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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 carryin

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 the reception timing of the frame signal, such that the response signal arrives at the central equipment unit within the delay measurement window field of the next frame signal. The central equipment unit measures a delay time between the transmission timing of the next frame signal and the reception timing of the response signal, and transmits transmission timing adjustment information based on the measured delay time, and address information of the terminal equipment unit, in an address field of the next frame signal. The terminal equipment unit transmits a subframe signal to the central equipment unit after a time interval, depending on the transmission timing adjustment information, from the reception timing of a frame signal.

대표청구항 ▼

A communication network system comprising: a central equipment unit; a plurality of terminal equipment units, each having at least one terminal device connected thereto; and a signal transmission line connected between said central equipment unit and said terminal equipment units, and having an up l

A communication network system comprising: a central equipment unit; a plurality of terminal equipment units, each having at least one terminal device connected thereto; and a signal transmission line connected between said central equipment unit and said terminal equipment units, and having an up link and a down link, said central equipment unit comprising means for providing periodical reference timings; and means for transmitting a frame signal, consisting of a delay measurement window field and a data field wherein subframe information signals are arranged on a time-division multiplexing basis, onto said down link each time the reference timing arrives, the delay measurement window field of the frame signal having an address field carrying address information designating one of said terminal equipment units for a measurement of a delay time of a signal transmission between said central equipment unit and the terminal equipment unit; each of said terminal equipment units comprising means for transmitting a response signal onto said up link, after a delay of a predetermined time interval from the reception timing of the frame signal, transmitted from said central equipment unit and having the address field carrying address information designating itself, such that the response signal arrives at said central equipment unit within the delay measurement window field of the next frame signal, the response signal carrying self address information; said central equipment unit further comprising means for measuring a delay time between the reference timing for transmitting the next frame signal and the reception timing of the response signal; and means for transmitting transmission timing adjustment information based on the measured delay time, and address information of said terminal equipment unit, which has transmitted the response signal, in the address field of the next frame signal; and each of said terminal equipment units further comprising means for transmitting a subframe signal after a time interval, depending on the transmission timing adjustment information, from the reception timing of a frame signal.