cpdlc sweden - international civil aviation organization€¦ · ppt file · web view ·...

CPDLC Sweden – ATN/IPS based Point to Point

communicationsPurpose, Functionality, Carry out, Goals and Value

Presented at ICAO ACP WG-I 10-05-19By

Robin Hughes

2008-09-24Flygtrafiktjänsten2

Develop a Point to Point (P2P) datalink communication service over VDL4

Verify ATN/IPS address protocol defined by the ICAO Manual for the Aeronautical Telecommunication Network (ATN) using Internet Protocol Stack (IPS) Standards and Protocols (ICAO Doc 9896)

Implement datalink services Context Management and CPDLC as defined in the ATN/OSI manual (ICAO Doc 9880)

Purpose


Objectives

Physical Layer

Link Layer

IP Layer

TCP/UDP Layer

Application Layer CPDLC & CMDesigned for OSI

CPDLC & CMDialogue Service for OSI -> MIPv6

Physical Layer

Link Layer

IP Layer

TCP/UDP Layer

Create a platform for future development of applications defined by the Single European Sky Implementing Rule for Datalink services, which is future proofAscertain if there are any changes needed to standards for VDL4Update the VDL4 groundstations and necessary ground network to handle Mobile IPv6 trafficAscertain processes for achieving certification and meeting safety requirementsEnsuring that all documentation is in place for successful operational implementation


Project Organisation & External input

Project Management

& Administration

Cockpit and Controller

Environment Team Network Team Validation Team

Applications Ground & Air Network CNS Systems Safety CertificationHMIs

In all ~5 FTEs including manufacturers contribution

External guidance by ICAO WG-IFunctionality validated by Eurocontrol (Eivan Cerasi)Coordination with FP6 – NEWSKY project


Supporting documentation• ICAO Doc 9880

MANUAL ON DETAILED TECHNICAL SPECIFICATIONS FOR THE AERONAUTICAL TELECOMMUNICATION NETWORK (ATN) using ISO/OSI standards and protocols

• ICAO Doc 9896 Aeronautical Telecommunication Network (ATN) Manual for the ATN using IPS Standards and Protocols (Doc 9896)

• Eurocae Doc 120B SAFETY AND PERFORMANCE REQUIREMENTS STANDARD FOR AIR TRAFFIC DATA LINK SERVICES IN CONTINENTAL AIRSPACE (CONTINENTAL SPR STANDARD)

• RTCA DO-178B Software Considerations in Airborne Systems and Equipment Certification

I.e. All according to governing and open standards


Network topology during trials

VDL4000/GA

Home Agent (HA)

Bromma

ATCC

Ground system

Airborne System

EFB

VDL Management Entity (VME)

AOC

Visby

Norrköping

Test station

C4S N/W(VPN VDL4)

RS-232 VDL4000/GAEFB

RS-232


Availability of ATN/IPS today

•All of Sweden is covered (apart from most northern part)•In all 10 sites have ATN/IPS installed•The solution coined “Ground NEMO” has proven most

beneficial• Allows considerable bandwidth savings with the reduction of a full

IPv6 header. • Virtual NEMO routers set up in the link groundstations and move

around the network, providing the mobility.• Provides the opportunity to introduce IP services to Windows based

platforms where a lack of mobility stacks is a reality of today, common in Electronic Flight Bags

• Allows early benefits/implementation of the ATN/IPS network and associated services (e.g. MET applications or advisory services)


Flight trial carry outDemonstration of communication via Controller Pilot Datalink Communications (CPDLC) ground/airMimic current implementations of CPDLC as far as possible within budget

CPDLC


NARSIM Air Traffic Control Simulator

•An ATC simulator constructed by NLR and modified by LFV.

•Used by LFV for simulations and validations, e.g. ERAT, TMA2010.

•Can display live traffic received via ADS-B ASTERIX cat 21 messages.

•Extended with data link capability for CPDLC messaging.



CDTI – Cockpit Display of Traffic Information•Developed by LFV for use

in simulations and live trial validations, e.g. D-AIM, Runway Incursions.

•Designed to be used on touch screen laptops.

•Extended with CPDLC messaging capability.



ResultCOTS implementation and utilisation of ICAO standard enabled realisation in 11

months

Average Median 95 % of messages

99% of messages

99.99% of messages

ED 120 Requirement N/A N/A 4 sec 8 sec 40 secCPDLC Sweden utilising Ground Nemo solution

1.458s 0.894s 3.5 sec 6 sec 15.8 sec

• Based on “per messages” in a set of three messages.

• Payload was 31, 13 and 31 bytes respectively.

• UDP headers gives total message sizes of 79, 61 and 79 bytes respectively.

• Message sizes chosen to ensure the latency would be based on similar size of messages as most of the worst case, i.e. largest, messages defined for current CPDLC communications.


Value and Maturity

Utilisation of COTS and open standards in CPDLC Sweden for ATN/IPS is in accordance with SESAR goals for lower costs of systems and SWIM

In House developed HMIs are at V2 (Prototypes)/V3(Live trial)

Hardware and software ground-air components are all at V3/V4 (Industrialisation)


Next step

•Implementation of “Robust Header Compression Framework (ROHC) as specified in RFC 4995

• Reducing the IP headers considerably (~4bytes)• New latency tests are scheduled during October 2010.

•After the finalization of frequency planning parameters for VDL Mode 4, implementation in the band 118-137 MHz was finalized. Activities on implementation in the band 112-117.975 MHz has continued in ICAO Navigation Systems Panel (NSP) and in ICAO ACP WG-F. The work is now in its final stage.


The meeting is invited to:

•Note the information presented in this paper•Note that VDL Mode 4 is available for operational services

based on IPv6•Provide advice on how further activities in the IPv6 based

infrastructure in Sweden can be used in support of further verification of the ICAO ATN/IPS provisions

THANK YOU!

cpdlc sweden - international civil aviation organization€¦ · ppt file · web view ·...

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