Results 131 to 140 of about 4,515,780 (291)

ML‐Assisted Adaptive Fade Mitigation for Satellite Connectivity

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT The demand for reliable and high‐quality wireless networks driven by resource‐intensive applications and services is growing rapidly and invoked the emergence of beyond 5G (B5G) and 6G paradigm and technologies which include satellite systems as part of the nonterrestrial networks (NTN).
Jinwara Surattanagul, Abdulkareem Karasuwa, Kamolideen Abolarinwa, Jonathan Rodriguez, Ifiok Otung   +4 more
wiley   +1 more source

Joint power control and user grouping mechanism for efficient uplink non‐orthogonal multiple access‐based 5G communication: Utilising the Lèvy‐flight firefly algorithm

IET Networks, EarlyView., 2023
We utilise a metaheuristic optimisation method, inspired by nature, called the Lévy‐flight firefly algorithm (LFA), to tackle the power regulation and user grouping in the NOMA systems. Abstract The non‐orthogonal multiple access strategies have shown promise to boost fifth generation and sixth generation wireless networks' spectral efficiency and ...
Zaid Albataineh, Khaled F. Hayajneh, Haythem Bany Salameh, Raed Al Athamneh, Yaser Jararweh   +4 more
wiley   +1 more source

SMTC Configuration and Window Adjustment Strategies for Beam Hopping in NR‐NTN

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Beam hopping is an effective transmission strategy for nonterrestrial networks (NTNs), enabling satellites to allocate limited power and spectrum resources across different geographical regions over time. However, in NR‐based NTN systems, beam hopping complicates synchronization monitoring because synchronization signal block (SSB) arrivals ...
Hee Wook Kim, Kyungrak Lee, Joon Gyu Ryu
wiley   +1 more source

Characterization of Rain Attenuation for Millimeter Wavelengths for Realistic Nonrotational Symmetric Drop Shapes

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT The use of frequencies above 30 GHz (millimeter waves) for communication purposes is nowadays a necessity, both for terrestrial (e.g., 5G/6G) and satellite links. One reason is the need for more bandwidth and the fact that “traditional” frequency bands are already fully occupied.
Franz Teschl, Anđela Šević, Merhala Thurai, Michael Schönhuber   +3 more
wiley   +1 more source

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

International 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, Israel Leyva‐Mayorga, Jimmy Jessen Nielsen, Beatriz Soret   +3 more
wiley   +1 more source

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

International 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, José Manuel Riera, Pedro Garcia‐del‐Pino, Gustavo A. Siles   +3 more
wiley   +1 more source

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

International 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, Raffaello Secchi, Gorry Fairhurst, Tomaso de Cola, Kai‐Steffen Hielscher, Reinhard German   +5 more
wiley   +1 more source

Reliable vehicular broadcast using 5G device-to-device communication

, 2018
With the ever-increasing call for connected vehicles and intelligent transportation applications, vehicular networking have been of significant focus recently.
Berg, J.L. van den, Heijenk, G., Karimzadeh, M., Gholibeigi, M., Sarrionandia, N., Baratchi, M.   +5 more
core  

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

International 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, Kufre‐Mfon Ekerete, Ali Roula, Ifiok Otung   +3 more
wiley   +1 more source

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

Science 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, Ryan L. Stowe, Aaron J. Burg   +2 more
wiley   +1 more source