Method for fast acknowledgement and identification of a service access request message or a preamble thereof

摘要

A method is provided in a base station for handling a request from a first user equipment for accessing a service in a radio communications network. The method comprises the steps of receiving a first time interval of an incoming signal comprises a first signal sent from the first user equipment and a second signal sent from the second user equipment, interpreting the first signal as being a possible service access request message preamble, and sending an acknowledgement, that the preamble is detected, to the first user equipment. The method comprises the further steps of delaying the first time interval of the incoming signal, identifying the second signal in the first time interval of the incoming signal during the delay, washing the identified second signal away from the first time interval of the incoming signal during the delay, and deciding whether the possible preamble is a real preamble or not, by analyzing the washed incoming signal.

主权项

1. A method 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 also communicating with a second user equipment over a radio link, the method comprising the steps of:
receiving a first portion of an incoming signal, the first portion comprising a first signal sent from the first user equipment and a second signal sent from the second user equipment, detecting 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; sending an acknowledgement, that the possible service access request message or the preamble thereof has been detected, to the first user equipment; intentionally delay sending the first portion of the incoming signal to the radio network controller associated with the base station; identifying the second signal in the first portion of the incoming signal while the sending of the first portion is delayed; washing the first portion of the incoming signal by cancelling the identified second signal from the first portion of the incoming signal while the sending of the first portion is delayed; and deciding 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 acknowledgement is sent to the first user equipment before deciding whether the first signal is the real service access request message or the preamble thereof, or not.