SYSTEM FOR LIMITING USE OF CDMA MOBILE RADIO DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a system which can be installed, even at a place where the use of a mobile radio device is limited, such as a train and a conference room and which controls the transmission power of interference waves, to dissolve excessive electric waves or insufficient transmission power. SOLUTION: This system comprises an interference wave device 20 which generates an interference signal B201, which is different from a control signal A101 of a radio base station 10 and transmits it to a CDMA mobile radio device B40. The interference signal B201 is generated by first finding PN(pseudo- random noise) series from the control signal A101 received by the interference wave device 20 and then time-shifting a signal generated by the interference wave device 20 by the PN series.