Living in the Information Age means that the more information is generated, the more new information is required. A large contributor to the rapid increase of new information and its ease of accessibility is the Internet. The backbone of the Internet is the TCP Internet protocol. New emerging network technology, ATM, achieves data throughput never before possible. Layering TCP/IP over ATM will increase throughput performance that TCP/IP could not achieve alone. With the growing desire to use satellites as a medium for the Internet as well as the large amounts of digitized communication that already occurs daily via satellites, the TCP/IP proposes to become a standard for satellite communication. The high data rates of ATM, however, is very appealing for use on satellite links in an effort to make them more cost effective. Obstacles exist which prevent TCP/IP over ATM in its current state from becoming an efficient way to send information to and from satellites. This paper looks at the unique challenges of networking via satellite links, discusses the impact of the satellite links on TCP/IP over ATM and the limitations of TCP/IP which are caused, and investigates solutions to these limitations.
Asynchronous Transfer Mode (ATM) Quality of Service (QoS) experiments using the Transmission Control Protocol/Internet Protocol (TCP/IP) were performed for various link delays. The link delay was set to emulate a Wide Area Network (WAN) and a Satellite Link. The purpose of these experiments was to evaluate the ATM QoS requirements for applications that utilize advance TCP/IP protocols implemented with large windows and Selective ACKnowledgements (SACK). The effects of cell error, cell loss, and random bit errors on throughput were reported. The detailed test plan and test results are presented herein. Frantz, Brian D. and Ivancic, William D. Glenn Research Center NASA/TM-2001-209644, E-11990, NAS 1.15:209644
Gain the knowledge needed to execute end-to-end performance analysis over satellite links and networks, evaluate throughput and capacity over satellite systems, and understand IP/ATM over SATCOM issues and limitations with this in-depth, practical resource. The book examines current and future land mobile satellite (LMS) communication systems, and the techniques necessary to support reliable and efficient communication.
Gain an in-depth understanding of performance issues central to the planning, designing, and efficient operation of TCP/IP over ATM networks with this practical new book. Containing information essential to solving internetworking problems between TCP/IP and ATM networks, this book helps you guarantee quality of service for ATM applications and understand the enhancements required to run TCP over wireless links.
A scientific overview of current and future satellite systems for mobile and broadband communications. In part I, the fundamentals of geostationary and non-geostationary satellite constellations and the related questions of communications technology are treated. Part II deals with satellite systems for mobile communications and treats several network features as well as their technology, regulation and financing. Part III is devoted to future satellite systems for broadband communications and explains the specialities of satellite communications, particularly on the basis of ATM and TCP/IP. An extensive survey on operating and planned satellite systems completes the book.
To assist in the design and understanding of future global networks, this paper describes the practical and simulation experiences gained from a TCP/IP on ATM network over a high speed satellite link and presents performance comparison studies of such networks with the same host/traffic configurations over local area (LAN) and wide area (WAN) networks. It was found that the satellite systems deliver performance similar to the terrestrial networks regardless their path latencies in cases where the communication channels exhibit a low bit error rate (BER). NASA's Advanced Communications Technology Satellite (ACTS), with its special characteristics and high data rate satellite channels, and the ACTS ATM Internetwork (AAI) were used in these experiments to deliver broadband traffic. Network performance tests were carried out using application-level software (ttcp, Netspec) on OC-3 and OC-12 ATM satellite links.
Consumers want it, businesses are demanding it. The migration of Internet services to a mobile environment is inevitable. But while the ability to be on the go and connected to the Internet sets the stage for increased efficiency and productivity, many technical challenges associated with user mobility and wireless connectivity remain. Mobil
Demand for Mobile Satellite Service (MSS) is on the increase, with a huge surge of interest in mobile communications in recent years and high-paced advancements in the supporting system architectures, devices and applications. This thoroughly revised and updated book provides a comprehensive guide to the MSS technologies and emerging trends. It takes a system level approach, giving in-depth treatment of technical and business related issues. The author, a leading professional in the area, draws on his extensive experience in industry and research, to provide the reader with a sound and informed understanding of the technology. Mobile Satellite Communications includes introductory material for the reader new to the field, in addition to exploring prevalent system concepts, architecture, practices and trends for the more experienced. An in-depth review of scientific principles merged with business models and regulatory considerations presents a balanced perspective of commercial mobile satellite systems. This book will be of interest to practicing engineers in mobile satellite communications and mobile broadcasting, research and development professionals working in these areas, mobile satellite service providers and operators. Academics and students studying satellite systems/technology, specialists in other classes of satellite systems, technical and marketing managers, strategists and planners of telecommunication systems: individuals interested in mobile communications, satellite and telecommunications/broadcasting technology will also find this book insightful. Key Features: Comprehensive treatment of mobile satellite communications topics, including radio link aspects, satellite constellations, architectural and operational aspects, as well as business planning models, MSS radio interface standards, spectrum forecast methodologies and system examples. Addresses related themes such as mobile broadcasting, mobile VSATs, search and rescue, and navigation systems. Introduces emerging technologies such as mobile broadband, television broadcasting to handheld units, advanced capacity enhancement techniques, hybrid system architecture concepts, including a rich sample of research topics such as multiple input multiple output, satellite-based ad-hoc networks, and highlights initiatives in the use of Q/V frequency bands. Includes revision questions at the end of each chapter. An accompanying website for interaction (www.satellitesandyou.com).
