Importance

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Abstract

This invention relates to a portable terminal equipment establishing synchronism with a control channel by intermittently receiving the control channel when the synchronism with the control channel is made off. When the synchronism with the control channel is made off, the equipment is set to a control channel receiving state for a period of time W2 every period of time t1 (ST3-ST10). When the synchronism with the control channel is not established in the receiving state which is set to N (=X+5) times (X=number of off-synchronism during the past one hour), the equipment is set to shifting to a control channel receiving state for the period of time W2 every period of time t2 (ST2 and ST11-ST18). The more frequently a user moves, the larger the time X of off-synchronism becomes and thus N becomes larger by that amount so that a time period until the interval t1 between each period of the control receiving state is shift to the interval t2, is prolonged. Therefore, when the user moves frequently and the possibility of the equipment entering the service area of the cell station from the outside is high, the control channel receiving state brings about frequently. When the user does not move frequently and the possibility of the equipment entering the service area of the cell station from the outside is low, the frequency of bring about the control channel receiving state becomes low and thus emphasis is laid on the consumption of the battery.

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First Claim