Abstract: In a radio network control method and device which avoid a congestion state by controlling a handover request when a transportable base station is moving, when location information is received from the transportable base station, enable/disable of a handover between the transportable base station and another base station is determined based on the location information and preset handover information per area. When handover enable is determined, information of a peripheral cell which allows a handover to the other base station is notified to a user equipment using a cell of the transportable base station based on in-use cell information per user equipment. Alternatively, information of a peripheral cell which allows a handover to the transportable base station is notified to a user equipment using a cell of a base station to which the transportable base station has moved.

Abstract: A method of connecting a line concentrator to other line concentrators in a switching system, wherein a switching unit accommodates the line concentrator is provided. The method includes the steps of analyzing a call received by the switching unit through the line concentrator, and connecting lines that are accommodated by the line concentrator and are connected to the other line concentrators without connecting through the switching unit when the call is detected to be made between the line concentrator and the other line concentrators. Thus, a call can be made to a specific dial number without connecting through the switching unit provided in the switching system. Additionally, a call can also be made by use of another switching unit when a communication path between the switching unit and the line concentrator is overcrowded.

Abstract: A method of connecting a line concentrator to other line concentrators in a switching system, wherein a switching unit accommodates the line concentrator is provided. The method includes the steps of analyzing a call received by the switching unit through the line concentrator, and connecting lines that are accommodated by the line concentrator and are connected to the other line concentrators without connecting through the switching unit when the call is detected to be made between the line concentrator and the other line concentrators. Thus, a call can be made to a specific dial number without connecting through the switching unit provided in the switching system. Additionally, a call can also be made by use of another switching unit when a communication path between the switching unit and the line concentrator is overcrowded.