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May 2004 1
SLS AREA REPORT
SLS AREA REPORT
CESG MEETING
Montreal, 17 May 2004
CONSULTATIVE COMMITTEE FOR SPACE DATA SYSTEMS
May 2004 2
SLS AREA REPORT
CONTENTS
• LIST OF CURRENTLY ACTIVE WGs AND BOFs
• SUMMARY TECHNICAL STATUS OF EACH WG & BOF
• CROSS-AREA TECHNICAL ISSUES
• OTHER ISSUE AND CONCERNS
• PROPOSED RESOLUTIONS/ACTION ITEMS
May 2004 3
SLS AREA REPORT
1. SLS-RFM WG Radio Frequency & Modulation
2. SLS-RNG WG Ranging
3. SLS-SLP WG Space Link Protocols
4. SLS-PROX1-BUILD2 WG Proximity-1 Build-2
5. SLS-C&S WG Coding & Synchronisation
6. SLS-TCC WG Telemetry Channel Coding
7. SLS-LEC BOF Long Erasure Codes
8. SLS-DC Data Compression
LIST OF CURRENT WGs AND BOFs
May 2004 4
SLS AREA REPORT
SUMMARY TECHNICAL STATUS
1. SLS-RFM WG (1)
Goal: Update RF & Mod BB for modulations and to align with ITU WRC and SFCG23&24
Working Status: Active _X_ Idle ____
Summary progress:
Progress since last meeting:
23 recommendations editorially reviewed
Revised recommendation 2.4.10 (channel input and coding conventions for QPSK systems pink sheet)
Work in progress on another 15 recs (completion Nov 04)
status: OK CAUTION PROBLEM
comment: As per charter … …except rec 2.4.18
May 2004 5
SLS AREA REPORT
SUMMARY TECHNICAL STATUS
1. SLS-RFM WG (2)
Problems and Issues (1)
Status of Rec 2.4.18 Mod & Coding for High rate P/L TM
• Raised blue June 2001 with 2 caveats:
Requires use of 8PSK TCM if SFCG max BW cannot be met with ‘conventional modulations’
Points to Rec 2.4.1 for conventional modulations which may be used if SFCG rec met
Principle contents of Rec 2.4.1 agreed at the time
SFCG abandoned the idea of max BW in the 8GHz band. Usage of the band still under discussion.
No consensus at this meeting on contents of rec 2.4.1. No Rec 2.4.1 in the BB
May 2004 6
SLS AREA REPORT
SUMMARY TECHNICAL STATUS
1. SLS-RFM WG (3)
Problems and Issues (2)
SLS Area position:
- try and resolve the deadlock at the RFM meeting Fall 2004
- Report to CESG Fall 2004
May 2004 7
SLS AREA REPORT
SUMMARY TECHNICAL STATUS
2. SLS-RNG WG
Goal: Rec for Novel Ranging Techniques
Working Status: Active _X__ Idle ____
Summary progress:
Progress since last meeting:
First iteration on requirements completed
Review of existing Recs on ranging completed. Pink sheets Rec 2.5.6B
Work on regenerative (PN code) ranging is progressing at fast pace
Problems and Issues: none
status: OK CAUTION PROBLEM
comment: As per charter
May 2004 8
SLS AREA REPORT
SUMMARY TECHNICAL STATUS3. SLS-SLP WG
Goal:Link Layer Protocols for High Rate Telemetry Missions
Working Status: Active _X__ Idle ____
Summary progress:
Progress since last meeting:
1) Enhance AOS frame to accommodate larger seq. #s and 32Kb length. Draft Pink Sheet submission to CESG June 30th.
2) Issue Red-2 of Encapsulation Service (makes encapsulation pkt hdr 32-bit compatible)
3) Informal review of 2 Link layer Green books
Problems and Issues: See next VG
status: OK CAUTION PROBLEM
comment: Per updated Charter
May 2004 9
SLS AREA REPORT
CROSS-AREA TECHNICAL ISSUES
None
May 2004 10
SLS AREA REPORT
OTHER ISSUES AND CONCERNS
A. Need Agency support, i.e. resources to supply downlink transfer frame accountability reports to share amongst agencies to determine what FeC codes CCSDS should recommend.
B. SLS-SLP to provide SANA with link layer parameters and requirements, which require standardization by SANA.
May 2004 11
SLS AREA REPORT
SUMMARY TECHNICAL STATUS4. SLS- Prox-1 Build-2 WG
Goal: Fix known errors in Prox-1 Phy. & Data Link Blue Books
Working Status: Active _X__ Idle ___
Summary progress:
Progress since last meeting:
1. Agency review of Prox-1 Physical Layer Pink Sheets completed.
2. Agency review of Prox-1 Data Link Layer Pink Sheets completed
3. Finalized pink sheets from WG Chairman for both documents to be given to the secretariat.
Problems and Issues: None. WG work completed upon release of new BB.
Prox-1 Evolution BOF under formulation
status: OK CAUTION PROBLEM
comment: Per charter
May 2004 12
SLS AREA REPORT
SUMMARY TECHNICAL STATUS
5. SLS- C&S WG
Goals:
- Develop recommended coding schemes with high power and spectral efficiency, with low decoding complexity.
- LDPCC Orange Book
Working Status: Active _X__ Idle ____
Summary progress:
Progress since last meeting: see next page.
Problems and Issues: see next page.
status: OK CAUTION PROBLEM
comment: No Consensus
May 2004 13
SLS AREA REPORT
OTHER ISSUES AND CONCERNS (1/2)
• Several technical contribution to this meeting (CNES, GSFC, ESOC/UniBo, ESTEC/Polito, JPL);
• Three Different proposals tabled
– NASA/GSFC Quasi-Cyclic LDPCC
– NASA/JPL Protograph LDPCC
– CNES support to DVB-S2 NO CONSENSUS
• Chair remark: WG not justified any more in such a case Migration to BOF or complete stop?
