Browsing by Author "Sousa, Sofia C."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Insights on Spectrum Sharing in Heterogeneous Networks with Small CellsPublication . Silva, Bruno C.; Sousa, Sofia C.; Teixeira, Emanuel; Velez, FernandoThis work explores the viability of 5G New Radio spectrum sharing in Ultra High Frequency (UHF), Super High Frequency (SHF) and millimetre wavebands(mmWaves) in outdoor environments. In the mmWaves the linear cellular topology is considered while in the UHF/SHF bands cells with hexagonal shape are assumed. Performance evaluation includes the study of the behaviour of PHY and supported throughput for 2.6, 3.5, 28, 38, 60 and 73 GHz. While the two-slope model is considered for the 2.6 and 3.5 GHz frequency bands, the modified Friis propagation model, with shadow fading, and different values for the standard deviation, is the considered in the millimeter wavebands. With sharing, lower system capacity is supported. We clearly observe that, for coverage distances up to circa 100 m, the supported throughput is higher at the millimetre wavebands, mainly due to the reduction that characterizes the application of the two-slope propagation model at the UHF/SHF bands.
- Scenarios and Architectures for RRM and Optimization of Heterogenous NetworksPublication . Sousa, Sofia C.; Velez, Fernando J.; Huq, Kazi; Mumtaz, Shahid; Rodrigues, JonathanThis work summarizes the state of the art information related to scenarios and architectures from Energy-efficient High-speed Cost Effective Cooperative Backhaul for LTE/LTE-A Small-cells (E-COOP) technologies. One of the proposed architectures exploits infrastructure based on small cell deployment using RRU technology which is connected to the core network using backhaul technology based on fibre optic links. In E-COOP, we go beyond this by addressing four key scenarios in terms of fronthaul deployment strategy (scenario 1) for C-RAN and carrier aggregation (scenario 2). The third scenario exploits the C-RAN architecture to firstly split the control/ data plane where the macro base station improves the signalling service for the whole area. Also, mobile small cells (SCs) are cooperatively specialized towards delivering data services for high-rate transmission with light overhead control and appropriate air interface (mmWave) – scenario 3. This raises significant research challenges in terms of mobile small cell coexistence, and mobility management. In scenario 4, we consider SON in LTE-A for HetNets with ultra-dense small cell deployment with imperfect backhaul. A Primary Network is considered that is overlaid with a cognitive network of Small Cell Networks, performing local sensing and local self-configuration and -optimization algorithms.