Abstract: A mobile communication system 100 includes a selection unit 25 configured to select a transition target frequency from the plurality of frequencies when a condition under which a mobile communication terminal not utilize a transition source frequency being any of the plurality of frequencies is fulfilled, and an instruction unit 22 configured to instruct the mobile communication terminal to perform a transition to the transition target frequency selected by the selection unit. The selection unit 25 excludes the transition source frequency from a frequency candidate to be utilized by the mobile communication terminal until an elapsed time after the instruction of the transition to the transition target frequency exceeds a predetermined time.

Abstract: A UE 10 includes a storage unit 12 configured to store a specific cell accessible by the mobile communication unit and a neighboring cell element for identifying a neighboring cell provided around the specific cell, while associating the specific cell and the neighboring cell element with each other, a search unit 14 configured to search for the specific cell accessible, and a registration unit 13 configured to register a element for identifying a transition source cell as the neighboring cell element, when the UE 10 is transitioned from the transition source cell to the specific cell stored in the storage unit 12.

Abstract: A UE 10 includes a storage unit 12 configured to store a specific cell accessible by the mobile communication unit and a neighboring cell element for identifying a neighboring cell provided around the specific cell, while associating the specific cell and the neighboring cell element with each other, a search unit 14 configured to search for the specific cell accessible, and a registration unit 13 configured to register a element for identifying a transition source cell as the neighboring cell element, when the UE 10 is transitioned from the transition source cell to the specific cell stored in the storage unit 12.

Abstract: A mobile communication system 100 includes a selection unit 25 configured to select a transition target frequency from the plurality of frequencies when a condition under which a mobile communication terminal not utilize a transition source frequency being any of the plurality of frequencies is fulfilled, and an instruction unit 22 configured to instruct the mobile communication terminal to perform a transition to the transition target frequency selected by the selection unit. The selection unit 25 excludes the transition source frequency from a frequency candidate to be utilized by the mobile communication terminal until an elapsed time after the instruction of the transition to the transition target frequency exceeds a predetermined time.

Abstract: A specific network apparatus 20 includes a collection unit 22 configured to collect neighboring base station information configured such that a neighboring public cell radio base station provided in the neighborhood of the specific cell is identifiable, and a communication unit 21 configured to notify a public cell network apparatus 30 of the neighboring base station information based on a re-establishment request message received via the specific cell from a UE10 whose access to the specific cell is restricted. The network apparatus 30 selects a reselection target public cell to be utilized by the UE10 among a plurality of public cells owned by the neighboring public cell radio base station.

Abstract: A network apparatus 20 includes a specific cell information management unit 22 configured to manage information on a specific cell for each of the plurality of public cells, the specific cell having a service area overlapping with the service area of the public cell and using the same frequency as the public cell, a communication unit 21 configured to receive a communication request signal from a mobile communication terminal visiting any of the plurality of public cells, and a selection unit 24 configured to select a communication frequency to be used by the mobile communication terminal among the communication frequencies of the plurality of public cells based on the information managed by the specific cell information management unit in response to the communication request signal from the mobile communication terminal.

Abstract: A control device 100 of the present invention includes: a holding unit 500 configured to hold a communication-disconnected cell; a selection unit 700 configured to make priority of the communication-disconnected cell lower than priority of the other frequency cells and to select a frequency cell with which a target mobile station 900 is to communicate, when it is determined that the predetermined condition is satisfied; and a notification unit 300 configured to notify the target mobile station 900 of the frequency cell selected by the selection unit 700 and the holding unit 500 is configured to hold the frequency cell notified by the notification unit 300, as the communication-disconnected cell when a control signal from the target mobile station 900 is not received through the frequency cell within a predetermined time period.