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| **X      |                                   | **OE      |          |
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| OF       |                                   | VII.4.2** |          |
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|          |                                   | *CCP.II-R |          |
| **CONS   |                                   | ADIO/doc. |          |
| ULTATIVE |                                   | 1438/07** |          |
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| OMMITTEE |                                   | **18 June |          |
| II:**    |                                   | 2007**    |          |
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| COMMUNIC |                                   | Original: |          |
| ATIONS** |                                   | English** |          |
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| **I      |                                   |           |          |
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| BROADC   |                                   |           |          |
| ASTING** |                                   |           |          |
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| merica** |                                   |           |          |
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|          | **WRC-07 AGENDA ITEM 1.7: DRAFT   |           |          |
|          | PROPOSALS FOR THE WORK OF THE     |           |          |
|          | CONFERENCE**                      |           |          |
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|          | **(Item on the Agenda: 4.1)**     |           |          |
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|          | **(Document submitted by the      |           |          |
|          | delegation of United States of    |           |          |
|          | America)**                        |           |          |
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## Agenda item 1.7

## 

## 1.7 To consider the results of ITU‑R studies regarding sharing between the mobile-satellite service and the SRS (passive) in the band 1 668-1 668.4 MHz, and between the mobile-satellite service and the mobile service in the band 1 668.4-1 675 MHz in accordance with Resolution 744 (WRC‑03)

Background information

**(Issue A)** The band 1 668-1 668.4 MHz is allocated to the space
research (passive) service (SRS (passive)) and the mobile-satellite
service (MSS) (Earth-to-space). The space research allocation may be
used by space-based radio astronomy applications, as part of space very
long baseline interferometry systems (S-VLBI). The band 1 668-1 668.4
MHz is a part of the band, 1 660.5-1 668.4 MHz, allocated to the SRS
(passive). However S-VLBI spaceborne receivers typically receive over a
wider frequency band because a wider band is desirable for increasing
the sensitivity of systems and also to observe highly red-shifted
objects.

The potential for interference from mobile earth stations (MES)
operating in the MSS to the S‑VLBI systems has been studied by ITU‑R, in
accordance with Resolution 744. The studies concluded that to ensure
protection of future SRS (passive) systems operating in highly
elliptical orbits, with an apogee of 150 000 km and higher, the power
density of MESs operating in the GSO MSS networks should not exceed to
--12.5 dB(W/4 kHz) in any part of the frequency band 1 668-1 668.4 MHz.

**(Issue B)** The band 1 668.4-1 675 MHz is allocated to the fixed and
mobile services on a primary basis. WRC-03 allocated to MSS the bands
1 518-1 525 MHz (space-to-Earth) and 1 668.4-1 675 MHz (Earth-to-space).
In allocating the band 1 668.4-1 675 MHz to the MSS, WRC-03 recognized
that this allocation cannot be used in the United States. Specifically,
WRC-03 recognized that constraints on the MSS in the corresponding
downlink band 1 518-1 525 MHz (see RR 21.16 and 5.348B) preclude the
feasibility of using the 1 668-1 675 MHz for MSS uplinks in the United
States. WRC-03 further recognized that the United States intends to
implement systems in the existing fixed and mobile allocation in the
1 668-1 675 MHz and that these systems must not be constrained by the
new MSS allocation. To that end, WRC-03 adopted Resolution 744 (WRC‑03).
In accordance with the *recommends* of Resolution 744 (WRC-03), the
studies conducted under this resolution did not consider sharing between
MSS and mobile services in the United States.

The United States therefore, proposes to maintain the *resolves* of
Resolution 744 as adopted at WRC-03.

**MOD** USA/ /1 (Published by ITU as USA/5/32)

**ARTICLE 5**

**Frequency Allocations**

**Section IV -- Table of Frequency Allocations**

(See No.2.1)

1 660-1 710 MHz

**ADD** USA/ /2 (Published by ITU as USA/5/33)

**5.379F** In order to protect the space research service (passive) in
the band 1 668-1 668.4 MHz the maximum emission power density of any
mobile earth station in a mobile-satellite service network in the
geostationary-satellite orbit network operating in this band, shall not
exceed in any part of the frequency band 1 668-1 668.4 MHz.

**Reasons:** To ensure the protection of and future S-VLBI systems
operating in the SRS (passive).

**MOD** USA/ /3 (Published by ITU as USA/5/34)

**5.379D** For sharing of the band 1 668-1 675 MHz between the
mobile-satellite service and the fixed and mobile services,
Resolution **744 (WRC‑03)** shall apply.     (WRC-07)

**Reasons:** Studies under Resolution 744 have concluded with regard to
the SRS (passive).

**MOD** USA/ /4 (Published by ITU as USA/5/35)

RESOLUTION 744 (Rev.WRC-07)

Sharing between the mobile-satellite service (Earth-to-space) and the
fixed and\
mobile services in the band 1 668.4-1 675 MHz

The World Radiocommunication Conference (Geneva, 2007),

Considering

*a)* that WRC-03 made a global allocation to the mobile-satellite
service (MSS) (Earth-to-space) in the band 1 668-1 675 MHz and a global
allocation to the MSS (space-to-Earth) in the band 1 518-1 525 MHz;

*b)* that due to sharing conditions between MSS (space-to-Earth) and the
aeronautical mobile service for telemetry in the band 1 518-1 525 MHz
(see No. **5.348B**), MSS operation in the United States of America is
unlikely to be feasible;

*c)* that the above constraints on the MSS in the band 1 518-1 525 MHz
therefore limit the possible use of the band 1 668-1 675 MHz by the MSS
in the United States of America;

*d)* that the band 1 660.5-1 668.4 MHz is allocated to the space
research (passive) service;

*e)* that the band 1 670-1 675 MHz is used in the United States of
America for the fixed and mobile services,

considering further

that the band 1 668.4-1 675 MHz is allocated to the fixed and mobile
services,

resolves

that, in the band 1 670-1 675 MHz, stations in the MSS shall not claim
protection from fixed and mobile stations operating within the United
States of America.

**Reasons:** The studies called for in Resolution 744 (WRC-03) have been
completed. No further action is required.