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Enhanced Broadcast Solutions for Aeronautical Communications Panel Meeting

This information paper discusses the need for efficient point-to-point communications in aeronautical messaging, proposing solutions for broadcast capabilities to support various functions like D-ATIS, SIGMET, and Aircraft Microphone Check. The paper outlines the implementation details for Addressing and Network Service Access Point (SNAP) for effective broadcast scope and addressing in the Aeronautical Operational Control (AOC) environment. It also addresses the challenges and potential enhancements related to ATN implementation, broadcast SNDCF, and AOA ground station integration.

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Enhanced Broadcast Solutions for Aeronautical Communications Panel Meeting

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  1. AERONAUTICAL COMMUNICATIONS PANEL (ACP)SEVENTEENTH MEETING OF THE WORKING GROUP MBangkok, Thailand 31 January – 1 February 2011INFORMATION PAPERUplink Broadcast SNDCF R. Morgenstern, MITRE

  2. Statement of Problem • Point-to-point communications inefficient for some messaging • D-ATIS in the vicinity of the airport • SIGMET • NOTAMs • Aircraft Microphone Check (AMC) • AEEC DLK providing broadcast capability for AOA similar to POA network • It could be beneficial if solution included ATN interface

  3. Broadcast scope • All aircraft for a particular Ground Station • All aircraft for a cluster of Ground Stations • All aircraft of a particular airline • A subfleet of a particular airline

  4. Proposed AOA Implementation • For AOA ground station addressing, use AP or GL TEIs to address a pre-defined GS or cluster of GSs • E.g., AP AL10, AP IAD1 • For AOA addressing, use existing A620/618 AN/FI TEIs to address user fleet/subfleets • E.g., AN AL-B737/FI AL9999, AN BA-XXXX/FI BA9999 • No acknowledgement to broadcast messages • Duplication detection based on UBI • Generate new UBI for each unique uplink broadcast • Use same UBI for broadcasts over more than 1 GS • Only one ACARS uplink sent per GS • No uplink ACARS timers (GT1, GT2) • Limited to one ACARS block

  5. Proposed ATN Implementation • Reconstitute CLTP in ICAO Doc 9880, Part III • Utilize destination NSAP to identify scope of broadcast • Routers would need to recognize address and realize it might need to multicast to reach all relevant GSs • E.g., ARS = 0xFFFFFFh and accept all LOC/SYS fields • Create Broadcast SNDCF to bypass current Mobile 8208 sublayer

  6. ATN NSAP Addressing • For CLNP addressing, use 0xFFFFFF for ARS • Then LOC can determine the scope of the broadcast • And SYS can determine the specific GS, cluster, airline and/or airline subfleet • SEL = 02h consistent with AsiaPac use to indicate ISO 8602 CLTP ground or air ES

  7. Possible LOC/SYS Encoding • LOC • 0000h reserved • 0001h Single GS • SYS = unique GS identifier, such as SiteID/RadioID • 0002h Airport • SYS = 0000h + 4character Airport Code • 0003h ACC/TRACON • SYS = FFFFFFh + 3character facility code (e.g., “ZTL”) • SYS = sectorID + 3character facility code (e.g, “N90”) • 0004h-FFFEh reserved • FFFFh All GS in ADM region/country • SYS = FFFFFFFFFFFFh

  8. VDL Mode 2 Interfacing • Use UI frame in AVLC • Use IPI/EIPI to identify destination applications and bypass 8208 sublayer • AOA continues to use current 0xFFh • ATN: • CPDLC (AMC, Advisories), FIS, ADS-C, AOC/FOC • ARINC750 radio implementations limited to only 3 addresses stored, so can’t use AVLC addressing to isolate sub-sets of a ground station’s coverage • AOA has means to provide filtering based on A620/618 address • For ATN, addition of a Broadcast Scope field following the IPI/EIPI is possible • Alternately, just pass all to CLNP and let it filter

  9. Status • AEEC DLK proceeding with AOA broadcast capability to support AOC needs • FAA has action to document need for broadcast capability to RTCA SC214/EUROCAE WG78 • Coordination with WG92 when it is started • LINK2000 already experiencing some D-ATIS-related congestion • AMC application can overload channel for large/busy airports depending on scope of use

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