1. Next Generation Cross Support Transfer Services Based on the SLE Experience
ESAW Workshop 2009
Martin Götzelmann, VEGA
Yves Doat, ESA/ESOC
Margherita di Guilio, ESA/ESOC

2. Background, Motivation, and Objectives
Presentation Outline
Background, Motivation, and Objectives
CSTS Specification Framework Concept
CSTS Specification Framework Overview
Constructing Services with the Framework
Development Support
History, Status, and Plans
Conclusions
CCSDS Cross Support Transfer Services

3. SLE Success Story (2002 to 2009) SLE Service Provider SLE Service User
Svalbard
Tromsø
Kiruna
ESOC
Redu
Saskatoon
Roskosmos
Neustrelitz
St. Hubert
Weilheim
Denver
CNES/
Toulouse
DLR/GSOC
Goddard
Madrid/CEB/VIL
CNSA
Usuda
JAXA
Goldstone
Whitesands
Xi'an
Ibaraki
JPL
Maspalomas
Uchinoura
Huston
Bangalore
ISRO
Kourou
Malinidi
Santiago
Hartebeestoek
New Norcia
Perth
Canberra
O'Higgins
Kerguelen
SLE Service Provider
SLE Service User
Troll
CCSDS Cross Support Transfer Services

4. Agencies demand standards for new servcies, e.g.
Why a new Approach?
Agencies demand standards for new servcies, e.g.
Monitoring of SLE service provisioning
On-line streaming of tracking data
Transfer of unframed telemetry data
Development of SLE Services considered too expensive
Analysis
Each service specified by a self contained book
Large effort for development "from scratch"
Large amount of duplication
Maintaining consistency is labour intensive & error prone
Objective: Can we define reusable building blocks for specification & implementation of services?
CCSDS Cross Support Transfer Services

5. Building Block 1 - Operation
Service User
Service Provider
BIND
Establish an association with the provider for the service instance
Service User
START
INVOKER
Start service provisioning
Invocation
TRANSFER-DATA
Transfer one Space Link Data Unit
Return
TRANSFER-DATA
TRANSFER-DATA
port
STOP
Stop service provisioning
Service Provider
PERFORMER
UNBIND
Release the association with the service provider
CCSDS Cross Support Transfer Services

6. Building Block 2 - Procedure
Bind
Service User
Service Provider
Information Query
Get
Schedule Status Report
Cyclic Report
Status Report
Start (data selection)
Association
Control
Transfer-Data
Transfer Data
Sync-Notify (end of data)
Buffered Data Delivery
Stop
Unbind
CCSDS Cross Support Transfer Services

7. CSTS Specification Framework - Concept
CSTS L
service
CSTS Specification Framework
PRC 1
PRC 2
PRC M
procedure
OP 1
OP 2
OP 3
OP 4
OP N
operation
To be generally useful, specifications in the framework must be abstract
To be useful for a given real service, abstract specifications must be specialised
CCSDS Cross Support Transfer Services

8. Abstraction & Specialisation - Procedures
CSTS
Specification
Framework
RAF Status Report
Periodically report RAF specific status parameters
OPS: Schedule Status Report
Status Report
Unbuffered Data Delivery
Deliver unspecified data as soon as generated by the provider, drop in case of congestion
OPS: START, STOP, TRANSFER-DATA
Cyclic Report
Periodically report parameters specified by start to the user
OPS: START, STOP,
TRANSFER-DATA
RAF Status Report
Periodically report RAF specific parameters specified by start to the user
OPS: START, STOP,
TRANSFER-DATA
CLTU Status Report
Periodically report CLTU specific parameters specified by start to the user
OPS: START, STOP,
TRANSFER-DATA
TBD Service
Deliver specified data selected by start to the user
OPS: START, STOP,
TRANSFER-DATA
CCSDS Cross Support Transfer Services

9. Abstraction & Specialisation - Operations
CSTS
Specification
Framework
START (confirmed)
standard operation header
RAF, RCF, CLTU, ROCF, FSP operations
Start
Schedule Status Report
Cyclic report START
standard operation header
list of parameters
delivery cycle
Buffered Data Delivery START
standard operation header
start time
stop time
RAF START
standard operation header
start time
stop time
frame quality
(time = earth receive time)
CCSDS Cross Support Transfer Services

