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

                                                   

                                                   

  **COMMITTEE 4**                                  **Addendum 17 to\
                                                   Document 5-E**

                                                   **30 October 2007**

                                                   **Original: English**

  United States of America                         

  proposal for the work of the conference          

  Agenda item 1.4                                  
  ------------------------------------------------ ----------------------------------------------------

1.4 to consider frequency-related matters for the future development of
IMT‑2000 and systems beyond IMT‑2000 taking into account the results of
ITU‑R studies in accordance with Resolution **228 (Rev.WRC‑03)**

Background information

Resolution 228 (Rev.WRC-03) calls for studies on frequency-related
matters for the "future development of IMT-2000" (now referred to as
"IMT-2000") and "systems beyond IMT-2000" (now named "IMT-Advanced") as
defined by ITU-R. *resolves* 2 under Resolution 228 (Rev.WRC‑03) invites
ITU-R to report, in time for WRC-07, on the results of studies on the
spectrum requirements and potential frequency ranges suitable for
IMT-2000 and IMT-Advanced, taking into account:

-- the evolving user needs, including the growth in demand for IMT-2000
services;

-- the evolution of IMT-2000 and pre-IMT-2000 systems through advances
in technology;

-- the bands currently identified for IMT-2000;

-- the time-frame in which spectrum would be needed;

-- the period for migration from existing to future systems;

-- the extensive use of frequencies below those identified for IMT-2000
in RR No. **5.317A**.

WARC-92 identified the bands 1 885-2 025 MHz/2 110-2 200 MHz and
WRC-2000 identified the bands 806-960 MHz (ITU-R Region 1: 862-960
MHz)/1 710-1 885 MHz/2 500-2 690 MHz for use on a worldwide basis by
administrations wishing to implement IMT-2000 systems. Resolutions 212
(Rev.WRC‑97), 223 (WRC-2000) and 224 (WRC-2000) invite administrations
to make available the necessary portion of these identified bands for
IMT-2000 development, while recognizing that administrations have the
flexibility to use the bands for other applications of services to which
the bands are allocated and to implement IMT-2000 in other mobile bands.

As part of the process to identify candidate bands to meet the potential
spectrum requirements for IMT-2000 and IMT-Advanced (collectively
referred to as "IMT"), Resolution 228 (Rev.WRC‑03) calls for technical
studies on the compatibility with existing services in the bands of
interest. However, at this time such studies have not been completed in
all candidate bands.

The candidate bands for IMT-2000 and IMT-Advanced systems contained in
Report ITU-R M.2079 are between 400 MHz and 5 GHz and in numerical order
are:

-- 410-430 MHz

-- 450-470 MHz

-- 470-960 MHz

-- 1 710-2 025 MHz and 2 110-2 200 MHz

-- 2 300-2 400 MHz

-- 2 500-2 690 MHz

-- 2 700-2 900 MHz

-- 3 400-4 200 MHz

-- 4 400-4 990 MHz.

This proposal addresses one of candidate bands 3 400-4 200 MHz.

3 400-4 200 MHz

The 3 400-3 600 MHz band is allocated to the radiolocation service on a
primary basis in ITU‑R Regions 2 and 3. The band 3 400-3 600 MHz is
allocated to the radiolocation service on a secondary basis in ITU-R
Region 1 and the band 3 600-3 700 MHz band is allocated to the
radiolocation service on a secondary basis in ITU-R Regions 2 and 3. In
this frequency range, administrations have developed and deployed a
variety of mobile and transportable high power radar systems that
operate on land, on ships, and on aircraft. The shipborne radars are
principally used in coastal areas, but can also be used during open
ocean transit. The airborne radars are highly mobile and operate in many
areas of the world. A number of ongoing sharing studies submitted to the
ITU-R have indicated that sharing in the 3 400-3 700 MHz band between
the radiolocation service and IMT-Advanced systems operating in the
mobile service is not feasible in the same geographic area due to
significant levels of interference into both the radar systems and
IMT‑Advanced devices.

