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: To suppress increase in the amount of signals due to repetition of transition to a “Preservation state” and return to an “Active state,” a mobile station UE according to the present invention includes: a receiving unit 13 configured to receive access restriction information against communication satisfying a predetermined condition during the “Preservation state,” from a radio access network; and a transmitting unit 12 configured to transmit an “RRC CONNECTION REQUEST” to the radio access network in a case where the mobile station UE transitions from the “Preservation state” to the “Active state.” The transmitting unit 12 is configured to decide whether or not to transmit an “RRC CONNECTION REQUEST” for the communication satisfying the predetermined condition, on the basis of the access restriction information.

Abstract: A radio base station apparatus includes an information retrieval unit configured to retrieve information of the radio base station apparatus or information of a device that is connected to the radio base station apparatus, a timer value determination unit configured to determine, based on the retrieved information, a timer value representing a time period from termination of data communication with a mobile station until causing the mobile station to transition to an idle state; and an idle transition controller configured to cause the mobile station to transition to the idle state, based on the determined timer value.

Abstract: A radio base station (eNB) according to the present invention includes: a management unit (11) configured to manage the number of mobile stations UE corresponding to each carrier; and a scheduling unit (12) configured to perform a scheduling processing to a scheduling-target mobile station (UE#A), in which the “CA” is set to be performed, in at least one of a primary carrier (carrier #1) and a secondary carrier (carrier #2) of the mobile station UE#A based on the number of mobile stations UE corresponding to each carrier.

Abstract: The present invention enables to stop communication in a particular cell without having an impact on a mobile station UE being in a standby state. A mobile communication method according to the present invention includes a step A in which a radio base station eNB#A leads a mobile station UE being in a standby state in a cell A, which is covered by the radio base station eNB#A, to be in a standby state in a complementing cell (cells B to G) which complements coverage of the cell A, and a step B in which the radio base station eNB#A stops communication in the cell A.

Abstract: The present invention is designed to make it possible to reduce the cost required for a machine communication terminal when the network domain of the machine communication system employs an LTE system. With the radio communication method of the present invention, a radio base station apparatus allocates downlink signals to a machine communication terminal in a predetermined cycle and transmits the allocated downlink signals to the machine communication terminal, and the machine communication terminal receives downlink signals from the radio base station apparatus in the predetermined cycle and demodulates the downlink signals received in the predetermined cycle.

Abstract: A radio base station includes a resource assignment unit for assigning a resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal to a first mobile station during a semi-persistent scheduling bearer setting process. The resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal is formed by a combination of a frequency direction resource and a code direction resource by which the first mobile station transmits a transmission acknowledgement signal after a predetermined timing from a timing of receiving downlink data, to the downlink data that has been scheduled by semi-persistent scheduling and has been transmitted via a downlink data channel.

Abstract: A base station apparatus determines which mode of a subframe bundling mode (second mode) and a non-bundling mode (first mode) should be used by a user apparatus for communication, and reports a determination result. In the first mode, RTT period is a first period, and each of transmission and retransmission of the signal is performed every 1 TTI. In the second mode, RTT period is a second period that is longer than the first period, and each of transmission and retransmission of the signal is performed every plurality of TTIs. A radio resource to be used for retransmission is determined according to a first frequency hopping pattern in the first mode, and is determined according to a second frequency hopping pattern that is different from the first frequency hopping pattern in the second mode.

Abstract: A base station of a mobile communication system includes a scheduler that generates uplink grant information indicating that uplink radio resources are allocated to less than or equal to a first multiplexing number of units of user equipment, a transmitter that transmits a control signal including the uplink grant information to the user equipment, and a receiver that receives an uplink signal which is transmitted by the user equipment. When a second multiplexing number being less than the first multiplexing number or more units of the user equipment exist which transmit periodically generated periodic data, and when the user equipment exists which transmits non-periodic data generated at non-periodic timing, the scheduler generates the uplink grant information indicating that the uplink radio resources are allocated to the second multiplexing number of the units of the user equipment that transmit periodic data and to the user equipment that transmits non-periodic data.

Abstract: A base station in a mobile communication system includes: a quality information obtaining unit configured to obtain quality information indicating a radio channel state of a user apparatus; an assignment period selection unit configured to select an assignment period corresponding to the quality information of the user apparatus from a predetermined correspondence relationship between each of a plurality of choices of assignment periods for assigning radio resources to periodic data that occurs periodically and a value of quality information indicating a radio channel state; a scheduling unit configured to determine radio resources to be assigned to the user apparatus in the assignment period that is selected; and a radio communication unit configured to communicate, by radio, user data including periodic data of the user apparatus by using the radio resources determined by the scheduling unit.

Abstract: A base station in a mobile communication system includes a scheduling unit generating downlink grant information indicating that downlink radio resources should be allocated to not more than a first multiplex number of user devices; and a transmission unit transmitting control signals containing the downlink grant information and data signals mapped to the radio resources specified by the downlink grant information, wherein, when less than the first multiplex number and not less than a second multiplex number being less than the first multiplex number, of user devices that receive periodically generated periodic data as data signals exist, and user devices that receive non-periodically generated non-periodic data as data signals exist, the scheduling unit generates downlink grant information indicating that the downlink radio resources should be allocated to the second multiplex number of user devices receiving the periodic data and the user devices receiving the non-periodic data.

