Patent ID: 6954651

Claim:
A radio terminal device for use in a radio communication system in which packet communications are carried out by setting up one or more connections between the radio terminal device and a radio base station, the radio terminal device comprising: a packet receiving unit configured to receive packets from the radio base station through the connections; a time counter configured to read current time; and a timeout control unit configured to store a timeout interval for each connection and a timeout timing for each connection, to update the timeout timing with a new timeout timing with respect to each connection when a received packet is not a last packet, the new timeout timing being calculated by adding the timeout interval to the current time read by the time counter, and to carry out a timeout control in which a packet that is not received completely through one connection by the time the current time reaches the timeout timing with respect to the one connection is regarded as lost, wherein when said timeout control unit detects a change in a number of active connections that are currently carrying out communications with the radio base station said timeout control unit calculates a new timeout interval, and sets the new timeout interval to each connection.