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| **World Radiocommunication Conference          | ![](media/im        |
| (WRC-07)\                                      | age1.png){width="1. |
| Geneva, 22 October - 16 November 2007**        | 9270833333333333in" |
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| **PLENARY MEETING**                            | **Addendum 12 to**  |
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|                                                | **Document 5-E**    |
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|                                                | **7 September       |
|                                                | 2007**              |
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|                                                | **Original:         |
|                                                | English**           |
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| United States of America                       |                     |
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| PROPOSALS FOR THE WORK OF THE CONFERENCE       |                     |
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| Agenda item 7.2                                |                     |
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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
Radiocommunication 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 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.

The 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-11, as shown in the attachment.

**Attachment**: 1

ATTACHMENT

Proposal for an additional agenda item 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-11 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        
  **\[USA-03\]** **(WRC-07)**         

  ***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 stations 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.           

  ***Studies to be carried out by:*** ***with the participation of:*** SG
  SG 7                                4, SG 8 and SG 9

  ***ITU-R Study Groups               
  concerned:* **SG 7, SG 4, SG 8 and  
  SG 9                                

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

  ***Common regional proposal:*** No  
  ***Multicountry proposal:*** No\    
  ***Number of countries:***          

  ***Remarks***                       
  ----------------------------------- -----------------------------------

**MOD** USA/5A12/1

RESOLUTION 803 (Rev.WRC-0~~3~~[7]{.underline})

Agenda for the 2011 World Radiocommunication Conference

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

...

**ADD** USA/5A12/2

**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
**\[USA-03\]** **(WRC-07)**;

...

**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/5A12/3

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

*a)* 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);

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

noting

that aeronautical mobile service systems are currently neither 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.

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