International Civil Aviation Organization

INFORMATION PAPER

ACP-WGF24/WP-17

AERONAUTICAL COMMUNICATIONS PANEL (ACP)

TWENTY FOURTH MEETING OF WORKING GROUP F

Paris, France 17 – 21 March 2011

Agenda Item 8: Any other business

Removal of Footnotes 5.357 & 5.376

(Presented by John Mettrop, UK)

SUMMARY

This paper proposes the deletion of footnotes 5.357 & 5.376 as it is unlikely to be of any assistance to aviation and could be a hindrance.

ACTION

Support the development of a proposal by a State and/or regional body to seek the removal of footnotes 5.357 & 5.376 under agenda item 1.7

1. INTRODUCTION

1.1 At the last WRC the Bureau Director raised the following issue and proposed solution with respect to footnotes 5.357 & 5.376

“The terrestrial uses authorized by these provisions appear to be closely related to the operational conditions within a combined aeronautical system using space and terrestrial radiocommunications. As the Bureau has no means to verify such uses, the Board established Rules of Procedure whereby these provisions are considered as additional allocations to the aeronautical mobile (R) service. The concerned Rules of Procedure could be incorporated in Nos. 5.357 and 5.376 by introducing this additional clarification

5.357 Additional allocation:  Transmissions in the band 1 545-1 555 MHz is also allocated to the aeronautical mobile (R) service on a primary basis. The use of this band in the aeronautical mobile (R) service is limited to transmissions from terrestrial

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ACP-WGW01/WP-01

aeronautical stations directly to aircraft stations, or between aircraft stations, in the aeronautical mobile (R) service are also authorized when such transmissions are used to extend or supplement the satellite-to-aircraft links.

5.376 Additional allocation:  Transmissions in the band 1 646.5-1 656.5 MHz is also allocated to the aeronautical mobile (R) service on a primary basis. The use of this band in the aeronautical mobile (R) service is limited to transmissions from aircraft stations in the aeronautical mobile (R) service directly to terrestrial aeronautical stations, or between aircraft stations, are also authorized when such transmissions are used to extend or supplement the aircraft-to-satellite links.”

1.2 The wording proposed by the Bureau was not acceptable to WRC-07 and whilst several attempts were made to find better wording none were acceptable. The meeting therefore agreed that no changes should be made to the wording.

2. DISCUSSION

2.1 Since the conference the possibility of using a mobile application in the same bands have been studied within Europe with these footnotes being referenced as examples of where this has been done in the past. Three reports are being developed, one dealing with compatibility with Non GSO MSS systems , the second with GSO MSS and the third with non-MSS systems. The study report dealing with compatibility with non GSO MSS systems has not yet been formally approved but the document has reached a level of maturity where it has been sent to States for final comment before it is approved by the ECC and published. The second and third reports are still being considered by CEPT although little work has been done on these reports since 2009 . A copy of the reports, are included in the attachment to this document.

2.2 The results of that study show that it is not practical for a ubiquitous ground system to be deployed in the same band as a satellite system and hence sharing is not feasible. This being the case then it is unlikely that an aeronautical mobile (R) service could be, and aviation has no plans to, deployed in the same spectrum as is used for aeronautical mobile satellite(R) services.

2.3 It is therefore proposed to delete footnotes 5.357 & 5.376. This will therefore resolve the Bureau’s issue about how to interpret the two footnotes as well as removing what could be a dangerous precedent.

3. ACTION BY THE MEETING

3.1 The ACP WG-F is invited to:

Support the development of a proposal by a State and/or regional body to seek the removal of footnotes 5.357 & 5.376 under agenda item 1.7

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ACP-WGF22/WP-

Attachment 1

CEPT STUDY ON“COMPATIBILITY STUDY BETWEEN COMPLEMENTARY GROUND COMPONENT AND

OTHER SYSTEMS”

Compatibility with non-GSO MSS systems

Compatibility with GSO MSS systems

Compatibility with non-MSS systems

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