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ATN Presentationpresentation ATNATN PresentationPresentation DecemberDecember 20012001 The ATN Overview ATN (Aeronautical Telecommunication Network) • ATN is a global aviation standard telecommunications network, and is intended to provide seamless ground-to- ground and air-to-ground communication services • ATN is a dynamic telecommunications network designed to support projected traffic increase due to Air/Ground Service ATNATN RouterRouter PackagesPackages Airborne Airborne Router System Airborne (Boundary End System Intermediate System) Ground Ground Router End System (Boundary Ground Intermediate System) Systems End System Intermediate System Conceptual Model of The ATN End System (ES) End System (ES) Application Process ATN End-to-End Application Process Application Application Entity Entity ATN Communication Services End-to-End Upper Layer Upper Layer Communications Communications Service Service ATN Internet Communication Services End-to-End Internet Internet Communications Intermediate Intermediate Communications Service System (IS) System (IS) Service Subnetwork Subnetwork Subnetwork ATN Router Classes Airborne Boundary Intermediate System Upper Layer 6 s - r P s s te R Transport la u A o Airborne Layer S C R End System Network Network Layer Layer Data Link Data Link Layer Layer Physical Physical Layer Layer Mobile Network Ground/Ground Air/Ground End Boundary Boundary End System Intermediate System Intermediate System System Upper Upper 5 s - r 4 P s Layer s - r s te Layer P s e R s t la u R A o la u C A o S R Transport S C R Transport Layer Layer Network Network Network Layer Network Layer Layer Layer Data Link Data Link Data Link Layer Data Link Layer Layer Layer Physical Physical Physical Physical Layer Layer Layer Layer Ground Network ATN Service • Accommodate different grades of service • ATN consist of: – ATN internet – ATN subnetworks – ATN applications, such as AMHS, AIDC, CPDLC … ATN Internet • ATN Internet is made up of Intermediate Systems (IS or router), End Systems (ES or computer), and communication links. They form an ATN global internet ATN Building Components ATN Application ATN Application ES ATN Application ES ES ATN IS Internet IS IS IS IS IS ES ES ATN Application ATN Application ATN Boundary Intermediate Systems (BIS Routers) • BIS router ensure the routing of application to its destination • For mobile systems, provides for dynamic routing • ATN defines different types of routers – static or dynamic intra-domain routers – inter-domain routers (boundary intermediate systems -- BIS) ATN Internet Backbone • The interconnection of ATN BIS (Router) form an ATN backbone provide ATN internetworking service, such as current planned Asia/Pacific ATN regional BIS backbone network ATN Internetworking RDN IS RD3 BIS ES BIS IS IS RD1 BIS RD2 IS ES ES IS BIS IS Asia/Pacific ATN Regional Backbone CN JP EUR Region HK TH NAM Region MID Region SG IN AU AFI Region APAC Region Inter-Regional Trunk Connection New Inter-Regional Trunk Connection • US is North America Backbone Intra-Regional Trunk Connection • This is an example, it is subject to be changed New Intra-Regional Trunk Connection Asia/Pacific ATN Routing CN JP KR KP MN MO HK MM NP VN TW US TH LA MY AS MH FM PW KH BT BD LK PH BN ID NR PG SB VU MV ATN Site IN SG AU ATN Backbone Site NZ FJ • US is North America Backbone NU PF CK KI NC WS TO TV WF • This is an example, it is subject to be changed ATN Internet Protocols • ATN Internet Protocols – ISO/IEC 8473 Connectionless Network Protocol (CLNP), all ATN End Systems and Routers shall support the CLNP. – ISO/IEC 10747 Inter-Domain Routing Protocol (IDRP) required by all inter-domain routers - air-ground data links - between domains – ISO/IEC 9542 End system to Intermediate system routing exchange protocol (ES-IS) – ISO/IEC 10589 Intra-Domain-Routing & IS-IS Protocol (IS-IS) ATN Internet Protocols • ATN Internet Protocols – CLNP does not guarantee successful delivery of data; the end-to-end transport protocol is required to support reliable data streaming. * ISO/IEC 8073 Class 4 Transport Protocol (TP4 with mandatory checksum support) × Connection mode protocol × Provides end-to-end flow control × Retransmit lost packet * or ISO/IEC 8602 Connectionless Transport Protocol (CLTP) ATN Subnetworks • A subnetwork is part of the communication network, but is not part of the ATN. • It is defined as an independent communication network, which is used as the physical means of transferring information between ATN systems. ATN Subnetworks Almost any data