Abstract: A mobile communication method includes the steps of transmitting a first control signal including an identifier different from a C-RNTI to the mobile station UE#A through a PDCCH by a radio base station PhNB#10 managing a cell #10 formed by linking multiple small cells, transmitting a second control signal including an identifier to the mobile station UE through a PDCCH by a radio base station eNB#1 managing a cell #1 having a coverage area overlapping with a coverage area of the cell #10, and regarding the first control signal as valid by the mobile station UE#A, when it determines that the identifier included in the first control signal and the identifier included in the second control signal match each other.

Abstract: Even when a same C-RNTI is allocated to multiple mobile stations in a phantom cell, a collision between the mobile stations UE to which the same C-RNTI is allocated is avoided. A radio base station PhNB#10 according to the present invention is configured to manage a cell #10 (phantom cell) which is formed by linking multiple small cells and includes an allocation unit 11 configured to allocate a same C-RNTIph to multiple mobile stations UE#1/UE#3 which are separated by at least a predetermined distance in the cell #10.

Abstract: The present invention is designed to provide a radio communication terminal, a base station apparatus, a radio communication system and a radio communication method which can reduce the cost to be required for an MTC terminal when the LTE system is employed in the network domain of a machine communication system.

Abstract: The present invention is designed to detect an S-cell efficiently, in a short time, upon carrier aggregation in a HetNet. In a communication system where carrier aggregation is executed between a first carrier (CC #1) and a second carrier (CC #2), a macro base station apparatus (20A) generates a carrier detection signal that makes a mobile terminal apparatus (10) detect the second carrier (CC #2), such that carrier aggregation is executed with the first carrier (CC #1), and transmits the carrier detection signal to an RRH base station apparatus (20B) such that the carrier detection signal is transmitted from the RRH base station apparatus (20B) to the mobile terminal apparatus (10) in the second carrier (CC #2) in which the carrier detection signal can be allocated with a higher density than a reference signal of the first carrier (CC #1). The macro base station apparatus (20A) detects an S-cell based on the received quality of the carrier detection signal fed back from the mobile terminal apparatus (10).

Abstract: An object is to improve the throughput of a mobile station UE without affecting the coverage of a macrocell in a case where CA is introduced to a HetNet environment. A radio base station eNB according to the present invention is configured to determine whether or not to change the connection destination of a mobile station UE from a small cell #1 to a small cell #2 while the mobile station UE is performing CA by using the macrocell and the small cell #1, based on at least one of the congestion status in each of the small cell #1 and the small cell #2 and the communication quality in each of the small cell #1 and the small cell #2.

Abstract: An adequate transmission rate is guaranteed in a case where “Inter-node UP aggregation” is being performed. In a mobile station according to the present invention, each of MAC layer functions includes a cost management unit configured to manage a cost of an LCH involved in “Inter-node UP aggregation”, a priority management unit configured to manage a priority of the LCH, and a bearer management unit configured to allocate transmission resources to data for the LCH based on the priority and the cost of the LCH. The cost management unit is configured to update the cost of the LCH managed by the cost management unit itself, based on a PBR value informed by a network.

Abstract: Even when the same C-RNTI is assigned to multiple mobile stations in a phantom cell, collision of the mobile stations to the same C-RNTI is assigned is avoided with simple implementation. A mobile station includes: a reception unit configured to acquire C-RNTIs set for other mobile stations UE not via a radio base station; and a transmission unit configured to give the radio base station a predetermined report when there is a mobile station UE set to have the same C-RNTI #X as a C-RNTI #X set for itself.

Abstract: Achieved is “Inter-node UP aggregation”. A mobile station UE according to the invention includes a MAC layer function for a radio base station MeNB and a MAC layer function for a radio base station SeNB. Each of the MAC layer function for the radio base station MeNB and the MAC layer function for the radio base station SeNB is configured to determine whether or not MAC-PDU received via a physical layer function is addressed to a logical channel managed by the MAC layer function itself, based on whether or not a MAC-ID is added to a header of the MAC-PDU.

Abstract: A mobile communication system is provided that performs bi-directional communications between a mobile station and a wireless access network device. The mobile station includes a connection set-up signal reception timing calculation unit for calculating a reception timing of a connection set-up signal when a connection request signal is transmitted, and a connection set-up signal reception determination unit that determines, according to the reception timing, whether the connection set-up signal is received, and performs a signal reception operation based on the determination.

Abstract: A system and method to prevent collision between mobile stations to which the same C-RNTI is allocated in a simple implementation while avoiding a problem of C-RNTI depletion in a phantom cell is disclosed. A radio base station includes an allocation unit configured to allocate multiple C-RNTIs to each of mobile stations, and the allocation unit performs adjustment such that collision of search spaces to which PDCCH resources are allocated does not occur among the multiple mobile stations.

Abstract: A radio base station that includes an upper-layer information transmission unit configured to transmit a length of Cyclic Prefix (CP) used in neighboring cells and a Positioning Reference Signal (PRS) transmission unit configured to transmit the PRS generated based on the length of CP, in a subordinate cell included in the neighboring cells.

