Mobile communication system, mobile terminal, transmit power control method in a mobile terminal, and program

Abstract

The invention discloses a method of performing transmit power control which is performed based on ISCP (interference signal code power) which a mobile terminal calculates from a downlink received signal. A transmission / reception unit of the mobile terminal transmits and receives a radio signal to / from a radio base station through an antenna. A transmission / reception control unit performs control relating to the signal processing in the transmission / reception unit. A control unit performs control concerning operation of each unit of the mobile terminal. A measurement unit measures ISCP and DPCH power from the signal received in the transceiver unit, and transmits the measured values to the control unit. A characteristic value conversion unit prepares a relation between the ISCP which satisfies a preset target BLER (block error rate) and the measured DPCH power, based on BLERs previously measured in a communication environment where the mobile terminal is located. A storage unit stores programs and individual data. A display unit displays inputted / outputted information. An input unit includes key switches and others. An audio signal processing unit performs a conversion process between a modulation signal and an audio signal during a voice call.

Description

technical field [0001] The present invention relates to transmission power control of a downlink dedicated physical channel (DPCH) in a mobile communication system using wideband code division multiple access (W-CDMA). Background technique [0002] In the W-CDMA mobile communication system, a technology called closed-loop transmission power control is used, which uses both inner-loop power control and outer-loop power control (for example, see 3GPP TS 25.214V4.1.0 (2001-06 )). [0003] In this closed-loop transmit power control, the receiving end measures the quality of the communication channel and sends a transmit power control (TPC) signal based on the measurement result by using a dedicated physical control channel (DPCCH) in the line back to the transmitting end. The transmitting end receives the TPC signal, and controls the transmission power value of the communication channel in transmission based on the UP / DOWN command attached to the TPC signal. Therefore, the tra...

AI Technical Summary

Problems solved by technology

However, if an error occurs, the increase of the target SIR cannot reach the correct value

[0008] Therefore, in the transmission power control using the inner loop power control and the outer loop power control, the transmission power control suitable for the communication environment cannot be performed because the inner loop power control is different from the outer loop power control in terms of the update period of the power control. huge difference

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