Abstract: In a handover of a mobile station (12) from a base station (14-1) to a base station (14-2), the base station (14-2) determines ANCH2 to be allocated to the mobile station of a operation frequency band of the base station (14-2), and notifies the mobile station of the determined ANCH2 via a CCH. The mobile station shifts, when a timeslot of ANCH2 is different from a timeslot of ANCH1, a operation frequency band of the mobile station in the timeslot of ANCH2 from a operation frequency band of the base station (14-1) to a frequency band which contains ANCH2. The mobile station then establishes a connection to the base station (14-2) via ANCH2, disconnects the connection to the base station (14-1), and completely shifts the operation frequency band to the frequency band of the base station (14-2).

Abstract: In a handover of a mobile station (12) from a base station (14-1) to a base station (14-2), the base station (14-2) determines ANCH2 to be allocated to the mobile station of a operation frequency band of the base station (14-2), and notifies the mobile station of the determined ANCH2 via a CCH. The mobile station shifts, when a timeslot of ANCH2 is different from a timeslot of ANCH1, a operation frequency band of the mobile station in the timeslot of ANCH2 from a operation frequency band of the base station (14-1) to a frequency band which contains ANCH2. The mobile station then establishes a connection to the base station (14-2) via ANCH2, disconnects the connection to the base station (14-1), and completely shifts the operation frequency band to the frequency band of the base station (14-2).

Abstract: A communication path between base stations connected via a network is switched so that data received by a mobile station that is during handover is not interrupted. A mobile station (14-1) which has started a radio communication with a handover destination base station (12-2) switches a acquisition destination of data transmitted from a mobile station (14-2) with which the mobile station (14-1) communicates from a handover source base station (12-1) to the handover destination base station (12-2). After this, the mobile station (14-1) transmits a communication path switching request to a base station (12-3) which performs a radio communication with the mobile station (14-2). In response to the communication path switching request transmitted from the mobile station (14-1), the base station (12-3) releases an RTP session established with respect to the handover source base station (12-1).

Abstract: A communication path between base stations connected via a network is switched so that data received by a mobile station that is during handover is not interrupted. A mobile station (14-1) which has started a radio communication with a handover destination base station (12-2) switches a acquisition destination of data transmitted from a mobile station (14-2) with which the mobile station (14-1) communicates from a handover source base station (12-1) to the handover destination base station (12-2). After this, the mobile station (14-1) transmits a communication path switching request to a base station (12-3) which performs a radio communication with the mobile station (14-2). In response to the communication path switching request transmitted from the mobile station (14-1), the base station (12-3) releases an RTP session established with respect to the handover source base station (12-1).

Abstract: A base station (12A-1) notifies a management server (16) of termination of an emergency call. The management server (16) specifies the location registration area of the mobile terminal with the emergency call terminated, based on the notice, and instructs base stations (12A-1) and (12A-2) belonging to the specified location registration area to hold a line to be allocated to a callback for the emergency call. Each of the base stations (12A-1) and (12A-2) holds a line to be allocated to a callback for the emergency call, based on the line hold instruction.

Abstract: A base station device (12) is capable of multiplex communications with a plurality of mobile station devices using space division multiple access on a communication channel at a specified carrier frequency, receives a start request for multiplex communications from the mobile station device in accordance with a presence or absence of another communication signal on the communication channel, and allocates the communication channel to the mobile station device that has made the start request in response to the start request. The base station device (12) includes a transmission control unit (22) for performing intermittent transmission of communication signals to the mobile station device already in communication on the communication channel among the plurality of mobile station devices.