Patent ID: 8514706

Claim:
A radio communication system comprising a radio base station and a radio network controller, wherein the radio base station assigns station-specific sequence numbers to uplink user data received from a radio terminal, the radio network controller transmits the radio base station a congestion signal indicating that a link between the radio base station and the radio network controller is congested, in response to detection of a sequence error of the sequence numbers, and the radio base station transmits the radio terminal a transmission rate reduction signal instructing to reduce the transmission rate of the uplink user data in response to the congestion signal, the radio network controller activates a signal transmission suppression timer to suppress transmission of the congestion signal, when a second radio base station is added as a radio base station with which the radio terminal is to communicate in addition to a first radio base station, and suspends the transmission of the congestion signal to the first radio base station and the second radio base station until the signal transmission suppression timer expires.