关键词: 网络时间协议, 多信道时隙, Ad Hoc, 时隙同步

Abstract: A multichannel slot structure based on Time Division Multiple Access (TDMA) in Ad Hoc network was designed. According to the basic principle of Network Time Protocol （NTP）and the new slot structure, an algorithm for slot synchronization of the whole network was proposed. The proposed algorithm inherited slot synchronization of point to multi-point wireless communication system. The initial slot time synchronization of the whole network was completed after the time adjusting of master-slave synchronization, then the step of slot interactive synchronization started. In this step, the periods of slot interactive synchronization must be set so properly according to the guard interval length, the clock differences and the moving speed of network nodes that not only the network load was not increased, but also the slot collision was avoided. Simulation results show that the proposed algorithm has minimal time deviation and can realize synchronization rapidly. The method can be applied to Ad Hoc network based on TDMA.

Key words: Network Time Protocol (NTP), multi-channel slot, Ad Hoc, slot synchronization