Embodiments herein relate to a method in a radio base station for transmitting an information signal in a radio communications network. The radio base station is arranged to operate in a time structure associated with a clock and arranged to transmit an information signal associated with the time structure. The radio base station is in the radio communications network. The radio base station transmits the information signal repeatedly with a first frequency over a first period of time. Then, the radio base station transmits the same information signal repeatedly with a second frequency over a second period of time, wherein the first frequency is lower than the second frequency and the first period of time is longer than the second period of time.