Abstract
WLAN MAC layer implements Point Coordination Function (PCF) for real-time traffic. The polling overhead and null packets wasted bandwidth when the polled station has no data to send. To increase the channel utilization and reduce the delay of real-time packets, presents a modified polling scheme. Adaptive polling scheme adopts a dynamic polling list to reduce unnecessary Polls and Null packets, and uses moredata list with extended PCF scheme to utilize the remaining CFP. Unpolled station utilizes real-time uplink protocol to transmit real-time multimedia packets in CP. Simulations show that the proposed scheme reduces the poling overhead and the delay of real-time traffic, and improve the throughput of real-time traffic.
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