communications network can be an ATN Subnetwork: – X.25 – Frame Relay –LAN – Aeronautical Mobile Satellite – VHF Digital Link – Leased Lines, etc ... ATN Application ATN Ground-to-ground applications include: • AMHS (ATS Message Handling System) • AIDC (Air Traffic Inter-facility Data Communications) ATN G/G Applications AMHS • ATS Message Handling System (AMHS) is designed to process ATS messages (Flight Plan, NOTAM, etc… • AMHS will only process messages to it end user of its domain • AMHS also perform as a gateway for AFTN/CIDIN as required ATN G/G Applications AMHS • ATS Message Handling System (AMHS) is the Message Handling System (MHS) for Air Traffic Control, which is: – running X.400 protocol, – ATS Message Server, – ATS Message User Agent, and – AFTN/AMHS Gateway or CIDIN/AMHS. AMHS ATN End System AFTN AFTN/AMHS Gateway AFTN/AMHS Gateway AFTN Station ATN AFTN AFTN Station AMHS ATSMHS Traffic Flow ATN End System ATN G/G Applications AIDC The AIDC application automatically exchanges ATC information between ATSU in support of the ATC functions relating to: • NOTIFICATION of flights approaching an FIR boundary, • CO-ORDINATION of boundary crossing conditions, and • TRANSFER of control at the FIR boundary AIDCAIDC t Flight Aircraf ES BIS AIDC ATN ES Legend AIDC ATS Inter-facility Data Communication BIS Boundary Router ES End System FIR Flight Information Region AIDC ES BIS BIS ES AIDC Flight notification, coordination, and transfer between regions ATN Air-to-ground application • Air-to-ground applications include: – CM (Context Management) – FIS (Flight Information Services) – ADS (Automatic Dependent Surveillance) – CPDLC (Controller Pilot Data Link Communications) CMCM Context Management (CM) application allows an aircraft and the ground systems to exchange and update data link application information. – CM exchanges the address information of ADS, CPDLC, and FIS between air and ground. – Prior to data link activities, air CM initiates log-on to ground CM which responds to the logon request with appropriate address information to ground counterparts ADS, CPDLC, and FIS to air CM. – After receiving appropriate address information, aircraft begins communicating with the ground ADS, CPDLC, and FIS. CMCM CM Application Information Exchange Air-ground CM Air-ground CM Information Exchange Information Exchange Ground-ground CM Information Exchange Ground System Ground System Ground System FISFIS andand D-FISD-FIS • Flight Information Service (FIS) provides pilots (or avionics) with information that increases flight awareness and enhances flight safety. • Data Link FIS (D-FIS) provides pilots (or avionics) with information from ground systems via Data Link. ADS • Automatic Dependent Surveillance (ADS) is designed to give automatic reports to a user, which provide positional, dimensional information, and aircraft identification to the Air Traffic Management function. ADS Contract ADS Ground System ADS A D S C Topology of the ADS and ADS Report Forwarding Applications o n t r a c t ADS Ground System A DS Co ntract ADS Report Forwarding ADS Ground System CPDLCCPDLC Controller Pilot Data Link (CPDLC) provides two ways communication between pilot and controller, but using data link rather than voice • Exchange of Controller/Pilot messages. • Transfer of authority between current and next data authorities. • Downstream* clearance delivery with downstream authorities. *Downstream is ahead of the aircraft, toward the destination. CPDLC Potential Integration CPDLC Architecture CMU/ATSU VDR Display ATN compliant Transceiver Aircraft Domain HID/NAS LAN (orECG Upgrade) To CTAS LAN A/G Service HNL Provider(s) NSM Router Domain NAS LAN HID Wide VDL-2 Ground URET CCLD Area Stations Router Network ECG HCS CP DLAP CMA* (PAMRI EAI LAN upgrade) HGW EDI A/G ATN DS GW Support BIS * Miami and Cleveland ARTCCs only Router DS G/G ATN G/GG/G ATNATN HAL SAR Router BIS LIU Router DS LCN R D A M & C Controller Consoles ATN Air/Ground Architecture Router Router ATN Internet Router Router CPDCL Server AOC Traffic Terminal AMHS Server ATNATN ArchitectureArchitecture Management Data Entry Data Entry ManagementManagement Processor Processor Processor ProcessorProcessor ES ES ES ES Avionics Subnetwork ATN Router VHF Satellite Mode S HF Subnetwork Subnetwork Subnetwork Subnetwork ATN Router ATN Router Service Provider Subnetwork CAA Airline Ground Subnetwork Subnetwork ES ES ES ES ES ES Aeronautical Aeronautical Operations Operations Weather ATC FIS Data Base Weather Data Base Control Data Base Data Base.
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