Dynamic Power Management with Scheduled Switching Modes

  • Authors:
  • Paulo Sérgio Sausen;José Renato de Brito Sousa;Marco Aurélio Spohn;Angelo Perkusich;Antônio Marcus Nogueira Lima

  • Affiliations:
  • Universidade Regional do Noroeste do Estado do Rio Grande do Sul (UNIJUí), Departamento de Tecnologia, Caixa Postal 530, 98.700-000 Ijuí, RS, Brazil;Centro Federal de Educação Tecnológica do Ceará (CEFETCE), Fortaleza, CE, Brazil;Federal University of Campina Grande (UFCG), Computer Science Department, Av. Aprigio Veloso, S/N, 58109-970 Campina Grande, PB, Brazil;Federal University of Campina Grande (UFCG), Electrical Engineering Department, Campina Grande, PB, Brazil;Federal University of Campina Grande (UFCG), Electrical Engineering Department, Campina Grande, PB, Brazil

  • Venue:
  • Computer Communications
  • Year:
  • 2008

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Abstract

A Wireless Sensor Network (WSN) comprises many sensor nodes each one containing a processing unit, one or more sensors, a power unit, and a radio for data communication. Nodes are power constrained, because they run on batteries which usually cannot be replaced due to the nature of the applications. We present a novel dynamic power management approach, named Dynamic Power Management with Scheduled Switching Modes (DPM-SSM), derived from a more realistic analysis of the battery capacity recovery effect and the switching energy. This was only possible thanks to the application of a more realistic battery model (i.e., Rakhmatov-Vrudhula battery model). We also devised a Hybrid Differential Petri Nets formalism to evaluate our power management solution. Preliminary results showed the potential for improving the battery lifetime by taking advantage of the battery recovery effect when a node transitions to a sleeping state mostly after packet transmissions. DPM-SSM provides several DPM modes which are triggered depending on the battery remaining capacity. Simulations results show that, depending on the scheduling approach, DPM-SSM can provide real battery power recovery without compromising the timeliness of the applications running on the sensor network.