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31/28GHz Bands Spectrum Sharing Studies

David Grace (UOY)

First Annual Review, Brussels 10 February 2005

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Introduction

Why do we want to use 31/28GHz bands in Europe?

Work undertaken in WP2.4

Output to ITU-R Working Party 9B

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Why adopt 28/31GHz for HAPS in Europe

Rain attenuation significantly lower

Effective spectrum sharing should be possibleThe main purpose of submitting docs to ITU 9B

Band required to ensure commercial roll-out of HAPs technology

Higher availability and lower costs of equipmentFixed dishes can be used more widely in place of steerable dishes at 47/48GHzSignificantly greater knowledge of technology at Ka-band Huge (export) market for complementary service provision to terrestrial and satellite

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Activities on HAPS in ITUActivities on HAPS in ITUCurrent Spectrum IdentificationCurrent Spectrum Identification

47.9-48.2 GHz

47.2-47.5 GHz

31.0-31.3 GHz

27.5-28.35 GHz

1.9-2.1 GHz

Fre

q.h

igh

low

Worldwide allocationfor FS (WRC-97)

Regional allocation for FS (WRC-00/03)(Proposed by Japan and APT)

(up)

(down)

Worldwide allocation for IMT-2000 (WRC-2000) (Effort made by Sky Station)

WRC: World Radiocommunication Conference, FS: Fixed Service

Heavy rain attenuation(Sharing study ongoing

in ITU-R)

Made available in 20 countries in Asia and Russia,and all countries in North/South American countries.

But restriction for HAPS still remained.(Sharing study ongoing in ITU-R)

Courtesy of NICT, Japan

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Countries that can use 31/28 GHz band Countries that can use 31/28 GHz band for HAPS (WRC-2003, Geneva)for HAPS (WRC-2003, Geneva)

Approved in WRC-2000 (Istanbul)Bhutan, Indonesia, Iran (Islamic Republic of), Japan, Maldives, Mongolia, Myanmar, Pakistan, the Dem. People’s Rep. of Korea, Sri Lanka, Thailand and Viet NamApproved in WRC-2003 (Geneva)The Rep. of Korea, Russian Federation, Kazakhstan, Lesotho, Malaysia, Uzbekistan, Philippines, Kyrgyzstan, and all the countries in North and South American region

WRC-2003

Courtesy of NICT, Japan

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Work on Spectrum Sharing 1

Exploiting expertise of established ITU WP 9B attendees Dr Masayuki Oodo (NICT) on secondment to UOYProf Young-Heung Kang on secondment to UOY from Kunsan University, Korea

Discussed in detail in D10

Interference Studies using HeliNet Parameters

FSS/ES HAPS/GS FS/MS RAS

FSS

EESS

28G

28G31G(Adjacent)

31G(Adjacent)31G

28G

31G

HAPS

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Work on Spectrum Sharing 2

‘European HAPS’ model definitionReduced number of cellsHigher elevation angleIdentifying typical antenna patterns

On going work is looking at more advanced ways of spectrum sharing E.g. multiple HAPs sharing a common coverage area

27.5 28.35 28.5 31.0 31.3 31.8 (GHz)

FIXED1

FIXED-SATELLITE (Earth-to-space)MOBILE2

EESS (passive)RASSPACE RESEARCH(passive)

FIXED1

MOBILES5.149

HAPS(downlink)

HAPS(uplink)

worldwide

some countriesexcluding Europe

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Example Results

HAP Cell

P- MP Cell

BSGS

AS

Interference

Bh

r

Nadir

AS: HAP Airship Station GS: HAP Ground StationBS: P- MP Base Station

Cellular reuse – cluster 3

In general using the HeliNet Parameters, interference is far less of a problem

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ITU-R Working Party 9B Documents

To be submitted to 22 April 2005 MeetingVia Slovenia/Spain subject to national approvalMajor political battle due to the perceived implications on terrestrial B-FWA

Proposed Preliminary Draft Revision of Rec ITU-R F.1569 Alternative HAPS system model for interference evaluation in the 28 and 31 GHz bands

Working Document Toward PDRR of Rec ITU-R F.1569Measured radiation patterns of prototype onboard antenna designed for HAPS in the 28 GHz band

Preliminary Draft Revision of Recommendation ITU-R SF.1609Interference evaluation from fixed service systems using high altitude platform stations to conventional fixed service systems in the bands 27.5-28.35 GHz and 31-31.3GHz

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Conclusions

Spectrum sharing work has shown that the main

issues are

HAPS GS interfering with B-FWA Terminal Stations

Can be mitigated with DCA (and in practice by clutter)

Up to 3 documents submitted to ITU-R WP9B

The first documents on use of 31/28 GHz for HAPS from

Europe (subject to politics)