Patent ID: 7787880

Claim:
A radio network controller, which reports a neighbor cell list, including information on neighbor cells which become candidates of a hard handover partner with frequency information to be used by respective neighbor cells, to a user equipment which requested a hard handover in a mobile communication system using different frequencies, comprising: a frequency filtering controller which performs filtering processing, upon receipt of a request for a hard handover from the user equipment, to produce a reduced neighbor cell list by using information on frequencies supported by the user equipment indicated in the information having been reported in advance by the user equipment as UE capability indication information, and use priority data on frequencies stored as office data which is predetermined by a network operator, so that a number of frequencies in the reduced neighbor cell list become equal to or less than a number which is predetermined in the mobile communication system; and a call controller which determines whether a compressed mode is necessary or not for the frequencies in the reduced neighbor cell list, which has been produced in the frequency filtering controller, with referring to the UE capability indication information, and reports the reduced neighbor cell list to the user equipment, wherein the use priority data on frequencies is constructed of frequency band priority where use priority for every frequency band is defined, and frequency priority where use priority for every frequency is defined, and the frequency filtering controller comprising: a UE capability indication filtering processor which executes processing of leaving only cells, which use frequency bands included in the UE capability indication information, in a temporarily reduced neighbor cell list; a frequency band filtering processor which executes processing of deleting cells, which use frequency bands other than a frequency band with the highest frequency band priority, from the temporarily reduced neighbor cell list which has been processed by the UE capability indication filtering processor; and a frequency filtering processor which executes processing of selecting a number of frequencies, which is equal to or less than the predetermined number, according to the frequency priority, and producing the reduced neighbor cell list including only cells using the selected frequencies.