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Cognitive repeaters for flexible mobile data traffic offloading

: Wieruch, D.; Wirth, T.; Braz, O.; Dußmann, A.; Mederle, M.; Müller, M.


Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering -ICST-, Brussels:
8th International Conference on Cognitive Radio Oriented Wireless Networks, CROWNCOM 2013 : Washington, DC, USA, 8 - 10 July 2013
Piscataway, NJ: IEEE, 2013
ISBN: 978-1-4799-2120-1 (online)
ISBN: 978-1-4799-2122-5 (print)
ISBN: 978-1-936968-83-1
ISBN: 978-1-4799-2121-8 (USB)
International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM) <8, 2013, Washington/DC>
Fraunhofer HHI ()

We investigate the performance of cognitive amplify-and-forward (AF) repeaters in a dense urban environment. The benefit of repeaters is twofold. First, repeaters can compensate penetration losses and serve as wireless backhauling technology to bring high data rates into shielded environments. Second, a cognitive repeater can utilize very flexible different frequency bands and adopt its wireless link to the current frequency reuse plan. In this paper, we propose a new cognitive repeater concept which utilizes multiband signal offloading. Therefore, a cognitive repeater is implemented as a real-time hardware prototype in an amplify-and-forward (AF) relay and deployed in a real LTE-A testbed. The system performance is evaluated by various measurement trials within shielded indoor hotspot environments. It is shown, that cognitive repeaters can take advantage of the signal shielding to the outside and beneficially improve system performance for indoor user hotspots.