DA 06-2262

November 1, 2006

**FCC SEEKS additional COMMENT ON RECOMMENDATIONS APPROVED BY THE
ADVISORY COMMITTEE FOR THE 2007 WORLD RADIOCOMMUNICATION CONFERENCE
regarding the regulatory measures for the protection of the Earth
exploration-satellite service (passive) from unwanted emissions of
active services**

**(2007 World Radiocommunication Conference, Agenda Item 1.20)**

**IB Docket No. 04-286**

The 2007 World Radiocommunication Conference (WRC-07) will address
Agenda Item 1.20, which calls for consideration of regulatory measures
for the protection of the Earth exploration-satellite service
(passive[^1]) from unwanted emissions of active services in the
following bands: 1 350-1 400 MHz, 1 427-1 452 MHz, 22.55-23.55 GHz,
30-31.3 GHz, 47.2-50.2 GHz and 50.4-52.6 GHz. These bands are allocated
for use in various FCC rule parts related to a number of radio services
including Part 25 (Satellite Communications), Part 27 (Miscellaneous
Wireless Communications Services, Part 87 (Aviation) Part 90 (Private
Land Mobile Radio Services), Part 95 (Personal Radio Services), and Part
101 (Fixed Microwave Services).

On April 27, 2006, the World Radiocommunication Conference Advisory
Committee (WRC-07 Advisory Committee) approved and submitted for
Commission consideration its recommendations with regard to a draft U.S.
proposal for WRC-07 Agenda Item 1.20 from the Executive Branch agencies.
[^2] At that time, the WRC-07 Advisory Committee indicated that it was
premature for the United States to assert that values proposed by the
Executive Branch Agencies are based on an assessment of the impact on
the relevant active services. The WRC-07 Advisory Committee
recommendations and the proposal from the Executive Branch agencies are
attached to this Public Notice.[^3] Subsequently, the Executive Branch
Agencies revised their proposal on Agenda Item 1.20 to account for some
of the WRC-07 Advisory Committee recommendations. The revised proposal
is provided in Annex III of this Notice.

In light of the requirement to formulate US proposals for the
approaching WRC-07[^4] and the progress of the technical studies on the
subject issue, the FCC seeks additional comment on the proposal from the
Executive Branch agencies.[^5] In particular, noting that the proposal
from the Executive Branch agencies includes specific, mandatory limits
on unwanted emissions for the individual transmitters in several of the
frequency bands listed in the table below, the FCC seeks to establish:

(a) What would be the impact of the proposed limits (in terms of
    performance, cost, weight, size, etc.) on systems in the specified
    frequency bands? To the extent available, please provide technical
    analyses in support of the comments.

(b) Can the systems operate without significant modifications to current
    system design within the limits proposed in the Executive Branch
    agencies' proposal, or will the proposed limits require significant
    modifications to system design? Are the differences between the
    emission limits in the Executive Branch proposal and the limits in
    the FCC rules significant enough to have an impact on the provision
    of current and future service applications in the affected bands? If
    so, please explain.

The table below lists the bands that may be affected by the Executive
Branch proposal; the services in those bands; and the relevant FCC rules
applicable to those bands.

