Lauro joined Award Solutions in 2008, bringing over ten years of experience in the wireless telecommunication industry working with mobile cellular, broadband and satellite communications. Has a thorough knowledge and understanding of all standardized radio transmission technologies (i.e.: GSM, GPRS, EDGE, WCDMA, HSxPA, HSPA+,IS-95, cdma 1xRTT, 1xEV-DO) and non-standardized technologies (i.e.: Flash OFDM, I-Burst, etc.) as well as and their migration path to 4G and beyond (LTE and WiMAX).
Lauro has co-authored four different telecommunication books, has published 18 international refereed journal papers and over 30 international conference papers, all of them results of research in the wireless telecommunication area. Additionally, has presented over 20 different wireless related courses nationally and internationally to a diverse class of clients. Lauro has a thorough knowledge of mathematical analysis and hands-on experience on wireless and traffic engineering design, including Design, Planning, Performance & Optimization as well as computer simulation of mobile wireless networks. Through research and computer simulation techniques has helped a large base of clients (carriers, vendors, new start up companies) develop optimum technological solutions.
Currently, Lauro is one of the instructors at Award Solutions. His current focus is UMTS, HSPA/HSPA+ and LTE. He is also involved in the development of cutting edge training on optimization courses for LTE operators in the USA.
Lauro holds a Ph.D. in electrical engineering (EE) from King's College London, UK (the University of London), a MSc. In EE. and a B.EE from the National Polytechnic Institute, Mexico, all of them with specialty in telecommunications.
The cell radius in LTE is affected and/or determined by
a) The Preamble Format
b) The Cyclic Shift the corresponds to the
ZeroCorrelationZoneConfig parameter and,
c) The Cell Radius Parameter
A) Preamble Format
LTE FDD supports four preamble formats (as
of today, not all of them currently supported by the equipment manufacturers). The preamble consists of a cyclic prefix (to
handle multipath interference) followed by an 800 μs sequence. In preamble formats 2 and 3,
the sequence is repeated. The total length of the cyclic prefix and the
sequence(s) determines how long it takes to transmit the preamble. Since the
actual physical transmission occurs in units of sub-frames (1 ms), the
remaining time determines how far away the UE can be without overlapping
another UE's access attempt (the guard time). For further details, refer 3GPP
TS 36.211 - Physical Channels and Modulation.
The operator typically must pick a preamble
format to determine the coverage area desired. In the event of remote sites
deployment, the length of the fiber to the remote cells must be considered as
part of the cell radius (this includes Distributed Antenna Systems -DAS- ).
Since the speed of electromagnetic waves over fiber is only two thirds of the
speeds in free space, the total cell radius reduces to the values shown in the
Very informative , Thanks a lot.
Eagerly waiting for Part-2 and Part-3.
Very informative.what about TD-LTE?
Could you elaborate a little more on the above calculations for remote sites and how you arrived at the reduced cell radius.
There would appear to be a piece of information missing to understand the figures in the table. Would the reduced cell radius not be a function of fiber length and radio distance? Am i missing something?