Visiting Lecture by Professor Jens Zander KTH

Thursday, November 22, 2012

Visiting Lecture: "Will it Scale ? - on the commercial feasibility of secondary spectrum access"

By Professor Jens Zander from the KTH – The Royal Institute of Technology, Stockholm, Sweden

on Thursday 22 November at 15.15-16.00 in TS 128


Dynamic spectrum sharing has been proposed as one of the prime candidate technologies to solve the apparent spectrum scarcity problem below 6 GHz as suggested by recent wireless traffic predictions. Earlier spectrum measurements have shown that the spectrum occupancy is in general low. Subsequent research has focused on finding ways to use (seemingly) unused parts of the spectrum, so called "white spaces" in the temporal or spatial domain. The main thrust in the literature has been on designing different schemes for opportunistically detecting such "white spaces" and subsequently using them on a secondary basis. However, large-scale commercial success requires that secondary systems are also scalable,  such that a large number of users can be served in economically viable fashion.

In this talk we report results from the recently finished QUASAR-project, which has been studying overall system aspects of cognitive radio technologies and has paid attention particularly to the economic viability of different use cases. We find that successful secondary sharing goes far beyond the detection of "spectrum holes". In the talk we review results from our techno-economic studies of some of the commercially most interesting scenarios. The results show, among other things, that secondary use of TV Spectrum is  not commercially attractive for wide-area mobile broadband access,  neither from a business nor technical perspective. The likely commercial "sweet spot" for secondary sharing is short-range, indoor communications both in the TV bands but also in radar bands. We also find that regulation is currently not a  significant barrier neither in Europe nor in the US.

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Last updated: 9.11.2012