초록 ▼

In case the number of usable channels is insufficient when a data communication system transmits information by using a plurality of channels, an information transmission rate reduction detector circuit included in a terminal interface circuit requests a terminal to reduce an information transmissio

In case the number of usable channels is insufficient when a data communication system transmits information by using a plurality of channels, an information transmission rate reduction detector circuit included in a terminal interface circuit requests a terminal to reduce an information transmission rate and thereby reduce the probability of call blockage of the terminal. Also, in case the number of usable channels is insufficient at the time of hand over, hand over failure of the data communication system is reduced by lowering the information transmission rate of the terminal.

대표청구항 ▼

A data communication system provided between a base station and a terminal, said data communication system receiving transmission data from said terminal and transmitting said transmission data to said base station through at least one usable channel in a plurality of channels, said data communicati

A data communication system provided between a base station and a terminal, said data communication system receiving transmission data from said terminal and transmitting said transmission data to said base station through at least one usable channel in a plurality of channels, said data communication system comprising: (a) a terminal interface which comprises: (i) means for determining whether a number of usable channels included in said at least one usable channel is sufficient for transmission of the transmission data at one of a first information transmission rate and a first source encoding rate; (ii) means for requesting said terminal to reduce an information transmission rate, at which said transmission data is transmitted, from said first information transmission rate to a second information transmission rate when the means for determining determines that the number of usable channels is insufficient for transmission at said first information transmission rate and for requesting said terminal to reduce a source encoding rate, with which said transmission data is generated, from said first source encoding rate to a second source encoding rate when said means for determining determines that the number of usable channels is insufficient for transmission at said first source encoding rate; (b) a received data converter circuit for receiving from said base station a first signal including a control signal indicating said number of usable channels; (c) timing control means for receiving from said terminal a second signal indicating a number of said plurality of channels which said terminal desires to use for transmitting said transmission data and for generating a transmission control signal which indicates said number of channels which said terminal desires to use; (d) said received data converter circuit providing said control signal to said timing control means, said timing control means detecting said number of usable channels from said control signal and informing said means for determining of said number of usable channels; and (e) a transmission data converter circuit for adding said transmission control signal received from said timing control means to the transmission data received from said terminal for transmission to said base station.