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Duty cycling and data aggregation are widely used energy management techniques in sensor networks. In this paper, we investigate structure free aggregation in duty cycle sensor networks, which is used for reporting random events sensed by sensor nodes to a fixed sink. The objective is to optimize energy consumption as well as the event reporting time (ERT). To achieve the objective, first, an aggregation aware mixed integer linear formulation (named AMIP) is proposed. Later, three aggregation aware strategies have been proposed which are based on: distance of nodes to the sink node, link quality of nodes and both link quality and distance (hybrid). Finally, AMIP is used to optimize parameters for the proposed aggregation strategies. The techniques are implemented in Contiki operating system and are tested over Cooja network simulator as well as on a real test bed. It has been observed that the hybrid …