A study on TCP error recovery interaction with Random Access satellite schemes

Bacco, Manlio; Gotta, Alberto; Roseti, C.; Zampognaro, F.

doi:10.1109/asms-spsc.2014.6934574

Cited by 20 publications

(5 citation statements)

References 12 publications

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“…On the contrary, in our throughput‐load graphs, the descending part is not caused by layer‐2 instability, but rather by the increase in packet loss due to unrecovered collisions. This means that a TCP flow self‐regulates the transmission rate according to the experienced packet loss and the system oscillates around the maximum efficiency; this effect has been confirmed by the simulation results reported in . So, the observation of the maximum throughput points in the various graphs allows evaluating the best operating conditions of the system.…”

Section: Simulation Resultssupporting

confidence: 59%

On elastic traffic via contention resolution diversity slotted aloha satellite access

Celandroni

Davoli

Ferro

et al. 2014

Int J Communication

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Summary This paper presents a performance study relative to the coupling of the Transmission Control Protocol (TCP) with the Contention Resolution Diversity slotted aloha (CRDSA) protocol, in the case of greedy TCP connections (also called elephants) on Digital Video Broadcasting-Return Channel via a geostationary satellite. CRDSA, which takes advantage of interference cancellation algorithms for collision/contention resolution, has already exhibited interesting performance when the power levels of all received bursts are perfectly balanced. In this paper, we extend the study to a more realistic case, where a certain spreading of the bursts' power levels is taken into account. The consequent capture effect even facilitates the collision resolution mechanism and yields an improvement in the overall TCP performance with respect to the balanced case. Furthermore, in certain conditions, the adoption of packet level forward error correction allows achieving even higher peaks of throughput than the expected ones

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Section: Simulation Resultssupporting

confidence: 59%

On elastic traffic via contention resolution diversity slotted aloha satellite access

Celandroni

Davoli

Ferro

et al. 2014

Int J Communication

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“…FEC can waste bandwidth because of the fixed redundancy rate that does not take into account the dynamism of the network. ARQ, on the other hand, uses retransmissions to compensate for lost traffic but can cause network congestion [11,12] and adversely affect multimedia quality [13]. Thus, it is not preferred for real-time traffic, especially in satellite transmission, which is characterized by long delays.…”

Section: Multipath Traffic Scheduling and Protectionmentioning

confidence: 99%

Learning-Based Traffic Scheduling in Non-Stationary Multipath 5G Non-Terrestrial Networks

et al. 2023

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In non-terrestrial networks, where low Earth orbit satellites and user equipment move relative to each other, line-of-sight tracking and adapting to channel state variations due to endpoint movements are a major challenge. Therefore, continuous line-of-sight estimation and channel impairment compensation are crucial for user equipment to access a satellite and maintain connectivity. In this paper, we propose a framework based on actor-critic reinforcement learning for traffic scheduling in non-terrestrial networks scenario where the channel state is non-stationary due to the variability of the line of sight, which depends on the current satellite elevation. We deploy the framework as an agent in a multipath routing scheme where the user equipment can access more than one satellite simultaneously to improve link reliability and throughput. We investigate how the agent schedules traffic in multiple satellite links by adopting policies that are evaluated by an actor-critic reinforcement learning approach. The agent continuously trains its model based on variations in satellite elevation angles, handovers, and relative line-of-sight probabilities. We compare the agent’s retraining time with the satellite visibility intervals to investigate the effectiveness of the agent’s learning rate. We carry out performance analysis while considering the dense urban area of Paris, where high-rise buildings significantly affect the line of sight. The simulation results show how the learning agent selects the scheduling policy when it is connected to a pair of satellites. The results also show that the retraining time of the learning agent is up to 0.1times the satellite visibility time at given elevations, which guarantees efficient use of satellite visibility.

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“…Posredstvom personaliziranog oglašavanja svoju su kampanju usmjerili na ekonomski ugroženiji sloj ljudi. 31 U pronalaženju eventualnih korisnika svoj doprinos mogu dati i algoritmi strojne obrade podataka tragajući za potencijalnim korisnicima na internetu i društvenim mrežama.…”

Section: Izazovi Neslućenih Dosega Informatizacijeunclassified

Informatizacija kao etički izazov

Kovačević,

Vrbanec,

Tomić

2023

Danubius Noster

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In the introductory part of this paper, the authors provide a short historical survey of inventions from the simplest computers to contemporary social networks. They state that computerization has become one of the constitutive elements of modern societies and point to enormous advantages in business, communication, education, social transition and interaction. They also notice some less desirable by-products of the informatization process that concern a the personal level of an individual: alienation, exposure, manipulation, possible endangerment of the moral and emotional dimension. Additional ethical challenges of computerization concern children, which the authors have dealt with elsewhere (Kovačević, Vrbanec, Tomić, 2022). With this paper, the authors want to contribute to the debate on the ethical aspect of informatization. They support the education of the social community about the ethical challenges of informatization, as well as the education of information experts about ethics and about possible threats to the rights of individuals. They call for the development of an integrated information policy at the national and international level.

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A study on TCP error recovery interaction with Random Access satellite schemes

Cited by 20 publications

References 12 publications

On elastic traffic via contention resolution diversity slotted aloha satellite access

On elastic traffic via contention resolution diversity slotted aloha satellite access

Learning-Based Traffic Scheduling in Non-Stationary Multipath 5G Non-Terrestrial Networks

Informatizacija kao etički izazov

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