CESG Report

1
SLS AREA REPORT November 2004
2
SLS AREA REPORT
CONTENTS

1. CURRENTLY ACTIVE WGs AND BOFs WITHIN AREA
2. SUMMARY TECHNICAL STATUS OF EACH WG BOF
3. CROSS-AREA TECHNICAL ISSUES
4. OTHER ISSUE AND CONCERNS
5. PROPOSED AREA RESOLUTIONS/ACTION ITEMS

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SLS AREA REPORT

1. LIST OF CURRENT WGs AND BOFs WITHIN AREA

• SLS-RFM - RF Modulation WG
• SLS-CS 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

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SLS AREA REPORT

1. 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
• 13 revised recs 2 editorial recs generated in
  October
• Agency review on 24 recommendations completed 1st
  Dec
• 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

status OK CAUTION PROBLEM
comment Good progress
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SLS AREA REPORT

1. 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-CS 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.
• Green Book containing Earth station
  characteristics (411.0-G-3) dated May 1997 does
  not reflect current capabilities and may mislead
  users. Updating it is a difficult and
  time-consuming job requiring a senior person with
  intimate technical knowledge of Earth station
  equipment design. NASA/JPL maintained it in the
  past.

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SLS AREA REPORT

1. SUMMARY TECHNICAL STATUS

• SLS-CS Coding Synchronization WG (1)
• Goal - Issue TM Channel Coding GB - Review
  and issue an Orange Book on NASA experience with
  Low Density Parity Check Codes ASIC
  Development.
• Working Group Status Active
• Working Group Summary Situation
• Working Group Summary progress
• Draft Book delivered by NASA/GSFC.

status OK CAUTION PROBLEM
comment Scope of the Orange Book undefined
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SLS AREA REPORT

1. SUMMARY TECHNICAL STATUS

• SLS-CS 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 awaiting NASAs reply to CMC-S04-A25 to
  proceed (or not) with the Orange Book .

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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

status OK CAUTION PROBLEM
comment Red-1 under review, green book work in progress
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SLS AREA REPORT

• Data compression WG (cntd)
• Working Group Summary progress
• Red book issue 1 has been finalized all
  pending algorithmic details have been decided
  upon
• Red-1 under review till dec. 1st, first RIDs
  received were disposed of at this meeting
• Green book is being assembled editing
  leadership has been splitted among WG members
  target BB GB available at the same date (cf.
  planning)
• Cross verification of recommendation being done
  through 4 independent SW implementations 1 HW
  implementation
• One of these will be chosen as reference
  software, needed for
• - compliance testing, performance evaluation.

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SLS AREA REPORT

• Data compression WG (cntd)
• Problems and Issues
• WG decides to strictly separate compression and
  data transport issues. Synchronization markers
  will not be provided by the compression rec.
  for bitstream oriented services, it will be up to
  the users to insert synchronization marker
  aligned with each compressed segment.
• reference software should be part of the final
  recommendation, therefore it is desirable that it
  is available from the CCSDS website together with
  the BB, as an open source software with
  appropriate S/W license.

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SLS AREA REPORT

• Data compression WG (cntd)
• Revised planning
• Complete GREEN BOOK draft March, 2005
• Complete S/W cross-verification March, 2005
• Dispose RED BOOK-1 RIDS, Apr, 2005
• Issue RED BOOK-2, July, 2005
• Release reference S/W, October, 2005
• Issue GREEN BOOK, October, 2005
• Issue BLUE BOOK, October, 2005

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SLS AREA REPORT

1. 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
• 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

status OK CAUTION PROBLEM
comment Work in progress
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SLS AREA REPORT

1. 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 (Spring04) but still not published for
  agency review.
• RED-2 Version of Encapsulation Packet Service
  approved by CESG (Spring04) but no CMC decision.

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SLS AREA REPORT

1. 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.

status OK CAUTION PROBLEM
comment WG restarted with ESA resources NASA contribution.
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SLS AREA REPORT

1. 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

status OK CAUTION PROBLEM
comment Good progress
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SLS AREA REPORT

1. 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.
• Problems and Issues
• None so far.