+-----------------+--------------------+-------------------------------+
| Active service  | Affected           | FCC rule parts                |
| band            | Non-Federal        |                               |
|                 | Allocation         |                               |
+=================+====================+===============================+
| 1 350-1 400 MHz | 1390-1395          | PART 27---MISCELLANEOUS       |
|                 |                    | WIRELESS COMMUNICATIONS       |
|                 | FIXED              | SERVICES                      |
|                 |                    |                               |
|                 | MOBILE except      |                               |
|                 | aeronautical       |                               |
|                 | mobile             |                               |
+-----------------+--------------------+-------------------------------+
|                 | 1395-1400          | PART 95---PERSONAL RADIO      |
|                 |                    | SERVICES                      |
|                 | LAND MOBILE        |                               |
|                 | (medical telemetry |                               |
|                 | and medical        |                               |
|                 | telecommand)       |                               |
+-----------------+--------------------+-------------------------------+
| 1 427-1 429 MHz | 1427-1429.5        | PART 90---PRIVATE LAND MOBILE |
|                 |                    | RADIO SERVICES                |
|                 | LAND MOBILE        |                               |
|                 |                    | PART 95---PERSONAL RADIO      |
|                 | Fixed (telemetry)  | SERVICES                      |
+-----------------+--------------------+-------------------------------+
| 1 429-1 452 MHz | 1429.5-1432        | PART 90---PRIVATE LAND MOBILE |
|                 |                    | RADIO SERVICES                |
|                 | FIXED (telemetry)  |                               |
|                 |                    | PART 95---PERSONAL RADIO      |
|                 | LAND MOBILE        | SERVICES                      |
|                 | (telemetry)        |                               |
+-----------------+--------------------+-------------------------------+
|                 | 1432-1435          | PART 27---MISCELLANEOUS       |
|                 |                    | WIRELESS COMMUNICATIONS       |
|                 | FIXED              | SERVICES                      |
|                 |                    |                               |
|                 | MOBILE except      |                               |
|                 | aeronautical       |                               |
|                 | mobile             |                               |
+-----------------+--------------------+-------------------------------+
|                 | 1435-1452          | PART 87---AVIATION            |
|                 |                    |                               |
|                 | MOBILE             |                               |
|                 | (aeronautical      |                               |
|                 | telemetry)         |                               |
+-----------------+--------------------+-------------------------------+
| 22.55-23.55 GHz | 22.55-23.55        | PART 25---SATELLITE           |
|                 |                    | COMMUNICATIONS                |
|                 | INTER-SATELLITE    |                               |
|                 | US278              |                               |
+-----------------+--------------------+-------------------------------+
| 31-31.3 GHz     | 31-31.3            | PART 101---FIXED MICROWAVE    |
|                 |                    | SERVICES                      |
|                 | FIXED              |                               |
+-----------------+--------------------+-------------------------------+
| 50.4-51.4       | 50.4-51.4          | PART 25---SATELLITE           |
| GHz^2^          |                    | COMMUNICATIONS                |
|                 | FIXED-SATELLITE    |                               |
|                 | (Earth-to-space)   |                               |
+-----------------+--------------------+-------------------------------+
| 47.2-50.2 GHz   | 47.2-48.2          | PART 25---SATELLITE           |
| (Regions 2 and  |                    | COMMUNICATIONS                |
| 3)\             | FIXED-SATELLITE    |                               |
| 49.44-50.2      | (Earth-to-space)   |                               |
| GHz^2^ (Region  |                    |                               |
| 1)              | 48.2-50.2          |                               |
|                 |                    |                               |
|                 | FIXED-SATELLITE    |                               |
|                 | (Earth-to-space)   |                               |
+-----------------+--------------------+-------------------------------+
| 51.4-52.6 GHz   | 51.4-52.6          | PART 101---FIXED MICROWAVE    |
|                 |                    | SERVICES                      |
|                 | FIXED              |                               |
+-----------------+--------------------+-------------------------------+

In general, the emission limits proposed by the Executive Branch
Agencies are more restrictive than the emission limits in the existing
FCC rules. We note that in some cases it is difficult to compare the
limits because they are specified for different bandwidths.

The comments provided by interested parties will assist the FCC in its
upcoming consultations with the U.S. Department of State and NTIA in the
development of U.S. positions for WRC-07. As the recommendations that
are attached to this Public Notice may evolve in the course of
interagency discussions as WRC‑07 nears, they do not constitute a final
U.S. Government position on any issue.

The text of these recommendations is also available in the FCC's
Reference Information Center, Room CY-A257, 445 12^th^ Street, SW,
Washington, DC 20554 or by accessing the FCC's WRC-07 world wide web
site at: <http://www.fcc.gov/wrc-07>. Comments on the recommendations
may be filed by referencing IB Docket 04-286 using the Commission's
Electronic Comment Filing System (ECFS) or by filing paper copies.
Parties are encouraged to file electronically by following the
instructions at: <http://www.fcc.gov/cgb/ecfs>. Parties who choose to
file paper copies only should submit an original and four copies of each
filing. Guidelines and address for paper filings are available at:
<http://www.fcc.gov/osec>. In addition, please submit one copy of your
comments electronically or by paper to Alexander Roytblat, FCC WRC-07
Director, Federal Communications Commission, Room 6-A865, 445 12^th^
Street, SW, Washington, DC 20554; e-mail: WRC07@fcc.gov. Comments should
refer to IB Docket No. 04-286 and to WRC Agenda Item 1.20. The deadline
for comments on the recommendations is December 6, 2006. 

