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This paper investigates the problem of uneven energy consumptions in a large class of many-to-one sensor networks. In a many-to-one sensor network, all sensor nodes generate Constant Bit Rate (CBR) data and send them to a single sink via multihop transmissions. This type of sensor networks has many potential applications such as environmental monitoring and data gathering. Based on the observation that sensor nodes sitting around the sink need to relay more traffic compared to other nodes in outer sub-regions, the analysis verifies that nodes in inner rings suffer much faster Energy Consumption Rates (ECR) and thus have much shorter expected lifetime.
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