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Resource Unavailability PDB

Resource Unavailability PDB. draft-karagiannis-ru-pdb-03.txt. Georgios Karagiannis, Attila Bader, Hannes Tschofenig, Lars Westberg. Problem to be solved. Without using signaling, how can a diffserv node at outside Diffserv domain(s) detect resource unavailability in Diffserv domain(s)?.

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Resource Unavailability PDB

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  1. Resource Unavailability PDB draft-karagiannis-ru-pdb-03.txt Georgios Karagiannis, Attila Bader, Hannes Tschofenig, Lars Westberg

  2. Problem to be solved • Without using signaling, how can a diffserv node at outside Diffserv domain(s) detect resource unavailability in Diffserv domain(s)?

  3. Goal of the draft • Draft provides a Per Domain Behavior (PDB) solution for this problem by using throughput (bandwidth) measurements and DSCP remarking in Diffserv domain(s) to notify resource unavailability to nodes outside the Diffserv domain(s)

  4. Changes based on received comments • RU-PDB Applicability section clarified • Traffic Conditioning Specification (TCS) and PHB configuration clarified • Editorial changes

  5. RU-PDB Applicability • Resource unavailability on Diffserv nodes detected using excess traffic measurements and DSCP remarking approach where remarking proportional to amount of unavailable resources • Diffserv nodes located outside Diffserv domain(s) can use remarked DSCP packets to calculate the throughput (or bandwidth) that exceeds the loosely agreed SLS throughput bound • Applied in combination with: • Single Diffserv domain • Multiple neighboring Diffserv domains when SLA agreements exist between operator(s) of the domain(s)

  6. RU-PDB Applicability • Sender of traffic blocks new requests until the loosely agreed SLS throughput bound is satisfied; this operation is outside scope of this draft • Applied in any IP based Diffserv scenario that supports real-time applications and use media codecsthat do not have the benefit of being totally free in selecting/producing bit-rates: • minimum bandwidth allocated by using the DSCP based RU-PDB mechanism in combination with admission control functionality • when Diffserv network has more capacity it can utilize that and give to end user higher quality with better end user experience • end to end ECN method (DCCP) can be used to monitor whether thenetwork has more available capacity.

  7. TCS and PHB Configuration • Clarified how (1) Meter + (2) Marking + (3) Packet Classification + (4) Scheduling work

  8. Conclusions and future work: • Without using signaling but using throughput (bandwidth) measurements and DSCP remarking in Diffserv domain(s) able to notify resource unavailability to nodes outside Diffserv domains • It can be used in combination with end-to-end ECN (DCCP) when QoS support for real time applications that use media codecs is required.

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