On flow reservation and admission control for distributed scheduling strategies in IEEE802.11 wireless LAN

  • Authors:

  • Ming Li;B. Prabhakaran;Sathish Sathyamurthy

  • Affiliations:

  • The University of Texas at Dallas, Richardson, Texas;The University of Texas at Dallas, Richardson, Texas;The University of Texas at Dallas, Richardson, Texas

  • Venue:
  • MSWIM '03 Proceedings of the 6th ACM international workshop on Modeling analysis and simulation of wireless and mobile systems
  • Year:
  • 2003

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Abstract

Providing service differentiation in IEEE802.11 Wireless LANs [3] has been investigated by many researchers ([2], [5], [6], [7], [9], [13]). It has been shown [1] that some distributed schedulers such as DFS [9] and EDCF [5] can achieve high throughput and certain service differentiation comparing to DCF and PCF provided that the traffic load in the system is low or medium. However, those strategies do not support flow reservation and thus cannot guarantee QoS requirements of high priority real-time flows under overloading network traffics. In this paper, we present a MAC layer flow reservation and admission control scheme for distributed scheduling strategies in the aim of achieving QoS guarantee in IEEE802.11 wireless LANs. Our approach has several desirable features: (1) It can work with most of the distributed scheduling strategies like DCF, DFS, EDCF without modification of the underlying scheduling mechanism. (2) A dynamic priority re-allocation method is integrated with the admission control to further improve system throughput. (3) Misuse of priority can be easily handled. Simulation of our proposed reservation scheme upon various distributed scheduling strategies has been conducted, and results show that this scheme can achieve low collision rate, high throughput, and less delay.