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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 18 to Document 10-E**

                                                   **22 May 2007**

                                                   **Original: English**

                                                   

  EUROPEAN COMMON PROPOSALS FOR\                   
  THE WORK OF THE CONFERENCE                       

  PART 18                                          

  Agenda item 1.18                                 
  ------------------------------------------------ ----------------------------------------------------

1.18 to review pfd limits in the band 17.7-19.7 GHz for satellite
systems using highly inclined orbits, in accordance with Resolution
**141 (WRC‑03)**

### Introduction {#introduction .heading_b1}

Agenda item 1.18 deals with sharing between non‑GSO satellite systems in
the fixed-satellite service (FSS), as described in *considering g)* of
Resolution 141 (non‑GSO satellite systems using highly-inclined orbits
having an apogee altitude greater than 18 000 km and an orbital
inclination between 35 and 145) and stations in the fixed service (FS)
in the 17.7-19.7 GHz band.

Resolution 141 invites to conduct the appropriate technical studies to
determine whether the current pfd limits for non‑GSO systems in the FSS
in Article 21 are adequate to protect the fixed service in the
17.7-19.7 GHz band from non-geostationary systems described in
*considering g)* without unduly constraining the use of these non‑GSO
FSS systems.

Based on studies undertaken in Working Party 4-9S, Europe is of the view
that these current Article 21 pfd limits are not adequate to protect the
FS. Based on further studies undertaken in Working Party 4-9S, Europe is
of the view that a pfd value of --123 dB(W/m^2^/MHz) at low elevation
angles (below 5°) and a pfd value of --110 dB(W/m^2^/MHz) at high
elevation angles (above 25°) are adequate for the non-GSO FSS systems
described in Resolution 141 to protect the FS in the 17.7-19.7 GHz band.
Europe is also of the view that these proposed new limits do not unduly
constrain the use of these non-GSO FSS systems.

Resolution 141 also invites to determine whether there are technical and
operational measures in the band 17.7-19.7 GHz that could be implemented
in the fixed service to mitigate interference from FSS space stations as
described in *considering g)*. Based on considerations discussed in
Working Party 4-9S, Europe is of the view that these mitigation
techniques are impractical for existing FS links and that therefore
these mitigation techniques cannot be considered when deriving pfd
limits for Agenda item 1.18.

For the reasons above, Europe proposes to change the Article 21 pfd
limits in the 17.7-19.7 GHz band for the non-GSO FSS systems described
in Resolution 141.

As a consequence, Resolution 141 is proposed for suppression, taking
into account the "*instructs the Radiocommunications Bureau*".

ARTICLE 21

Terrestrial and space services sharing frequency bands above 1 GHz

Section V -- Limits of power flux-density from space stations

**MOD** EUR/10A18/1

TABLE **21-4**  *(continued)*     (WRC-07)

