Mr. John Giusti

Acting 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 that addresses Agenda
Item 1.6 (**Res. 414**). This proposal considers additional allocations
for the aeronautical mobile (R) service (AM(R)S) in parts of the bands
between 108 MHz and 6 GHz, in accordance with Resolution **414**
(WRC‑03). During deliberations on this proposal, the Executive Branch
Agencies agreed that Radio Regulation **4.10** applies to both the
radionavigation-satellite service and the AM(R)S in the 5 000-5 010 and
5 010-5 030 MHz bands.

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,
>
> Fredrick R. Wentland
>
> Associate Administrator
>
> Office of Spectrum Management

Enclosure

# United States of America

## DRAFT PROPOSAL FOR THE WORK OF THE CONFERENCE[^1] {#draft-proposal-for-the-work-of-the-conference .unnumbered}

**Agenda Item 1.6 (Res. 414)**: to consider additional allocations for
the aeronautical mobile (R) service in parts of the bands between
108 MHz and 6 GHz, in accordance with Resolution **414 (WRC‑03)** and,
to study current satellite frequency allocations, that will support the
modernization of civil aviation telecommunication systems, taking into
account Resolution **415 (WRC‑03)**

**Background Information:** This proposal considers additional
allocations for the aeronautical mobile (R) service (AM(R)S) in parts of
the bands between 108 MHz and 6 GHz, in accordance with Resolution** 414
(WRC‑03)**.

AM(R)S bands are nearing saturation in high traffic areas and new
applications and concepts in air traffic management put further pressure
on existing AM(R)S bands. Resolution **414** **(WRC-03)** states that
new technologies to support air navigation may not conform to the
definition of aeronautical radionavigation in the Radio Regulations.
ITU-R Working Party 8B (WP 8B) and the International Civil Aviation
Organization (ICAO) developed a draft operational concept, and
technology selection criteria and procedures for new aviation
technology. WP 8B and ICAO determined that the new aviation systems
require two distinct categories of AM(R)S spectrum. The first category
covers surface applications that can support high data throughput over
transmission distances up to several kilometers. There is a high degree
of reuse by AM(R)S of this spectrum. This proposal addresses this
category of application. The second category for operation of AM(R)S
over long distances is addressed in other proposals under agenda item
1.6.

The 5 091 - 5 150 MHz is a suitable band for surface AM(R)S operations
close to airports. The bands 5 000-5 010 MHz and 5 010-5 030 MHz should
be allocated to AM(R)S on the basis that AM(R)S stations operating in
these bands cannot cause harmful interference to, nor claim protection
from radionavigation satellite service (RNSS) systems. Further, AM(R)S
operating in this band will be used only for surface applications at
airports. The AM(R)S systems are planned to have characteristics based
on IEEE 802.16e standards.

Analysis shows that compatibility between AM(R)S transmitters and RNSS
feeder uplink satellite receivers in the 5 000-5 010 MHz band is
practicable under worst case conditions. The analysis has also shown
that compatibility with RNSS feeder downlinks in the 5 010-5 030 MHz
band can be achieved with geographic separation between operating AM(R)S
transmitters and RNSS receivers. Since it may not be practical to
implement sufficient geographic separation between AM(R)S transmitters
and RNSS service link receivers in the vicinity of AM(R)S-equipped
airports there may be a possibility of some incompatibility between the
two operations. In these cases, spectrum management measures such as
site-specific analysis, consistent with the allocation to AM(R)S in the
5 010-5 030 MHz band, will need to be taken by the responsible
administration.

Geographic separation will ensure AM(R)S systems are compatible with
radio astronomy stations operating in the adjacent 4 990-5 000 MHz band.
In the few instances where radio astronomy observatories are in relative
proximity to airports, local coordination can be employed to resolve any
remaining issues.

**Proposal:**

USA/ / 1 MOD

4 800-5 570 MHz

+----------------------+----------------------+-----------------------+
| Allocation to        |                      |                       |
| services             |                      |                       |
+----------------------+----------------------+-----------------------+
| Region 1             | Region 2             | Region 3              |
+----------------------+----------------------+-----------------------+
| **5 000-5 010**      |                      |                       |
| AERONAUTICAL         |                      |                       |
| RADIONAVIGATION      |                      |                       |
|                      |                      |                       |
| RADIO                |                      |                       |
| NAVIGATION-SATELLITE |                      |                       |
| (Earth-to-space)     |                      |                       |
|                      |                      |                       |
| 5.367 **ADD 5.AMR**  |                      |                       |
+----------------------+----------------------+-----------------------+
| **5 010-5 030**      |                      |                       |
| AERONAUTICAL         |                      |                       |
| RADIONAVIGATION      |                      |                       |
|                      |                      |                       |
| RADIO                |                      |                       |
| NAVIGATION-SATELLITE |                      |                       |
| (space-to-Earth)     |                      |                       |
| (space-to-space)\    |                      |                       |
| 5.328B 5.443B 5.367  |                      |                       |
| **ADD 5.AMR**        |                      |                       |
+----------------------+----------------------+-----------------------+

**[Reasons: To provide allocations to support evolving AM(R)S
applications.]{.underline}**

USA/ /2 ADD

**5.AMR** The bands 5 000-5 010 MHz and 5 010- 5 030 MHz are also
allocated to the aeronautical mobile (R) service on a primary basis.
Resolution **\[AM(R)S-RNSS\](WRC-07)** shall apply.

