naa a22 4500 510791611 CHVBK 20180411083321.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11277-012-0814-0 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0814-0 A Cross-Layer Cognitive Radio-Based Framework and CAC Scheme in WiMAX Networks [Elektronische Daten] [Jinchang Lu, Maode Ma] Quality of service (QoS) provisioning is an important issue in the deployment of broadband wireless access networks with real-time and non-real-time traffic integration. The Connection Admission Control (CAC) operation is essential to guarantee the QoS requirements of connections while achieving system efficiency. Cognitive Radio is seen as a solution to the current low usage of the radio spectrum and the problem of the fixed spectrum allocation. In this paper, we propose a novel cross-layer Cognitive Radio-based QoS support framework and Cognitive Radio-based CAC scheme in WiMAX point-to-multipoint systems. By using a cross-layer approach, the proposed solution can intelligently explore unused spectrums and spread to non-active spectrums to improve the capacity of the system significantly and provide QoS guaranteed service to real-time traffic. A queueing analytical modeling for the WiAMX system has been carried out. The key system performance parameters are obtained based on the queueing analytical model theoretically. Extensive simulation experiments have been carried out to evaluate the performance of our proposal. The simulation results show that our proposed solution can expand the capacity of WiMAX systems up to two times while providing QoS guaranteed service to real-time and non-real-time traffics. Springer Science+Business Media, LLC., 2012 Cross-layer protocol design nationallicence CAC nationallicence QoS nationallicence Congitive radio nationallicence WiMAX nationallicence Lu Jinchang School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore aut Ma Maode School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 255-273 0929-6212 71:1<255 2013 71 11277 https://doi.org/10.1007/s11277-012-0814-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0814-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lu Jinchang School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore aut NATIONALLICENCE 700 1- Ma Maode School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 255-273 0929-6212 71:1<255 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer