NDLI: EnhancingIEEE 802.11 performance in congested environments

Content Provider	Springer Nature Link
Author	Aad, Imad Castelluccia, Claude
Copyright Year	2003
Abstract	IEEE 802.11 is the most deployed wireless local area networking standard nowadays. It uses carrier sense multiple access with collision avoldance (CSMA/CA) to, resolve contention between nodes. Contention windows (CW) change dynamically to adapt to the contention level: Upon each collision a node doubles itsCW to, reduce further collision risks. Upon a successful transmission theCW is reset, assuming the contention level dropped. However, contention level is more likely to change slowly, and resetting theCW causes new collisions and retransmissions before reaching the optimal value again. This wastes bandwidth and increases delays. In this paper we propose simple slowCW decrease functions and compare their performances to the legacy standard. We analyze them through simulation and show their considerable enhancement at all congestion levels and transient phases. IEEE 802.11 est la norme de réseaux locaux sans-fil la plus déployée de nos jours. Il utiliseCSMA/CA pour résoudre les conflits entre émetteurs. Les fenêtres de conflits (CW) changent dynamiquement pour s’adapter au niveau de conflits; après chaque collision un émetteur double sa fenêtre pour réduire les risques de futures collisions. Après chaque bonne émission, un émetteur remet sa fenêtre à sa valeur initiale, supposant que le niveau de conflit a diminué. Cependant, le niveau de conflit change lentement, et la remise de la fenêtre à sa valeur initiale cause de nouvelles collisions et de nouvelles retransmissions avant d’atteindre la bonne valeur de nouveau. Ceci dégrade considérablement les performances (débits, délais etc.). Dans cet article nous proposons des fonctions de décrémentation «lentes» des fenêtres, et nous comparons leurs performances à celles de la norme actuelle. Nous les analysons par simulation et nous montrons les gains considérables qu’elles apportent, sous tous les niveaux de congestion ainsi que durant les phases transitoires.
Starting Page	397
Ending Page	416
Page Count	20
File Format	PDF
ISSN	00034347
Journal	Annales Des Télécommunications
Volume Number	58
Issue Number	3-4
e-ISSN	19589395
Language	French
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Paris
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Réseau local entreprise sans fil Accès multiple Maîtrise encombrement Détection collision Débit transmission Retard Communications Engineering, Networks Information Systems and Communication Service Signal, Image and Speech Processing Computer Communication Networks Information and Communication, Circuits R & D/Technology Policy
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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