Abstract: A hierarchical structure generating method and apparatus used in a communication system (for example, consisting of a parent station B and N child stations (relay station R or terminal station T) is disclosed, by which the whole hierarchical structure can be efficiently generated and displayed from the top level based on a parent-child relationship table between the constituent stations.

Abstract: A hierarchical structure generating method and apparatus used in a communication system (for example, consisting of a parent station B and N child stations (relay station R or terminal station T) is disclosed, by which the whole hierarchical structure can be efficiently generated and displayed from the top level based on a parent-child relationship table between the constituent stations.

Abstract: A radio communication system comprises a master station for carrying out a bidirectional communication between the master station and a slave station in time division multiple access. The master station comprises comparator circuit for producing a phase difference data between a slave frame signal of a of a slave transmission signal and a master frame signal of a master transmission signal. A first detecting circuit produces a first detection signal representative of whether or not a field strength level is less than a predetermined level. The phase difference data and the first detection signal are transmitted to the slave station. The slave station comprises a delay circuit for give a delay to the slave transmission signal in accordance with a given phase difference. A supplying section is responsive to the first detection signal to selectively supply the delay means with the phase difference data as the given phase difference.

Abstract: Each of the repeater stations comprises a frame synchronization circuit, a loop-back circuit and a repeater number calculating circuit. The repeater number calculating circuit calculates the second repeater number thereof depending on the number of layers from the master station based on the first repeater number when the repeater station is in frame synchronization as determined by the frame synchronization circuit. The repeater number calculating circuit equalizes the second repeater number thereof to the first repeater number irrespective of the number of layers from the master station when the repeater station is in frame asynchronization as determined by the frame synchronization circuit.

Abstract: In a multiple access communication system comprising a central station, at least one repeater station, and at least one terminal station, each of the central, the repeater, and the terminal stations has each station number. The central station transmits a central downward signal comprising a central number signal representative of the station number of the central station to the repeater station. The repeater station separates the central number signal from the central downward signal. The repeater station transmits a repeater downward signal comprising a repeater number signal representative of the station number of the repeater station to the terminal station. The terminal station separates the repeater number signal from the repeater downward signal as a separated repeater number signal. The terminal station transmits an upward signal to the repeater station.

Abstract: A downward transmission line D and an upward transmission line U are provided with a control channel CCH and n pieces of voice channels VCH1-VCHn respectively. Control channel use flag data 101 showing a "free" or "engaged" state of the channel, mode data 102 showing "a control channel retention mode" or "a call-out mode", call-out station number data 103 showing "a station number of a call-out tributary station", transmission voice channel number data 104 showing "a number of voice channel for transmission", reception voice channel number data 105 showing "a number of voice channel for reception", and call-in subscriber number data 106 showing "a subscriber number of a call-in subscriber", are multiplexed on the control channel CCH. Voice channel use flag data 201 showing a "free" or "engaged" state of the cannel and voice data 202 being individual data are multiplexed on each of the voice channels VCH1-VCHn.