초록 ▼

Transmission power control with dynamic step value depending on a location of a mobile terminal in a radio zone is realized. The mobile terminal detects its location, whether close to a radio base station, a boundary of the radio zone, or an intermediate location, by an intensity of reception field

Transmission power control with dynamic step value depending on a location of a mobile terminal in a radio zone is realized. The mobile terminal detects its location, whether close to a radio base station, a boundary of the radio zone, or an intermediate location, by an intensity of reception field strength of a radio signal transmitted by a radio base station. The radio base station, which has received and measured the radio signal quality transmitted by the mobile terminal, instructs the transmission power control information (increasing or decreasing) to the mobile terminal in accordance with the measured radio signal quality. When "decreasing" instructions are received repeatedly at the mobile terminal when the mobile terminal is located near the radio base station, a larger step value than a normal case is used for decreasing transmission power of the mobile terminal. When "increasing" instructions are received repeatedly at the mobile terminal when the mobile terminal is located in the boundary of the radio zone, a larger step value than the normal case is used for increasing transmission power of the mobile terminal.

대표청구항 ▼

[ What is claimed is:] [1.] 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 te

[ What is claimed is:] [1.] 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; anda 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.