GTS allocation analysis in IEEE 802.15.4 for real-time wireless sensor networks

We propose two accurate models of service curves for a Guaranteed Time Slot allocation as a function of the IEEE 802.15.4 parameters

A. Koubaa; M. Alves; E. Tovar


Scholarcy highlights

  • With the emergence of new Wireless Sensor Network applications under timing constraints, the provision of deterministic guarantees may be more crucial than saving energy during critical situations
  • We propose two alternative models for the service curve provided by a Guaranteed Time Slot allocation, and derive the corresponding delay bounds
  • We show that the stair service curve βCst,aTir can be simplified to a basic rate-latency service curve βR,T, where R is the guaranteed bandwidth of one time slot GTS
  • We observe that the guaranteed bandwidth is slightly above 13 kbps, except for low superframe orders
  • We have proposed a methodology for analyzing the Guaranteed Time Slot mechanism provided by the IEEE 802.15.4 protocol
  • Using Network Calculus formalism, we have proposed two accurate models for the service curve provided by a GTS allocation and derived the delay bounds guaranteed by such an allocation
  • The impact of the beacon order and the superframe order on the maximum throughput and delay bound was analyzed

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