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+-------+--------------------------------------+-------------+--------+
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|       | **WRC-07 AGENDA ITEM 7.2:            |             |        |
|       | PRELIMINARY PROPOSALS FOR THE WORK   |             |        |
|       | OF THE CONFERENCE**                  |             |        |
+-------+--------------------------------------+-------------+--------+
|       | **(Item on the Agenda: 4.1)**        |             |        |
+-------+--------------------------------------+-------------+--------+
|       | **(Document submitted by the         |             |        |
|       | delegation of Untied States of       |             |        |
|       | America)**                           |             |        |
+-------+--------------------------------------+-------------+--------+

**Agenda item 7.2**

7.2 To recommend to the Council items for inclusion in the agenda for
the next WRC, and to give its views on the preliminary agenda for the
subsequent conference and on possible agenda items for future
conferences, taking into account Resolution **803 (WRC-03)**

**Introduction**

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

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

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

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

**Proposal**

United States proposes to submit a new agenda item on considering the
modification of the primary mobile service allocation in the 37-38 GHz
band to exclude aeronautical mobile stations to be considered at
WRC-2011, as shown in the attachment

**ATTACHMENT**

**PROPOSAL FOR ADDITIONAL AGENDA ITEM PROVIDING CONSIDERING THE
MODIFICATION OF THE PRIMARY MOBILE SERVICE ALLOCATION IN THE 37-38 GHZ
BAND TO EXCLUDE AERONAUTICAL MOBILE STATIONS**

Subject: Proposed Future WRC Agenda Item for WRC-2011 considering the
modification of the primary mobile service allocation in the 37-38 GHz
band to exclude aeronautical mobile stations.

**Origin**: United States of America

Proposal: To consider modifying the primary mobile service allocation in
the 37-38 GHz band to exclude aeronautical mobile stations, or to take
such other regulatory action as needed to protect the other primary
services in the band from interference from the aeronautical mobile
service, taking into account the results of ITU-R studies and Resolution
\[USA-03\].

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

***Radiocommunication services concerned:*** SRS, FSS, FS and MS

***Indication of possible difficulties:*** None foreseen

***Previous/ongoing studies on the issue:*** Recommendation ITU-R
SA.1016 highlights the difficulty of sharing between aeronautical mobile
station and space research service stations in other bands. Specific to
the 37-38 GHz band, Working Party 7B has done some preliminary studies
that indicate similar sharing concerns.

***ITU-R Study Groups concerned:*** SG7, SG4, SG8 and SG9

ITU resource implications, including financial implications (refer to
CV126): Mimimal

***Common regional proposal:*** Yes/No ***Multicountry proposal:***
Yes/No

Number of countries:

***Remarks***

**Proposal:**

**MOD** USA/ / 1

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

Agenda for the 2011 World Radiocommunication Conference

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

**add** USA/ / 2

**2.XD** To consider modifying the primary mobile service allocation in
the 37-38 GHz band to exclude aeronautical mobile stations, or to take
such other regulatory action as needed to protect the other primary
services in the band from interference from the aeronautical mobile
service, taking into account the results of ITU-R studies and Resolution
\[USA-03\].

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

**ADD** USA/ /3

RESOLUTION \[USA-03\] (WRC-07)

Protection of Primary Services in the Band 37-38 GHz

The World Radiocommunication Conference (Geneva, 2007),

considering

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

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

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

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

recognizing

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

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

and noting

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

*resolves*

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

2 to recommend that WRC-11 review the results of the studies under
*resolves* 1 and consider the inclusion of any appropriate compatibility
criteria within the Radio Regulations or appropriate modifications to
the Table of Frequency Allocations, based on proposals from
administrations,

*invites administrations*

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

*invites ITU-R*

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

*instructs the Secretary-General*

to bring this Resolution to the attention of the international and
regional organizations concerned.

**Reasons:** Future manned and unmanned space research missions will
require access to the wider bandwidth available in this band.
Aeronautical mobile stations are capable of causing unacceptable
interference when they are within line-of-sight of a receiver operating
in the space research service, and such interference levels may exist
for extended periods, thus jeopardizing the success of manned or
scientific missions. Excluding aeronautical mobile systems in the 37-38
GHz band, or the establishment of appropriate compatibility criteria,
may be necessary to protect systems operating under a primary service
allocation in the band from harmful interference. This resolution
provides guidance on the ITU-R studies required in support of the
proposed WRC-11 agenda item.