ATN PresentationATN Presentation

December 2001December 2001

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

ATN Router PackagesATN Router Packages

AirborneEnd System

Airborne Router(Boundary Intermediate System)

GroundEnd System

Ground Router(Boundary Intermediate System)

End System Intermediate System

AirborneSystem

GroundSystems

Conceptual Model of The ATN

End System (ES) End System (ES)

Application ProcessApplication Process

ApplicationEntity

Upper LayerCommunications

Service

InternetCommunications

Service

Application ProcessApplication Process

ApplicationEntity

Upper LayerCommunications

Service

InternetCommunications

ServiceIntermediateSystem (IS)

IntermediateSystem (IS)

ATN EndATN End--toto--EndEnd

ATN Communication Services EndATN Communication Services End--toto--EndEnd

ATN Internet Communication Services EndATN Internet Communication Services End--toto--EndEnd

Subnetwork Subnetwork Subnetwork

AirborneEnd System

Mobile Network

Airborne BoundaryIntermediate System

UpperLayer

TransportLayer

NetworkLayer

Data LinkLayer

PhysicalLayer

EndSystem

UpperLayer

TransportLayer

NetworkLayer

Data LinkLayer

PhysicalLayer

EndSystem

UpperLayer

TransportLayer

NetworkLayer

Data LinkLayer

PhysicalLayer

Ground/GroundBoundary

Intermediate System

NetworkLayer

Data LinkLayer

PhysicalLayer

SARPs

Class-4

Router

Air/GroundBoundary

Intermediate System

NetworkLayer

Data LinkLayer

PhysicalLayer

SARPs

Class-5

Router

NetworkLayer

Data LinkLayer

PhysicalLayer

SARPs

Class-6

Router

Ground Network

ATN Router Classes

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 ApplicationATN Application

ATNATNInternetInternet

ESES ESES

ISIS

ISIS

ISIS

ISIS

ISIS

ESES ESES

ATN ApplicationATN Application ATN ApplicationATN Application

ISIS

ATN ApplicationATN Application

ATN ApplicationATN Application

ESES

ATN Building Components

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

RDNRD3

RD2RD1

IS

ES IS

IS

BIS

BIS

BIS

IS

BIS

IS ES

ES

IS

ATN Internetworking

Inter-Regional Trunk ConnectionNew Inter-Regional Trunk ConnectionIntra-Regional Trunk ConnectionNew Intra-Regional Trunk Connection

NAM Region

EUR Region

MID Region

AFI Region

APAC Region

Asia/Pacific ATN Regional Backbone

AU

CN JP

IN

TH

SG

HK

• US is North America Backbone• This is an example, it is subject to be changed

Asia/Pacific ATN Routing

AU

CN JP

IN

TH

SG

TO TV WFPF

FJNZ

ID

KR

NR

CK KI NC WS

NP

MO

TW

VUPG SBBD

VN

BNPH

MM

MV

LKBT

KH

LA MY

KP MN

NU

US

MH FM PWAS

ATN Backbone Site

ATN Site

HK

• US is North America Backbone• 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)

• 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 ApplicationsAMHS

• 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.

ATN G/G ApplicationsAMHS

AMHS

ATN End System

AFTN/AMHS Gateway

AFTN Station AFTN StationAFTNATNAMHS

AFTN

ATSMHS Traffic FlowATN End System

AFTN/AMHS Gateway

ATN G/G ApplicationsAIDC

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

BISAIDC

BISES ES

Aircraft Flight

AIDC Flight notification, coordination, and transfer between regions

LegendAIDC ATS Inter-facility Data CommunicationBIS Boundary RouterES End SystemFIR Flight Information Region

ATN

BIS AIDCES

ES

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)

CMCMContext 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

Ground-ground CMInformation Exchange

Ground SystemGround System Ground System

Air-ground CMInformation Exchange

Air-ground CMInformation Exchange

CM Application Information Exchange

FIS and D-FISFIS and D-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.

ADSADS

ADS Ground System

ADS Ground System

ADS Ground System

ADS Report Forwarding

ADS

Cont

ract

ADS Con

tract

ADS Contract

Topology of the ADS and ADS Report Forwarding Applications

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.

Display CMU/ATSUATN compliant

VDRTransceiver

A/G ServiceProvider(s)Domain

Aircraft Domain

G/G ATNBIS

Router

A/G ATNBIS

Router

VDL-2 GroundStations

ECG(PAMRIupgrade)

HCS

LIU

R

WideArea

Network

G/G ATNRouter

HID/NAS LAN (orECG Upgrade)

URET CCLD

NSM

NAS LANHID

Router

EAI LAN

CP

HGW

DS GW

Controller ConsolesD A M & C

DS

DS LCN

DLAP CMA*

EDISupport

HAL SAR

To CTAS LANHNL

Router

* Miami and Cleveland ARTCCs only

Potential Integration CPDLC Architecture

CPDLC

G/G ATNRouter

ATN Air/Ground Architecture

ATNInternet

Router

Router

Router

Router

TerminalCPDCLServer AOC Traffic

AMHSServer

Data EntryProcessor

Data EntryProcessor

ManagementProcessor

ManagementProcessor

Data EntryProcessor

ManagementProcessor

ES

AvionicsSubnetwork

Airline GroundSubnetwork

Service ProviderSubnetwork

CAASubnetwork

ATN Router

ATN Router ATN Router

AeronauticalOperationsData Base

ESES ES

FIS Data BaseATCWeatherData Base

AeronauticalOperationsControl

WeatherData Base

ES ES ES

VHFSubnetwork

SatelliteSubnetwork

Mode SSubnetwork

HFSubnetwork

ATN ArchitectureATN Architecture

ES ES ES