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Distributed Quality-of-Service Support in Cognitive Radio by Berlemann L.

Posted On February 25, 2017 at 6:51 am by / Comments Off on Distributed Quality-of-Service Support in Cognitive Radio by Berlemann L.

By Berlemann L.

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Extra resources for Distributed Quality-of-Service Support in Cognitive Radio Networks

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Additionally, FCC reserved in 1997 300 MHz and in 2003 255 MHz at 5 GHz for unlicensed operation. This frequency band at 5 GHz is referred to as U-NII band. Contrary to the ISM bands, the usage of the U-NII bands is more restricted: There, limited coexistence capabilities like DFS and TPC, as introduced below, are mandatory (FCC, 2003a). As TV bands in the US are often under-utilized, the FCC proposed in 2004 to allow unlicensed systems the secondary usage of this spectrum (FCC, 2004b). 2. 20 2.

5 MHz band are described in (ERC, 2001): The Equivalent Isotropic Radiated Power (EIRP) is limited there to 100 mW. Further, for Direct Sequence Spread Spectrum (DSSS), the maximum spectrum power density is limited to -20 dBW/1 MHz and for Frequency Hopping Spread Spectrum (FHSS) the maximum spectrum power density is limited to -10 dBW/100 kHz. The operation in the 5 GHz frequency bands is regulated in (ECC, 2004): The 5150-5350 MHz band is designated for indoor usage with a mean EIRP of 200 mW and DFS together with TPC are required above 5250 MHz.

A definition of these terms is given therefore in the following, as these terms are especially important in the context of QoS support. Means for coexistence target at interference avoidance in a distributed communication environment. Consequently, no communication among coexisting devices is required and possible. In case of a less utilized shared spectrum, coexistence capabilities suffice to enable a reliable communication. In the recent years, coexistence has been very successful but is now victim of its own success: Two many often dissimilar radio systems are coexisting in the unlicensed frequency bands like Wi-Fi and Bluetooth.

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