초록 ▼

A communication system includes a master station connected to a telephone line network and a plurality of remote stations for transmitting and receiving digital data to and from the master station through a radio transmission line. Among the master station and the remote stations, one channel is div

A communication system includes a master station connected to a telephone line network and a plurality of remote stations for transmitting and receiving digital data to and from the master station through a radio transmission line. Among the master station and the remote stations, one channel is divided into a plurality of slots. One of the plurality of slots is assigned as a control slot to transmit and receive data in a time-division manner. The master station transmits control data to the remote stations by the control slot. The master station transmits control data by the control slot at every predetermined period and also transmits data concerning a communication by the control slot during a predetermined period.

대표청구항 ▼

A transmission and reception apparatus including a channel divided into a plurality of frames, each of said plurality of frames being subdivided into a plurality of slots, one slot of each of said plurality of frames being assigned as a dual-purpose slot for carrying control data or communication da

A transmission and reception apparatus including a channel divided into a plurality of frames, each of said plurality of frames being subdivided into a plurality of slots, one slot of each of said plurality of frames being assigned as a dual-purpose slot for carrying control data or communication data and the remaining slots of each of said plurality of frames being assigned as communication slots for carrying communication data, wherein control data is transmitted and received together with communication data, said apparatus comprising: transmitting and receiving means for transmitting data in the form of time-division-multiplexed data and for receiving data transmitted thereto; control means for controlling an operation of said transmitting and receiving means, said control means controlling said transmitting and receiving means to transmit said communication data in said dual-purpose slot of all subsequent ones of said plurality of frames at a time for transmitting said control data during a predetermined period after said control data is transmitted in said dual-purpose slot of a previously transmitted one of said plurality of frames, said control means controlling said transmitting and receiving means to transmit said control data in said dual-purpose slot when not transmitting said communication data, and said control means controlling said transmitting and receiving means to transmit said communication data in said communication slots in all of said plurality of frames, whereby each of said plurality of frames includes a dual-purpose slot carrying one of control data and communication data; and detecting means for detecting a mute state from an output signal supplied thereto by said transmitting and receiving means, wherein said control means controls said transmitting and receiving means to transmit said control in said dual-purpose slot of all subsequent ones of said plurality of frames while said detecting means detects said mute state.