A method for handling of cell identities, performed by a first radio node of a wireless communication network, wherein the first radio node provides radio coverage to a first cell, the first radio node being connected to at least one second radio node (530, 540, 550, 560, 570), each second radio node providing radio coverage to a second cell (531, 541, 551, 561, 571), wherein the first cell has been assigned a first cell identity, and each of the second cells has been assigned an individual cell identity, the method comprising: determining, based on information on the first cell identity and on the cell identities assigned to the second cells (531, 541, 551, 561, 571), that the first cell identity is the same as the cell identity assigned to one of the second cells, based on the result of the determining, triggering change of cell identity for the first cell, from the first cell identity to a second cell identity that is not used for any of the second cells, wherein the change of cell identity is triggered at a time point corresponding to a time delay from the determining to the triggering that is dependent on a total number of vacant cell identities for the first cell so that the time delay is shorter the more vacant cell identities there are for the first cell, and wherein the method further comprises sending, to the at least one second radio node, information on the change of cell identity from the first cell identity to the second cell identity, characterized by that; the time delay from the determining to the triggering of the change of cell identity comprises a first time delay dependent on the number of vacant cell identities for the first cell, and a second time delay that is shorter than a difference between two first time delays for two consecutive number of vacant cell identities, wherein the second time delay is added to or subtracted from the first time delay.. determining, based on information on the first cell identity and on the cell identities assigned to the second cells (531, 541, 551, 561, 571), that the first cell identity is the same as the cell identity assigned to one of the second cells, based on the result of the determining, triggering change of cell identity for the first cell, from the first cell identity to a second cell identity that is not used for any of the second cells, wherein the change of cell identity is triggered at a time point corresponding to a time delay from the determining to the triggering that is dependent on a total number of vacant cell identities for the first cell so that the time delay is shorter the more vacant cell identities there are for the first cell, and wherein the method further comprises sending, to the at least one second radio node, information on the change of cell identity from the first cell identity to the second cell identity, characterized by that; the time delay from the determining to the triggering of the change of cell identity comprises a first time delay dependent on the number of vacant cell identities for the first cell, and a second time delay that is shorter than a difference between two first time delays for two consecutive number of vacant cell identities, wherein the second time delay is added to or subtracted from the first time delay..