Exploiting spatial correlation at the link layer for event-driven sensor networks

Chih Yu Lin, Yu-Chee Tseng*, Ten H. Lai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Wireless Sensor Networks (WSNs) can generally be classified into two categories: time-driven and event-driven. In an event-driven WSN, sensors report their readings only when they detect events. In such behaviour, sensors in the event area may suffer from higher contention. In this paper, we solve this problem by jointly considering two sub-issues. One is exploiting the spatial correlation of sensor data and the other is designing a specific MAC protocol. We propose a novel hybrid TDMA/CSMA protocol with the following interesting features that differentiate itself from traditional TDMA-based protocols: (1) the TDMA part is based on very loose time synchronisation and is triggered by the appearance of events; (2) the slot assignment strategy associated with the TDMA part takes the spatial correlation of sensor data into consideration and thus allows less strict slot allocation than conventional TDMA schemes. Simulation results show the efficiency of the proposed protocol.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalInternational Journal of Sensor Networks
Issue number1
StatePublished - 1 Jan 2012


  • CSMA
  • Medium access control
  • Spatial correlation
  • TDMA
  • Wireless sensor network

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