Subject: [Tsvwg] Proposed new Per Hop Behaviour and edge-to-edge architecture

From: [email-masked]
Date: Fri, 15 Jul 2005 00:06:18 +0100

Hi,   

We've submitted a couple of new drafts, which we'd very much appreciate your comments and feedback on - they'll be discussed at Paris. They're available at:

http://www.ietf.org/internet-drafts/draft-briscoe-tsvwg-cl-phb-00.txt 

http://www.ietf.org/internet-drafts/draft-briscoe-tsvwg-cl-architecture-00.txt

The first doc defines two new per-hop behaviours (PHBs) for a Controlled Load (CL) service - our target is inelastic flows such as those for streaming real-time media. Explicit Congestion Notification (ECN) marking semantics are defined as part of the PHBs, to provide an "early warning" of potential congestion. The PHBs can be used as a basic building block within an edge-to-edge (CL-ramp-PHB) or end-to-end (CL-step-PHB) QoS architecture, using distributed measurement-based admission control.

The second doc gives more details of our edge-to-edge architecture, and shows how the CL-ramp-PHB is a fundamental building block in our edge-to-edge architecture, and in turn how this is a building block within a broader QoS architecture achieving an end-to-end CL service.

The work has quite a lot of similarity with the RTECN (Real-time ECN) work already being discussed within TSVWG - we have a similar aim (to achieve a low delay, jitter and loss service suitable for RT traffic) and a similar approach (per microflow admission control combined with an "early warning" of potential congestion through setting the Congestion Experienced codepoint). The RTECN architecture is end-to-end - so we hope that (an evolution of) the CL-step-PHB may be suitable for (an evolution of) the RTECN architecture.

Looking forward to your comments,

Best wishes,

Philip Eardley

Networks Researcher

BT Group 

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