CDMA transmission power control capable of preventing call disconnection and degradation of capacity of subscribers

摘要

In a CDMA mobile communication system comprising a base station (100) and a mobile station (200), the mobile station (200) receives a channel assignment message from the base station (100) to start, using a reverse traffic channel, transmission of a fixed data information signal so as to facilitate reception of a signal on the reverse traffic channel in the base station (100). The base station (100) transmits transmission power control bits of a fixed pattern irrespective of a received energy until up to receive the fixed data information signal to make an open loop control of the reverse transmission power so as to gently increase the reverse transmission power in the mobile station (200). On reception of the fixed data information signal from the mobile station (200), the base station (100) switches the reverse transmission power control from the open loop control to a closed loop control on the basis of the received energy of a signal on the reverse traffic channel from the mobile station to make the closed loop control of the reverse transmission power of the mobile station (200).