ORGANIZACION DE LOS ESTADOS AMERICANOS
ORGANIZATION OF AMERICAN STATES
Comisión Interamericana de Telecomunicaciones
Inter-American TelecommunicationCommission
XXIII MEETING OF PERMANENT
CONSULTATIVE COMMITTEE II:
RADIOCOMMUNICATIONS
March 17 to 21, 2014
Cartagena de Indias, Colombia
OEA/Ser.L/XVII.4.2
CCP.II-RADIO/doc. 3524/14
10 March 2014
Original: English
AGENDA ITEM 1.1: PRELIMINARY PROPOSAL FOR
WRC-15
(4500-4800 MHz and 5 850 – 6 425 MHz)
(Item on the Agenda: 3.1 (SGT1))
(Document submitted by the delegation of Brazil)
Introduction
WRC-15 agenda item 1.1 asks for consideration of additional spectrum allocations to the mobile service
and identification of additional frequency bands for IMT. JTG 4-5-6-7, the responsible group for
conducting studies under agenda item 1.1, is considering a range of frequency bands, varying from 410
MHz to 6 GHz.
The Brazilian Administration has been conducting studies to satisfy agenda item 1.1 in various bands and
has been able to conclude its consideration for the bands5850–6425 MHz and 4500-4800 MHz.
Considering the extensive use of the C Band in Brazil, the Brazilian Administrations considers the need to
protect the Fixed Satellite Service in the frequency bands5850–6425 MHz and 4500-4800 MHz.
The Brazilian Administration would like to present a proposal of NOC in the Radio Regulations to the
frequency bands of 5850 -6425 MHz and 4500-4800 MHz in response to agenda item 1.1.
CITEL, 1889 F ST. NW., WASHINGTON, D.C. 20006, U.S.A.
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Agenda Item 1.1:
to consider additional spectrum allocations to the mobile service on a primary
basis and identification of additional frequency bands for International Mobile Telecommunications
(IMT) and related regulatory provisions, to facilitate the development of terrestrial mobile broadband
applications, in accordance with Resolution 233 (WRC-12);
BACKGROUND:
(P2!R-3283-1-1r2_i)
Mobile broadband systems, data and applications have become key drivers of global economic growth,
job creation and competitiveness. A recently released industry report indicates that global mobile data
traffic grew 133 percent in 2011 alone, with mobile video comprising 52% of the traffic.1This dramatic
increase in demand for mobile broadband applications has led to a need for additional radio spectrum to
support the increasing mobile data traffic. The World Radiocommunication Conference 2012 (WRC-12)
recognized this need and adopted WRC-15 Agenda Item 1.1, in an effort to address a looming spectrum
shortage for mobile broadband services.
WRC-12 (Resolution 233 (WRC-12)) invites the ITU-R to study additional spectrum requirements for
IMT, taking into account:

Technical and operational characteristics of IMT systems, including the evolution of IMT through
advances in technology and spectrally-efficient techniques, and their deployment;

the bands currently identified for IMT, the technical conditions of their use, and the possibility of
optimizing the use of these bands with a view to increasing spectrum efficiency;

the evolving needs, including user demand for IMT and other terrestrial mobile broadband
applications;

the needs of developing countries;

the time-frame in which spectrum would be needed;
In addition, the ITU-R is invited to study potential candidate bands, taking into account the results of the
study on additional spectrum requirements as well as protection of existing services and the need for
harmonization. The Resolution further resolves that the studies include sharing and compatibility studies
with services already having allocations in the potential candidate bands and in adjacent bands, as
appropriate, taking into account the current and planned use of these bands by the existing services, as
well as the applicable studies already performed in ITU-R.
According to CPM15-1 Decision on the Establishment and Terms of Reference of Joint Task Group 4-56-7, ITU-R Joint Task Group (JTG) 4-5-6-7 is the responsible group for this agenda item. The group is
tasked with developing sharing and compatibility studies as well as draft CPM text. This is to be done
taking into consideration the results of studies from ITU-R Working Party (WP) 5D on the spectrum
requirements for the mobile service, including suitable frequency ranges, as well as input from any
concerned Working Parties on technical and operational characteristics, spectrum requirements and
performance objectives or protection requirements of their services.
1
Cisco Visual Networking Index: Global Mobile Data Traffic Forecast Update, 2011-2016.
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Several Member States, Recognized Operating Agencies, Scientific or Industrial Organizations and
Regional and other International Organizations expressed their views on suitable frequency ranges to
satisfy this agenda item, submitting contributions to WP 5D and/or JTG 4-5-6-7. These frequency ranges
vary from around 400 MHz to 6 500 MHz, with one Member State proposing suitable frequency ranges
over 6 500 GHz. 2
ISSUES:
Below are some of the issues that will be addressed in consideration of Preliminary Views and Proposals
regarding Agenda Item 1.1.

How much spectrum is needed for future Mobile Broadband Application including IMT?

Consideration of the time frames for new/existing spectrum to support Mobile Broadband
Applications including IMT.

Need to take into account more spectrum-efficient techniques.

