1. A method of performing a random access procedure over a radio interface, the method in a mobile terminal comprising:transmitting, by the mobile terminal, a synchronization request for synchronization information;
receiving, at the mobile terminal, synchronization information in response to the synchronization request;
transmitting, by the mobile terminal based on at least one transmission parameter adjusted in accordance with the synchronization information, a resource request for data transmission resources; and
using a timer mechanism providing an indication related to the validity of the at least one transmission parameter utilized by the mobile terminal to keep the mobile terminal in synchronization.