Patent ID: 7047003

Claim:
A mobile communication system comprising: a network host processor; a plurality of cells; and a mobile unit, wherein said plurality of cells include a monitor set cell and a plurality of active set cells, said mobile unit includes a controller for reporting, to said network host processor through said plurality of active set cells, occurrence of an event related to cell replacement when the communication level of said monitor set cell becomes equal to or higher than the sum total of the communication level of the worst active set cell having the lowest communication level among said plurality of active set cells and a predetermined threshold previously determined, and said controller includes: first setting means for defining a predetermined range with respect to the communication level of the best active set cell having the highest communication level among said plurality of active set cells; and second setting means for setting said predetermined threshold at a first value when the communication level of said monitor set cell does not fall within said predetermined range, and at a second value lower than said first value when the communication level of said monitor set cell falls within said predetermined range.