**Reasons:** To provide allocations to support evolving AM(R)S surface
applications at airports.

**USA/ /3 ADD**

RESOLUTION \[AM(R)S-RNSS\] (WRC‑07)

Use of the 5 000-5 030 MHz band by the aeronautical mobile (R) service
and protection the radionavigation-satellite and the radioastronomy
services

The World Radiocommunication Conference (Geneva, 2007),

considering

*a)* the current allocation of the frequency band 5 000-5 010 MHz to the
aeronautical mobile satellite (R) service (AMS(R)S) subject to agreement
obtained under No. **9.21**, the aeronautical radionavigation service
(ARNS) and the radionavigation-satellite service (RNSS)
(Earth-to-space);

*b)* the current allocation of the frequency band 5 010-5 030 MHz to the
AMS(R)S subject to agreement obtained under No. **9.21**, the ARNS and
the RNSS (space-to-Earth and space-to-space);

*c)* that the WRC-07 has made allocations to the aeronautical mobile (R)
service (AM(R)S) in the bands 5 000-5 010 MHz and 5 010-5 030 MHz
limited to systems operating in accordance with recognized international
aeronautical standards;

*d)* that the International Civil Aviation Organization (ICAO) is in the
process of identifying the technical and operating characteristics of
new systems operating in the AM(R)S in the bands 5 000-5 010 MHz and 5
010-5 030 MHz;

*e)* that compatibility between AM(R)S systems and aeronautical
radionavigation systems operating in accordance with international
aeronautical standards will be ensured by ICAO,

recognizing

*a)* that ICAO publishes recognized international aeronautical standards
for AM(R)S;

*b)* that preliminary studies have been conducted within the ITU-R
concerning the sharing and compatibility of surface-based AM(R)S systems
with planned RNSS systems in the 5 000-5 010 MHz and 5 010-5 030 MHz
bands, and compatibility with the radio astronomy service operating in
the band 4 990-5 000 MHz;

*c)* that system characteristics for RNSS and AM(R)S systems planned for
the 5 000-5 010 MHz and 5 010-5 030 MHz bands are still evolving;

*d)* that technical characteristics and operational parameters for the
RNSS and AM(R)S have not been fully established by ITU-R and ICAO
respectively;

*e)* that the RNSS needs access to the bands 5 000-5 010 MHz and 5 010-5
030 MHz in the longer term;

*f)* that spectrum efficiency is enhanced in situations where new
applications can be implemented compatibly in heavily occupied bands,

> noting

*a)* that currently only preliminary guidelines are available for the
AM(R)S to ensure protection of the RNSS;

*b)* that the ITU-R is actively developing new Recommendations regarding
the technical characteristics and operational parameters for the RNSS,

resolves

1 that the operation of stations in the AM(R)S in the 5 000-5 010 MHz
and 5 010-5 030 MHz bands shall not cause harmful interference to, nor
claim protection from, RNSS systems;

2 that in the frequency bands 5 000-5 010 MHz and 5 010-5 030 MHz any
AM(R)S systems shall operate in accordance with Standards and
Recommended Practices (SARPs) requirements published in Annex 10 of the
ICAO Convention on International Civil Aviation;

3 that AM(R)S use in the 5 000-5 010 MHz and 5 010-5 030 MHz bands shall
be limited to stations operating on the surface of the Earth at
airports,

requests ITU‑R

1 to study, in the bands 5 000-5 010 MHz and 5 010-5 030 MHz, the
technical and operational issues relating to the protection of the RNSS
by the AM(R)S;

2 to study the technical and operational issues relating to the
compatibility between the radio astronomy service operating in the 4
990-5 000 MHz band and the AM(R)S operating in the bands 5 000-5 010 MHz
and 5 010-5 030 MHz;

3 to incorporate in ITU-R Recommendations and/or Reports the results
from the studies in *requests* ITU-R 1 and 2,

invites

1 administrations and ICAO to supply technical and operational
characteristics for the AM(R)S necessary for compatibility studies, and
to participate actively in the studies;

2 administrations to supply technical and operational characteristics
and protection criteria for the RNSS necessary for compatibility
studies, and to participate actively in the studies,

instructs the Secretary-General

to bring this Resolution to the attention of ICAO.

[^1]: This proposal is in addition to the earlier U.S. Proposals for
    agenda item 1.6.