Abstract-Portable devices (such as personal digital assistants and laptops with wireless connectivity) are becoming ubiquitous. As their functionality and capabilities increase, their energy consumption requirements also increase. Yet, these devices have to operate on limited batteries. In order to maximize the battery lifetime, it is necessary to optimize the use of energy at various components of such a device. In this paper, we consider a single portable device operating on a limited battery that transmits information over an interference-limited wireless channel. We seek to optimize the power consumption on the communication radio in this device, by controlling both the operation mode and the transmission power. We model the general problem using dynamic programming, obtain the optimal solutions for insightful special cases and explore various design tradeoffs. Our work provides an analytical framework for stochastic modeling and optimization of energy spent for communications in battery-operated portable devices.
We consider transfer of video frames over a time-varying wireless channel. When the channel is good, the transmitter can send frames at a higher rate than the receiver can consume them via playout. In that case, we introduce the idea of admitting new frames even when the receiver buffer is full, by selectively evicting frames already in the buffer; we can also control the playout rate, so as to optimize the tradeoff between video distortion and the time to freeze when the channel turns bad and frames arrive at a lower rate than should be played out. The decision/control problem of whether to admit a new frame, which already stored one to evict to accommodate the new one, and at what rate to play out frames is formulated within a dynamic programming framework, and an interesting connection to the Knapsack problem is made. Application of the idea in a relevant simple system shows significant performance gains, indicating that it is a promising approach for improving video delivery performance over challenging wireless channels.
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