[Detnet] I-D Action: draft-ietf-detnet-nscore-02.txt

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Internet-Draft draft-ietf-detnet-nscore-02.txt is now available. It is a work
item of the Deterministic Networking (DETNET) WG of the IETF.

   Title:   On-time Forwarding with Non-Work Conserving Stateless Core Fair Queuing
   Authors: Yeoncheol Ryoo
            Jinoo Joung
            Changho Choi
   Name:    draft-ietf-detnet-nscore-02.txt
   Pages:   14
   Dates:   2026-07-06

Abstract:

   This document specifies the framework and operational procedure for
   deterministic networking that guarantees maximum and minimum end-to-
   end latency bounds to flows.  The solution has non-periodic,
   asynchronous, flow-level, non-work conserving, on-time, and rate-
   based functional characteristics, according to the taxonomy suggested
   by [I-D.ietf-detnet-dataplane-taxonomy].

   The packets are stored in the queue in ascending order of the ideal
   service start time, called Eligible Time (ET), and the ideal service
   completion time, called Finish Time (FT).  The queued packets were
   forwarded after ET, in ascending ordering of FT, in a non-work
   conserving manner.  The ET and FT are calculated at the entrance node
   according to the packet size and rate of the flow.  All subsequent
   core nodes are stateless and asynchronously update ET and FT based on
   metadata received via packet headers.  This mechanism is called non-
   work conserving stateless fair queuing (N-SCORE), which guarantees
   both E2E latency upper and lower bounds, thus E2E jitter bound.

   N-SCORE supports two alternative methods for determining ET and FT at
   stateless core nodes.

   The Direct ET/FT Method propagates ET and FT generated by the
   previous node using the delay factor function.

   The Arrival-based ET/FT Method reconstructs ET and FT from the
   locally observed packet arrival time together with metadata carried
   in the packet header.  Both methods provide identical scheduling
   semantics while allowing different implementation choices.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-detnet-nscore/

There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-detnet-nscore-02

A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-detnet-nscore-02

Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts