Effects of physical channel separation on application flows in a multi-radio multi-hop wireless mesh network: an experimental study on BilMesh testbed

Date
2014
Authors
Ulucinar, A. R.
Korpeoglu, I.
Karasan, E.
Advisor
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Instructor
Source Title
Journal of Network and Computer Applications
Print ISSN
1084-8045
Electronic ISSN
Publisher
Academic Press
Volume
39
Issue
Pages
253 - 265
Language
English
Type
Article
Journal Title
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Volume Title
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Abstract

In this paper, we introduce BilMesh, an indoor 802.11 b/g mesh networking testbed we established, and we report about our performance experiments conducted on multi-hop topologies with single-radio and multi-radio relay nodes. We investigate and report the effects of using multi-radio, multi-channel relay nodes in the mesh networking infrastructure in terms of network and application layer performance metrics. We also study the effects of physical channel separation on achievable end-to-end goodput perceived by the applications in the multi-radio case by varying the channel separation between the radio interfaces of a multi-radio relay node. We have observed that the difference between TCP and UDP goodput performances together with the delay and jitter performance depends on the hop count. We also observed that assigning overlapping channels with a central frequency separation of 5-15 MHz may render the CSMA mechanism used in 802.11 MAC ineffective and hence reduce the overall network performance. Finally, we provide some suggestions that can be considered while designing related protocols and algorithms to deal with the observed facts.

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Keywords
802.11, CSMA, Multi-radio nodes, TCP, UDP, Multi-hop topologies, Multi-hop wireless mesh networks, Multi-radio, Networking infrastructure, Performance experiment, Carrier sense multiple access, MESH networking, Network layers, Testbeds, Transmission control protocol
Citation
Published Version (Please cite this version)