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SLS AREA REPORT November 2004

SLS AREA REPORT November 2004. SLS AREA REPORT. CONTENTS. CURRENTLY ACTIVE WGs AND BOFs WITHIN AREA SUMMARY TECHNICAL STATUS OF EACH WG & BOF CROSS-AREA TECHNICAL ISSUES OTHER ISSUE AND CONCERNS PROPOSED AREA RESOLUTIONS/ACTION ITEMS. SLS AREA REPORT.

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SLS AREA REPORT November 2004

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  1. SLS AREAREPORT November 2004

  2. SLS AREA REPORT CONTENTS • CURRENTLY ACTIVE WGs AND BOFs WITHIN AREA • SUMMARY TECHNICAL STATUS OF EACH WG & BOF • CROSS-AREA TECHNICAL ISSUES • OTHER ISSUE AND CONCERNS • PROPOSED AREA RESOLUTIONS/ACTION ITEMS

  3. SLS AREA REPORT • LIST OF CURRENT WGs AND BOFs WITHIN AREA • SLS-RFM - RF & Modulation WG • SLS-C&S – Coding & Synchronisation WG • SLS-DC – Data Compression WG • SLS-SLP – Space Link Protocols WG • SLS-TCC – Telecommand Channel Coding WG • SLS-RNG – Ranging WG • SLS-Prox-1 Build-2 WG • SLS-LEC - Long Erasure Codes BOF • SLS-LDPC - New Codes BOF

  4. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS-RFM WG • Goal: align 401.0-B with WRC-03, SFCG-23 and SFCG-24 • Working Group Status: Active • Working Group Summary Situation: • Working Group Summary progress: • Agreed way forward to resolve deadlock on recommendation 2.4.18 found. White 2.4.18 drafted in accordance with SFCG 14-3R6 to remain white until after SFCG-25 meeting in October 2005;

  5. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS-RFM WG • Working Group Summary progress: • small number of revised recommendations expected in Spring 2005, following on-going simulation results and joint RFM-C&S WGs meeting. • Problems and Issues: • Requirement to await SFCG-25 completion before finalizing white 2.4.18 to avoid same problems of current 2.4.18  need to delay WG termination date from August 2005 to end of November 2005. SLS-RFM WG Fall-05 meeting to be planned Nov’05 (after SFCG-25) • Green Book containing Earth station characteristics (411.0-G-3) will not be maintained any longer. To be taken over by IOAG or ECSS.

  6. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS-C&S: Coding & Synchronization WG (1) • Goal: - Issue TM Channel Coding GB • Working Group Status: Active • Working Group Summary Situation: • Working Group Summary progress:

  7. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS-C&S: Coding & Synchronization WG (2) • Problems and Issues: • Telemetry Channel Coding Green Book could not be published for reasons of formating problems (see D. Other Issues & Concerns, Issue 1) • Scope of the Orange Book • WG mainly discussed the Orange Book as per MoMs held at University of Maryland. • WG is still awaiting NASA’s reply to CMC-S04-A25 to proceed (or not) with the Orange Book .

  8. SLS AREA REPORT • 3. Data compression WG • Goal: • Specify an image compression algorithm fulfilling identified space mission requirements • Develop a subsequent recommendation together with the supporting information (performances, usage, reference software, etc …). • Working Group Status: Active • Working Group Summary Situation: • Charter has been updated

  9. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • 4. SLS-SLP WG • Goal: - Adapt, Adopt, and Create link layer Protocols for space data systems - Develop Link Layer Green Books for CCSDS Link Layer Protocols • Working Group Status: Active • Working Group Summary Situation: • Working Group Summary progress: • Produced Pink Sheet to Space Link Identifiers Blue Book to add Prox-1 Port ID Values. Submitted to secretariat for agency review. • Reviewing the Draft Proximity-1 Space Link Protocol GB. • Recommend that the Secretariat publish the Space Link Protocols GB and the Space Data Link Protocol GB. Submitted to secretariat for publishing on web site.

  10. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • 4. SLS-SLP WG • Problems and Issues: • Pink sheets for AOS Link Layer Protocol (increase in AOS frame sequence count) approved for release by CMC (Spring’04) but still not published for agency review. • RED-2 Version of Encapsulation Packet Service approved by CESG (Spring’04) submitted again to secretariat for agency review

  11. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS-TCC: Telecommand Channel Coding WG • Goal: Development of a Telecommand Channel Coding Green Book. • Working Group Status: Active • Working Group Summary Situation: • Working Group Summary progress: • First Draft Book delivered by ESA Editor for commenting within the WG. Under WG review.

  12. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • RNG WG • Goal: issue blue book on novel ranging techniques • Working Group Status: Active • Working Group Summary Situation: • Working Group Summary progress: • Agency review on delta-DOR recommendation completed; • Independent theoretical analysis and simulation results on most regenerative PN ranging specs available from two Agencies; • Four (+one) different ranging schemes identified as possible candidates for regeneration;

  13. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • 6. RNG WG • Working Group Summary progress (cont.): • Preliminary hardware results on a subset of the four options available from one Agency; • White book (Issue 1) to be issued by July 2005 is being written with focus on regenerative PN codes; • Transparent PN codes will be addressed after WB issue 1 is out. • Simulation work initiated with one agency. • Problems and Issues: • None so far.

  14. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • 7. Prox-1-Build-2 WG • Goal: Update the Proximity-1 Space Link (3) books to be in sync with the first generation of Prox-1 spacecraft • Working Group Status: Active • Working Group Summary Situation: • The only remaining item in this WG, is to resolve the following physical layer requirements: 1) data rate offset, 2) short term data rate stability, 3) long term data rate stability. • Working Group Summary progress: • Pink Sheets created for Prox-1 Physical Layer BB to cover those three requirements above. Submitted to secretariat for agency review. • Problems and Issues: • None

  15. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS-LEC: Long Erasure Codes (‘tornado codes’) BOF • Goal: Make, if conclusive, a proposal for the creation of a WG on application of long erasure-correction codes. • Working Group Status: Active • Working Group Summary Situation: • Working Group Summary progress: • Restart expected by April’05 • Problems and Issues: • NASA/JPL did not contribute to this meeting (because of – now solved- funding issues) but report readiness to collaborate for Spring 2005 Meeting.

  16. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS- LDPCC: New CodesBOF (part 1) • Goal: Identify Requirements for future codes and possibly select a family of Codes according to identified requirements. • Working Group Status: Active • Working Group Summary Situation:

  17. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • SLS- LDPCC: New Codes BOF • Plan of Action Decided at SLS Plenary (1): • The discussion highlighted the need of identifying and approving requirements in stronger and more formal way. • ESA/ESOC/UniBO is leading the Editing work for a Requirements and Evaluation Criteria Document (RECD) (with weighting factor) for approval by Agencies. RECD will include rationale for each requirement. • 1st issue RECD shall be distributed by 10 January 2005. It shall provide a preliminary list of requirements/rationale and evaluation criteria for at least 3 application profiles: High rate EES TM, Deep space TM and Near Earth science TM. • Comments to 1st issue RECD by email by 31 January 2005. Telecon if necessary. • 2nd issue RECD distributed 15 Feb • Comments to 2nd issue RECD 15 March – any later comment will be discarded. (Agencies will be asked to “sign up” or ‘deny” individual items by e-mail revision/discussion by 15 March 2005). • 3rd (tentative final) issue RECD distributed 25 March

  18. SLS AREA REPORT • SUMMARY TECHNICAL STATUS • 9. SLS- LDPCC: New Codes CodesBOF (part 4) • Plan of Action Decided at SLS Plenary (2): • SLS-LDPCC Spring 2005 Meeting (11..15 April 2005) will be dedicated to addressing not closed comments to 2nd issue and finalising the RECD. • Approval of RECD by agencies subsequent to Spring’05 meeting. • Upon approval of RECD, agencies will be invited to submit proposals (codes) together with compliance matrix to RECD. • Codes proposals to be discussed at Fall’05 meeting

  19. SLS AREA REPORT • CROSS-AREA TECHNICAL ISSUES • Secure CommunicationsJoint SLS Area – Security WG planned for April meeting (pending schedule compatibility)

  20. SLS AREA REPORT • OTHER ISSUES AND CONCERNS Nothing to report

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