On - Demand Multiple
نویسندگان
چکیده
Title of Thesis: ON-DEMAND MULTIPLE ACCESS FOR NEXTGENERATION NASA MISSIONS Degree candidate: Lin Lin Degree and year: Master of Science, 2001 Thesis directed by: Dr. Michael Hadjitheodosiou Dr. John S. Baras Department of Electrical and Computer Engineering There is considerable interest at this time in developing small satellites for quick-turnaround missions to investigate near-earth phenomena from space. The aim of the thesis is to investigate issues related to the migration from current Pre-planned Multiple Access operation mode to the next generation on-demand mode focusing on spacecraft in near earth orbits. In this thesis, an evolutionary on-demand mode network architecture is proposed. One of the most important design issues is the development of medium access control (MAC) schemes. For this new scenario, to meet the objective of the bandwidth-efficient support while guaranteed specific QoS requirements, a detailed investigation of the suitability of the MAC schemes is performed. Performance measures of interest include end-to-end delay, successful throughput and channel efficiency. The general protocol investigation framework is first given. Reservation-based Demand TDMA protocol is proposed for the dynamic LEO scenario. Performance evaluations are performed by means of simulation. We compare the system’s performance under Reservation-based demand-assigned multiple-access channel allocation schemes with that obtained under fixed-assigned scheme. Simulation results demonstrate that on-demand mode is a suitable strategy for next-generation NASA space mission with unpredictable traffic pattern, and can offer certain performance advantages. ON-DEMAND MULTIPLE ACCESS FOR NEXT-GENERATION NASA MISSIONS by Lin Lin Thesis submitted to the Faculty of the Graduate School of the University of Maryland, College Park in partial fulfillment Of the requirements for the degree of Master of Science 2001 Advisory Committee: Professor John S. Baras, Chair Professor Evaggelos Geraniotis Dr. Michael Hadjitheodosiou ©Copyright by Lin Lin 2001
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