The invention relates to a method in a first radio base station for determining a performance state of a first cell served by the first radio base station, which first radio base station is comprised in a radio communications network. The method comprises determining traffic statistics of the first cell, comparing the traffic statistics with a threshold value, when the determined traffic statistics goes beyond the threshold value, transmitting a data request to a second radio base station requesting data retrieved in or associated with a second cell to be used to determine performance state of the first cell, receiving a data response indicating the requested data from the second radio base station, and determining the performance state of the first cell based on the data response.