Donald Abelson

Chief of the International Bureau

Federal Communications Commission

445 12th Street SW

Washington, D.C. 20554

Dear Mr. Abelson:

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

The enclosed document contains a draft proposal that addresses agenda
item 1.20. This is a counter proposal to one that was drafted by your
WRC Advisory Committee. The original proposal was contained in Public
Notice DA 05--1011. This counter 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 March 17, 2006 by Karl Nebbia for)*
>
> Fredrick R. Wentland
>
> Associate Administrator
>
> Office of Spectrum Management

Enclosure

**United States of America**

## DRAFT PROPOSAL FOR THE WORK OF THE CONFERENCE

**WRC-07 Agenda Item 1.20**[^1]**:** to consider the results of studies,
and proposals for regulatory measures, if appropriate, regarding the
protection of the Earth exploration-satellite service (passive) from
unwanted emissions of active services in accordance with Resolution
**738 (WRC--03)**;

**Background Information:** The *resolves* in Resolution **738** calls
for three actions: 1) study the compatibility between EESS (passive) and
the corresponding active services listed in the Table in Resolution
**738** to update Recommendation ITU-R SM.1633 or develop additional
Recommendations; 2) further study the impact of implementing the values
in *considering f* ) and *g*) in the bands 31--31.3 GHz and
51.4--52.6 GHz for unwanted emissions of systems operating in Region 2
and 3, taking into account that the impact on fixed-service systems in
Region 1 is documented in ITU-R Recommendation SM.1633; and 3) review
the results of studies in 1) and 2) in order to consider regulatory
measures, if appropriate, to ensure the protection of the EESS (passive)
operating in the bands listed in the table in Resolution **738** **(WRC
03)** from unwanted emissions of active services operating in the
corresponding bands while taking into account the impact on all
concerned services of implementing or not implementing such measures.
The table below shows the frequency band and radiocommunication service
combinations within the scope of the agenda item.

Studies documented in Recommendation ITU--R SM.1633 show that active
services in some of these bands do not produce significant unwanted
emissions in the adjacent passive band. However, active services in
other bands produce unwanted emissions in excess of EESS (passive)
protection requirements. Because of the differences between the active
services, and the differences in the use of the active and passive
services from band to band, the solutions for this agenda item have been
determined on a band-by-band and service-by-service basis. The proposed
solutions were determined considering the impact to both the active and
passive services.

Resolution **738** can be suppressed, and there is no need for an agenda
item dealing with unwanted emission levels in EESS (passive) bands for
the next Conference.

**Proposal:**

**USA/ /1 MOD**

**USA/ /2 ADD**

**5.AAA** In order to ensure the protection of the Earth
exploration-satellite (passive) service in the band 1 400--1 427 MHz,
the unwanted emissions power delivered to the antenna of any station in
the fixed service operating in the band 1 350--1 400 MHz or in the band
1 427--1 452 MHz shall be limited to --45 dBW in the 27 MHz reference
bandwidth of the band 1 400--1 427 MHz. Fixed service systems in
operation at the date of entry into force of the Final Acts of WRC-07
are not subject to this limit.

**Reasons:** Results of studies documented in Recommendation ITU--R
SM.1633 show that large numbers of higher power fixed service
transmitters can cause significant levels of unwanted emissions in the
1 400--1 427 MHz passive band. Considering equitable burden-sharing
between the active and passive services, the single-entry unwanted
emission limit proposed for future systems will slightly exceed the
desired protection level of the EESS (passive) sensors in some cases,
but will still allow the collection of valuable scientific data and will
not place an undue burden on the future development and use of the fixed
service in these nearby bands.

**USA/ /3 [NOC]{.underline}**

No change to Radio Regulations regarding the radiolocation service
allocation in the band 1 350--1 400 MHz.

**Reasons:** Although studies documented in Recommendation ITU--R
SM.1633 show that the radiolocation unwanted emissions in the EESS
(passive) band at 1 400--1 427 MHz would exceed the permissible
interference threshold in Recommendation ITU--R SA.1029--2, any
interference would occur for only short time periods and would be
readily discernible by users of the remote sensing data, allowing
corrupted data to be discarded. The remaining uncorrupted data is
expected to satisfy the scientific objectives of the EESS missions.
Studies also show that radars would experience unacceptable degradation
in operational coverage and range, target resolution, and accuracy if
required to meet unwanted emission limits in the 1 400--1 427 MHz band.
As with other pairs of active and passive bands, use of portions of the
allocated bands must not be restricted. Radars would suffer an increased
likelihood of interference from other radars and a reduction in coverage
range, while a reduced bandwidth would be inadequate for remote sensing
requirements.

**USA/ /4 ADD**

**5.BBB** In order to ensure the protection of the Earth
exploration-satellite (passive) service in the band 1 400--1 427 MHz,
the unwanted emissions e.i.r.p. of any earth station in the space
operation service (Earth-to-space) operating in the band 1 427--1 429
MHz shall be limited to 8 dBW in the 27 MHz reference bandwidth of the
band 1 400--1 427 MHz. Space operation service earth stations in
operation at the date of entry into force of the Final Acts of WRC-07
are not subject to this limit.

