Transcript CPDLC Sweden

CPDLC Sweden –
ATN/IPS based Point to Point communications
Purpose, Functionality, Carry out, Goals and Value
Presented at ICAO ACP WG-I 10-05-19
By
Robin Hughes
Purpose
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)
2
Flygtrafiktjänsten
2008-09-24
Objectives
Create a platform for future development of applications defined by the Single
European Sky Implementing Rule for Datalink services, which is future proof
Ascertain if there are any changes needed to standards for VDL4
Update the VDL4 groundstations and necessary ground network to handle Mobile IPv6
traffic
Ascertain processes for achieving certification and meeting safety requirements
Ensuring that all documentation is in place for successful operational
implementation
CPDLC & CM
Application Layer
3
CPDLC & CM
Designed for OSI
Dialogue Service
for OSI -> MIPv6
TCP/UDP Layer
TCP/UDP Layer
IP Layer
IP Layer
Link Layer
Link Layer
Physical Layer
Physical Layer
Flygtrafiktjänsten
2008-09-24
Project Organisation & External input
Project
Management
&
Administration
Cockpit and
Controller
Environment Team
Applications
HMIs
Network Team
Ground &
Air Network
CNS Systems
Validation Team
Safety
Certification
In all ~5 FTEs including manufacturers contribution
External guidance by ICAO WG-I
Functionality validated by Eurocontrol (Eivan Cerasi)
Coordination with FP6 – NEWSKY project
4
Flygtrafiktjänsten
2008-09-24
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
5
Flygtrafiktjänsten
2008-09-24
Network topology during trials
EFB
EFB
VDL4000/GA
RS-232
VDL4000/GA
RS-232
Airborne System
Ground system
C4S N/W
(VPN VDL4)
Bromma
ATCC
Visby
Home Agent (HA)
Norrköping
AOC
VDL Management Entity
(VME)
Test station
6
Flygtrafiktjänsten
2008-09-24
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)
7
Flygtrafiktjänsten
2008-09-24
Flight trial carry out
Demonstration of communication via Controller Pilot Datalink Communications (CPDLC) ground/air
Mimic current implementations of CPDLC as far as possible within budget
CPDLC
8
Flygtrafiktjänsten
2008-09-24
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.
9
Flygtrafiktjänsten
2008-09-24
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.
10
Flygtrafiktjänsten
2008-09-24
Result
COTS 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 sec
CPDLC 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.
11
Flygtrafiktjänsten
2008-09-24
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)
12
Flygtrafiktjänsten
2008-09-24
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.
13
Flygtrafiktjänsten
2008-09-24
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
14
Flygtrafiktjänsten
2008-09-24
THANK YOU!