quality-driven cross-layer optimized video delivery over lte
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Quality-Driven Cross-Layer Optimized Video Delivery over LTE. IEEE Communications Magazine , FEB 2010 Speaker: 劉姿瑾 Date: 25, JUL 2012. Outline . Introduction Objective System Overview Cross-Layer Optimized System Dynamic Resource Allocation - WRR Experimental Analysis Conclusions - PowerPoint PPT PresentationTRANSCRIPT
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Quality-Driven Cross-Layer Optimized Video Delivery over LTE
IEEE Communications Magazine, FEB 2010Speaker: 劉姿瑾
Date: 25, JUL 2012
Copyright © 2011, [email protected]
Outline
• Introduction• Objective• System Overview
– Cross-Layer Optimized System– Dynamic Resource Allocation - WRR
• Experimental Analysis• Conclusions• References
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Introduction
• Application-oriented QoS for video delivery have been largely ignored.
• Higher data rate could lead to higher packet loss rate– Degrading the user-perceived video quality.
• A new QoS-aware LTE OFDMA scheduling algorithm: – LTE downlink– Real-time video– Best user-perceived video quality – Under the given application delay constraint.
• A cross-layer system to optimize video delivery.
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Objective
• Under given QoS constraints, dynamically allocating resources and choosing system parameters to:
• Maximize system throughput.• Achieve scheduling fairness.
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System Overview
• Cross-layer optimized video delivery system:– Dynamic resource allocation
• WRR – Weighted Round-Robin Scheduling Algorithm
– Video application• Video encoding
– Wireless delivery• Channel quality feedback
– Cross-layer optimization• Best MCS – Modulation and Coding Scheme• Encoder parameters
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Dynamic resource allocation - WRR
• WRR – Weighted Round-Robin Scheduling Algorithm:– Channel quality – Packet delay constraint– Historical average data rate
• To overcome:– Distortion– Throughput – Fairness
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Dynamic resource allocation – WRR (2)
• Channel quality (positive)– – The maximum available channel rate.
• Channel quality presenting by SNR – Signal to Noise Ratio.• The larger the available channel rate, the higher the need to
assign this resource block to the user.• Packet delay constraint (negative)
– – The maximum delay constraint.• - QoS delay constraint for user n at any resource allocation
period.• Historical average data rate (negative)
– – The maximum historical average data rate.• The average data rate of this user on a given resource block
within a given time window .• Wider : Fairness-oriented• Smaller : Throughput-oriented
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Dynamic resource allocation – WRR (3)
• Weighting the user against all the available resource blocks in the current OFDM frame.– Resource Block (RB): The unit of allocating
resource.– : The total available RBs of a given OFDM frame.
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Conclusions
• An extended QoS-aware OFDMA scheduling algorithm has been proposed.– System throughput– Application QoS– Scheduling fairness
• A cross-layer optimized system has been presented.– Achieve the best user-perceived video quality – Dynamically adapting to the instantaneous
channel quality.
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References
• Haiyan Luo; Song Ci; Dalei Wu; Jianjun Wu; Hui Tang, “Quality-driven cross-layer optimized video delivery over LTE,” Communications Magazine, IEEE, 2010 , Page(s): 102 - 109