[SLS] Review of SLS Area Contents and Goals by 10 July

[Gian.Paolo.Calzolari at esa.int]

Dear All,
        CMC and CESG Chair has requested to review the Area contents (Area 
content tab) and goals in the CWE on-line strategic plan.
For SLS you can find this information here:  
http://cwe.ccsds.org/fm/sp/Lists/SLSContent/AllItems.aspx and at the 
bottom of this mil for your convenience.
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?

I think the contents below are quite stable and I would expect only minor 
changes (if any).

I would appreciate receiving any comment by 10 July 2015.

Thank you all for the collaboration.

Gian Paolo

==================================
SPACE LINK SERVICES AREA
?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.

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.

The SLS area needs to coordinate:
    with CSS for the identification of relevant parameters for service 
management;
    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;
    with SEA for Delta-DOR issues;
    with MOIMS and CSS if the need of standardized exchange of 
meteorological and orbital data will be required for optical 
communications;
    with SEA for adoption and integration of security-related recommended 
standards and practices;
    the SANA-recommended practices for registries and repositories.

The strategic goals of the SLS area are presented below.

SLS GOAL 1
        ?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.?

SLS GOAL 2
        ?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.?

SLS GOAL 3
        ?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.?
 
SLS GOAL 4
        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.?
 
SLS GOAL 5
        ?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.?
 
SLS GOAL 6
        ?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.?


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