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In wireless networks, sleep mode based power saving mechanisms can reduce the energy consumption at the expense of additional packet delay. This letter analyzes its packet queueing delay and wireless terminals' energy efficiency. Based on the analysis, optimal sleep window size can be derived to optimize terminal energy efficiency with delay constraint. key words: sleep mode, queueing delay, energy efficiency, sleep window size selectiondoi:10.1587/transcom.e93.b.1069 fatcat:uz4gaxeasnhnddm6q7j4al6vdi