scholarly journals Radio Access Technologies for Broadband Mobile Communications

2017 ◽  
Vol E100.B (9) ◽  
pp. 1674-1687
Author(s):  
Mamoru SAWAHASHI ◽  
Kenichi HIGUCHI
Keyword(s):  
Mobile Communications ◽  
Radio Access

scholarly journals Problems of constructing broadband radio access systems of mobile radio communication

2019 ◽  
Vol 2019 (2) ◽  
pp. 24-30
Author(s):  
Василий Типаков ◽  
Vasily Sergeevich Tipakov ◽  
Тимур Яковлев ◽  
Timur Aleksandrovich Yakovlev
Keyword(s):  
Cellular Networks ◽  
Mobile Networks ◽  
Mobile Communications ◽  
Current Trend ◽  
Mobile Radio ◽  
Base Stations ◽  
Radio Communication ◽  
Radio Access ◽  
Broadband Radio ◽  
Internal Network

The article is focused on the problem of degrading the signals of broadband 3G / 4G mobile radio access systems in places of subscribers clustering and in so-called “dead zones”. The analysis of the actual principles of building mobile networks has been carried out, the main disadvantages of the approaches to the development of cellular networks have been identified. The current trend of building macro cells in the urban environment has lost its effectiveness due to the increasing frequencies used; it has to be replaced by a fundamentally new way of planning mobile networks. A new principle of providing access to mobile communications “from inside to outside” is proposed, which takes into account the needs of a large number of subscribers in the premises. It is based on setting the maximum number of internal base stations fully meeting the needs of internal network users. Such a distinction will positively affect all subscribers and improve the experience from using the high-quality services of the mobile operators, which will result in increasing the economic performance

scholarly journals Network Efficiency Amendment Utilizing Cloud Radio Access Network In Mobile Communications

2018 ◽  
Vol 7 (4.6) ◽  
pp. 350
Author(s):  
Karthikala. P ◽  
Dr. C.Arunachala Perumal ◽  
Ms. M.Ramya
Keyword(s):  
Mobile Communications ◽  
Optimization Design ◽  
Access Network ◽  
Telecommunications Industry ◽  
Data Traffic ◽  
Network Efficiency ◽  
Green Communication ◽  
Radio Access Network ◽  
Cloud Radio Access Network ◽  
Radio Access

Mobile data traffic is finding exponential growth currently in telecommunications industry. It has become important to concentrate on both spectral and energy efficiencies in utilizing cellular networks under green communication standpoint. Thus, for 5G the utmost priority is that to increase data traffic and reduce the total network energy ingesting by half. The proposed work is to design the Cloud Radio Access Network (C-RAN) with energy efficient, flexible and capacity-enhanced features by effectively bundling and establishing relation between BBU and RRU utilizing Catechistic technique. Mathematical results with realistic parameters prove that the projected optimization design clearly improve the energy efficiency of C-RAN’s compared to standard schemes. 

Security in 2.5G Mobile Systems

2009 ◽  
pp. 2752-2765
Author(s):  
Christos Xenakis
Keyword(s):  
Mobile Communications ◽  
Data Transfer ◽  
Access Network ◽  
Mobile Systems ◽  
Security Architecture ◽  
Security Measures ◽  
Packet Radio ◽  
Related Data ◽  
Radio Access ◽  
Fixed Part

The global system for mobile communications (GSM) is the most popular standard that implements second generation (2G) cellular systems. 2G systems combined with general packet radio services (GPRS) are often described as 2.5G, that is, a technology between the 2G and third generation (3G) of mobile systems. GPRS is a service that provides packet radio access for GSM users. This chapter presents the security architecture employed in 2.5G mobile systems focusing on GPRS. More specifically, the security measures applied to protect the mobile users, the radio access network, the fixed part of the network, and the related data of GPRS are presented and analyzed in detail. This analysis reveals the security weaknesses of the applied measures that may lead to the realization of security attacks by adversaries. These attacks threaten network operation and data transfer through it, compromising end users and network security. To defeat the identified risks, current research activities on the GPRS security propose a set of security improvements to the existing GPRS security architecture.

