Bandwidth control in a mobile group communication system

摘要

A method transmitting and receiving data other than voice data and preventing deterioration in quality of communication voice data due to transmission and reception of the other than voice data, and utilizing a limited communication bandwidth when a plurality of users conduct the broadcast communication through common use of the conference room on the network. Upon a user terminal (2T) transmitting second data, verifying whether any of a plurality of identified user terminals has a right of transmission of first data. The method further includes that upon a user terminal having the a transmission right of first data, setting a value obtained by subtracting the communication bandwidth required for transmission of the first data from the communication bandwidth which each user terminal can use as the communication bandwidth for transmission of the second data. Upon no user terminal having a transmission right of first data , setting a communication bandwidth that each user terminal can use as the communication bandwidth for transmission of the second data.