| Summary: | 碩士 === 東吳大學 === 資訊管理學系 === 99 === Five service types with different priorities are defined to meet the QoS needs for different users, there are UGS, ertPS, rtPS, nrtPS, and BE on the IEEE 802.16e network. However, the standard does not propose including the method for bandwidth management, Call Admission Control (CAC), and Scheduling. Therefore, a feasible bandwidth allocation algorithm will be very important. First, SS has to send connection request to BS before it is ready to transmit data. Then, SS can be allowed to transmit data while holding the allocated bandwidth from BS. Actually, BS utilizes CAC to identify whether enough bandwidth to serve the new connection requests from SS or not. When the numbers of SS are increasing, the more requests in bandwidth are higher. However, the CAC is to allocate bandwidth in sequence, it may not satisfy the QoS demand. Based on conventional CAC, we propose an enhanced CAC with QoS scheme, called ECQ, to support efficient bandwidth allocation for connection requests of different service types on the IEEE 802.16e PMP mode. Hence, we use QualNet tool to perform some experiments, simulation results indicate that the proposed ECQ scheme can obtain lower Call Blocking Probability (CBP) about 18.15% and higher Packet Delivery Ratio and Total Packets Received about 16.67% and 29.2% than CAC. Finally, the goals of proposed ECQ are to fix the CAC issue that resource is hold by a specified service type and to achieve better performance and QoS guarantee on the IEEE 802.16e network.
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