Base transceiver station and channel rate control method based on radio quality, channel quality and CPU load

A channel rate control method comprising:

• in a base transceiver station including a memory that stores a table including a plurality of CPU utilization thresholds and a data rate reduction amount corresponding to each of the plurality of CPU utilization thresholds,
• obtaining radio quality between a radio access network and a mobile terminal apparatus;
• obtaining channel quality between the base transceiver station and a radio network controller;
• measuring CPU utilization in the base transceiver station;
• calculating permissible data amount based on the radio quality, the channel quality, the CPU utilization, and the data rate reduction amounts corresponding to the CPU utilization thresholds stored in the memory;
• and
• transmitting the permissible data amount from the base transceiver station to the radio network controller;
• and
• in the radio network controller, controlling a channel rate between the radio network controller and the base transceiver station based on the permissible data amount, wherein
• the base transceiver station is a small-size base transceiver station where the number of carriers is 1 or less, and is limited in a number of maximum concurrent connections.