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首页> 外文期刊>WSEAS Transactions on Communications >Opt-TDMA/DCR: Optimized TDMA Deterministic Collision Resolution Approach for Hard Real-Time Mobile Ad hoc Networks
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Opt-TDMA/DCR: Optimized TDMA Deterministic Collision Resolution Approach for Hard Real-Time Mobile Ad hoc Networks

机译：Opt-TDMA / DCR：用于硬实时移动自组织网络的优化TDMA确定性冲突解决方法

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摘要

A new kind of critical applications, using Mobile Ad hoc networks, has appeared. These applications such as vehicular or robotic ones are called Hard Real Time Applications. Their major requirement is to respect the real time constraints especially the deadlines on the treatment and the communication delay. However, providing real-time communication, with predictable delay, is a challenge because of the Ad Hoc network features, particularly the node's mobility. In this paper, we propose a new medium access protocol (which we call: Opt-TDMA/DCR) for these hard real time applications. Our approach consists in a distributed protocol considering dynamic network topology with mobile nodes. It is based on the TDMA protocol which we optimize by reducing the TDMA frame size. The reduction of the slot number of the TDMA frame is made with the "modulo" function which is used to select slots for transmission. However, this will probably lead to collisions between nodes selecting the same slots. Hence, a deterministic collision resolution procedure will then be applied to make communication with distinct slots. In order to verify the respect of real time constraints by our protocol, we made a communication delay analysis in the worst case and in the average case.
机译：已经出现了一种使用移动自组织网络的新型关键应用程序。这些应用程序，例如车辆或机器人应用程序，称为硬实时应用程序。他们的主要要求是遵守实时约束，尤其是治疗的最后期限和通信延迟。但是，由于Ad Hoc网络功能，尤其是节点的移动性，以可预测的延迟提供实时通信是一项挑战。在本文中，我们针对这些硬实时应用提出了一种新的媒体访问协议（称为Opt-TDMA / DCR）。我们的方法是在分布式协议中考虑带有移动节点的动态网络拓扑。它基于我们通过减小TDMA帧大小进行优化的TDMA协议。使用“取模”功能减少TDMA帧的时隙数量，该功能用于选择要发送的时隙。但是，这可能会导致选择相同时隙的节点之间发生冲突。因此，然后将应用确定性冲突解决程序来与不同的时隙进行通信。为了验证我们的协议对实时约束的尊重，我们在最坏情况和平均情况下进行了通信延迟分析。

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