US 6,556,839 B1Granted

Apparatus for and method of controlling transmission power

AssigneeNEC Corporation

InventorTakayuki Kondo

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Abstract

A reversely spreading unit 11 reversely spreads a digitally converted reception signal by using an assigned spreading code. A reception power and interference power measuring unit 14 calculates a reception power from a mobile station and/or an interference power. A total reception power calculator 3 calculates a total reception power that is a sum of reception signals of respective channels received at one reception antenna 6. Also, an SIR calculator 15 uses the total reception power, and the reception power from the mobile station and/or the interference power, and then calculating a signal to interference ratio (SIR) of the reception signal. A transmission power control information calculator 16 calculates a transmission power control information so that SIR of the reception signal approaches a necessary SIR.

Claims18

Dependent claims

An apparatus for controlling a transmission power, comprising:

an antenna which receives a plurality of reception signals from a plurality of mobile stations;
a plurality of processors which processes said plurality of reception signals from said antenna to determine reception powers, respectively;
and
a total reception power calculator which calculates a total reception power based on said reception power outputted from each of said plurality of processors;
wherein each of said plurality of processors includes:
a reversely spreading unit which spreads said reception signal received by said antenna by using an assigned spreading code;
a reception power measuring unit which calculates said reception power based on the reversely spread reception signal outputted from said reversely spreading unit;
an SIR calculator which calculates a signal to interference ratio (SIR) of said reception signal based on said reception power calculated by said reception power measuring unit and said total reception power calculated by said total reception power calculator;
a transmission power control information calculator which calculates transmission power control information to make said SIR outputted from said SIR calculator equal to a predetermined SIR;
and
a transmission section which transmits said transmission power control information calculated in said transmission power control information calculator to one of said plurality of mobile stations.

8 more elements

An apparatus for controlling a transmission power, comprising:

an antenna which receives a plurality of reception signals from a plurality of mobile stations;
a plurality of processors which processes said plurality of reception signals from said antenna to determine interference powers, respectively;
and
a total reception power calculator which calculates a total reception power based on said interference power outputted from each of said plurality of processors;
wherein each of said plurality of processors includes:
a reversely spreading unit which spreads a reception signal received by said antenna by using an assigned spreading code;
an interference power measuring unit which calculates said interference power based on the reversely spread reception signal outputted from said reversely spreading unit;
an SIR calculator which calculates a signal to interference ratio (SIR) of said reception signal based on said interference power calculated by said interference power measuring unit and said total reception power calculated by said total reception power calculator;
a transmission power control information calculator which calculates transmission power control information to make said SIR outputted from said SIR calculator equal to a predetermined SIR;
and
a transmission section which transmits said transmission power control information calculated in said transmission power control information calculator to one of said plurality of mobile stations.

8 more elements

Dependencies are inferred from the claim text.