By Berlemann L.
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Extra resources for Distributed Quality-of-Service Support in Cognitive Radio Networks
Example text
The DIMSUMnet is concreted in (Buddhikot and Ryan, 2005) through the investigation of candidate algorithms for dynamic spectrum access in cellular Code Division Multiple Access (CDMA) networks. , 2003). There, the idea of a knowledge plane is suggested that is separated from the control- and data-plane. This knowledge plane enables the cognitive network to autonomously identify a problem and fix it with selfconfiguration. Based on this, Mähönen (2004) and Mähönen et al. (2004) suggest to take wireless networks and telephony into account from the beginning, when designing a knowledge plane for cognitive radio networks.
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. 4: Spectrum for unlicensed operation in the US and recent initiatives of the FCC to free spectrum with a reference on the corresponding document. In 2004, the FCC also initiated the opening of new spectrum for wireless broadband communication in the 3650-3700 MHz band for fixed and mobile devices transmitting at higher power (FCC, 2004a).
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.