NGSO Constellation Design for Global Connectivity

  title={NGSO Constellation Design for Global Connectivity},
  author={Israel Leyva-Mayorga and Beatriz Soret and Bho Matthiesen and Maik Roper and D. W{\"u}bben and Armin Dekorsy and Petar Popovski},
Israel Leyva-Mayorga∗, Beatriz Soret∗†, Bho Matthiesen‡§, Maik Röper‡, Dirk Wübben‡, Armin Dekorsy‡, and Petar Popovski∗§ ∗Department of Electronic Systems, Aalborg University, Aalborg, Denmark ∗Telecommunications Research Institute (TELMA), University of Malaga, Malaga, Spain ‡Gauss-Olbers Center, c/o University of Bremen, Dept. of Communications Engineering, Germany §University of Bremen, U Bremen Excellence Chair, Dept. of Communications Engineering, Germany 
1 Citations

Federated Learning in Satellite Constellations

This paper provides a taxonomy of different types of satellite connectivity relevant for FL and shows how the distributed training process can overcome the slow convergence due to long offline times of clients by taking advantage of the predictable intermittency of the satellite communication links.



Integration of Satellites in 5G through LEO Constellations

A heterogeneous architecture is considered in which a LEO mega-constellation satellite system provides backhaul connectivity to terrestrial 5G Relay Nodes, which create an on- ground 5G network and solutions are proposed for Random Access, waveform numerology, and HARQ procedures.

Exploiting topology awareness for routing in LEO satellite constellations

This paper presents a lightweight and topology-aware routing metric that favors the selection of paths with high data rate inter-satellite links (ISLs) and consistently achieves the shortest queueing times at the satellites and, ultimately, the shortest end-to-end latency.

LEO Small-Satellite Constellations for 5G and Beyond-5G Communications

This paper provides a comprehensive overview of the physical and logical links, along with the essential architectural and technological components that enable the full integration of LEO constellations into 5G and B5G systems.

Inter-Plane Inter-Satellite Connectivity in LEO Constellations: Beam Switching vs. Beam Steering

By selecting an update period of 30 seconds for the matching, reliable communication can be achieved throughout the constellation, where the impact of interference in the rates is less than 0.7 % when compared to orthogonal links, even for relatively small antenna arrays.

Inter-Plane Inter-Satellite Connectivity in Dense LEO Constellations

A framework and the corresponding algorithms for the dynamic establishment of the inter-plane ISLs in LEO constellations are presented and the results show that the sum of rates in the constellation are increased by up to 115% with respect to the state-of-the-art benchmark schemes in an interference-free environment.

Ground-Assisted Federated Learning in LEO Satellite Constellations

A new set of algorithms based on Federated learning (FL), including a novel asynchronous FL procedure based on FedAvg that exhibits better robustness against heterogeneous scenarios than the state-of-the-art, is proposed.

Delay is Not an Option: Low Latency Routing in Space

A preliminary evaluation of how well such a network can provide low-latency communications is provided, and a network built in this manner can provide lower latency communications than any possible terrestrial optical fiber network for communications over distances greater than about 3000 km.

On Ad hoc On-Demand Distance Vector Routing in Low Earth Orbit Nanosatellite Constellations

It is concluded that AODV should be complemented with proactive routing in tightly controlled polar constellations, since pre-computed routing tables will perform better under specific conditions.

Architectures and Key Technical Challenges for 5G Systems Incorporating Satellites

The proposed analysis shows that the main technical challenges are related to the PHY/MAC procedures, in particular random access, timing advance, and hybrid automatic repeat request and depending on the considered service and architecture, different solutions are proposed.

Broadband LEO Satellite Communications: Architectures and Key Technologies

This article aims to provide a comprehensive overview for key issues in broadband LEO satellite communication systems, where the space-based LEO system with ISL, which requires a small number of ground gateways, is the focus.