+---------------+---------------+------+-------------+--------+------+
| Frequency     | Service\*     | L    |             |        | R    |
| band          |               | imit |             |        | efer |
|               |               | in   |             |        | ence |
|               |               | dB   |             |        | b    |
|               |               | (W/m |             |        | andw |
|               |               | ^2^) |             |        | idth |
|               |               | for  |             |        |      |
|               |               | ang  |             |        |      |
|               |               | les\ |             |        |      |
|               |               | of   |             |        |      |
|               |               | arr  |             |        |      |
|               |               | ival |             |        |      |
|               |               | ()   |             |        |      |
|               |               | a    |             |        |      |
|               |               | bove |             |        |      |
|               |               | the  |             |        |      |
|               |               | ho   |             |        |      |
|               |               | rizo |             |        |      |
|               |               | ntal |             |        |      |
|               |               | p    |             |        |      |
|               |               | lane |             |        |      |
+---------------+---------------+------+-------------+--------+------+
|               |               | 0-5  | 5-25        | 25-90  |      |
+---------------+---------------+------+-------------+--------+------+
| \...          |               |      |             |        |      |
+---------------+---------------+------+-------------+--------+------+
| 17.7-19.3 GHz | Fix           | --1  | --115 +     | --105  | 1    |
| ^7,\ 8^       | ed-satellite\ | 15   | 0.5( --     |   ^13^ | MHz  |
|               | (spa          | ^13^ | 5)  ^13^    |        |      |
|               | ce-to-Earth)\ |      |             | or     |      |
|               | (geostation   | or   | or          |        |      |
|               | ary-satellite |      |             | --105  |      |
|               | orbit)        | -    | --115 --    |   ^12^ |      |
|               |               | -115 | *X* +       |        |      |
|               | Fix           | --   | ((10 +      |        |      |
|               | ed-satellite\ | *    | *X*)/20) (  |        |      |
|               | (sp           | X  * | -- 5)  ^12^ |        |      |
|               | ace-to-Earth) | ^12^ |             |        |      |
|               |               |      |             |        |      |
|               | (n            |      |             |        |      |
|               | on-geostation |      |             |        |      |
|               | ary-satellite |      |             |        |      |
|               | orbit) ^22^   |      |             |        |      |
|               |               |      |             |        |      |
|               | Meteorologi   |      |             |        |      |
|               | cal-satellite |      |             |        |      |
|               | (sp           |      |             |        |      |
|               | ace-to-Earth) |      |             |        |      |
+---------------+---------------+------+-------------+--------+------+
| 17.7-19.3 GHz | > Fix         | -    | --123 +     | --110  | 1    |
| ^7,^ ^8^      | ed-satellite\ | -123 | 0.65( -- 5) |        | MHz  |
|               | > (spa        |      |             |        |      |
|               | ce-to-Earth)\ |      |             |        |      |
|               | > (n          |      |             |        |      |
|               | on-geostation |      |             |        |      |
|               | ary-satellite |      |             |        |      |
|               | > orbit) ^21^ |      |             |        |      |
+---------------+---------------+------+-------------+--------+------+
| 19.3-19.7 GHz | > Fix         | -    | --123 +     | --110  | 1    |
|               | ed-satellite\ | -123 | 0.65( -- 5) |        | MHz  |
|               | > (spa        |      |             |        |      |
|               | ce-to-Earth)\ |      |             |        |      |
|               | > (n          |      |             |        |      |
|               | on-geostation |      |             |        |      |
|               | ary-satellite |      |             |        |      |
|               | > orbit) ^21^ |      |             |        |      |
+---------------+---------------+------+-------------+--------+------+
| 19.3-19.7 GHz | > Fix         | -    | --115 +     | --105  | 1    |
|               | ed-satellite\ | -115 | 0.5( -- 5)  |        | MHz  |
|               | > (sp         |      |             |        |      |
|               | ace-to-Earth) |      |             |        |      |
|               | >             |      |             |        |      |
|               | > (geostation |      |             |        |      |
|               | ary-satellite |      |             |        |      |
|               | > orbit)      |      |             |        |      |
|               | >             |      |             |        |      |
|               | > Fix         |      |             |        |      |
|               | ed-satellite\ |      |             |        |      |
|               | > (spa        |      |             |        |      |
|               | ce-to-Earth)\ |      |             |        |      |
|               | > (n          |      |             |        |      |
|               | on-geostation |      |             |        |      |
|               | ary-satellite |      |             |        |      |
|               | > orbit) ^22^ |      |             |        |      |
+---------------+---------------+------+-------------+--------+------+
| 22.55-23.55   | Fix           | -    | --115 +     | --105  | 1    |
| GHz           | ed-satellite\ | -115 | 0.5( -- 5)  |        | MHz  |
|               | (sp           |      |             |        |      |
| 24.45-24.75   | ace-to-Earth) |      |             |        |      |
| GHz           |               |      |             |        |      |
|               | Earth         |      |             |        |      |
| 25.25-27.5    | explorat      |      |             |        |      |
| GHz           | ion-satellite |      |             |        |      |
|               | (sp           |      |             |        |      |
|               | ace-to-Earth) |      |             |        |      |
|               |               |      |             |        |      |
|               | In            |      |             |        |      |
|               | ter-satellite |      |             |        |      |
|               |               |      |             |        |      |
|               | Space         |      |             |        |      |
|               | research\     |      |             |        |      |
|               | (sp           |      |             |        |      |
|               | ace-to-Earth) |      |             |        |      |
+---------------+---------------+------+-------------+--------+------+
| \...          |               |      |             |        |      |
+---------------+---------------+------+-------------+--------+------+

