Patent ID: 7756057

Claim:
A radio communication terminal in a system wherein each of data for each of radio communication terminals is coded based on each of code keys assigned to each of the radio communication terminals, each of the coded data is stored into each of slots, a base station transmits information in units of packet including the slots, the number of slots included in the packet is predetermined, and each of the slots has a communication information area which stores necessary various information for indicating a state of the base station and for which the radio communication terminal connects to the base station, the radio communication terminal comprising: a receiving unit which receives a packet transmitted from the base station when a communication path to the base station is not established before a call connection request is transmitted to the base station; a storing unit which stores the code keys each of which is assigned to each of the radio communication terminals; and a measuring unit which measures whether each of all slots in the received packet is an unused slot or a used slot by using the coded keys which are stored in the storing unit and each of which is assigned to each the radio communication terminals, wherein a transmission rate is calculated based on information obtained from the number of used slots, the number of unused slots and each communication information included in each of the slots before the communication path is established, and the transmission rate is a rate to be actually assigned when the communication path to the base station is established after the call connection request is transmitted to the base station.