**ANNEX I**

I.  **Draft Preliminary Proposal for the WRC-07, Agenda Item 1.20
    developed by the Executive Branch Agencies on March 17, 2006 and
    provided by the National Telecommunications and Information
    Administration (NTIA)**

**Document WAC/095(27.04.06):**

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

**WRC-07 Agenda Item 1.20**[^6]**:** 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]{.underline}    |                       |                       |
|                       |                       |                       |
| 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]{.underline}   |                      |                       |
|                      |                      |                       |
| 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]{.underline}    |                       |                       |
|                       |                       |                       |
| 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.

**- FCC -**

**ANNEX II**

II. **Recommendations approved April 27, 2006 by WRC-07 Advisory
    Committee on the draft preliminary proposal for the WRC-07, Agenda
    Item 1.20 developed by the Executive Branch Agencies**

**Document WAC/105(27.04.06):**

**Comments of IWG-1 on Draft U.S. Proposal from Exec. Branch Agencies
on**

**WRC-07 Agenda Item 1.20**

IWG-1 has considered the terrestrial elements of the draft U.S. proposal
for WRC-07 Agenda Item 1.20 from the Executive Branch agencies. It
offers the following comments:

1\. IWG-1 observes that it is premature for the United States to assert,
in the background or in the reasons for any specific proposal, that
values proposed for the protection of the EESS (passive) are based on an
assessment of the impact on the relevant active service. To the extent
that any ITU-R studies have even considered the impact on the active
service involved -- a requirement of both Resolution 738 (WRC-03) and
the agenda item -- no conclusions have yet been reached, which calls
into question the proposals for specific levels at this time. The
terrestrial industry is continuing to address this question with respect
to the operation of stations in the 1350-1400 MHz, 1427-1452 MHz,
31-31.3 GHz and 51.4-52.6 GHz bands.

2\. IWG-1 is concerned with the proposal for mandatory limits on fixed
service station emissions into adjacent bands. For protection against
unacceptable interference caused by unwanted emissions, mandatory limits
may be without precedent in the RRs. The language in the Exec. Branch
agencies' proposals for new footnotes (including 5.AAA, 5.CCC, and
5.EEE) would appear to invite BR examination under Art. 11 of compliance
with unwanted emission limits. Even if BR examination is not what the
Exec. Branch agencies contemplate, the mandatory nature of the wording
does not clearly exclude examination, and has serious negative
implications for the operation and evolution of advanced services in the
affected active service bands. In Document WAC/096, a redline of the
Exec. Branch agencies' proposal for Agenda Item 1.20, IWG-1 offers
suggestions for the wording of the proposed footnotes that aligns the
notes generally with the approach taken by WRC-03 with respect to
protection of the radioastronomy service from detrimental interference
(see Resolution 739 (WRC-03)), and removes any suggestion that the
footnotes would require BR examination.

3\. IWG-1 concurs with proposals USA/ /3, 5, 7 and 13.

**[Document WAC/100(27.04.06):]{.underline}**

**Comments of IWG-2 on Draft U.S. Proposal from Exec. Branch Agencies
on**

**WRC-07 Agenda Item 1.20 (Document IWG-2/057)**

IWG-2 has considered the satellite elements of Document IWG-2/057, which
contains draft U.S. proposal for WRC-07 Agenda Item 1.20 from the
Executive Branch agencies. It offers the following comments:

1\. IWG-2 endorses the [NOC]{.underline} proposals for the bands
22.55-23.55 GHz and 30-31 GHz (inter-satellite service and
fixed-satellite service (Earth-to-space), respectively) that are
contained in Proposals USA/ /5 and USA/ /7.

2\. IWG-2 also endorses the SUP proposal for Resolution738 that is
contained in Proposal

USA/ /13.

3\. IWG-2 observes that it is premature for the United States to assert,
in the background or in the reasons for any specific proposal, that
values proposed for the protection of the EESS (passive) are based on an
assessment of the impact on the relevant active service. To the extent
that any ITU-R studies have even considered the impact on the active
service involved -- a requirement of both Resolution 738 (WRC-03) and
the agenda item -- no conclusions have yet been reached. The FSS
industry is continuing to address this question with respect to the
operation of earth stations in the 47.2-50.2 GHz FSS (Earth-to-space)
band.

