# United States of America

**DRAFT PROPOSALS FOR THE WORK OF THE CONFERENCE**[^1]

**Agenda Item 1.2 (Res 746)**: to consider allocations and regulatory
issues related to the Earth exploration-satellite (passive) service,
space research (passive) service and the meteorological satellite
service in accordance with Resolutions **746**  **(WRC‑03)** and **742**
**(WRC‑03)**;

**Background Information**: This proposal addresses ***resolves 1* of**
Resolutions **746** **(WRC‑03)**, "to invite ITU-R to conduct sharing
analyses between geostationary meteorological satellites operating in
the space-to-Earth direction and the fixed, fixed-satellite and mobile
services in the band 18.0-18.4 GHz to define appropriate sharing
criteria with a view to extending the current 18.1-18.3 GHz
geostationary meteorological satellite allocation in the space-to-Earth
direction to 300 MHz of contiguous spectrum." Presently the
meteorological-satellite (MetSat) service (space-to-Earth), limited to
the geostationary-satellite orbit (GSO), is allocated by footnote
**5.519** in the band 18.1-18.3 GHz. The band is allocated on a primary
basis to the fixed-satellite service (FSS), the fixed service and the
mobile service in all three Regions and these allocations also exist for
these same services in the band 17.8-18.1 GHz in all Regions. In both
bands, the FSS is allocated in both the space-to-Earth and
Earth-to-space directions. Additionally, in the 18.1-18.4 GHz band, the
FSS (space-to-Earth) allocation has associated with it Nos. **5.484A**
and **5.516B**. The first provision applies to non-Geostationary FSS
satellite systems. The latter provision states that the band 18.3-19.3
GHz has been identified for use by high-density applications in the FSS
in Region 2.

WP-7B has been the lead ITU-R group concerned with analyzing the sharing
potential with other services in the band and it has exchanged several
Liaison Statements with WP-4A. As a consequence of the information
provided by WP-4A, those involved in the design of the next generation
GSO meteorological satellites have optimized the design to maximize the
level of homogeneity between FSS and Metsat systems. It is envisioned
that this would maximize compatibility and facilitate coordination under
No. **9.7** for operation of both types of systems in the space-to-Earth
direction.

In accordance with No. **5.516** the band 18.0-18.1 GHz in the
Earth-to-space direction is used for feeder links for the
broadcasting-satellite service. Compatibility studies have been
performed to estimate the typical required separation distances in
reverse band sharing situations between receiving MetSat earth stations
and transmitting BSS feeder uplink stations. In the worst case, it has
been determined that around 40 km separation is required. Therefore it
is expected that with some care in situating the limited number of
MetSat receive stations international coordination would rarely be
required under No. **9.17A**.

While the expected design of the GSO MetSat satellite networks
envisioned for operation in the 300 MHz wide band appears to be
generally compatible with FSS systems being implemented, it would appear
that, for Region 2, operating MetSat systems below 18.3 GHz would avoid
several potential difficulties. Given the desire to have a common MetSat
allocation in all three Regions, it is proposed to expand the additional
allocation in No. **5.519** from 18.1-18.3 GHz to 18.0-18.3 GHz,
including the limitation to geostationary satellites and the requirement
to meet the provisions of Article **21**, Table 21-4.

In addition, ITU-R studies have shown that, in conjunction with
extending the MetSat allocation, extending the existing FSS coordination
arc principle in this band to the case of MetSat systems coordinating
with FSS networks has the potential to reduce the workload of the Bureau
in identifying affected administrations and fulfils the purposes
envisioned by Resolution **901 (WRC-03)**. As such, a consequential
modification to Table 5-1 of Appendix **5** to include this change is
also proposed. It is noted that as with the current No. **9.7**, an
administration may request, pursuant to No. **9.41**, to be included in
requests for coordination involving the MetSat or FSS service in this
band, indicating the networks for which the value of *T*/*T* calculated
by the method in § 2.2.1.2 and 3.2 of Appendix **8** exceeds 6%.

