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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 8 to Document 5-E**

                                                   **7 September 2007**

                                                   **Original: English**

  United States of America                         

  proposals for the work of the conference         

  Agenda item 7.2                                  
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7.2 to recommend to the Council items for inclusion in the agenda for
the next WRC, and to give its views on the preliminary agenda for the
subsequent conference and on possible agenda items for future
conferences, taking into account Resolution **803** **(WRC‑03)**

Introduction

In the preliminary agenda for the next WRC, agenda item 2.2 states: "to
consider frequency allocations between 275 GHz and 3 000 GHz taking into
account the result of ITU-R studies in accordance with Resolution **950
(WRC-03)**;"

Studies in ITU-R, most notably WP 1A, WP 3J, WP 3M, WP 4A, WP 7B, WP 7C,
WP 7D, WP 8A, WP 9B, have very clearly identified the interest within
the active and passive services in using frequencies in the spectral
region above 275 GHz. Resolution 950 (WRC-03) has allowed for the
submission of details on systems operating in this range into the Master
International Frequency Register (MIFR). However, there is no registered
use to date by any of the active services. On the other hand, the radio
astronomy, Earth exploration-satellite (passive) and the space research
(passive) services all make extensive use of this spectral region.
Within the radio astronomy service, several administrations have already
made significant infrastructure investments in radio astronomy sites
around the world. This extensive use of this spectral region by the
passive services along with the lack of use of the same by the various
active services indicates that the general consideration of frequency
allocations between 275 and 3 000 GHz is premature and such
consideration would likely take up a great deal of resources in
preparing for the 2011 Conference. As an alternative, reviewing and
revising No. 5.565 would be desirable while at the same time require far
less preparation by administrations for the 2011 Conference.

The United States proposes the suppression and replacement of a future
WRC agenda item to be considered at WRC-11 on allocations above 275 GHz,
as shown in the attachment.

**Attachment**: 1

ATTACHMENT

Proposal for the suppression and replacement of a future WRC agenda
item\
to be considered at WRC-11 on allocations above 275 GHz

*Subject:* Suppression and replacement of a future WRC agenda item for
WRC-11 on allocations above 275 GHz

***Origin**:* United States

***Proposal:*** to review and revise No. **5.565** with a view to
updating the list of frequencies for passive services in the spectral
region from 275-3 000 GHz, taking into account the results of ITU‑R
studies in accordance with Resolution 950.

***Background/reason:  ***The extensive use of this spectral region by
the passive services along with the lack of use of the same by the
various active services indicates that the general consideration of
frequency allocations between 275 and 3 000 GHz is premature and such
consideration would likely take up a great deal of resources in
preparing for the 2011 Conference. As an alternative, reviewing and
revising No. **5.565** would be desirable while at the same time require
far less preparation by administrations for the 2011 Conference.

***Radiocommunication services concerned:  ***Earth
exploration-satellite (passive), space research (passive), radio
astronomy

***Indication of possible difficulties:***  None foreseen

***Previous/ongoing studies on the issue:  ***Both WP 7C and WP 7D have
studied the requirements for the passive services above 275 GHz and
continue to do so.

***ITU-R Study Groups concerned:*** SG 7

***ITU resource implications, including financial implications (refer to
CV126):*** Minimal

***Common regional proposal:*** No ***Multicountry proposal:*** No

***Number of countries:***

***Remarks:*** This agenda item would require far less resources to
complete than the existing agenda item pertaining to allocations above
275 GHz and is more realistic at this time.

**MOD** USA/5A8/1

RESOLUTION 803 (WRC‑07)

Agenda for the 2011 World\
Radiocommunication Conference

The World Radiocommunication Conference (Geneva, 2007),

\...

**SUP** USA/5A8/2

2.2 to consider frequency allocations between 275 GHz and 3 000 GHz
taking into account the result of ITU-R studies in accordance with
Resolution **950** **(WRC‑03)**;

**ADD** USA/5A8/3

**2.X** to review and revise No. **5.565** with a view to updating the
list of frequencies for passive services in the spectral region from
275-3 000 GHz, taking into account the results of ITU‑R studies in
accordance with Resolution **950** **(WRC‑03)**;

...

**Reasons:** The extensive use of this spectral region by the passive
services along with the lack of use of the same by the various active
services indicates that the general consideration of frequency
allocations between 275 and 3 000 GHz is premature and such
consideration would likely take up a great deal of resources in
preparing for the 2011 Conference. As an alternative, reviewing and
revising No. 5.565 would be desirable while at the same time require far
less preparation by administrations for the 2011 Conference.

**MOD** USA/5A8/4

RESOLUTION 950 (Rev.WRC-07)

Consideration of the use of the frequencies\
between 275 and 3 000 GHz

The World Radiocommunication Conference (Geneva, 2007),

considering

*a)* that, in the Table of Frequency Allocations, frequency bands above
275 GHz are not allocated;

*b)* that, notwithstanding *considering a)*, No. **5.565** makes
provision for the use of the frequency band 275-1 000 GHz for
experimentation with, and development of various passive services and
all other services and recognizes the need to conduct further research;

*c)* that No. **5.565** also makes provision for the protection of
passive services until, and if, such time as the Table of Frequency
Allocations may be extended;

*d)* that, in addition to the spectral lines identified by
No. **5.565**, research activities in the bands above 275 GHz may yield
other spectral lines of interest, such as those listed in Recommendation
ITU‑R RA.314;

*e)* that within various Radiocommunication Study Groups, studies on
systems between 275 and 3 000 GHz, including system characteristics of
suitable applications, are being considered;

*f)* that the present use of the bands between 275 and 3 000 GHz is
mainly related to the passive services, however, with anticipated
technology development, the bands may become increasingly important for
suitable active service applications;

*g)* that sharing studies in ITU‑R among passive services and all other
services operating in frequencies between 275 and 3 000 GHz have not
been completed,

recognizing

*a)* that propagation characteristics at frequencies above 275 GHz, such
as atmospheric absorption and scattering, have a significant impact on
the performance of both active and passive systems and need to be
studied;

*b)* that it is necessary to investigate further the potential uses of
the bands between 275 and 3 000 GHz by suitable applications,

noting

*a)* that significant infrastructure investments are being made under
international collaboration for the use of these bands between 275 and
3 000 GHz, for example, the Atacama Large Millimetre Array (ALMA), a
facility under construction that will provide new insights on the
structure of the universe;

*b)* that Radiocommunication Bureau Circular Letter CR/137 identified
additional information for the Bureau to record characteristics of
active and passive sensors for Earth exploration-satellite service and
space research service satellites, in frequency bands below 275 GHz,

further noting

*a)* that a process and format similar to that provided in *noting b)*
could be used to record systems operating in the 275 to 3 000 GHz band;

*b)* that recording active and passive systems operating in the 275 to
3 000 GHz band will provide information until the date when, and if, it
is determined that changes to the Radio Regulations are needed,

resolves

that administrations may submit for inclusion in the Master
International Frequency Register details on systems which operate
between 275 and 3 000 GHz and which may be recorded by the
Radiocommunication Bureau under Nos. **8.4**, **11.8** and **11.12**,

invites ITU‑R

to conduct the necessary studies in time for consideration by WRC‑11
with a view to the modification of No. **5.565**,

instructs the Director of the Radiocommunication Bureau

to accept submissions referred to in *resolves*, and to record them in
the Master International Frequency Register.

**Reasons:** Changes proposed are consequential to bring Resolution 950
in line with the new agenda item.

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