***RCS WRC --07 Agenda Item Scope and High-Level Work Plan***[^1]

**Agenda Item 1.20:** to consider the results of studies, and proposals
for regulatory measures, if appropriate, regarding the protection of the
Earth exploration-satellite service (passive) from unwanted emissions of
active services in accordance with Resolution **738 (WRC--03)**.

**Short Description:** Resolution **738 (WRC--03)** calls for studies of
compatibility between the Earth exploration-satellite (passive) service
and unwanted emissions from particular active services in nine specified
pairs of active and passive service frequency bands. It also resolves to
recommend that WRC--07 review the studies and consider regulatory
measures, if appropriate, to protect the passive service, considering
the impact on the concerned services.

**Background:** Under part of Agenda Item 1.8.2, WRC--03 considered
compatibility between unwanted emissions and the EESS (passive) in
combinations of active and passive service bands. Proposals from APT and
CEPT favored hard limits on active service unwanted emissions to provide
the needed protection. These proposals were based primarily, but not
exclusively, on Task Group 1/7 studies that had been documented in
Recommendation ITU--R SM.1633. The United States, however, proposed that
no changes be made to the *Radio Regulations*.

With nearly all administrations supporting continuation of studies at a
minimum---the United States and a few others opposed this---the
Conference approved Resolution **738** along with inclusion of the EESS
(passive) protection issue in the agenda for WRC--07.

At the fourteenth plenary meeting of WRC--03, the delegate of the United
States made the following statement regarding Agenda Item 1.20 of the
proposed agenda for WRC--07 (§ 17.13 of Document 410):

> *The United States continues to believe that the only regulatory
> measures that could possibly result from the studies under WRC‑07
> agenda item 1.20 and its associated Resolution \[738\] are hard limits
> for terrestrial radio services. The imposition of such regulatory
> limits on communications equipment including aircraft communications,
> defence radars, and cellular handsets, among others, would represent a
> significant burden on equipment manufacturers and national regulators.
> Because of this, we believe that this agenda item will be extremely
> difficult to resolve at WRC‑07.*

CPM06--1 designated a task group of Study Group 1 as the responsible
group for Agenda Item 1.20. At its November 2003 meeting, Study Group 1
established Task Group 1/9 to conduct studies and draft CPM text for
this agenda item. The first CPM also designated Working Party 7C as the
contributing group, and Study Group 6, along with Working Parties 4A,
8D, 9B and 9D as the interested groups.

**Scope of Agenda Item:** Whereas WRC--03 Agenda Item 1.8.2 was not
specific regarding the bands to be studied, Resolution **738 (WRC--03)**
for WRC--07 applies to six EESS (passive) bands and nine adjacent or
nearby active service bands. For two combinations of active and passive
service bands near 30 and 50 GHz, Resolution **738** limits studies to
consideration of the impact of recommended fixed service unwanted
emission limits (those resulting from studies documented in
Recommendation ITU--R SM.1633) in Regions 2 and 3.

Resolution **745 (WRC--03)**, to be addressed under WRC--07 Agenda
Item 1.17, calls for studies of a number of compatibility issues near
1.4 GHz. Apparently included in these studies are the effect of fixed
service unwanted emissions on EESS (passive) operation in the
1400--1427 MHz band.

**Key technical/regulatory issues to be resolved:**

-   Continuation of studies in Recommendation ITU--R SM.1633 to consider
    the probability of interference

-   Impact of the increased sensitivity of remote sensing systems
    reflected in the May 2003 revision of Recommendation ITU--R SA.1029

-   Applicability of No. **5.340.1** of the *Radio Regulations*

-   Overlap of studies in support of WRC--07 Agenda Items 1.17 and 1.20

**Key policy issues to be resolved:**

-   U.S. policy regarding methods to address Agenda Item 1.20

-   Possibility of a solution not involving "hard limits"

-   Effect of the U.S. statement at WRC--03 on the resolution of this
    agenda item

**Work Plan:**

1.  Engage the FCC in discussions to explore suitable solutions to this
    agenda item from a private sector perspective

2.  Develop an initial RCS position on the agenda item considering views
    of all affected Federal Agencies

3.  Contribute to and participate in Task Group 1/9 studies on the
    compatibility between EESS (passive) and unwanted emissions from
    active services

4.  Develop a proposal that would avoid unacceptable "hard limits" on
    the active services, but would offer a remedy to the EESS (passive)
    that the United States and other administrations could support

5.  Obtain support of CITEL and other administrations on the U.S.
    proposal

**Reference Material:**

-   Resolution **738 (WRC--03)**

-   Recommendations ITU--R SM.1633 and SA.1029

attachment

RESOLUTION 738 (WRC‑03)

Compatibility analyses between the Earth exploration-satellite\
service (passive) and active services