Sharing studies have been conducted within ITU-R regarding sharing of
IMT-2000 and IMT‑Advanced with FSS receive earth stations. To provide
protection to the FSS receive earth stations, some physical separation
to the stations of the mobile terrestrial network is required. The
magnitude of this separation distance depends on the parameters of the
networks and the deployment of the two services, including the elevation
angle of the earth station, the position of the IMT-Advanced terminal
and/or base station relative to the FSS earth station and the amount of
clutter loss. While the studies are still ongoing, the current range of
separation distances associated with a single IMT-Advanced macro base
station is from 36 to 70 km for the non-site specific studies (flat
terrain model) if only long-term interference is considered, and from
34-430 km if short-term effects are also considered. It should be noted
that the 34 km distance for short-term interference does not include the
effects of ducting. If ducting effects are taken into account, the
separation distance associated with short-term interference ranges from
140-430 km. For site specific studies, where actual terrain profiles
were taken into account, the current range of separation distances
associated with a single IMT-Advanced macro base station is 1 to 110 km
if only long-term interference is considered and 270 km to 280 km if
short-term effects are also considered. It is noted that the 270-280 km
distance corresponds to the results of a single (and only) site specific
sharing study by Working Party 8F that considered the effects of
short-term interference. It should also be noted that mitigation
techniques are also under study that may reduce the separation
distances. The minimum separation distances related to the IMT-Advanced
micro and/or mobile station will generally be smaller than the ranges
listed above.

Although the studies have differences in assumptions and methodologies
and need to be continued to find convergence, they all show that
ubiquitously deployed IMT-Advanced systems cannot share in the same
geographical area with FSS, when the FSS is deployed in a ubiquitous
manner and/or with no individual licensing of earth stations, since no
minimum separation can be guaranteed.

In view of the results of the available sharing studies to date and the
above considerations, the band 3 700-4 200 MHz should be removed from
consideration as a candidate band for IMT-Advanced systems.

ARTICLE 5

Frequency allocations

Section IV -- Table of Frequency Allocations\
(See No. 2.1)

**[NOC]{.underline}** USA/5A17/1

2 700-4 800 MHz

+----------------------+----------------------+-----------------------+
| > Allocation to      |                      |                       |
| > services           |                      |                       |
+----------------------+----------------------+-----------------------+
| > Region 1           | > Region 2           | > Region 3            |
+----------------------+----------------------+-----------------------+
| > **3 400-3 600**    | > **3 400-3 500**    |                       |
| >                    | >                    |                       |
| > FIXED              | > FIXED              |                       |
| >                    | >                    |                       |
| > FIXED-SATELLITE\   | > FIXED-SATELLITE    |                       |
| > (space-to-Earth)   | > (space-to-Earth)   |                       |
| >                    | >                    |                       |
| > Mobile             | > Amateur            |                       |
| >                    | >                    |                       |
| > Radiolocation      | > Mobile             |                       |
| >                    | >                    |                       |
| > 5.431              | > Radiolocation      |                       |
| >                    | > 5.433              |                       |
| > **3 600-4 200**    | >                    |                       |
| >                    | > 5.282 5.432        |                       |
| > FIXED              | >                    |                       |
| >                    | > **3 500-3 700**    |                       |
| > FIXED-SATELLITE\   | >                    |                       |
| > (space-to-Earth)   | > FIXED              |                       |
| >                    | >                    |                       |
| > Mobile             | > FIXED-SATELLITE    |                       |
|                      | > (space-to-Earth)   |                       |
|                      | >                    |                       |
|                      | > MOBILE except      |                       |
|                      | > aeronautical       |                       |
|                      | > mobile             |                       |
|                      | >                    |                       |
|                      | > Radiolocation      |                       |
|                      | > 5.433              |                       |
|                      | >                    |                       |
|                      | > 5.435              |                       |
|                      | >                    |                       |
|                      | > **3 700-4 200**    |                       |
|                      | >                    |                       |
|                      | > FIXED              |                       |
|                      | >                    |                       |
|                      | > FIXED-SATELLITE    |                       |
|                      | > (space-to-Earth)   |                       |
|                      | >                    |                       |
|                      | > MOBILE except      |                       |
|                      | > aeronautical       |                       |
|                      | > mobile             |                       |
+----------------------+----------------------+-----------------------+

**Reasons:** The United States proposes no change to 3 400-4 200 MHz for
the following reasons. ITU-R studies have not shown compatibility
between IMT systems and the radiolocation service in the 3 400-3 700 MHz
band. The results of the ITU-R sharing studies in the 3 400-4 200 MHz
band have shown that sharing between IMT-Advanced systems and the
fixed-satellite service is not feasible within the same geographic area.

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