Article

International Journal of Wireless Information Networks

, 16:131

First online:

Energy Efficient Reliable Data Collection in Wireless Sensor Networks with Asymmetric Links

  • Ren P. LiuAffiliated withICT Centre, CSIRO Email author 
  • , Zvi RosbergAffiliated withICT Centre, CSIRO
  • , Iain B. CollingsAffiliated withICT Centre, CSIRO
  • , Carol WilsonAffiliated withICT Centre, CSIRO
  • , Alex Y. DongAffiliated withUniversity of New South Wales
  • , Sanjay JhaAffiliated withUniversity of New South Wales

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Abstract

Field measurements reveal that radio link asymmetry has a severe impact on reliable data delivery. We analyze the energy efficiencies of selected reliability schemes for asymmetric radio links using theoretical models. The analysis provides guidelines for retransmission control so as to balance between reliability and energy consumption. We also design two enhancements to the “implicit” ARQ scheme addressing the negative effects of asymmetric radio links. The energy efficiencies of these algorithms are explicitly derived using our theoretical model and validated by simulations and field trials. Based on the analysis of the two enhanced algorithms, we propose an improvement, referred to as Energy Efficient Reliable Data Collection (EERDC) that controls the retransmissions of the enhanced ARQ schemes. Simulations and field trials confirm our theoretical findings and demonstrate that our proposed EERDC algorithm alleviates the impact of link asymmetry and achieves energy savings.

Keywords

Wireless sensor networks Energy efficiency Radio link asymmetry Implicit ARQ Reliability