The satellite network does not have the IP layer where the IPsec [2][3] is designed for. Therefore, a new algorithm is needed to secure the satellite link at link layer or physical layer. This paper will give a short analysis on the advantages and disadvantages of the MPEG-2 TS encryption and present an approach trying to use the extension header of Unidirectional Lightweight Encapsulation (ULE...

Satellites using the Ka band are capable of providing high capacity data communications links. It is very likely that much of this data traffic will use the TCP/IP suite of protocols. This paper focuses on the performance of the TCP protocol [Pos81], which is used for reliable, connectionoriented transfer of information. Since TCP will interpret a bit error introduced dur ing a link fade as an ...

Communication satellites have been in commercial use for more than three decades. Driving their early deployment were military communications , international telephony, and broadcast TV. Now these same satellites are being used to transport TCP/IP traffic between distant locations , and to offer Internet access. Satellites have thus become the celestial link of the global Internet, an " instant...

This paper describes the issues that arise when using satellites for IP multicast, with the emphasis on multicast protocols and how their implementation depends on the satellite communications platform. Various link layer standards such as DVB-S, DVB-RCS and ATM can be used in satellites with onboard processing, and applied to meet user and network requirements for IP multicast. The paper provi...

This paper presents some of the results of a study aimed at investigating and optimizing possible Interference Mitigation techniques for wideband fixed-service satellite systems. In particular this paper discusses the performance improvements that can be achieved in the user-to-Hub link (Reverse-Link, RL) of a multibeam satellite system by using more advanced processing techniques than those im...

Satellite communication systems are the means of realizing a global broadband integrated services digital network. Due to the statistical nature of the integrated services tra c, the resulting rate uctuations and burstiness render congestion control a complicated, yet indispensable function. The long propagation delay of the earth-satellite link further imposes severe demands and constraints on...

Studies have shown that packet reordering is common, especially in satellite networks where there are link level retransmissions and multipath routing. Moreover, satellite networks exhibit high corruption rates causing packet losses. Reordering and corruption of packets decrease the TCP performance of a network, mainly because it leads to overestimation of the congestion in the network. We cons...

Satellite networks have signi cant advantages over terrestrial networks. Satellites provide unique advantages such as remote coverage with rapid deployment, distance insensitivity, bandwidthon-demand, immunity to terrestrial disasters, o ering broadband links. Broadband satellite networks will play an important role in the rapidly evolving information infrastructure. However, there are several ...