Abstract: Area quality information is collected from a user terminal without applying an excessive traffic load to a system. Operation maintenance center (OMC) (307) transmits a confirmation signal to a wireless access terminal AT (305) through a base transceiver station BTS (301), and receives a wireless access terminal identifier from the wireless access terminal. The OMC stores the received identifier of the wireless access terminal correspondingly to an identifier of the base transceiver station. In a case where a performance value acquired from the BTS is a previously determined limit value or less, the OMC reads the identifier of the wireless access terminal corresponding to the identifier of the base transceiver station. The OMC transmits an acquisition instruction of information to the wireless access terminal.

Abstract: When an access terminal is handed off, requested-data-rate information based on a data rate control signal from each access terminal, average throughput of each access terminal before handoff, and a handoff request count are obtained from a base transceiver subsystem. A throughput after handoff of each access terminal is estimated from a ratio of the data rate information of each access terminal to the number of connected access terminals, and an estimated throughput ratio representing the degree of change from the average throughput of each access terminal before handoff to the estimated throughput is calculated. If the estimated throughput ratio is lower than or equal to a given value, the corresponding access terminal is not handed off. If the estimated throughput ratio is higher than the given value, the access terminal having the highest estimated throughput among access terminals requesting handoff is handed off.

Abstract: Area quality information is collected from a user terminal without applying an excessive traffic load to a system. Operation maintenance center (OMC) (307) transmits a confirmation signal to a wireless access terminal AT (305) through a base transceiver station BTS (301), and receives a wireless access terminal identifier from the wireless access terminal. The OMC stores the received identifier of the wireless access terminal correspondingly to an identifier of the base transceiver station. In a case where a performance value acquired from the BTS is a previously determined limit value or less, the OMC reads the identifier of the wireless access terminal corresponding to the identifier of the base transceiver station. The OMC transmits an acquisition instruction of information to the wireless access terminal.

Abstract: Handoff is conventionally carried out in accordance with radio reception statuses such as C/I, so that handoff to a congested station can be made, resulting in a decrease in throughput. When an access terminal is handed off, requested-data-rate information based on a data rate control signal from each access terminal, average throughput of each access terminal before handoff, and a handoff request count are obtained from a base transceiver subsystem. A throughput after handoff of each access terminal is estimated from a ratio of the data rate information of each access terminal to the number of connected access terminals, and an estimated throughput ratio representing the degree of change from the average throughput of each access terminal before handoff to the estimated throughput is calculated. If the estimated throughput ratio is lower than or equal to a given value, the corresponding access terminal is not handed off.