November 20041 SLS AREA REPORT November 2004. 2 SLS AREA REPORT CONTENTS A.CURRENTLY ACTIVE WGs AND BOFs WITHIN AREA B.SUMMARY TECHNICAL STATUS OF EACH

November 2004 1

SLS

AREA REPORT

November 2004

November 2004 2

SLS AREA REPORT

CONTENTS

A. CURRENTLY ACTIVE WGs AND BOFs WITHIN AREA

B. SUMMARY TECHNICAL STATUS OF EACH WG & BOF

C. CROSS-AREA TECHNICAL ISSUES

D. OTHER ISSUE AND CONCERNS

E. PROPOSED AREA RESOLUTIONS/ACTION ITEMS

November 2004 3

1. SLS-RFM - RF & Modulation WG

2. SLS-C&S – Coding & Synchronisation WG

3. SLS-DC – Data Compression WG

4. SLS-SLP – Space Link Protocols WG

5. SLS-TCC – Telecommand Channel Coding WG

6. SLS-RNG – Ranging WG

7. SLS-Prox-1 Build-2 WG

8. SLS-LEC - Long Erasure Codes BOF

9. SLS-LDPC - New Codes BOF

A. LIST OF CURRENT WGs AND BOFs WITHIN AREA

SLS AREA REPORT

November 2004 4

B. SUMMARY TECHNICAL STATUS1. 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

SLS AREA REPORT

November 2004 5

B. SUMMARY TECHNICAL STATUS1. SLS-RFM WG


• 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.

• 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.

SLS AREA REPORT

November 2004 6

B. SUMMARY TECHNICAL STATUS2. SLS-C&S: 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.




• Draft Book delivered by NASA/GSFC.


comment: Scope of the Orange Book undefined

SLS AREA REPORT

November 2004 7

B. SUMMARY TECHNICAL STATUS2. SLS-C&S: Coding & Synchronization WG (2)


• 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 NASA’s reply to CMC-S04-A25 to proceed (or not) with the Orange Book .

SLS AREA REPORT

November 2004 8

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 …).




comment: Red-1 under review, green book : work in progress

SLS AREA REPORT

November 2004 9

Data compression WG (cnt’d)


• 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.

SLS AREA REPORT

November 2004 10



• 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.

SLS AREA REPORT

November 2004 11


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

SLS AREA REPORT

November 2004 12

B. SUMMARY TECHNICAL STATUS4. 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




• 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


comment: Work in progress

SLS AREA REPORT

November 2004 13

B. SUMMARY TECHNICAL STATUS4. SLS-SLP WG


• 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) but no CMC decision.

SLS AREA REPORT

November 2004 14

B. SUMMARY TECHNICAL STATUS5. SLS-TCC: Telecommand Channel Coding WG

Goal: Development of a Telecommand Channel Coding Green Book.




• First Draft Book delivered by ESA Editor for commenting within the WG.


comment: WG restarted with ESA resources & NASA contribution.

SLS AREA REPORT

November 2004 15

B. SUMMARY TECHNICAL STATUS6. RNG WG

Goal: issue blue book on novel ranging techniques




• 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;


comment: Good progress

SLS AREA REPORT

November 2004 16

B. SUMMARY TECHNICAL STATUS6. 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.


• None so far.

SLS AREA REPORT

November 2004 17

B. SUMMARY TECHNICAL STATUS7. 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 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.


• Pink Sheets created for Prox-1 Physical Layer BB to cover those three requirements above.


• None


comment: Work in progress

SLS AREA REPORT

November 2004 18

B. SUMMARY TECHNICAL STATUS8. 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.




• Input provided by ESA/ESOC/UniBO.


• NASA/JPL did not contribute to this meeting (because of – now solved- funding issues) but report readiness to collaborate for Spring 2005 Meeting.


comment: ESA/UniBO work in progress

NASA/JPL contribution on hold

SLS AREA REPORT

November 2004 19

B. SUMMARY TECHNICAL STATUS9. SLS- LDPCC: New Codes BOF (part 1)

Goal: Identify Requirements for future codes and possibly select a family of Codes according to identified requirements.




comment: Identification & agreement on requirements still slow and difficult

Proposals still diverging in approach wrt to tentative requirements from Spring‘04

SLS AREA REPORT

November 2004 20



• Valuable input on requirements provided at this meeting.

• New input on possible candidate codes provided at this meeting.


• 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.

SLS AREA REPORT

November 2004 21


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

SLS AREA REPORT

November 2004 22

B. SUMMARY TECHNICAL STATUS9. 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 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

SLS AREA REPORT

November 2004 23

A. Issue 1 Secure Communications

Joint 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

C. CROSS-AREA TECHNICAL ISSUES

SLS AREA REPORT

November 2004 24

D. OTHER ISSUES AND CONCERNS

A. 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-C&SBTAS 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 Spring’04 meeting still not published

SLS AREA REPORT

November 2004 25

E. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC APPROVAL

RESOLUTION 1 : SLS-RFM-R-0410-001

Considering that:1. 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:1. No RIDs were received during the first review period

2. 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-0410-001Upon 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]

SLS AREA REPORT

November 2004 26



Considering that:1. Revised recommendation 2.4.10 was subject to Agency review;

And recognizing that:1. One RID was received during the review period, discussed during the Fall

2004 meeting, and disposed of

2. Review was extended until 1st Dec upon request of one agency


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-0410-002Upon 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]

SLS AREA REPORT

November 2004 27



Considering that:1. 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:1. Proposed revisions are to bring such ‘old’ recommendations in line with

current CCSDS agencies’ practice


these 13 recommendations be raised to pink status and be submitted for Agency review

ACTION ITEM 3: SLS-RFM-A-0410-003CESG/CMC to approve initiation of Agency review for the above mentioned 13

revised recommendations [Dec 2004]

ACTION ITEM 4: SLS-RFM-A-0410-004CCSDS secretariat to issue the 13 pink sheets for agency review [15 Jan 2005]

SLS AREA REPORT

November 2004 28



Considering that:1. Minor editorial changes to recommendations 2.4.2 and 2.3.5 were agreed

upon during the Fall 2004 meeting.