4\. IWG-2 is concerned with the proposal for mandatory limits on FSS
earth station emissions into adjacent bands. For protection against
unacceptable interference caused by unwanted emissions, mandatory limits
may be without precedent in the RRs. The language in the Exec. Branch
agencies' proposals for new footnotes (including 5.BBB, 5.DDD, and
5.EEE) would appear to invite BR examination under Art. 11 of compliance
with unwanted emission limits. Even if BR examination is not what the
Exec. Branch agencies contemplate, the mandatory nature of the wording
does not clearly exclude examination, and has serious negative
implications for the operation and evolution of advanced services in the
affected active service bands. In Document WAC/096, a redline of the
Exec. Branch agencies' proposal for Agenda Item 1.20 (Doc. IWG-2/057),
IWG-2 offers suggestions for the wording of the proposed footnotes that
aligns the notes generally with the approach taken by WRC-03 with
respect to protection of the radioastronomy service from detrimental
interference (see Resolution 739 (WRC-03), and removes any suggestion
that the footnotes would subject FSS and space operations earth stations
to BR examination. The language of the alternative text was coordinated
with IWG-1, which has responsibility for the terrestrial service
elements.

5\. With respect to the proposal for an unwanted emission value for FSS
earth stations operating in the 47.2-50.2 GHz band (proposed note 5.DDD
in Proposal USA/ /10), it appears that the derivation of the 30 dBW/200
MHz level that is stated as needed to protect the EESS (passive) from
unwanted emissions into the 50.2-50.4 GHz band may have been based on
unrealistic assumptions regarding FSS deployment and parameters.
Furthermore, it should be emphasized in the proposal that the protection
level is a clear-sky level, and that FSS earth stations in the 47.2-50.2
GHz band can increase their transmit power density by TBD dB, to
overcome fading conditions without causing additional impact to the EESS
(passive) systems. IWG-2 emphasizes that it has no difficulty with the
concept of identifying an unwanted emission level that would protect the
EESS (passive) service in that band; at this time, however, that level
remains under discussion between interested representatives from both
the active service and passive service communities.

6\. There is an inconsistency between the language of No. 5.DDD in
Proposal USA/ /10 and the proposed modification to Article 5 in Proposal
USA/ /9. The former indicates that the note is to apply only to the
49.44-50.2 GHz portion of the 47.2-50.2 GHz band in Region 1, while the
latter applies No. 5.DDD to the entire 47.2-50.2 GHz band. IWG-2
recommends that this discrepancy be resolved, but as long as No. 5.DDD
reflects a satisfactory resolution of the matter addressed in Comment
No. 4 above, IWG-2 takes no position on how this discrepancy should be
resolved.

**ANNEX III**

III. **Revised Draft Preliminary Proposal for the WRC-07, Agenda Item
     1.20 developed by the Executive Branch Agencies on October 20, 2006
     and provided by the National Telecommunications and Information
     Administration (NTIA)**

**United States of America**

## DRAFT PROPOSAL FOR THE WORK OF THE CONFERENCE[^7]

**WRC-07 Agenda Item 1.20:** 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*)[^8] 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.

Regulatory certainty is achieved for the most problematic cases (6 of
the 13 cases where bands and services were identified for consideration
in Resolution **738**) by administrations limiting unwanted emissions
for cases where interference is likely to occur without some action
being taken. This is accomplished by RR provisions that apply to
administrations operating systems in these six band/services.
Administrations would then need to apply those limits in their
operations in order to be in compliance with their ITU treaty
obligations. A non-mandatory limit published by the ITU would provide
useful guidance to administrations but would not provide any level of
certainty.[^9] While the imposition of the limits will not guarantee
that the performance of the passive satellite networks will be
unimpaired as new active service transmitters in nearby bands are
implemented, the Administration-imposed limits will provide some
certainty that the worst interfering cases will be avoided. Second, at
this stage of implementation of active services in many of the nearby
bands, the emission limits are part of the design considerations from
the start rather than retrofitting or modifying existing equipment
designs.

The proposals do not require, and no provision is made for, ITU
Radiocommunication Bureau examination, or enforcement of these limits.

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 in the 1 400--1 427 MHz band 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 not exceed --45
dBW/27 MHz. This provision shall apply only to fixed service stations
brought into use after 9 November 2007. The Bureau shall make neither
examination nor finding with respect to this provision under either
Article **9** or **11**.

