Scalable and Robust WLAN Connectivity Using Access Point Array
DSN '05 Proceedings of the 2005 International Conference on Dependable Systems and Networks
An evaluation of media-oriented rate selection algorithm for multimedia transmission in MANETs
EURASIP Journal on Wireless Communications and Networking
Fairness and load balancing in wireless LANs using association control
IEEE/ACM Transactions on Networking (TON)
Throughput Measurement-Based Access Point Selection for Multi-rate Wireless LANs
WASA '09 Proceedings of the 4th International Conference on Wireless Algorithms, Systems, and Applications
Performance evaluation of multi-rate communication in wireless LANs
CCNC'10 Proceedings of the 7th IEEE conference on Consumer communications and networking conference
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IEEE802.11 wireless LAN system has several transmission rates (multi-rate).The appropriate rate should be chosen to obtain maximum Quality of Service (QoS) such as throughput. The throughput is determined by two factors; one is retransmission delay and the other is "carrier busy" waiting time. A previous research reveals that the appropriate rate should be changed in stepwise by the discrete distances between an access point (AP) and terminals with considering only the retransmission. Although it could be useful when no interferences cause carrier busy, the interferences from noise and other systems such as other wireless LANs must be considered in real situations. Therefore, this paper investigates how much the interferences affect the throughput by using real access points and terminals as well as the retransmission. Experimental results in various situations such as in indoors, in outdoors and in radio-shielded boxes are compared to show quantity evaluation of "carrier busy" waiting time. The results indicate that quite large portion of throughput degradation in outdoors is caused by "carrier busy" waiting time. For proposing and evaluating QoS control in wireless LAN, for example, AP assignment control, such large interferences should be taken account of to achieve more precise effects.