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.


Time filter

Source Type

A mobile station UE includes a measurement unit 102 configured to measure radio quality of a cell during communication or a neighboring cell for each of the two or more carriers, a determination unit 104 configured to determine whether to notify the radio base station eNB of a measurement result regarding each of the two or more carriers in the measurement unit 102, and a transmission unit 106 configured to transmit the measurement result in the measurement unit 102 to the radio base station eNB, wherein the transmission unit 106 transmits, in addition to the measurement result regarding a carrier in which it is determined by the determination unit 104 to notify the radio base station eNB of the measurement result in the measurement unit 102, a measurement result regarding a carrier other than the carrier.


Patent
NTT DoCoMo | Date: 2017-01-18

In image predictive encoding according to an embodiment, one or more motion information sets are derived from plural pieces of motion information stored in a computer readable storage medium. Each of the one or more information sets includes two pieces of motion information between which any one of constituent elements differ in value. A predicted signal of a target region in a picture is generated by motion compensation, using two pieces of motion information in a motion information set selected from the one or more motion information sets. The two pieces of motion information in the selected motion information set are stored in the computer readable storage medium, and are used for generation of a predicted signal of another region.


A radio communication system includes one or more user terminals and one or more base stations that execute time division radio communication using a time division duplex (TDD) system. A radio frame is a radio communication resource used in the time division radio communication, and includes a downlink subframe that is a transmission period of a downlink signal, a special subframe including a guard period that is used neither for transmission of a downlink signal nor for transmission of an uplink signal, and an extended subframe that is used as either a transmission period of a downlink signal or a transmission period of an uplink signal, in accordance with a scheduling by the base station.


In a cellular telecommunications network, a mobile communication system to offload data traffic from base stations to small-node devices, includes a radio base station, a plurality of small-node devices, a macro-base-station-to-the-small-node-device (BS2D) communication section configured to receive a first control-plane message from the radio base station over a BS2D communication link, a small-node-device-to-user-equipment (D2UE) communication section configured to transmit user-plane data to a user equipment over a wireless D2UE communication link established responsive to the first control-plane message, and a center small-node device. The center small-node device includes a buffer section, a backhaul communication section configured to receive the user-plane traffic data from a server over a backhaul link, and is configured to manage D2UE connections between the plurality of small-node devices and the mobile station, buffer data to be transmitted in downlink and uplink for the plurality of small-node devices, and conduct a link adaptation for the D2UE connections.


A radio communication method for a radio base station, apparatus that controls transmission of an aperiodic SRS (Sounding Reference Signal) by a mobile terminal apparatus is described. The radio communication method includes selecting a specific bit information piece to report to the mobile terminal apparatus, from a table having four bit in formation pieces including one bit information piece to indicate not to trigger the aperiodic SRS and three bit information pieces to indicate to transmit the aperiodic SRS using first to third default SRS parameters respectively, the four bit information pieces all being defined in a 2-bit bit field in downlink control information to be transmitted in one subframe, and transmitting, to the mobile terminal apparatus; the first to third default SRS parameters by higher layers and the specific bit information piece by a downlink control channel.


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.

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