Need to take into account the results of study on additional spectrum requirements, protection of
and compatibility with existing services and the need for harmonization, when studying potential
candidate frequency bands.

Need to accommodate the requirements of developing countries and countries with large areas of
low population density.

Should potential additional spectrum for different applications be identified separately?
1. FREQUENCY RANGES BETWEEN 3-6 GHz
1.1. BAND 4500 - 4800 MHz
ISSUES:
The band 4 500-4 800 MHz, allocated to FSS (space-to-Earth), is part of the Appendix 30B FSS Plan,
which aims to preserve orbit/spectrum resources and guarantee, for all countries, equitable access to the
geostationary-satellite orbit at any-time and anywhere for their use.
The use of this band, for the same reasons explained in the 5850-6425 MHz band, such as favorable
propagation conditions, continental dimension and the challenges inherent to telecommunication
infrastructure in several parts of the country, is of special relevance in a country like Brazil.
Coexistence in this band between FSS (Space-to-Earth) and IMT, considering Report ITU-R M.2109 and
sharing studies that are being performed at the JTG, seems to be unfeasible due to the large separations
needed between receiving earth stations and IMT systems stations.
2
Contribution 5D/257 from Korea
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Considering the importance of the planned bands to provide equitable access to the geostationary orbit
and that new satellites that will be brought into use in a near future, the Brazilian Administration does not
support the inclusion of the 4 500 – 4 800 MHz frequency band as a potential candidate band for IMT.
PROPOSAL:
NOC
B/1.1/1
ARTICLE 5
Frequency allocations
Section IV – Table of Frequency Allocations
(See No. 2.1)
Allocation to services
Region 1
Region 2
Region 3
4 500 – 4 800
FIXED
FIXED-SATELLITE (space-to-Earth) S5.441
MOBILE
Reasons: Due to the existence of earth stations in the region and the importance of the C band for Brazil,
it turns out to be unfeasible the allocation of the 4 500-4 800 MHz band to IMT in the region.
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1.2. BAND 5850 – 6425MHz
ISSUES:
Due to the existence of an extensive network of earth stations in the region, particularly in Brazil, it turns
out to be unfeasible the allocation of the 5850 – 6425 MHz band to the mobile service in the region.
C band, including the Extended C band, is of special relevance in Brazil, as in other countries that, like
Brazil, have an extensive continental area. Southern Asia, for its similar meteorological conditions (great
rain precipitation) is another world region where C band is extensively used.
The use of C band is widespread in Brazil, due to its climate characteristics, associated with its
continental dimensions and the lack of telecommunications infrastructure in several parts of the country.
This is especially true in the Amazon region, where Internet access would not be possible without the use
of trunk links in C band, with connection to the World Wide Web network.
Transmitting earth stations operating in accordance with the Radio Regulations have the capability to
create interference to IMT systems, and sharing studies have been performed to assess the technical
feasibility of deploying IMT-Advanced systems in the 5 850–6 425 MHz band using the latest IMTAdvanced characteristics provided by WP 5D to the JTG. These sharing studies show separation distances
in the range of tens of kilometers that, considering the widespread deployment of FSS earth stations in
Brazil, coexistence would turn out to be unfeasible.
Additionally, FSS satellite systems must also be protected. Aggregate interference from IMT stations into
any satellite station, independently of the country deploying IMT systems, should also be considered to
ensure FSS protection in the long term.
In Brazil there are over 8,000 registered C band earth stations pointing to Brazilian satellites and over
12,000 registered stations pointing to foreign satellites that cover Brazil, in the frequency band
5925 – 6425 MHz. This number doubles once we include the Extended C band (5850-5925 MHz).
There are currently 10 Brazilian satellites and 27 foreign satellites duly authorized to operate in C band in
Brazil. Many of those authorizations have extended validity to over 2024.
This duly demonstrated extensive use of and high demand for C band reflect the important role of
national integration that this frequency band still plays in Brazil.
Considering the extensive used of C band in Brazil and the distances required between IMT stations and
FSS earth stations from sharing studies, sharing of both services seems unfeasible in uplink C band.
Therefore, the Brazilian Administration does not support the inclusion of the 5 850-6 425 MHz frequency
band as a potential candidate band for IMT.
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PROPOSAL:
NOC
B/1.1/2
ARTICLE 5
Frequency allocations
Section IV – Table of Frequency Allocations
(See No. 2.1)
Allocation to services
Region 1
5 850 – 5 925
FIXED
FIXED-SATELLITE
(Earth-to-space)
MOBILE
Region 2
5 850 – 5 925
FIXED
FIXED-SATELLITE
(Earth-to-space)
MOBILE
Amateur
Radiolocation
S5.150
S5.150
5 925 – 6 700
FIXED
FIXED-SATELLITE (Earth-to-space)
MOBILE
Region 3
5 850 – 5 925
FIXED
FIXED-SATELLITE
(Earth-to-space)
MOBILE
Radiolocation
S5.150
S5.149 S5.440 S5.458
Reasons: Due to the existence of an extensive network of earth stations in the region, particularly in
Brazil, it turns out to be unfeasible the allocation of the 5850-6425 MHz band to IMT in the region.
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