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One day in advance of the next meeting of CITEL PCC
II, Sept. 15, 2008, a Seminar
on
“Activities related to the Fixed Satellite Service in the countries
of the Americas” will be held at the same venue The Hermitage
Hotel, Mar del Plata. Argentina. The Seminar will have presentations
from approximately 20 officials from CITEL member administrations, and
satellite operators serving the CITEL countries.
Please click
here to see the program.
There are many developments taking place involving
satellite communications in Citel member countries, and this Seminar
will afford the opportunity to learn about them. It is expected that
there will be an abundant amount of time for question and answer.
The presentations will fall into several categories.
These include A) Services provided by FSS satellites serving the
Region, B) Results of WRC-07 which impact fixed satellite services, C)
Interferences Issues which impact Fixed Satellite Services, and D) The
regulations concerned with the licensing of the FSS services.
The topics to be discussed will include 1)
modification of the Fixed Satellite Service Allotment Plan by WRC-07,
2) Regulations for Earth Stations on Board Vessels, 3) the
characteristics of systems for the FSS use on moving vehicles, and 4)
the sources of interference from terrestrial services to FSS systems.
These are some of the topics which will be
addressed in depth. For example, at WRC-07 regulations were adopted
which are intended to provide protection for the FSS in the band
3.4-4.2 GHz which is shared with the Fixed Service, and in some
countries with the Mobile Service. In some parts of the band Broadband
Wireless Access (BWA) is being introduced without taking into account
the interference which can unintentionally be caused by such systems.
The ITU-R Working Party 4A which is concerned with
efficient use of the geostationary orbit by the Fixed Satellite
Service is developing a Report which addresses the interference
problems that can be caused by BWA systems to the FSS. In addition the
Report is identifying the Mitigation techniques which can be used.
From the standpoint of the FSS is important because the use of this
part of the spectrum by the FSS is in a dynamic state of development,
and its shared use by the FS needs to be managed in a way so that
unexpected sources of interference do not occur.
There are several possible sources of interference
can cause to the FSS. The most important source is co-channel, in band.
Depending on the characteristics of the BWA system the separation
distance of the system to protect an FSS receive station could be
anywhere from 100-400 km. The Seminar will provide the opportunity to
explore the factors which determine the actual distances. In addition,
there will be discussions about the methodologies being developed to
assist Administrations in dealing with the sharing situation.
Another source of interference has been from Out of
Band emissions. In other words BWA transmissions operating in the band
3.4-3.7 GHz may cause interference into the FSS spectrum in the band
3.7-4.2 GHz. Typically, this may occur as a result of the BWA
transmissions not being licensed. It is expected that the Seminar
will have presentations on examples of how this has occurred, and
discussions about the best regulatory approaches.
Don Jansky
Coordinator of the Seminar
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