From Gian.Paolo.Calzolari at esa.int  Fri Jul 18 08:58:42 2008
From: Gian.Paolo.Calzolari at esa.int (Gian.Paolo.Calzolari at esa.int)
Date: Fri, 18 Jul 2008 10:58:42 +0200
Subject: [Sls-slp] Repeating TC's / SLS-SLP Presentation to SLS area Plenary
Message-ID: <OFED725324.48EA2C6C-ONC125748A.00311769-C125748A.00315215@esa.int>

Takahiro, 
        thank you for your input. 
Do you investigate at CLTU level whether the CLTU you transmit several 
times was generated by an AD, BD or BC frame?

Ed, Greg,
        any details on the NASA/JPL implementation of this feature?


Ciao

Gian Paolo
----- Forwarded by Gian Paolo Calzolari/esoc/ESA on 18/07/2008 10:56 -----

Gian Paolo Calzolari/esoc/ESA
16/06/2008 18:13

To
Takahiro Yamada <tyamada at pub.isas.jaxa.jp>
cc
Edward.Greenberg at jpl.nasa.gov, "Greg J. Kazz" <Greg.J.Kazz at jpl.nasa.gov>, 
Jean-Luc.Gerner at esa.int, sls-slp at mailman.ccsds.org, 
sls-slp-bounces at mailman.ccsds.org
Subject
Re: [Sls-slp] SLS-SLP Presentation to SLS area Plenary







sls-slp-bounces at mailman.ccsds.org wrote on 16/06/2008 17:27:54:

> Gian Paolo,
> 
> > We would really appreciate knowing some details on the NASA/JPL (Ed? 
> > Greg?) and JAXA (Takahiro?) implementations of this feature also to 
> > understand how much those implementations are within the line of the 
> > current standards.
> 
> For deep space missions, we send each command frame (actually, it is a 
> CLTU) multiple times in order to decrease the probability of 
> retransmission. For example, if we are to send command frames #1, #2, 
> #3, and #4, we send #1, #1, #2, #2, #3, #3, #4, and #4. This is a case 
> in which we send the same command twice and this is what we use for our 
> asteroid mission, but we can send the same command any number of times.

Takahiro, 
        thank you for your input. 
Do you investigate at CLTU level whether the CLTU you transmit several 
times was generated by an AD, BD or BC frame?

Ciao

Gian Paolo


> 
> For doing retransmission, we use COP-1 as specified by CCSDS.
> 
> I'm not sure if this violates the specification of COP-1 but I will 
> check it when I have time.
> 
> Best regards,
> Takahiro Yamada.
> 
> 
> _______________________________________________
> Sls-slp mailing list
> Sls-slp at mailman.ccsds.org
> http://mailman.ccsds.org/mailman/listinfo/sls-slp
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ccsds.org/pipermail/sls-slp/attachments/20080718/4d411c7c/attachment.html>

From Gian.Paolo.Calzolari at esa.int  Thu Jul 24 07:46:15 2008
From: Gian.Paolo.Calzolari at esa.int (Gian.Paolo.Calzolari at esa.int)
Date: Thu, 24 Jul 2008 09:46:15 +0200
Subject: [SLS-SLP] [SLS-CC] Options for Repeated Transmissions of TC Transfer
	Frames: Concept Paper
Message-ID: <OF7E8956F1.20E3940D-ONC1257490.0029AC2B-C1257490.002AAFCD@esa.int>

Dear All,
        I have just uploaded in CWE the promised concept paper 
(TCretransmit6.pdf) for the Options for Repeated Transmissions of TC 
Transfer Frames

The file is available in  
        The CCSDS Collaborative Work Environment (CWE) > Space Link 
Services Area (SLS) > Documents > SLS-SLP > Draft Documents 
at URL
http://cwe.ccsds.org/sls/docs/Forms/AllItems.aspx?RootFolder=http%3a%2f%2fcwe.ccsds.org%2fsls%2fdocs%2fSLS-SLP%2fDraft%20Documents&FolderCTID=0x012000439B56FF51847E41B5728F9730D7B55F


Note that the paper is intended to be the starting point for the 
discussion in Berlin.

Your comments are welcome.

Ciao

Gian Paolo Calzolari

PS This mail is address to also toe Code & Synchronization WG for possible 
(minor) impact on the TC Coding Layer.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ccsds.org/pipermail/sls-slp/attachments/20080724/1a72d0e6/attachment.html>