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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 41-E**

                                                   **22 August 2007**

                                                   **Original: English**

  Asia-Pacific Telecommunity Administrations       

  common proposals for the work of the conference  

  Agenda item 1.8                                  
  ------------------------------------------------ ----------------------------------------------------

1.8 to consider the results of ITU-R studies on technical sharing and
regulatory provisions for the application of high altitude platform
stations operating in the bands 27.5-28.35 GHz and 31‑31.3 GHz in
response to Resolution **145** **(WRC‑03),** and for high altitude
platform stations operating in the bands 47.2-47.5 GHz and 47.9-48.2 GHz
in response to Resolution **122 (Rev.WRC‑03)**

Introduction

The major issues stated in the CPM Report concerning WRC-07 Agenda item
1.8 dealing with HAPS in the fixed service (FS) are as follows:

-- Under Resolution 145 (WRC-03), for the identification of an
appropriate 300 MHz segment in the band 27.5-28.35 GHz for use by HAPS
in the countries listed in Nos. 5.537A and 5.543A or countries in Region
2 planning provisional operation, 27.5-27.8 GHz and 28.05-28.35 GHz are
presented as candidate bands with square brackets. In order to reflect
the identified common 300 MHz segment on the current Radio Regulations
and WRC Resolution, examples of modifications to No. 5.537A and
Resolution 145 (WRC-03) are provided. It is recognized that for the
examination of compliance with conditions of HAPS operation, frequency
assignment(s) shall be notified by submitting all mandatory data
elements to the BR.

-- Under Resolution 122 (Rev.WRC-03), two methods to satisfy issues
under the Resolution are presented. One method is suppression of
Resolution 122 (Rev.WRC-03) to be replaced by a new Resolution and
consequential changes to relevant provisions in the Radio Regulations
all of which would reflect study results. Examples of the revision to
No. 5.552A and new Resolution are provided. The other is maintaining
Resolution 122 (Rev.WRC-03) with certain revisions which would reflect
recent study results. Instead of providing an example of the revision,
some requirements of the revisions are provided, i.e. obligations for
power density reduction of a HAPS ground station to avoid interference
to space receivers of FSS, the conditions for avoidance of unwanted
emissions to the RAS in adjacent band and technical/regulatory
requirements for protection of FS in neighbouring countries.

Taking into account the major issues stated above, this document
provides APT Common Proposals for the work of WRC-07 concerning Agenda
item 1.8.

Issues under Resolution 145 (WRC-03)

Introduction

It is proposed to modify Nos. 5.537A, 5.543A and Resolution 145 (WRC-03)
as follows.

ARTICLE 5

Frequency allocations

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

**MOD** ASP/41A8/67

**5.537A** In Bhutan, Korea (Rep. of), the Russian Federation,
Indonesia, Japan, Kazakhstan, Lesotho, Malaysia, Maldives, Mongolia,
Myanmar, Uzbekistan, Pakistan, the Philippines, Kyrgyzstan, the Dem.
People's Rep. of Korea, Sri Lanka, Thailand and Viet Nam, the allocation
to the fixed service in the band 28.05-28.35 GHz may also be used by
high altitude platform stations (HAPS). In India and Iran (Islamic
Republic of), the allocation to the fixed service in the band
27.5-27.8 GHz may also be used by HAPS. Such use of 300 MHz of the
fixed-service allocation by HAPS in the above countries is further
limited to operation in the HAPS-to-ground direction within their
territory and shall not cause harmful interference to other types of
fixed-service systems or other co-primary services. Furthermore, the
development of these other services shall not be constrained by HAPS.
See Resolution **145 (Rev.WRC‑07)**.     (WRC-03)

**Reasons:** India wants to include its country name in this footnote.

For the identification of an appropriate 300 MHz segment in the band
27.5-28.35 GHz for use by HAPS in the countries listed in Nos. 5.537A
and 5.543A, most APT members have a view that it is appropriate to
choose 28.05-28.35 GHz as the common 300 MHz segment considering that,
in the lower part of the band 27.5-28.35 GHz, there are a number of
other existing/planned systems in the primary services, as well as the
identified frequency band (i.e. 27.5-27.82 GHz) for use by high-density
applications in the fixed-satellite service (HDFSS) in Region 1. Some
other APT members have a view that it is appropriate to choose 27.5-27.8
GHz as the common 300 MHz segment.

