1. SLS AREA REPORT May 20041 SLS AREA REPORT CESG MEETING Montreal, 17 May 2004 CONSULTATIVE COMMITTEE FOR SPACE DATA SYSTEMS

2. SLS AREA REPORT May 20042 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

3. SLS AREA REPORT May 20043 1.SLS-RFM WGRadio Frequency & Modulation 2.SLS-RNG WGRanging 3.SLS-SLP WGSpace Link Protocols 4.SLS-PROX1-BUILD2 WGProximity-1 Build-2 5.SLS-C&S WGCoding & Synchronisation 6.SLS-TCC WGTelemetry Channel Coding 7.SLS-LEC BOFLong Erasure Codes 8.SLS-DCData Compression LIST OF CURRENT WGs AND BOFs

4. SLS AREA REPORT May 20044 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:OKCAUTIONPROBLEM comment:As per charter ……except rec 2.4.18

5. SLS AREA REPORT May 20045 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

6. SLS AREA REPORT May 20046 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

7. SLS AREA REPORT May 20047 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:OKCAUTIONPROBLEM comment:As per charter

8. SLS AREA REPORT May 20048 SUMMARY TECHNICAL STATUS 3.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:OKCAUTIONPROBLEM comment:Per updated Charter

9. SLS AREA REPORT May 20049 CROSS-AREA TECHNICAL ISSUES None

10. SLS AREA REPORT May 200410 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.

11. SLS AREA REPORT May 200411 SUMMARY TECHNICAL STATUS 4.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:OKCAUTIONPROBLEM comment:Per charter

12. SLS AREA REPORT May 200412 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:OKCAUTIONPROBLEM comment:No Consensus

13. SLS AREA REPORT May 200413 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?

14. SLS AREA REPORT May 200414 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)

15. SLS AREA REPORT May 200415 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

16. SLS AREA REPORT May 200416 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:OKCAUTIONPROBLEM comment:Resources

17. SLS AREA REPORT May 200417 SUMMARY TECHNICAL STATUS 7.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:OKCAUTIONPROBLEM comment: As per updated charter New task & schedule Resources in 2005

18. SLS AREA REPORT May 200418 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:OKCAUTIONPROBLEM comment: Proceeding according to charter with approx. 6 months delay

19. SLS AREA REPORT May 200419 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

20. SLS AREA REPORT May 200420 NONE CROSS-AREA TECHNICAL ISSUES

21. SLS AREA REPORT May 200421 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

22. SLS AREA REPORT May 200422 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.

23. SLS AREA REPORT May 200423 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

24. SLS AREA REPORT May 200424 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

25. SLS AREA REPORT May 200425 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