Transmission power control with dynamic step values

Claim 2

A transmission power control system for a mobile terminal in a mobile communication network, comprising at least one radio base station coupled with a radio base station control apparatus judging an intensity of reception field strength of a radio signal of said mobile terminal, having been measured and reported from said radio base station, and providing an instruction of transmission power control to said mobile terminal, said transmission power control system for said mobile terminal comprising: a reception field strength measuring unit configured to measure an intensity of reception field strength of a radio signal being used to communicate with said radio base station in a radio zone thereof; a control unit communicatively coupled to said reception field strength measuring unit and configured to discriminate an area in said radio zone where said mobile terminal is located from a plurality of candidate areas that make up said radio zone, each candidate area being defined by a corresponding range of distances from said radio base station, the discriminating being made based on the intensity of reception field strength as measured by said reception field strength measuring unit, said control unit configured to determine a step value to be used for changing transmission power of said mobile terminal depending on the discriminated area in said radio zone, said control unit configured to detect contents of said instruction provided by said radio base station control apparatus, and said control unit configured to output transmission power control information, to increase the transmission power by the step value having been determined by the discriminated area of said mobile terminal in said radio zone when the detected contents of said instructions indicate a power increase, and to decrease the transmission power by the step value having been determined by the discriminated area of said mobile terminal in said radio zone when the detected contents of said instruction indicate a power decrease; and a transmission power control unit communicatively coupled to said control unit and configured to control output of transmission power in accordance with an output of said control unit.

Claim 3

The transmission power control system for a mobile terminal according to claim 1, said control unit further comprising: a first sub control unit configured to count up a number of sequentially same indications, whether increasing or decreasing, and configured to add a predetermined step value to the determined step value to be used for changing the transmission power of said mobile terminal when the counted number reaches a first predetermined threshold value.

Claim 4

The transmission power control system for a mobile terminal according to claim 1, wherein said plurality of candidate areas include a first candidate area which corresponds to a center of said radio zone, a second candidate area which corresponds to an outer boundary of said radio zone, and a third candidate area which is located between said first and second candidate areas.

Claim 5

A transmission power control system for a mobile terminal in a mobile communication network, comprising at least one radio base station coupled with a radio base station control apparatus judging an intensity of reception field strength of a radio signal of said mobile terminal, said reception field strength having been measured and reported from said radio base station, and providing an instruction of transmission power control to said mobile terminal, said transmission power control system for said mobile terminal comprising: a reception field strength measuring unit configured to measure an intensity of the reception field strength of a radio signal being used to communicate with said radio base station in a radio zone thereof; a control unit communicatively coupled to said reception field strength measuring unit and configured to discriminate an area in said radio zone where said mobile terminal is located, the discriminating being made based on the intensity of reception field strength as measured by said reception field strength measuring unit, said control unit configured to determine a step value to be used for changing transmission power of said mobile terminal depending on the discriminated area in said radio zone, said control unit configured to detect contents of said instruction provided by said radio base station control apparatus, and said control unit configured to output transmission power control information, to increase the transmission power by the step value having been determined by the discriminated area of said mobile terminal in said radio zone when the detected contents of said instructions indicate a power increase, and to decrease the transmission power by the step value having been determined by the discriminated area of said mobile terminal in said radio zone when the detected contents of said instruction indicate a power decrease; and a transmission power control unit communicatively coupled to said control unit and configured to control output of transmission power in accordance with an output of said control unit, said control unit further comprising: a first sub control unit configured to store a plurality of measuring results of the intensity of reception field strength of the radio signal of said radio base station, said first sub control unit configured to compare with a latest measuring result and past measuring results, being stored, of the intensity of reception field strength of the radio signal of said radio base station, and said first sub control unit configured to add a predetermined step value to the determined step value to be used for changing transmission power of said mobile terminal when an intensity difference of the comparing result exceeds a first predetermined threshold value.

Claim 6

A transmission power control system for a mobile terminal in a mobile communication network, comprising at least one radio base station coupled with a radio base station control apparatus judging an intensity of reception field strength of a radio signal of said mobile terminal, said reception field strength having been measured and reported from said radio base station, and providing an instruction of transmission power control to said mobile terminal, said transmission power control system for said mobile terminal comprising: a reception field strength measuring unit configured to measure an intensity of the reception field strength of a radio signal being used to communicate with said radio base station in a radio zone thereof; a control unit communicatively coupled to said reception field strength measuring unit and configured to discriminate an area in said radio zone where said mobile terminal is located, the discriminating being made based on the intensity of reception field strength as measured by said reception field strength measuring unit, said control unit configured to determine a step value to be used for changing transmission power of said mobile terminal depending on the discriminated area in said radio zone, said control unit configured to detect contents of said instruction provided by said radio base station control apparatus, and said control unit configured to output transmission power control information, to increase the transmission power by the step value having been determined by the discriminated area of said mobile terminal in said radio zone when the detected contents of said instructions indicate a power increase, and to decrease the transmission power by the step value having been determined by the discriminated area of said mobile terminal in said radio zone when the detected contents of said instruction indicate a power decrease; and a transmission power control unit communicatively coupled to said control unit and configured to control output of transmission power in accordance with an output of said control unit, said control unit further comprising: a first sub control unit configured to store a plurality of measuring results of the intensity of reception field strength of the radio signal of said radio base station, said first sub control unit configured to compare with a latest measuring result and past measuring results, being stored, of the intensity of reception field strength of the radio signal of said radio base station, and said first sub control unit configured to add a predetermined step value to the determined step value to be used for changing transmission power of said mobile terminal when an intensity difference of the comparing result exceeds a first predetermined threshold value.

Claim 7

The transmission power control system for a mobile terminal according to claim 4, said control unit further comprising: a first sub control unit configured to count up a number of sequentially same indications, whether increasing or decreasing, and configured to add the predetermined step value to the determined step value to be used for changing the transmission power of said mobile terminal when the counted number reaches the first predetermined threshold value.

Claim 10

The method according to claim 6, wherein said plurality of candidate areas include a first candidate area which corresponds to a center of said radio zone, a second candidate area which corresponds to an outer boundary of said radio zone, and a third candidate area which is located between said first and second candidate areas.

Claim 15

The method according to claim 9, wherein said plurality of candidate areas include a first candidate area which corresponds to a center of said radio zone, a second candidate area which corresponds to an outer boundary of said radio zone, and a third candidate area which is located between said first and second candidate areas.