Projects

Overview
Project Title	Delay-Tolerant Reliable Multicast
Approval	Draft
Document Number
Charter	6.09 Delay Tolerant Networking Working Group
Document Type	Blue
Description of Document	As space flight missions become more frequent and more complex, it will become apparent that multicast communications (delivering a given item of information to multiple entities that have expressed interest in it) may be as useful in space networks as it has proven in the Internet. A new standard for reliable multi-point data delivery in delay-tolerant networking is needed.
Applicable Patents	There are no patent issues for this technology that are known by the CCSDS community
Patent Comments
Survey of Similar Standards Documents or Projects Undertaken in Other Bodies and elsewhere in CCSDS	The CCSDS Asynchronous Message Service provides a publish/subscribe service among others, but AMS is not designed for efficient large-scale, high-volume data publication. Internet multicast is not a viable option because reliable IP multicast methods rely on in-order end-to-end retransmission, which is unsuitable for space flight communications.
Resources
Book Editor	NASA
Book Editor Resources	6 work months
Prototype 1	NASA
Prototype 1 Resources	6 work months
Prototype 2
Prototype 2 Resources
Prototype 3
Prototype 3 Resources
Contribute	NASA
Monitor Only
Resource Comments	Resources, contributors, and monitors for this project have not yet been identified. The project is being posted in order for the DTN WG to begin tracking it in planning and scheduling.

Schedule

Legend for Schedule Milestones = Required for Orange Books = Required for Green Books = Required for Magenta Books = Required for Blue Books Note - Red Books are Draft Blue/Magenta Books Schedule Milestones	Original Completion Date (Date in M/D/YYYY format.)	Comments (Date in M/D/YYYY format.)
Project Approved	11/1/2020
Project Start Date	1/11/2021
Internal WG Review
First Draft Circulated to WG	5/15/2021
First Draft Comments Due	6/15/2021
Second draft circulated to WG	8/1/2021
Second Draft Comments Due	9/1/2021
Final WB Submitted to AD for Further Processing	10/1/2021
External Milestones
Secretariat Document Processing	2/1/2022
First Agency Review	4/1/2022
RID Resolution	5/1/2022
Secretariat Document Processing 2	6/1/2022
Final Agency Review	8/1/2022
RID Resolution	9/1/2022
First Prototype Development	6/1/2022
Second Prototype Development	6/1/2022
CMC Approval	11/1/2022
Total Time to Complete (in months)	21