And recognizing that:1. Submitting editorial changes to Agency review is an unnecessary waste

of already constrained Agency resources


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-0410-005CESG/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-0410-006CCSDS secretariat to insert recs 2.4.2 and 2.3.5 into book 401-0 [15 Jan 2005]

SLS AREA REPORT

November 2004 29



Considering that:1. The Green Book containing Earth station characteristics (411.0-G-3)

dated May 1997 does not reflect current capabilities and may mislead users.

2. 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.


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-0410-007CESG/CMC to consider obtaining necessary resources within an appropriate

organization to update 411.0-G. [Dec 2004]

SLS AREA REPORT

November 2004 30

E. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC APPROVALRESOLUTION 6 : SLS-RFM-R-0410-006

Considering that:1. 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;

2. Such SFCG rec is up for final approval at SFCG-25 (October 2005);

3. The activities of the RFM WG are due by August 2005

And recognizing that:1. Present problems with current 2.4.18 are in the inconsistencies with

SFCG which could be again the case with new white version


the RFM WG schedule be extended until end of November 2005.

ACTION ITEM 8: SLS-RFM-A-0410-008CESG/CMC to agree on RFM WG 3-months schedule extension.

SLS AREA REPORT

November 2004 31


RESOLUTION 7 : SLS-DC-R-0411-001

Considering that:1. 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:1. 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

SLS AREA REPORT

November 2004 32


RESOLUTION 8 : SLS-DC-R-0411-002

Considering that:1. Data Compression Red Book is currently under review and Green Book

under preparation

And recognizing that:1. Current charter foresees BB & GB issued July 2004

2. Reference software should be made available at the same time as BB and GB


Data Compression WG charter be updated to reflect the actual plan

ACTION ITEM 10: SLS-DC-A-0411-002CESG 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.

SLS AREA REPORT

November 2004 33


RESOLUTION 9 : SLS-RNG-R-0410-001

Considering that:1. Revised recommendation 2.5.6B was subject to Agency review;

2. No RIDs were received during the review period;

3. Revisions to 2.5.6B stem from current and future delta-DOR practices by ESA and NASA

And recognizing that:1. No other CCSDS Agencies are currently supporting delta-DOR activities


revised rec 2.5.6B be raised to blue status and inserted in 401-0.

ACTION ITEM 11: SLS-RNG-A-0410-001CESG/CMC to approve insertion of revised recommendation 2.5.6B in blue book

401-0 [Dec 2004].

ACTION ITEM 12: SLS-RNG-A-0410-001CCSDS secretariat to insert rec 2.5.6B into book 401-0 [15 Jan 2005]

SLS AREA REPORT

November 2004 34

E. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC APPROVALRESOLUTION 10: SLS-SLP-R-0411-001

Considering that:1. HW commands, Packets, and user defined data will be interchanged

between inter-agency spacecraft in proximity

And recognizing that:1. There is a need for a standardized way to route these data types

between inter-agency spacecraft in proximity


Pink Sheets to Space Link Identifiers BB be provided to add Prox-1 Port ID values for interoperability

ACTION ITEM 13: SLS-SLP-A-0411-001CESG/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]

SLS AREA REPORT

November 2004 35

E. PROPOSED RESOLUTIONS AND ACTIONS FOR CESG/CMC APPROVALRESOLUTION 11: SLS-Prox-1 Build2-R-0411-002

Considering that:1. Prox-1 Data Rate offset and short and long term rate stability

requirements need to be addressed in the spec.

And recognizing that:1. Without such requirements, implementations may not be able to acquire

at the specified Prox-1 data rates


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-0411-001CESG/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]

SLS AREA REPORT

November 2004 36


RESOLUTION 12 : SLS-SLP-R-0411-003

Considering that:1. 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:1. There are no constraints against their publication


Final Green books be provided to the CCSDS Secretariat for inclusion onto the CCSDS Web Site.

ACTION ITEM 17: SLS-SLP-A-0411-002Takahiro 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]

SLS AREA REPORT

November 2004 37


RESOLUTION 13 : SLS-R-0410-001

Considering that:1. Agencies are currently working on security measures for

implementation in future space coms systems;

2. The Security WG is developing a GB on security measures and prepares to produce recommendations;

And recognizing that:1. Not all measures may need to be the object of interoperability;


interoperability needs on security measures (encryption, authentication, key management) be confirmed

ACTION ITEM 20: SLS-A-0410-001CESG/CMC to establish a policy on whether a common set of security

measures should be included in the CCSDS interoperability work [Dec 2004]

SLS AREA REPORT

November 2004 38


RESOLUTION 14 : SLS-R-0410-002

Considering that:1. The Security WG is developing a GB on security measures and prepares

to produce recommendations;

2. Security measures may affect all layers of the ‘stack’;

And recognizing that:1. The Security WG needs the expert support from the SLS Area


joint SLS Area – Security WG meetings be held on a regular basis

ACTION ITEM 21: SLS-A-0410-002SLS AD and SE AD to agree on regular SLS – Security meetings [Nov 2004]

SLS AREA REPORT

Documents

November 20041 SLS AREA REPORT November 2004. 2 SLS AREA REPORT CONTENTS A.CURRENTLY ACTIVE WGs AND BOFs WITHIN AREA B.SUMMARY TECHNICAL STATUS OF EACH