A fuzzy admission control scheme for high quality video delivery over underlay cognitive radio

In cognitive radio networks, if all the secondary user (SU) packets join the system without any restrictions, the average latency of the SU packets will be greater, especially when the traffic load of the system is higher. For this, we propose an adaptive admission control scheme with a system access probability for the SU packets in this paper. We suppose the system access probability is inversely proportional to the total number of packets in the system and introduce an Adaptive Factor to adjust the system access probability. Accordingly, we build a discrete-time preemptive queueing model with adjustable joining rate. In order to obtain the steady-state distribution of the queueing model exactly, we construct a two-dimensional Markov chain. Moreover, we derive the formulas for the blocking rate, the throughput, and the average latency of the SU packets. Afterwards, we provide numerical results to investigate the influence of the Adaptive Factor on different performance measures. We also give the individually optimal strategy and the socially optimal strategy from the standpoints of the SU packets. Finally, we provide a pricing mechanism to coordinate the two optimal strategies.

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An admission control scheme for secondary users in cognitive radio networks

Proceedings of the 11th IEEE International Conference on Networking, Sensing and Control ◽

10.1109/icnsc.2014.6819633 ◽

2014 ◽

Cited By ~ 1

Author(s):

Salman A. AlQahtani ◽

Hassan Ahmed

Keyword(s):

Cognitive Radio ◽

Admission Control ◽

Cognitive Radio Networks ◽

Radio Networks ◽

Secondary Users ◽

Control Scheme ◽

Admission Control Scheme

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A proposal of a high quality video delivery method in small-scale best-effort networks

14th International Workshop on Database and Expert Systems Applications, 2003. Proceedings. ◽

10.1109/dexa.2003.1232011 ◽

2004 ◽

Author(s):

Y. Kato ◽

K. Hakozaki

Keyword(s):

Small Scale ◽

Video Delivery ◽

Delivery Method ◽

High Quality ◽

Best Effort ◽

Quality Video ◽

High Quality Video

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Regional education on endoscopic surgery using a teleconference system with high-quality video via the internet: Saga surgical videoconferences

BMC Medical Education ◽

10.1186/s12909-020-02215-0 ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Tatsuya Manabe ◽

Mitsuhiro Takasaki ◽

Takao Ide ◽

Kenji Kitahara ◽

Seiji Sato ◽

...

Keyword(s):

Endoscopic Surgery ◽

Educational System ◽

High Speed ◽

The Internet ◽

Web Conferencing ◽

High Quality ◽

Anatomical Structures ◽

Quality Video ◽

High Quality Video ◽

Conferencing System

Abstract Background Effective education about endoscopic surgery (ES) is greatly needed for unskilled surgeons, especially at low-volume institutions, to maintain the safety of patients. We have tried to establish the remote educational system using videoconference system through the internet for education about ES to surgeons belonging to affiliate institutions. The aim of this manuscript was to report the potential to establish a comfortable remote educational system and to debate its advantages. Methods We established a local remote educational conference system by combining the use of a general web conferencing system and a synchronized remote video playback system with annotation function through a high-speed internet. Results During 2014–2019, we conducted 14 videoconferences to review and improve surgeons’ skills in performing ES at affiliated institutions. At these conferences, while an uncut video of ES that had been performed at one of the affiliated institutions was shown, the surgical procedure was discussed frankly, and expert surgeons advised improvements. The annotation system is useful for easy, prompt recognition among the audience regarding anatomical structures and procedures that are difficult to explain verbally. Conclusions This system is of low initial cost and offers easy participation and high-quality videos. It would therefore be a useful tool for regional ES education.

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