Enhanced CAC with QoS Scheme for Improving the Efficiency of Resource Allocation on the IEEE 802.16 Network

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 802.16 network. First, SS has to send connection request to BS before it is ready to transmit data. Then, SS can be allowed to transmit data white 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 802.16 PMP mode. Hence, we use QualNet tool to perform some experiments, simulation results indicate that the proposed ECQ scheme can obtain lower CBP about 17.1% and higher Packet Arrival Ratio and Total Packets Received about 19.16% 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 on the IEEE 802.16 network.