Results 181 to 190 of about 17,173,245 (311)

Routing and Downlink Resource Allocation for Multicast Traffic in LEO Satellite Constellations

open access: yesInternational Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT In this work, we optimize unicast and multicast traffic delivery over non‐terrestrial networks (NTNs) to users on the ground through direct satellite downlink (DL). We consider a gateway‐free mesh architecture with low Earth orbit (LEO) satellites interconnected via inter‐satellite links (ISLs), where unicast and multicast services compete for
Federico Lozano‐Cuadra   +3 more
wiley   +1 more source

Long‐Term Propagation Measurements in Madrid in a Q‐Band Satellite‐to‐Earth Link

open access: yesInternational Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT The Q/V band (40/50 GHz) is gaining interest as satellite operators will need larger bandwidth to be able to provide their services, which are experiencing an increasingly high demand. An accurate characterization of the satellite‐to‐Earth propagation channel is of paramount importance to guarantee a high level of quality of service, by ...
Domingo Pimienta‐del‐Valle   +3 more
wiley   +1 more source

Restoring End‐to‐End Transport With QUIC on Satellite Paths

open access: yesInternational Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Slow Start is a key congestion control mechanism used to assure a safe response to overload of a path across the Internet. This mechanism increases the startup time taken by the sender to reach the capacity available across the path. The benefit becomes significant on paths with a high bandwidth‐delay product.
Matthias Hofstätter   +5 more
wiley   +1 more source

Uncertainty Characterization Framework for Machine Learning Based ACM in Q‐Band Satellite Links

open access: yesInternational Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Adaptive coding and modulation (ACM) is a widely utilized technique in satellite communication networks to mitigate the adverse effects of rain fades, particularly in extremely high frequency (EHF) bands. As a core component of fade mitigation techniques (FMTs), ACM improves signal resilience.
Kamolideen Abolarinwa   +3 more
wiley   +1 more source

Assessments as Sites for Teacher Sensemaking About Epistemic Learning Goals in Science

open access: yesScience Education, EarlyView.
ABSTRACT Recent science education reforms aim to broaden allowable ways of knowing and learning in science classes. Doing so requires that we attend to and work to shift messages about useful ways to know and learn (i.e., epistemological messages) embedded in course designs and enactments.
Lindsay B. Wells   +2 more
wiley   +1 more source

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