This footnote would also need to be modified to update the reference to
Resolution 145 which would be revised at WRC-07. In addition, because
the service which is subject to not causing harmful interference cannot
claim protection from harmful interference caused by the other service
or other station in the same service in accordance with No. 5.43 of the
Radio Regulations, the phrase "nor claim protection from" is not
necessary in this footnote.

**MOD** ASP/41A8/68

**5.543A** In Bhutan, Korea (Rep. of), the Russian Federation, India,
Indonesia, Iran (Islamic Republic of), Japan, Kazakhstan, Lesotho,
Malaysia, Maldives, Mongolia, Myanmar, Uzbekistan, Pakistan, the
Philippines, Kyrgyzstan, the Dem. People's Rep. of Korea, Sri Lanka,
Thailand and Viet Nam, the allocation to the fixed service in the
band 31-31.3 GHz may also be used by systems

using high altitude platform stations (HAPS) in the ground-to-HAPS
direction. The use of the band 31-31.3 GHz by systems using HAPS is
limited to the territory of the countries listed above and shall not
cause harmful interference to other types of fixed-service systems,
systems in the mobile service and systems operated under No. **5.545**.
Furthermore, the development of these services shall not be constrained
by HAPS. Systems using HAPS in the band 31-31.3 GHz shall not cause
harmful interference to the radio astronomy service having a primary
allocation in the band 31.3-31.8 GHz, taking into account the protection
criterion as given in Recommendation ITU‑R RA.769. In order to ensure
the protection of satellite passive services, the level of unwanted
power density into a HAPS ground station antenna in the band
31.3-31.8  GHz shall be limited to 106 dB(W/MHz) under clear-sky
conditions, and may be increased up to ‑100 dB(W/MHz) under rainy
conditions to take account of rain attenuation, provided the effective
impact on the  passive satellite does not exceed the impact under
clear-sky conditions as given above. See Resolution **145
(Rev.WRC‑07)**.     (WRC-03)

**Reasons:** India wants to include its country name in this footnote.
Because the service which is subject to not causing harmful interference
cannot claim protection from harmful interference caused by the other
service or other station in the same service in accordance with No. 5.43
of the Radio Regulations, the phrase "nor claim protection from" is not
necessary in this footnote. It would also need to be modified to update
the reference to Resolution 145 which would be revised at WRC-07.

**MOD** ASP/41A8/69

RESOLUTION 145 (Rev.WRC-07)

Potential use of the bands 27.5-28.35 GHz and 31-31.3 GHz\
by high altitude platform stations (HAPS)\
in the fixed service

The World Radiocommunication Conference (Geneva, 2007),

considering

*a)* that WRC‑97 made provision for the operation of HAPS, also known as
stratospheric repeaters, within a 2  300 MHz portion of the
fixed-service allocation in the bands 47.2-47.5 GHz and 47.9-48.2 GHz;

*b)* that WRC‑97 adopted No. **4.15A** specifying that transmissions to
or from HAPS shall be limited to the bands specifically identified in
Article **5**;

*c)* that at WRC‑2000, several countries in Region 3 and one country in
Region 1 expressed a need for a lower frequency band for HAPS due to the
excessive rain attenuation that occurs at 47 GHz in these countries;

*d)* that some countries in Region 2 have also expressed an interest in
using a frequency range lower than those referred to in
*considering a)*;

*e)* that, in order to accommodate the need expressed by the countries
referred to in *considering c)*, WRC‑2000 adopted Nos. **5.537A** and
**5.543A**, which were modified at WRC‑03 and then again at WRC‑07 to
permit the use of HAPS in the fixed service in the band 27.5-27.8 GHz or
28.05-28.35 GHz and in the band 31-31.3 GHz in certain Region 1 and 3
countries on a non-harmful interference, basis;

