The invention relates to a method in a base station for handling a request from a user equipment for accessing a service in a radio communications network, the method comprising the steps of receiving a first wide time interval (305) of an incoming signal (300) comprising a first signal sent from the user equipment, the first signal extending along a first narrow time interval (310) being a part of the first wide time interval, the first narrow time interval of the first signal being a possible service access request message; searching the first wide time interval (305) and detecting that the first signal is a possible service access request message; and identifying how the first narrow time interval (310) of the first signal relates to the first wide time interval (305). The relationship will be the same for subsequent time intervals of the incoming signal (300).