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One of the most important approaches is the so\u2010called Differentiated Services (DiffServ) architecture, which provides a scalable mechanism for QoS support in a TCP\/IP network. The main concept underlying DiffServ is the aggregation of traffic flows at an ingress (or egress) point of a network and the marking of the IP packets of each traffic flow according to several classification criteria. Diffserv is classified under two taxonomies: the absolute and the relative. In absolute DiffServ architecture, an admission control scheme is utilized to provide QoS as absolute bounds of specific QoS parameters. The relative DiffServ model offers also QoS guarantees per class but in reference to the guarantees given to the other classes defined. In this paper, relative proportional delay differentiation is achieved based on class\u2010based queueing (CBQ) scheduler. Specifically, the service rates allocated to the classes of a CBQ scheduler are frequently adjusted in order to obtain relative delay spacing among them. The model presented can also be exploited in order to meet absolute delay constraints in conjunction with relative delay differentiation provision. Simulation experiments verify that our model can attain relative as well as absolute delay differentiation provided that the preconditions posed are satisfied. Copyright \u00a9 2004 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/dac.675","type":"journal-article","created":{"date-parts":[[2004,7,9]],"date-time":"2004-07-09T12:01:10Z","timestamp":1089374470000},"page":"743-761","source":"Crossref","is-referenced-by-count":8,"title":["Proportional delay differentiation provision by bandwidth adaptation of class\u2010based queue scheduling"],"prefix":"10.1002","volume":"17","author":[{"given":"Angelos","family":"Michalas","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Malamati","family":"Louta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paraskevi","family":"Fafali","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"George","family":"Karetsos","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vassilios","family":"Loumos","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2004,7,9]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1109\/35.592102"},{"key":"e_1_2_1_3_2","doi-asserted-by":"crossref","unstructured":"NicholsK BlakeS BakerF BlackD.Definition of the differentiated services field (DS Field) in the IPv4 and IPv6 headers. 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