Abstract: The mobile communication system performs communication by using a plurality of subframes between a radio terminal and a radio base station. The radio terminal comprises: a reception unit that receives offset information indicating an interval between a first subframe and a second subframe that is later than the first subframe on a time axis out of the plurality of subframes; and a control unit that applies assignment information included in the first subframe to the second subframe, not to the first subframe.

Abstract: A mobile communication system comprises: a switching control unit that controls switching of communication to be performed by the second radio terminal between the first communication and the second communication, on the basis of received quality of a downlink signal received in the second radio terminal from the radio base station when the first radio terminal performs the first communication. The first radio terminal relays user data, which is transferred through the second communication, between the second radio terminal and the radio base station when the first radio terminal performs the first communication and the second radio terminal performs the second communication.

Abstract: A base station according to a first feature uses a plurality of carriers for radio communications. The base station includes: a receiver that receives neighbor base station information on user terminals connected to a neighbor base station, wherein the neighbor base station information is transmitted from the neighbor base station; and a controller that changes a carrier configuration of at least one carrier among the plurality of carriers based on the neighbor base station information.

Abstract: An LTE base station 10-1 reserves uplink resource blocks for urgent communications and downlink resource blocks for urgent communications, when ETWS information is transmitted from a core network 30 to mobile terminals 40. The LTE base station 10-1 releases the uplink resource blocks for urgent communications and the downlink resource blocks for urgent communications when a predetermined time elapsed from the reservation of them and when an amount of calls between the LTE base station 10-1 and the mobile terminals 40 is at or below a fourth predetermined value.

Abstract: A wireless communication system equipped with a base station, and at least one of wireless communication terminals which perform packet communication with respect to the base station by using at least one carrier, and wireless communication terminals which perform packet communications with respect to the base station by using a plurality of carriers at the same time.

Abstract: A communication control method applicable to a mobile communication system provided with a first gateway device, which manages a home base station, on a first communication path between a core network device and the home base station, comprises: an establishment step of establishing, between the core network device and the home base station, a second communication path without passing through the first gateway device and passing through a second gateway device, in the case of switching to the second gateway device for managing the home base station in place of the first gateway device.

Abstract: A radio communication system comprises: a radio base station, a terminal device, and a plurality of relay devices that relay radio communication between the radio base station and the terminal device. The plurality of relay devices create communication quality information in radio communication between the relay devices and the radio base station. The terminal device preferentially connects to the relay device having the best communication quality based on each of the communication quality information.

Abstract: A method includes the steps of calculating a transmission power difference between a first carrier and a second carrier, and determining whether or not the transmission power difference exceeds a threshold set up on the basis of a maximum transmission power difference allowable between the first carrier and the second carrier. When the transmission power difference exceeds the threshold set up on the basis of the maximum transmission power difference, the transmission power of the first carrier or the second carrier is controlled while maintaining the transmission power difference within the maximum transmission power difference and not complying with power control information corresponding to the first carrier or the second carrier.

Abstract: A base station is provided with an assignment unit 37 for assigning an access terminal identifier to an access terminal 21 of the base station, a memory unit for storing information to permit transition into a semi connected state where the access terminal 21 saves power, while the access terminal 21 holds the access terminal identifier, and a change unit, in a case where an access terminal among the access terminals 21 having the access terminal identifiers assigned thereto is using an application for which transition into the semi connected state is effective and an access terminal identifier assigned to the access terminal 21 is not permitted to transit into the semi connected state, for changing the access terminal identifier assigned to the access terminal 21 to an access terminal identifier permitted to transit into the semi connected state based on the information stored by the memory unit 46.

Abstract: If an LTE base station (10-1) transmits an Earthquake and Tsunami Warning System (ETWS) signal from a core network (30) to mobile terminals (40), the LTE base station (10-1) determines that conditions are satisfied in which the traffic volume between the mobile terminals (40) is predicted to be at least a first predetermined value, adjusts the real amount of available wireless resources, and obtains an amount of available wireless resources after said adjustment. Additionally, the LTE base station (10-1) transmits a resource status response message, including the amount of available wireless resources after adjustment, to an adjacent LTE base station (10-2).

Abstract: An LTE base station 10-1 reserves uplink resource blocks for urgent communications and downlink resource blocks for urgent communications, when ETWS information is transmitted from a core network 30 to mobile terminals 40. The LTE base station 10-1 releases the uplink resource blocks for urgent communications and the downlink resource blocks for urgent communications when a predetermined time elapsed from the reservation of them and when an amount of calls between the LTE base station 10-1 and the mobile terminals 40 is at or below a fourth predetermined value.