**Proposal:**

# USA/ /1 MOD

**5.519** *Additional allocation:  *the band
18.[0]{.underline}~~1~~-18.3 GHz is also allocated to the
meteorological-satellite service (space-to-Earth) on a primary basis.
Its use is limited to geostationary satellites and shall be in
accordance with the provisions of Article **21**, Table **21-4**.

**Reasons**: Expanding the current 18.1-18.3 GHz geostationary
meteorological-satellite service (space-to-Earth) allocation to the band
18.0-18.1 GHz by modifying No. **5.519** will provide greater
flexibility for the meteorological-satellite service and extend the
current criteria (i.e., the limitation to geostationary satellites and
the requirement to meet the provisions of Article **21**, Table 21-4) to
protect existing services.

# USA/ /2 ADD

**5.519\[A\]** In the band 18.0-18.1 GHz, earth stations of the
meteorological satellite service (space-to-Earth) in Region 1 and 3
shall not claim protection from the broadcasting-satellite service
feeder-link earth stations operating under Appendix 30A, nor put any
limitations or restrictions on the locations of the
broadcasting-satellite service feeder-link earth stations anywhere
within the service area of the feeder link.

**Reasons:** Analysis has shown that under worst case assumptions a
maximum separation distance of 40 km would be required between a Metsat
receiving station and a BSS feeder-link transmitting station in order to
protect the Metsat receiving station. This minimal separation distance
should ensure that both Metsat receive stations and BSS feederlinks can
effectively use this band. Nevertheless, this provision would ensure
that Metsat receive stations could not affect the APP 30 A Plan.

**USA/ /3 MOD**

15.4-18.4 GHz

+-----------------------+-----------------------+-----------------------+
| Allocation to         |                       |                       |
| services              |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Region 1              | Region 2              | Region 3              |
+-----------------------+-----------------------+-----------------------+
| **15.4-15.43**        |                       |                       |
| AERONAUTICAL          |                       |                       |
| RADIONAVIGATION       |                       |                       |
|                       |                       |                       |
| 5.511D                |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **15.43-15.63**       |                       |                       |
| FIXED-SATELLITE       |                       |                       |
| (Earth-to-space)      |                       |                       |
| 5.511A                |                       |                       |
|                       |                       |                       |
| AERONAUTICAL          |                       |                       |
| RADIONAVIGATION       |                       |                       |
|                       |                       |                       |
| 5.511C                |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **15.63-15.7**        |                       |                       |
| AERONAUTICAL          |                       |                       |
| RADIONAVIGATION       |                       |                       |
|                       |                       |                       |
| 5.511D                |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **15.7-16.6**         |                       |                       |
| RADIOLOCATION         |                       |                       |
|                       |                       |                       |
| 5.512 5.513           |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **16.6-17.1**         |                       |                       |
| RADIOLOCATION         |                       |                       |
|                       |                       |                       |
| Space research (deep  |                       |                       |
| space)                |                       |                       |
| (Earth-to-space)      |                       |                       |
|                       |                       |                       |
| 5.512 5.513           |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **17.1-17.2**         |                       |                       |
| RADIOLOCATION         |                       |                       |
|                       |                       |                       |
| 5.512 5.513           |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **17.2-17.3** EARTH   |                       |                       |
