Non-Terrestrial Networks: Link Budget Analysis

Guidotti, Alessandro; Vanelli‐Coralli, Alessandro; Mengali, Alberto; Cioni, Stefano

doi:10.1109/icc40277.2020.9149179

Cited by 23 publications

(15 citation statements)

References 6 publications

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“…This leads to SNR enhancement (i.e. performance enhancement) when combining within the same SG in (14). Furthermore, this is also related to the fact that at lower elevation angles, where higher D-RTDS are expected, better Doppler rate accuracy is needed compared to higher elevation angles, as explained in Section V-C.…”

Section: B Obtained Resultsmentioning

confidence: 97%

“…Moreover, antenna-gain-to-noise-temperature (G/T ) in Set-1 is greater than in Set-2, which comes as a byproduct of the reduction of the equivalent satellite antenna aperture. For more details related to the payload configuration and beam layout aspect, we refer the reader to [5], [14], [15], where a thorough discussion can be found.…”

Section: A System Architecturementioning

confidence: 99%

“…Approximations in(13) and(14) are possible only for indexes representing a short time duration. With indexes representing a long time duration (e.g.…”

mentioning

confidence: 99%

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NB-IoT Random Access for Nonterrestrial Networks: Preamble Detection and Uplink Synchronization

Chougrani

Kisseleff

Martins

et al. 2022

IEEE Internet Things J.

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The satellite component is recognized as a promising solution to complement and extend the coverage of future Internet of things (IoT) terrestrial networks (TNs). In this context, a study item to integrate satellites into narrowband-IoT (NB-IoT) systems has been approved within the 3rd Generation Partnership Project (3GPP) standardization body. However, as NB-IoT systems were initially conceived for TNs, their basic design principles and operation might require some key modifications when incorporating the satellite component. These changes in NB-IoT systems, therefore, need to be carefully implemented in order to guarantee a seamless integration of both TN and non-terrestrial network (NTN) for a global coverage. This paper addresses this adaptation for the random access (RA) step in NB-IoT systems, which is in fact the most challenging aspect in the NTN context, for it deals with multi-user time-frequency synchronization and timing advance for data scheduling. In particular, we propose an RA technique which is robust to typical satellite channel impairments, including long delays, significant Doppler effects, and wide beams, without requiring any modification to the current NB-IoT RA waveform. Performance evaluations demonstrate the proposal's capability of addressing different NTN configurations recently defined by 3GPP for the 5G new radio system.

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Section: B Obtained Resultsmentioning

confidence: 97%

Section: A System Architecturementioning

confidence: 99%

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NB-IoT Random Access for Nonterrestrial Networks: Preamble Detection and Uplink Synchronization

Chougrani

Kisseleff

Martins

et al. 2022

IEEE Internet Things J.

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“…an handheld in the S-band and a VSAT in Ka-band. For other scenarios and configurations, the interested reader can refer to [6], [97], [98]. Clearly, one can observe that the obtained very low carrier-to-noise ratio (CNR) at the handheld terminal is very poor when GSO satellite is employed.…”

Section: A Physical and Radio Access Aspectsmentioning

confidence: 99%

A Survey on Nongeostationary Satellite Systems: The Communication Perspective

Al-Hraishawi

Chougrani

Kisseleff

et al. 2023

IEEE Commun. Surv. Tutorials

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The next phase of satellite technology is being characterized by a new evolution in non-geostationary orbit (NGSO) satellites, which conveys exciting new communication capabilities to provide non-terrestrial connectivity solutions and to support a wide range of digital technologies from various industries. NGSO communication systems are known for a number of key features such as lower propagation delay, smaller size, and lower signal losses in comparison to the conventional geostationary orbit (GSO) satellites, which can potentially enable latency-critical applications to be provided through satellites. NGSO promises a substantial boost in communication speed and energy efficiency, and thus, tackling the main inhibiting factors of commercializing GSO satellites for broader utilization. The promised improvements of NGSO systems have motivated this paper to provide a comprehensive survey of the state-of-theart NGSO research focusing on the communication prospects, including physical layer and radio access technologies along with the networking aspects and the overall system features and architectures. Beyond this, there are still many NGSO deployment challenges to be addressed to ensure seamless integration not only with GSO systems but also with terrestrial networks. These unprecedented challenges are also discussed in this paper, including coexistence with GSO systems in terms of spectrum access and regulatory issues, satellite constellation and architecture designs, resource management problems, and user equipment requirements. Finally, we outline a set of innovative research directions and new opportunities for future NGSO research.

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“…Thus, it is more practical to investigate and analyze the studied system model by incorporating the developed 3GPP NTN channel model. Accordingly, the total path losses of the link between the n-th satellite and the m-th user is denoted as P L n m , and can be expressed as [16]…”

Section: A Channel Modelmentioning

confidence: 99%

Traffic-Aware Satellite Switch-off Technique for LEO Constellations

Gupta

Al-Hraishawi

Lagunas

et al. 2022

2022 IEEE Globecom Workshops (GC Wkshps)

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Low Earth orbit (LEO) satellite constellations will be a fundamental part in future communication networks by providing seamless global coverage and extending data paths to the space, both in the standalone deployment and in the satellite-terrestrial integrated networks. However, LEO constellations still need to address a set of development challenges to ensure long-term viability; particularly, in terms of energy efficiency and satellite lifespan. In this paper, a traffic-aware satellite switch-off technique is proposed to minimize the power consumption in LEO constellations. This includes formulating and solving a mixed binary integer optimization problem under the constraints of satellite-user visibility and satisfying the demand requirements of all the ground users. The performance of the proposed technique is evaluated via simulations using practical constellation pattern and realistic traffic distribution. It has been shown that nearly 40% of the satellite nodes can be redundant and switched-off for energy saving, and thus, extending the constellation lifetime and alleviating the aggregated interference due to utilizing a large number of multibeam satellites.

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Non-Terrestrial Networks: Link Budget Analysis

Cited by 23 publications

References 6 publications

NB-IoT Random Access for Nonterrestrial Networks: Preamble Detection and Uplink Synchronization

NB-IoT Random Access for Nonterrestrial Networks: Preamble Detection and Uplink Synchronization

A Survey on Nongeostationary Satellite Systems: The Communication Perspective

Traffic-Aware Satellite Switch-off Technique for LEO Constellations

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