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Primary user behavior in cellular networks and implications for dynamic spectrum access

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4 Author(s)
Willkomm, D. ; Tech. Univ. Berlin, Berlin ; Machiraju, S. ; Bolot, J. ; Wolisz, A.

Dynamic spectrum access approaches, which propose to opportunistically use underutilized portions of licensed wireless spectrum such as cellular bands, are increasingly being seen as a way to alleviate spectrum scarcity. However, before DSA approaches can be enabled, it is important that we understand the dynamics of spectrum usage in licensed bands. Our focus in this article is the cellular band. Using a unique dataset collected inside a cellular network operator, we analyze the usage in cellular bands and discuss the implications of our results on enabling DSA in these bands. One of the key aspects of our dataset is its scale-it consists of data collected over three weeks at hundreds of base stations. We dissect this data along different dimensions to characterize if and when spectrum is available, develop models of primary usage, and understand the implications of these results on DSA techniques such as sensing.

Published in:

Communications Magazine, IEEE  (Volume:47 ,  Issue: 3 )

Date of Publication:

March 2009

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