Title: Improving the QoS of IEEE 802.11e networks through imprecise computation

Authors: Anna Lina Ruscelli; Gabriele Cecchetti

Addresses: TeCIP Institute, Scuola Superiore Sant'Anna, Via G. Moruzzi 1, Pisa 56124, Italy ' TeCIP Institute, Scuola Superiore Sant'Anna, Via G. Moruzzi 1, Pisa 56124, Italy

Abstract: IEEE 802.11e HCCA reference scheduler is based on fixed value parameters that do not adapt to traffic changes, thus quality of service (QoS) for multimedia applications is a challenge, especially in the case of variable bit rate (VBR) streams, that requires dynamic resource assignment. This paper is focused on immediate dynamic TXOP HCCA (IDTH) scheduling algorithm and its new evolution immediate dynamic TXOP HCCA plus (IDTH+). Their reclaiming mechanisms, refined by the monitoring of transmission duration, aim at overcoming the limits of fixed preallocation of resources by varying the stations transmission time and avoiding waste of resources. Simulations and theoretical analysis based on the imprecise computation model show that the integration of IDTH and IDTH+ can achieve improved network performance in terms of transmission queues length, mean access delay and packets drop rate, and to efficiently manage bursty traffic. Moreover, the performance improvements of IDTH+ with respect to IDTH are highlighted.

Keywords: QoS; quality of service; scheduling algorithms; WLAN; wireless LANs; local area networks; IEEE 802.11e networks; imprecise computation; multimedia applications; simulation; network performance; transmission queue length; access delay; packet drop rate; bursty traffic.

DOI: 10.1504/IJAHUC.2016.079262

International Journal of Ad Hoc and Ubiquitous Computing, 2016 Vol.23 No.3/4, pp.152 - 167

Received: 30 Oct 2014
Accepted: 15 Jun 2015
Published online: 26 Sep 2016 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article