1
WGN05
-
IP04
AERONAUTICAL COMMUNICATIONS PANEL (ACP)
Working Group N
-
Networking
Information Paper
Report on the European Organization for Civil Aviation Equipment (EUROCAE)
Working Group 67 Proceedings for Voice over Internet Protocol
in Air Traffic
Management
Prepared by: Leon Sayadian (FAA)
March 2005
SUMMARY
This information paper is a report on the proceedings of the 6
th
meeting of EUROCAE Working
Group 67 (WG
-
67) and their subgroups, held at Eurocontrol headquarters i
n Brussels, Belgium to
develop a technical specification for Voice over Internet Protocols (VoIP) implementations in Air
Traffic Management (ATM) systems.
2
1. Background
Current ATM Ground
-
to
-
Ground (G
-
G) voice communication systems use TDM
-
based, point
-
to
-
point,
analog technology, which has not been cost
-
effective. However, in recent years, newer advances have
enabled the integration of voice and data in a common medium, which is enabled with TCP/UDP/IP
networking. Adopting this VoIP technology for ATM w
ill achieve the following benefits:
Enhanced Quality of Services (QoS), security, and safety
Improved cost over the current systems
Enhanced system scalability and flexibility
Integrated management
To realize these benefits in ATM communications, EUROCAE
WG
-
67 developed the Terms of Reference
(ToRs) and working objectives for VoIP in ATM. The ToRs were approved by the EUROCAE Council on
July 7
th
, 2004.
2. Scope
This paper describes the on
-
going work effort of the EUROCAE WG
-
67 and subgroups. The purpose
of
these groups is to develop VoIP specification and guidance documents for use in the development of G
-
G
infrastructures for ATM voice communications.
3. Objectives
The WG
-
67 divided into three sub
-
working groups in charge of the following tasks
-
as de
scribed in section
2 of the ToR
-
to perform the following ATM Voice Communications tasks:
WG67
-
1: Requirement Sub Group
(led by Eurocontrol) will define VoIP ATM System operational and
technical requirements at the application and transport layers. Docum
ent deliverables include:
-
End
-
to
-
End delays and parameters for voice and signaling
-
Monitoring/Recording functions
-
General/Management functions
-
System availability
-
Network performance
Delivery of these documents to SG2 will be expected by mid 20
05.
WG67
-
2: Interoperability Sub Group (
led by CS
-
France) will define applicable standards/protocols for
VoIP (e.g., H.323 series, SIP, MGCP, IAX, and RTP/RTCP over TCP/UDP/IP), and interfaces between
VoIP components, to fulfill operational and technical
requirements of telephone and radio stations.
Document deliverables include:
-
Voice Coding/Encoding and MOS
-
Signaling standards
3
-
Recording Interfaces
-
Management standards
-
Protocols and Parameters for ES and IS (e.g., Routers, Servers, Gateways
, Adapters)
-
Radio interfaces for ground stations
-
End
-
to
-
End QoS standards
Final versions of these documents are expected by April 2006.
WG67
-
3: WAN Sub Group (
led by DFS of Germany) will write WAN/LAN performance requirements to
fulfill QoS, safety
, network security, availability, and functional requirements for Intra
-
and Inter
-
domain
networking, using IPv4 and IPv6 technology. Using data from
SG1
and
SG2,
the following documents will
be developed:
-
Network design guidelines regarding existing in
frastructure and transitioning to future technology
-
Network security policy and protocols (e.g., IPSec, VPN, and MPLS)
-
IP addressing plan and policy for IPv4 and IPv6
-
Network QoS monitoring and reporting
-
System redundancy and switch
-
over times
-
Any
-
cast and multicast services
A final comprehensive release of all WG
-
67 documentation is expected by May 2006.
The interrelationships and workflow among the WG
-
67 subgroups is shown in Figure 1 below.
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Figure 1
–
WG
-
67 Workflow
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4. Progress of WG
-
67
The sixth meeting of WG
-
67 on VoIP was conducted in Brussels, Belgium on January 25
–
26, 2005. At this
meeting, the subgroups convened and defined their tasks, schedules, and responsible participants. One
outstanding WG
-
67 issue is to originate a new subgroup SG
-
4 (Validation and Tests) to identify sponsorship
for validating and verifying the WG
-
67 deliverable documentation (e.g., technical specifications, guidance
materiel). The WG
-
67 Chairman will send a WP to the EUROC
AE Council to approve the creation of SG
-
4.
It was estimated that the final WG
-
67 deliverables document would be ready by the third quarter of 2006,
which will now include validation and verification findings of the recommended technologies.
Once the WG
-
67 deliverables are approved by appropriate European standards organization(s), they will be
presented to ICAO/ANC panel WG
-
N for consideration as a recommended basis for the integration of VoIP
services in the future ATN.
Upcoming WG
-
67 meetings are sche
duled as follows:
-
March 17
–
18, 2005, Place: Florence/Italy (OTE)
-
May 11
–
12, 2005, Place: Bucharest (ROMATSA)
5. Glossary
ATM
Air Traffic Management
ES
End System
EUROCAE
European Organization for Civil Aviation Equipment
FAA
Federal Aviation A
dministration
G
-
G
Ground
-
to
-
Ground
IP
Information Paper
IPv4 and 6
Internet Protocol versions 4 and 6
IS
Intermediate System
LAN
Local Area Network
MGCP
Media Gateway Control Protocol
MOS
Mean Opinion Score
QoS
Quality of Service
RTCP
Real
-
time Con
trol Protocol
RTP
Real
-
time Protocol
SG
Sub Group
SIP
Session Initiation Protocol
TCP
Transport Control Protocol
ToR
Terms of Reference
UDP
User Datagram Protocol
VoIP
Voice over Internet Protocol
WAN
Wide Area Network
WG
Working Group
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