PORTABLE TERMINAL EQUIPMENT

摘要

Portable terminal equipment which can be synchronized with a control channel by intermittently receiving the control channel when the equipment gets out of synchronism from the control channel. When the equipment gets out of synchronism from the control channel, 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 equipment is not able to be synchronized with the control channel even when the equipment is set to the receiving state N (=X+5) times (X: number of out-of-synchronisms during the past one hour), the equipment is set to the control channel receiving state for the period of time W2 every period of time t2 (ST2 and ST11-ST18). As the user moving frequency becomes higher, the X becomes larger and the N becomes larger accordingly and, as a result, time required for the receiving interval to shift from t1 to t2 becomes longer. Therefore, when the user frequently moves and the possibility of the equipment entering the service area of the base station from the outside is high, the equipment is frequently set to the control channel receiving state. When the user does not move frequently and the possibility is low, the frequency of setting the equipment to the control channel receiving state becomes low and emphasis is laid on the consumption of the battery.