**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. 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.

**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. in the 1 400--1 427 MHz band of any
earth station in the space operation service (Earth-to-space) operating
in the band 1 427--1 429 MHz shall not exceed 8 dBW/27 MHz. This
provision shall apply only to space operation service earth stations
brought into use after 9 November 2007 The Bureau shall make neither
examination nor finding with respect to this provision under either
Article **9** or **11**.

**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. 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.

+-----------------------+-----------------------+-----------------------+
| 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 in the 31.3--31.5 GHz band delivered to the
antenna of any station in the fixed service operating in the band
31.0--31.3 GHz shall not exceed --38 dBW/100 MHz (see also No.
**5.543A**). This provision shall apply only to fixed service stations
brought into use after 9 November 2007. The Bureau shall make neither
examination nor finding with respect to this provision under either
Article **9** or **11**.

**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. in the 50.2-50.4 GHz band of any earth
station in the fixed-satellite service operating either in the band
47.2-50.2 GHz or in the band 50.4-51.4 GHz shall not exceed 43 dBW/200
MHz under clear sky conditions, or 49 dBW/200 MHz under fading
conditions. This provision shall apply only to fixed-satellite service
earth stations brought into use after 9 November 2007. The Bureau shall
make neither examination nor finding with respect to this provision
under either Article **9** or **11**.

**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 in the 52.6--54.25 GHz band delivered to the
antenna of any station in the fixed service operating in the band
51.4--52.6 GHz shall not exceed --33 dBW/100 MHz. This provision shall
apply only to fixed service stations brought into use after 9 November
2007. The Bureau shall make neither examination nor finding with respect
to this provision under either Article **9** or **11**.

**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]: ITU Radio Regulations define a "passive sensor" as a measuring
    instrument in the earth exploration-satellite service or in the
    space research service by means of which information is obtained
    through reception of radio waves of natural origin. *See*
    *International Telecommunication Union Radio Regulations,* Volume 1,
    Articles 1.182 and 1.183. *Passive service* refers herein to any
    radiocommunication service, such as the EESS (passive), that does
    not involve transmitters. In contrast, an *active service* involves
    both transmitters and receivers.

[^2]: The WRC-07 Advisory Committee was established by the FCC in
    January 2004 to assist the FCC in developing proposals for WRC-07.
    Since its inception, the WRC-07 Advisory Committee has developed and
    submitted recommendations and preliminary views for Commission
    consideration. *See, e.g., The FCC's Advisory Committee for the 2007
    World Radiocommunication Conference Proposes Preliminary Views on
    WRC-07 Issues*, Public Notice, DA 04-1698 (rel. June 14, 2004)
    (Int'l Bur. 2004).

[^3]: These documents are also available through the FCC's WRC-07
    website at: <http://www.fcc.gov/wrc-07>.

[^4]: WRC-07 is scheduled for 22 October to 16 November 2007.

[^5]: *FCC Seeks Comment on recommendations Approved by the Advisory
    Committee for the 2007 World Radiocommunication Conference*, Public
    Notice, DA 06-960 (rel. May 1, 2006) (Int'l Bur. 2006).

[^6]: This is a counter proposal to the one contained in FCC Public
    Notice DA 05--1011 as WAC/052(04.04.05).

[^7]: This is a second version of the Executive Branch proposal (October
    2006)

[^8]: Protection values are contained in Resolution 738 considering f
    and g as follows : *f)* that according to Recommendation
    ITU‑R SM.1633, the EESS (passive) in the band 31.3-31.5 GHz can be
    protected if the unwanted emissions of fixed-service systems (except
    high-altitude platform stations (HAPS)) operating in the band
    31.0-31.3 GHz do not exceed --38 dBW in a 100 MHz reference
    bandwidth in the band 31.3-31.5 GHz;

    *g)* that according to Recommendation ITU‑R SM.1633, the EESS
    (passive) in the band 52.6-54.25 GHz can be protected if the
    unwanted emissions of fixed-service systems operating in the band
    51.4-52.6 GHz do not exceed --33 dBW in a 100 MHz reference
    bandwidth in the band 52.6-54.25 GHz;

[^9]: Administrations generally adhere to their treaty obligations
    whether there is ITU enforcement or not. Regulators have
    understandably stated that provisions in the RR allowing a finding
    by the ITU of harmful interference to passive satellite service from
    unwanted emissions would be unworkable and unwise.