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TDMA versus CSMA/CA for wireless multi-hop communications: a stochastic worst-case delay analysis

Authors
  • Wang, Qi
  • Jaffres-Runser, Katia
  • Xu, Yongjun
  • Scharbarg, Jean-Luc
  • An, Zhulin
  • Fraboul, Christian
Publication Date
Apr 01, 2017
Source
Open Archive Toulouse Archive Ouverte
Keywords
Language
English
License
Green
External links

Abstract

Wireless networks have become a very attractive solution for soft real-time data transport in the industry. For such technologies to carry real-time traffic, reliable bounds on end-to-end communication delays have to be ascertained to warrant a proper system behavior. As for legacy wired embedded and real-time networks, two main wireless multiple access methods can be leveraged: one is time division multiple access (TDMA), which follows a time-triggered paradigm, and the other is carrier sense multiple access with collision avoidance (CSMA/CA), which follows an event-triggered paradigm. This paper proposes an analytical comparison of the time behavior of two representative TDMA and CSMA/CA protocols in terms of the worst-case end-to-end delay. This worst-case delay is expressed in a probabilistic manner because our analytical framework captures the versatility of the wireless medium. Analytical delay bounds are obtained from delay distributions, which are compared to fine-grained simulation results. Exhibited study cases show that TDMA can offer smaller or larger worst-case bounds than CSMA/CA depending on its settings.

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