An arrangement for setting and adjusting at least one parameter in a radio communication network, said parameter being a radio link control timer value used in control of communication in said radio communication network and being set based on a round trip time for a signal travelling from a radio network controller to a user equipment and back to said radio network controller on a given link, the arrangement comprising: - an estimating module provided for initially estimating a maximum value of the round trip time for the given link, wherein the initially estimated maximum value of the round trip time corresponds to an expected worst case delay on the given link; - a setting module provided for initially setting a value of said parameter to a conservative value based on the initially estimated maximum value of the round trip time; - a measuring module provided for measuring the round trip time for the given link; - an adjusting module provided for adjusting said value of said parameter depending on the measured round trip time, wherein the adjusting module is provided for adjusting said value of said parameter by modifying said value of said parameter to conform to actual delay characteristics of the given link, and wherein the measured round trip time is expected to be shorter than the initially estimated maximum value of the round trip time, wherein said measuring module is provided for measuring the round trip time by means of: (i) gradually decreasing the initially estimated maximum value of the round trip time, (ii) repeatedly setting said parameter depending on the gradually decreased maximum value, (iii) using said repeatedly set parameter for control of communication in said radio communication network; (iv) monitoring a quality parameter of the communication in said radio communication network; and (v) determining the round trip time based on said repeatedly set parameter and the monitored quality parameter of the communication in said radio communication network, wherein spurious retransmissions as being the quality parameter are monitored, and the value of the repeatedly set parameter to be used is a value set just before the spurious retransmissions occur. - an estimating module provided for initially estimating a maximum value of the round trip time for the given link, wherein the initially estimated maximum value of the round trip time corresponds to an expected worst case delay on the given link; - a setting module provided for initially setting a value of said parameter to a conservative value based on the initially estimated maximum value of the round trip time; - a measuring module provided for measuring the round trip time for the given link; - an adjusting module provided for adjusting said value of said parameter depending on the measured round trip time, wherein the adjusting module is provided for adjusting said value of said parameter by modifying said value of said parameter to conform to actual delay characteristics of the given link, and wherein the measured round trip time is expected to be shorter than the initially estimated maximum value of the round trip time, (i) gradually decreasing the initially estimated maximum value of the round trip time, (ii) repeatedly setting said parameter depending on the gradually decreased maximum value, (iii) using said repeatedly set parameter for control of communication in said radio communication network; (iv) monitoring a quality parameter of the communication in said radio communication network; and (v) determining the round trip time based on said repeatedly set parameter and the monitored quality parameter of the communication in said radio communication network, wherein spurious retransmissions as being the quality parameter are monitored, and the value of the repeatedly set parameter to be used is a value set just before the spurious retransmissions occur.