**Reasons:** Results of studies documented in Recommendation ITU--R
SM.1633 show that earth station transmitters in the 1 427--1 429 MHz
band can cause significant levels of unwanted emissions in the
1 400--1 427 MHz passive band. Considering equitable burden-sharing
between the active and passive services, the single-entry unwanted
emission limit proposed for future systems will slightly exceed the
desired protection level of the EESS (passive) sensors in some cases,
but will still allow the collection of valuable scientific data and will
not place an undue burden on the future development and use of the space
operation service (Earth-to-space) in the 1 427--1 429 MHz band.

+-----------------------+-----------------------+-----------------------+
| 22-24.75 GHz          |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Allocation to         |                       |                       |
| services              |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Region 1              | Region 2              | Region 3              |
+-----------------------+-----------------------+-----------------------+
| **....**              |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **22.55-23.55** FIXED |                       |                       |
|                       |                       |                       |
| INTER-SATELLITE       |                       |                       |
|                       |                       |                       |
| MOBILE                |                       |                       |
|                       |                       |                       |
| 5.149                 |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **23.55-23.6** FIXED  |                       |                       |
|                       |                       |                       |
| MOBILE                |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **23.6-24** EARTH     |                       |                       |
| EXPLORATION-SATELLITE |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| RADIO ASTRONOMY       |                       |                       |
|                       |                       |                       |
| SPACE RESEARCH        |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| 5.340                 |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **....**              |                       |                       |
+-----------------------+-----------------------+-----------------------+

**USA/ /5 [NOC]{.underline}**

No change to Radio Regulations regarding the inter-satellite service
allocation in the band 22.55--23.55 GHz.

**Reasons:** Results of studies documented in Recommendation ITU--R
SM.1633 show that unwanted emissions from the ISS in the 22.55--23.55
GHz band are well below the recommended protection criteria for the EESS
(passive) in the 23.6--24.0 GHz band. Therefore, no changes are needed
to the Radio Regulations to protect the EESS (passive) in the 23.6--24.0
GHz band from unwanted emissions from the ISS in the 22.55--23.55 GHz
band.

**USA/ /6 MOD**

+-----------------------+-----------------------+-----------------------+
| 29.9-34.2 GHz         |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Allocation to         |                       |                       |
| services              |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Region 1              | Region 2              | Region 3              |
+-----------------------+-----------------------+-----------------------+
| **....**              |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **30-31**             |                       |                       |
| FIXED-SATELLITE       |                       |                       |
| (Earth-to-space)      |                       |                       |
|                       |                       |                       |
| MOBILE-SATELLITE      |                       |                       |
| (Earth-to-space)      |                       |                       |
|                       |                       |                       |
| Standard frequency    |                       |                       |
| and time              |                       |                       |
| signal-satellite      |                       |                       |
| (space-to-Earth)      |                       |                       |
|                       |                       |                       |
| 5.542                 |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **31-31.3** FIXED     |                       |                       |
| 5.543A ADD 5.CCC      |                       |                       |
|                       |                       |                       |
| MOBILE                |                       |                       |
|                       |                       |                       |
| Standard frequency    |                       |                       |
| and time              |                       |                       |
| signal-satellite      |                       |                       |
| (space-to-Earth)      |                       |                       |
|                       |                       |                       |
| Space research 5.544  |                       |                       |
| 5.545                 |                       |                       |
|                       |                       |                       |
| 5.149                 |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **31.3-31.5** EARTH   |                       |                       |
| EXPLORATION-SATELLITE |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| RADIO ASTRONOMY       |                       |                       |
|                       |                       |                       |
| SPACE RESEARCH        |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| 5.340                 |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **....**              |                       |                       |
+-----------------------+-----------------------+-----------------------+

**USA/ /7 [NOC]{.underline}**

No change to Radio Regulations regarding the fixed-satellite service
(Earth-to-space) allocation in the band 30-31 GHz.

**Reasons:** Results of studies documented in Recommendation ITU--R
SM.1633 show that unwanted emissions from the FSS in the 30-31 GHz band
do not exceed the recommended protection criteria for the EESS (passive)
in the 31.3-31.5 GHz band. The FSS allocation is separated from the EESS
(passive) allocation by 300 MHz, which greatly reduces the possibility
of FSS unwanted emissions exceeding the protection criteria in the EESS
(passive) band. Unwanted emission limits in the EESS (passive) band are
unnecessary, and could constrain the future development of FSS uplink
transmitters in the 30-31 GHz band.

