Apparatus of a base station, said apparatus comprising monitoring means adapted to monitor if a cell is being started; selecting means adapted to select a temporary physical cell identifier among a predefined pool of temporary physical cell identifiers; instructing means adapted to instruct the cell to adopt the selected temporary physical cell identifier as the physical cell identifier of the cell if the cell is being started; determining means adapted to determine a permanent physical cell identifier for the cell, wherein the permanent physical cell identifier does not belong to the predefined pool and is different from each used physical cell identifier, wherein each of the used physical cell identifiers is indicated in a respective measurement report received while the cell is instructed to adopt the selected temporary physical cell identifier; time checking means adapted to check if at least one of a first time has elapsed after the cell has been instructed to adopt the selected temporary physical cell identifier and a second time has elapsed after the cell has been started; replacing means adapted to replace the selected temporary physical cell identifier by the determined permanent physical cell identifier as the physical cell identifier of the cell if the at least one of the first time and the second time has elapsed; evaluating means adapted to evaluate a number of used physical cell identifiers indicated in a predefined number of measurement reports received after the cell was instructed to adopt the selected temporary physical cell identifier; and setting means adapted to set at least one of the first time and the second time based on the number of used physical cell identifiers if the respective one of the first time and the second time is not predefined. monitoring means adapted to monitor if a cell is being started; selecting means adapted to select a temporary physical cell identifier among a predefined pool of temporary physical cell identifiers; instructing means adapted to instruct the cell to adopt the selected temporary physical cell identifier as the physical cell identifier of the cell if the cell is being started; determining means adapted to determine a permanent physical cell identifier for the cell, wherein the permanent physical cell identifier does not belong to the predefined pool and is different from each used physical cell identifier, wherein each of the used physical cell identifiers is indicated in a respective measurement report received while the cell is instructed to adopt the selected temporary physical cell identifier; time checking means adapted to check if at least one of a first time has elapsed after the cell has been instructed to adopt the selected temporary physical cell identifier and a second time has elapsed after the cell has been started; replacing means adapted to replace the selected temporary physical cell identifier by the determined permanent physical cell identifier as the physical cell identifier of the cell if the at least one of the first time and the second time has elapsed; evaluating means adapted to evaluate a number of used physical cell identifiers indicated in a predefined number of measurement reports received after the cell was instructed to adopt the selected temporary physical cell identifier; and setting means adapted to set at least one of the first time and the second time based on the number of used physical cell identifiers if the respective one of the first time and the second time is not predefined.