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This paper describes the main aspects relevant to the development of a third-generation radio transmission technology (RTT) concept identified as satellite wide-band CDMA (SW-CDMA), which has been accepted [1] by the International Telecommunications Union (ITU) as one of the possible RTTs for the satellite component of International Mobile(More)
ESA Satlabs proposed a splitting architecture, named Interoperable-Performance Enhancing Proxy (I-PEP), which defines a protocol stack for the edges of a Digital Video Broadcasting-Return Channal over Satellite (DVB-RCS) link with the aim of improving performance of Transmission Control Protocol (TCP)-based applications. At the transport layer of I-PEPs,(More)
Designing efficient transmission mechanisms for advanced satellite networks is a demanding task, requiring the definition and the implementation of protocols and architectures well suited to this challenging environment. In particular, transport protocols performance over satellite networks is impaired by the characteristics of the satellite radio link,(More)
Several satellite systems currently in operation or under development claim to support broadband Internet applications. In these scenarios, TCP plays a critical role. Unfortunately, when used with satellite links, TCP suffers from a number of well-known performance problems, especially for higher data-rates and high altitude satellites with longer delays.(More)
The utilization of high frequencies, such as Ka-band and beyond, necessary to avoid the highly congested lower satellite frequencies and to get larger bandwidth availability is considered for many developing satellite systems. The new satellite low-margin systems in Ka-band will need to be designed using fade countermeasures to counteract rain attenuation.(More)
This paper is not a survey related to generic wireless sensor networks (WSNs), which have been largely treated in a number of survey papers addressing more focused issues; rather, it specifically addresses architectural aspects related to WSNs in some way connected with a satellite link, a topic that presents challenging interworking aspects. The main(More)
The recent European Telecommunications Standards Institute (ETSI) decision to endorse for the Universal Telecommunication Radio Access ??? (UTRA) techniques based upon wideband-CDMA approaches for terrestrial UMTS (T-UMTS) paired frequency duplexing band will certainly constitute an important driver to orientate the corresponding choice for the satellite(More)
In future generation communication systems, integration among different segments (terrestrial indoor, terrestrial outdoor and satellite) will be necessary if aiming at providing real global and contiguous coverage without interruption. To achieve integrated or interworking systems efficient algorithms to perform intersegment handover (ISHO) must be(More)
Transmission Control Protocol is the layer 4 protocol over which over 90% of the Internet applications are based. The high latency peculiar of satellite links causes severe degradation of performance, especially if high bandwidth is available. In fact, due to the high Bandwidth Delay Product the pipe requires a long time to fill. To counteract such(More)