**USA/ /8** **ADD**

**5.CCC** In order to ensure the protection of the Earth
exploration-satellite (passive) service in the band 31.3--31.5 GHz, the
unwanted emissions power delivered to the antenna of any station in the
fixed service operating in the band 31.0--31.3 GHz shall be limited to
--38 dBW in any 100 MHz reference bandwidth in the band 31.3--31.5 GHz
(see also No. **5.543A**). Fixed service systems in operation at the
date of entry into force of the Final Acts of WRC--07 are not subject to
this limit.

**Reasons:** Studies documented in Recommendation ITU--R SM.1633
indicate that EESS (passive) systems in the 31.3--31.5 GHz band are
protected if unwanted emissions in that band from fixed service
transmitters in the 31.0--31.3 GHz band do not exceed --38 dBW in any
100 MHz reference bandwidth. Measures to ensure that future FS systems
in the 31.0--31.3 GHz band do not exceed this level will not constitute
an undue burden on the fixed service.

**USA/ /9 MOD**

+----------------------+----------------------+-----------------------+
| 40-47.5 GHz          |                      |                       |
+----------------------+----------------------+-----------------------+
| Allocation to        |                      |                       |
| services             |                      |                       |
+----------------------+----------------------+-----------------------+
| Region 1             | Region 2             | Region 3              |
+----------------------+----------------------+-----------------------+
| **....**             |                      |                       |
+----------------------+----------------------+-----------------------+
| **47.2-47.5** FIXED  |                      |                       |
|                      |                      |                       |
| FIXED-SATELLITE      |                      |                       |
| (Earth-to-space)     |                      |                       |
| 5.552 ADD 5.DDD      |                      |                       |
|                      |                      |                       |
| MOBILE               |                      |                       |
|                      |                      |                       |
| 5.552A               |                      |                       |
+----------------------+----------------------+-----------------------+

**USA/ /10 ADD**

**5.DDD** In order to ensure the protection of the Earth
exploration-satellite (passive) service in the band 50.2-50.4 GHz, the
unwanted emissions e.i.r.p. of any earth station in the fixed-satellite
service operating in the band 47.2-50.2 GHz in Regions 2 and 3,
49.44-50.2 GHz in Region 1, and 50.4-51.4 GHz in all Regions shall be
limited to 30 dBW in the 200 MHz reference bandwidth of the band
50.2-50.4 GHz. Fixed-satellite service systems in operation at the date
of entry into force of the Final Acts of WRC-07 are not subject to this
limit.

**Reasons:** Results of studies documented in Recommendation ITU--R
SM.1633 show that fixed-satellite service uplink transmitters operating
in bands adjacent to then 50.2-50.4 GHz passive band can cause
significant levels of unwanted emissions in the 50.2-50.4 GHz passive
band.

**USA/ /11 MOD**

+-----------------------+-----------------------+-----------------------+
| 51.4-55.78 GHz        |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Allocation to         |                       |                       |
| services              |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Region 1              | Region 2              | Region 3              |
+-----------------------+-----------------------+-----------------------+
| **51.4-52.6** FIXED   |                       |                       |
| ADD 5.EEE             |                       |                       |
|                       |                       |                       |
| MOBILE                |                       |                       |
|                       |                       |                       |
| 5.547 5.556           |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **52.6-54.25** EARTH  |                       |                       |
| EXPLORATION-SATELLITE |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| SPACE RESEARCH        |                       |                       |
| (passive)             |                       |                       |
|                       |                       |                       |
| 5.340 5.556           |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **....**              |                       |                       |
+-----------------------+-----------------------+-----------------------+

**USA/ /12 ADD**

**5.EEE** In order to ensure the protection of the Earth
exploration-satellite (passive) service in the band 52.6--54.25 GHz, the
unwanted emissions power delivered to the antenna of any station in the
fixed service operating in the band 51.4--52.6 GHz shall be limited to
--33 dBW in any 100 MHz reference bandwidth in the band 52.6--54.25 GHz.
Fixed-service systems in operation at the date of entry into force of
the Final Acts of WRC-07 are not subject to this limit.

**Reasons:** Studies documented in Recommendation ITU--R SM.1633
indicate that EESS (passive) systems in the 52.6--54.25 GHz band are
protected if unwanted emissions in that band from fixed service
transmitters in the 51.4--52.6 GHz band do not exceed --33 dBW in any
100 MHz reference bandwidth. Measures to ensure that future FS systems
in the 51.4--52.6 GHz band do not exceed this level will not constitute
an undue burden on the fixed service.

**USA/ /13 SUP**

RESOLUTION 738 (WRC‑03)

Compatibility analyses between the Earth exploration-satellite\
service (passive) and active services

**Reasons:** Consequential to completion of this agenda item. All of the
actions required under this Resolution will have been completed at
WRC-07 and it may be suppressed. The technical studies will either have
confirmed that the unwanted emissions do not interfere with the EESS
(passive) or appropriate regulatory measures, if necessary, will have
been determined and decided by WRC-07.

[^1]: This is a counter proposal to the one contained in FCC Public
    Notice DA 05--1011 as WAC/052(04.04.05).