scholarly journals ASR - Adaptive Similarity-Based Regressor for Uplink Data Rate Estimation in Mobile Networks

2020 ◽  
Vol 38 (10) ◽  
pp. 2284-2294 ◽  
Author(s):  
Georgi Nikolov ◽  
Michael Kuhn ◽  
Alan McGibney ◽  
Bernd-Ludwig Wenning
Keyword(s):  
Mobile Networks ◽  
Data Rate ◽  
Rate Estimation

scholarly journals Mitigation of Nonlinear Distortions for a 100 Gb/s Radio-Over-Fiber-Based WDM Network

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1796 ◽  
Author(s):  
Saifur Rahman ◽  
Farman Ali ◽  
Adrian Smagor ◽  
Fazal Muhammad ◽  
Usman Habib ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Mobile Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Data Rate ◽  
Radio Over Fiber ◽  
Limiting Factors ◽  
Modulation Formats ◽  
Transmission Distance ◽  
Nonlinear Distortions

Next-generation cloud radio access networks (C-RANs) are anticipated to provide multi-Gbps data rate transmission and ultra-high bandwidth capacity, which is one of the key performance indicators for future mobile networks. The integral layout of fiber optics and radio network manages the capabilities of the C-RAN, but needs to be optimized in terms of cost, reliability and further scalibility. For C-RAN architectures, Radio over Fiber (RoF) transport-based fronthaul is a promising candidate but the associated issues of distortions due to nonlinear impairments (NLIs) from power amplifier, linear distortions (LDs) due to modulating lasers and high peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals need to be addressed. This work investigates these performance limiting factors and presents a DSP receiver-based solution to mitigate the effects of NLIs, LDs and high PAPR. Simulations are performed by applying a various range of transmission input powers, different quadrature amplitude modulation (QAM) formats for the OFDM signal, optimized filtering at the receiver end and varying channel spacing among the optical WDM channels to analyze the performance of the proposed receiver under different conditions. The simulations and theoretical model of the proposed case studies verify that the presented solution for the RoF transport utilize less power, performs better for longer transmission distances, supports higher modulation formats and transports large number of WDM channels in the presence of NLIs and DLs as compared to the conventional RoF approach. With compensation of NLIs and LDs, transmission distance up to 10 km is investigated using 16 WDM channels with aggregate data rate of 100 Gb/s which shows that the proposed receiver can be used for future C-RAN fronthaul networks.

Delay Tolerant Network Protocols in a Railway Network

2021 ◽  
Vol 12 (4) ◽  
pp. 1-17
Author(s):  
Eugene Tikhonov ◽  
Donat Schneps-Schneppe ◽  
Dmitry Namiot
Keyword(s):  
Communication Network ◽  
Mobile Networks ◽  
Moving Objects ◽  
Network Protocols ◽  
Data Rate ◽  
Delay Tolerant Network ◽  
Network System ◽  
Railway Network ◽  
Railway Line ◽  
Delay Tolerant

The paper is devoted to the analysis of the effectiveness of the DTN (delay tolerant network) system in a communication network on a railway line. Trains act as moving objects that are sending and receiving messages to/from an external network. Trains may also transmit telemetry collected during movement. The article presents data on the effectiveness of the DTN network with various protocols in terms of reducing the delay in the message and telemetry delivery and in increasing the total number of delivered messages in the railway scenario. An analysis of railway lines with various loads and different coverage of mobile networks was made. These models are based on real railway maps and train schedules. The effectiveness of DTN during migration to networks of a higher data rate (5G) and networks with satellite connection of trains is discussed.

Very High Data Rate Support for Mobile Cloud Services Using SDN-Based Heterogeneous Carrier Aggregation

2014 ◽  
Vol 24 (07) ◽  
pp. 983-1011
Author(s):  
Dong Ha Kim ◽  
Cheolhoon Kim ◽  
Yumi Oh ◽  
Sungwon Lee ◽  
Seung Gwan Lee
Keyword(s):  
Cloud Computing ◽  
Mobile Devices ◽  
Mobile Networks ◽  
Data Transfer ◽  
Cost Effective ◽  
Data Rate ◽  
Cloud Services ◽  
Carrier Aggregation ◽  
Radio Access ◽  
5G Mobile Networks

Mobile traffic is currently the most important traffic on the Internet, both domestically and internationally. This is predominantly attributable to widespread cloud computing-based services on mobile networks. Fifth generation (5G) mobile networks are expected to comfortably accommodate this type of traffic by supporting 1,000 times faster speeds than conventional 4G. However, commercial implementation of 5G mobile is targeted for the year 2020. Therefore, interim accommodation approaches are needed. In essence, 5G mobile networks are an evolution of 4G in which a licensed spectrum that generates revenue from user data transfer is being considered. Consequently, more cost-effective methods that utilize the unlicensed spectrum are also desired. Meanwhile, concomitant with pursuit of miniaturization and reduction in weight, the number and types of network interfaces in recent mobile devices are increasing. We propose a method for carrier aggregation of multiple heterogeneous wireless links based on software-defined networking (SDN) that controls traffic and manages the wireless interfaces of mobile devices effectively when multiple radio access technologies are available. Evaluations conducted of the proposed method on an experimental testbed developed using the OpenStack cloud computing platform with aggregated multiple radio access technology environments indicate that it is feasible and provides higher data rate.

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