US 7,480,518 B2Granted

Mobile communication terminal and method of controlling signal-transmission power

AssigneeNEC Corporation

InventorTatsuyuki Shintani

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Abstract

A mobile communication terminal includes a de-spreader which de-spreads signals received from a base station, a RAKE-synthesizer which RAKE-synthesizes the de-spread signals, a SIR detector which measures a SIR of the received signals, a SIR comparator which compares a SIR of the received signals to a target SIR, a quality detector which measures quality of the received signals at a predetermined interval, a quality comparator which compares the quality of the received signals, transmitted from that quality detector, with target quality, the quality comparator lowering the target SIR, if the quality of the received signals is higher than the target quality, and raising that SIR, if the quality of the received signals is lower than the target quality, and a controller which stores a minimum target SIR therein, and varies the minimum SIR in accordance with a relation between the target SIR and the quality of the received signals.

Claims20

Dependent claims

A mobile communication terminal comprising:

a de-spreader which de-spreads signals received from a base station;
a RAKE-synthesizer which RAKE-synthesizes the signals having been de-spread by said de-spreader;
a SIR detector which measures a SIR (signal to interference power ratio) of the received signals, based on the signals having been RAKE-synthesized by said RAKE-synthesizer;
a SIR comparator which compares a SIR of the received signals to a target SIR;
a bit producer which produces a signal in accordance with which said base station controls power at which signals are transmitted, in accordance with the comparison result transmitted from said SIR comparator, and transmits said signal to said base station;
a quality detector which measures quality of the received signals at a predetermined interval;
a quality comparator which compares the quality of the received signals, transmitted from said quality detector, with target quality,
said quality comparator lowering said target SIR, if said quality of the received signals is higher than said target quality, and raising said SIR, if said quality of the received signals is lower than said target quality;
and
a controller which stores a minimum target SIR therein, and varies said minimum SIR in accordance with a relation between said target SIR and said quality of the received signals.

7 more elements

A method of controlling power at which a base station transmits signals to a mobile communication terminal, comprising:

(a) de-spreading signals received from a base station;
(b) RAKE-synthesizing the signals having been de-spread in said step (a);
(c) measuring a SIR (signal to interference power ratio) of the received signals, based on the signals having been RAKE-synthesized in said step (b);
(d) comparing a SIR of the received signals to a target SIR;
(e) producing a signal in accordance with which said base station controls power at which signals are transmitted, in accordance with the comparison result of said step (d), and transmitting said signal to said base station;
(f) measuring quality of the received signals at a predetermined interval;
(g) comparing the quality of the received signals, having been measured in said step (f), with target quality,
(h) lowering said target SIR, if said quality of the received signals is higher than said target quality, or raising said SIR, if said quality of the received signals is lower than said target quality;
and
(i) setting a minimum SIR, and varying said minimum SIR in accordance with a relation between said target SIR and said quality of the received signals.

7 more elements

Dependencies are inferred from the claim text.