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This paper describes the results from a series of long-term observations of spectrum occupancy in the range 300 MHz–4.9 GHz made at a single location. Over 6 months of data has been gathered from a measurement system that is designed to operate continuously, allowing a full picture of spectrum occupancy to be built up. The large amount of data captured permits analysis to identify the portions of spectrum that are occupied non-continuously (i.e. with a duty cycle of less than 100%); these channels might be most suitable for use by a cognitive radio (CR) system that is able to identify temporary spectrum holes and then exploit them. The aim of performing a comprehensive analysis of channel occupancy and its variability is to improve the potential for smart spectrum access by CR devices, by informing their choices concerning the particular portions of spectrum to scan, and how frequently. Results allow measurement channels to be categorised according to their duty cycle; spectrum with a duty cycle between 10% and 90% is considered to be particularly suitable and is found in the regions below 500 MHz and between 1 GHz and 1.2 GHz. A predictable pattern of time occupancy is discovered, caused by variable activity in the portions of spectrum allocated to cellular systems. The characteristics of the occupancy duty cycle according to the time of day is also investigated; some frequencies are shown to exhibit considerable variation of occupancy depending on the hour of observation. A subset of channels is selected for more detailed investigation including short-term variations in channel occupancy.
|Translated title of the contribution||Long-term Measurements of Spectrum Occupancy Characteristics|
|Title of host publication||2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySpan). Aachen, Germany|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||83 - 89|
|ISBN (Print)||9781457701771, 9781457701764|
|Publication status||Published - May 2011|
|Event||IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks - Aachen, Germany|
Duration: 3 May 2011 → 6 May 2011
|Conference||IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks|
|Period||3/05/11 → 6/05/11|
Bibliographical noteConference Organiser: IEEE
Rose publication type: Conference contribution
Sponsorship: This work is being carried out jointly by University of Bristol and Toshiba Research Europe Telecommunications Research Laboratory (TRL) under the Engineering and Physical Sciences Research Council (EPSRC) Knowledge Transfer Secondment scheme. Thanks are due to the directors of TRL for allowing the publication of this work and to Mr Ken Stevens for his invaluable contribution to the construction of the measurement system.
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- spectrum occupancy
- 300 MHz–4.9 GHz