Adaptive Packet Scheduling Scheme Based on Network Conditions in WLAN Using Fuzzy System

摘要

The IEEE 802.11n standard has introduced frame aggregation technique which can reduce the overhead and increases the channel utilization efficiency. However, the standard does not address the packet scheduling during the aggregation, and the aggregation scheme causes additional delays, particularly when waiting for other packets in the queue to construct the aggregated frame. Furthermore, the channel status should be addressed to improve the system performance. In this paper, we proposed a scheduling scheme called Dynamic Sensing Mechanism that handles the influence of network channel conditions during the transmission process. The mechanism decreases the number of expired packets during the retransmission by allowing the packets to be transmitted at an earlier time before their expiration time. The simulation results show an outstanding performance improvement for the proposed scheduling mechanism by reducing the packet loss ratio and increasing the system throughput.