Required Total System Performance (RTSP)

Bernard Miaillier EUROCONTROL

Agenda Item 3

EUROCONTROL

Genesis of RTSP

• RCP, RNP, RSP• Conceived within the FANS Committee• For CNS Performance Requirements

• Notion generalised to RTSP

• ICAO ATMCP tasked to investigate feasibility

• Future ATM to be performance based (incl. safety)(see Agenda Item 1, WP/4 - operational concept )

• Complex topic, initial work aimed at ANC/11

Need for Performance Orientation

• ATM serves society and air traffic stakeholders• Various expectations, safety comes first• Performance, always a reference:

“safe, orderly and expeditious flow of traffic”

• Performance orientation trend in economy• Communicate on goals, achievements

• Current and future requirements • Plans and actual levels

• Support / facilitate decision making• Understand the effect of changes• To move system development

from add-ons to goal driven

4

A Performance Framework to Structure Discussion

• Three pillars– A hierarchy of ATM Performance Concepts– Accurate models of ‘what drives what’

• e.g. cause/effect relationships between expectations, functions, system components, concept of use, architecture

– Rigorous description of traceable performance parameters

• An approach: ISO13236 Quality of Service Framework

Hierarchical ATM Performance Concepts & Models

Level 1: Political and socio-economic requirementssafety, security, environmental efficiency, costs, etc.

Level 1: Political and socio-economic requirementssafety, security, environmental efficiency, costs, etc.

Level 2: RASPsafety, throughput, delay, predictability, flexibility, etc.

Level 2: RASPsafety, throughput, delay, predictability, flexibility, etc.

Level 3: RTSPon operational functions/entitiesset of characteristics

Level 3: RTSPon operational functions/entitiesset of characteristics

RfnPRfnPRf1PRf1P

Level 4: System Requirementsfor an airspace and/or type of userssets of consistent enabler requirements, e.g. RNP, RCP, etc.

Level 4: System Requirementsfor an airspace and/or type of userssets of consistent enabler requirements, e.g. RNP, RCP, etc.

{ … }{ … }

{ … }{ … }

Level 5: Standards & specifications (technologies)tech. SARPs, MOPS, standards, ISO90xy, etc.

Level 5: Standards & specifications (technologies)tech. SARPs, MOPS, standards, ISO90xy, etc.

ActualPerformanceMeasurement& Monitoring

Illustration• RNP

– navigation accuracy

• RCP– 95% transit delay

– message integrity

– reliability/availability

Illustration• RNP

– navigation accuracy

• RCP– 95% transit delay

– message integrity

– reliability/availability

Quality of Service (QoS) Framework ISO 13236

• Use for RTSP seems appropriate for • ATM system constituents, even operational services

– they can be represented in terms of information processing

• Describing underlying technical services

• Main requirements covered by 4 characteristics

• Delay - Transient responsiveness• Capacity - Throughput• Integrity - Accuracy• Reliability - Availability

From Expectations to System Characteristics

RTSPRTSPRASPRASP

ATM System

“SMART” Metrics“SMART” Metrics

Trade-offs, except for safetyTrade-offs, except for safety

Global / regional / local targets Vs global standards

Global / regional / local targets Vs global standards

Operational concept Scenarios

System architecture

Operational concept Scenarios

System architecture

Expectations

RTSP: an aggregate of ATM system component requirements

• Describes the performance of the ATM Concept Components in a given environment– Adapted to local and user needs– Defined for most demanding characteristics– Not independent from available implementation options

• balance between generic (to keep implementation flexibility), specific (to prevent proliferation of solutions)

– Driven by most stringent requirements• likely: conflict management and navigation (real-time, safety related

decisions)

• Summed up by a few Categories only ?

RTSP / Performance in ICAO Activities

• Framework to facilitate co-ordination of individual contributions

• Planning Tool • Global, regional or local: same model,

consistency, harmonisation • For the target situation and the implementation

steps towards it

• Monitoring Tool • Against objectives, at appropriate level• Feed back is essential

Future Work

• Feasibility to be confirmed

• Define metrics• Further develop the framework • Distribute individual aspects to panels with an overall

consolidation body• Keep momentum on SARPs development and planning

Priorities• Upper layers, definition of indicators/targets• Understand ATM system behaviour

Agenda Item 3: Expected Discussion Outcome

• WP/8: basis for discussion

• Conference expected to – Support performance orientation for future

ATM definition – Call for, and support, more work to

• Formulate and define objectives/targets & metrics• Harmonise all contributions within an overall

framework.