NDLI: Spectrum load smoothing for cognitive medium access in open spectrum

Content Provider	IEEE Xplore Digital Library
Author	Berlemann, L. Mangold, S. Hiertz, G.R. Walke, B.H.
Copyright Year	2005
Description	Author affiliation: Chair of Commun. Networks, RWTH Aachen Univ. (Berlemann, L.)
Abstract	Today's framework for radio spectrum regulation and the way the usage of radio spectrum is coordinated, is undergoing vital changes. In the face of scarce radio resources, regulators, industry, and the research community are initiating promising approaches towards a more flexible spectrum usage, referred to as open spectrum. In this paper we discuss medium access control protocols for spectrum agile radios that opportunistically use spectrum, also referred to as "cognitive radio". Spectrum agile radios operate in parts of the spectrum originally licensed to other radio services. They identify free spectrum, coordinate its usage and release it when this is required by licensed radio systems. The application of "waterfilling" from the information theory, referred to as spectrum load smoothing (SLS), and its realization in IEEE 802.11e-based spectrum agile wireless networks is examined in this paper. The SLS, as intelligent principle of spectrum usage, targets at the distributed quality-of-service support in scenarios of coexisting spectrum agile radios. With SLS, spectrum agile radios observe the past usage of the spectrum, while at the same time a harmful interference to license holding radio systems is avoided. The SLS can therefore be referred to as cognitive medium access. In this paper, the capability to support quality-of-service in the presence of other, competing spectrum agile networks and the protection of licensed radio networks are evaluated with the help of simulation. The efficiency of SLS for open spectrum access is demonstrated
Starting Page	1951
Ending Page	1956
File Size	4903086
Page Count	6
File Format	PDF
ISBN	9783800729098
DOI	10.1109/PIMRC.2005.1651781
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-11
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Smoothing methods Laser sintering Quality of service Regulators Media Access Protocol Access protocols Cognitive radio Information theory Wireless networks Interference IEEE 802.11e Open Spectrum Cognitive Radio Spectrum Load Smoothing
Content Type	Text
Resource Type	Article

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