*f)* that the bands 27.5-28.35 GHz and 31-31.3 GHz are already heavily
used or planned to be used by a number of different services and a
number of other types of applications in the fixed service;

*g)* that while the decision to deploy HAPS can be taken on a national
basis, such deployment may affect neighbouring administrations,
particularly in small countries;

*h)* that the 31.3-31.8 GHz band is allocated to the radio astronomy,
Earth exploration-satellite (passive) and space research (passive)
services, and that WRC‑03 amended No.** 5.543A** to specify signal
levels that would protect satellite passive services and radio astronomy
stations;

*i)* that ITU‑R has conducted studies dealing with sharing between
systems using HAPS in the fixed service and other types of systems in
the fixed service in the bands 27.5-28.35 GHz and 31-31.3 GHz leading to
Recommendation ITU‑R F.1609;

*j)* that results of some ITU‑R studies indicate that, in the bands
27.5-28.35 GHz and 31-31.3 GHz, sharing between fixed-service systems
using HAPS and other conventional fixed-service systems in the same area
will require appropriate interference mitigation techniques to be
developed and implemented;

*k)* that ITU‑R has conducted studies dealing with compatibility between
systems using HAPS and the passive services in the 31.3-31.8 GHz band
leading to Recommendations ITU‑R F.1570 and ITU‑R F.1612;

*l)* that ITU‑R has produced Recommendation ITU‑R SF.1601 containing
methodologies for evaluating interference from the fixed-service system
using HAPS into GSO FSS systems in the band 27.5-28.35 GHz;

*m)* that HAPS technical issues should continue to be studied in order
to determine appropriate measures for protecting the fixed service and
other co-primary services in the band 27.5-28.35 GHz,

noting

that systems using HAPS may operate in the bands 27.5-28.35 GHz and
31-31.3 GHz under No. **4.4**,

resolves

1 that, notwithstanding No. **4.15A**, in Region 2 the use of HAPS
within the fixed-service allocations within the
\[27.5-27.8\]\[28.05-28.35\][^1] GHz and 31-31.3 GHz bands shall not
cause harmful interference to other stations of services operating in
accordance with the Table of Frequency Allocations of Article **5**,
and, further,

that the development of these other services shall proceed without
constraints by HAPS operating pursuant to this Resolution;

2 that any use by HAPS of the fixed-service allocation at
\[27.5-27.8\]\[28.05-28.35\][^2] GHz pursuant to *resolves* 1 above
shall be limited to operation in the HAPS-to-ground direction, and that
any use by HAPS of the fixed-service allocation at 31-31.3 GHz shall be
limited to operation in the ground-to-HAPS direction;

3 that systems using HAPS in the band 31-31.3 GHz, in accordance with
*resolves *[1]{.underline} above, shall not cause harmful interference
to the radio astronomy service having a primary allocation in the band
31.3-31.8 GHz, taking into account the protection criterion given in the
relevant ITU-R Recommendation in the RA series. In order to ensure the
protection of satellite passive services, the level of unwanted power
density into the HAPS ground station antenna in the band 31.3-31.8 GHz
shall be limited to --106 dB(W/MHz) under clear-sky conditions and may
be increased up to 100 dB(W/MHz) under rainy conditions to take account
of rain attenuation, provided that effective impact on the passive
satellite does not exceed the impact under clear-sky conditions as given
above;

4 that the administrations listed in Nos. **5.537A** and **5.543A**
which intend to implement systems using HAPS in the fixed service in the
bands 27.5-27.8 GHz or 28.05-28.35 GHz and 31-31.3 GHz shall seek
explicit agreement of concerned administrations with regard to their
stations of primary services to ensure that the conditions in Nos.
**5.537A** and **5.543A** are met, and those administrations in Region 2
which intend to implement systems using HAPS in the fixed service in the
bands \[27.5-27.8\]\[28.05-28.35\]^1^ GHz and 31-31.3 GHz shall seek
explicit agreement of concerned administrations with regard to their
stations of services operating in accordance with the Table of Frequency
Allocations of Article **5** to ensure that the conditions in
*resolves* 1 and *resolves* 3 are met;