Security in 2.5G Mobile Systems

2008 ◽  
pp. 351-363
Author(s):  
Christos Xenakis
Keyword(s):  
Mobile Communications ◽  
Data Transfer ◽  
Access Network ◽  
Mobile Systems ◽  
Security Architecture ◽  
Security Measures ◽  
Packet Radio ◽  
Related Data ◽  
Radio Access ◽  
Fixed Part

The global system for mobile communications (GSM) is the most popular standard that implements second generation (2G) cellular systems. 2G systems combined with general packet radio services (GPRS) are often described as 2.5G, that is, a technology between the 2G and third generation (3G) of mobile systems. GPRS is a service that provides packet radio access for GSM users. This chapter presents the security architecture employed in 2.5G mobile systems focusing on GPRS. More specifically, the security measures applied to protect the mobile users, the radio access network, the fixed part of the network, and the related data of GPRS are presented and analyzed in detail. This analysis reveals the security weaknesses of the applied measures that may lead to the realization of security attacks by adversaries. These attacks threaten network operation and data transfer through it, compromising end users and network security. To defeat the identified risks, current research activities on the GPRS security propose a set of security improvements to the existing GPRS security architecture.

scholarly journals Field Trial on 5G New Radio Over Satellite

2021 ◽  
Vol 2 ◽  
Author(s):  
Florian Völk ◽  
Robert T. Schwarz ◽  
Andreas Knopp
Keyword(s):  
Mobile Communications ◽  
Field Trial ◽  
Core Network ◽  
Next Generation ◽  
Seamless Integration ◽  
Edge Node ◽  
The Core ◽  
Header Compression ◽  
Radio Access ◽  
New Radio

5G New Radio (NR) is the 3rd Generation Partnership Project (3GPP) radio access technology for the next generation mobile communications network. A major evolution of 5G constitutes the integration of non-terrestrial networks including geostationary and low Earth orbit satellites. The seamless integration of satellites in the terrestrial mobile network requires significant adaptations within the radio access network and the development of new features in the core network to cope with the specific satellite channel characteristics. To date, the 5G control and data plane has been standardized to handle only continuous backhaul communication between the network components. However, a mobile satellite enabled next generation Node B (gNB) located in a vehicle or in a moving aerial platform needs to be able to handle frequent backhaul outages of various duration as well as longer signal delays as opposed to short terrestrial connections via fiber. In this paper, we report the results of an over-the-air (OTA) field trial comprising a mobile edge node connected to the 5G standalone core network components over a geostationary satellite. We analyze Transmission Control Protocol (TCP) acceleration and GPRS Tunneling Protocol (GTP)/TCP/Internet Protocol (IP) header compression features through the GTP. Moreover, the influence of short and long interruptions in the communication between the edge node and the central components on the entire system performance is investigated. The header compression and TCP acceleration modules were implemented on the satellite modems and are now part of the protocol stack of these devices. The results show up to 12% higher data rates for the 5G user equipment (UE), on a 1.5 MHz single carrier return link compared to deactivated TCP acceleration and header compression. We increased the data rate by 20% on the 4.5 MHz DVB-S2X forward link between the UE and 5G core. Moreover, our measurements reveal that even satellite-enabled gNB mobility is possible with the current Release 15 standard. After a short outage of the satellite connection due to shadowing, the UE can successfully re-establish the user plane connection to the core network. Our results will facilitate the full integration of satellite components in 5G through open and standard solutions.

scholarly journals Comparison of 3GPP LTE and 3GPP2 UMB

2011 ◽  
pp. 68-73
Author(s):  
Swati Juneja ◽  
Abhinav Juneja ◽  
Mohit Juneja
Keyword(s):  
Mobile Communications ◽  
New Technology ◽  
Virtual Private Network ◽  
Cellular Systems ◽  
Multiple Antenna ◽  
File Transfer ◽  
3Gpp Lte ◽  
Radio Access ◽  
Air Interface ◽  
Private Network

In the last years, technology evolution in mobile communications is mainly motivated by three relevant agents: (1) the market globalization and liberalization and the increasing competence among vendors and operators coming from this new framework, (2) the popularization of IEEE 802 wireless technologies within the mobile communications sector and, finally, (3) the exponential increase in the demand for advanced telecommunication services. Concerning the last item, the envisaged applications to be supported by current and future cellular systems include Voice over IP (VoIP), videoconference, push-to-talk over cellular (PoC), multimedia messaging, multiplayer games, audio and video streaming, content download of ring tones, video clips, Virtual Private Network (VPN) connections, web browsing, email access, File Transfer Protocol (FTP). Thus, the race towards IMT-Advanced was officially started in March 2008, when a Circular Letter was distributed asking for the submission of new technology proposals. Previous to this official call, the 3rd Partnership Project (3GPP) established the Long Term Evolution (LTE) and the 3rd Partnership Project 2 (3GPP2) established the Ultra Mobile Broadband. In this paper we have conducted a comparative study between UMB and 3GPP LTE by focusing on their first layers, i.e. Physical layer. The comparison specifically includes system architecture, radio aspects of the air interface such as radio access modes, multiple access technologies, multiple antenna technologies, modulation and mobility.

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