High performance IP multicasting over wireless satellite-Terrestrial networks (original) (raw)

An architecture for Internet service via broadband satellite networks

International Journal of Satellite Communications, 2001

High bandwidth satellites hold out the promise of a rapidly deployable communications infrastructure with a natural support for mobility. However, the Transmission Control Protocol, widely used in the Internet, performs poorly over satellite links, and this presents an obstacle to the deployment of such systems. We present an architecture that overcomes these problems and provides an approach to building complex heterogeneous networks from simple units. We also present some results from our initial implementation, which uses TCP connection splitting to improve TCP performance over satellite links.

Effective extensions of Internet in hybrid satellite-terrestrial networks

AIP Conference Proceedings, 1996

DirecPC™'s Turbo Internet is a low-cost hybrid (satellite-terrestrial) high-speed digital transmission system developed as a collaborative effort between the Center for Satellite and Hybrid Communication Networks and Hughes Network Systems. The system uses receive-only VSAT satellite links for downstream data delivery and public telephone networks at modem speeds to provide the upstream communications path. One of the services provided is high speed Internet access based on an asymmetric TCP/IP protocol. In the initial protocol implementation, we achieved four times higher throughput than that of today high-speed modems (28.8 Kbps) alone (Falk 1995). This throughput can be further enhanced. The mismatch in bandwidth and delay in this hybrid network prevents the full use of the satellite link bandwidth (1 Mbps). This paper presents two techniques, TCP spoofing and selective acknowledgment dropping, which significantly increase the overall throughput of the hybrid network. Our approach does not require any modification to the TCP/IP protocol stacks on the end hosts. The solutions proposed in this paper could be used to improve TCP/IP performance of other hybrid networks which have the disadvantage of high bandwidth-delay products and/or low bandwidth return paths.

Internet service via broadband satellite networks

Multimedia Systems and Applications, 1999

The demand for Internet bandwidth has grown rapidly in the past few years. A new generation of broadband satellite constellations promise to provide high speed Internet connectivity to areas not served by optical fiber, cable or other high speed terrestrial connections. However, using satellite links to supply high bandwidth has been difficult due to problems with inefficient performance of the Internet's TCP/IP protocol suite over satellite. We describe an architecture for improving the performance of TCP/IP protocols over heterogeneous network environments, especially networks containing satellite links. The end-to-end connection is split into segments, and the protocol on the satellite segment is optimized for the satellite link characteristics. TCP congestion control mechanisms are maintained on each segment, with some coupling between the segments to produce the effect of end-to-end TCP flow control. We have implemented this design and present results showing that using such gateways can improve throughput for individual connections by a large factor over paths containing a satellite link.

Multimedia satellite networks and TCP/IP traffic transport

2001

ABSTRACT To meet an increasing demand for multimedia services and electronic connectivity across the world, satellite networks will play an indispensable role in the deployment of global networks. A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constellations operating in the Ka-band and above.

Broadband Satellite Communications for Internet Access

2004

Part Two , consisting of chapters 6-9, addresses major technical challenges in designing and deploying satellite IP, ATM, and future MPLS networks. The emphasis is on the link layer and above. The physical layer details have been addressed extensively in the literature. The first three chapters of this part deal with technical challenges at various layers. The physical layer, link layer-media access are covered in Chapter 6; satellite IP at network layer, satellite TCP at transport layer with Performance Enhancing Proxies (PEPs) in Chapter 7; and satellite ATM with traffic management and congestion control and end-to-end security in Chapter 8. Chapter 9 provides a current status of standards and regulatory issues for satell ite networks. After descr ibing an overview of the principles of satellite networks and technical challenges for satellite network design in Part One and Part Two, a detailed description of satellite IP networks achieving QoS guarantees and performance is illustrated in Part Three. The purpose of this part is to provide satellite IP networks QoS performance models giving an understanding of the design aspects to be addressed for realization of a satellite network. In Chapter 10, QoS in satellite IP, QoS objectives, QoS architecture alternatives are discussed. Differentiated Services based QoS simulation models for TCP and User Datagram Protocol (UDP) traffic for Geostationary Earth Orbit (GEO) and Medium Earth Orbit (MEO) configurations using Analysis of Variation Techniques are provided in Chapter 11. In Chapter 12, performance of MPLS over a satellite network is described. Interactive multimedia over satellite using Multiple Frequency-Time Division Multiple Access (MF-TDMA) based and Code Division Multiple Access (CDMA) based return channel protocols are presented in chapter 13. Similar to the discussion on satellite IP performance models in Part Three , Part Four addresses satellite ATM networks identifying fundamental questions about buffer requirements, TCP/ATM , efficiency and fairness and multiple access modes in a quantitative way. This part is dedicated to simulation analysis of TCP performance and resulting QoS operating over satell ite links. Several proposals for improvements are compared. Chapter 14 provides QoS requirements for satellite ATM networks , and a simulation model for satellite ATM Unspecified Bit Rate (UBR) service. Chapter 15 develops a simulation model for TCP over satellite ATM for GEO, MEO and Low Earth Orbit (LEO) configurations. An analytical model for satellite ATM based Time Division Multiple Access/Demand Assignment Multiple Access (TDMA /DAMA) slot allocation for Constant Bit Rate (CBR) services is presented in Chapter 16.

Transport protocols in multicast via satellite

International journal of …, 2004

In a wide variety of broadband applications, there is a need to distribute information to a potentially large number of receiver sites that are widely dispersed from each other. Communication satellites are a natural technology option and are extremely well suited for carrying such services because of the inherent broadcast capability of the satellite channel. Despite the potential of satellite multicast, there exists little support for multicast services over satellite networks. Although several multicast protocols have been proposed for use over the Internet, they are not optimized for satellite networks. One of the key multicast components that is affected when satellite networks are involved in the communication is the transport layer. In this paper, we attempt to provide an overview of the design space and the ways in which the network deployment and application requirements affect the solution space for transport layer schemes in a satellite environment. We also highlight some of the issues that are critical in the development of next generation satellite multicast services.

Satellite-based Internet: a tutorial

IEEE Communications Magazine, 2001

In a satellite-based Internet system, satellites are used to interconnect heterogeneous network segments and to provide ubiquitous direct Internet access to homes and businesses. This article presents satellite-based Internet architectures and discusses multiple access control, routing, satellite transport, and integrating satellite networks into the global Internet.

IP multicast via satellite: a survey

2002

Many of the emerging applications in the Internet, such as tele-conferencing, distance-learning, distributed games, software updates, and distributed computing would benefit from multicast services.