Network architecture and performance evaluation of broadband satellite systems

Summary form only given. Satellites are unique components of communication systems that possess singular properties. Some of these properties breadth of broadcast 'reach', ubiquitous access, low-cost global coverage, large capacity, etc. represent significant advantages. Some others such as propagation delay, and wireless channel quality are disadvantages. For broadband access in particular, satellites offer substantial bandwidth that can support transmission at Gbps rates. At the same time, significant difficulties arise at these rates that stem mainly from the delay and error characteristics of the satellite channel. In a network environment these characteristics impact adversely some of the broadband network protocols from ATM to TCP and the network security. We outline three particular examples of services well suited for broadband satellite systems: asymmetric TCP/IP to support Internet applications via satellite; multicast over satellite; and Web page caching.