Jason's Computer Science Blog » Mesh

AINA 2009 Conference Presentation

Jason Ernst — Mon, 01 Jun 2009 18:04:29 +0000

This past week I travelled to the UK to present at my first International Conference – Advanced Information Networking and Applications (AINA 2009) in Bradford, UK. My presentation was on “Fair Scheduling in Wireless Mesh Networks with Multiple Gateways”. The paper for the conference was published in the main AINA conference and I presented on the first day, in the first session. It was nice to have it over with right away so that I could relax and focus on meeting as many people as possible at the conference.

There were people from 40 different countries there and I feel like I met someone from almost every one of them at some point. There were over 300 people at AINA this year, which apparently is down from the last couple of years (where they had 4-500) but it was still a great conference for me. I will post my slides from my presentation in this post in case anyone is interested, along with a link to the paper once it is available. I submitted another paper last night for a conference in Toronto and am working on two more papers, so hopefully I’ll be travelling soon. I am trying to aim for ICC in South Africa next year.

Here are a few pictures from the conference.

Abstract:
This paper addresses the problem of scheduling in Wireless Mesh Networks (WMNs). The paper first discusses existing scheduling algorithms and classifies them based on the technique they use and their implementation frameworks.Then detailed discussions of the proposed scheduling method are presented. Simulation experiments are conducted to compare the performance of fair scheduling with the method that does not use fair scheduling. The simulation results confirm that the proposed scheduling method has better performance with respect to the metrics used for performance evaluation.

J.B. Ernst, M.K. Denko, “Fair Scheduling with Multiple Gateways in Wireless Mesh Networks”, in Proc. of the 22nd IEEE Int. Conf. on Advanced Information Networking and Applications (AINA 2009), Bradford UK, 2009.

The paper itself is available through IEEE Xplore

Updated: NS-2.33 and HWMP rev 183 on Intrepid Ibex 8.10

Jason Ernst — Mon, 16 Feb 2009 19:21:09 +0000

This post is some quick instructions on how to install ns-2.33 and the hybrid wireless mesh protocol (hwmp) on Ubuntu Intrepid Ibex. More detail will be added later, just for quick reference right now.

Update Ubuntu:

sudo apt-get update

sudo apt-get upgrade

sudo apt-get install libxt-dev

Download the NS-2.33 and HWMP All-in-One Package here:

Updated with new link: *

wget https://forge.iitp.ru/ns2/hwmp/ns-2.33_hwmp_rev183.patch.bz2

Untar the file:

tar xvf ns*.tar.bz2

Configure and Install NS2

cd ns

./configure

make

sudo make install

All ready to go. Enjoy.

Fair Scheduling & Load Balancing in WMN

Jason Ernst — Wed, 28 May 2008 16:42:43 +0000

My research is becoming more focused as of late towards the area of fair scheduling and load balancing in Wireless Mesh Networks. Earlier this week I gave a talk in our wireless research group at Guelph on WMN: Fair Scheduling and Load Balancing which I will make available at the bottom of the post.

The presentation gave a background on why load balancing and scheduling are important in WMNs. Additionally a survey on the current problems that I find interesting in the area was presented. In case you don’t want to get the presentation / you don’t have MS Office here are the main points from the presentation:

Why is Fair Scheduling Important in WMN:

Starvation & Unequal Quality of Service (Qos) caused by “greedy” flows or proximity from Gateways which allow other traffic to be ignored or serviced unequally
In commercial applications of WMNs customers pay equal amounts and expect equal service
In many solutions that exist today, we cannot have Fairness and Throughput at the same time

Example of a Wireless Mesh Network : netdts.com

Why is Load Balancing Important in WMN:

Multiple path redundancy is an important trait of WMN however instead of traffic being spread around the multiple links, often the same links become overused and congested while other links are barely used
Load Balancing tries to solve this problem using at Mesh Routers, Gateways, and sometimes Links to attempt to spread the traffic around the network (although some papers claim that Load Balancing on the links isn’t effective)

Current Problems in Fair Scheduling and Load Balancing in WMN:

Assumptions in some papers: single hop networks only, limited or no mobility (of the Mesh Routers), fixed topology (Mesh Routers cannot be added or removed and the topology is known at all times)
Some papers assume that uplink and downlink scheduling can be treated the same when it may be beneficial to treat them independently
Distributed Vs Centralized Scheduling & Load Balancing
Future work on many papers cite experimentation with different metrics, optimal locations and number of gateways etc.
Thorough investigation of load balancing at the gateways, links or mesh routers

If after all this you would still like the presentation, you can download it from the link below:

Download:

Fair Scheduling and Load Balancing in Wireless Mesh Networks by Jason Ernst. May 26th 2008.