Abstract
With increase in global mobile data traffic, mobile video traffic is expected to exceed 50 percent of it in subsequent year. Video telephony being relatively resource hungry application, requires more bandwidth and power on the device. This motivates research opportunity for power saving over wireless access network. Power saving is addressed well for VoIP application harnessing their traffic properties. However, power saving is not optimized for multimedia application like video telephony which requires strict latency and QoS guarantee. In this paper we propose cross layer power saving approach for video telephony without any change in existing architecture. We present a new algorithm to obtain and predict video frame sizes at an intermediate node (Base Station) for optimally utilizing the sleep opportunity at the Mobile Station (MS). We use incoming video traffic information from MS to Base Station (BS) for estimating futuristic traffic. Extensive simulation with various video files and channel condition is performed. We observe that the optimum bandwidth required for video transmission with sleep mechanism for acceptable QoE is more than the mean video bit-rate. Better QoE and longer sleep duration, upto 87.5\% can be achieved for higher bandwidth per MS.
Submitted to WoWMoM 2012
Available on request : nandan.amar@ieee.org