US 6,311,059 B1 · Mobile radio station

Abstract

A mobile radio station for use in a mobile radio network in which the rate at which neighboring radio base stations are monitored can be reduced for power saving purposes without significantly degrading cell reselection performance. A reception field strength of a current cell and of signals transmitted from radio base stations neighboring the current cell. If the reception field strength of a current cell is less than a first threshold that has been previously determined, a rate of decrease of reception field strength of the current cell is determined. If the rate of decrease exceeds a second threshold, the reception field strengths of signals transmitted from a maximum number that previously determined of radio base stations from among neighboring radio base stations are measured. If the reception field strength of a current cell is over the first threshold or if the rate of decrease is under the second threshold, the reception field strengths of signals transmitted from a number of radio base stations less than the maximum number from among neighboring radio base station are measured.

Claims22

Dependent claims

A mobile radio station comprising:

a measuring unit, provided with a full monitoring mode which measures reception field strengths of a signal transmitted from a maximum number of previously determined radio base stations from among neighboring radio base stations, and a reduced monitoring mode which measures a reception field strength of a signal transmitted from a number of radio base stations less than said maximum number from among neighboring radio base stations, and periodically measures a reception field strength of a current cell and of signals transmitted from radio base stations neighboring the current cell by one of said two modes;
a determining unit that determines the rate of decrease of the reception field strength of the current cell measured by said measuring unit;
a comparator which compares the rate of decrease determined by said determining unit with a threshold that has been previously determined;
and
a selecting unit that selects said full monitoring mode of said measuring unit when the rate of decrease of reception field strength of the current cell measured by said measuring unit exceeds said threshold, and selecting said reduced monitoring mode when the rate of decrease of reception field strength of the current cell measured by said measuring unit do not exceed said threshold.

2 more elements

Dependencies are inferred from the claim text.

Mobile radio station

Life of this patent

Mobile radio station

Life of this patent

Abstract

Claims22