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SLS AREA REPORT

1. 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.
• Problems and Issues
• None

status OK CAUTION PROBLEM
comment Work in progress
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SLS AREA REPORT

1. 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
• Input provided by ESA/ESOC/UniBO.
• 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.

status OK CAUTION PROBLEM
comment ESA/UniBO work in progress NASA/JPL contribution on hold
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SLS AREA REPORT

1. SUMMARY TECHNICAL STATUS

• SLS- LDPCC New Codes BOF (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

status OK CAUTION PROBLEM
comment Identification agreement on requirements still slow and difficult Proposals still diverging in approach wrt to tentative requirements from Spring04
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SLS AREA REPORT

1. SUMMARY TECHNICAL STATUS

• 9. SLS- LDPCC New Codes BOF (part 2)
• Working Group Summary progress
• Valuable input on requirements provided at this
  meeting.
• New input on possible candidate codes provided at
  this meeting.
• Problems and Issues
• Extremely limited interaction between meetings
  likely to delay convergence of the work.
• Identification of requirements and evaluation
  criteria still variegated and needing
  harmonization in single document to be possibly
  approved by all members.
• Possible debate on some requirements can be
  anticipated.
• Codes proposed by members for standardization
  and/or reference still missing an harmonized
  approach.

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SLS AREA REPORT

1. SUMMARY TECHNICAL STATUS

• 9. SLS- LDPCC New Codes BOF (part 3)
• 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

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SLS AREA REPORT

1. SUMMARY TECHNICAL STATUS

• 9. SLS- LDPCC New Codes Codes BOF (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
  Spring05 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 Fall05 meeting

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SLS AREA REPORT

1. CROSS-AREA TECHNICAL ISSUES

• Issue 1 Secure CommunicationsJoint SLS Area
  Security WG held 18 November
• SLS Area work in the domain of security to start
  once needs are established
• Careful security analysis is needed prior to
  adopting recommendations with high cost impact
• Two resolutions
• Res Need for agencies interoperability needs on
  security measures to be confirmed
• Res Need for regular SLS Security WG meetings

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SLS AREA REPORT

1. OTHER ISSUES AND CONCERNS

1. Issue 1 Secretarial Support SLS-DCEditorial
   support for producing books could be improved.
   Data Compression Red Book did not get any support
   for edition of technical material (e.g. graphics,
   equations, italicised symbols, numbering of
   paragraphs, )SLS-RFMPink sheets were not
   posted but mailed in corrupted file. Review
   closing date had to be extended.SLS-CSBTAS
   having problems with exotic formats used by
   Coding people (i.e. Latex editor, eps pictures,
   etc.). TM Channel Coding GB could not be
   published.SLS-SLPPink sheets for AOS Link Layer
   Protocol approved for agency review by CMC at
   Spring04 meeting still not published

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 1 SLS-RFM-R-0410-001
• Considering that
• The following 23 editorially revised
  recommendations were subject to Agency review
  2.1.8B, 2.2.4, 2.2.6, 2.3.3A, 2.4.6, 2.4.7,
  2.4.9, 2.4.14A, 2.4.14B, 2.4.15A. 2.4.15B,
  2.4.16, 3.1.1, 3.1.6B, 3.2.1A, 3.3.1, 3.3.2A,
  3.6.2A, 4.1.5, 4.2.1, 4.2.2, 4.2.3 and 5.1.
• And recognizing that
• No RIDs were received during the first review
  period
• Review was extended until 1st Dec upon request
  from one agency
• The SLS Area resolves that
• Upon closure of review and disposition of Rids,
  these 23 recommendations be raised to blue status
  and inserted in 401-0
• ACTION ITEM 1 SLS-RFM-A-0410-001
• Upon closure of review and disposition of Rids,
  SLS AD to request CESG/CMC to approve insertion
  of the 23 above mentioned editorially revised
  recommendations in blue book 401-0 January 2005

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 2 SLS-RFM-R-0410-002
• Considering that
• Revised recommendation 2.4.10 was subject to
  Agency review
• And recognizing that
• One RID was received during the review period,
  discussed during the Fall 2004 meeting, and
  disposed of
• Review was extended until 1st Dec upon request of
  one agency
• The SLS Area resolves that
• Upon closure of review and disposition of Rids,
  revised recommendation 2.4.10 be raised to blue
  status and inserted in 401-0
• ACTION ITEM 2 SLS-RFM-A-0410-002
• Upon closure of review and disposition of Rids,
  SLS AD to request CESG/CMC to approve insertion
  of revised recommendation 2.4.10 into blue book
  401-0. January 2005

