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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

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

jernst@uoguelph.ca

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