Abstract
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).
Highlights
W ITH the increasing demand for wireless communications anywhere at any time, local wireless networks are overwhelmingly deployed
The proposed method fits into the category of arbitration named CSMA; it should be emphasized that what is unique is that a periodic timing named Arbitration Point (AP) is assigned to each terminal based on precise time synchronization
ARBITRATION FOR WIRELESS COMMUNICATIONS BASED ON PRECISE TIME SYNCHRONIZATION: CSMA/AP-T This section demonstrates the details of CSMA/AP-T designed for a star-topology wireless network where all terminals can send information definitely within a guaranteed bounded delay time based on precise time synchronization by Wireless Two-way Interferometry (Wi-Wi)
Summary
W ITH the increasing demand for wireless communications anywhere at any time, local wireless networks are overwhelmingly deployed. We examine a single startopology wireless network based on precise time-space synchronization using Wi-Wi. The proposed protocol utilizes carrier sense and allows multiple access, as discussed in detail . The proposed protocol utilizes carrier sense and allows multiple access, as discussed in detail In this regard, the proposed method fits into the category of arbitration named CSMA; it should be emphasized that what is unique is that a periodic timing named Arbitration Point (AP) is assigned to each terminal based on precise time synchronization. This paper experimentally constructed a star-topology wired network consisting of one access point and two terminals, wherein all of them are time-synchronized thanks to WiWi. we demonstrate a reduced time difference among devices using Wi-Wi, which is necessary for information transfer based on CSMA/AP-T to achieve collisionfree communications while providing equal performances between terminals.
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