10. CSTS Framework Population
CSTS Specification Framework
Cyclic Report
Buffered
Data Delivery
Notification
Throw Event
Association Control
Unbuffered Data Delivery
Data Processing
Information Query
Bind
Unbind
Peer
Abort
Start
Stop
Transfer
Data
Process
Data
Notify
Get
Execute
Directive
CCSDS Cross Support Transfer Services

11. Constructing Services with the Framework
Service constructed directly from procedures in the framework
Monitoring Data
CSTS
CSTS Specification Framework
Cyclic Report
Buffered
Data Delivery
Notification
Throw Event
Association Control
Unbuffered Data Delivery
Data Processing
Information Query
Bind
Unbind
Peer
Abort
Start
Stop
Transfer
Data
Process
Data
Notify
Get
Execute
Directive
CCSDS Cross Support Transfer Services

12. Constructing Services with the Framework
Service deriving new procedures form those defined in the framework
Tracking Data
CSTS
TD Status Report
Tracking
Data Delivery
TD Config. Query
CSTS Specification Framework
Cyclic Report
Buffered
Data Delivery
Notification
Throw Event
Association Control
Unbuffered Data Delivery
Data Processing
Information Query
Bind
Unbind
Peer
Abort
Start
Stop
Transfer
Data
Process
Data
Notify
Get
Execute
Directive
CCSDS Cross Support Transfer Services

13. Procedure States & Service States
start
unbound
inactive
active
bind
unbind
abort
stop
Prime Procedure Instance
start
start
inactive
active
inactive
active
stop
stop
unbound
Secondary Procedure Instance
CCSDS Cross Support Transfer Services

14. CSTS Development Kit - Motivation
SLE Provider
Application
SLE User
Application
inv
ret
Operation
return
Operation
invocation
Operation
return
Operation
invocation
inv
inv
inv
ret
ret
ret
Service
Instance
Service
Instance
SLE API
SLE API
Technology Specific Implementation
Technology Specific Implementation
Inv. PDU
Ret. PDU
The SLE API and the ESA API Package have contributed significantly to the success of SLE services
The CSTS Specification has been developed with the explicit intention to support development of reusable SW components
BUT CCSDS does not specify such components
CCSDS Cross Support Transfer Services

15. CSTS Development Kit - Concept
CSTS Application (User or Provider)
association control
operation
invocation
inv
ret
inv
ret
operation
return
Procedure 1
Procedure N
Service Instance
CSTS
DevKit
Technology Specific Implementation (Default: ISP1)
CSTS DevKit Concept developed for ESOC
CCSDS Cross Support Transfer Services

16. Cross Support Transfer Service Specification Framework
CCSDS CSTS Books
Cross Support Transfer Service Specification Framework
Cross Support Transfer Service Specification Framework Concepts
Guidelines for Specification of Cross Support Transfer Services
Recommended Standards
Informative Report
CCSDS Cross Support Transfer Services

17. Prototyping
Dummy service used to validate the CSTS Specification Framework
Prototyping covers core concepts, not all features of the framework
ESA/CNES prototypes include prototyping of the CSTS DevKit
Dummy Service Provider
Dummy Service User
Monitoring Service Provider
Monitoring Service User
CCSDS Cross Support Transfer Services

18. History, Status, and Plans
Participating
Agencies
Event
Date
Start of work in CCSDS
2004
Agreement in CCSDS on the general approach
Sep. 2005
Completion of
CSTS Specification Framework
Guidelines for Specification of CSTS
CSTS Specification Framework Concepts
Jul. 2009
Start of Agency Review
Nov. 2009
Framework Prototyping Completed
Oct. 2009
Monitoring Data CSTS Recommendation completed
Tracking Data CSTS Recommendation completed
Jan. 2010
CCSDS Cross Support Transfer Services

19. The CSTS Specification Framework specifies
Conclusions
The next generation Cross Support Transfer Services build on proven SLE Concepts
The CSTS Specification Framework specifies
generic building blocks from which a CSTS can be constructed
rules for specialisation of building blocks and construction of services
The CSTS Specification Framework has the potential to
Reduce time and cost for development of new servcies
Enable development of reusable software components
First steps have been taken with development of the CSTS Development Toolkit concept
CCSDS Cross Support Transfer Services