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Overview: This paper studies the two-tiered Wireless Sensor Network (WSN) architecture and proposes the optimal cluster association algorithm for it to maximize the overall network lifetime. A two-tiered WSN is formed by number of small Sensor Nodes (SNs), powerful Application Nodes (ANs), and Base-Stations (BSs, or gateways). SNs capture, encode, and transmit relevant information to ANs, which then send the combined information to BSs. Presuming the locations of the SNs, ANs, and BSs are fixed, the paper discusses how to unite the SNs to ANs such that the network life span is maximized while every node meets its bandwidth requirement.
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