| description |
In this paper we present Levels, a programming abstraction for
energy-aware sensor network applications. Unlike most previous work
it does not try to maximize network lifetime but rather helps to
meet user-defined lifetime goals while maximizing application
quality. Levels is targeted to applications where there is no
redundancy and no node should fail early.
With our programming abstraction the application developer defines
so-called energy levels. These energy levels form a stack and can be
deactivated from top to bottom if the lifetime goal cannot be met
otherwise. Each code block within an energy level contains
information about its energy consumption, which can be obtained from
simulation tools without much effort. The runtime system then uses
the data about the energy consumption of the different levels to
compute an optimal level assignment for the time remaining. As we
show in the evaluation, applications using Levels can accurately
meet given lifetime goals and offer good application quality. In
addition, the runtime overhead of our system is almost negligible.
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