A Scheme of IEEE 802.11e HCCA Polling and Queue Management for Bandwidth Guarantee per Session

Young-Hwan KIM  Jung-Bong SUK  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.6   pp.1680-1689
Publication Date: 2011/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1680
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
quality-of-service,  bandwidth guarantee,  multimedia transmission,  IEEE 802.11e HCCA,  

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Video applications such as video conferencing among multiple users and video surveillance systems require multiple video connections and QoS guarantee. These days the video systems equipped with IEEE 802.11 LAN interfaces allows a broadband wireless access to the Internet at a reasonable price. However, according to the current IEEE 802.11e HCCA standard, if more than two video sessions are to be established simultaneously, some of them must share the TXOP because the available number of TSIDs for video transmission is restricted to two. In order to resolve this problem, we devise a scheme which can establish up to 13 video sessions by slightly modifying the frame structure while maintaining the compatibility with the current standard. Our scheme is implemented on the NCTUns 4.0 network simulator, and evaluated numerically in terms of throughput, delay, and PSNR. Also real video clips are used as input to our simulation. The results showed that our scheme guarantees the transmission bandwidth requested by each video session.