tailieunhanh - Báo cáo hóa học: " Research Article Adaptive Bandwidth Management and Joint Call Admission Control to Enhance System Utilization"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Adaptive Bandwidth Management and Joint Call Admission Control to Enhance System Utilization | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 34378 11 pages doi 2007 34378 Research Article Adaptive Bandwidth Management and Joint Call Admission Control to Enhance System Utilization and QoS in Heterogeneous Wireless Networks Olabisi E. Falowo and H. Anthony Chan Department of Electrical Engineering University ofCape Town Private BagX3 Rondebosch 7701 South Africa Received 30 May 2007 Accepted 18 September 2007 Recommended by Athanasios V. Vasilakos The coexistence of different cellular networks in the same area necessitates joint radio resource management for enhanced QoS provisioning and efficient radio resource utilization. We propose adaptive bandwidth management and joint call admission control JCAC scheme for heterogeneous cellular networks. The objectives of the proposed adaptive JCAC scheme are to enhance average system utilization guarantee QoS requirements of all accepted calls and reduce new call blocking probability and handoff call dropping probability in heterogeneous wireless networks. We develop a Markov chain model for the adaptive JCAC scheme and derive new call blocking probability handoff call dropping probability and average system utilization. Performance of the proposed adaptive JCAC scheme is compared with that of nonadaptive JCAC scheme in the same heterogeneous wireless network. Results show an improvement in average system utilization of up to 20 . Results also show that connection-level QoS can be significantly improved by using the proposed adaptive JCAC scheme. Copyright 2007 O. E. Falowo and H. A. Chan. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The coexistence of different cellular networks in the same geographical area necessitates joint radio resource management JRRM for .