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 3 SLS-RFM-R-0410-003
• Considering that
• The following 13 revised recommendations were
  agreed upon during the Fall 2004 meeting 2.1.3B,
  2.1.4B, 2.1.7B, 2.3.2, 2.3.3A, 2.3.3B, 2.3.4A,
  2.3.4B, 2.4.6, 2.4.14B, 2.4.17B, 3.1.2B, 3.3.3A.
• And recognizing that
• Proposed revisions are to bring such old
  recommendations in line with current CCSDS
  agencies practice
• The SLS Area resolves that
• these 13 recommendations be raised to pink
  status and be submitted for Agency review
• ACTION ITEM 3 SLS-RFM-A-0410-003
• CESG/CMC to approve initiation of Agency review
  for the above mentioned 13 revised
  recommendations Dec 2004
• ACTION ITEM 4 SLS-RFM-A-0410-004
• CCSDS secretariat to issue the 13 pink sheets for
  agency review 15 Jan 2005

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 4 SLS-RFM-R-0410-004
• Considering that
• Minor editorial changes to recommendations 2.4.2
  and 2.3.5 were agreed upon during the Fall 2004
  meeting.
• And recognizing that
• Submitting editorial changes to Agency review is
  an unnecessary waste of already constrained
  Agency resources
• The SLS Area resolves that
• editorially revised recommendations 2.4.2 and
  2.3.5 be raised to blue status and inserted in
  401-0
• ACTION ITEM 5 SLS-RFM-A-0410-005
• CESG/CMC to approve direct insertion of the 2
  above mentioned editorially revised
  recommendations in blue book 401-0 Dec 2004
• ACTION ITEM 6 SLS-RFM-A-0410-006
• CCSDS secretariat to insert recs 2.4.2 and 2.3.5
  into book 401-0 15 Jan 2005

29
SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 5 SLS-RFM-R-0410-005
• Considering that
• The Green Book containing Earth station
  characteristics (411.0-G-3) dated May 1997 does
  not reflect current capabilities and may mislead
  users.
• The document represents a resource used by many
  organizations planning new missions. In the
  past, NASA/JPL provided the book captain function
  and would consider doing so again, provided that
  the necessary funds were made available.
• The SLS Area resolves that
• CESG/CMC be alerted about status of 411.0-G-3
  so that necessary resources are made available
  within an organization to update it.
• ACTION ITEM 7 SLS-RFM-A-0410-007
• CESG/CMC to consider obtaining necessary
  resources within an appropriate organization to
  update 411.0-G. Dec 2004

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 6 SLS-RFM-R-0410-006
• Considering that
• A very difficult situation with recommendation
  2.4.18 is being solved by a white 2.4.18 written
  along the lines of SFCG recommendation 14-3R6
• Such SFCG rec is up for final approval at SFCG-25
  (October 2005)
• The activities of the RFM WG are due by August
  2005
• And recognizing that
• Present problems with current 2.4.18 are in the
  inconsistencies with SFCG which could be again
  the case with new white version
• The SLS Area resolves that
• the RFM WG schedule be extended until end of
  November 2005.
• ACTION ITEM 8 SLS-RFM-A-0410-008
• CESG/CMC to agree on RFM WG 3-months schedule
  extension.

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 7 SLS-DC-R-0411-001
• Considering that
• Reference software is essential to
• Enable prospect missions teams to evaluate
  CCSDS algorithm performances for real mission
  data
• Later, to enable implementation compliance with
  published recommendation
• And recognizing that
• Caution should be taken w.r.t. hosting on the
  CCSDS site software which are subject to IPR from
  a company
• The AREA resolves that
• Open source reference software be made available
  to users
• ACTION ITEM 9 SLS-DC-A-0411-001
• CESG to investigate hosting open-source reference
  software at CCSDS website but with license
  agreement with the software originator

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 8 SLS-DC-R-0411-002
• Considering that
• Data Compression Red Book is currently under
  review and Green Book under preparation
• And recognizing that
• Current charter foresees BB GB issued July 2004
• Reference software should be made available at
  the same time as BB and GB
• The AREA resolves that
• Data Compression WG charter be updated to
  reflect the actual plan
• ACTION ITEM 10 SLS-DC-A-0411-002
• CESG to update Data Compression WG operating plan
  based on the new schedule (plans) envisioned for
  completing RED-2, GREEN BOOK, BLUE BOOK and
  reference software.

