Mr. John Giusti

Chief of the International Bureau

Federal Communications Commission

445 12^th^ 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
two additional draft Executive Branch proposals for WRC-07. These
proposals consider the federal agency inputs toward the development of
U.S. Proposals for WRC-07.

The enclosed document contains two draft proposals that address Agenda
Item 1.2. These proposals are 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 18, 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 1.2:** to consider allocations and regulatory issues
related to the Earth exploration-satellite (passive) service, space
research (passive) service and the meteorological-satellite service in
accordance with Resolutions **746 (WRC--03)** and **742** **(WRC--03)**;

**Background Information:** This proposal addresses Resolution **742**
**(WRC‑03), "**consideration of sharing criteria between the passive
services and the fixed and mobile services in the band 36-37 GHz to
determine appropriate sharing criteria and to consider the possible
inclusion of such sharing criteria within the Radio Regulations."

The frequency band 36-37 GHz is allocated to the Earth
exploration-satellite (passive), the space research (passive), the fixed
and the mobile services on a primary basis. This band has been used for
passive sensing of the Earth and its atmosphere for many years. It is an
important resource for remote sensing of rain rates, snow, sea ice and
clouds and is often used in conjunction with a number of other passive
sensing bands to extract such data. A variety of scientific and
meteorological spacecraft carry instruments that utilize this band.
There is limited use of the band by the fixed or mobile services.
However, determination of appropriate sharing criteria should not place
undue constraints on the future use of the band by the fixed and mobile
services.

The ITU-R has undertaken studies that should result in Recommendations
in Study Group 9 and Study Group 7, which would recommend various
interference mitigation measures to be taken. These studies indicate
that passive sensing systems may receive excessive interference if there
are no limitations on the power of fixed and mobile service transmitters
as deployment densities of the terrestrial services in this band
increase. Based on the results of these studies, a new footnote in
Article **5** of the Radio Regulations should be added, containing
appropriate transmitter power limits on future systems operating in the
36-37 GHz band for the fixed and mobile services.

**Proposal:**

**USA/ /1 MOD**

34.2-40 GHz

+-----------------------+-----------------------+-----------------------+
| Allocation to         |                       |                       |
| services              |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Region 1              | Region 2              | Region 3              |
+-----------------------+-----------------------+-----------------------+
| **......**            |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **36-37** EARTH       |                       |                       |
| EXPLORATION-SATELLITE |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| FIXED                 |                       |                       |
|                       |                       |                       |
| MOBILE                |                       |                       |
|                       |                       |                       |
| SPACE RESEARCH        |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| 5.149 **ADD 5.AAA**   |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **......**            |                       |                       |
+-----------------------+-----------------------+-----------------------+

**USA/ /2 ADD**

**5.AAA** In the band 36-37 GHz, the power delivered to the antenna of a
station brought into use in the fixed or mobile services after
\[effective date of WRC-07 Final Acts\] shall not exceed --10 dBW.

**Reasons:** Passive sensor measurements in this band are currently
being used to determine rain, snow, ocean ice and water vapor properties
for use in numerical weather prediction models and other scientific
applications including studies the hydrological cycle or global water
circulation. Currently, this band is lightly used worldwide by the fixed
and mobile services. It is necessary to establish an appropriate
operational environment to protect the future use of Earth
exploration-satellite (passive) and space research (passive) services in
this band without imposing undue constraints on the fixed or mobile
services.

United States of America

DRAFT PROPOSALS FOR THE WORK OF THE CONFERENCE

**Agenda Item 1.2:** to consider allocations and regulatory issues
related to the Earth exploration-satellite (passive) service, space
research (passive) service and the meteorological-satellite service in
accordance with Resolutions **746** **(WRC 03)** and **742 (WRC 03)**;

**Background Information:** This proposal addresses ***resolves 2*** of
Resolutions **746** **(WRC‑03), "**consideration of the sharing
conditions between the EESS (passive) and the SRS (passive) on one hand
and the fixed and mobile services on the other hand in the band
10.6-10.68 GHz to determine appropriate sharing criteria" and
***resolves 3***, "...to consider the inclusion of such sharing criteria
within the Radio Regulations."

The frequency band 10.6-10.68 GHz is allocated to the Earth
exploration-satellite service (EESS) (passive), radio astronomy and
space research (passive) services on a primary basis. This band is also
allocated to the mobile (except aeronautical mobile) and the fixed
services on a primary basis, taking into account RR No. **5.482**, which
limits transmitter power and e.i.r.p. in these services in most
administrations. This band has been used for passive sensing of Earth
and its atmosphere for many years. It is an important resource for
remote sensing of rain, snow, sea state, ocean wind, and soil moisture
content and is often used in conjunction with a number of other passive
sensing bands to extract such data. A variety of scientific spacecraft
carry instruments that utilize this band. However, this band is also
extensively use by the fixed service.

