FIELD: radio engineering, communication.
SUBSTANCE: in the terminal device, the used sub-channel selection unit (206) has a correspondence table between the reception quality of pilot signals divided into classes and the sub-channel allocated to the classes. According to the correspondence table, the used sub-channel selection unit (206) selects a sub-channel group of RACH correlated to the measurement result of the reception quality of the pilot signals reported from a reception quality measurement unit (205). One sub-channel to be used for transmitting an access request signal is selected from the selected sub-channel group.
EFFECT: eliminating collision of access request signals simultaneously transmitted from communication terminal devices in a local cell, preventing generation of an interference signal in a neighbouring cell and improving throughput in the local cell.
15 cl, 15 dwg