The World Radiocommunication Conference (Geneva, 2003),

considering

*a)* that primary allocations have been made to various space services
in the Earth-to-space direction such as the fixed-satellite service
(FSS), mobile-satellite service and broadcasting-satellite service
and/or to terrestrial services such as the fixed service, mobile service
and broadcasting service, hereafter referred to as "active services", in
bands adjacent or nearby to bands allocated to the Earth
exploration-satellite service (passive) (EESS);

*b)* that unwanted emissions from active services may cause unacceptable
interference to the EESS (passive);

*c)* that for technical or operational reasons, the general limits in
Appendix **3** may be insufficient in protecting the EESS (passive) in
specific bands;

*d)* that, in many cases, the frequencies used by the EESS (passive)
sensors are chosen to study natural phenomena producing radio emissions
at frequencies fixed by the laws of nature, and therefore shifting
frequency to avoid or mitigate interference problems may not be
possible;

*e)* that Recommendation ITU‑R SM.1633 provides a list of band-pairs and
a methodology for conducting, and a framework for documenting the
results of, the compatibility studies between active and passive
services operating in adjacent and nearby bands;

*f)* that according to Recommendation ITU‑R SM.1633, the EESS (passive)
in the band 31.3-31.5 GHz can be protected if the unwanted emissions of
fixed-service systems (except high-altitude platform stations (HAPS))
operating in the band 31.0-31.3 GHz do not exceed --38 dBW in a 100 MHz
reference bandwidth in the band 31.3-31.5 GHz;

*g)* that according to Recommendation ITU‑R SM.1633, the EESS (passive)
in the band 52.6-54.25 GHz can be protected if the unwanted emissions of
fixed-service systems operating in the band 51.4-52.6 GHz do not exceed
--33 dBW in a 100 MHz reference bandwidth in the band 52.6-54.25 GHz;

*h)* that it is necessary to ensure an equitable burden sharing for
achieving compatibility between active and passive services,

recognizing

*a)* that Recommendation ITU‑R SM.1633 addresses the compatibility
between the EESS (passive) and active services operating in adjacent or
nearby bands;

*b)* that the relevant annexes in Recommendation ITU‑R SM.1633 need
further refinement;

*c)* that Recommendation ITU‑R SM.1633 does not address all band-pairs
in the Table below where compatibility analyses need to be conducted;

*d)* that additional measures may be required to protect the EESS
(passive) from unwanted emissions of active services for the band-pairs
listed in the Table,

resolves

1 to invite ITU‑R to continue or to initiate studies on the
compatibility analyses between EESS (passive) and the corresponding
active services as listed in the Table with a view to updating
Recommendation ITU‑R SM.1633 or developing additional Recommendations;

Table

  ----------------------- ----------------------- -----------------------
  EESS (passive) band     Active service band     Active service

  1 400-1 427 MHz         1 350-1 400 MHz         Fixed service (FS)\
                                                  Mobile service (MS)\
                                                  Radiolocation service

  1 400-1 427 MHz         1 427-1 429 MHz         FS, MS (except
                                                  aeronautical mobile
                                                  service) and space
                                                  research service
                                                  (Earth-to-space)

  1 400-1 427 MHz         1 429-1 452 MHz         FS and MS

  23.6-24 GHz             22.55-23.55 GHz         Inter-satellite service

  31.3-31.5 GHz           30-31 GHz               FSS (Earth-to-space)

  50.2-50.4 GHz^1^        50.4-51.4 GHz^1^        FSS (Earth-to-space)^1^

  50.2-50.4 GHz^1^        47.2-50.2 GHz (Regions  FSS^1^
                          2 and 3)\               
                          49.44-50.2 GHz^1^       
                          (Region 1)              

  ^1^ Studies in this                             
  band must take into                             
  account No. **5.340.1**                         
  of the Radio                                    
  Regulations.                                    
  ----------------------- ----------------------- -----------------------

2 to invite ITU‑R to further study the impact of implementing the values
provided in *considering f)* and *g)* for unwanted emissions of
fixed-service systems operating in Regions 2 and 3, taking into account
that the impact on fixed-service systems in Region 1 has already been
investigated;

3 to recommend that WRC‑07 review the results of the studies identified
in *resolves *1 and 2 in order to consider regulatory measures, if
appropriate, to ensure the protection of the EESS (passive) operating in
the bands listed in the Table from unwanted emissions of active services
operating in the corresponding bands while taking into account the
impact on all concerned services of implementing or not implementing
such measures,

invites administrations

1 to provide the relevant characteristics of active and passive service
systems operating in the bands identified in the Table;

2 to actively participate in the studies identified in *resolves* 1
and* *2.

[^1]: **Author**: Rob Haines **Document Date**: November 26, 2003 (Rev1)