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On the QoS Assessment of Video Sessions in Heterogeneous 3G-WLAN Networks with Seamless and Secure Mobility Support

China Communications 2007年第1期4卷 105-119页

作者： Ilias Politis michail tsagkaropoulos Stavros Kotsopoulos Tasos Dagiuklas Peter Stavroulakis Dept.of Electrical and Computer Engineering University of Patras26500 Greece Dept.of Telecommunications and Network Systems Technical Institute of MessolonghiNafpaktosGreece Technical University of Crete Roumeliotaki 17 str.73100 LentarianaChaniaCreteGreece

Real-time video data transmission is currently emerging as a popular application among mobile users but it is very sensitive to QoS degradation due to packet losses in wireless *** order to achieve service continuity and integrity upon handoffs among heterogeneous networks,provisioning of seamless and secure mobility is ***,in order to reduce the delay and packet losses during vertical handovers we need to employ supportive protocols like context *** this paper we evaluate the QoS of video transmission over a heterogeneous 3G-WLAN *** aggregate video data traffic is represented by a dynamic two-dimensional Markov chain model,which has been evaluated against real video data *** the vertical handover, appropriate AAA handshaking and enhanced mobility management using context transfer have been *** QoS evaluation of video streams was performed based on peak signal-noise ratio(PSNR) measurements,while we analyticallyestimated the number of packet losses during *** results show that both packet loss within the converged network and loss occurrence affecting the perceived video quality is reduced. Moreover,the proposed context transfer scheme minimizes handover delay and the number of lost packet up to 3 times compared to standard AAA handshaking.

关键词： heterogeneous wireless networks multiplexed video traffic RADIUS-AAA,context transfer

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Secure Packet Video Transmission over Wireless Multimedia Sensor Networks

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China Communications 2008年第2期5卷 59-67页

作者： Ilias Politis michail tsagkaropoulos Sofia Gouskou Stavros Kotsopoulos Peter Stavroulakis Dept.of Electrical and Computer Engineering University of Patras Ericsson Research Technical University of Crete

This paper proposes a packet scheduling scheme thatoptimizing the coded video transmission overmultipath wireless multimedia sensor networks interms of received video distortion and power efficiencyenhances the security aspects of the *** the aggregate transmission rateavailable at the network cannot support the requiredtransmission rate,the scheduling algorithm can selectivelydrop combinations of video packets prior totransmission to adapt the rate of the sender to thelimitations of the wireless channel *** algorithms are *** Baselinescheme utilizes a novel distortion prediction modeland decides upon which packet can be dropped priorto transmission based on the packet’s impact on thevideo *** addition to the bandwidthlimitations,the Power aware packet scheduling is an extension of the Baseline capable of estimating thepower that will be consumed by each node during thetransmission;hence it can control the power consumptionby selectively drop packets of low importanceto the decoded *** results indicatethe efficiency of the proposed scheduling schemein terms of received video distortion(PSNR)andpower consumption.

关键词： Terms-WMSN packet scheduling power consumption video distortion

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