Characteristics of assured service and an alternative RIO scheme in differentiated services networks

Seung Joon Seok, Sung Hyuck Lee, Jinwoo Park, Chul Hee Kang

Research output: Contribution to journalArticlepeer-review


Assured Service, a service model of Internet Differentiated Services (DiffServ) architecture, is not so well accommodated by the current Internet environment. This is because the Internet's Transmission Control Protocol (TCP) employs an AIMD (Additive Increase and Multiplicative Decrease) mechanism to control congestion. As a result, Assured Service cannot meet the target rate of high-profile flows in the presence of numerous low-profile flows. In this paper, a significant problem related to Assured Service and some of its causes are described with the help of simulation results. Subsequently, several previous approaches to address the problem of Assured Service are assessed. These deal with the sender, the marker, and/or the dropper. A modified RIO (RED with IN and OUT) algorithm called ARIO (Al-ternative RIO) is also proposed as an alternative solution to the problem. The ARIO classifies queue states into a 'greedy state' and a 'fair state' and applies other dropping rules to each state. A simulation model is used to evaluate the proposed mechanism. The simulation results illustrate that the ARIO may offer significant improvements in the end-to-end performance of Assured Service.

Original languageEnglish
Pages (from-to)269-280
Number of pages12
JournalComputer Systems Science and Engineering
Issue number4-5
Publication statusPublished - 2002 Jul


  • Assured Service
  • Differentiated Service
  • RIO
  • TCP

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Theoretical Computer Science
  • General Computer Science


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