Co channel interference modelling between rats in heterogeneous wireless networks
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Co-channel Interference Modelling Between RATs in Heterogeneous Wireless Networks. Jason B. Ernst, University of Guelph Nidal Nasser, Alfaisal University Joel Rodrigues, University of Beira Interior. Presented at ICC 2012 – Wireless Network Symposium – June 14 th 2012. Introduction.

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Co-channel Interference Modelling Between RATs in Heterogeneous Wireless Networks

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Co channel interference modelling between rats in heterogeneous wireless networks

Co-channel Interference Modelling Between RATs in Heterogeneous Wireless Networks

Jason B. Ernst, University of Guelph

Nidal Nasser, Alfaisal University

Joel Rodrigues, University of Beira Interior

Presented at ICC 2012 – Wireless Network Symposium – June 14th 2012


Introduction

Introduction

  • Motivation

  • Background

  • Experiment Setup & Methodology

  • Performance Evaluation

  • Discussion

  • Conclusions & Future Work

ICC 2012- Wireless Network Symposium - June 14th, 2012


Motivation

Motivation

  • Modern devices have many options for connectivity (radio access technologies) or RATs

ICC 2012- Wireless Network Symposium - June 14th, 2012


Motivation1

Motivation

  • How can we seamlessly switch between RATs or enable multiple RATs simultaneously?

ICC 2012- Wireless Network Symposium - June 14th, 2012


Motivation problems

Motivation: Problems?

  • Interaction between RATs is not well studied

  • Simulation tools often ignore interference between Wi-Fi and Bluetooth for example

ICC 2012- Wireless Network Symposium - June 14th, 2012


Motivation problems1

Motivation: Problems?

  • Interaction between RATs is not well studied

  • Certain algorithms assume homogeneous link capacities

ICC 2012- Wireless Network Symposium - June 14th, 2012


Motivation problems2

Motivation: Problems?

Source: Wikipedia

Source: Cisco

ICC 2012- Wireless Network Symposium - June 14th, 2012


Motivation why bother

Motivation: Why Bother?

  • Many reasons why the ability to seamless switch RATs is important:

    • More robust and reliable communications

      • Failover to other networks using different RATs

    • Potentially increased battery life

      • Selecting the most energy efficient RAT when possible

    • Potentially improved performance

      • Enabling multiple RATs at once

ICC 2012- Wireless Network Symposium - June 14th, 2012


Background

Background

  • Previous studies show that partial overlapping of Wi-Fi channels does not significantly affect performance

    [Mishal et al, 2006]

  • What about overlap between RATs(ex: Wi-Fi, Bluetooth, Zigbee)?

ICC 2012- Wireless Network Symposium - June 14th, 2012


Background1

Background

  • Will performance degrade with a small channel interfering with a larger channel? (Bluetooth interfering with Wi-Fi)

    • If not, is there a threshold number of Bluetooth interferers that causes performance degradation?

ICC 2012- Wireless Network Symposium - June 14th, 2012


Background2

Background

  • Will performance degrade with a larger channel interfering with a smaller channel? (Wi-Fi to Bluetooth interference)

ICC 2012- Wireless Network Symposium - June 14th, 2012


Background similar studies

Background: Similar Studies

  • Shuaib et al [2005]

    • Bluetooth  Wi-Fi  Internet

      • Wi-Fi performance somewhat dependent on Bluetooth performance

      • Also only looks at Wi-Fi performance

      • We aim to send Bluetooth and Wi-Fi traffic independent of each other simultaneously

      • We aim to investigate both Wi-Fi and Bluetooth performance

ICC 2012- Wireless Network Symposium - June 14th, 2012


Background similar studies1

Background: Similar Studies

  • Carfang et al [2008]

    • More focused on how mobility affects communication in the face of interference

  • Guoet al [2010]

    • Focused on error rates and signal strengths while we are concerned with throughput

ICC 2012- Wireless Network Symposium - June 14th, 2012


Background simulation interference models

Background: Simulation Interference Models

ICC 2012- Wireless Network Symposium - June 14th, 2012


Background interference avoidance techniques

Background: Interference Avoidance Techniques

  • In Bluetooth 1.2: Adaptive Frequency Hopping

    • Tries to sense what channel Wi-Fi is using and avoid those frequency ranges

    • What happens when Wi-Fi saturates the area as is common now?

  • Other techniques where Wi-Fi and Bluetooth chips communicate directly to avoid

    • What happens when using external Bluetooth adaptors, chips that do not support etc?

ICC 2012- Wireless Network Symposium - June 14th, 2012


Experiment setup

Experiment Setup

  • An equal number of Bluetooth and Wi-Fi devices

  • Located within a lab at the University of Guelph

ICC 2012- Wireless Network Symposium - June 14th, 2012


Laptop node

Laptop Node

ICC 2012- Wireless Network Symposium - June 14th, 2012


Methodology

Methodology

  • FTP file transfers between nodes

  • Input from /dev/random on Ubuntu 11.10

  • Wi-Fi file size was 10 megabytes

  • Bluetooth file size was 1 megabyte

  • Difference is because of the order of magnitude difference in link capacity so that a single transfer would finish roughly at the same time

ICC 2012- Wireless Network Symposium - June 14th, 2012


Methodology1

Methodology

  • Up to 6 laptops using each technology (6 Bluetooth and 6 Wi-Fi laptops)

  • Experiment performed late in the evening when few students use the campus Wi-Fi to decrease external interference

  • 30 Repetitions for each data point

  • Throughput is averaged across all nodes using particular technology

ICC 2012- Wireless Network Symposium - June 14th, 2012


Performance evaluation

Performance Evaluation

ICC 2012- Wireless Network Symposium - June 14th, 2012


Performance evaluation1

Performance Evaluation

ICC 2012- Wireless Network Symposium - June 14th, 2012


Discussion

Discussion

  • Bluetooth performance particularly is affected by Wi-Fi nodes in the region

    • Fig 2: 2, 3, 4 devices all show decreased performance due to interference

  • In some cases Wi-Fi nodes are also affected by Bluetooth interference

    • Fig 3: 3 devices

ICC 2012- Wireless Network Symposium - June 14th, 2012


Discussion1

Discussion

  • Decreased performance due to increased contention within the technology more to blame than interference between technologies, but still some effect

    • In future experiments, it may be best to vary the number of one type of node at a time to isolate the cause of decreased performance

ICC 2012- Wireless Network Symposium - June 14th, 2012


Conclusions future work

Conclusions & Future Work

  • Results show that Bluetooth is significantly affected by Wi-Fi interference within the same channel range

  • Result also showed limited cases of Wi-Fi being affected by Bluetooth interference

  • Results make the case that simulation tools should begin to support interference modelling between technologies

ICC 2012- Wireless Network Symposium - June 14th, 2012


Conclusions future work1

Conclusions & Future Work

  • In future experiments, vary number of nodes with a particular RAT while leaving other constant

  • Expand to include other RATs, ex Zigbee

  • Vary the distance, introduce mobility

  • Develop heterogeneous access schemes that avoid interference between RATs

ICC 2012- Wireless Network Symposium - June 14th, 2012


Thank you for attending

Thank you for Attending!

Questions?

Jason Ernst, University of Guelph

[email protected]

ICC 2012- Wireless Network Symposium - June 14th, 2012


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