Projects

Overview
Project Title	Unified Space Data Link Protocol Green Book
Approval	Approved
Document Number	700.1
Charter	5.04 Space Link Protocols Working Group
Document Type	Green
Description of Document	This work will describe the concepts, rationale, requirements, and operational scenarios envisioned towards a new generic CCSDS Data Link layer protocol, the Next Generation Space Link layer Protocol (NGSLP) examining all CCSDS space links i.e., Direct to Earth (DTE), Direct from Earth (DFE), and Proximity Environments). This project is the direct follow on result of the initial concept paper, which the WG produced as a prerequisite for the approval of this project. The NGSLP is targeted for agencies emerging missions, both human and robotic, which we anticipate will require higher performance (higher data rates and throughput) and operate with enhanced security. We define a new space data link layer protocol that is largely based upon the proven features of the existing CCSDS link protocols and adds options that can be used to tailor future mission link layer needs. In addition, the interfaces with other CCSDS working groups such as the emerging channel coding option of decoupling the transfer frame length from the code block size currently under study by the C&S WG will be investigated. This option would remove the constraint to align the transfer frame with the code block, allowing frame sizes to be explicitly tailored to mission requirements and enable future mission operational link layer modes. We believe this project should be immediately approved because of the long lead time required to develop standards, the emerging link layer requirements of the newly formed optical comm WG, and the changes to agencies space and ground link layer infrastructure required to support the emerging Space Data Link Security (SDLS) protocol and substantial increases in link data rates, provides an opportunity to introduce future link layer modifications. This Project is related to the NGSLP Blue Book Project described in the framework. This GB project extends past the BB project, because we envision that in the actual writing of the BB, some concepts identified in the GB may change, and there the GB might require an update before publication.
Applicable Patents	There are no patent issues for this technology that are known by the CCSDS community
Patent Comments	No patent issues.
Survey of Similar Standards Documents or Projects Undertaken in Other Bodies and elsewhere in CCSDS
Resources
Book Editor	NASA
Book Editor Resources	NASA will provide the Book Editor. Assume 6MM required.
Prototype 1	Not Required
Prototype 1 Resources
Prototype 2	Not Required
Prototype 2 Resources
Prototype 3
Prototype 3 Resources
Contribute	DLR, NASA, UKSA
Monitor Only	CNES, ESA
Resource Comments

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	10/31/2013	CMC-P-2014-08-004 Confirmed by CNES delegate.
Project Start Date	10/15/2014
Internal WG Review
First Draft Circulated to WG	12/15/2013
First Draft Comments Due	2/10/2014
Second draft circulated to WG	4/21/2014	Before Fall 2015 meeting
Second Draft Comments Due	5/21/2014	Before Fall 2019 meeting
Final WB Submitted to AD for Further Processing	6/21/2014
External Milestones
Secretariat Document Processing	9/15/2014	Poll CESG-P-2020-04-004 started 30 April 2020
First Agency Review
RID Resolution
Secretariat Document Processing 2
Final Agency Review
RID Resolution
First Prototype Development
Second Prototype Development
CMC Approval	3/22/2016	Poll CMC-P-2020-06-004 closed 15 June 2020
Total Time to Complete (in months)	17