Abstract: During a transition procedure from a first communication system to a second communication system, when the priority of a second communication call, whose setup is requested, is the first priority, the second communication system does not set up the bearer of a first communication call between the second communication system and the mobile communication terminal, and notifies the first communication system that the setup of the first communication is not possible, but the setup of the second communication call is possible. When notified that the setup of the first communication is not possible, but the setup of the second communication call is possible, the first communication system aborts the handover procedure, and instructs the mobile communication terminal to switch to the second communication system by another procedure.

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 system information creating unit that creates first system information for barring communication and second system information for not barring; a timing determination unit that classifies user equipment into groups based on timings of the user equipment being in an idle mode to be activated in every discontinuous reception period, and that determines, for each of the groups, a timing of transmitting a paging signal; and a transmitter that transmits the paging signal to the user equipment of some of the groups, and subsequently the first system information; that switches transmission of the first and second system information, so that a ratio between a number of transmitting the first system information and that of the second system information corresponds to a barring ratio; and that transmits the paging signal to the user equipment of the some of the groups, and subsequently the second system information.

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: 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: A base station determines a restriction rate for each of plural kinds of restrictions; by using a timing at which a user device in idle mode wakes up in a discontinuous reception cycle, groups the user device into one of a total number of groups and determine a timing for transmitting a paging signal for each of the groups; determines a restriction group number that is less than a sum of all restriction-rate-corresponding group numbers where one of the restriction-rate-corresponding group numbers corresponds to the restriction rate of one of the plural kinds of restrictions, determines the restriction group number of groups as restriction target groups, and changes a group corresponding to the restriction-target groups in each of predefined periods; and transmits the paging signal to the user device that belongs to one of the restriction-target groups, and transmits system information indicating that the plural kinds of restrictions are applied.

Abstract: A base station includes a system information creating unit that creates first system information for barring communication and second system information for not barring; a timing determination unit that classifies user equipment into groups based on timings of the user equipment being in an idle mode to be activated in every discontinuous reception period, and that determines, for each of the groups, a timing of transmitting a paging signal; and a transmitter that transmits the paging signal to the user equipment of some of the groups, and subsequently the first system information; that switches transmission of the first and second system information, so that a ratio between a number of transmitting the first system information and that of the second system information corresponds to a barring ratio; and that transmits the paging signal to the user equipment of the some of the groups, and subsequently the second system information.

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: Even when a general user's mobile station in communication enters a use-prohibited cell, the use of the use-prohibited cell is prevented while the communication is being maintained. Regarding a mobile station 100 that enters an area of a cell C12 under handover restriction, the connection utilizing the use-prohibited cell is prohibited and handover of the mobile station is performed to an effectively-operating cell C22 covering an area including the current position of the mobile station within the use-prohibited cell and having another frequency. Alternatively, the handover is performed to a base station of an effectively-operating cell C32 belonging to another mobile communication system.

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