| EXPLORATION-SATELLITE |                       |                       |
| (active)              |                       |                       |
|                       |                       |                       |
| RADIOLOCATION         |                       |                       |
|                       |                       |                       |
| SPACE RESEARCH        |                       |                       |
| (active)              |                       |                       |
|                       |                       |                       |
| 5.512 5.513 5.513A    |                       |                       |
+-----------------------+-----------------------+-----------------------+
| **17.3-17.7**         | **17.3-17.7**         | **17.3-17.7**         |
|                       |                       |                       |
| FIXED-SATELLITE\      | FIXED-SATELLITE\      | FIXED-SATELLITE\      |
| (Earth-to-space)      | (Earth-to-space)      | (Earth-to-space)      |
| 5.516\                | 5.516                 | 5.516                 |
| (space-to-Earth)      |                       |                       |
| 5.516A 5.516B         | B                     | Radiolocation         |
|                       | ROADCASTING-SATELLITE |                       |
| Radiolocation         |                       |                       |
|                       | Radiolocation         |                       |
+-----------------------+-----------------------+-----------------------+
| 5.514                 | 5.514 5.515 5.517     | 5.514                 |
+-----------------------+-----------------------+-----------------------+
| **17.7-18.1**         | **17.7-17.8**         | **17.7-18.1**         |
|                       |                       |                       |
| FIXED                 | FIXED                 | FIXED                 |
|                       |                       |                       |
| FIXED-SATELLITE\      | FIXED-SATELLITE\      | FIXED-SATELLITE\      |
| (space-to-Earth)      | (space-to-Earth)\     | (space-to-Earth)      |
| 5.484A\               | (Earth-to-space)      | 5.484A\               |
| (Earth-to-space)      | 5.516                 | (Earth-to-space)      |
| 5.516                 |                       | 5.516                 |
|                       | B                     |                       |
| MOBILE                | ROADCASTING-SATELLITE | MOBILE                |
|                       |                       |                       |
| **ADD** 5.519 **ADD** | Mobile 5.518          | **ADD** 5.519 **ADD** |
| 5.519\[A\]            |                       | 5.519\[A\]            |
|                       | 5.515 5.517           |                       |
+-----------------------+-----------------------+-----------------------+
|                       | **17.8-18.1**         |                       |
|                       |                       |                       |
|                       | FIXED                 |                       |
|                       |                       |                       |
|                       | FIXED-SATELLITE\      |                       |
|                       | (space-to-Earth)      |                       |
|                       | 5.484A\               |                       |
|                       | (Earth-to-space)      |                       |
|                       | 5.516                 |                       |
|                       |                       |                       |
|                       | MOBILE                |                       |
|                       |                       |                       |
|                       | **ADD** 5.519         |                       |
+-----------------------+-----------------------+-----------------------+
| **18.1-18.4** FIXED   |                       |                       |
|                       |                       |                       |
| FIXED-SATELLITE       |                       |                       |
| (space-to-Earth)      |                       |                       |
| 5.484A 5.516B\        |                       |                       |
| (Earth-to-space)      |                       |                       |
| 5.520                 |                       |                       |
|                       |                       |                       |
| MOBILE                |                       |                       |
|                       |                       |                       |
| **MOD** 5.519 5.521   |                       |                       |
+-----------------------+-----------------------+-----------------------+

