EUROCAE WG67 EDs 136, 137, 138, 139 Status and Progress

EUROCAE WG67EDs 136, 137, 138, 139Status and ProgressPresentation to Voice Communications WorkshopPrepared and presented by EUROCAE WG67 chairman Guy POTIRON (DSNA)With support from WG67 members and specially fromChris Clegg (ECTL), Hervé Pottier (CS), Armin Biegel (DFS) and Hansjoerg Seipp (DFS)Brussels 2009 February 4th1

Background and scope• Components of Ground-Ground ATM voice systems are currentlyusing digital (TDM/PCM - Time Division Multiplexing / Pulsed CodeModulation) or analogue technology• Convergence of voice and data into one multimedia network isobserved on the market.• Voice over IP Technology may fulfil and improve operational andtechnical ATM voice communication requirements,• Pan-European Network Services (PENS) will be offering IP Voicecommunications capability from 2010, for ATM purposes anytimeafterwards2

WG67 works• Define IP Voice ATM Systems and identify their components(Voice Communication System / VCS, Telephone Ground-Ground communication, Ground based Radio Station /Recording, Supervision)• Four documents written by the different subgroups have been created to fullfillthe WG67 objectives:– ED136 (SG1): Voice over Internet Protocol (VoIP)Air Traffic Management (ATM) System Operational and Technical Requirements– ED137 (SG2): Interoperability Standards for VoIP ATM Components• Part 1: Radio• Part 2: Telephone• Part 3: Recording• Part 4: Supervision– ED138 (SG3): Network Requirements and Performances for VoIP ATM Systems• Part 1: Network Specification• Part 2: Network Design Guideline– ED139 (SG4): Qualification tests for VoIP ATM Components and Systems3

Bodies involved• European ANSPs : ACG, AENA, Belgocontrol, DFS, DSNA, ENAV, LVNL, NATS,ROMATSA• FAA• European ATM Suppliers: VCS and GRS• Telecom equipment suppliers: CISCO, NORTEL• Telecom Operators: SITA• RTCA and appropriate regulators and standardisation bodies (ICAO,Eurocontrol, ITU, ETSI …)• Liaison with military will be maintained by organisations such as Eurocontrol,Suppliers…• Results of WG 67 are anticipated to be presented to ICAO panel ANC forconsideration as international recommendations.• TORs approved on July 2004by EUROCAE Council4

Vienna AgreementDefine IP Voice ATM Systems and identify their components (VoiceCommunication System / VCS, Ground based Radio Station / GRS…)5

WG67 deliverables• ED-136 – Voice over IP ATM System Operational and Technical Requirementsto define and develop VoIP ATM System operational and technical requirements• ED-137 - Interoperability Standards for VoIP ATM Componentsto define first, IP standards to fulfil operational and technical requirements,secondly to develop IP interfaces between IP components as defined in “ViennaAgreement”• ED-138 - Network Requirements and Performances for VoIP ATM Systemsto define and develop Network requirements and performances to fulfil QoSrequired to interconnect IP components• ED-139 - Qualification tests for VoIP ATM Components and Systemsto define and develop validation requirements for VoIP ATM System andComponents6

ED 136, 137, 138DEVELOPMENT, APPROVAL & PLANNINGPROCESSWG : Final Draft 1:December 2006-March 2008Internal WG67 consensus: Draft on web and sent toworldwide CAC (Civil Aviation Community)EnlargedConsultationMay 2008-July 2008WG Final Draft 2 taking inaccount comments from CACDecember 2008Request for comments (comments sheetfilled) from CAC: Analysis of all comments byWG67 and draft amendment as required bySGsFinal Draft 2 and summary of commentanalysis to CouncilEurocae Council Approval:February 2009Publication:February 20097

ED-136Voice over IP ATM System Operational andTechnical Requirements8

Requirements – Two Principle Subjects• Ground Telephone• Radio9

Ground TelephoneExample• Instantaneous Access (IA) Calls- established within 1 second or less for 99% ofcall attempts (ICAO Doc 9804 Table 1-1)- called party position monitoring10

RadioPossibly the first attempt at definitive Requirements?• First taskproduce baseline reference model of currentsystems• Second taskobtain performance data (actual & standards)11

Baseline Model - Scope•‘Basic’ air-ground radio•Multi-carrier (Climax)•Frequency Cross-Coupled•Best-signal selection (BSS)12

