Ntt Docomo, Inc.

Yuta Sagae

Hideaki Takahashi

Tooru Uchino

Kazuaki Takeda

Hitoshi Yoshino

Satoshi Nagata

Anil Umesh

Sadayuki Abeta

Hiromasa Umeda

Daisuke Nishikawa

Kohei Kiyoshima

Hiroyuki Ishii

Wuri Andarmawanti Hapsari

Yousuke Sano

Yusuke Ohwatari

Yoshihisa Kishiyama

Kengo Yagyu

Yukihiko Okumura

Akihito Hanaki

Tetsushi Abe

Yoshiaki Ofuji

Masahiro Fujii

Naoto Ookubo

Tatsuro Yajima

Hiroshi Chin

Hidekazu Shimodaira

Takuto Arai

Takashi Kosugi

A FrontHaul Multiplexer (FHM) for relaying communications between a signal processing device and a plurality of radio devices includes a storage unit that stores a table in which device identification information of each of the plurality of radio devices is associated with beam identification information assigned to the radio device; a scheduling information reception unit that receives, from the signal processing device, scheduling information of a user terminal performing radio communications with the plurality of radio devices; a determination unit that acquires from the table the device identification information associated with the beam identification information of uplink included in the scheduling information and then determines from the acquired device identification information the radio device in charge of the user terminal; and a transmission unit that transmits to the signal processing device an uplink signal transmitted from the determined radio device.

Signal processing device, radio device, front haul multiplexer, beam control method, and signal combining method

An objective is to enable communications properly using an Scell even in a case where a radio base station which transmits 'Activate command' and a radio base station which manages an Scell are different when 'Inter-site CA' is performed. A radio base station eNB #according to the invention includes a transmission unitconfigured to transmit an &#x201c;Activate command&#x201d; which is a command to activate a cell #B to a mobile station UE and thereafter notify a radio base station eNB #that the cell #B is activated.

Radio base station and mobile station for performing communications by aggregating cells under different radio base stations

Based on an entering condition for reporting reception quality of a cell via Measurement Report, UE () transmits to a radio access network the Measurement Report. The UE () judges numberOfTriggeringCell that triggers transmission of the measurement report to the radio access network, and transmits the Measurement Report when the number of neighbor cells that fulfill the entering condition is equal to or more than the numberOfTriggeringCell.

User device and measurement report transmitting method

A user apparatus, in a radio communication system including a plurality of base stations, including a reception unit configured to receive, from a connecting base station, control information to be used for reducing an interference signal sent from an interference base station for the user apparatus; and an interference reducing unit configured to reduce the interference signal by using the control information to obtain a desired signal sent from the connecting base station.

User apparatus, base station, interference reducing method and interference reducing control information notification method

Techniques for assigning uplink dedicated resources in inter-site or inter-eNB carrier aggregation promptly are disclosed. One aspect of the present invention relates to a base station including a transmission and reception unit configured to use radio resources to communicate with a user equipment and a resource management unit configured to manage the radio resources, wherein the resource management unit comprises a pooling information storage unit configured to store pooling information indicative of radio resources reserved for the base station by a non-anchor base station in inter-eNB carrier aggregation, and the resource management unit autonomously assigns the radio resources indicated in the pooling information to the user equipment.

Base station and wireless communication method using carrier aggregation

There is provided user equipment of a radio communication system including a base station and the user equipment, the user equipment including a receiver that receives, from the base station, measurement band information indicating a frequency range in which received quality is measured in a system bandwidth; and a measurer that measures the received quality in the frequency range indicated by the measurement band information.

User equipment, base station, and measurement method

A mobile station UE according to the present invention includes: a managing unitconfigured to manage one or multiple TAGs each including any of a Pcell and an Scell; an adjusting unitconfigured to adjust the transmission timings of uplink signals in any of the Pcell and the Scell belonging to the same TAG such that the transmission timings will be the same; and a transmitting unitconfigured to notify a radio base station eNB of the supportable number of TAGs.

