Power-efficiency and transmission delay are critical for periodical data gathering applications in wireless sensor networks. This paper presents a scalable power-efficient data gathering protocol with delay guaranty (PDGPDG) for wireless sensor networks. The protocol attempts to balance the energy consumption and transmission delay by dividing the entire network into clusters and then organizing clusters as sub-chains. The parallel transmission among different clusters minimizes the delay and routing data along near optimal sub-chain in the clusters reduces the total energy dissipation. PDGPDG is efficient in the ways that it prolongs the lifetime of network, as well as it takes much lower time to finish a transmission round. Simulation results show that it demonstrates about 200% better performance than that of LEACH in terms of network lifetime and improves the energy×delay metric by a factor of 2~6 compared to PEGASIS.
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