1. Background Overview

Transcription

1 Technical Contributions to Spectrum Sharing Regulators Ryu Miura, Takayuki Morisaki, and Masayuki Oodo National Institute of Information and Communications Technology (NICT), 1 1. Background Overview 2

2 Terms and Definition of HAPS in ITU (WRC-97~) Radio Regulations ARTICLE 1 Terms and definitions 1.66A high altitude platform station: A station located on an object at an altitude of 20 to 50 km and at a specified, nominal, fixed point relative to the Earth. This definition could be modified and updated in WRC based on the request from administrations 3 WRC Resolutions associated to HAPS Resolution Number 122 Relevant WRC WRC-2000 Rev. WRC- 03 Resolution title Use of the bands and GHz by high altitude platform stations (HAPS) in the fixed service and by other services 145 WRC-03 Potential use of the bands GHz and GHz by high altitude platform stations (HAPS) in the fixed service 221 WRC-2000 Rev. WRC- 03 Use of high altitude platform stations providing IMT-2000 in the bands MHz, MHz and MHz in Regions 1 and 3 and MHz and MHz in Region WRC-2000 Rev. WRC- 03 Feasibility of use of high altitude platform stations in the fixed and mobile services in the frequency bands above 3 GHz allocated exclusively fo terrestrial radiocommunications

3 Current Spectrum Identification for HAPS Freq. high low GHz GHz GHz GHz GHz Worldwide allocation for FS (WRC-97) Heavy rain attenuation (Sharing study ongoing in ITU-R) (up) Regional allocation for FS (WRC-00/03) (Proposed by and APT) (down) 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) Worldwide allocation for IMT-2000 (WRC-2000) (Effort made by Sky Station) 5 WRC: World Radiocommunication Conference, FS: Fixed Service Rain Attenuation in 48 GHz band and 30 GHz band ~ Why do we need Ka band? ~ Rain attenuation in 48 GHz band and 30 GHz band (ITU-R Rec.618-5) Moscow Sydney Shanghai Rome Jakarta Bangkok, Hanoi London Paris Washington, D.C. Tokyo, Seoul GHz band 48GHz band Rain Attenuation (db) 6 In general, lower frequency is better, but more difficult for sharing and coordination.

4 Frequency Sharing with Other Services in 31/28 GHz Band HAPS 28G 28G 28G 28G Communication Satellite 20G FSS Earth Exploration Satellite EES (passive) (adjacent band) (adjacent band) FSS/ES Fixed Satellite HAPS/GS HAPS Ground Station FS/MS Fixed/Mobile RAS Radio Astronomy 7 Active ITU-R Recommendations on HAPS 8 IMT /31 GHz FS 47/48 GHz FS Rec. No. P.1409 F.1500 F.1501 F.1608 F.[PDNR] SF F.1569 F F.1607 F.1609 F.1612 SF M.1456 M.1641 F GHz (FS) Subjects Propagation data and prediction methods Preferred characteristics of the systems Coordination distance of HAPS with other FS systems Frequency sharing with other FS systems Determination of power levels for HAPS ground stations Frequency sharing with satellite systems in FSS Technical and operational characteristics Impact to EESS (passive) Interference mitigation techniques for use by HAPS Interference evaluation to conventional FWA systems Interference evaluation to RAS Interference evaluation methodology to GSO uplink Performance characteristics and operational conditions Co-channel interference evaluation methodology Interference evaluation to RRS above 3 GHz Main contributor Australia, Korea Korea

