scholarly journals What 5G has been and what should 5G+ be?

2021 ◽  
Vol 8 (1) ◽  
pp. 27-38
Author(s):  
Zoran Bojkovic ◽  
Dragorad Milovanovic ◽  
Tulsi Pawan Fowdur ◽  
Mussawir Ahmad Hosany
Keyword(s):  
Mobile Networks ◽  
Mobile Communications ◽  
Performance Enhancement ◽  
Performance Targets ◽  
Technology Roadmap ◽  
Industrial Organizations ◽  
Gradual Evolution ◽  
5G Network ◽  
And Performance ◽  
Two Stages

In this work we aim to provide a comprehensive summary of the most inspiring aspects of 5G mobile networks. In addition, we present the latest findings on the promising 6G technology towards a world of fully digital connectivity. The key determinants are extreme system performance and combinations of requirements for new use cases. We study new performance targets beyond 5G in two stages: 5G+ evolution and new 6G step. Relevant technologies considered too immature for 5G or outside the defined scope are outlined. To justify our vision of future mobile networks, we point out the need for closer collaborations of academia, standardizing bodies, industrial organizations and governments. The contribution strategy is gradual evolution and performance enhancement of mobile communications. Finally, we identify challenges and directions on network technology roadmap toward 6G. Keywords: wireless communication, mobile broadband, low-latency communi-cation, 5G network, 3GPP, 6G vision

Mobile P2P in Cellular Mobile Networks

2011 ◽  
pp. 348-373
Author(s):  
Kurt Tutschku ◽  
Andreas Berl ◽  
Tobias Hossfeld ◽  
Hermann de Meer
Keyword(s):  
Mobile Networks ◽  
Mobile Communications ◽  
Communication Systems ◽  
Content Distribution ◽  
Mobile P2p ◽  
Universal Mobile Telecommunications System ◽  
And Performance ◽  
Edge Based ◽  
P2p Applications ◽  
Cellular Mobile

The telecommunication industry has recently seen two areas with very high growth rates: cellular networks, for example, GSM (Global System for Mobile Communications) or UMTS (Universal Mobile Telecommunications System), and P2P (Peer-to-Peer) file-sharing applications. A combination of both might be highly attractive: a) for attracting new users; and b) for exploiting the potential of cellular broadband technologies. From a system’s perspective, architectures and performance figures of cellular mobile network applications and services that have edge-based intelligence (e.g,. P2P applications) are, to the best of the authors’ knowledge, less researched and many questions remain open. This chapter presents the design of MP2P (Mobile P2P) applications for cellular mobile networks by using the example of a MP2P content-distribution application. First, the incompatibilities between the P2P paradigm and properties of cellular mobile networks are identified. Then, a design methodology for MP2P applications for cellular mobile networks is proposed. The proposed method is based on a functional analysis of the two basic P2P functions, resource mediation and resource access control. The result is a hybrid P2P content-distribution architecture, which is enhanced by different operator-controlled infrastructure elements. The suggested architecture does not only overcome incompatibilities between P2P and cellular mobile communication systems, it also meets the functional needs and performance requirements of future P2P applications in cellular environments, while still largely preserves the user characteristics and efficiency of P2P systems. Finally, the performance enhancements by the architecture for the two basic P2P functions are investigated by comprehensive simulative and analytical performance evaluations.

scholarly journals Mechanical and Microstructural Characteristics of Calcium Sulfoaluminate Cement Exposed to Early-Age Carbonation Curing

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3515
Author(s):  
Weikang Wang ◽  
Xuanchun Wei ◽  
Xinhua Cai ◽  
Hongyang Deng ◽  
Bokang Li
Keyword(s):  
Cement Paste ◽  
Pore Diameter ◽  
Performance Enhancement ◽  
Diameter Distribution ◽  
Early Age ◽  
Calcium Sulfoaluminate ◽  
Starting Point ◽  
And Performance ◽  
Curing Pressure ◽  
Carbonation Curing

: The early-age carbonation curing technique is an effective way to improve the performance of cement-based materials and reduce their carbon footprint. This work investigates the early mechanical properties and microstructure of calcium sulfoaluminate (CSA) cement specimens under early-age carbonation curing, considering five factors: briquetting pressure, water–binder (w/b) ratio, starting point of carbonation curing, carbonation curing time, and carbonation curing pressure. The carbonization process and performance enhancement mechanism of CSA cement are analyzed by mercury intrusion porosimetry (MIP), thermogravimetry and derivative thermogravimetry (TG-DTG) analysis, X-ray diffraction (XRD), and scanning electron microscope (SEM). The results show that early-age carbonation curing can accelerate the hardening speed of CSA cement paste, reduce the cumulative porosity of the cement paste, refine the pore diameter distribution, and make the pore diameter distribution more uniform, thus greatly improving the early compressive strength of the paste. The most favorable w/b ratio for the carbonization reaction of CSA cement paste is between 0.15 and 0.2; the most suitable carbonation curing starting time point is 4 h after initial hydration; the carbonation curing pressure should be between 3 and 4 bar; and the most appropriate time for carbonation curing is between 6 and 12 h.

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