| 摘要 |
<p>A mobile communication system that can preliminarily inform a user of the possibility of an occurrence of interruption of a call, which is peculiar to the system of the TDMA type. In this mobile communication system, a CPU (16) measures a received level of speech quality by detecting data representing speech quality in an SACCH frame on the basis of a result of analysis of a received frame by means of a receiving portion (11). In the case where the received level is less than a predetermined value, a counting portion (17) is caused to start counting. If the received level is low in the case of the next SACCH frame, the count is incremented. When the count reaches a predetermined value, a speaker (18) serving as alarming means is operated so as to produce a warning tone. Thereby, a warning is given to a person who is currently using the system. <MATH></p> |