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 9 SLS-RNG-R-0410-001
• Considering that
• Revised recommendation 2.5.6B was subject to
  Agency review
• No RIDs were received during the review period
• Revisions to 2.5.6B stem from current and future
  delta-DOR practices by ESA and NASA
• And recognizing that
• No other CCSDS Agencies are currently supporting
  delta-DOR activities
• The SLS Area resolves that
• revised rec 2.5.6B be raised to blue status and
  inserted in 401-0.
• ACTION ITEM 11 SLS-RNG-A-0410-001
• CESG/CMC to approve insertion of revised
  recommendation 2.5.6B in blue book 401-0 Dec
  2004.
• ACTION ITEM 12 SLS-RNG-A-0410-001
• CCSDS secretariat to insert rec 2.5.6B into book
  401-0 15 Jan 2005

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SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 10 SLS-SLP-R-0411-001
• Considering that
• HW commands, Packets, and user defined data will
  be interchanged between inter-agency spacecraft
  in proximity
• And recognizing that
• There is a need for a standardized way to route
  these data types between inter-agency spacecraft
  in proximity
• The SLS Area resolves that
• Pink Sheets to Space Link Identifiers BB be
  provided to add Prox-1 Port ID values for
  interoperability
• ACTION ITEM 13 SLS-SLP-A-0411-001
• CESG/CMC to approve the release of Pink Sheets
  for agency review Dec 2004
• ACTION ITEM 14 SLS-SLP-A-0411-002
• CCSDS Secretariat to issue Pink Sheets for agency
  review 31 Jan 2005

35
SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 11 SLS-Prox-1 Build2-R-0411-002
• Considering that
• Prox-1 Data Rate offset and short and long term
  rate stability requirements need to be addressed
  in the spec.
• And recognizing that
• Without such requirements, implementations may
  not be able to acquire at the specified Prox-1
  data rates
• The AREA resolves that
• Pink Sheets to Prox-1 Physical Layer BB be
  provided for Agency Review to address data rate
  offset and stability requirements.
• ACTION ITEM 15 SLS-Prox-1 Build2-A-0411-001
• CESG/CMC to approve the release of Pink Sheets
  for agency review Dec 2004
• ACTION ITEM 16 SLS-Prox-1 Build2-A-0411-002
• CCSDS Secretariat to issue Pink Sheets for agency
  review 31 Jan 2005

36
SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 12 SLS-SLP-R-0411-003
• Considering that
• Both the Space Link Protocols GB and the Space
  Data Link Protocols GB have completed an informal
  Agency Review (been on the CCSDS web site for
  months)
• And recognizing that
• There are no constraints against their
  publication
• The AREA resolves that
• Final Green books be provided to the CCSDS
  Secretariat for inclusion onto the CCSDS Web
  Site.
• ACTION ITEM 17 SLS-SLP-A-0411-002
• Takahiro Yamada to provide both GBs to SLS-SLP WG
  chair by Dec. 15, 2004
• ACTION ITEM 18 SLS-SLP-A-0411-003 CESG to
  approve the release of the 2 GBs Dec 2004
• ACTION ITEM 19 SLS-SLP-A-0411-004 CCSDS
  Secretariat to publish the GBs 31 Jan 2005

37
SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 13 SLS-R-0410-001
• Considering that
• Agencies are currently working on security
  measures for implementation in future space coms
  systems
• The Security WG is developing a GB on security
  measures and prepares to produce recommendations
• And recognizing that
• Not all measures may need to be the object of
  interoperability
• The SLS Area resolves that
• interoperability needs on security measures
  (encryption, authentication, key management) be
  confirmed
• ACTION ITEM 20 SLS-A-0410-001
• CESG/CMC to establish a policy on whether a
  common set of security measures should be
  included in the CCSDS interoperability work Dec
  2004

38
SLS AREA REPORT

1. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC
   APPROVAL

• RESOLUTION 14 SLS-R-0410-002
• Considering that
• The Security WG is developing a GB on security
  measures and prepares to produce recommendations
• Security measures may affect all layers of the
  stack
• And recognizing that
• The Security WG needs the expert support from the
  SLS Area
• The SLS Area resolves that
• joint SLS Area Security WG meetings be held
  on a regular basis
• ACTION ITEM 21 SLS-A-0410-002
• SLS AD and SE AD to agree on regular SLS
  Security meetings Nov 2004