Signalling Requirement80 ms 20 ms100 ms50 ms 50 ms100 ms13

Voice Latency Requirement120 ms 10 ms130 ms105 ms 25 ms130 ms14

Radio – Special Notes• Requirements are the most stringent for Hi-DensityAirspace (and may be relaxed for other applications)• Now incorporated into the ECTL/FAA doc ‘CommsOperating Concept & Requirements (COCR) V2’15

ED 137Interoperability Standardsfor VoIP ATM Components16

•ED 137-2•TelephoneED137 specification domains•ED 137-1•Radio•ED137-3•Recording17

ED 137-1RADIO18

RADIO signalling principles• Session initialization based on SIP protocol (RFC 3261)– SIP allow to adress dynamically any radio– Call initiation is done through SIP mechanism. Voice is managedthrough RTP Extender.• Permanent monitoring of the session by using « keep alivemessage » between Ground radio equipment and VCS site• Audio protocol: Based on RTP/RTCP (RFC 3550).• Radio Control signalling using additional informations added inRTP protocol (RTP Extender field):– PTT, A/C– Audio quality index– Time stamp parameters for CLIMAX use– Reserved field for future or proprietary use• Proposed CODEC: G711 , and optional G728 or G72919

Radio to VCS Communication principles20

RTP Extender principlesEthernet/UDP PacketsEthernet/UDP Packets~Ethernet/IP~- PTT (8 possible values)- Reserved for future UseEthernet/UDP PacketsEthernet/UDP Packets~Ethernet/IP~Audio- A/C (Aircraft Call)- Reception quality index- CLIMAX Time stamp- PTT Control- Reserved for future or proprietary Use21

ED137-2TELEPHONE22

TELEPHONE signalling principles• Session initialization based on SIP protocol (RFC 3261)– SIP allow to adress dynamically any correspondent– Call initiation is done through SIP mechanism. Voice is managedthrough RTP Extender.• Audio protocol: Based on RTP/RTCP (RFC 3550).• Proposed CODEC: G711 , and optional G728 or G729• Signalling interworking between:– Eurocontrol ATS-R2 and SIP– ATS-R 5 and SIP– ATS-QSIG and SIP• Additional features as Priority Call, Instantaneous Call andConference Call specified for existing and future VCScommunication architecture implementation.23

TELEPHONE Protocol StackApplication and System ControlInterworking functionSIP SuiteSupplementary Services(Intrusion, Instantaneous Access, Call hold, Conference…)RTCPAudiocodingfunctionsATS-R2ATS-No.5ATS-QSIGBasic SIP+ Extension headers+ Added Methods+ Message Body (SDP)RTPTCP/TLSUDPIPIP network lower layers24

TELEPHONE Interoperability• interoperability with existing VCS through IPnetwork– VCS SIP VCS– VCS SIP ATS-R2– VCS SIP ATS-R5– VCS SIP ATS-QSIGSIPVCSVCSSIPWANSIPATS R2InterfaceATS R5InterfaceVCSVCSATS QSIGinterfaceVCS25

ED137-3RECORDING26

• Today: recording is provided by the VCS.RECORDING• The ED137-3 document allow to make profit of the ETHERNET functionalities byspecifying the audio communication frame to a recorder.• Radio Recording is based on active sessions opened from clients (User Terminal,Radio Transmitter/Receiver or specific 3rd party devices) to one recording device• User Terminals participating a Telephone G/G communication session have toprovide a single audio stream that summarizes all incoming (IN) and outgoing (OUT)audio streams.27

RECORDING• Session initialization with recorder is based on SIP protocol (RFC 3261)• RTSP based on RFC 2326 is proposed to establish, terminate andmodify recording sessions• Record data include the following information:– Voice– Telephone call identification– Radio channel identification– Time– Connecting and release time– Priority– Direction (Incoming-Outgoing)28

ED 138Network Requirements andPerformances for VoIP ATM Systems29

ED138The purpose of ED138 is to specify the network requirements andthe needs of VoIP network services for ATM applications - includingIP Adressing and Security - that are to provide the necessary highlevels of availability, integrity, performance and Quality of Service(QoS) for VoIP in ATM applications.ED-138 is divided into two parts:• ED-138 Part 1– Network Specification– Security Policy– IP Addressing Plan• ED-138 Part 2– Network Design Guideline30

