tailieunhanh - Báo cáo hóa học: " Modelling and Optimising TinyTP over IrDA Stacks"

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: Modelling and Optimising TinyTP over IrDA Stacks | EURASIP Journal on Applied Signal Processing 2005 1 45-56 2005 Hindawi Publishing Corporation Modelling and Optimising TinyTP over IrDA Stacks A. C. Boucouvalas Microelectronics and Multimedia Communications Research Centre School of Design Engineering and Computing Bournemouth University Fern Barrow Poole Dorset BH12 5BB UK Email tboucouv@ Pi Huang Microelectronics and Multimedia Communications Research Centre School of Design Engineering and Computing Bournemouth University Fern Barrow Poole Dorset BH12 5BB UK Email phuang@ Received 29 March 2004 Revised 20 August 2004 TinyTP is the IrDA transport layer protocol for indoor infrared communications. For the first time this paper presents a mathematical model for TinyTP over the IrDA protocol stacks taking into account the presence of bit errors. Based on this model we carry out a comprehensive optimisation study to improve system performance at the transport layer. Four major parameters are optimised for maximum throughput including TinyTP receiver window IrLAP window and frame size as well as IrLAP turnaround time. Equations are derived for the optimum IrLAP window and frame sizes. Numerical results show that the system throughput is significantly improved by implementing the optimised parameters. The major contribution of this work is the modelling of TinyTP including the low-layer protocols and optimisation of the overall throughput by appropriate parameter selection. Keywords and phrases IrDA TinyTP IrLAP transport layer protocol optimisation. 1. INTRODUCTION Indoor infrared data communications based on the Infrared Data Association IrDA standards have become widely available on a large number of portable devices ranging from mobile phones and digital cameras to laptops and printers 1 . Infrared communication is an excellent choice for effective inexpensive and high-speed short-range wireless communications. The low-level IrDA protocols including physical IrPHY 2 3 link access