Synchronized TDMA in multi hop network to stabilize transmission time

In this article, transmission time in multi hop networks is discussed. In general, transmission times caused by a router vary according to the router's load and traffic of networks. So when two nodes communicate with each other via some routers, real-time property can never be ensured even if these nodes are a part of subnet organized by conventional factory communication systems. To stabilize the transmission time, this article propose to revise factory communication protocols so as to synchronize the assignment of time-slots for a periodical communication for each side segments of routers. A very simple example of synchronized time-slot assignment method is also shown.