QoE-Aware Video Collaborative Distribution Mechanism in Cloud Radio Access Networks

Li, Zhidu; Li, Xue; Wang, Dapeng; Wang, Honggang; Wang, Ruyan

doi:10.1109/icc.2019.8761683

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Consequently, an outstanding energy storage density value of 3.84 J/cm 3 with an excellent efficiency value of 93.2% is achieved simultaneously under an applied electric field of 410 kV/cm. A comparison of W rec and η values of the SKNT-0.8 ceramic and those reported in lead-based, ,,− Bi-based perovskite-based, ,,,− and Pb/Bi-free TB-based ,,, is shown in the Figure f. Apparently, the remarkable energy storage density and efficiency realized simultaneously in this study can be on a par with that of most Bi-based perovskite-based ceramics reported recently and are significantly superior than that of other TB-based ceramics, showing great advantages in potential high-power energy capacitor applications.…”

Section: Resultssupporting

confidence: 54%

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Wang

Zhang

et al. 2021

ACS Appl. Energy Mater.

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In this study, a Pb/Bi-free Sr2KNb5O15-based tungsten bronze relaxor ceramic system was developed for possible energy storage applications via the site engineering technology. The introduction of Ta at the Nb site enhanced the breakdown strength and relaxor nature of the Sr2KNb5O15 ceramic. An extremely high energy storage density (∼3.84 J/cm3) accompanied by a remarkable energy storage efficiency (∼93.2%) was obtained under an applied electric field of 410 kV/cm in the composition of Sr2KNb4.2Ta0.8O15. Meanwhile, the ceramic exhibited a relatively wide frequency stability (1–500 Hz) and thermal stability (30–120 °C) and displayed a remarkable fatigue endurance after 104 cycles. Even more surprisingly, the Sr2KNb4.2Ta0.8O15 ceramic processed excellent discharging performances with a short discharge time (τ0.9 < 75 ns), a large discharge current density (1019 A/cm2), and an amazing power density (125.6 MW/cm3). The impressive performances demonstrated that the Sr2KNb4.2Ta0.8O15 tungsten bronze ceramic might be a potential Pb/Bi-free dielectric material for high-power pulse capacitor applications.

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Section: Resultssupporting

confidence: 54%

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Wang

Zhang

et al. 2021

ACS Appl. Energy Mater.

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“…Many wireless resource allocation algorithms to improve the client's QoE in cloud-based video streaming services exist. The authors in [23] narrowed the range of resource allocation by dividing clients into four types based on their buffer time to decrease the average playback rebuffering time of clients. However, the proposed greedy algorithm still cannot obtain the optimal resource allocation.…”

Section: Qoe-driven Wireless Resource Allocation Algorithmsmentioning

confidence: 99%

Towards 5G: Joint Optimization of Video Segment Cache, Transcoding and Resource Allocation for Adaptive Video Streaming in a Muti-access Edge Computing Network

Huang,

He,

Wang

et al. 2020

Preprint

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The cache and transcoding of the multi-access edge computing (MEC) server and wireless resource allocation in eNodeB interact and determine the quality of experience (QoE) of dynamic adaptive streaming over HTTP (DASH) clients in MEC networks. However, the relationship among the three factors has not been explored, which has led to limited improvement in clients' QoE. Therefore, we propose a joint optimization framework of video segment cache and transcoding in MEC servers and resource allocation to improve the QoE of DASH clients. Based on the established framework, we develop a MEC cache management mechanism that consists of the MEC cache partition, video segment deletion, and MEC cache space transfer. Then, a joint optimization algorithm that combines video segment cache and transcoding in the MEC server and resource allocation is proposed. In the algorithm, the clients' channel state and the playback status and cooperation among MEC servers are employed to estimate the client's priority, video segment presentation switch and continuous playback time. Considering the above four factors, we develop a utility function model of clients' QoE. Then, we formulate a mixed-integer nonlinear programming mathematical model to maximize the total utility of DASH clients, where the video segment cache and transcoding strategy and resource allocation strategy are jointly optimized. To solve this problem, we propose a low-complexity heuristic algorithm that decomposes the original problem into multiple subproblems. The simulation results show that our proposed algorithms efficiently improve client's throughput, received video quality and hit ratio of video segments while decreasing the playback rebuffering time, video segment presentation switch and system backhaul traffic.

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Grouping Scheme to Improve Resource Block Utilization in D2D Communications

Tseng

Schindelhauer

Kuo

et al. 2019

2019 IEEE Globecom Workshops (GC Wkshps)

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QoE-Aware Video Collaborative Distribution Mechanism in Cloud Radio Access Networks

Cited by 4 publications

References 19 publications

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Towards 5G: Joint Optimization of Video Segment Cache, Transcoding and Resource Allocation for Adaptive Video Streaming in a Muti-access Edge Computing Network

Grouping Scheme to Improve Resource Block Utilization in D2D Communications

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