US 2004/0203993 A1 · CDMA mobile communication system in which updating of a reference value for controlling closed-loop transmission power is realized in a base transceiver station

Abstract

A CDMA mobile communication system is disclosed in which a reference value that is used in a closed-loop transmission power control is updated in base transceiver stations. The updating of an uplink signal target SIR value that serves as the reference in closed-loop transmission power control is performed independently at base transceiver stations and is not performed at the base station controller. At the base transceiver station, when a decoder detects a loss of synchronization of a user signal from a mobile station, a demodulator adds a step value ASIR that has been set in advance to the uplink signal target SIR value that has been reported from the base station controller to obtain an uplink signal target SIR provisional value, and when this uplink signal target SIR provisional value is smaller than an uplink signal target SIR maximum value that has been set in advance, the uplink signal target SIR value is updated to the uplink signal target SIR provisional value.

Claims6

Dependent claims

A method of controlling transmission power in a CDMA mobile communication system wherein an uplink signal target SIR value that serves as the reference in closed-loop transmission power control is updated in a base transceiver station;

said method comprising the steps of:
when a loss of synchronization of a user signal from a mobile station is detected, adding a predetermined step value ASIR to an uplink signal target SIR value that has been reported from a base station controller and making the result an uplink signal target SIR provisional value;
and
if this uplink signal target SIR provisional value is smaller than an uplink signal target SIR maximum value that has been set in advance, updating the uplink signal target SIR value that serves as the reference for closed-loop transmission power control to said uplink signal target SIR provisional value.

1 more element

A CDMA communication system provided with at least one mobile station that communicates with a base transceiver station via radio signals, a base station controller for controlling base transceiver stations, and a base transceiver station for implementing closed-loop transmission power control using, as a reference, an uplink signal target SIR value that has been reported from said base station controller;

wherein said base transceiver station comprising:
a means for adding a step value ASIR that has been set in advance to the uplink signal target SIR value that has been reported from said base station controller and uses the result as an uplink signal target SIR provisional value, when a loss of synchronization of a user signal from said mobile station is detected;
and
a means for updating the uplink signal target SIR value that serves as a reference in closed-loop transmission power control to said uplink signal target SIR provisional value, when this uplink signal target SIR provisional value is smaller than an uplink signal target SIR maximum value that has been set in advance.

1 more element

Dependencies are inferred from the claim text.

CDMA mobile communication system in which updating of a reference value for controlling closed-loop transmission power is realized in a base transceiver station

Life of this patent

CDMA mobile communication system in which updating of a reference value for controlling closed-loop transmission power is realized in a base transceiver station

Life of this patent

Abstract

Claims6