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  **World Radiocommunication Conference (WRC-07)\  ![](media/image1.png){width="1.9270833333333333in"
  Geneva, 22 October - 16 November 2007**          height="0.8125in"}

                                                   

                                                   

  **PLENARY MEETING**                              **Addendum 6 to Document 39-E**

                                                   **28 August 2007**

                                                   **Original: Arabic**

  Arab States Common Proposals                     

  proposals for the work of the conference         

  Agenda item 1.7                                  
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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)**

Introduction

Agenda item 1.7 addresses two issues related to the mobile-satellite
service (MSS) use of the band 1 668-1 675 MHz. Issue A relates to
sharing between mobile earth stations (MESs) and systems in the space
research service (SRS) (passive) in the band 1 668-1 668.4 MHz. Issue B
relates to sharing between the mobile service (MS) and the MSS in the
band 1 668.4-1 675 MHz.

# Issue A

The Arab States propose the use of the existing coordination threshold
based on the e.i.r.p. of a mobile earth station (MES) of 2.2 dB(W/4
kHz). This approach will consequently cap the protection to be provided
to new SRS (passive) systems.

APPENDIX 5 (Rev.WRC‑03)

Identification of administrations with which coordination is to be
effected or\
agreement sought under the provisions of Article 9

TABLE 5-1     (Rev.WRC‑03)

Technical conditions for coordination\
(see Article 9)

**MOD** ARB/39A6/1

TABLE 5-1     (Rev.WRC‑07)

+-----+-----------+-----------+-----------------+--------+-----------+
| R   | Case      | Frequency | Thre            | Calcul | Remarks   |
| efe |           | bands\    | shold/condition | ation\ |           |
| ren |           | (and      |                 | method |           |
| ce\ |           | Region)   |                 |        |           |
| of\ |           | of the    |                 |        |           |
| A   |           | service\  |                 |        |           |
| rti |           | for which |                 |        |           |
| cle |           | coor      |                 |        |           |
| 9   |           | dination\ |                 |        |           |
|     |           | is sought |                 |        |           |
+-----+-----------+-----------+-----------------+--------+-----------+
| No. | A station | Frequency | Bandwidths      | Check  |           |
| **9 | in a GSO  | bands for | overlap         | by     |           |
| .13 | satellite | which a   |                 | using  |           |
| **\ | network   | footnote  | For the band    | the    |           |
| GS  | in the    | refers to | 1               | as     |           |
| O/n | frequency | No.*      | 668-1 668.4 MHz | signed |           |
| on‑ | bands for | * 9.11A** | with respect to | frequ  |           |
| GSO | which a   | or No.    | MSS network     | encies |           |
|     | footnote  | **9.13**  | coordination    | and    |           |
|     | refers to |           | with SRS        | band   |           |
|     | No.       |           | (passive)       | widths |           |
|     | **9.11A** |           | networks, in    |        |           |
|     | or        |           | addition to     |        |           |
|     | No.       |           | bandwidth       |        |           |
|     | **9.13**, |           | overlap, the    |        |           |
|     | in        |           | e.i.r.p. of an  |        |           |
|     | respect   |           | MES in an MSS   |        |           |
|     | of any    |           | network exceeds |        |           |
|     | other     |           | 2.2 dBW in a    |        |           |
|     | non-GSO   |           | reference       |        |           |
|     | satellite |           | bandwidth of    |        |           |
|     | network,  |           | 4 kHz           |        |           |
|     | with the  |           |                 |        |           |
|     | exception |           |                 |        |           |
|     | of        |           |                 |        |           |
|     | coo       |           |                 |        |           |
|     | rdination |           |                 |        |           |
|     | between   |           |                 |        |           |
|     | earth     |           |                 |        |           |
|     | stations  |           |                 |        |           |
|     | operating |           |                 |        |           |
|     | in the    |           |                 |        |           |
|     | opposite  |           |                 |        |           |
|     | direction |           |                 |        |           |
|     | of        |           |                 |        |           |
|     | tra       |           |                 |        |           |
|     | nsmission |           |                 |        |           |
+-----+-----------+-----------+-----------------+--------+-----------+
| \   |           |           |                 |        |           |
| ... |           |           |                 |        |           |
+-----+-----------+-----------+-----------------+--------+-----------+

**Reasons:** To ensure the protection to be provided to the space
research service (SRS) (passive).

# Issue B

The Arab States propose to modify Resolution 744 (WRC-03). The use of
the MS allocation is to be limited to transportable radio-relay systems
(with the exception of the territory of the administration mentioned in
the *resolves* section of this Resolution), and a hard limit is to be
placed on the e.i.r.p. spectral density of transportable radio-relay
stations in Resolution 744 (WRC-03) for example, as shown below:

**MOD** ARB/39A6/2

RESOLUTION 744 (WRC-07)

Sharing between the mobile-satellite service (Earth-to-space) and the
space\
research (passive) service in the band 1 668-1 668.4 MHz and 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 in the band 1 668-1 668.4 MHz, mobile earth stations and space
research (passive) stations are subject to coordination
under No. **9.11A**;

*f)* that the band 1 670-1 675 MHz is currently planned for use in the
United States of America for the fixed and mobile services,

resolves

1 that the use of the band 1 668.4-1 675 MHz by systems in the mobile
service is limited to transportable radio-relay systems;

2 that administrations operating such systems shall limit the e.i.r.p.
spectral density radiated in the direction of the geostationary arc to
--27 dB(W/4 kHz) in this band;

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

4 that *resolves* 1 and 2 do not apply to fixed and mobile stations
operating in the United States of America.

**Reasons:** To provide adequate protection to the mobile-satellite
service from the mobile service.

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