A list of \u201chot topics\u201d may be provided to a user to indicate information that is currently popular. The method comprises setting a timer’s expiry time, transmitting a radio resource request message to a base station, starting the timer and retransmitting the radio resource request message to the base station if a radio resource allocation message is not received until the timer expires, wherein the expiry time may be set variably based on a communication state. Each square contains a color and number.