CHANNEL SWITCHING METHOD IN TDMA MOBILE COMMUNICATION SYSTEM

摘要

PURPOSE:To attain zone selection with high accuracy in a short time by monitoring the quality of a slot for a control signal when degradation in the communication quality is detected, selecting a radio base station being a most suitable transfer destination, selecting the communication frequency of the radio base station and continuing the communication. CONSTITUTION:A radio channel consists of a frequency channel FC1 (control frequency channel) composed of control signal and information slots and a frequency channel F1 (communication frequency channel) comprising information slots only. The transmission/reception of the control signal is implemented through a control signal slot in a control frequency channel FC1 in radio base stations 12a-12c and the communication is implemented through information slots. Then radio mobile stations (15-1)-(15-5) switch the communication frequency channel F1 into the control frequency channel FC1 at the degradation in the communication quality and receive a control signal from plural radio base stations 12a-12c while making communication through the information slots in the channel FC1. Thus, the radio mobile stations (15-1)-(15-5) select a radio zone while making communication.