Abstract: A radio base station in a first mobile communication system is disclosed. The radio base station includes a radio communication unit; a network communication unit; and a determining unit. If a massage received by the network communication unit from a switching station indicates that a mobile station is requesting a service which is not provided in the first mobile communication system but which is provided in, a second mobile communication system and it is determined by the determining unit that a handover to the second mobile communication system cannot be conducted, the network communication unit requests the switching station to release a connection with the mobile station. Then the radio communication unit reports to the mobile station that the connection should be released in accordance with an instruction from the switching station.

Abstract: A radio control base station connected to a plurality of switching centers includes a capacity information receiving unit configured to receive capacity information from at least one of the plurality of switching centers, a load information receiving unit configured to receive load information from at least one of the plurality of switching centers, a selection ratio calculating unit configured to calculate a selection ratio for selecting a connection-target switching center to which a call from a mobile station is to be connected based on the received capacity information and the received load information, and a connection-target switching center determining unit configured to determine the connection-target switching center based on the calculated selection ratio.

Abstract: A radio communication system includes at least one user equipment, base stations, and a control station. After expiration of the timer started after establishment of the data bearer, the base station selects the access point base station for the user equipment on the basis of the voice congestion levels and indicates the access point base station to the user equipment if the voice bearer has been established, and selects the access point base station for the user equipment on the basis of the data congestion levels and indicates the access point base station to the user equipment if the voice bearer has not been established.

Abstract: A radio base station determines at least any one type of subframe constituted of multiple system information subframes for sending system information to a mobile station, paging subframes for sending paging messages for the mobile station in idle mode, or on-duration subframes corresponding to on-durations at which the mobile station receives downlink control channel signals in discontinuous reception mode for the downlink control channel signals. The radio base station allocates, to the mobile station, inter-frequency measurement periods for inter-frequency measurement at the mobile station, while avoiding simultaneous occurrence of inter-frequency measurement periods and the subframes determined by the subframe determiner.

Abstract: A base station is disclosed.

Abstract: A base station includes a connection processing unit that performs connection processes between user terminals registered in a user terminal registration unit and the base station, and between user terminals other than the user terminals registered in the user terminal registration unit and the base station; a resource amount measurement unit that measures an amount of resources utilized by the base station; and a call disconnection user terminal selecting unit that selects, when the resource amount measurement unit measures that the amount of the resources is greater than or equal to a predetermined threshold value, the user terminal for which a call is to be disconnected, among the user terminals other than the user terminals registered in the user terminal registration unit. The connection processing unit disconnects a connection with the user terminal for which the call is to be disconnected.

Abstract: A base station includes a radio communication unit (82, 85) configured to wirelessly communicate with a mobile apparatus capable of communicating in both a first mobile communication system and a second mobile communication system and a network communication unit (83, 84) configured to communicate with a switching station in the first mobile communication system, and if a line setup instruction signal (Initial Context Setup Request) received at the network communication unit from the switching station is not due to initial access to the switching station by the mobile apparatus, the radio communication unit receives mobile apparatus capability information in the second mobile communication system (UE-UTRA-Capability) from the mobile apparatus after transmitting a line setup response signal (Initial Context Setup Response) to the switching station.

Abstract: A radio base station apparatus includes a count retrieval unit configured to retrieve a call origination/reception count and a handover count within a predetermined time interval, an idle transition timer value controller configured to adjust an idle transition timer value representing a time period from completion of communication with a mobile station until the mobile station is caused to transition to an idle mode based on the retrieved call origination/termination count and the retrieved handover count, and an idle transition controller configured to cause the mobile station to transition to the idle mode based on the adjusted idle transition timer value.

Abstract: Upon detecting an opportunity to release E-RABs related to mobile stations, a mobility management entity transmits a single E-RAB release information message that collectively specifies E-RABs to be released to a base station communicating with the mobile stations. Subsequently, upon receiving the E-RAB release information message, the base station transmits a single E-RAB release information acknowledge message to the mobility management entity. Upon receiving the E-RAB release information acknowledge message, the mobility management entity updates information related to the E-RABs so that the information indicates release of the E-RABs.

Abstract: A radio communication system includes at least one user equipment, base stations, and a control station. After expiration of the timer started after establishment of the data bearer, the base station selects the access point base station for the user equipment on the basis of the voice congestion levels and indicates the access point base station to the user equipment if the voice bearer has been established, and selects the access point base station for the user equipment on the basis of the data congestion levels and indicates the access point base station to the user equipment if the voice bearer has not been established.

Abstract: A radio control base station connected to a plurality of switching centers includes a capacity information receiving unit configured to receive capacity information from at least one of the plurality of switching centers, a load information receiving unit configured to receive load information from at least one of the plurality of switching centers, a selection ratio calculating unit configured to calculate a selection ratio for selecting a connection-target switching center to which a call from a mobile station is to be connected based on the received capacity information and the received load information, and a connection-target switching center determining unit configured to determine the connection-target switching center based on the calculated selection ratio.

