Design of Store and Forward Data Collection Low-cost Nanosatellite

Addaim, Adnane; Kherras, Abdelhaq; Zantou, Bachir

doi:10.1109/aero.2007.353099

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…However, it is necessary to guide the network controller to choose a destination among compute nodes to secure highly continuous network connectivity and to enhance reliability/availability of the network. The importance of reliability/availability in a DC was previously demonstrated in [75]. These researchers also mentioned that, the reliability/availability of a DC is basically composed of not only the reliability/availability of computing servers but also the reliability/availability of network connections.…”

Section: Data Center Networkmentioning

confidence: 90%

Reliability and Availability Evaluation for Cloud Data Center Networks Using Hierarchical Models

et al. 2019

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Modeling a cloud computing center is crucial to evaluate and predict its inner connectivity reliability and availability. Many previous studies on system availability/reliability assessment of virtualized systems consisting of singular servers in cloud data centers have been reported. In this paper, we propose a hierarchical modeling framework for the reliability and availability evaluation of tree-based data center networks. The hierarchical model consists of three layers, including 1) reliability graphs in the top layer to model the system network topology; 2) a fault-tree to model the architecture of the subsystems; and 3) stochastic reward nets to capture the behaviors and dependency of the components in the subsystems in detail. Two representative data center networks based on three-tier and fat-tree topologies are modeled and analyzed in a comprehensive manner. We specifically consider a number of case-studies to investigate the impact of networking and management on cloud computing centers. Furthermore, we perform various detailed analyses with regard to reliability and availability measures for the system models. The analysis results show that appropriate networking to optimize the distribution of nodes within the data center networks can enhance the reliability/availability. The conclusion of this paper can be used toward the practical management and the construction of cloud computing centers. INDEX TERMS Data center network (DCN), reliability, availability, hierarchical modeling, reliability graph (RG), fault tree (FT), stochastic reward net (SRN).

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Section: Data Center Networkmentioning

confidence: 90%

Reliability and Availability Evaluation for Cloud Data Center Networks Using Hierarchical Models

et al. 2019

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“…Up to this point, the estimation process has been considered to be held by a single CubeSat. However, several studies on store and forward technology and its application to CubeSats have been done over the years [39], [40], [42]. With store and forward, a CubeSat can store its estimate on a ground terminal which can later be sent to another CubeSat of the same constellation.…”

Section: Repeating Orbitsmentioning

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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“…Where VF (1.3V -2V) and IF are the forward voltage and the resultant current flowing through the light emitting diode. Some commercially available LEDs and photodiodes were tested and evaluated for the designed transceiver [12][13][14]. The transmitter can generate a range of radiant intensities based on the available power.…”

Section: =mentioning

confidence: 99%

Intra‐spacecraft optical communication solutions using discrete transceiver

Mughal

Ali

Praks

et al. 2019

Satell Commun Network

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The ever-decreasing size of the small satellites with more demanding payloads has opened new research areas to investigate innovative onboard data handling solutions. The paper presents the use of optical intra satellite communication using discretely designed transceivers. The transceiver can handle large variations in the received photocurrents and implements filtration against the ambient light. The designed transceiver has been tested with selected optical components including infrared diodes, photo detectors and optical guides to validate its functionality. The displacement damage testing on selected optical components was performed to validate their suitability for use in space. The experimental communication schemes have been presented for free space as well as glass fiber based intra spacecraft communication. 10% of the total satellite mass [38]. The added harness mass puts additional constraints on the cost of the mission launch and fuel requirements. Therefore, the space industry is considering novel and out of the box solutions for future small satellite missions. The European Space Agency, in particular, has initiated projects to implement optical communication for inter as well as intra spacecraft communication [39-40]. As part of the inter-satellite communication activities, the first optical inter-satellite communication link was successfully established between the SPOT-4 and ARTEMIS satellites, proving the concept of utilizing optical communication technologies. In 2006, the Japanese Space Agency (JAXA) demonstrated a bidirectional optical link between its satellite and ARTEMIS. A number of in orbit communication solutions have been demonstrated on-board the spacecrafts in the last few years [10-15]. Although there have been initiatives of light based communication for relatively larger satellites, there has not been much research and development of implementing optical communication for relatively smaller satellites. A trade-off analysis of wire and wireless communication solutions for small spacecrafts was performed based on the recent literature review [20-27]. The traditional wired approach is least affected by the radio interference, achieves high security and reliability but at the expense of harness complexities.

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Design of Store and Forward Data Collection Low-cost Nanosatellite

Cited by 12 publications

References 6 publications

Reliability and Availability Evaluation for Cloud Data Center Networks Using Hierarchical Models

Reliability and Availability Evaluation for Cloud Data Center Networks Using Hierarchical Models

Network Size Estimation for Direct-to-Satellite IoT

Intra‐spacecraft optical communication solutions using discrete transceiver

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