Optimising Video Quality and Transmission Efficiency over Mobile WiMAX
نویسندگان
چکیده
This paper explores rules and defines cross layer parameters that maximize the received video quality per unit bandwidth while observing strict video QoS rules for unicast video transmission over mobile WiMAX. Channel capacity and goodput are estimated using an accurate MAC/PHY simulator. The simulator supports link adaptation of the PHY layer Modulation and Coding Scheme (MCS) alongside MAC layer Automatic Repeat Request (ARQ). A new optimization metric, PSNR per Hz, is defined to capture the video PSNR attained for a given effective bandwidth. For the 3GPP urban micro channel the optimum MCS and MAC layer block lifetime are determined as a function of average SNR in order to optimize video PSNR and goodput. At low SNR results show that higher level QAM is inefficient (as a result of excessive ARQ or high packet error rate) for video transfer. We note that video efficiency is enhanced for block lifetimes up to 100ms, since the greater use of ARQ allows more spectrally efficient MCS modes to be applied. Keywords-Mobile WiMAX; video streaming; PSNR; bandwidth efficiency; goodput; ARQ; link adaptation
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