Randomly Pre-Coded Packets Based Random Access Scheme for IoT-Oriented Satellite Networks

Su, Jingrui; Ren, Guangliang; Wang, Qiwei; Zhang, Huining

doi:10.1109/access.2020.3043882

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…It is common in the literature that the length of a slot in a communication protocol such as FSA lasts an amount of time equal to the time of packet transmission. In the existing literature, applications with packet lengths of around 1000 bits can be found [50]; the packet transmission times vary depending on the IoT application. If the transmission of a packet takes for example 5 ms [51], then a frame takes 512 • 5 = 2560 ms, that is 2.56 seconds.…”

Section: B Computational Costmentioning

confidence: 99%

Network Size Estimation for Direct-to-Satellite IoT

Ilabaca

Montejo‐Sánchez²,

Fraire

et al. 2023

IEEE Internet Things J.

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The worldwide adoption of the Internet of things (IoT) depends on the massive deployment of sensor nodes and timely data collection. However, installing the required ground infrastructure in remote or inaccessible areas can be economically unattractive or unfeasible. Cost-effective nanosatellites deployed in low Earth orbits (LEO) are emerging as an alternative solution: on-board IoT gateways provide access to remote IoT devices, according to direct-to-satellite IoT (DtS-IoT) architectures. One of the main challenges of DtS-IoT is to devise communication protocols that scale to thousands of highly constrained devices served by likewise constrained orbiting gateways. In this paper, we tackle this issue by first estimating the (varying) size of the device set underneath the (mobile) nanosatellite footprint. Then, we demonstrate applicability of the estimation when used to intelligently throttle DtS-IoT access protocols. Since recent works have shown that MAC protocols improve the throughput and energy efficiency of a DtS-IoT network when a network size estimation is available, we present here a novel and computationally-efficient network size estimator in DtS-IoT: our optimistic collision information (OCI) based estimator. We evaluate OCI's effectiveness with extensive simulations of DtS-IoT scenarios. Results show that when using network size estimations, the scalability of a frame slotted Aloha-based DtS-IoT network is boosted 8-fold, serving up to 4 × 10 3 devices, without energy efficiency penalties. We also show the effectiveness of the OCI mechanism given realistic detection ratios and demonstrate its low computational cost implementation, making it a strong candidate for network estimation in DtS-IoT.

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Section: B Computational Costmentioning

confidence: 99%

Network Size Estimation for Direct-to-Satellite IoT

Ilabaca

Montejo‐Sánchez²,

Fraire

et al. 2023

IEEE Internet Things J.

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“…Reinforcement learning to enhance the efficiency of random access methods was also investigated in [16]. The throughput improvement of satellite IoT systems using CRDSA was discussed in [17], [18].…”

Section: Related Workmentioning

confidence: 99%

Transmission Control Considering Different Available Channels for CRDSA/IRSA in Satellite IoT Systems

Kumazawa,

Okada,

Matsui

et al. 2023

IEEE Access

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In satellite Internet-of-Things (IoT) systems using the 920-MHz band Low Power Wide Area, available channels for each terminal are limited to avoid interference with terrestrial networks. Since this limitation depends on the location of the terminal, the available channels are different, resulting in throughput degradation. This paper proposes a transmission control scheme that reduces throughput degradation due to different available channels in the Contention Resolution Diversity Slotted ALOHA (CRDSA)/Irregular-Repetition Slotted ALOHA (IRSA) system. The proposed transmission control uses constraints that consider the characteristics of CRDSA/IRSA, as well as an objective function that considers fairness of throughput among terminals. Under these constraints and objective function, the transmission probability was calculated using an objective function that maximized the transmitting load. The computer simulation showed that it could achieve high throughput by preventing the influence of difference in the available channels.INDEX TERMS satellite IoT system, CRDSA, IRSA, media access control, 920 MHz LPWA I. INTRODUCTION

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“…A number of solutions to enhance the performance of random access (RA) IoRT-oriented satellite networks have been applied together in the latest years [12], specially so, for the satellite return link. Such is the case for Slotted ALOHA (SA) and its first successor in incorporating temporal diversity, Diversity-Framed SA (DFSA), which is, finally, also endowed with interference cancellation in Contention Resolution Diversity SA (CRDSA) [13].…”

Section: Introductionmentioning

confidence: 99%

Energy Allocation Design for the Satellite Return Channel of a Massive NOMA System With Interference Cancellation

Molina

Sala-Alvarez

2022

IEEE Trans. on Green Commun. Netw.

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The energy allocation problem in a massive access setting under iterative successive interference cancellation (SIC) is undertaken in this work. The classic one-iteration SIC still has room for improvement when the channel coding schemes adopted are non-error free. In this work, we investigate a satellite return link in which transmitters employ the same physical layer and transmission protocol: a given encoder, and spreading-based nonorthogonal multiple access. Leveraging iterative SIC, the gateway is endowed with strong interference suppression potential to deal with many uncoordinated transmissions. We elaborate on the interplay between energy and reliability for all users by designing an energy allocation with minimum energy expenditure when the iterative SIC receiver performs two decoding attempts per user. We resort to the user-asymptotic regime to address the randomness in the multi-feature system model of two-iteration SIC, which has turned the analysis into a deterministic one. We formulate our final design as a vector optimization aided by tools from the calculus of variations. We show the competitive performance achieved by the designed allocation, specially under encoders associated with short-length codes. We also assess our analysis by simulating a low-level SIC implementation.

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Randomly Pre-Coded Packets Based Random Access Scheme for IoT-Oriented Satellite Networks

Cited by 6 publications

References 29 publications

Network Size Estimation for Direct-to-Satellite IoT

Network Size Estimation for Direct-to-Satellite IoT

Transmission Control Considering Different Available Channels for CRDSA/IRSA in Satellite IoT Systems

Energy Allocation Design for the Satellite Return Channel of a Massive NOMA System With Interference Cancellation

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