Masahiro Hiyama

Performance Evaluation of WMN Considering Number of Connections Using NS-3 Simulator

Wireless Mesh Networks (WMNs) are currently attracting a lot of attention due to their ability to provide cost-efficient broadband wireless connectivity. In this paper, we evaluate the performance of a WMN by simulations considering packet delivery ratio (PDR), throughput and delay. For simulations, we used ns-3 simulator and Hybrid Wireless Mesh Protocol (HWMP). We evaluate the performance of the WMN by sending multiple Constant Bit Rate (CBR) flows in the network. The simulation results show that for higher values of transmission rate and 30 connections, the delay and jitter increased very much, so the real-time applications, like video streaming, become difficult.

Evaluation of MANET protocols for different indoor environments: results from a real MANET testbed

A mobile ad hoc networks (MANETs) is a collection of wireless mobile terminals, which create a temporary network without relying on a fixed infrastructure. MANETs are attracting attention for their potential use in several fields such as collaborative computing and communications in small areas. Considering mobility of the terminals, routing is a key process for operation of MANETs. In this paper, we analyse the performance of optimised link state routing (OLSR) and better approach to mobile ad hoc networking (BATMAN) protocols, in an indoor horizontal topology for three different scenarios. We also analyse the performance of OLSR protocol in an indoor vertical topology for two scenarios. We compare the results for horizontal and vertical topology considering OLSR protocol. From our experiments, we found that the mobility and node distance affect more the throughput and packetloss in the vertical topology.

Performance Evaluation of a MANET Tested for Different Topologies

In this paper, we present the implementation and analysis of our implemented testbed considering the Optimized Link State Routing (OLSR) protocol. We investigate the effect of mobility and topology changing in the throughput of a Mobile Ad-hoc Network (MANET). The mobile nodes move toward the destination at a regular speed. When the mobile nodes arrive at the corner, they stop for about three seconds. Experimental time is 150 seconds. In our experiments, we consider two cases: only one node is moving (mobile node) and one of OLSR daemon stopped at 50 seconds, after that it start at 100 seconds. We assess the performance of our tested in terms of throughput, Round Trip Time (RTT) and packet loss. From our experiments, we found that the node join and leave operations affect more the TCP throughput and RTT than UDP.

Mobility Effects in Mobile Ad Hoc Networks

In this paper, we present the implementation and analysis of our implemented testbed considering the Optimized Link State Routing (OLSR) protocol. We investigate the effect of mobility and topology changing in the throughput of a Mobile Ad hoc Network (MANET). The mobile nodes move toward the destination at a regular speed. When the mobile nodes arrive at the corner, they stop for about three seconds. Experimental time is 150 seconds. In this work, we consider 6 models and we assess the performance of our testbed in terms of throughput, round trip time and packet loss. From our experiments, we found that the OLSR protocol has a good performance when the source node is moving. However, the performance is not good when the relay nodes are moving.

Application of a MANET Testbed for horizontal and vertical scenarios: performance evaluation using delay and jitter metrics

Mobile ad hoc networks are attracting attention for their potential use in several fields such as collaborative computing and communications in indoor areas. Mobility and the absence of any fixed infrastructure make MANETs very attractive for mobility and rescue operations and time-critical applications. Considering mobility of the terminals, routing is a key process for operation of MANETs. In this paper, we analyze the performance of Optimized Link State Routing protocol in an indoor environment considering different scenarios for horizontal and vertical topologies. We evaluate the scenarios based on delay and jitter metrics. The experimental results show that for vertical topology the performance is affected more by mobility and number of hops, in comparison with the horizontal topology.

MANET performance for source and destination moving scenarios considering OLSR and AODV protocols

Recently, a great interest is shown in MANETs potential usage and applications in several fields such as military activities, rescue operations and time-critical applications. In this work, we implement and analyse a MANET testbed considering AODV and OLSR protocols for wireless multi-hop networking. We investigate the effect of mobility and topology changing in MANET and evaluate the performance of the network through experiments in a real environment. The performance assessment of our testbed is done considering throughput, number of dropped packets and delay. We designed four scenarios: Static, Source Moving, Destination Moving and Source-Destination Moving. From our experimental results, we concluded that when the communicating nodes are moving and the routes change quickly, OLSR (as a proactive protocol) performs better than AODV, which is a reactive protocol.

Performance comparison of OLSR and BATMAN routing protocols by a MANET testbed in stairs environment

A Mobile Ad-hoc Network (MANET) is a set of mobile terminals, which move in different directions with different speeds. MANETs are found very useful in real applications such as time-lacking implementations and indoor environments. In this paper, we analyze the behavior of Optimized Link State Routing (OLSR) and Better Approach To Mobile Ad-hoc Network (BATMAN) routing protocols, in stairs environment, based on real data from our MANET testbed. We evaluate the performance considering three metrics: throughput, delay and packet loss. We design and implement two experimental scenarios: static stairs scenario and shifting stairs scenario. From our experiments, we show that as the number of hops increases to three or more hops, the performance of the communication decreases. The performance decreases further when the nodes are mobile. However, OLSR shows a better performance than BATMAN.

Effect of Roadside APs in VANETs: A Comparison Study

In recent years, Vehicular Ad-hoc Networks (VANETs) have emerged as a unique type of MANETs. VANETs are an important component of the Intelligent Transportation Systems (ITS). They can been utilized to guarantee road safety, avoid potential accidents and create new forms of inter-vehicle communications. In this paper, we investigate the performance of OLSR protocol for video streaming application. The simulations are conducted in urban environment in two scenarios, where roadside Access Points (AP) are present and not present. We consider 802.11p standard and send multiple video streaming flows over UDP. We use throughput, delay and jitter as evaluation metrics. Based on simulation results, we noticed that transmission for streaming is improved when roadside AP are used.

Mobile Ad-hoc Network Routing Protocols Performance Evaluation Using NS-3 Simulator

Wireless networks have become increasingly popular. They can provide mobile users with ubiquitous communication capability and information access regardless of locations. In this paper, we evaluate the throughput of wireless multihop networks by simulations. For simulations, we used ns-3 network simulator considering Ad hoc On-Demand Distance Vector (AODV), Optimized Link State Routing (OLSR) and Destination-Sequenced Distance-Vector (DSDV) routing protocols. We also evaluate the average throughput, the average packets received rate and the percentage of Constant Bit Rate (CBR) for different area sizes and different number of nodes. The evaluation results show that OLSR has the best performance than other protocols for smaller area.

Analysis of MANET Routing Protocols for Indoor Environment

In recent years, wireless multi-hop networks such as ad hoc networks, sensor networks, and vehicular networks have been very important subject for research. Mobile Ad hoc Network (MANET) is a collection of wireless mobile terminals that are able to dynamically form a temporary network without any aid from fixed infrastructure or centralized administration. In this paper, we present the implementation and analysis of our implemented MANET simulation system considering Ad-hoc On demand Distance Vector (AODV), Dynamic MANET On-demand (DYMO) and Optimized Link State Routing (OLSR) protocols for wireless multi-hop networking. We investigate the effect of mobility and topology changing in MANET. We study the impact of source and destination movement for indoor environment. In this work, we consider three models: stationary, source and destination movement scenario and random way-point models. We assess the performance of our simulation system in terms of throughput, number of received packets and hop distance. From the results, we found that the AODV protocol has a good performance when the source and destination nodes are moving. Also the AODV protocol provides a flexible and effective routing for indoor environment.