An arrangement in a base station, for handling a request from a first user equipment to a radio network controller for accessing a service in a radio communications network, the base station being adapted to communicate with the first user equipment and a second user equipment over a radio link, the base station arrangement comprises:
- a receiving unit adapted to receive a first portion of an incoming signal wherein said first portion comprises a first signal sent from the first user equipment and a second signal sent from the second user equipment, the receiving unit further being adapted to interpret the first signal as being a possible service access request message or a preamble thereof if a first specific energy of the first signal exceeds a first threshold value;
- a sending unit adapted to send an acknowledgement that the possible service access request message or preamble thereof has been detected to the first user equipment;
- and
- a processing unit adapted to intentionally delay sending the first portion of the incoming signal to the radio network controller associated with the base station, the processing unit comprising:
- an identifying unit being adapted to identify the second signal in the first portion of the incoming signal while sending the first portion is delayed;
- a washing unit adapted to wash the first portion of the incoming signal by cancelling the identified second signal from the first portion of the incoming signal while sending the first portion is delayed;
- and
- an analyzing unit being adapted to decide whether the first signal is a real service access request message or a preamble thereof, or not, by comparing a second specific energy of the first signal in the washed first portion of the incoming signal with a second threshold value that is lower than the first threshold value,
- wherein the sending unit sends the acknowledgement before the analyzing unit decides whether the first signal is the real service access request message or the preamble thereof, or not.