Theoretical Maximum Throughput of IEEE 802.11 and its Applications
NCA '03 Proceedings of the Second IEEE International Symposium on Network Computing and Applications
IQU: practical queue-based user association management for WLANs
Proceedings of the 12th annual international conference on Mobile computing and networking
Understanding congestion in IEEE 802.11b wireless networks
IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement
Active Queue Management for Fair Resource Allocation in Wireless Networks
IEEE Transactions on Mobile Computing
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High concentration of users in a cell of a wireless LAN leads to an unsustainable traffic load at the access point (AP). An unsuitable solution to the problem will cause poor connectivity for users, severe performance degradation, and possible collapse of the wireless LAN. In this paper, we present a scheduler based on queue length at the AP and a congestion control scheme based on the channel utilization. The traffic flows can be scheduled proportionally to their backlogged queue length while meeting their QoS requirements. The traffic flows that have a higher aggregate rate are more probabilistic to be selected. This policy leads to a fair bandwidth allocation of the total bandwidth. Link utilization is used as a congestion indicator and is informed to the sender to adjust its transmission rate, hence realize congestion control. The link utilization is computed by the channel occupying time in a given time period. The simulation results verify our analysis that our scheduler and congestion control scheme can allocate the bandwidth with considerable fairness.