分散無線ネットワークの同期の現状と課題

摘要

Due to current diversity of applications in wireless distributed networks, various network synchronization methods have been proposed. One of them is already widely used as TSF (Timing Synchronization Function) in IEEE 802.11 MAC. In this presentation, I take up some of these existing synchronization methods for discussion, to evaluate their advantages and hidden troubles. Then, for particular application (i.e., decentralized TDMA, power-save mode, and high-resolution synchronization, etc), I consider its suitability of each synchronization method, and possible modifications for better performance. Further, based on our experiments, I introduce some current status and challenges arising in real applications of wireless sensor networks.%最近の分散無線ネットワークの多様化に伴い，これまでIEEE802．11のTSF（timing synchronization function）を中心に様々なネットワーク同期プロトコルが提案されてきている．本講演では，まず，これらの同期プロトコルを姐上に乗せ，その長所，問題点を明らかにする．また，特定の応用（分散TDMA ．端末の省電力制御，高精度の同期が必要となる場合の対応等）で，これらの同期プロトコルがどのように関連し，変形されるべきか検討する．さらに現場で期待されている応用について，実機での検証から現状と課題を紹介する．