^7^ **21.16.1** The equality of right to operate when a frequency band
is allocated in different Regions to different services of the same
category is established in No.** 4.8**. Therefore, any limits concerning
inter-Regional interference which may appear in ITU-R Recommendations
should, as far as practicable, be observed by administrations.

^8^ **21.16.2** In addition to the limits given in Table **21-4**, in
the band 18.6-18.8 GHz the sharing environment within which the Earth
exploration-satellite (passive) and space research (passive) services
shall operate is defined by the following limitations on the operation
of the fixed-satellite service: the power flux-density across the
200 MHz band 18.6‑18.8 GHz produced at the surface of the Earth by
emissions from a space station under assumed free-space propagation
conditions shall not exceed --95 dB(W/m2), except for less than 5% of
time, when the limit may be exceeded by up to 3 dB. The provisions of
No. **21.17** do not apply in this band.     (WRC‑2000)

12 **21.16.6** The function *X* is defined as a function of the number,
*N*, of satellites in the non‑geostationary satellite constellation in
the fixed-satellite service, as follows:

$X = 0$ dB for      *N* ≤ 50

$X = \frac{5}{\text{119}}\left( N - \text{50} \right)$ dB for  50 \< *N*
≤ 288

$X = \frac{1}{\text{69}}\left( N + \text{402} \right)$ dB for      *N*
\> 288

In the band 18.8-19.3 GHz, these limits apply to emissions of any space
station in a non‑geostationary-satellite system in the fixed-satellite
service for which complete coordination or notification information, as
appropriate, has been received by the Radiocommunication Bureau after 17
November 1995, and which was not operational by that
date.     (WRC‑2000)

^1^3 **21.16.6A** These limits apply to emissions of a space station in
the meteorological-satellite service and of a geostationary satellite in
the fixed-satellite service. They also apply to emissions of any space
station in a non-geostationary-satellite system in the fixed-satellite
service in the band 18.8-19.3 GHz for which complete coordination or
notification information has been received by the Radiocommunication
Bureau by 17 November 1995, or which was in operation by that
date.     (WRC‑2000)

^21^ **21.16.19** These limits apply to non-geostationary
fixed-satellite service space stations employing an orbit with an
inclination angle between 35 and 145 and apogee altitude greater than
18 000 km and where complete advance publication information has been
received by the Radiocommunication Bureau after 5 July 2003. (WRC-07)

^22^ **21.16.20** These limits apply to non‑geostationary
fixed-satellite service space stations that are not covered by
No. **21.16.19**.     (WRC-07)

**Reasons:** The proposed pfd limits (--123/--110 dB(W/m^2^/MHz)) have
been derived for non‑geostationary fixed-satellite service space
stations employing an orbit with an inclination angle between 35 and 145
and apogee altitude greater than 18 000 km (as described in Resolution
141).

The band 17.7-19.7 GHz is split in two bands (17.7-19.3 GHz and
19.3-19.7 GHz) as footnotes 21.16.1 *and* 21.16.2 *apply to the band
17.7-19.3 GHz only.*

**SUP** EUR/10A18/2

RESOLUTION 141 (WRC‑03)

Sharing between certain types of non-geostationary-satellite systems\
in the fixed-satellite service and stations in the fixed service\
in the 17.7-19.7 GHz band

**Reasons:** Resolution 141 (WRC-03) is proposed for suppression after
adoption of the above pfd limits and two new footnotes are proposed to
carry forward the condition in Resolution 141 (WRC‑03) that the limits
agreed at WRC-07 would apply to non-GSO FSS for which complete advance
publication information has been received after 5 July 2003.

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