Resource allocation and management in DiffServ networks for IP telephony

  • Authors:

  • Maarten Büchli;Danny De Vleeschauwer;Jan Janssen;Annelies Van Moffaert;Guido H. Petit

  • Affiliations:

  • Alcatel Bell, Network Strategy Group, Francis Wellesplein 1, B-2018 Antwerp, Belgium;Alcatel Bell, Network Strategy Group, Francis Wellesplein 1, B-2018 Antwerp, Belgium;Alcatel Bell, Network Strategy Group, Francis Wellesplein 1, B-2018 Antwerp, Belgium;Alcatel Bell, Network Strategy Group, Francis Wellesplein 1, B-2018 Antwerp, Belgium;Alcatel Bell, Network Strategy Group, Francis Wellesplein 1, B-2018 Antwerp, Belgium

  • Venue:
  • NOSSDAV '01 Proceedings of the 11th international workshop on Network and operating systems support for digital audio and video
  • Year:
  • 2001

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Abstract

This paper discusses resource allocation and management in Differentia ted Services (DiffServ) networks, particularly in the context of IP telephony. We assume that each node uses Weighted Fair Queuing (WFQ) schedulers in order to provide Quality of Service (QoS) to aggregates of traffic. All voice traffic destined for a certain output interface is aggregated into a single queue. When a voice flow traverses a node, its packets are placed in this queue; which is drained at a certain rate, determined by a weight associated with that queue. This paper shows how to set this weight such that the edge-router-to-edge-router queuing delay in the DiffServ network is statistically bounded. The nodes are modeled as M/G/1 queuing systems and a heuristic formula is used to compute a quantile of the queuing delay. This formula is compared with results derived from simulations. It is also shown how to use this result to allocate the appropriate resources in a DiffServ network and how to update and process RSVP messages at the edge of a DiffServ network in an IntServ over DiffServ scenario.