Delay-Bounded Wireless Network Based on Precise Time Synchronization Using Wireless Two-Way Interferometry
Delay-Bounded Wireless Network Based on Precise Time Synchronization Using Wireless Two-Way Interferometry
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DOI：
10.1109/access.2021.3087866
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Yusuke Yamasaki;N. Chauvet;N. Shiga;S. Yasuda;K. Takizawa;R. Horisaki;M. Naruse
中科院分区：
文献类型：
--
作者：
Yusuke Yamasaki;N. Chauvet;N. Shiga;S. Yasuda;K. Takizawa;R. Horisaki;M. Naruse
无线网络中可靠信息传输的重要性，特别是关于通信延迟的重要性，正在急剧增加，以实现5G和后5G时代的安全和高质量通信。然而，用于无线网络的传统媒体访问控制（MAC）协议，特别是具有冲突避免的载波侦听多路访问（CSMA/CA），有时会由于其复杂的仲裁机制而产生意想不到的显著延迟，该仲裁机制假设终端之间的异步通信。由于延迟不能被确定性值严格限制，这导致依赖于无线网络的系统的脆弱性。本文利用无线双向干涉技术（Wi-Wi）实现精确的时间同步，使所有终端通过无线信号实现时间同步。我们表明，通过适当的周期性分配每个终端的数据传输定时，命名为仲裁点（AP），一个简单的仲裁算法获得了严格有界的最大值的延迟，同时确保所有参与者之间的平等。此外，我们证明了在星形拓扑无线网络中可管理的终端总数显着增加密集包装AP定时，考虑到终端的空间几何信息，这是Wi-Wi测量提供的另一个功能。与此同时，我们实验性地构建了一个星形拓扑有线网络，其中所有终端都通过Wi-Wi进行时间同步，以确认所提出的仲裁协议中确定的基本属性。这项研究为未来的无线网络铺平了一条新的道路，其中延迟是严格限制的，并提供了超可靠和高质量的信息传输功能的基础，通过利用精确的时间同步和空间定位（时空同步）。
The importance of reliable information transfer in wireless networks, especially regarding communication delay, is drastically increasing to fulfill safe and high-quality communication in the 5G and post-5G era. However, conventional media access control (MAC) protocol for wireless networks, notably Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), sometimes yields unexpectedly significant delay due to its complex arbitration mechanism assuming asynchronous communication among terminals. As the delay cannot be strictly bounded by a deterministic value, this causes a vulnerability of systems relying on wireless networks. This paper utilizes precise time synchronization achieved by Wireless Two-way Interferometry (Wi-Wi), enabling all terminals to be time-synchronized via wireless signals. We show that by an appropriate periodic assignment of each terminal’s data transmission timing, named Arbitration Point (AP), a simple arbitration algorithm obtains a strictly bounded maximum value for the delay while ensuring equalities among all participants. Furthermore, we demonstrate that the total number of terminals manageable in a star-topology wireless network significantly increases by densely packing AP timings, taking into account the spatial geometry information of terminals, which is another feature delivered by Wi-Wi measurement. In the meantime, we experimentally constructed a star-topology wired network where all terminals are time-synchronized via Wi-Wi to confirm the fundamental properties identified in the proposed arbitration protocol. This study paves a new way for future wireless networks where the delay is strictly bounded and provides the basis for ultra-reliable and high-quality information transfer functionalities by utilizing precise time synchronization and space localization (space-time synchronization).