On link asymmetry and one-way estimation in wireless sensor networks

  title={On link asymmetry and one-way estimation in wireless sensor networks},
  author={Lifeng Sang and Anish Arora and Hongwei Zhang},
Link asymmetry is one of the unique challenges that wireless sensor networks pose in the design of network protocols. We observe, based on testbed experiments, that a substantial percentage of links are asymmetric, many are even unidirectional. We also find that the reliability of synchronous acknowledgments is considerably higher than that of asynchronous messages. Thus the norm of estimating link quality bidirectionally via asynchronous beacons underestimates the link reliability of… CONTINUE READING
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