Tokyo, Japan
Tokyo, Japan

NTT DOCOMO, Inc. is the predominant mobile phone operator in Japan. The name is officially an abbreviation of the phrase, "do communications over the mobile network", and is also from a compound word dokomo, meaning "everywhere" in Japanese. Docomo provides phone, video phone , i-mode , and mail services. The company has its headquarters in the Sanno Park Tower, Nagatachō, Chiyoda, Tokyo.Docomo was spun off from Nippon Telegraph and Telephone in August 1991 to take over the mobile cellular operations. It provides 2G PDC cellular services on the 800 MHz band, and 3G FOMA W-CDMA services on the 2 GHz and 800 MHz ) and 1700 MHz ) bands, and 4G LTE services. Its businesses also included PHS , paging, and satellite. Docomo ceased offering a PHS service on January 7, 2008. Wikipedia.

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The present invention is designed to adequately allocate power to PRACHs in dual connectivity. A user terminal communicates by using a first cell group (CG) and a second CG, and has a power control section that controls UL transmission power for the first CG and the second CG, and a transmission section that transmits at least a physical random access channel (PRACH), and, when the transmission section retransmits the PRACH in a primary cell of the first CG, the power control section applies control so that power is preferentially allocated to the retransmission of the PRACH over transmission in the second CG.


Patent
NTT DoCoMo | Date: 2017-05-17

The present invention is designed to adequately allocate power to the PRACH in dual connectivity. A user terminal communicates with a plurality of cell groups, each cell group being comprised of one or more cells that use different frequencies, and this user terminal has a transmission section that transmits a physical random access channel (PRACH) in a random access procedure, and a power control section that executes power control for transmitting the PRACH, and when the transmission power required for the PRACH to transmit to a master base station exceeds a threshold, the power control section executes control to stop uplink transmission to a secondary base station.


In order to prevent, in an LAA system supporting LBT, reduction in resource usage of the system, the present invention provides a radio base station that communicates with a user terminal capable of using a licensed band and unlicensed band. The radio base station comprises: an obtaining section that obtains information about an available time resource amount that is determined based on a result of LBT (Listen Before Talk) in the unlicensed band; and a control section that controls communication with the user terminal in the unlicensed band based on the information about the available time resource amount.


A Controller includes: a creation instruction reception unit that receives a creation instruction to create a target node; a configuration information acquisition unit that transmits identification information of the target node included in the creation instruction to a CookBook and receives target node configuration information including identification information and a scenario of a plurality of functional blocks (FBs) as a response based on the transmission; an arrangement instruction unit that transmits an arrangement instruction to arrange the plurality of FBs in combination, including the identification information of the plurality of FBs included in target node configuration information, to a Repository that stores FBs or a Platform in which the target node is arranged; and a setting instruction unit that transmits a setting instruction to set a scenario included in the target node configuration information to the plurality of FBs arranged based on the arrangement instruction.


The present invention is designed to reduce the decrease of system throughput in a radio communication system to use dual connectivity. According to one aspect of the present invention, a user terminal communicates with a plurality of radio base stations that each configure a cell group comprised of one or more cells, and this user terminal has a transmission section that transmits UL signals in each cell group, and a control section that controls the transmission power of UL signals, and the control section controls the total power of the transmission power of a first PRACH for a master base station and the transmission power of a second PRACH for a secondary base station, which are transmitted at the same time from the transmission section, to be equal to or lower than the maximum possible transmission power, by lowering the transmission power of the second PRACH.


A mobile station which communicates with a base station using an unlicensed band includes a resource management unit configured to manage information about an uplink transmission resource allocated by the base station; a transmission detection unit configured to detect whether transmission in the unlicensed band is possible before arrival of the allocated uplink transmission resource; and a transmission unit configured to transmit an uplink signal on the allocated uplink transmission resource, when transmission in the unlicensed band is possible.


The present invention is designed so that LBT (Listen Before Talk) is performed adequately in a radio communication system (LAA) to run LTE in an unlicensed band. A radio base station to communicate with a user terminal that is capable of using a licensed band and an unlicensed band has a control section that controls the transmission of downlink signals in the unlicensed band using LBT, a selection section that selects the symbol to execute LBT, randomly, with equal probability, from a plurality of candidate symbols, and an acquiring section that acquires a measurement result, in which the received signal intensity in the LBT period is measured, wherein, when the control section judges that the channel of the unlicensed band is in an idle state from the measurement result of received signal intensity, the control section executes control so that a beacon reference signal is transmitted in all of the candidate symbols that follow the symbol in which LBT was executed.


A locking control device, a locking control system, and a locking control method that can securely perform locking control, reissue an object or information for locking and unlocking when the object or information is lost, and reduce a maintenance cost of a line contract are provided. In a coin-operated locker 10, a short-range wireless communication unit 11 receives UIM information, which is information for connection to a mobile communication network, from a wearable device 20 by short-range wireless communication. A server communication unit 12 communicates with an authentication server 30 that holds authentication-relevant information by mobile communication using the UIM information. The server communication unit 12 receives authentication information from the authentication server 30. An authentication unit 15 performs authentication using the authentication information received from the authentication server 30 and a locking control unit 16 performs locking control on the basis of the authentication result from the authentication unit 15.


Patent
NTT DoCoMo | Date: 2017-01-25

Techniques for transmitting uplink data in dual connectivity efficiently are disclosed. One aspect of the present invention relates to user equipment having a dual connectivity function to communicate with multiple base stations simultaneously, comprising: a transmission buffer configured to store uplink data for transmission; a buffer status management unit configured to manage a data amount stored in the transmission buffer; and a transmission control unit configured to receive splitting trigger information indicative of a threshold for the data amount stored in the transmission buffer and a first base station to transmit the uplink data stored in the transmission buffer when the stored data amount is smaller than or equal to the threshold and select a base station to transmit the uplink data stored in the transmission buffer from the multiple base stations depending on whether the data amount stored in the transmission buffer is smaller than or equal to the threshold.


Patent
NTT DoCoMo | Date: 2017-03-15

A user apparatus in a communication system including a first base station and a second base station that perform communication with the user apparatus by inter-base station carrier aggregation, including: a maximum transmission power holding unit configured to hold a maximum transmission power that is configured beforehand for the first base station; a transmission power determination unit configured to determine whether a transmission power that is used by the user apparatus for performing signal transmission to the first base station reaches the maximum transmission power held by the maximum transmission power holding unit; and a transmission control unit configured, when it is determined that the transmission power reaches the maximum transmission power by the transmission power determination unit, to stop signal transmission to the second base station.

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