TY - JOUR T1 - Power Management Mechanism Exploring Network and Video Information over Wireless Links JF - Journal of Networks, Academy Publishers Y1 - 2013 A1 - Christos Bouras A1 - Kostas Stamos A1 - Giannis Zaoudis A1 - Stamatis Stroumpis A1 - Savvas Charalambides AB - This article examines the ways in which crosslayer information from higher network layers may be utilized for more efficient power management in wireless networks and energy constrained mobile devices. In particular, we present and evaluate mechanisms that finetune transmission power according to information received from the transport (feedback reports from TFRC) and application (type of the video frame encoded) layers. Further improvements may be applied if the video encoding is done using capabilities of the SVC standard. We also describe power management adaptation techniques for wireless video transmission using the TFRC protocol that take into account feedback about the received video quality and try to adapt transmitting power accordingly. The purpose of the mechanisms is to utilize TFRC feedback and thus achieve a beneficial balance between the power consumption and the received video quality. The mechanisms proposed, offer significant improvements when used in terms of both power consumption and received video quality. All proposals are compared and evaluated using simulation. ER - TY - CONF T1 - Power management for SVC video over wireless networks T2 - Sixth International Conference on Broadband, Wireless Computing, Communication and Applications (BWCCA 2011), Barcelona, Spain, October 26 - 28 Y1 - 2011 A1 - Christos Bouras A1 - Kostas Stamos A1 - Giannis Zaoudis A1 - Stamatis Stroumpis A1 - Savvas Charalambides AB - The main idea of this paper is to study how the emerging H.264 SVC standard can be utilized for more efficient power management in wireless video transmissions. Our proposal uses a cross-layer approach which adapts the power transmission level of the sender according to the SVC information regarding the priority of the SVC NAL frame. Our aim is to improve transmission statistics, and therefore user experience, without unnecessary power consumption. We use extensive experimentation on the ns2 network simulator, which we have specifically modified for this purpose, in order to verify this approach. JF - Sixth International Conference on Broadband, Wireless Computing, Communication and Applications (BWCCA 2011), Barcelona, Spain, October 26 - 28 ER - TY - CONF T1 - Utilizing Video Enconding for Power Management over Wireless Networks T2 - International Conference on Data Communication Networking, DCNET 2011, Seville, Spain, July 18 - 21, 2011 Y1 - 2011 A1 - Christos Bouras A1 - Kostas Stamos A1 - Giannis Zaoudis A1 - Stamatis Stroumpis AB - Power management is especially important in wireless networks because of the emergence of energy constrained mobile devices. This paper examines the ways that video encoding information can be used for more efficient power management. In particular, we propose and evaluate cross layer mechanisms that fine- tune transmission power depending on the video frame being encoded and we examine how this mechanism may be combined with algorithms that adjust transmission power based on feedback reports when TFRC is used as the transport protocol. Since typical video encoding uses frames of varying importance for the overall quality, this approach can improve received video quality and make better usage of available power. JF - International Conference on Data Communication Networking, DCNET 2011, Seville, Spain, July 18 - 21, 2011 ER -