Abstract: A base station of a communication system includes a quality information retrieval unit that retrieves quality information indicating a radio channel state of user equipment, a threshold value determination unit that determines, for each of the user equipment, a threshold value for at least one of a data retention amount and a data retention time period, depending on the quality information, a scheduler that calculates a scheduling coefficient for the user equipment for which at least the one of the data retention amount and the data retention time period exceeds the threshold value, and that allocates a radio resource to the user equipment at least in accordance with a magnitude of the scheduling coefficient, and a notification unit that reports to the user equipment that the radio resource is allocated.

Abstract: A base station that performs radio communication with a mobile station includes an index calculation unit that calculates an index representing interference in a frequency band, wherein the frequency band is to be utilized by a different base station; a frequency band selection unit that selects the frequency band based on the index calculated by the index calculation unit, wherein, in the frequency band, the interference is less than or equal to a predetermined threshold value; and a communication unit that performs the radio communication with the mobile station in the frequency band selected by the frequency band selection unit.

Abstract: A base station includes a determination unit that determines whether user equipment performs radio communication through a booster, based on delay time of a signal transmitted to and received from the user equipment; a target SIR setting unit that sets a target SIR to be compared to a received SIR for performing transmission power control based on the received SIR of an uplink signal from the user equipment; a transmission power control signal generating unit that generates, based on the target SIR and the received SIR, a transmission power control signal to be set for controlling transmission power of the user equipment; and a transmitter that transmits the transmission power control signal to the user equipment. When determination is made that the radio communication is performed through the booster, the target SIR is set to be less than or equal to a predetermined upper limit value.

Abstract: A base station includes a first target receiving power calculation unit that calculates first target receiving power for controlling transmission power based on a path loss and a first parameter used by the user equipment transmitting user data in a predetermined sub-frame through an uplink shared channel to control the transmission power, a difference calculation unit that calculates, based on the path loss, a difference between the first target receiving power and second target receiving power used by the user equipment transmitting the user data through the uplink shared channel at every constant interval to control the transmission power, a second parameter calculation unit that calculates a second parameter by subtracting the difference from the first parameter, and a notification unit that reports the second parameter. The first target receiving power calculation unit calculates the first target receiving power to be greater as the path loss becomes smaller.

Abstract: A base station allocates a radio resource to a scheduling-target user based on a scheduling metric which is calculated for each of scheduling-target users and calculates the amount of available data for each user. When the radio resource is allocated to the scheduling-target user, the amount of data (Dassign) to be communicated using the allocated radio resource is subtracted from the amount of available data (Davailable) for the user. The amount of available data (Davailable) for each user within a cell is updated (min((Davailable+Dref), Dref)) to be less than or equal to a reference data amount in each control period (TAMBR). The scheduling-target user is selected based on the amount of available data for each user.

Abstract: A radio base station (eNB) according to the present invention includes: a management unit (11) configured to manage the number of mobile stations UE corresponding to each carrier; and a scheduling unit (12) configured to perform a scheduling processing to a scheduling-target mobile station (UE#A), in which the “CA” is set to be performed, in at least one of a primary carrier (carrier #1) and a secondary carrier (carrier #2) of the mobile station UE#A based on the number of mobile stations UE corresponding to each carrier.

Abstract: A base station apparatus includes: decoding units for an uplink control signal and an uplink shared data signal; and a reliability determination unit configured to determine a degree of reliability that predetermined information is included in the uplink control signal that is received periodically. In the case where timing of a predetermined period for the predetermined information agrees with reception timing of the uplink shared data signal, (1) whether to perform decoding by assuming that the uplink shared data signal includes the predetermined information is determined according to whether the period is equal to or less than a radio frame length, (2) if the period is longer than the radio frame length, whether to decode the uplink shared data signal by assuming that the uplink shared data signal includes the predetermined information is determined according to whether the degree of reliability is higher than a predetermined value.

Abstract: A reception quality in a radio base station eNB is estimated with a high accuracy by using a reference signal. The radio base station eNB according to the present invention includes signal power estimation units 11B, 12B, and 13B configured to calculate a correlation value Z(a) between a predetermined number N of continuous samples “a” to “a+N?1” in sequences constituting a transmitted signal XL(n) of a predetermined signal transmitted by a mobile station UE#L and a predetermined number N of continuous samples “a” to “a+N?1” in sequences constituting a received signal r(n) of the predetermined signal in the radio base station eNB, and calculate received power Spower of the predetermined signal using the correlation value Z(a).

Abstract: To avoid a reduction in a peak rate in an uplink as much as possible. A radio base station eNB according to the present invention includes a scheduling unit 12 configured to assign a PUCCH resource, a PUSCH resource, and a PRACH resource to a mobile station UE in a cell subordinate to the radio base station eNB, wherein, when the number of mobile stations UEs in the cell is 1, the scheduling unit 12 is configured to use at least one of the PUCCH resource and the PRACH resource as the PUSCH resource.