**Reasons:** Consequential to adding the additional 100 MHz in the band
18.0-18-1 GHz to **No. 5.519**. In addition, 5.519\[A\] ensures that
Metsat receive stations cannot affect the App 30A Plan.

# USA/ /3 MOD

TABLE 5-1 (*continued*)     (Rev.WRC‑0~~3~~[7]{.underline})

+----+-----------+-----------+-----------------+--------+-----------+
| Re | Case      | Frequency | Thre            | Calcul | Remarks   |
| fe |           | bands\    | shold/condition | ation\ |           |
| re |           | (and      |                 | method |           |
| nc |           | Region)   |                 |        |           |
| e\ |           | of the    |                 |        |           |
| o  |           | service\  |                 |        |           |
| f\ |           | for which |                 |        |           |
| A  |           | coor      |                 |        |           |
| rt |           | dination\ |                 |        |           |
| ic |           | is sought |                 |        |           |
| le |           |           |                 |        |           |
| 9  |           |           |                 |        |           |
+====+===========+===========+=================+========+===========+
| N  |           | 3\)       | i\) Bandwidth   |        |           |
| o. |           | 17.7‑20.2 | overlap, and    |        |           |
| ** |           | GHz,\     |                 |        |           |
| 9. |           | (Regions  | ii\) any        |        |           |
| 7\ |           | 2 and     | network in the  |        |           |
| ** |           | 3),\      | FSS and any     |        |           |
| GS |           | 17.3-20.2 | associated      |        |           |
| O/ |           | GHz\      | space operation |        |           |
| GS |           | (         | functions (see  |        |           |
| O\ |           | Region 1) | No. **1.23**)   |        |           |
| (  |           | and\      | with a space    |        |           |
| *c |           | 27.5‑30   | station within  |        |           |
| on |           | GHz       | an orbital arc  |        |           |
| t. |           |           | of  8° of the   |        |           |
| *) |           |           | nominal orbital |        |           |
|    |           |           | position of a   |        |           |
|    |           |           | proposed        |        |           |
|    |           |           | network in the  |        |           |
|    |           |           | FSS             |        |           |
+----+-----------+-----------+-----------------+--------+-----------+
|    |           | [4)       | [i) Bandwidth   |        |           |
|    |           | 18.0-18.3 | overlap,        |        |           |
|    |           | GHz]{.u   | a               |        |           |
|    |           | nderline} | nd]{.underline} |        |           |
|    |           |           |                 |        |           |
|    |           |           | [ii) any        |        |           |
|    |           |           | network in the  |        |           |
|    |           |           | FSS or MetSat   |        |           |
|    |           |           | service and any |        |           |
|    |           |           | associated      |        |           |
|    |           |           | space operation |        |           |
|    |           |           | functions (see  |        |           |
|    |           |           | No. **1.23**)   |        |           |
|    |           |           | with a space    |        |           |
|    |           |           | station within  |        |           |
|    |           |           | an orbital arc  |        |           |
|    |           |           | of  8° of the   |        |           |
|    |           |           | nominal orbital |        |           |
|    |           |           | position of a   |        |           |
|    |           |           | proposed        |        |           |
|    |           |           | network in the  |        |           |
|    |           |           | FSS or MetSat   |        |           |
|    |           |           | servi           |        |           |
|    |           |           | ce]{.underline} |        |           |
+----+-----------+-----------+-----------------+--------+-----------+
|    |           | [5]       | i\) Bandwidth   |        |           |
|    |           | {.underli | overlap, and    |        |           |
|    |           | ne}~~4~~) |                 |        |           |
|    |           | Bands     | ii\) any        |        |           |
|    |           | above     | network in the  |        |           |
|    |           | 17.3 GHz, | FSS and any     |        |           |
|    |           | except    | associated      |        |           |
|    |           | those     | space operation |        |           |
|    |           | defined   | functions (see  |        |           |
|    |           | in § 3)   | No. **1.23**)   |        |           |
|    |           | [and      | with a space    |        |           |
|    |           | 4)]{.u    | station within  |        |           |
|    |           | nderline} | an orbital arc  |        |           |
|    |           |           | of 8° of the    |        |           |
|    |           |           | nominal orbital |        |           |
|    |           |           | position of a   |        |           |
|    |           |           | proposed        |        |           |
|    |           |           | network in the  |        |           |
|    |           |           | FSS (see also   |        |           |
|    |           |           | Resolution      |        |           |
|    |           |           | **901           |        |           |
|    |           |           | (WRC‑03)**)     |        |           |
+----+-----------+-----------+-----------------+--------+-----------+
|    |           | [6]       | i\) Bandwidth   |        |           |
|    |           | {.underli | overlap, and    |        |           |
|    |           | ne}~~5~~) |                 |        |           |
|    |           | Bands     | ii\) any        |        |           |
|    |           | above     | network in the  |        |           |
|    |           | 17.3 GHz  | FSS or BSS, not |        |           |
|    |           |           | subject to a    |        |           |
|    |           |           | Plan, and any   |        |           |
|    |           |           | associated      |        |           |
|    |           |           | space operation |        |           |
|    |           |           | functions (see  |        |           |
