Opportunistic spectral usage: Bounds and a multi-band CSMA/CA protocol

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Opportunistic spectral usage: Bounds and a multi-band CSMA/CA protocol (2006)

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by Ashutosh Sabharwal , Ahmad Khoshnevis , Edward Knightly

Venue:	IEEE/ACM Transactions on Networking
Citations:	63 - 1 self

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@ARTICLE{Sabharwal06opportunisticspectral,
    author = {Ashutosh Sabharwal and Ahmad Khoshnevis and Edward Knightly},
    title = {Opportunistic spectral usage: Bounds and a multi-band CSMA/CA protocol},
    journal = {IEEE/ACM Transactions on Networking},
    year = {2006},
    volume = {2006},
    pages = {533545}
}

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Abstract

Abstract — In this paper, we study the gains from opportunistic spectrum usage when neither sender or receiver are aware of the current channel conditions in different frequency bands. Hence to select the best band for sending data, nodes first need to measure the channel in different bands which takes time away from sending actual data. We analyze the gains from opportunistic band selection by deriving an optimal skipping rule, which balances the throughput gain from finding a good quality band with the overhead of measuring multiple bands. We show that opportunistic band skipping is most beneficial in low signal to noise scenarios, which are typically the cases when the node throughput in single-band (no opportunism) system is the minimum. To study the impact of opportunism on network throughput, we devise a CSMA/CA protocol, Multiband Opportunistic Auto Rate (MOAR), which implements the proposed skipping rule on a per node pair basis. The proposed protocol exploits both time and frequency diversity, and is shown to result in typical throughput gains of 20% or more over a protocol which only exploits time diversity, Opportunistic Auto Rate (OAR). I.

Keyphrases

multi-band csma ca protocol opportunistic spectral usage good quality band optimal skipping rule actual data opportunistic band skipping low signal multiband opportunistic auto rate current channel condition csma ca protocol different frequency band opportunistic auto rate time diversity opportunistic spectrum usage skipping rule opportunistic band selection throughput gain per node pair basis frequency diversity multiple band different band typical throughput gain node throughput network throughput

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