International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada / The Packet Telemetry Ground Station which receives telemetry data from the Space Station must be able to receive and process various data types including high-rate video, audio, instrumentation, electronic mail, telecommand, and engineering. The Packet Telemetry Ground Station must also be flexible to accommodate changing missions and payloads. Computer simulations of the Packet Telemetry Ground Station provide information about device specifications required to achieve an acceptable level of performance under changing telemetry data traffic configurations. This paper describes a computer simulation model for a Packet Telemetry Ground Station Architecture which was tested using ten different traffic components randomly transmitting data. The Packet Telemetry Ground Station Simulation status and utilization plots are discussed in terms of interpreting the simulation results.

International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, Nevada / In CCSDS File Delivery Protocol (CFDP), four acknowledged modes essentially have an identical protocol for initializing and closing a file delivery. In this protocol, the system occasionally run into a state in which Sender has closed the transaction and Receiver has not closed the transaction. In this paper, we point out the danger of such state being prolonged. Such a state can be prolonged due to link occultation, extremely long propagation delay, or implementation caused by common misinterpretation of the protocol specification. We provide two failure scenarios, which occur in such a state. Then, we discuss ways of preventing such failures.

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published_or_final_version / Electrical Engineering / Master / Master of Science in Engineering

Voice over IP (VoIP) and wireless are revolutionary technologies by all means of modern time which change the attributes of communications dramatically. VoIP has been established as potential alternative to tradition public switched telephone network (PSTN) technology whereas Wireless communication is the most widely used access method where fixed or remote access to network resources is important. Since both technologies have shown their existence in today’s market individually, merger of these technologies was necessary and hence both technologies are being deployed but the question is whether these newly merged combination of technologies will be able to serve up to the same level of expectations and survive in current economic downturn and helps the companies to cut their cost drastically or will be finish with the time. This thesis explores the main factors affecting the deployment of VoIP over Wireless by the telecom operators and its adoption of VoIP over Wireless by Small Medium Enterprises (SMEs) and general consumers. It includes QoS, Security, user behavior, regulations, and last but not least current economic downturn. It would be a difficult task to explain all these issues with regards to the world market in this thesis so throughout our research, European market will be our preliminary focus. First, the thesis will briefly look into the future services, applications and trends which will be beneficial in supporting the growth rate of VoIP over Wireless in near future and then we will investigate all those trouble making factors causing a slow adoption rate of VoIP over Wireless. At the end of the thesis, there will be some proposals and suggestions to improve the growth rate and adoption of VoIP over Wireless

In this thesis we study the problem of road taxation. This problem consists in finding the toll on the roads belonging to the government or a private company in order to maximize the revenue. An optimal taxation policy consists in determining level of tolls low enough to favor the use of toll arcs, and high enough to get important revenues. Since there are twolevels of decision, the problem is formulated as a bilevel bilinear program.

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