Abstract: Even when a same C-RNTI is allocated to multiple mobile stations in a phantom cell, a collision between the mobile stations UE to which the same C-RNTI is allocated is avoided. A radio base station PhNB#10 according to the present invention is configured to manage a cell #10 (phantom cell) which is formed by linking multiple small cells and includes an allocation unit 11 configured to allocate a same C-RNTIph to multiple mobile stations UE#1/UE#3 which are separated by at least a predetermined distance in the cell #10.

Abstract: A C-RNTIph in a phantom cell is allocated to a mobile station UE after the mobile station UE is identified. A mobile communication method according to the present invention includes the steps of: when a cell #10 formed by linking multiple small cells is established in a manner as to at least partially overlap a coverage area of a cell #1 under control of a radio base station eNB#1, notifying a mobile station UE#1 in communication in the cell #1 of a C-RNTIph in the cell #10 by the radio base station eNB#1 by sending “RRC connection reconfiguration”; and setting, by the mobile station UE#1, the C-RNTIph in the cell #10 in addition to a C-RNTImacro in the cell #1.

Abstract: A communication device includes a network side communication unit that receives emergency information from an information broadcasting node; and a UE side communication unit that communicates a communication signal with user equipment (UE) through a radio base station. The UE side communication unit broadcasts a Secondary Notification signal including the emergency information, subsequent to broadcasting a Primary Notification signal providing notice of broadcasting of the emergency information, and individually transmitting a command signal for transition of an RRC protocol state or switching to another cell to the UE. The transition of the RRC protocol state is from a state where reception of the emergency information is disabled to a state where reception of the emergency information is enabled, and the other cell is such that the UE can receive the Secondary Notification signal, irrespective of the RRC protocol state of the UE.

Abstract: A radio base station PhNB managing a phantom cell is enabled to uniquely indentify a mobile station UE in communication in the phantom cell. A mobile communication method according to the present invention includes starting, by the radio base station PhNB#10, a “Non-contention based RA procedure” or a “Contention based RA procedure” with a mobile station UE#1 in communication in a cell #10 under control of the radio base station PhNB#10; and notifying, by the mobile station UE#1, the radio base station PhNB#10 of a C-RNTImacro which is allocated in a cell #1 other than the cell #10.

Abstract: Even when a same C-RNTI is allocated to multiple mobile stations UE in a phantom cell, a collision between the mobile stations UE to which the same C-RNTI is allocated is avoided. A radio base station PhNB#10 according to the present invention includes an allocation unit 11 configured to allocate a same C-RNTIph to multiple mobile stations UE#1 to UE#3 in a cell #10 and a transmission unit 13 configured to notify the multiple mobile stations UE#1 to UE#3 of different locations of radio resources. The transmission unit 13 transmits control signals to the mobile stations UE#1 to UE#3 at the notified locations of the radio resources through a PDCCH using the same C-RNTIph.

Abstract: The present invention is designed to provide highly efficient small cell radio access. Local stations (20) transmit small cell-specific DISCOVERY SIGNALS, and a mobile terminal apparatus (10) receives MEASUREMENT CONFIGURATION, in which a DS reception control signal is contained, from a macro station (30). The mobile terminal apparatus (10) receives the DISCOVERY SIGNALS based on control information reported by the MEASUREMENT CONFIGURATION. The macro station (30) selects local stations whose CSI information is to be fed back, based on DISCOVERY SIGNAL MEASUREMENT reports, and reports RRC CONNECTION RECONFIGURATION, in which local station information for feeding back CSI information is contained, to the mobile terminal apparatus (10).

Abstract: A mobile communication method includes the steps of transmitting a first control signal including an identifier different from a C-RNTI to the mobile station UE#A through a PDCCH by a radio base station PhNB#10 managing a cell #10 formed by linking multiple small cells, transmitting a second control signal including an identifier to the mobile station UE through a PDCCH by a radio base station eNB#1 managing a cell #1 having a coverage area overlapping with a coverage area of the cell #10, and regarding the first control signal as valid by the mobile station UE#A, when it determines that the identifier included in the first control signal and the identifier included in the second control signal match each other.

Abstract: The present invention is designed to provide a base station apparatus, a radio communication terminal, a radio communication system and a radio communication method which can reduce the cost required for MTC terminals when an LTE system is employed in the network domain of a machine communication system. A base station apparatus communicates with a first communication terminal in a first frequency band and also communicates with a second communication terminal in a second frequency band of a narrower bandwidth than the first frequency band, and includes: an allocation control section that allocates an extended downlink control channel which is frequency-division-multiplexed with a downlink shared data channel, in a predetermined frequency region in the second frequency band; and a mapping section that maps a common control signal that is common between the second communication terminals at least, in a common search space of the extended downlink control channel.

Abstract: A system for supporting smooth mobility of a mobile terminal apparatus between a plurality of local areas that are arranged in a wide area is disclosed. The system includes a wide area base station apparatus that covers a wide area, a local area base station apparatus that covers a local area arranged in the wide area, and a mobile terminal apparatus that can communicate with the wide area base station apparatus and the local area base station apparatus, and is configured to scramble a data signal and a reference signal by a scrambling sequence that is common between a plurality of local areas in communication between the local area base station apparatus and the mobile terminal apparatus.