scholarly journals Method for Evaluation of Outage Probability on Random Access Channel in Mobile Communication Systems

2012 ◽  
Vol 63 (3) ◽  
pp. 191-195
Author(s):  
Martin Kollár
Keyword(s):  
Outage Probability ◽  
Mobile Communication ◽  
Mobile Communications ◽  
Communication Systems ◽  
Random Access ◽  
Base Station ◽  
Mobile Communication Systems ◽  
Request Message ◽  
Access Channel ◽  
Random Access Channel

Method for Evaluation of Outage Probability on Random Access Channel in Mobile Communication Systems In order to access the cell in all mobile communication technologies a so called random-access procedure is used. For example in GSM this is represented by sending the CHANNEL REQUEST message from Mobile Station (MS) to Base Transceiver Station (BTS) which is consequently forwarded as an CHANNEL REQUIRED message to the Base Station Controller (BSC). If the BTS decodes some noise on the Random Access Channel (RACH) as random access by mistake (so- called ‘phantom RACH') then it is a question of pure coincidence which èstablishment cause’ the BTS thinks to have recognized. A typical invalid channel access request or phantom RACH is characterized by an IMMEDIATE ASSIGNMENT procedure (assignment of an SDCCH or TCH) which is not followed by sending an ESTABLISH INDICATION from MS to BTS. In this paper a mathematical model for evaluation of the Power RACH Busy Threshold (RACHBT) in order to guaranty in advance determined outage probability on RACH is described and discussed as well. It focuses on Global System for Mobile Communications (GSM) however the obtained results can be generalized on remaining mobile technologies (ie WCDMA and LTE).

scholarly journals Development of mobile communication systems for high-speed railway

2021 ◽  
Vol 1 (1) ◽  
pp. 29-34
Author(s):  
Nedžad Branković ◽  
Aida Kalem ◽  
Adisa Medić
Keyword(s):  
Mobile Communication ◽  
Mobile Communications ◽  
Traffic Management ◽  
Communication Systems ◽  
High Speed ◽  
Data Communication ◽  
Mobile Communication Systems ◽  
Transport Services ◽  
Traffic Management System ◽  
Set Up

Development of high-speed railways set up challenges for new communication technologies. With the increase in speed, new requirements for communication systems have emerged that HSR requires greater reliability, capacity and shorter response time for efficient and safe operations. Mobile communication systems are crucial for the competitiveness of the railway industry and therefore have become one of the priorities addressed by the participants in the railway system to take advantage of technological opportunities to improve operational processes and the quality of provided transport services. The European Rail Traffic Management System (ERTMS) uses the Global System for Mobile Communications for Railways (GSM-R) for voice and data communication to communicate between trains and control centers. The International Railway Union is exploring new ways of communicating for high-speed railways because as speed increases this system becomes unreliable in information transmission. This paperwork presents an analysis of the evolution of communications on European railways since the usage of GSM-R. In addition, an overview of the various alternative solutions proposed during the time (LTE-R, Future Railway Mobile Communication System) as possible successors to GSM-R technology is given.

scholarly journals The usage of mobile communication systems in the trucking industry

2000 ◽  
Vol 12 (1) ◽  
pp. 49-56
Author(s):  
R Stephen Parker ◽  
John L Kent ◽  
Karl B Manrodt
Keyword(s):  
Mobile Communication ◽  
Mobile Communications ◽  
Communication System ◽  
Communication Systems ◽  
Cell Phones ◽  
Satellite Communications ◽  
Trucking Industry ◽  
Mobile Communication Systems ◽  
Mobile Communication System ◽  
Decision Factors

This article reports the findings of a mobile communications survey mailed out to over 2,000 trucking firms. The findings indicate that 68% of respondents use some form of mobile communication system in their firm. Various types of mobile communication systems were reported, including two-way pagers, one-way pagers, cell phones, two-way radio, and satellite communications. Additionally, implementation decision factors for mobile communication systems were evaluated for both users and non-users of mobile communication systems.

scholarly journals Performance analysis of S-Aloha used as a random acces channel on mobile communications

2005 ◽  
Vol 3 (01) ◽  
Author(s):  
D. Covarrubias ◽  
A. Mendez ◽  
C. Vargas
Keyword(s):  
Spatial Distribution ◽  
Mobile Communications ◽  
Rayleigh Fading ◽  
Operating Performance ◽  
Random Access ◽  
System Response ◽  
Capture Effect ◽  
Slotted Aloha ◽  
Access Channel ◽  
Random Access Channel

This paper evaluates the effects of Rayleigh fading, shadowing, and spatial distribution of the Mobile Terminals (MTs) on the operating performance of Slotted Aloha (S-Aloha) used as a Random Access Channel (RACH). This paper also evaluates the capture probability in a channel exhibiting Rayleigh fading, shadowing, and the effect of spatial distribution of the MTs. In addition, this work presents a different version of the steady-sate probabilities of the Markov chain of S-Aloha considering capture effect. This article simulates the stabilization of S-Aloha by utilizing an algorithm that dynamically controls the retransmission probabilities. Finally, this paper presents a numerical analysis of these simulations and identifies the operating of parameters that have shown to degrade system response.

scholarly journals System Coverage and Capacity Analysis on Millimeter-Wave Band for 5G Mobile Communication Systems with Massive Antenna Structure

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Jun Suk Kim ◽  
Jae Sheung Shin ◽  
Sung-Min Oh ◽  
Ae-Soon Park ◽  
Min Young Chung
Keyword(s):  
Millimeter Wave ◽  
Mobile Communication ◽  
Mobile Communications ◽  
Communication Systems ◽  
Wave Band ◽  
Mobile Communication Systems ◽  
Antenna Structure ◽  
Millimeter Wave Band ◽  
5G Mobile Communications ◽  
Central Network

The use of a millimeter-wave band defined as a 30–300 GHz range is significant element for improving performance of 5th generation (5G) mobile communication systems. However, since the millimeter-wave signal has peculiar propagation characteristics especially toward non-line-of-sight regions, the system architecture and antenna structure for 5G mobile communications should be designed to overcome these propagation limitations. For realization of the 5G mobile communications, electronics and telecommunications research institute (ETRI) is developing central network applying various massive antenna structures with beamforming. In this paper, we have introduced the central network and evaluated the system coverage and capacity through C++ language-based simulations with real geospatial information.

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