May 2004 14
SLS AREA REPORT
• Member Agencies recognize the difficult status without consensus and take proactive approach.
• Principle agreement for a set of “agreeable” codes reached.
• Codes shall be evaluated by BOF work and eventually generate consensus proposal for WG.
• Resolutions:
– C&S WG objectives redirected to solely produce/approve LDPCC Orange Book
– LDPCC BOF creation.
OTHER ISSUES AND CONCERNS (2/2)
May 2004 15
SLS AREA REPORT
OBJECTIVES & SCHEDULE OF LDPCC BOF
1. Identify requirements.
2. Define a Benchmark Matrix.
By Fall 2004
3. Identify a set of Quasi-Cyclic LDPCC for frames of (approx) 8 & 16k bits (desirable 32k).
4. Select the proposed family by proper benchmarking.
By Spring 2005 (Initial results)
By Fall 2005 (Finalized results)
ACTIONS
1. Update SLS-C&S charter
2. Produce SLS-LDPCC BOF charter
May 2004 16
SLS AREA REPORT
SUMMARY TECHNICAL STATUS
6. SLS- TCC WG
Goal: Develop a Telecommand Channel Coding Green Book.
Working Status: Active ___ Idle _X___
Summary progress:
Progress since last meeting: ESA informed that resources can be committed to lead the work.
Problems and Issues: NASA informed that complementary resources may be available. This is to be confirmed. Work can only start when both resources are confirmed.
status: OK CAUTION PROBLEM
comment: Resources
May 2004 17
SLS AREA REPORT
SUMMARY TECHNICAL STATUS7. SLS- LEC BOF
Goal: Make, if conclusive, a proposal for the creation of a WG on application of long erasure-correction codes.
Working Status: Active _X__ Idle ____
Summary progress:
Progress since last meeting: Input provided by ESA/ESOC/UniBO. ESA/ESOC and NASA/JPL ready to collaborate.
Problems and Issues:
• New task for Transfer Frames Loss statistics.
• Invitation for other CCSDS Areas (e.g. Systems Engineering) may be useful in Fall 2004 Meeting.
status: OK CAUTION PROBLEM
comment: As per updated charter
New task & schedule
Resources in 2005
May 2004 18
SLS AREA REPORT
SUMMARY TECHNICAL STATUS
8. SLS-DC WG
Goal : specify an image compression algorithm fulfilling identified space mission requirements
Working Status: Active _X_ Idle ____
Summary progress:
Progress since last meeting : specification brought to a “near” red book status (spring meeting taking place 17-19 may)
Problems and Issues : develop an open source reference software from source code provided by agencies : IPR issues
status: OK CAUTION PROBLEM
comment: Proceeding according to charter with approx. 6 months delay
May 2004 19
SLS AREA REPORT
• Finalize coding and formating details according to trade-offs results and performances analysis (only minor algorithmic features are still pending)
• Review white book and update according to decisions made at meeting, with the objective of outputting red-1 within 1 month after meeting.
• Review simulation softwares development status :
• 3 independent softwares
• Check compliance with final white book
• Initiate development of reference software, whose objectives are :
• Enable “prospect” missions teams to evaluate CCSDS algorithm performances for real mission data
• Later, to enable implementation compliance with published recommendation
OBJECTIVES OF SPRING (ON-GOING) MEETING
May 2004 20
SLS AREA REPORT
NONE
CROSS-AREA TECHNICAL ISSUES
May 2004 21
SLS AREA REPORT
OTHER ISSUES AND CONCERNS
A. Production and distribution of open source reference software for :
algorithm performance simulation
Implementation conformance verification
Will be assembled from source codes provided by various agencies
IPR issues :
• should be resolved by generic software license produced by CNES in the frame of this WG.
• License already used between NASA and CNES for source code exchange needed to assemble one of the simulation software presently used for algorithm development and specification cross-checking
May 2004 22
SLS AREA REPORT
OTHER ISSUES AND CONCERNS
B. Resources needed for green book production :
Objective is to output green book together with blue book
Resources availability still questionable to match this timing objectives.
May 2004 23
SLS AREA REPORT
PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC APPROVAL
RESOLUTION 1 (to come)
Pending successful completion of spring meeting objectives, WG will likely propose resolution for :
• Upgrading “image compression white book” to red-1 status
May 2004 24
SLS AREA REPORT
PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC APPROVAL
RESOLUTION 1 (from SLS-RFM) RFM WG resolves to submit editorially updated recommendations to CCSDS Editor via SLS AD for incorporation into 401;
RESOLUTION 2 (from SLS-RFM)RFM WG resolves to submit Pink Sheet 2.4.10 for Agency Review via SLS AD
RESOLUTION 3 (from SLS-RNG)RNG WG resolves to submit Pink Sheet 2.5.6B for Agency Review
RESOLUTION 4 (from SLS-Prox-1-Build-2)Prox-1-Build-2 WG resolves to submit final pink sheets to CESG of Prox-1 Data Link Layer and Prox-1 Physical Layer in order to reissue new versions of these blue books
May 2004 25
SLS AREA REPORT
PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC APPROVAL
RESOLUTION 5 (from SLS-SLP) SLP WG resolves to submit Encapsulation Service as RED-2 for Agency Review via SLS AD
RESOLUTION 6 (from SLS-SLP)SLP WG resolves to submit Pink Sheets to AOS Space Data Link Protocol for Agency Review via SLS AD (Pink Sheets available end June)
RESOLUTION 7 (from SLS-C&S) C&S WG resolves to submit proposal for redirection of C&S WG objectives to solely produce/approve LDPCC Orange Book via SLS AD