Mobile station for notifying timing adjustment capabilities

Some techniques for promptly assigning uplink dedicated resources in inter-site or inter-eNB carrier aggregation are disclosed. One aspect of the present invention relates to a user equipment including a transmission and reception unit configured to use radio resources to communicate with multiple base stations, a resource management unit configured to manage the radio resources and a cell type determination unit configured to determine a type of a cell providing the radio resources, wherein when the resource management unit detects occurrence of a release trigger for assigned uplink dedicated resources, the cell type determination unit determines a type of a cell providing the uplink dedicated resources and retains or releases the uplink dedicated resources depending on the determined cell type.

User equipment, base station and method

A user apparatus in a radio communication system including a plurality of base stations, including a reception unit that receives, from a connecting base station, control information to be used for reducing a signal of a control channel, that causes interference, sent from an interference base station for the user apparatus, and an interference reducing unit that reduces the signal of the control channel that causes the interference by using the control information to obtain a desired signal sent from the connecting base station.

One aspect of the present invention relates to a mobile station having a SAR backoff function including a SAR signaling receiving unit configured to receive a SAR signaling from a base station, the SAR signaling indicating that a SAR backoff is available, and a maximum transmit power determination unit configured to determine maximum transmit power of the mobile station depending on whether the SAR signaling receiving unit has received the SAR signaling, wherein in response to receiving the SAR signaling at the SAR signaling receiving unit, the maximum transmit power determination unit applies a power reduction factor associated with the SAR backoff to determine the maximum transmit power.

Mobile station and method for use in radio communication system

A user apparatus in a mobile communication system supporting carrier aggregation includes a measurement unit configured to measure an rs-sinr (reference signal-signal to interference and noise ratio) for a reference signal in a physical downlink control channel transmitted from a base station; and a reporting unit configured to report the measured rs-sinr to the base station in accordance with a predefined reporting trigger.

User equipment, band balancing controller and RS-SINR reporting method

To execute appropriate process when 'Time-Switched UL CA' is executed and even when transmission of uplink information using a plurality of CCs has been scheduled in a same TTI. A radio base station eNB according to the present invention includes a UL transmission processing unitconfigured to transmit uplink information at TTI#n+4 using a CC allocated over a PDCCH to the mobile station UE at TTI#n. The UL transmission processing unitis configured to transmit the uplink information at each of TTIs using only one CC, and when a plurality of CCs is allocated at TTI#n, the UL transmission processing unitis configured to select uplink information to be transmitted at TTI#n+4, based on a priority corresponding to the uplink information to be transmitted using each of the plurality of CCs allocated.

Mobile station for uplink carrier aggregation using component carriers

Appropriate CC-to-TAG mapping is configured when 'UL CA' is performed. A mobile station UE of the invention includes: a management unitconfigured to manage one or more TAGS; an adjustment unitconfigured to make adjustment to synchronize transmission timings of uplink signals within CCs which belong to the same TAG; and a transmission unitconfigured to notify a radio base station eNB of a combination of supported bands, supported CCs, and settable TAGS, and the bands and the CCs grouped in the TAGs included in the combination.

Mobile station for performing component carrier-to-timing advance group mapping

The present invention is designed to provide a radio communication system, a user terminal and a radio communication method that make it possible to monitor communication quality adequately even when a new radio resource structure is employed. A radio communication system is provided, which transmits downlink control information from a radio base station to a user terminal by using an enhanced downlink control channel that is frequency-division-multiplexed with a downlink shared data channel, and which also monitors downlink quality based on the received quality of downlink reference signals that are transmitted from the radio base station to the user terminal, and, in this radio communication system, the user terminal determines radio link failures by comparing the received quality of the downlink reference signals transmitted from the radio base station, against one or both of first criteria, which are constituted of two thresholds that correspond to predetermined block error rates of a downlink control channel, and second criteria, which are constituted of two thresholds that are different from the two thresholds of the first criteria.

Radio communication system, user terminal and radio communication method

'Inter-site CA' using CCs under different radio base stations eNB in an asynchronous state can be performed appropriately. A mobile station UE of the present invention comprises a transmission unitconfigured to transmit 'UE Capability Information' to a radio base station eNB, the &#x201c;UE Capability Information&#x201d; indicating whether the mobile station UE is capable of performing &#x201c;Inter-site CA&#x201d; using CCs under different radio base stations eNB in the asynchronous state.

Growing community of inventors

Tokyo, Japan

Yuta Sagae