Cooperative Beam Hopping for Accurate Positioning in Ultra-Dense LEO Satellite Networks

Wang, Yu; Chen, Ying; Qiao, Yunfei; Luo, Hejia; Wang, Xiaolu; Li, Rong; Wang, Jun

doi:10.1109/iccworkshops50388.2021.9473538

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…In the DVB-S2X standard [8], a super-frame format to facilitate BH implementation and performance enhancement has been specified. In the literature, BH has been applied in different scenarios, e.g., load balancing networks [9], cognitive satellite networks [10], and ultra-dense LEO systems [11].…”

Section: Introductionmentioning

confidence: 99%

Joint Optimization of Beam-Hopping Design and NOMA-Assisted Transmission for Flexible Satellite Systems

Wang

Lei

Lagunas

et al. 2022

IEEE Trans. Wireless Commun.

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Next-generation satellite systems require more flexibility in resource management such that available radio resources can be dynamically allocated to meet time-varying and nonuniform traffic demands. Considering potential benefits of beam hopping (BH) and non-orthogonal multiple access (NOMA), we exploit the time-domain flexibility in multi-beam satellite systems by optimizing BH design, and enhance the powerdomain flexibility via NOMA. In this paper, we investigate the synergy and mutual influence of beam hopping and NOMA. We jointly optimize power allocation, beam scheduling, and terminaltimeslot assignment to minimize the gap between requested traffic demand and offered capacity. In the solution development, we formally prove the NP-hardness of the optimization problem. Next, we develop a bounding scheme to tightly gauge the global optimum and propose a suboptimal algorithm to enable efficient resource assignment. Numerical results demonstrate the benefits of combining NOMA and BH, and validate the superiority of the proposed BH-NOMA schemes over benchmarks.

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Section: Introductionmentioning

confidence: 99%

Joint Optimization of Beam-Hopping Design and NOMA-Assisted Transmission for Flexible Satellite Systems

Wang

Lei

Lagunas

et al. 2022

IEEE Trans. Wireless Commun.

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“…where [x] is the fractional part of x. In addition, SC-centric beam hopping method [37]- [39] is applied to serve the wide coverage area. In other words, once a beam is activated, the beam should point to the center position, i.e., Φ c , of a target SC.…”

Section: A System Modelmentioning

confidence: 99%

When LEO Mega-Constellations Meet New Radio: A Holistic Performance Evaluation Framework

Wang,

Meng,

Luo

et al. 2023

IEEE Access

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Low Earth orbit (LEO) mega-constellation satellite networks (LMCSNs) have shown great potential to extend the coverage capability of conventional terrestrial networks. The exploitation of the prevalent New Radio (NR) standard for LMCSNs can unleash the full potential toward a highly integrated satellite-terrestrial network. Despite this premise, how to systematically define, quantify, and assess the technical performance of NR enabled LMCSNs remains an open issue. In this paper, we address the challenging issue by proposing a holistic performance evaluation framework. Firstly, a key performance indicator (KPI) system including constellation-specific KPIs (i.e., N -asset coverage, area traffic capacity, and service availability) and radio interface technology KPIs is devised. An efficient LEO constellation oriented performance assessment methodology is then carefully designed based on realistic beam layout and accurate interference modeling. We have carried out rigorous system-level simulations and provided extensive numerical results to assess the KPI system. It can be observed that the achieved area traffic capacity of the reference LEO constellation with 1800 satellites is less than 4 Kbps/km 2 . Besides, the N -asset coverage and service availability range from 5.95 to 11.45, and from 24.9% to 32.7%, respectively.

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“…Reference [ 18 ] aimed at the inaccurate positioning problem caused by different signal quality between user and multiple LEO satellites to propose a Flexible Beam-Hopping Control Algorithm (FBHCA) and decompose this problem into three sub-problems. These sub-problems are solved by three approaches or techniques, respectively, and the numerical results indicate that these approaches can improve the positioning precision obviously.…”

Section: Introductionmentioning

confidence: 99%

Improved Spread Spectrum Aloha Protocol and Beam-Hopping Approach for Return Channel in Satellite Internet of Things

Gou¹,

Bian

Dong³

et al. 2023

Sensors

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This paper examines potential performances of the Spread Spectrum-based random access technique and proposes an Improved Spread Spectrum Aloha (ISSA) protocol for the return channel in satellite Internet of Things (IoT) based on the beam-hopping technique. The key design driver and detailed solution of ISSA protocol are presented in this work and it is shown that the proposed protocol achieves high throughput and low collision probability. To match user/traffic distribution, delay requirement and channel condition with beam allocation better, a low-complexity heuristic beam scheduling algorithm and a more effective Maximum-Weighted Clique (MWC) algorithm have been proposed. The heuristic algorithm considers the user/traffic distribution, inter-beam interference, and fairness primarily. However, the MWC algorithm gives considerations not only on above factors, but also on delay requirement and channel condition (path loss and rain attenuation) to maximize system capacity. The beam angle and interference avoidance threshold are proposed to measure the inter-beam interference, and the link propagation loss and rain attenuation are considered meanwhile in the channel condition. In the MWC algorithm, we construct an auxiliary graph to find the maximum-weighted clique and derive the weighting approach to be applied in different application scenarios. The performance evaluation of our ISSA protocol compared with the SSA protocol is presented, which achieves a gain of 16.7%. The simulation of the ISSA protocol combined with round robin, heuristic, and MWC beam scheduling for the return link in beam-hopping satellite IoTs is also provided. The results indicate that the throughput in nonuniform user distribution is much lower than in the uniform case without the beam scheduling algorithm. Through the application of the scheduling algorithm, the throughput performance can approach the uniform distribution. Finally, the degree of user satisfaction with different scheduling approaches is presented, which validates the effectiveness of heuristic and MWC algorithms.

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Cooperative Beam Hopping for Accurate Positioning in Ultra-Dense LEO Satellite Networks

Cited by 10 publications

References 13 publications

Joint Optimization of Beam-Hopping Design and NOMA-Assisted Transmission for Flexible Satellite Systems

Joint Optimization of Beam-Hopping Design and NOMA-Assisted Transmission for Flexible Satellite Systems

When LEO Mega-Constellations Meet New Radio: A Holistic Performance Evaluation Framework

Improved Spread Spectrum Aloha Protocol and Beam-Hopping Approach for Return Channel in Satellite Internet of Things

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