tailieunhanh - Báo cáo hóa học: " Adaptive QoS Routing by Cross-Layer Cooperation in Ad Hoc Networks"

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: Adaptive QoS Routing by Cross-Layer Cooperation in Ad Hoc Networks | EURASIP Journal on Wireless Communications and Networking 2005 5 661-671 2005 H. Sun and H. D. Hughes Adaptive QoS Routing by Cross-Layer Cooperation in Ad Hoc Networks Hongxia Sun Department of Computer Science University of Calgary Calgary AB Canada T2N1N4 Email sunh@ Herman D. Hughes Computer Science and Engineering Department Michigan State University East Lansing MI 48824-1027 USA Email hughes@ Received 30 June 2004 Revised 8 April 2005 QoS provisioning is a complex and challenging issue in mobile ad hoc networks especially when there are multiple QoS constraints. In this paper we propose an adaptive QoS routing scheme supported by cross-layer cooperation in ad hoc networks. The cross-layer mechanism provides up-to-date local QoS information for the adaptive routing algorithm by considering the impacts of node mobility and lower-layer link performance. The multiple QoS requirements are satisfied by adaptively using forward error correction and multipath routing mechanisms based on the current network status. The complete routing mechanism includes three parts 1 a modified dynamic source routing algorithm that handles route discovery and the collection of QoS-related parameters 2 a local statistical computation and link monitoring function located in each node and 3 an integrated decision-making system to calculate the number of routing paths coding parity length and traffic distribution rates. Simulation results are presented to illustrate the overall performance of our scheme. Our results indicate that our adaptive routing scheme provides suitable QoS performance that is less sensitive to network conditions . node mobility transmission power channel characteristics and the traffic pattern than a nonadaptive routing strategy. Keywords and phrases QoS routing ad hoc network multiple path end-to-end delay packet loss. 1. INTRODUCTION A wireless ad hoc network consists of a collection of mobile nodes interconnected by multihop .