Method of setting up a call connection, a method of preventing or alleviating denial of service attacks, a ratio telecommunications network, and a base station

A method of preventing or alleviating denial of service attacks on a base station of a telecommunications network including a user terminal by the base station upon receipt of first call setup request from the user terminal ignoring any subsequently received call setup requests from the user terminal that are received during a predetermined period.

A radio telecommunications network comprising a base station and a user terminal, operative such that upon receipt of a first call setup from the user terminal, the base station ignores any subsequently received call setup requests from the user terminal received during a predetermined period.

A radio telecommunications base station operative such that upon receipt of an initial call setup from a user terminal, the base station sends a response and ignores any subsequently received call setup requests from the user terminal that are received during a predetermined period.

A method of setting up a call connection from a base station of a radio telecommunications network in which upon receipt of a first call setup request ignores subsequently received call setup requests received during a predetermined period.