초록 ▼

In a cellular radio system having in each of a plurality of cells at least one base station communicating with mobile stations located within its area, the base stations each transmit a pilot signal to the mobile stations. At least one of the base stations, transmits to the mobile stations by transm

In a cellular radio system having in each of a plurality of cells at least one base station communicating with mobile stations located within its area, the base stations each transmit a pilot signal to the mobile stations. At least one of the base stations, transmits to the mobile stations by transmitting a pilot signal by using a rather narrow changing antenna beam. The angle of the greatest gain of the antenna beam is controlled in such a way that the antenna beam sweeps the cell area. The mobile stations can use the pilot signal in the identification of a base station, and as an indicator of a need for handover, without the continuous reception of the pilot signal in the subscriber equipment, and without a need to transmit the pilot signal with a higher transmission power than the other signals.

대표청구항 ▼

[ We claim:] [1.] A method for transmitting a pilot signal in a cellular radio system, which has in each of a plurality of cells at least one base station communicating with mobile stations located within a respective cell area, comprising:said base stations each transmitting a data signal in a down

[ We claim:] [1.] A method for transmitting a pilot signal in a cellular radio system, which has in each of a plurality of cells at least one base station communicating with mobile stations located within a respective cell area, comprising:said base stations each transmitting a data signal in a downlink transmission direction by using radiation patterns that change in time;said base stations each transmitting a respective pilot signal on a respective common control channel to respective mobile stations;in transmitting said respective pilot signal, each base station using at least one narrow, changing antenna beam having an angle of greatest gain; andeach base station, in transmitting said respective pilot signal, directing said angle of greatest gain of each respective antenna beam in such a way that said respective antenna beam sweeps said respective cell areas the sweeping of the beam is synchronized to a frame structure of each said base station.