tailieunhanh - Báo cáo hóa học: " Distributed admission control protocol for end-toend QoS assurance in ad hoc wireless networks"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Distributed admission control protocol for end-toend QoS assurance in ad hoc wireless networks | Youn et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 163 EURASIP Journal on . http content 20ii i i63 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Distributed admission control protocol for end-to-end QoS assurance in ad hoc wireless networks JooSang Youn1 Sangheon Pack2 and Yong-Geun Hong3 Abstract To reserve end-to-end bandwidth in quality of service QoS supported wireless ad hoc networks local bandwidth requirement should be carefully determined by considering the number of contending nodes in an interference range. In this article we propose a novel admission control protocol called DACP distributed admission control protocol which is implemented over a reactive ad hoc routing protocol with minimal overhead. DACP computes the required bandwidth for end-to-end band-width provision at each node and estimates the available bandwidth at the medium access control layer. After that DACP makes a decision for admitting a flow in a per-hop basis. Extensive simulations are carried out via the OPNET simulator. The simulation results demonstrate that DACP not only provides guaranteed end-to-end resource but also reduces the control overhead to provide QoS support compared with the existing admission control schemes. Keywords admission control ad hoc networks quality-of-service resource reservation 1 Introduction Over the last few years research on quality of service QoS provisioning in wireless ad hoc networks has increased significantly. These networks can be adopted in commercial environments in which there are multimedia systems that enable users to access multimedia data such as IP television and voice over IP VoIP . Moreover these multimedia systems need better service quality than best-effort service. To this end an admission control scheme including resource reservation in wireless ad hoc networks should be devised to support the end-to-end bandwidth demanded by wireless .