System for adjusting signal transmission timing to prevent signal collisions

Abstract From the Canadian patent

In a communication network system a central, equipment unit transmits, over a down link a frame, signal carrying subframe information signals addressed to respective terminal equipment units on a time-, division multiplexing basis. The frame signal consists of a delay measurement window field carrying address information designating one of the terminal equipment units for delay measurement and a data field carrying the subframe information signals addressed to the terminal equipment units. When a terminal equipment unit is polled from the central equipment unit to measure the delay time, it transmits a response signal to the central equipment unit after a predetermined time interval from …