Patent ID: 6181955
Filing Date: 2001-01-30
Classification: H01Q,H04W

Abstract:
A method of transmitting a control signal by a base station of a digital cellular mobile radio system, said base station comprising at least one array of a plurality of antennas (261 to 268) for dynamically creating a beam (31) transmitting said control signal, said transmit beam (31) being adapted to assume different angular positions (33) within a predetermined angular range (32), a plurality of transmit subsystems (201 to 208) being associated with said plurality of antennas (261 to 268), each transmit subsystem (201 to 208) including phase modulator means (221) and phase-shifter means (222), each antenna (261 to 268) transmitting a signal supplied by an associated one of said transmit subsystems (201 to 208) on the basis of said control signal and contributing to the creation of said beam (31), characterized in that said method includes the following step:allocating (11) to said control signal, in at least one of said transmit subsystems, a predetermined specific time shift so that said transmit beam (31), called a vibrating beam (31), assumes in succession at least some (33) of said different angular positions and enables isotropic broadcasting of said control signal in said angular range (32).