1. Cislunar BOF
5/14/2004
Montreal

2. Goals for Today Problem Definition Gauge Interest
Outline Working Group Charter
Assess Resources

3. 0800 – Description of BOF / Agenda Bashing
0810 – Cislunar and In-situ Communications Overview
0820 – Goals of a Cislunar Working Group
Issues / Presentations
0830 – Requirements
0845 – SCPS-TP
0915 – CFDP
0945 – Delay Tolerant Networking
1015 – Brief survey of other technologies
1030 – Open mike for other issues
1100 – Interest Straw Poll
1110 – Discussions of the way forward:
Draft Charter
Possible work items
Schedule
1200 – Adjourn

4. Definitions Cislunar In-Situ
adj: situated between the Earth and the Moon
In-Situ
adj: being in the original position; not having been moved; "the archeologists could date the vase because it was in situ"; "an in-situ investigator" [syn: unmoved]
In-situ communications: communications between physically proximate endpoints

5. Motivation
Increased interest in human and robotic exploration of the Moon and Mars
Near-Earth comms: can be “Internet-like”
Deep-Space: TC / TM, CFDP, DTN
What about lunar distances? (~2.5 sec RTT)
End-to-End TCP falls over
SCPS-TP works OK, gateways improve performance
Application performance will vary
Human exploration adds new requirements
Very high rate, voice/video (HDTV), reliability, availability

6. Goals of a Cislunar Working Group (1/2)
Determine requirements of possible new Lunar exploration programs and their mapping into similar capabilities that will be needed on and around Mars
Products: Yellow Book on cislunar / Mars comm. requirements
Create a top-level operations concept for communicating effectively over the whole range of cislunar distances
Products: Green Book for Cislunar Communication

7. Goals of a Cislunar Working Group (2/2)
Review existing capabilities (CCSDS space internetworking standards, other standardization groups (such as the IETF))
Products: Yellow Book on existing communications capabilities
Updates to existing standards (pink sheets)
Protocol development if needed
Products: Blue Book(s) describing protocols for cislunar communications

8. Requirements? Voice Videoconference HDTV downlink
Operation in intermittently-connected environments?
Tele-operation of robots
WASHINGTON (CNN) -- Saying "the desire to explore and understand is part of our character," President Bush Wednesday unveiled an ambitious plan to return Americans to the moon by 2020 and use the mission as a steppingstone for future manned trips to Mars and beyond.

9. Existing Capabilities DTN CFDP SCPS-TP

10. Brief Survey of Related Technologies

11. IETF LEMONADE
Lemonade is tasked to provide a set of enhancements and profiles of Internet submission, transport, and retrieval protocols to facilitate operation on platforms with constrained resources, or communications links with high latency or limited bandwidth. A primary goal of this work is to ensure that those profiles and enhancements continue to interoperate with the existing Internet protocols in use on the Internet, so that these environments and more traditional Internet users have access to a seamless service.

12. IETF IP-over-DVB
The WG will develop new protocols and architectures to enable better deployment of IP over MPEG-2 transport and provide easier interworking with IP networks. Specific properties of this subnetwork technology include link-layer support for unicast and multicast, large numbers of down-stream receivers, and efficiency of transmission.

13. DVB-S
Possibility of signaling link changes (coding, data rate, ...)

14. IETF Datagram Congestion Control Protocol (dccp)
The Datagram Control Protocol working group is chartered to develop and standardize the Datagram Congestion Control Protocol (DCCP). DCCP is a minimal general purpose transport-layer protocol providing only two core functions:
the establishment, maintenance and teardown of an unreliable packet flow.
congestion control of that packet flow.

15. IETF SCTP (RFC2960)
SCTP is a reliable transport protocol operating on top of a connectionless packet network such as IP. It offers the following services to its users:
acknowledged error-free non-duplicated transfer of user data,
data fragmentation to conform to discovered path MTU size
sequenced delivery of user messages within multiple streams, with an option for order-of-arrival delivery of individual user messages
optional bundling of multiple user messages into a single SCTP packet
network-level fault tolerance through supporting of multi-homing at either or both ends of an association.
The design of SCTP includes appropriate congestion avoidance behavior and resistance to flooding and masquerade attacks.

16. Middlebox Architectures
IETF midcom working group
As trusted third parties are increasingly being asked to make policy decisions on behalf of the various entities participating in an application's operation, a need has developed for applications to be able to communicate their needs to the devices in the network that provide transport policy enforcement. Examples of these devices include firewalls, network address translators (both within and between address families), signature management for intrusion detection systems, and multimedia buffer management. These devices are a subset of what can be referred to as 'middleboxes.'
SCPS-TP Gateways

17. Interest Straw Poll

18. Possible Work Items Green book describing operations concept
Yellow book describing requirements for cislunar and Mars in-situ environments
Yellow book assessing existing capabilities
Pink sheets updating existing CCSDS protocols
Blue / Orange books for any new protocols identified / developed

19. Will put draft charter on docushare.
Cislunar Mailing List
MAILING LIST:
(sign up through
Will put draft charter on docushare.

20. Draft Charter

21. End of presentation.

22. BACKUP

24. Some Data Points Earth-Moon distance is 384,748 km (~1.28s one-way)
Earth-Mars distance varies between ~4 minutes and ~20 minutes (one-way)

25. SCPS-TP Extensions to TCP that provide
Record boundaries
Selective Negative Acknowledgements (SNACKs)
Specification of alternate congestion control mechanisms
Vegas congestion control, rate control
Needed Additions
SACK, ECN, Ipv6, DVB-RCS (coordination/session)
Signaled payload compression?