaluate their power status to decide if they are fit for packet forwarding and reception. This is illustrated through analytical approach supported by computer simulations over mobile ad hoc wireless network containing 80 mobile nodes. The results showed that power savings of 50% were achieved with no delay in the network and increased throughput performance by 60%, as compared to a network with conventional ad hoc on-demand distance vector and dynamic source routing protocols.

Power Consumption Analysis in Mobile Ad Hoc Networks

The central challenge in the design of ad-hoc wireless networks is the development of a dynamic routing protocol that efficiently finds routes between mobile nodes. Several network routing protocols such as Dynamic Source Routing (DSR), Ad Hoc On-demand Distance Vector (AODV) and Destination Sequence Distance Vector (DSDV) have been proposed to facilitate communication in a dynamically changing network area. Mobile Ad hoc Network (MANET) is faced with various challenges such as resource consumption during network routing operation. This paper present results from detailed power measurement studies of MANETs with emphasis on power consumption with different antenna designs. Computational simulation is used to analyse the power consumption in MANET on two platforms i.e. network configured with directional and omni directional antenna. The simulation results show that networks configured with directional antennas save 68% of the power as compared to networks configured with omni-directional antennas. While 99%packet delivery ratio were achieved with networks configured with directional antenna as compared to network with omni directional antenna.

Investigating the Impact of Traffic Type on the Performance of on Demand Routing Protocols and Power Consumption in MANET

Design of a power-aware protocol in mobile Ad hoc network (MANETs) and its evaluation requires good knowledge of mobile nodes power consumption behavior. Some studies have been reported in the literature to evaluate the performance of MANETs On-demand routing protocols under Transmission control protocol (TCP) and Constant bit rate (CBR) traffic type. However, little work has been done to evaluate this performance in terms of their power consumption behavior under different traffic types. This paper investigates and quantifies the impact of traffic type (TCP and CBR) on the power consumption, network throughput and end to end delay in MANET using OPNET Modeler 17.1 network simulator. Simulation results show that AODV/CBR recorded the lowest power consumption after 900 s of continuous packet transmission as compare to AODV/TCP, DSR/CBR and DSR/TCP. Also, AODV/CBR deliver the optimum performance in all other chosen metrics, thus a better choice for an efficient and power aware routing protocol in MANET.

Sensitivity of DSR Protocol Performance to Propagation Loss Models at Higher Microwave Frequencies

In this paper, we describe a computer simulation study of the sensitivity of Dynamic Source Routing (DSR) protocol performance to wireless channel at microwave carrier frequencies greater than 2 GHz. Performance simulation results show that at microwave carrier frequencies greater than 2 GHz, the break point distance effect the performance of the Dynamic Source Routing Protocol in Mobile Wireless Ad Hoc Network (MANET). Whilst at microwave carrier frequencies less than 2 GHz, the break point distance has no effect on the delay and BER of the Dynamic Source Routing Protocol (DSR) as compared to the free space propagation loss model.

Impact of propagation loss parameters on Dynamic Source Routing protocol at higher microwave carrier ferquencies

This paper, uses computer simulation to study the impact of wireless channel on the performance of Dynamic Source Routing (DSR) protocol for multi-hop wireless ad hoc networks of mobile nodes at higher microwave carrier frequencies greater than 2 GHz. Simulation results shows that as the path loss exponent of the propagation model increases the received signal power at individual mobile nodes also increases. The path loss exponent had no effect on the end-to-end throughput of the DSR protocol for multi-hop wireless ad hoc networks.

Performance Optimisation of Mobile Ad hoc Reactive Routing Protocols

In this paper, we optimized the performance of Ad hoc on Demand Vector (AODV) and Dynamic Source Routing (DSR) protocols through simulation. Numerical and simulation results presented illustrate how the performance of an ad hoc network protocol drastically changes as a result of changing the mobility model and ambient noise level in the network. The simulation results showed that, in the presence of ambient noise level in the network, AODV and DSR protocols have a significant improvement in end-to-end delay reduction with 68.5 % for AODV and 86.8% for DSR respectively. The network load simulation result revealed that DSR protocol maintains a constant routing load while the AODV protocol shows a 75% drop in routing load.