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Unused spectrum

Figure 5: Region served with voice and data services by COTECAL, in Calafate and El Chalten, ArgentinaFigure 5: Region served with voice and data services by COTECAL, in Calafate and El Chalten, Argentina

Spectrum allocated to broadcast television is only partially used. In particular, in developing countries. This presents a magnificent opportunity to introduce wireless data networking services in channels that are not currently in use, and to start reaping the benefits of TV white spaces in a more benign environment, where the kind of spectrum sensing and agile frequency changing required to share the crowded spectrum in wealthy countries may not be necessary.

Successful deployment of Code Division Multiple Access (CDMA) mobile systems in the 450 MHz band (in the middle of TV allocated frequencies) has demonstrated the value of lower frequencies for two-way data communications, e.g. in rural areas such as the Argentinean state of Patagonia, which is currently served by “Cooperativa Telefónica de Calafate-COTECAL”. COTECAL offering voice and data services to customers at distances up to 50 km from the Base Station, in the beautiful area shown in the figure.

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