Optimization of IEEE 802.11e MAC protocol performance is done by modifying several parameters left open in the standard, like buffer size and acknowledgement policies. By using the developed event-driven simulator, results were extracted with single and multi-service. With only a single service, higher values for the goodput are obtained for video and background (BK) traffics in comparison with the voice (VO) application. Besides, the number of supported user is higher for voice. With mixtures of traffic, when the number of station is small the goodput is lower for VO. However, for higher number of station, the lowest values for the goodput occur for background traffic. By using the Block Acknowledgement (ACK) procedure, for video and BK traffics, the capacity is improved when the number of station is equal or higher than 16 and 12, respectively. From a detailed analysis of the video application, a reduction of more than 40% was achieved in the delay. However, a clear trend is not identified for the optimum block size.
[1]
O. Cabral,et al.
QoS Metrics for Cross-Layer Design and Network Planning for B3G Systems
,
2006,
2006 3rd International Symposium on Wireless Communication Systems.
[2]
Qiang Ni,et al.
Performance analysis and enhancements for IEEE 802.11e wireless networks
,
2005,
IEEE Network.
[3]
Markus Dillinger,et al.
Investigation of radio resource scheduling in WLANs coupled with 3G cellular network
,
2003,
IEEE Commun. Mag..
[4]
A. M. Abdullah,et al.
Wireless lan medium access control (mac) and physical layer (phy) specifications
,
1997
.
[5]
Sunghyun Choi,et al.
Goodput enhancement of IEEE 802.11a wireless LAN via link adaptation
,
2001,
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240).
[6]
Orlando Cabral,et al.
Event-Driven Simulation for IEEE 802.11e Optimization
,
2008
.