摘要 |
The present invention discloses a network system, in which data is transmitted in the form of transmission frames, the system including a network control unit ( 4 ) for controlling communication in the network and a terminal ( 2 ) for receiving and transmitting data from/to the network control unit ( 4 ). When the network control unit ( 4 ) receives a request for changing from a first user data rate to a second user data rate it adds/deletes fill data (FD) to/from a transmission frame corresponding to the requested change in the user data rate for transmitting data to the terminal ( 2 ) at the second user data rate. The terminal ( 2 ) detects the change in the amount of fill data (FD) and changes the user data rate transmitted to the network control unit ( 4 ) according to the detected change. In this system, it is possible to smoothly change the data rate without affecting the quality of service. |