Packet scheduling and bandwidth allocation based on channel quality in WiMax

Although several studies were conducted on adaptive bandwidth allocation designs for bandwidth requests, previous research on both packet scheduling and bandwidth allocation based on channel quality are relatively limited. This study proposes a two-stage mechanism, called PSBA, to process the operations of packet scheduling and bandwidth allocation based on channel quality information. The service flow simulations in the IEEE 802.16e system indicate that PSBA achieved a lower delay time and a higher throughput among multiple users. For the purpose of performance evaluation, a Markov chain with bulk service was built to analyze the WiMax PMP network based on channel quality. The experimental results revealed that the throughput of PSBA is 21% higher than that of the IEEE 802.16e standard model by using the bandwidth request message (BW-REQ).