tailieunhanh - Báo cáo hóa học: " Position-Based Relaying with Hybrid-ARQ for Efficient Ad Hoc Networking"

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: Position-Based Relaying with Hybrid-ARQ for Efficient Ad Hoc Networking | EURASIP Journal on Wireless Communications and Networking 2005 5 610-624 2005 B. Zhao and M. C. Valenti Position-Based Relaying with Hybrid-ARQ for Efficient Ad Hoc Networking Bin Zhao Lane Department of Computer Science and Electrical Engineering College of Engineering and Mineral Resources West Virginia University Morgantown WV26506-6109 USA Email bzhao@ Matthew C. Valenti Lane Department of Computer Science and Electrical Engineering College of Engineering and Mineral Resources West Virginia University Morgantown WV26506-6109 USA Email mvalenti@ Received 15 June 2004 Revised 3 January 2005 This paper presents and analyzes an integrated cross-layer protocol for wireless ad hoc networking that utilizes position location . through an onboard GPS receiver and jointly performs the operations of network-layer relaying and link-layer ARQ-based error control. The protocol is a modified version of the hybrid-ARQ-based intra-cluster geographically-informed relaying HARBINGER protocol 2005 and unifies the concepts of geographic random forwarding GeRaF 2003 point-to-point hybrid-ARQ 2001 and cooperative diversity 2004 . The modification makes the protocol especially suitable for sensor networks whose nodes cycle in and out of sleep states and permits a closed-form analysis. Performance bounds and simulations indicate the potential for a dramatic improvement in the tradeoff between active node density and end-to-end message delay as compared with the GeRaF protocol and are used to motivate further study of practical implementation issues. Keywords and phrases relay networks ad hoc networking cross-layer protocols hybrid-ARQ GeRaF HARBINGER. 1. INTRODUCTION Wireless ad hoc networks in general and sensor networks in particular must be energy efficient and able to deliver messages with low latency. One way to improve the energylatency tradeoff is to exploit the inherent spatial diversity that arises when multiple relay nodes are within transmission .