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  • Radio Resource Management of Heterogeneous Small Cell Networks
    Publication . Paulo, Rui Filipe Rosa; Velez, Fernando José da Silva
    While mobile communication users demand new high speed services with enhanced quality, there will always be a need to optimize cellular networks. This work explores the behavior of indoor and outdoor small cells while reducing the cell size to increase system capacity in both links. After justifying evolution of the use of small cells, the concepts of ultra-dense networks and heterogeneous networks toward 5G are then presented. In the initial part of this work, we have chosen a 3GPP 5x5 grid geometry for indoor scenarios. The average signal-to-interference-plus-noise ratio (SINR) has been studied for reuse pattern two and two types of deployment topologies, one with 25 HeNBs and another with 4 HeNBs. We have also addressed the exponential effective SINR mapping (EESM) by extending the study for topologies with 5 and 6 HeNBs. Based on an improved version of LTE-Sim, network performance has been evaluated in terms of the goodput, packet loss ratio (PLR), delay, and the maximum number of supported users. We have evaluated the performance by considering 4, 5, 6 and 25 HeNBs. Results complied with the 3GPP recommendations for PLR and delay. One observed that system capacity is higher for topologies with 25 HeNBs, followed by topologies with 6 HeNBs and 4 HeNBS, and then the indoor deployments with 5 HeNBs. Different packet schedulers have been considered. Results have shown that, with the considered applications and schedulers, it is possible to reduce the transmitter power of HeNBs without compromising the small cell network performance. In the final part of the work an urban micro line-of-sight cell scenario has been studied by comparing the 2.6 GHz, 3.5 GHz, and 5.62 GHz frequency bands while considering the ITU-R M.2135-1 dual slope path loss model (DS-PLM) in the system level simulations. Results have been obtained for different values of the cell radius. System capacity has been determined by considering the 3GPP quality target of 2% for video applications. For all schedulers and frequency bands, for cell radius shorter than the breakpoint distance, the PLR increases when the cell radius decreases. [...]
    2022-10-26Doctoral thesis Open access Show more