% % This file was created by the TYPO3 extension % bib % --- Timezone: UTC % Creation date: 2024-11-21 % Creation time: 12-31-03 % --- Number of references % 7 % @Inproceedings { 2017-serror-ew-koi, title = {From Radio Design to System Evaluations for Ultra-Reliable and Low-Latency Communication}, year = {2017}, month = {5}, day = {17}, tags = {koi}, url = {https://www.comsys.rwth-aachen.de/fileadmin/papers/2017/2017-serror-radio-design-ew17.pdf}, publisher = {IEEE}, booktitle = {Proc. of 23rd European Wireless Conference (EW17), Dresden, Germany}, event_place = {Dresden, Germany}, event_name = {Proc. of 23rd European Wireless Conference (EW17)}, event_date = {17.-19. May 2017}, reviewed = {1}, author = {Ashraf, Shehzad Ali and Wang, Y.-P. Eric and Eldessoki, Sameh and Holfeld, Bernd and Parruca, Donald and Serror, Martin and Gross, James} } @Phdthesis { 2017-parruca-phdthesis, title = {Stochastic Optimization in OFDMA/LTE Networks}, year = {2017}, school = {RWTH Aachen University}, author = {Parruca, Donald} } @Conference { parruca_2014ICIC, title = {Semi-Static Interference Coordination in OFDMA/LTE Networks: Evaluation of Practical Aspects}, year = {2014}, month = {9}, day = {21}, abstract = {To minimize interference in LTE networks, several inter-cell interference coordination (ICIC) techniques have been in- troduced. Among them, semi-static ICIC offers a balanced trade-off between applicability and system performance. The power allocation per resource block and cell is adapted in the range of seconds according to the load in the system. An open issue in the literature is the question how fast the adaptation should be performed. This leads basically to a trade-off between system performance and feasible compu- tation times of the associated power allocation problems. In this work, we close this open issue by studying the impact that different durations of update times of semi-static ICIC have on the system performance. We conduct our study on realistic scenarios considering also the mobility of mobile terminals. Secondly, we also consider the implementation aspects of a semi-static ICIC. We introduce a very efficient implementation on general purpose graphic processing units, harnessing the parallel computing capability of such devices. We show that the update periods have a significant impact on the performance of cell edge terminals. Additionally, we present a graphic processing unit (GPU) based implementation which speeds up existing implementations up to a factor of 92x.}, keywords = {OFDMA; LTE; ICIC; Inter-Cell Interference Coordination; GPU; GA; Genetic Algorithm; 4G; Cellular Networks; In- terference; Proportional Fair Scheduling}, editor = {ACM}, publisher = {ACM}, booktitle = {Proceedings of the 17th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWIM-14)}, event_place = {Montreal, QC, Canada}, event_name = {International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWIM-14)}, event_date = {September 21-26 2014}, DOI = {http://dx.doi.org/10.1145/2641798.2641818}, reviewed = {1}, author = {Parruca, Donald and Aizaz, Fahad and Chantaraskul, Soamsiri and Gross, James} } @Article { parruca2014icc, title = {On the Interference As Noise Approximation in OFDMA/LTE Networks}, journal = {Proceedings of IEEE International Conference on Communications (ICC 2014)}, year = {2014}, month = {6}, day = {11}, url = {fileadmin/papers/2014/2014_parruca_gross.pdf}, misc2 = {Online}, language = {en}, reviewed = {1}, author = {Parruca, Donald and Gross, James} } @Conference { VTC2013_parruca_gross, title = {Analytical Model of Proportional Fair Scheduling in Interference-limited OFDMA/LTE Networks}, year = {2013}, month = {9}, abstract = {Various system tasks like interference coordination, handover decisions, admission control etc. in upcoming cellular networks require precise mid-term (spanning over a few seconds) performance models. Due to channel-dependent scheduling at the base station, these performance models are not simple to obtain. Furthermore, upcoming cellular systems will be interference-limited, hence, the way interference is modeled is crucial for the accuracy. In this paper we present an analytical model for the SINR distribution of the scheduled subcarriers of an OFDMA system with proportional fair scheduling. The model takes the precise SINR distribution into account. We furthermore refine our model with respect to uniform modulation and coding, as applied in LTE networks. The derived models are validated by means of simulations. In additon, we show that our models are approximate estimators for the performance of rate-based proportional fair scheduling, while they outperform some simpler prediction models from related work significantly.