scholarly journals System-Level Performance of C-NOMA: A Cooperative Scheme for Capacity Enhancements in 5G Mobile Networks

2017 ◽  
Author(s):  
Andrea S. Marcano ◽  
Henrik L. Christiansen
Keyword(s):  
Mobile Networks ◽  
System Level ◽  
Cooperative Scheme ◽  
Level Performance ◽  
5G Mobile Networks

WiSE: A System-Level Simulator for 5G Mobile Networks

2018 ◽  
Vol 25 (2) ◽  
pp. 4-7 ◽  
Author(s):  
Chin-Kuo Jao ◽  
Chun-Yen Wang ◽  
Ting-Yu Yeh ◽  
Chun-Chia Tsai ◽  
Li-Chung Lo ◽  
...  
Keyword(s):  
Mobile Networks ◽  
System Level ◽  
5G Mobile Networks

Incentive and Architecture of Multi-Band Enabled Small Cell and UE for Up-/Down-Link and Control-/User-Plane Splitting for 5G Mobile Networks

Frequenz ◽  
2017 ◽  
Vol 71 (1-2) ◽  
pp. 95-118 ◽  
Author(s):  
Rony Kumer Saha ◽  
Chaodit Aswakul
Keyword(s):  
Mobile Networks ◽  
Spectral Efficiency ◽  
Base Station ◽  
System Level ◽  
Control Plane ◽  
Microwave Band ◽  
Split Architecture ◽  
And Control ◽  
5G Mobile Networks ◽  
Multi Band

Abstract In this paper, a multi-band enabled femtocell base station (FCBS) and user equipment (UE) architecture is proposed in a multi-tier network that consists of small cells, including femtocells and picocells deployed over the coverage of a macrocell for splitting uplink and downlink (UL/DL) as well as control-plane and user-plane (C-/U-plane) for 5G mobile networks. Since splitting is performed at the same FCBS, we define this architecture as the same base station based split architecture (SBSA). For multiple bands, we consider co-channel (CC) microwave and different frequency (DF) 60 GHz millimeter wave (mmWave) bands for FCBSs and UEs with respect to the microwave band used by their over-laid macrocell base station. All femtocells are assumed to be deployed in a 3-dimensional multi-storage building. For CC microwave band, cross-tier CC interference of femtocells with macrocell is avoided using almost blank subframe based enhanced inter-cell interference coordination techniques. The co-existence of CC microwave and DF mmWave bands for SBSA on the same FCBS and UE is first studied to show their performance disparities in terms of system capacity and spectral efficiency in order to provide incentives for employing multiple bands at the same FCBS and UE and identify a suitable band for routing decoupled UL/DL or C-/U-plane traffic. We then present a number of disruptive architectural design alternatives of multi-band enabled SBSA for 5G mobile networks for UL/DL and C-/U-plane splitting, including a disruptive and complete splitting of UL/DL and C-/U-plane as well as a combined UL/DL and C-/U-plane splitting, by exploiting dual connectivity on CC microwave and DF mmWave bands. The outperformances of SBSA in terms of system level capacity, average spectral efficiency, energy efficiency, and control-plane overhead traffic capacity in comparison with different base stations based split architecture (DBSA) are shown. Finally, a number of technical and business perspectives as well as key research issues of SBSA are discussed.

scholarly journals End-to-end Network Slicing for 5G Mobile Networks

2017 ◽  
Vol 25 (0) ◽  
pp. 153-163 ◽  
Author(s):  
Akihiro Nakao ◽  
Ping Du ◽  
Yoshiaki Kiriha ◽  
Fabrizio Granelli ◽  
Anteneh Atumo Gebremariam ◽  
...  
Keyword(s):  
Mobile Networks ◽  
Network Slicing ◽  
End To End ◽  
5G Mobile Networks

scholarly journals Misalignment in Gas Foil Journal Bearings: An Experimental Study

2008 ◽  
Author(s):  
Samuel A. Howard
Keyword(s):  
Journal Bearings ◽  
System Level ◽  
Design Parameters ◽  
Foil Bearing ◽  
Alignment System ◽  
Successful Design ◽  
Shaft Alignment ◽  
Bearing Force ◽  
Management Schemes ◽  
Level Performance

As gas foil journal bearings become more prevalent in production machines, such as small gas turbine propulsion systems and microturbines, system level performance issues must be identified and quantified in order to provide for successful design practices. Several examples of system level design parameters that are not fully understood in foil bearing systems are thermal management schemes, alignment requirements, balance requirements, thrust load balancing, and others. In order to address some of these deficiencies and begin to develop guidelines, this paper presents a preliminary experimental investigation of the misalignment tolerance of gas foil journal bearing systems. Using a notional gas foil bearing supported rotor and a laser-based shaft alignment system, increasing levels of misalignment are imparted to the bearing supports while monitoring temperature at the bearing edges. The amount of misalignment that induces bearing failure is identified and compared to other conventional bearing types such as cylindrical roller bearings and angular contact ball bearings. Additionally, the dynamic response of the rotor indicates that the gas foil bearing force coefficients may be affected by misalignment.

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