A method performed by a wireless device in a wireless communication system, the method comprising: receiving (S1813), from a network, one or more first handover commands, wherein each of the one or more first handover commands is related to a corresponding index, and comprises a handover condition and a random access preamble for a corresponding target cell; storing (S 1815) a list of the one or more first handover commands; receiving (S1819), from the network, a second handover command related to an index; updating (S1821) the list of the one or more first handover commands based on the second handover command; identifying (S1823), in the updated list, a handover command in which a handover condition for a target cell is satisfied; and performing (S1825) a handover to the target cell based on the identified handover command, wherein the updating (S1821) of the list of the one or more first handover commands comprises: based on that the index related to the second handover command matches an index related to a first handover command in the list, replacing a first parameter value in the first handover command with a second parameter value in the second handover command; and based on that the index related to the second handover command does not match an index related to any one of the one or more first handover commands in the list, adding the second handover command to the list, and wherein, in case of the replacing, at least one parameter value of the first handover command other than the second parameter value with which the first parameter value is replaced is absent in the second handover command. receiving (S1813), from a network, one or more first handover commands, wherein each of the one or more first handover commands is related to a corresponding index, and comprises a handover condition and a random access preamble for a corresponding target cell; storing (S 1815) a list of the one or more first handover commands; receiving (S1819), from the network, a second handover command related to an index; updating (S1821) the list of the one or more first handover commands based on the second handover command; identifying (S1823), in the updated list, a handover command in which a handover condition for a target cell is satisfied; and performing (S1825) a handover to the target cell based on the identified handover command, wherein the updating (S1821) of the list of the one or more first handover commands comprises: based on that the index related to the second handover command matches an index related to a first handover command in the list, replacing a first parameter value in the first handover command with a second parameter value in the second handover command; and based on that the index related to the second handover command does not match an index related to any one of the one or more first handover commands in the list, adding the second handover command to the list, and wherein, in case of the replacing, at least one parameter value of the first handover command other than the second parameter value with which the first parameter value is replaced is absent in the second handover command. based on that the index related to the second handover command matches an index related to a first handover command in the list, replacing a first parameter value in the first handover command with a second parameter value in the second handover command; and based on that the index related to the second handover command does not match an index related to any one of the one or more first handover commands in the list, adding the second handover command to the list, and wherein, in case of the replacing, at least one parameter value of the first handover command other than the second parameter value with which the first parameter value is replaced is absent in the second handover command. <EOS>