Resolution **746** states in *considering h)* "that the EESS (passive)
operating in the band 10.6-10.68 GHz may experience harmful interference
from the emissions of systems of active services;" and in *recognizing
3)* "that the provisions given in No. **5.482** may not be sufficient to
ensure the protection of the EESS (passive) in the band 10.6-10.68 GHz."
On this basis, Resolution **746** called for studies of the sharing
conditions in this band. The ITU-R has undertaken studies that should
result in Recommendations on additional interference mitigation
measures. The studies supporting the Recommendations are to be
summarized in ITU-R Reports.

A contribution to ITU--R Working Party 7C from the World Meteorological
Organization (WMO) provided evidence of interference detected by one
EESS (passive) instrument operating in the 10.6-10.68 GHz band.

Based on the results of the ITU-R studies and the apparent
ineffectiveness of the current constraints given in No. **5.482** in
protecting the EESS (passive) operations in the 10.6-10.68 GHz band, a
modification to No. **5.482**, urging administrations to further limit
the fixed and mobile service emissions in this band is proposed.

**Proposal:**

USA/ /1 MOD

+----------------------+----------------------+-----------------------+
| 10-11.7 GHz          |                      |                       |
+----------------------+----------------------+-----------------------+
| Allocation to        |                      |                       |
| services             |                      |                       |
+----------------------+----------------------+-----------------------+
| Region 1             | Region 2             | Region 3              |
+----------------------+----------------------+-----------------------+
| **......**           |                      |                       |
+----------------------+----------------------+-----------------------+
| **10.6-10.68** EARTH |                      |                       |
| E                    |                      |                       |
| XPLORATION-SATELLITE |                      |                       |
| (passive)            |                      |                       |
|                      |                      |                       |
| FIXED                |                      |                       |
|                      |                      |                       |
| MOBILE except        |                      |                       |
| aeronautical mobile  |                      |                       |
|                      |                      |                       |
| RADIO ASTRONOMY      |                      |                       |
|                      |                      |                       |
| SPACE RESEARCH       |                      |                       |
| (passive)            |                      |                       |
|                      |                      |                       |
| Radiolocation        |                      |                       |
|                      |                      |                       |
| 5.149 **MOD** 5.482  |                      |                       |
+----------------------+----------------------+-----------------------+
| **.......**          |                      |                       |
+----------------------+----------------------+-----------------------+

**USA/ /2 MOD**

**5.482** In the band 10.6-10.68 GHz, stations of the fixed and mobile,
except aeronautical mobile, services shall be limited to a maximum
equivalent isotropically radiated power of 40 dBW and the power
delivered to the antenna shall not exceed --3 dBW. These limits may be
exceeded subject to agreement obtained under No. **9.21**. However, in
Saudi Arabia, Armenia, Azerbaijan, Bahrain, Bangladesh, Belarus, China,
the United Arab Emirates, Georgia, India, Indonesia, Iran (Islamic
Republic of), Iraq, Japan, Kazakhstan, Kuwait, Latvia, Lebanon, Moldova,
Nigeria, Pakistan, the Philippines, Qatar, the Syrian Arab Republic,
Tajikistan and Turkmenistan, the restrictions on the fixed and mobile,
except aeronautical mobile, services are not applicable. ~~(WRC-03)~~
[In order to protect the Earth exploration-satellite (passive) and space
research (passive) services, after \[effective date of WRC-07 Final
Acts\], administrations should limit the power delivered to the
transmitter antenna to a maximum of -10 dBW for new stations authorized
in the fixed service, and to a maximum of -17 dBW for new stations
authorized in the mobile service (except aeronautical mobile) operating
in the 10.6-10.68 GHz band.]{.underline}

## 

## Reasons: Passive sensor measurements in this band are currently being used for weather prediction and natural disaster prediction as well as for other scientific applications. Interference into operational passive sensors has been documented in the ITU-R, even with the current power and e.i.r.p. limits specified in RR No, 5.482. To limit the potential increase in interference and maintain the utility of this band for passive remote sensing, the transmit power levels of future stations in the fixed and mobile (except aeronautical mobile) services needs to be reduced to protect the Earth exploration-satellite (passive) and space research (passive) services.