Uplink Transmission Control Methods in LSA-Enabled Cellular Networks
Ponomarenko-Timofeev, Aleksei (2019)
Informaatioteknologian ja viestinnän tiedekunta – Faculty of Information Technology and Communication Sciences
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As of now, multiple approaches to increasing network throughput are being studied. For instance, mmWave communications are expected to deliver increase in network throughput to 7 Gbps over 60 and 28 GHz. As a consequence of increasing frequency, the range of communication decreases, but new possibilities arise, such as directional transmissions. Another approach is offloading traffic onto neighbors in case they are connected to a faster link. In case of mobile devices it leads to decreased battery lifetime and increase of power consumption. Another approach is reusing stale bands that were reserved for services that are obsolete and/or defunct. However, there are cases when stale bands are allocated to services that are not defunct, but their activity is low. In this case, it is impossible to reallocate the bands. Despite that, it is still possible to use these bands by using LSA approach by sharing bands between the original owner (incumbent) and licensee. Licensee will need to satisfy the terms of the licensed sharing by keeping the interference power below the threshold and vacating the bands when latter are requested by incumbent. Hence, we must not use shared bands for delay-sensitive traffic or mission-critical services. One possible application of LTE LSA is non-critical IoT devices that are linked to the power grid (weather stations). Therefore, we should balance between satisfying license agreement terms and keeping the network operational. We also need to realize that LSA approach can be applied in cases when location of the incumbent changes rapidly. In this work, power control methods developed for LSA-enabled cellular networks are given. These methods were built for dynamic LSA scenarios, when position of the incumbent changes rapidly and licensee has to readjust power limits on the infrastructure. Aside from that, some minor improvements that were done to the algorithms are described, as well as practical operation example is shown.