Lab: Communication Systems
Contact Person: Cicek Cavdar( cavdar@kth.se
)
Starting date : Immediately
Up to now, wireless access networks have been designed to guarantee a certain level of QoS at any time, paying no attention for energy consumption. This has created an over-provisioning situation where most of the time the supplied amount of energy is much higher than required due to inadequate traffic adaption. Traffic measurements in real networks show that more than
80% of the base stations don’t carry any traffic in millisecond level time frame even during busy hour [1, 2]. This is due to the fact that high QoS required applications limits the average resource utilization in order to reduce the interference. This indicates a significant potential via discontinuous transmission (DTX), i.e., micro sleep, at the BS side. The idea behind micro sleep is to take benefit from the specifics of LTE signals and lower the baseline power consumption of the BS by applying sleep modes on dedicated components during the time blocks that are fully devoted to data transmission when there is no traffic. Another way forward to decrease power consumption in Macro only deployment is Heterogeneous Networks.
This thesis project aims to i) assess the potential energy savings with micro-sleep considering daily traffic variation both in urban and rural areas in Heterogeneous Networks, ii) investigate how does various network densification strategies(macro only, indoor and outdoor small cell deployment under macro-cellular coverage) that can cope with the massive demand in 2020 impacts the energy savings through micro sleep technique. To this end, first the fluctuation of the daily traffic will be modeled in various environments. Then resource utilization of a given network deployment will be calculated via a mathematical model that is verified by simulations.
Finally, the energy efficiency of selected potential network deployment strategies for 2020 will be assessed considering traffic adaptive micro-sleep technique. The results will be compared with the case where micro-sleep is not implemented.
Type of Project: Simulation, and analysis.
Required background: Wireless networks or equivalent, good background in system level simulation is preferred.
[1] P. Frenger, at, al., “Reducing Energy Consumption in LTE with Cell DTX," in Proc. of IEEE
Vehic. Technol. Conf. (VTC Spring), Budapest, Hungary, 2011.
[2] A. Ambrosy, at, al., "Energy saving potential of integrated hardware and resource management solutions for wireless base stations," in Proc. of IEEE PIMRC, Toronto, 2011.