WiFi Display, also called Miracast, is an emerging technology that allows a mobile device (source) to duplicate its screen content to an external display (sink) via a peer-to-peer WiFi link. Despite its diverse application scenarios and growing popularity, Miracast consumes substantial power due to a combination of video encoding\/decoding and transmission. In this paper, we \ufb01rst conduct a measurement study to quantify and model key parameters that scale Miracast\u2019s power consumption. We then propose a set of optimization mechanisms to bypass redundant codec operations, reduce video tail traf\ufb01c, and relocate the Miracast channel dynamically to maximize transmission ef\ufb01ciency. We have implemented this energy-ef\ufb01cient Miracast framework on an Android smartphone. Experimental results show that the legacy Miracast system costs 1.3 to 2.4 Watts. Our framework reduces the power consumption by 29% to 61%, depending on the Miracast application\u2019s video traf\ufb01c patterns. Our optimization mechanisms do not affect the video quality, and can even reduce the latency of certain Miracast applications.<\/p>\n","protected":false},"excerpt":{"rendered":"
WiFi Display, also called Miracast, is an emerging technology that allows a mobile device (source) to duplicate its screen content to an external display (sink) via a peer-to-peer WiFi link. Despite its diverse application scenarios and growing popularity, Miracast consumes substantial power due to a combination of video encoding\/decoding and transmission. 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