Sustaining Negotiated QoS in Connection Admission Control for ATM Networks Using Fuzzy Logic Techniques

By Onifade, Olufade F. Williams; Aderounmu, G. A. et al. | Issues in Informing Science & Information Technology, Annual 2008 | Go to article overview

Sustaining Negotiated QoS in Connection Admission Control for ATM Networks Using Fuzzy Logic Techniques


Onifade, Olufade F. Williams, Aderounmu, G. A., Tayo, Oluwasikemi, Issues in Informing Science & Information Technology


Introduction

The major objective of ATM is to integrate real-time information such as voice and video with non-real-time computer data, within the same transmission and switching medium ("TechArena Community", 2007). Data requires very low Bit Error Rate (BER) but can tolerate large propagation delays (seconds) (Valcourt, 1997). Voice and video require small propagation delays (milliseconds) but can tolerate some errors or small losses of information.

The objectives of ATM traffic management are to deliver Quality of Service (QoS) guarantee for the multimedia applications and provide overall optimization of network resources (Esaki, Iwamura, Kodama, & Fukuda, 1994). The control of ATM traffic is complicated due to ATM's high link speed and small cell size, the diverse service requirements of ATM applications, and the diverse characteristics of ATM traffic (Suda, 1998). The environment also has a significant impact on the choice of control mechanism, either local or wide area.

Connection Admission Control (CAC) is a procedure responsible for determining whether a connection request is admitted or denied. The procedure is based on resource allocation schemes applied to each link and switching unit (Esaki et al., 1994). Admission control decision is made using a traffic descriptor that specifies traffic characteristics alongside the QoS requirements. These traffic characteristics include: Peak Cell Rate (PCR); Sustainable Cell Rate (SCR); and Maximum Burst Size (MBS).

The statistical CAC takes advantage of the variable bit rate bursty nature of traffic with the hope that not all sources will need their peak rate at the same time thus balancing the peaks and valleys of the bit rates (Esaki et al., 1994). With this, allocation is made on the network which increases network utilization leading to network efficiency. Statistical gain can also be significant.

Fuzzy logic is multi-valued, dealing in degrees of membership or truth within the set (Kaehler, 1998; Kosko, 2003). Fuzzy logic us(x) describes the membership function of S, or the degree to which x is a member of the set S, this is known as the degree of truth.

[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]

With fuzzy logic, this transition at the borders of sets is gradual, thus for the allowance for membership in both sets (Kaehler, 1998).

The fuzzy logic analysis and control method is, therefore: * Receiving one of or a large number of measurements or other assessment of conditions existing in the control system.

* Processing all these inputs according to human based, fuzzy "If-Then" rules, which can be expressed in plain language words, in combination with traditional non-fuzzy processing.

* Averaging and weighting the resulting outputs from all the individual rules into one single output decision or signal which decides what to do or tells the controlled system what to do.

The output signal eventually arrived at is a precise appearing, defuzzified, "crisp" value as shown in Figure 1.

[FIGURE 1 OMITTED]

Background Study

For ATM networks to integrate all types of data and multimedia user traffic, CAC functions must provide guaranteed, or at least differentiated, quality of service levels. This must occur at the packet level to meet rate and delay specifications, and also occur at the connection level to give differentiated access to shared resources (Valcourt, 1997).

Much of the existing work on CAC specifies the QoS parameters as fixed values (e.g., traffic with peak 10 Mbps, and deadline 30 milliseconds) and does not exploit the dynamic fluctuations in resource availability (Esaki et al., 1994; Tian, 1998). A connection can be viewed as a contract between an application and the connection management system. A real-time connection is additionally characterized by stringent deadline constraints imposed on its packet delivery time (Devalla et. …

The rest of this article is only available to active members of Questia

Already a member? Log in now.

Notes for this article

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items

Items saved from this article

This article has been saved
Highlights (0)
Some of your highlights are legacy items.

Highlights saved before July 30, 2012 will not be displayed on their respective source pages.

You can easily re-create the highlights by opening the book page or article, selecting the text, and clicking “Highlight.”

Citations (0)
Some of your citations are legacy items.

Any citation created before July 30, 2012 will labeled as a “Cited page.” New citations will be saved as cited passages, pages or articles.

We also added the ability to view new citations from your projects or the book or article where you created them.

Notes (0)
Bookmarks (0)

You have no saved items from this article

Project items include:
  • Saved book/article
  • Highlights
  • Quotes/citations
  • Notes
  • Bookmarks
Notes
Cite this article

Cited article

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited article

Sustaining Negotiated QoS in Connection Admission Control for ATM Networks Using Fuzzy Logic Techniques
Settings

Settings

Typeface
Text size Smaller Larger Reset View mode
Search within

Search within this article

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Help
Full screen

matching results for page

    Questia reader help

    How to highlight and cite specific passages

    1. Click or tap the first word you want to select.
    2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
    3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

    OK, got it!

    Cited passage

    Style
    Citations are available only to our active members.
    Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

    1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

    Cited passage

    Thanks for trying Questia!

    Please continue trying out our research tools, but please note, full functionality is available only to our active members.

    Your work will be lost once you leave this Web page.

    Buy instant access to save your work.

    Already a member? Log in now.

    Author Advanced search

    Oops!

    An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.