}, url = {https://www.comsys.rwth-aachen.de/fileadmin/papers/2013/2013_VTC_parruca.pdf}, booktitle = {Proceedings of IEE Vehicular Telecommunications Conference (VTC-Fall 2013)}, event_place = {Las Vegas, USA}, event_name = {2013 IEEE 78th Vehicular Technology Conference}, event_date = {2-5, September, 2013}, author = {Parruca, Donald and Grysla, Marius and G{\"o}rtzen, Simon and Gross, James} } @Proceedings { parruca_gross_2013, title = {Rate selection analysis under semi-persistent scheduling in LTE networks}, year = {2013}, month = {1}, day = {25}, pages = {1184,1190}, abstract = {Upcoming LTE networks have basically two different modes for scheduling data in the down-link by the base station. Dynamic scheduling brings the advantage of exploiting instantaneous channel state information while it puts on the other hand a significant burden on the system in terms of overhead and computation requirements. Especially for small packets that show up periodically, the overhead is typically too high. Therefore, the base station can serve such packet flows by the semi-persistent scheduling mode. In this mode, a certain resource allocation is fixed to a periodic schedule. While this does not allow any longer to exploit instantaneous channel states, it requires much less overhead. In this paper, we address the problem of selecting a modulation and coding scheme for such semi-persistent scheduling grants. The problem lies here in the stochastic characterization of the resource blocks over the next few seconds while on the other hand estimating based on such a characterization the blok error rate (and hence the average goodput). We provide a novel scheme, which outperforms all previously presented schemes significantly. The underlying model that we provide can also be used for any other long-term decision in an LTE system with semi-persistent scheduling such as interference coordination, handover decision etc.}, keywords = {Long Term Evolution;decision making;dynamic scheduling;error statistics;modulation;radio links;resource allocation;stochastic processes;wireless channels;LTE networks;base station;blok error rate;data scheduling;down-link;dynamic scheduling;instantaneous channel state information;long-term decision;modulation selection;packet flows;periodic scheduling;rate selection analysis;resource allocation;resource blocks;semi-persistent scheduling mode;stochastic characterization}, url = {www.performance.rwth-aachen.de/publications/conferences/2013ICNC_parruca.pdf}, web_url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6504261}, event_place = {San Diego, USA}, event_name = {International Conference on Computing, Networking and Communications (ICNC) 2013}, event_date = {28-31 January 2013}, language = {English}, ISBN = {978-1-4673-5287-1}, DOI = {10.1109/ICCNC.2013.6504261}, author = {Parruca, Donald and Gross, James} } @Conference { EW2013_parruca_gross, title = {On Semi-Static Interference Coordination under Proportional Fair Scheduling in LTE Systems}, year = {2013}, pages = {8}, abstract = {In this paper we consider the design of semi-static inter-cell interference coordination schemes for LTE networks. In this approach, base stations coordinate the power settings per resource block over long time spans such as seconds. In order to optimize the power settings, one needs to employ models which predict the rate of terminals over the next coordination period under the usage of a given power setting. However, these models are typically quite simple and neglect the impact from fading as well as from dynamic resource allocation performed at the base stations on a millisecond basis. Ignoring such properties of OFDMA networks leads therefore to suboptimal transmit power settings. In this paper, we study the impact from a precise rate prediction model that accurately accounts for fading and dynamic resource allocation. On the down-side, this more precise model leads to a much more involved optimization problem to be solved once per coordination period. We propose two different heuristic methods to deal with this problem. Especially the usage of genetic algorithm results to be promising to counteract the complexity increase. We then study the overall system performance and find precise rate prediction models to be essential for semi-static interference coordination as they provide significant performance improvements in comparison to approaches with simpler models.}, keywords = {ICIC, proportional fair scheduling, power mask, resource block, scheduling, dynamic scheduling, inter cell interference coordination, LTE, OFDMA, WiMAX}, url = {https://www.comsys.rwth-aachen.de/fileadmin/papers/2013/2013_ICIC_parruca_grysla_gross.pdf}, web_url = {http://www.vde-verlag.de/proceedings-en/563498043.html}, editor = {vde-verlag}, publisher = {vde-verlag}, address = {http://www.vde-verlag.de/}, booktitle = {Proceedings: European Wireless 2013}, event_place = {Guildford, UK}, event_name = {2013 - 19th European Wireless Conference}, event_date = {04/16/2012 - 04/18/2013}, language = {English}, author = {Parruca, Donald and Grysla, Marius and M{\"a}h{\"o}nen, Petri and Petrova, Marina and Zhou, Han and Naghibi, Farshad and Gross, James} }