Abstract: To provide a base station apparatus, mobile communication system and communication control method for enabling appropriate time charging based on actual communication conditions to be performed, the base station apparatus is provided with a connection section that establishes connection with a user equipment (100n), timing sections (2084, 2085, 2011 and 20816) that measure time under charging such that the user equipment (100n) is in a state capable of communicating within a connection period during which the user equipment (100n) is in a connection state, and a charging section (2012) that determines a charging amount based on the time measured by the timing sections (2084, 2085, 2011 and 20816).

Abstract: A radio base station determines at least any one type of subframe constituted of multiple system information subframes for sending system information to a mobile station, paging subframes for sending paging messages for the mobile station in idle mode, or on-duration subframes corresponding to on-durations at which the mobile station receives downlink control channel signals in discontinuous reception mode for the downlink control channel signals. The radio base station allocates, to the mobile station, inter-frequency measurement periods for inter-frequency measurement at the mobile station, while avoiding simultaneous occurrence of inter-frequency measurement periods and the subframes determined by the subframe determiner.

Abstract: In a method for managing cyclic shift codes used for reporting the CQI, when a new communication occurs between a base station and a mobile station, a cyclic shift code is allocated to the CQI report from the mobile station in accordance with a predetermined order of precedence. When the communication has ended or been disconnected, the cyclic shift code is released. In the allocating step, a cyclic shift code is allocated to the CQI report from the mobile station for the newly occurring communication, the allocated cyclic shift code having a precedence ranking that is lower than a precedence ranking of the allocated cyclic shift code allocated latest for the CQI report from another mobile station, being not used for CQI reports from other mobile stations, and having a highest precedence ranking in the predetermined order of precedence.

Abstract: A message broadcast system for broadcasting messages to user devices includes a cell broadcast center and a base station, the cell broadcast center including a first table associating the sender identifier of a message broadcast request with a message identifier information for identifying a message to be added to the message and corresponding to a priority for controlling the order of broadcast messages, and a transmission unit for transmitting a message including the message identifier information corresponding to the sender identifier to the base station, and the base station including a second table associating the message identifier information with a priority for controlling the order of broadcast messages, and a broadcast controlling unit for controlling the order of broadcast messages based on the priority corresponding to the message identifier information obtained from the message from the cell broadcast center.

Abstract: A base station includes a connection processing unit that performs connection processes between user terminals registered in a user terminal registration unit and the base station, and between user terminals other than the user terminals registered in the user terminal registration unit and the base station; a resource amount measurement unit that measures an amount of resources utilized by the base station; and a call disconnection user terminal selecting unit that selects, when the resource amount measurement unit measures that the amount of the resources is greater than or equal to a predetermined threshold value, the user terminal for which a call is to be disconnected, among the user terminals other than the user terminals registered in the user terminal registration unit. The connection processing unit disconnects a connection with the user terminal for which the call is to be disconnected.

Abstract: A base station apparatus including a reconnection request signal receiving unit configured to receive a reconnection request signal transmitted from a mobile apparatus, the reconnection request signal being for the mobile apparatus requesting reconnection to the base station apparatus, a status detection unit configured to detect whether a status of the mobile apparatus immediately before transmitting the reconnection request signal corresponds to a status where a frequency band measurement period is activated, the frequency band measurement period causing the mobile apparatus to measure a frequency band different from a frequency band for a radio access technology for use in radio communication between the mobile apparatus and the base station apparatus, a response signal generation unit configured to generate a response signal to the reconnection request signal, the response signal generation unit generating, if the status detection unit determines that the frequency band measurement period is activated, th

Abstract: A base station includes a call connection acceptance determination unit that determines, when a call connection request signal from the user terminal is received, whether a call connection request from the user terminal is acceptable, based on an amount of resources that is used by the base station; a redirection-setting unit that sets, when the call connection acceptance determination unit determines that the call connection request from the user terminal is not to be accepted, a different base station to which the user terminal is to be redirected; and a notification unit that reports information representing the different base station that is set by the redirection-setting unit to the user terminal.

Abstract: A base station is disclosed.

Abstract: A mobile communication method according to the present invention includes the steps of: transmitting, from a mobile station (UE) to a radio base station (eNB), a connection re-establishment request signal to re-establish the connection between the radio base station (eNB) and the mobile station (UE), when the mobile station (UE) detects a failure in the connection; and transmitting, from the mobile station (UE) to the radio base station (eNB), a connection reconfiguration completion signal notifying that processing corresponding to a connection reconfiguration signal is completed, when the mobile station (UE) receives the connection reconfiguration signal from the radio base station (eNB), and when the connection reconfiguration signal contains a release request of a data radio bearer which is not established between the mobile station (UE) and the radio base station (eNB).