Performance evaluation of routing metrics for community Wireless Mesh Networks

Abstract

A thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Master of Engineering in Network Engineering. Victoria University of Wellington 2012I am most grateful to my supervisor Professor Winston Seah, who has helped me throughout the course of my Masters degree. He has guided me towards a realistic and interesting research topic, provided support and valuable suggestions. Winston has impressed faculty and students alike, both as an advisor and researcher. He has taught me how to improve my research skills, how to identify/address a problem and, how to write technical journals. We have learnt a lot from him during our numerous discussions.Wei Li is a senior lecturer in the school. He has given valuable suggestions and shared his experiences in the research field as one friend would to another.Mike Lin and Dong Xia, my lab mates, for extending helping hands throughout the course of my study. They helped me understand the fundamentals and improved my coding skills. They worked along with me when I encountered programming bugs. Casimirraj Subramanian, for proof reading my thesis which improved iii iv the thesis quality.Information and Communication Networks Laboratory of Niigata University release the OLSRv2 module for QualNet that includes the ETX metric. It has been very useful from the beginning of my simulation. I would also like to thank IMAI Hiroei from the Information and Communication Networks Laboratory. We corresponded through emails, and each contact helped me understand the OLSRv2 module a little better.Ross Whitcher of VillageNets for providing the network topology maps which were useful for plotting node locations in our simulations.I want to thank everyone in the Network Engineering Research Group for making it a stimulating place to work and learn. My lab mates deserve special thanks for being patient with my questions.

OF-FL: QoS-aware fuzzy logic objective function for the RPL routing protocol

“…An ETX based network has a comparable packet loss ratio as OF-FL, and this result can due to the use of the same link quality estimator which is ETX. Minimizing the ETX when selecting the next hop will imply a path with low packet loss ratio [35]. For the three schemes, we notice that the packet loss ratio is high mainly when the number of hops increases.…”

Multipath routing approach to enhance resiliency and scalability in ad-hoc networks

“…On the other hand side, De Couto et al in [8] investigate the functionality of DSDV by comparing the ETX with the hop count metric and indicate that there is a negative impact on the size of the routing overhead, but it is considered insignificant compared to the sufficient increase of throughput. Finally Liu et al in [11] performs the same comparison in OLSRv2. The authors recognized that ETX performs better when the paths are longer and the traffic is higher but is flawed when paths are small and traffic is considered light.…”

Analysis of HWMP-ETX Routing in Wireless Mesh Networks

“…The cross layer routing metric ETX is compared with hop count using OLSRv2 by Nan Liu and et al [11]. VOIP, FTP and HTTP traffic scenario are used to analyze the performance of OLSRv2 and OLSRv2-ETX.…”