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Efficient Delivery of Multimedia Traffic Using Muti-rate Transmission of 802.11e HCCA MAC Protocol  

Kim, Young-Hwan (연세대학교 컴퓨터정보통신공학부 정보통신망연구실)
Suk, Jung-Bong (연세대학교 컴퓨터정보통신공학부 정보통신망연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.4B, 2008 , pp. 192-198 More about this Journal
Abstract
In this paper, we propose a scheme that improves the transmission performance of realtime multimedia data in wireless Local Area Network (LAN) environment, through the dynamical control of Transmission Opportunity (TXOP) period of the IEEE 802.11e HCCA Medium Access Control (MAC). The existing schedulers which determine the frame transmission time and its duration could not appropriately cope with the change of physical transmission rate, since the TXOP period has remained unchanged with the change of transmission rate of the wireless station. Our scheme is devised to keep the transmission performance of real-time multimedia data effectively unchanged by making TXOP period be extended when the transmission rate gets reduced. The proposed scheme is experimented along with IEEE 802.11e reference model using NCTUns simulator, which shows that the multimedia data is effectively delivered with the change of transmission rate as the distance between the wireless station and its access point increases.
Keywords
IEEE 802.11e MAC; QoS; HCCA; TXOP; Multi-Rate;
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  • Reference
1 D. Gao, J. Cai, and L. Zhang, 'Physical Rate-Based Admission Control for HCCA in IEEE 802.11e WLANs,' in Proc. of the IEEE 19th Int'l. Conf. Adv. Info. Net. and Apps., Taiwan, Mar. 2005
2 IEEE Std 802.11e Std., 'Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications / Amendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band,' June 2003
3 ITU-T Recommendation G.711, 'Pulse Code Modulation (PCM) of Voice Frequency,' Nov. 1988
4 ANSI/IEEE Std 802.11 [ISO/IEC 8802-11: 1999(E)], 'Part 11: Wireless LAN MAC and PHY Specifications,' LAN/MAN Standards Committee of the IEEE Computer Society, 1999 Edition
5 IEEE Std 802.11e Std., 'Part 11: Medium Access Control (MAC) Enhancements for Quality of Service (QoS),' Jan. 2005
6 M. Lacage, M. H. Manshaei, and T. Turletti, 'IEEE 802.11 Rate Adaptation: A Practical Approach,' in Proc. of MSWiM'04, Venezia, Italy, Oct. 2004
7 NCTUns, http://nsl.csie.nctu.edu.tw/nctuns.html