Abstract: A wireless communication system equipped with a base station, and at least one of wireless communication terminals which perform packet communication with respect to the base station by using at least one carrier, and wireless communication terminals which perform packet communications with respect to the base station by using a plurality of carriers at the same time.

Abstract: The present invention is summarized as a radio communication method including the steps of calculating a transmission power difference between a transmission power value of a first carrier and a transmission power value of a second carrier; determining whether or not the transmission power difference exceeds a threshold which indicates a maximum transmission power difference allowable between the first carrier and the second carrier; and decreasing a data rate for transmission via one of the first carrier and the second carrier that has the higher transmission power value when the transmission power difference exceeds the maximum transmission power difference.

Abstract: A radio communication method includes the steps of: calculating a transmission power difference between a first carrier and a second carrier; determining whether or not the transmission power difference exceeds a threshold set up on the basis of a maximum transmission power difference allowable between the first carrier and the second carrier; and stopping transmission of power control information being an instruction to increase transmission power of the carrier having higher transmission power out of the first carrier and the second carrier when the transmission power difference exceeds the threshold set up on the basis of the maximum transmission power difference.

Abstract: A base station 20 monitors change of a parameter for an adaptive array antenna, the parameter being used to control a directivity of a beam to be transmitted to a mobile terminal device 30. As a result, when detecting that a value indicating the change has fallen below a predetermined value, the base station 20 suppresses control of the directivity of a transmission signal. Moreover, the base station 20 transmits decrease information to the mobile terminal device 30, the decrease information indicating that the value indicating the change has fallen below the predetermined value. Upon receipt of the decrease information transmitted from the base station 20, the mobile terminal device 30 equalizes a signal to be transmitted to the base station 20 on the basis of a delay status of a reception signal received from the base station 20, and then transmits the equalized signal to the base station 20.

Abstract: A base station 100 included in a first radio communication system includes: a monitor instruction unit 130 configured to instruct a mobile station 10 to monitor a reception power of an interference signal transmitted using a frequency assigned to a second radio communication system (frequency b) when the radio communication with the mobile station 10 performed using a frequency a is interrupted; and a handoff instruction unit 140 configured to instruct the mobile station 10 to switch the frequency used in the radio communication to a frequency e not interfered with by the interference signal, in accordance with the reception power monitored by the mobile station 10.

Abstract: In a CDMA wireless communication system equipped with a base station, and at least one of wireless communication terminals which performs packet communications with respect to the base station by using at least one carrier, and wireless communication terminals which performs packet communications with respect to the base station by using a plurality of carriers at the same time.

Abstract: A base station 20 monitors change of a parameter for an adaptive array antenna, the parameter being used to control a directivity of a beam to be transmitted to a mobile terminal device 30. As a result, when detecting that a value indicating the change has fallen below a predetermined value, the base station 20 suppresses control of the directivity of a transmission signal. Moreover, the base station 20 transmits decrease information to the mobile terminal device 30, the decrease information indicating that the value indicating the change has fallen below the predetermined value. Upon receipt of the decrease information transmitted from the base station 20, the mobile terminal device 30 equalizes a signal to be transmitted to the base station 20 on the basis of a delay status of a reception signal received from the base station 20, and then transmits the equalized signal to the base station 20.

Abstract: A base station 100 included in a first radio communication system includes: a monitor instruction unit 130 configured to instruct a mobile station 10 to monitor a reception power of an interference signal transmitted using a frequency assigned to a second radio communication system (frequency b) when the radio communication with the mobile station 10 performed using a frequency a is interrupted; and a handoff instruction unit 140 configured to instruct the mobile station 10 to switch the frequency used in the radio communication to a frequency e not interfered with by the interference signal, in accordance with the reception power monitored by the mobile station 10.

Abstract: A base station is provided with an assignment unit 37 for assigning an access terminal identifier to an access terminal 21 of the base station, a memory unit for storing information to permit transition into a semi connected state where the access terminal 21 saves power, while the access terminal 21 holds the access terminal identifier, and a change unit, in a case where an access terminal among the access terminals 21 having the access terminal identifiers assigned thereto is using an application for which transition into the semi connected state is effective and an access terminal identifier assigned to the access terminal 21 is not permitted to transit into the semi connected state, for changing the access terminal identifier assigned to the access terminal 21 to an access terminal identifier permitted to transit into the semi connected state based on the information stored by the memory unit 46.