5 that administrations planning to implement a HAPS system pursuant to
*resolves* 1 above shall notify the frequency assignment(s) by
submitting all mandatory elements of Appendix **4**[^3] to the
Radiocommunication Bureau for the examination of compliance with
*resolves* 3 and 4 above,

instructs the Director of the Radiocommunication Bureau

to publish in the International Frequency Information Circular (BR IFIC)
a list of administrations who have so advised, and to publish the
information on HAPS implementation received from administrations which
intend to implement systems using HAPS in the fixed service in the bands
27.5-28.35 GHz and 31-31.3 GHz.

**Reasons:** For the identification of an appropriate 300 MHz segment in
the band 27.5-28.35 GHz for use by HAPS, most APT Members have a view
that it is appropriate to choose 28.05-28.35 GHz as the common 300 MHz
segment considering that, in the lower part of the band 27.5-28.35 GHz,
there are a number of other existing/planned systems in the primary
services, as well as the identified frequency band (i.e. 27.5-27.82 GHz)
for use by high-density applications in the fixed-satellite service
(HDFSS) in Region 1. Some other APT members have a view that it is
appropriate to choose 27.5-27.8 GHz as the common 300 MHz segment. In
Region 2, the decision on which 300 MHz frequency band is chosen would
be made by WRC-07 based on the proposals from the Region 2
administrations concerned.

It is necessary to clarify the regulatory status applied to the
administrations listed in Nos. 5.537A and 5.543A and the administrations
in Region 2 under this Resolution and to improve the texts for better
reading.

Because the service which is subject to not causing harmful interference
cannot claim protection from harmful interference caused by the other
service or other station in the same service in accordance with No. 5.43
of the Radio Regulations, the phrase "nor claim protection from" may not
be necessary in this Resolution.

In addition, data elements need to be provided with respect to HAPS
systems when an administration intends to implement HAPS for examination
of compliance with "*resolves* 3 and 4".

### Issues under Resolution 122 (Rev.WRC-03) {#issues-under-resolution-122-rev.wrc-03 .heading_b1}

### Introduction  {#introduction .heading_b1}

APT members support Method B in the CPM Report to maintain Resolution
122 (Rev.WRC-03) with certain revisions taking into account recent ITU-R
study results. In order to revise the Resolution and consequential
amendment to the relevant provision, APT members would like to make the
following proposals.

ARTICLE 5

Frequency allocations

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

**MOD** ASP/41A8/70

**5.552A** The allocation to the fixed service in the bands 47.2-47.5
GHz and 47.9-48.2 GHz is designated for use by high altitude platform
stations. The use of the bands 47.2-47.5 GHz and 47.9-48.2 GHz is
subject to the provisions of Resolution **122
(Rev.WRC-07)^\*^**.     (WRC-07)

**Reasons:** ITU-R studies have detailed the operational requirements
for deployment of HAPS in the bands 47.2-47.5 GHz and 47.9-48.2 GHz.

**MOD** ASP/41A8/71

RESOLUTION 122 (Rev.WRC-07)

Use of the bands 47.2-47.5 GHz and 47.9-48.2 GHz by high altitude
platform stations (HAPS) in the fixed service and by other services

The World Radiocommunication Conference (Geneva, 2007),

considering

*a)* that the band 47.2-50.2 GHz is allocated to the fixed, mobile and
fixed-satellite services on a co-primary basis;

*b)* that WRC‑97 made provision for operation of HAPS, also known as
stratospheric repeaters, as a co-primary fixed service allocated in the
bands 47.2-47.5 GHz and 47.9-48.2 GHz ;