IP SecurityTechnical Security Policy• Required security architecture and component mechanisms• Different security zones are defined with different requirementsSecurityZone 1SecurityZone 2Responsibility ofIP Core ProviderIP CoreEdgeIP CoreIP CoreEdgeIP CoreEdgeIP Core couldbe PENSPossible InterconnectionsSecurityZone 3Responsibility ofANSPs/OrganizationsOrganizationEdgeOrganization(WAN)LANOrganizationEdgeOrganization(WAN)LANOrganizationEdgeOrganization(WAN)LANAdminNetwor32

IP Addressing SchemeIP AddressingPAX• Totally based on TF * results.• Usage of IPv6 is mandatory for full interworkingRIPE Responsibilty(32 bits)3 13 13 3 3 13 16 64FP TLA ID Sub-TLA Res. NLA ID SLA ID Interface IDF1Net.Prefixv4/v6F2SiteLocationLANESI3 bits7 bits1 bit5 bitsvariable bitsvariable bits64 bitsCommon Responsibilty(Coordination Body)(16 bits)ANSP Authority(80 bits)The IPv6 addressing scheme is regularly presented to the EUROCONTROL EATM Communication Team33* EUROCONTROL EATM Internet Protocol for Aeronautical Exchange Task Force

Network Design Guideline• The purpose of ED138 Part 2 is to give solutions and guidelines to fulfill therequirements.• The document also supports to understand existing standards• More than 200 pages give a comprehensive overview about VoIP architecture,protocols and network designs.Simple tasksscheduling.Complex tasksmarkingrEdge router:• Traffic Classification• Policing• ShapingCore router:DSCP Data• Buffering and Scheduling based on marking at edge• Assured Forwardingb34

ED 139Qualification tests for VoIP ATMComponents and Systemsto be published mid 200935

ED 139 target:how to validate components and interfaces36

A Step by Step ValidationNetwork levelValidation progressEquipmentlevelSystemlevelInterface level37

Test validation definitionPassED 136-RequirementsEnvironmentED 137-SpecificationsTestcases&ProceduresValidationGuidelinesDeviceundertestED 138-SpecificationsFail38

Hands on (interoperability test)and forecast• 1st Plugtests in March 2008 (stage 1)http://www.etsi.org/WebSite/NewsandEvents/2008_04_EUROCAE.aspx• 2nd Plugtest in March 2009 (stage 1 and2)http://www.etsi.org/plugtests/eurocae2/eurocae.htm• VoIP- R2 & ATS-QSIG Gateway Test inautumn 200939

EDs STATUS (February 2009)• three documents with a common reference to« Vienna Agreement » are published byEUROCAE for utilization within VoIP ATMSystem:– ED-136 - Voice ATM System Operational andTechnical Requirements– ED-137 - Interoperability Standards for VoIPATM Components– ED-138 - Network Requirements andPerformances for VoIP ATM Systems• ED-139 - Qualification tests for VoIP ATMComponents and Systems should bepublished mid 200940

Actions to go further toImplementation phase• ED 136, 137, 138 validation through ETSIPlugtests and SESAR Projects with supportof ED 139• Define and developp VoIP ESSI from ED 136,137 and 138• To include ED 136, 137, 138 within ICAOSARPS for GG Voice (including GG segmentfor AG communication)• To start validation of ATM VOIP over PENSfrom 201041

ATM VoIP standardisationa necessary Role for each Body• Every European Organization was and is needed:– EUROCAE mixing closely and friendly in the same forum (WG, SGs,Review Team) all stakeholders:• Users expressing operational requirements and validating technicalsolutions proposed by Industry• Industry proposing technical solutions fulfilling operational requirementsand limiting over-specified requirements from users– ETSI allowing, thanks technical (IP) skills and neutral arbitration furingshort Interoperability Plugtests, to accelerate maturation of draftstandards : very good efficiency/cost ratio– SJU and EUROCONTROL standard validation– EUROCONTROL preparation of global ICAO standardization, EuropeanSingle Sky Implementation (ESSI) objective definition and follow-up– EU/EC for European legal framework : IR?, CS?, ..Conclusion: Cooperation is needed between all these Bodies42

Thank you for your attentionEUROCAEThe European Organisation for Civil Aviation Equipment102, rue Etienne Dolet 92240-Malakoff (France)Phone: +33 1 40 92 79 30Web site: www.eurocae.eu43