Power saving with passive standby mode using bitmap-based activity logs for energy-efficient set-top box


A collection-high box (STB) will increase its energy efficiency with active standby and passive standby modes. Compared to the active standby mode, the passive standby mode saves a lot of power by turning off more STB functions, however it ends up in longer activation latency. For an energyefficient STB, during this paper, power saving with the passive standby is studied. The STB operates the passive standby mode when it is not in use, and the passive standby mode is switched to the active standby mode before a user turns on the STB so as to cut back the activation latency. To try and do that, the passive standby uses activity logs, that are represented during a bitmap kind, to find a user pattern and to predict the next user activity. Within the presented power saving method with the passive standby, recent activities is reflected with a lot of weights to quickly find a new user pattern, rather than waiting until activity logs for a new user pattern are accumulated. The strategy is evaluated via simulations and discussed1.

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