*c)* that ITU has among its purposes "to promote the extension of the
benefits of the new telecommunication technologies to all the world's
inhabitants" (No. 6 of the Constitution);

*d)* that systems based on new technologies using high altitude
platforms will be able to provide high-capacity, competitive services to
urban and rural areas;

*e)* that the development of any new infrastructure and service requires
major investment and that manufacturers and operators should be given
the confidence to make the necessary investment;

*f)* that high altitude platform systems are in an advanced stage of
development and some countries have notified such systems to ITU in the
bands 47.2-47.5 GHz and 47.9-48.2 GHz;

*g)* that Recommendation ITU‑R F.1500 contains the characteristics of
systems in the fixed service using HAPS in the bands 47.2-47.5 GHz and
47.9-48.2 GHz including potential band planning concepts in the
allocation of the 2 × 300 MHz sub-bands;

*h)* that while the decision to deploy HAPS can be taken on a national
basis, such deployment may affect neighbouring administrations,
particularly when deployed in small countries;

*i)* that ITU‑R has completed studies dealing with sharing between
systems using HAPS in the fixed service and other types of systems in
the fixed service in the bands 47.2-47.5 GHz and 47.9-48.2 GHz;

*j)* that the radio astronomy service has a primary allocation in the
band 48.94-49.04 GHz;

*k)* that ITU-R has completed studies on compatibility between HAPS
systems in the 47.2-47.5 GHz and 47.9-48.2 GHz bands and the radio
astronomy service in the adjoining 48.94-49.04 GHz band;

*l)* that No. **5.552** urges administrations to reserve fixed-satellite
service (FSS) use of the band 47.2-49.2 GHz for feeder links for the
broadcasting-satellite service (BSS), and that ITU‑R studies indicate
that HAPS in the fixed service may share with BSS feeder links;

*m)* that ITU-R has completed studies dealing with sharing between
systems using HAPS in the fixed service and the fixed-satellite service,

recognizing

*a)* that the bands 47.2-47.5 GHz and 47.9-48.2 GHz are expected to be
required in the long term for HAPS operations for both gateway and
ubiquitous terminal applications, for which several administrations have
already notified systems to the Director of the Radiocommunication
Bureau;

*b)* that Recommendation ITU-R SF.1481-1 concluded that HAPS and
fixed-satellite services cannot share the same frequency in the same
service area and further, placement of a fixed-satellite service station
in an adjoining HAPS service area can affect the operational service of
HAPS in its service provision;

*c)* that ITU-R studies on HAPS operation in the bands 47.2-47.5 GHz and
47.9-48.2 GHz have concluded that, in clear sky conditions, a power
reduction of 5 dB would mitigate interference with the receiver of the
fixed-satellite service space station except in periods of rain but with
an adaptive power control feature in HAPS terminals restoration of power
could be made during such periods of rain;

*d)* that ITU-R studies have established specific power flux-density
values at the international border and recommended bilateral agreement
regulatory sharing conditions for HAPS with other types of fixed service
systems in a neighbouring country,

resolves

1 to encourage administrations to facilitate coordination between
systems in the fixed service using HAPS operating in the bands
47.2-47.5 GHz and 47.9-48.2 GHz and systems of the co‑primary satellite
services in the same bands;

2 that the HAPS characteristics contained in Recommendation ITU-R F.1500
shall be used as the reference system in sharing studies and
coordination considerations with other co‑primary services in the
47.2-47.5 GHz and 47.9-48.2 GHz bands;

3 that a 5 dB power reduction in the power of HAPS user terminals, as
given in Recommendation ITU-R SF.\[4-9S/HAPS-PLMIT: Document 9/1005\],
shall apply, except during periods of rain;

4 that HAPS user terminals shall utilize adaptive power control to
facilitate sharing with FSS space systems;

5 that for the purpose of protecting fixed wireless systems in
neighbouring administrations from co‑channel interference a HAPS system
operating in the frequency bands 47.2-47.5 GHz and 47.9-48.2 GHz shall
not exceed the following p238856E

ower flux-density values at the Earth's surface at an administration's
border, unless explicit agreement of the affected administration is
provided at the time of the notification of HAPS:

--141 dB(W/(m^2^ · MHz)) for  0° ≤ θ \< 3°

--141 + 2.0(θ -- 3) dB(W/(m^2 ^· MHz)) for  3° ≤ θ ≤ 13°

--121 dB(W/(m^2^ · MHz)) for 13° \< θ ≤ 90°

where θ is the angle of the arrival above the horizontal plane of the
Earth;

6 that, to protect radio astronomy stations operating in the band
48.94-49.04 GHz from unwanted emissions of HAPS operating in the
47.2‑47.5 GHz and 47.9-48.2 GHz bands, the separation distance between
the radio astronomy station and the nadir of a HAPS platform shall
exceed 50 km;

7 that administrations planning to implement a HAPS system in the
47.2-47.5 GHz and 47.9-48.2 GHz bands shall notify the radio frequency
spectrum assignments by submitting all mandatory elements of
Appendix **4**[^4] to the Radiocommunication Bureau for the notification
and examination of compliance with respect to *resolves* 2, 3, 4, 5 and
6 above and with a view to registration in the Master International
Frequency Register,

instructs the Director of the Radiocommunication Bureau

1 to maintain and process notices concerning HAPS that were received by
the Bureau prior to 22 November 1997 and provisionally recorded in the
Master International Frequency Register, only until 1 January 2014,
unless the notifying administration earlier informs the Bureau that a
particular assignment has been brought into use;

2 to accept notices in the bands 47.2-47.5 GHz and 47.9-48.2 GHz only
for HAPS in the fixed service and for feeder links for the BSS and for
FSS geostationary satellite networks with earth station antenna
diameters larger than 2.5 m operating as gateway/HUB-type stations, and,
for Region 2, for earth stations and geostationary space stations
operating FSS networks providing service exclusively within Region 2;

3 to examine and apply the provisions of *resolves* 2, 3, 4, 5 and 6
above to all of the HAPS in the fixed service assignments notified to
this date.

**Reasons:** This proposal is a consequence of recent results of ITU-R
studies. The provision of specific pfd values enables the effective
notification, compliance examination and registration (Article 11)
arrangements to the mutual benefit of administrations, operators, and
the ITU-R Bureau

including resource and budget interests as well as providing enhanced
surety in the planning processes and operations of systems sharing the
portion of the radio spectrum. Since the date for maintaining notices
relating to assignments for HAPS needs to be decided, it is proposed to
instruct the Director of the Radiocommunication Bureau to maintain
notices and process concerning HAPS that were received by the Bureau
prior to 22 November 1997 and provisionally recorded in the Master
International Frequency Register, only until 1 January 2014, unless the
notifying administration earlier informs the Bureau that a particular
assignment has been brought into use.

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

[^1]: ^1^ The decision on which 300 MHz frequency band is chosen would
    be made by WRC-07.

[^2]: ^1^ The decision on which 300 MHz frequency band is chosen would
    be made by WRC-07.

[^3]: ^2^ Additional data elements necessary for the Bureau's
    examination may need to be developed and included in Appendix **4**.
    WRC-07 may develop such data elements taking into account the
    preliminary draft new Report ITU-R F.\[HAPS-FS\] (ITU-R Document
    9B/249, Annex 6) developed by ITU-R and information on the
    provisions of adaptive power control features for user terminals.
    The Annex to this document provides an example of HAPS system
    characteristics for such purpose.

[^4]: ^3^ Additional data elements necessary for the Bureau's
    examination may need to be developed and included in Appendix **4**.
    WRC-07 may develop such data elements taking into account the
    preliminary draft new Report ITU-R F.\[HAPS-FS\] (ITU-R Document
    9B/249, Annex 6) developed by ITU-R and information on the
    provisions of adaptive power control features for user terminals.
    The Annex to this document provides an example of HAPS system
    characteristics for such purpose.