Performance Analysis of 802.11e Burst Transmissions with FEC Codes over Wireless Sensor Networks

  • Authors:

  • Jong-Suk Ahn;Jong-Hyuk Yoon;Young-Im Cho

  • Affiliations:

  • Department of Computer Engineering, Dong-Guk University, Seoul, South Korea;Department of Computer Engineering, Dong-Guk University, Seoul, South Korea;Department of Computer Science, University of Suwon, Suwon, South Korea

  • Venue:
  • ICESS '07 Proceedings of the 3rd international conference on Embedded Software and Systems
  • Year:
  • 2007

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Abstract

WSNs (Wireless Sensor Network) can employ a burst technique known as 802.11e TXOP (Transmission Opportunity) operation to send sensor data backlogged during the sleep period [1] and FEC (Forward Error Correction) techniques to resist against their high BER (Bit Error Rate) [2]. This paper extends the 802.11e evaluation model [3], [4] to accurately calculate the performance of two TXOP schemes such as BI (Basic Immediate ACK) and BB (Basic Block ACK) with FEC codes. The generalized model accounts for the effect of propagation errors negligible in wireless LANs, the impact of HOB (Head-Of-Block) collision, and the effect of adopting FEC codes. This paper evaluates this extended model over real WSN channels abstracted by Gilbert model. The numerical calculations over real WSN traces confirm that the inclusion of HOB collisions causes the throughput difference of BB by up-to 194% comparing to [3]. They also predicts a trade-off between the performance improvement and the overhead of FEC codes over WSN channels.