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TDMA versus CSMA/CA for wireless multi-hop communications: A comparison for soft real-time networking

机译：用于无线多跳通信的TDMA与CSMA / CA：软实时网络的比较

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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: (i) time division multiple access (TDMA), which follows a time-triggered paradigm and (ii) 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 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.
机译：无线网络已成为行业中用于软实时数据传输的非常有吸引力的解决方案。为了使此类技术能够传输实时流量，必须确定端到端通信延迟的可靠范围，以保证适当的系统行为。对于传统的有线嵌入式和实时网络，可以利用两种主要的无线多路访问方法：（i）时分多路访问（TDMA），它遵循时间触发的范式;（ii）具有冲突避免功能的载波侦听多路访问（CSMA / CA），它遵循事件触发的范例。本文提出了两种最典型的TDMA和CSMA / CA协议在最坏情况下的端到端延迟方面的时间行为的分析比较。这种最坏情况的延迟以概率方式表示，因为我们的分析框架可以捕获无线介质的多功能性。从延迟分布中获得分析延迟界限，并将其与细粒度的模拟结果进行比较。展示的研究案例表明，取决于其设置，TDMA可以提供比CSMA / CA更大或更小的最坏情况范围。

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