ITU-R Working Party 8DStatus Update

International Civil Aviation Organization

Regional Preparatory Group (RPG) Meeting for World Radiocommunication Conference 2007 (WRC-2007), ACP

Working Group B and F and NSP SSG Meetings.

Bangkok, Thailand, 21-25 February 2005.

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Organization• ITU-R

– Radiocommunication• Study Group 8

– Mobile, radiodetermination, amateur and related satellite services

• Working Party 8D– All mobile satellite services and

radiodetermination satellite service

(For more information see http://www.itu.int)

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8D Study Questions of Interest to Aviation

• 110-1/8 Interference to the aeronautical mobile satellite (R) service

• 217/8 Interference to the radionavigation satellite service in the ICAO global navigation satellite system

• 233/8 Technical and operational characteristics for packet network transmission in mobile satellite services

• 236/8 Characteristics and operational requirements of radionavigation-satellite service (space-to-Earth, space-to-space, Earth-to-space) systems

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8D WRC-07 Agenda Items of Interest to Aviation

• AI1.6 (part) ... to study current satellite frequency allocations, that will support the modernization of civil aviation telecommunication systems, taking into account Resolution 415 (WRC-03)– Topic of separate briefing

• AI1.17 to consider the results of ITU-R studies on compatibility between the fixed-satellite service and other services around 1.4 GHz, in accordance with Resolution 745 (WRC-03)– Just need to monitor as needed to ensure protection of aeronautical

systems

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Other Issues (1 of 4): AMS(R)S: Priority and real-time pre-emption

• Driven by migration to generic MSS allocations– AMS(R)S spectrum requirements given priority (5.357A)

• Preliminary Draft New Report being developed– Titled “Determination of feasibility and practicality of prioritization and real-time

pre‑emptive access between different networks of MSS in the bands 1 525-1 559 MHz and 1 626.5-1 660.5 MHz “

– Defines terms, Identifies scenarios, Investigates methodologies, and Determines Feasibility

– Current draft conclusion: “prioritization and intersystem real-time pre-emption” is not practical and unlikely to be feasible at this time.

• Work continues by correspondence, with goal of Draft New Report for next WP8D meeting

– Correspondence Group Coordinator: Mr. Yoshio Suzuki

(E-mail: suzuki@jransa.or.jp)

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Other Issues (2 of 4): Working Document to guide development of PDRRs and

PDNRs concerning RNSS characteristics

• Intended to guide development of PDRRs and PDNRs concerning RNSS system characteristics

• Organizational plan calls for revision of 5 Recommendations and preparation of 2 new Recommendations– Primarily reorganization and addition of new

information

– Agreed that restructuring/revisions would all be addressed/adopted as a package

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Other Issues (3 of 4):Draft revision of Recommendation ITU-R

M.1642• Methodology for determining aggregate

effective power flux density (epfd) levels in 1164-1215 MHz band– Protects ARNS systems from new RNSS– Used in RNSS-provider coordination meetings

to ensure aggregate limits not exceeded (5.328A, Resolution 609 (WRC-2003))

• Draft revision addresses non-GSO RNSS operating in elliptical orbits

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Other Issues (4 of 4): Draft new Report – DME Emissions into

RNSS Receivers

• Intended to quantify impact of DME emissions into RNSS receivers in 1164-1215 MHz band.– Draft Report sent to Study Group 8 for approval

• Draft Report contained outdated information from early compatibility studies (i.e., some assumptions proven to be too pessimistic)– Study Group 8 agreed to send document back to WP8D

for revision

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Draft WRC-10 Agenda Items of Interest to Aviation

(possible 8D attribution)

• AI2.3 to consider results of ITU-R studies in accordance with Resolution 222 (WRC-2000) to ensure spectrum availability and protection for the aeronautical mobile-satellite (R) service, and to take appropriate action of this subject, while retaining the generic allocation for the mobile-satellite service;

• AI3.1 to review the use of the band 5091-5150 MHz by the fixed satellite service (Earth-to-space) (limited to feeder links of the non-GSO mobile satellite service) in accordance with Resolution 114 (Rev. WRC-03);