A novel scheduler for VBR traffic in IEEE 802.11 HCCA WLANs. (6th September 2011)

• Record Type: Journal Article
• Authors: Kuo, Yaw-Wen; Tsai, Jin-Hsiu
• Is Part Of: International journal of ad hoc and ubiquitous computing. Volume 8:Number 3(2011)
• Page Start: 165
• Page End: 173
• Publication Date: 2011-09-06
• Subjects: HCCA WLANs -- QoS -- quality of service -- scheduling -- wireless LANs -- local area networks -- variable bit rate -- VBR -- simulation -- flow loss rate -- admission control -- hybrid coordination function -- HCF controlled channel access; Ubiquitous computing -- Periodicals; Embedded computer systems -- Periodicals; Electronic data processing -- Distributed processing -- Periodicals; Wireless communication systems -- Periodicals; Computer architecture -- Periodicals; 004.2
• Languages: English
• ISSNs: 1743-8225

Abstract

IEEE 802.11 standard provides a reference scheduler with admission control, which is suitable for CBR traffic because the allocation of Transmission Opportunity (TXOP) duration is only based on the mean data rate. This paper proposes a novel scheduler for Variable Bit Rate (VBR) traffic, where the polling list and TXOP values are dynamically updated according to the current backlog and the measured loss rate of each flow. Moreover, an effective admission method is also provided as well to guarantee the loss rate. According to our simulation results, the number of admitted flows in the proposed scheduler is close to that in the reference scheduler and the loss rate can be well controlled below the threshold.