|    |           |           | No. **1.23**)   |        |           |
|    |           |           | with a space    |        |           |
|    |           |           | station within  |        |           |
|    |           |           | an orbital arc  |        |           |
|    |           |           | of 16° of the   |        |           |
|    |           |           | nominal orbital |        |           |
|    |           |           | position of a   |        |           |
|    |           |           | proposed        |        |           |
|    |           |           | network in the  |        |           |
|    |           |           | FSS or BSS, not |        |           |
|    |           |           | subject to a    |        |           |
|    |           |           | Plan, except in |        |           |
|    |           |           | the case of a   |        |           |
|    |           |           | network in the  |        |           |
|    |           |           | FSS with        |        |           |
|    |           |           | respect to a    |        |           |
|    |           |           | network in the  |        |           |
|    |           |           | FSS (see also   |        |           |
|    |           |           | R               |        |           |
|    |           |           | esolution **901 |        |           |
|    |           |           | (WRC‑03)**)     |        |           |
+----+-----------+-----------+-----------------+--------+-----------+
| N  |           | [7]       | i\) Bandwidth   | Ap     | In        |
| o. |           | {.underli | overlap, and    | pendix | ap        |
| ** |           | ne}~~6~~) |                 | **8**  | plication |
| 9. |           | All       | ii\) Value of   |        | of        |
| 7\ |           | frequency | *T*/*T* exceeds |        | Article   |
| ** |           | bands,    | 6%              |        | 2A of     |
| GS |           | other     |                 |        | Appendix  |
| O/ |           | than      |                 |        | **30**    |
| GS |           | those in  |                 |        | for the   |
| O\ |           | 1), 2),   |                 |        | space     |
| (  |           | 3),       |                 |        | operation |
| *c |           | 4)[,]{.u  |                 |        | functions |
| on |           | nderline} |                 |        | using the |
| t. |           | [5)]{.u   |                 |        | g         |
| *) |           | nderline} |                 |        | uardbands |
|    |           | and       |                 |        | defined   |
|    |           | [6]{      |                 |        | in § 3.9  |
|    |           | .underlin |                 |        | of Annex  |
|    |           | e}~~5~~), |                 |        | 5 of      |
|    |           | allocated |                 |        | Appendi   |
|    |           | to a      |                 |        | x **30**, |
|    |           | space     |                 |        | the       |
|    |           | service,  |                 |        | t         |
|    |           | and the   |                 |        | hreshold/ |
|    |           | bands in  |                 |        | condition |
|    |           | 1), 2),   |                 |        | specified |
|    |           | 3), 4)[,  |                 |        | for the   |
|    |           | 5)]{.u    |                 |        | FSS in    |
|    |           | nderline} |                 |        | the bands |
|    |           | and [6]   |                 |        | in 2)     |
|    |           | {.underli |                 |        | applies.  |
|    |           | ne}~~5~~) |                 |        |           |
|    |           | where the |                 |        | In        |
|    |           | radio     |                 |        | ap        |
|    |           | service   |                 |        | plication |
|    |           | of the    |                 |        | of        |
|    |           | proposed  |                 |        | Article   |
|    |           | network   |                 |        | 2A of     |
|    |           | or        |                 |        | Appendi   |
|    |           | affected  |                 |        | x **30A** |
|    |           | networks  |                 |        | for the   |
|    |           | is other  |                 |        | space     |
|    |           | than the  |                 |        | operation |
|    |           | space     |                 |        | functions |
|    |           | services  |                 |        | using the |
|    |           | listed in |                 |        | g         |
|    |           | the       |                 |        | uardbands |
|    |           | t         |                 |        | defined   |
|    |           | hreshold/ |                 |        | in § 3.1  |
|    |           | condition |                 |        | and 4.1   |
|    |           | column,   |                 |        | of Annex  |
|    |           | or in the |                 |        | 3 of      |
|    |           | case of   |                 |        | Appendix  |
|    |           | coo       |                 |        |  **30A**, |
|    |           | rdination |                 |        | the       |
|    |           | of space  |                 |        | t         |
|    |           | stations  |                 |        | hreshold/ |
|    |           | operating |                 |        | condition |
|    |           | in the    |                 |        | specified |
|    |           | opposite  |                 |        | for the   |
|    |           | direction |                 |        | FSS in    |
|    |           | of        |                 |        | the bands |
|    |           | tra       |                 |        | in 4)     |
|    |           | nsmission |                 |        | applies   |
+----+-----------+-----------+-----------------+--------+-----------+

**Reasons:** Consequential modification to the additional allocation to
MetSat in the band 18.0-18.1 GHz. ITU studies have shown that extending
the ±8º coordination arc, currently applicable to FSS networks in this
band, to the meteorological-satellite (MetSat) services in this band
would reduce the workload of the Bureau in identifying affected
administrations and the number of unnecessary coordinations for such
systems while maintaining the rights of administrations to be included
in requests for coordination involving the MetSat or FSS service in this
band.

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

[^1]: This is a replacement for the earlier U.S. proposal for this
    agenda item.