Mr. John Giusti

Chief of the International Bureau

Federal Communications Commission

445 12th Street SW

Washington, D.C. 20554

Dear Mr. Giusti:

The National Telecommunications and Information Administration (NTIA),
on behalf of the Executive Branch agencies, has approved the release of
an additional draft Executive Branch proposal for WRC-07. This proposal
considers the federal agency inputs toward the development of U.S.
Proposals for WRC-07.

The enclosed document contains a draft proposal, which addresses Agenda
Item 7.2 and proposes to add an additional Agenda Item (2.XD) to the
WRC-10 agenda. This proposal is forwarded for your consideration and
review by your WRC-07 Advisory Committee. Jim Vorhies of my staff is the
primary contact for NTIA.

Sincerely,

> *(Original Signed September 20, 2006)*

Fredrick R. Wentland

> Associate Administrator
>
> Office of Spectrum Management

Enclosure

**United States of America**

**DRAFT PROPOSAL FOR THE WORK OF THE CONFERENCE**

**Agenda Item 7.2** to recommend to the Council items for inclusion in
the agenda for the next WRC, and to give its views on the preliminary
agenda for the subsequent conference and on possible agenda items for
future conferences, taking into account Resolution **802 (WRC‑03)**;

**Background Information:** The 37-38 GHz band is allocated to the
fixed, space research (space-to-Earth) and the mobile services on a
primary basis, and the 37.5-38 GHz portion of this band is also
allocated to the fixed satellite service (space-to-Earth) on a primary
basis. In addition, No. **5.547** **(MOD WRC-2000)** identifies the
37-40 GHz band as being available for high-density applications in the
fixed service (HDFS).

Space research earth station receivers are being implemented in the
37-38 GHz band to support manned missions, for both near Earth and deep
space distances, and use of the wider bandwidth available in the 37-38
GHz band will be required to support the increasing data requirements of
planned manned missions.

Aeronautical mobile stations are capable of causing unacceptable levels
of interference whenever they are within line-of-sight of a receiver in
the space research and Earth exploration satellite services. Preliminary
calculations within WP 7B have shown that aeronautical mobile
transmissions could cause unacceptable levels of interference for
significant periods of time. In particular, space research service Earth
station receivers operating in the 37-38 GHz band have very low
thresholds for which the ITU-R has already established both deep space
and non-deep space protection criteria Recommendations. Exceeding the
protection criteria of the space research service for an extended period
of time could jeopardize the success of a manned or scientific space
mission.

Presently, the Table of Frequency Allocations has already excluded
aeronautical mobiles in several frequency bands in which the mobile
service is co-allocated on a primary basis with the space research
service downlinks. These include 2.29-2.3 GHz (space research deep
space), 8.4-8.5 GHz (space research deep space and non-deep space),
22.21-22.5 GHz and 31.5-31.8 GHz (Earth exploration-satellite and space
research passive). Based on current information, to date there are no
aeronautical mobile systems operating in the 37-38 GHz band, nor are any
planned. Considering the planned developments of manned space research
service missions in the 37-38 GHz band, now might be the appropriate
time to consider the exclusion of aeronautical mobile stations from this
band as well.

**Proposal:**

USA/ / 1 MOD

RESOLUTION 803 (WRC-~~03~~[07]{.underline})

~~Preliminary~~ [A]{.underline}~~a~~genda for the 2010 World
Radiocommunication Conference

The World Radiocommunication Conference (Geneva,
200~~3~~[7]{.underline}),

USA/ / 2 add

**2.XD** to consider modifying the primary mobile service allocation in
the 37-38 GHz band to exclude aeronautical mobile stations, or to take
such other regulatory action as needed to protect the other primary
services in the band from interference from the aeronautical mobile
service, taking into account the results of ITU-R studies and Resolution
USA02.

**Reasons**: Planned manned space research missions require access to
the wider bandwidth available in this band. Aeronautical mobile stations
are capable of causing unacceptable interference when they are within
line-of-sight of a receiver operating in the space research service and
such interference levels may exist for extended periods, so jeopardizing
manned or scientific mission success. Excluding aeronautical mobile
systems in the 37-38 GHz band may be necessary to protect the other
primary services in the band from harmful interference.

USA/ /3 ADD

RESOLUTION USA02 (WRC-07)

Protection of Primary Services in the Band 37-38 GHz

The World Radiocommunication Conference (Geneva, 2007),

considering

a\) that the band 37-38 GHz is allocated on a primary basis to the
fixed, mobile, and, space research (space-to-Earth) services, and the
37.5-38 GHz portion of this band is also allocated on a primary basis to
the fixed-satellite service (space-to-Earth);

b\) that space research earth station receivers are being implemented in
the 37-38 GHz band to support both manned and unmanned missions, for
both near Earth and deep space distances, and use of the wider bandwidth
available in the 37-38 GHz band is required to support the increased
data requirements of planned manned and scientific missions;

c\) that an aeronautical mobile station can cause unacceptable
interference to receivers in the space research service whenever it is
within line-of-sight of the receiver, as indicated in Recommendation
ITU-R SA.1016;

d\) that interference from the emissions of an aeronautical mobile
station to a space research service earth station receiver may
significantly exceed the permissible interference levels for extended
periods of time, thus jeopardizing the success of a space mission;

recognizing

1\) that the Table of Frequency Allocations already excludes the
operation of aeronautical mobile stations in 2.29-2.3 GHz, 8.4-8.5 GHz,
22.21-22.5 GHz and 31.5-31.8 GHz where the mobile service is
co-allocated on a primary basis with the space research service
(space-to-Earth);

2\) that RR. No. **5.547** indicates that the 37-38 GHz band is
available for high density applications in the fixed service;

and noting

that aeronautical mobile service systems are currently not deployed nor
planned in the 37-38 GHz band;

*resolves*

1 to invite ITU-R to conduct appropriate studies involving the
aeronautical mobile service, the space research service, and the other
affected services in the band 37-38 GHz to determine the compatibility
of the aeronautical mobile service with these other services;

2 to recommend that WRC-10 review the results of the studies under
*resolves* 1 and consider the inclusion of any appropriate compatibility
criteria within the Radio Regulations or appropriate modifications to
the Table of Frequency Allocations, based on proposals from
administrations;

*invites administrations*

to contribute to the compatibility studies between the aeronautical
mobile service and the other services in the 37-38 GHz band;

*invites ITU-R*

to complete the necessary studies, as a matter of urgency, taking into
account the present use of the 37-38 GHz band, with a view to
presenting, at the appropriate time, the technical information likely to
be required as a basis for the work of the Conference.

**Reasons:** This resolution provides guidance on the ITU-R studies
required in support of the proposed WRC-10 Agenda Item.