<font size=2 face="sans-serif">Dear All,</font>
<br><font size=2 face="sans-serif"> CMC
and CESG Chair has requested to review the Area contents (Area content
tab) and goals in the CWE on-line strategic plan.</font>
<br><font size=2 face="sans-serif">For SLS you can find this information
here: </font><a href=http://cwe.ccsds.org/fm/sp/Lists/SLSContent/AllItems.aspx><font size=2 face="sans-serif">http://cwe.ccsds.org/fm/sp/Lists/SLSContent/AllItems.aspx</font></a><font size=2 face="sans-serif">
and at the bottom of this mil for your convenience.</font>
<br><font size=2 face="sans-serif">Keeping in mind that we have six goals
(i.e. one per WG), can you please review the general description of SLS
Area and (at least) the goal related to your WG?</font>
<br>
<br><font size=2 face="sans-serif">I think the contents below are quite
stable and I would expect only minor changes (if any).</font>
<br>
<br><font size=2 face="sans-serif"><b>I would appreciate receiving any
comment by 10 July 2015.</b></font>
<br>
<br><font size=2 face="sans-serif">Thank you all for the collaboration.</font>
<br>
<br><font size=2 face="sans-serif">Gian Paolo</font>
<br>
<br><font size=2 face="sans-serif">==================================</font>
<br><font size=2 face="sans-serif"><b>SPACE LINK SERVICES AREA</b></font>
<br><font size=2 face="sans-serif">The objective of the SLS area is
to address all of the point-to-point communications links and protocols
that interconnect a spacecraft with its ground-support system, or with
another spacecraft, by developing standards for efficient and reliable
space link communications systems addressing nominal as well as emergency
scenarios. Specific attention is given by SLS to needs for higher data
rates and better link performances, a standard security mechanism, and
lower cost, mass, and power.</font>
<br>
<br><font size=2 face="sans-serif">SLS area objectives focus on Layers
1 & 2 (of the Open Systems Interconnection [OSI] protocol stack)—i.e.,
the Physical Layer and the Data Link Layer. This means that SLS concentrates
in particular on radio-frequency and optical systems, modulation, synchronization
and channel coding, and data link protocols, for both long-haul (e.g.,
spacecraft-to-ground) and proximity links (e.g., orbiter-to-lander). Moreover
SLS concentrates also on two additional functions essential on the space
link: data compression for end-to-end data transfer optimization, and ranging
for accurate orbit determination.</font>
<br>
<br><font size=2 face="sans-serif">The SLS area needs to coordinate:</font>
<br><font size=2 face="sans-serif"> with CSS for the identification
of relevant parameters for service management;</font>
<br><font size=2 face="sans-serif"> with CSS for the inner
behavior (i.e., the implementation aspects and not the terrestrial interface
characteristics) of the CSTS to be made available to other agencies;</font>
<br><font size=2 face="sans-serif"> with SEA for Delta-DOR
issues;</font>
<br><font size=2 face="sans-serif"> with MOIMS and CSS if
the need of standardized exchange of meteorological and orbital data will
be required for optical communications;</font>
<br><font size=2 face="sans-serif"> with SEA for adoption
and integration of security-related recommended standards and practices;</font>
<br><font size=2 face="sans-serif"> the SANA-recommended practices
for registries and repositories.</font>
<br>
<br><font size=2 face="sans-serif">The strategic goals of the SLS area
are presented below.</font>
<br>
<br><font size=2 face="sans-serif"><b>SLS GOAL 1</b></font>
<br><font size=2 face="sans-serif"> Enable
efficient bi-directional transmission for near-Earth spacecraft (including
missions to—and/or orbiting around—the Moon and at Lagrange points) and
deep-space spacecraft (especially Mars missions) by developing appropriate
modulation schemes for telecommand, telemetry, and ranging signals in the
applicable frequency bands while providing narrower bandwidth and higher
data returns.</font>
<br>
<br><font size=2 face="sans-serif"><b>SLS GOAL 2</b></font>
<br><font size=2 face="sans-serif"> Produce
efficient standards for coding schemes and synchronization, providing new
generations of space missions with telecommand and telemetry capabilities
beyond current technologies, such that spacecraft interconnection with
its ground support system, or with another spacecraft, can accommodate
higher data rates and better link performances, together with lower cost,
mass, and power.</font>
<br>
<br><font size=2 face="sans-serif"><b>SLS GOAL 3</b></font>
<br><font size=2 face="sans-serif"> To
provide efficient space data link protocols capable of satisfying the needs
of current and future missions; i.e., to produce or maintain standards
to support smoothly higher data rates with seamless interface to both user
applications and communication technologies over radio frequency (RF) and/or
optical links.</font>
<br><font size=2 face="sans-serif"> </font>
<br><font size=2 face="sans-serif"><b>SLS GOAL 4</b></font>
<br><font size=2 face="sans-serif"> Develop
data compression standards enabling efficient data rates and volume reduction
to maximize the usage of available space links bandwidth and onboard storage
capacity. These internationally agreed data compression standards will
foster interoperability and multi-mission development of compression functions.</font>
<br><font size=2 face="sans-serif">
</font>
<br><font size=2 face="sans-serif"><b>SLS GOAL 5</b></font>
<br><font size=2 face="sans-serif"> Provide
security functions operating at Layers 1 & 2 (of the OSI protocol stack)
of CCSDS space links. The targeted security services include authentication,
integrity check, anti-replay, and confidentiality both for uplink and downlink.
The corresponding security protocols/functions shall be compatible with
CCSDS TM, TC, and AOS data link protocols and be independent from any specific
cryptographic algorithm. Develop associated management functions for monitoring
and control, key and security association management. Security at Physical
Layer level should also be considered.</font>
<br><font size=2 face="sans-serif">
</font>
<br><font size=2 face="sans-serif"><b>SLS GOAL 6</b></font>
<br><font size=2 face="sans-serif"> Establish
a common framework of standardized services for space optical communications
for interoperability and cross support by creating new standards for optical
links (ISO Layers 1 & 2), taking into account the uniqueness of these
types of links, such as very high data rates, geographic station diversity,
and atmosphere (“weather”) influences. Consider also the services to
be offered/required to/by space data link protocols and relevant procedures.
Finally, identify the needed coordination with other CCSDS areas.</font>
<br>
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