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Internet of Things (IoT) application layer protocols are gaining popularity in a wide range of scenarios, where low-cost, low-power or resource constrained devices are present. The most diffused protocols are the Constrained Application Protocol (CoAP) and MQTT. In order to ensure message delivery, CoAP features a retransmission mechanism based on exponential back-off and a finite number of retransmissions,...
Random Access (RA) techniques have been included in the novel DVB-RCS2 standard due to an expected efficiency in addressing SCADA and M2M traffic. Such traffic relies on intermittent sources sending short messages on a periodic time scale. Efficiency is usually assessed in terms of layer-2 packet loss rate without taking into account indirect effects on upper layer protocols. In particular, TCP assumes...
The rapid growth in the demand for Future Internet services with many emerging group applications has driven the development of satellite, which is the preferred delivery mechanism due to its wide area coverage, multicasting capability and speed to deliver affordable future services. Nevertheless, security has been one of the obstacles for both satellite services as well as smart grid group applications,...
Assuring a satisfactory level of Quality of Experience (QoE) to users is nowadays an important challenge for network service providers. At the same time, power consumption minimization is another important issue for network management. Consequently, the ideal goal is to maximize the QoE and, meanwhile, to minimize the power transmitted by network nodes. In telecommunications networks QoE is often...
In this paper we propose a specific beacon receiver structure for the Alphasat TDP#5 Q/Ka band propagation experiment. The main goal of the experiment is to refine the existing propagation models based on the received data from several different geographical locations over Europe, and also to propose new ground station structures for the experimenter's community. The specialty of our receiver that...
This paper discusses the advances and measurement results of a far field test range for SatCom On-the-Move terminals in Ilmenau, Germany. The test range can be operated in Ku and Ka-band, offering a complete emulation of the conditions typically met by a SOTM terminal. Various real-world motion profiles for the Land Mobile and Maritime environment are available for mobile terminal testing. These motion...
Cloud impairments have significant effect on signal propagated in the satellite to land stationary terminals channel at frequencies above 10 GHz. With the recent satellite to land mobile terminals network technologies and services that use these frequencies, there is a lack of channel impairments modeling and analysis for such type of link. This study presents a reliable channel model of satellite-to-land...
Satellite telecommunications today present one of the most remarkable opportunities as they enable us to communicate and virtually reach any corner of the world. Great discoveries and developments in this field have enabled us to improve our quality of life. But even as we benefit from this progress, many challenges are encountered as satellite service providers uphold certain quality of service (QoS)...
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