5 Footnotes Stating the Use of HAPS in 31/28GHz Band (Radio Regulations, Edition of 2004) Article S5 Allocation Table: GHz FIXED 5.537A In Bhutan, Korea (Rep. of), the Russian Federation, Indonesia, Iran (Islamic Republic of),, 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 GHz may also be used by high altitude platform stations (HAPS). The use of HAPS within the band GHz is limited, within the territory of the countries listed above, to a single 300 MHz sub-band. 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 and shall not cause harmful interference to, nor claim protection from, 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 (WRC-03). (WRC-03) Article S5 Allocation Table: GHz FIXED 5.543A In Bhutan, Korea (Rep. of), the Russian Federation, Indonesia, Iran (Islamic Republic of),, 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 GHz may also be used by systems using high altitude platform stations (HAPS) in the ground-to-haps direction. The use of the band GHz by systems using HAPS is limited to the territory of the countries listed above and shall not cause harmful interference to, nor claim protection from, other types of fixed-service systems, systems in the mobile service and systems operated under No Furthermore, the development of these services shall not be constrained by HAPS. Systems using HAPS in the band GHz shall not cause harmful interference to the radio astronomy service having a primary allocation in the band 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 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 (WRC-03). (WRC-03) 9 Countries that can use 31/28 GHz band for HAPS (WRC-2003, Geneva) 10 WRC-2003 Approved in WRC-2000 (Istanbul) Bhutan, Indonesia, Iran (Islamic Republic of),, Maldives, Mongolia, Myanmar, Pakistan, the Dem. People s Rep. of Korea, Sri Lanka, Thailand and Viet Nam Approved 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

6 2. Contribution to CAPANINA 11 EU- Collaboration NICT joined CAPANINA as a non-eu partner (2003) MoU between UoY and NICT (2004) Dispatch of an NICT researcher (Dr. M. Oodo ) to UoY for one year (July 2004-July 2005) (Supervisor: Dr. David Grace) Collaboration items: Joint study on frequency sharing Joint trial using a flying UAV Promotion of research collaboration etc. Contribution to ITU-R from EU/CEPT? (with the support by ) 12

7 New HAPS System Model and Interference Analysis HAP HAP 20 degs. 30 degs. frequency reuse factor: 4 frequency reuse factor: beams 121 beams boundary of cell: -3dB contour of beam boundary of cell: -5 db contour of beam 70km (minimum elevation angle: 30 degs.) 110km (minimum elevation angle: 20 degs.) Proposed CAPANINA model Current model (F.1569) for better sharing and viability - too many beams: less practical - large interference for low elevation angle - RX power at the out of coverage is reduced by 5-12 db - Interference to FSS is reduced by 2 db relative power [db] relative power [db] Measured Radiation Pattern of Prototype HAP Antenna in 28 GHz Rec. ITU-R F measured Rec. ITU-R F measured off-axis angle [degrees] Conventional corrugated horn antenna off-axis angle [degrees] Lens antenna with a corrugated horn feed - Lower main lobe and side lobes 14 7

8 3. Some Updates Towards WRC-2007 and Future 15 WRC-07 Agenda Item 1.8 Summary of Draft CPM Text Resolution 145 (28/31 GHz HAPS) Identification of a common 300MHz segment Two candidates are proposed, GHz portion or GHz portion. Identification of a common segment in either portion. Regulatory and procedural consideration Revision of both RR 5.537A and Resolution 145 is proposed. Resolution 122 (47/48 GHz HAPS) Sharing studies and Regulatory provisions with neighboring countries Studies are on going. The interference issue between FSS and HAPS can be addressed in the WRC-07. Update of RR and Resolution Modification of RR 5.552A and a new Resolution or just modification of Resolution 122 Notification and coordination procedures Similar procedure as FSS, or a new simplified procedures 16

9 17 Possible Further Contributions We need: Refurbishment of Recommendations (Agenda Item 1.8 in WRC-07, Geneva) System models, Antenna patterns, Sharing methodologies Reflecting latest technologies (smart antennas, cognitive radio, Adhoc network, etc.) To support studies on additional spectra in the 3-18 GHz band (Resolution 734) Promotion of worldwide collaboration through R&D, demo trials, symposium, contribution to ITU, and exploitation of killer applications Silence causes the giveback of spectra!