Kyocera Corporation

Kugo Morita

Masato Fujishiro

Chiharu Yamazaki

Yushi Nagasaka

Noriyoshi Fukuta

Hiroyuki Adachi

Henry S Chang

Fangwei Tong

Naohisa Matsumoto

Hiroyuki Urabayashi

Takahiro Saiwai

Katsuhiro Mitsui

Susumu Kashiwase

Atsuhisa Inakoshi

Chizuko Nagasawa

Makoto Chishima

Mayumi Komura

Amit Kalhan

Akinori Iwabuchi

Shingo Katagiri

Tohru Sunaga

Katsuhiko Shimizu

Michiaki Hiraoka

Masatoshi Tano

Donald R Timms

A user equipment comprising a receiver configured to receive a radio resource control (RRC) Release message from a serving cell, wherein the RRC Release message includes an indication causing the user equipment to transition from an RRC connected state to a specific state, the specific state being a state in which a RRC connection is suspended for the user equipment, and a controller. The controller is configured to cause the user equipment to transition from the RRC connected state to the specific state in response to receiving the RRC Release message, perform a cell reselection operation when the user equipment is in the specific state, and perform, when the user equipment in the specific state, an operation of causing the user equipment to transition from the specific state to an RRC idle state in response to reselecting a predetermined cell.

Base station and radio terminal for performing radio access network paging

Configurations of a user equipment and an apparatus provided in a user equipment, and a method used in a user equipment, receive from a base station, for each bandwidth part of a plurality of bandwidth parts provided in a bandwidth of one carrier, information indicating a frequency location of the bandwidth part and information indicating a subcarrier spacing applied to the corresponding bandwidth part, receive from the base station, information indicating a use condition of a predetermined bandwidth part included in the plurality of bandwidth parts. In response to determining that the use condition is satisfied, the configurations and method use the predetermined bandwidth part.

Radio terminal

A user equipment, apparatus for controlling user equipment, and method performed by user equipment includes receiving a radio resource control (RRC) Release message from a base station included in a radio access network (RAN). The RRC Release message includes an indication causing the user equipment to transition from an RRC connected state to a specific state, the specific state being a state in which a RRC connection is suspended for the user equipment. The user equipment is caused to transition from the RRC connected state to the specific state in response to receiving the RRC Release message, perform a cell reselection operation when the user equipment is in the specific state, and perform, when the user equipment in the specific state, an operation of causing the user equipment to transition from the specific state to an RRC idle state in response to reselecting a cell not supporting the specific state.

A user equipment, method, and chipset receive from a base station resource information indicating usable radio resources for data transmitted in the direct communication, detect a power when receiving a radio signal directly transmitted from another user terminal, and determine, based on the result of the process, a radio resource used to transmit the data from among the usable radio resources indicated by the resource information.

Mobile communication system, user terminal, and base station

A user equipment, method used in a user equipment, and an apparatus for a user equipment include receiving from a first cell operated in a licensed band, configuration information configuring a second cell operated in an unlicensed band, performing a listen-before-talk (LBT) procedure on the second cell, counting a number of failures of the LBT procedure on the second cell, and transmitting information based on the number of failures of the LBT procedure on the second cell, to the first cell operated in the licensed band, the information indicating the failure of the LBT procedure on the second cell.

User terminal and base station

A mobile communication system according to one embodiment comprises: a base station configured to transmit discovery reference signal in an unlicensed spectrum, and a radio terminal configured to receive the discovery reference signal in the unlicensed spectrum. The base station notifies the radio terminal of timing information indicating a timing at which the discovery reference signal is to be transmitted in the unlicensed spectrum.

Mobile communication system

A user equipment and apparatus receive from a base station, configuration information configuring the user equipment to provide assistance information indicating a preference of the user equipment to leave RRC connected state, and transmit to the base station, assistance information indicating that a preferred RRC state of the user equipment is an RRC state in which an RRC connection is suspended. A base station transmits to a user equipment, configuration information configuring the user equipment to provide assistance information indicating a preference of the user equipment to leave RRC connected state, and receives from the user equipment, assistance information indicating that a preferred RRC state of the user equipment is an RRC state in which an RRC connection is suspended.

A user equipment, apparatus, and method receives from a base station, for each bandwidth part of a plurality of bandwidth parts provided in a bandwidth of one carrier, information indicating a frequency location of the bandwidth part and information indicating a subcarrier spacing applied to the corresponding bandwidth part, and receives, from the base station, broadcast information including information on a special bandwidth part which the user equipment should use initially. A base station transmits to a user equipment, for each bandwidth part of a plurality of bandwidth parts provided in a bandwidth of one carrier, information indicating a frequency location of the bandwidth part and information indicating a subcarrier spacing applied to the corresponding bandwidth part, and transmits to the user equipment, broadcast information including information on a special bandwidth part which the user equipment should use initially.

A user equipment, method used in user equipment, and apparatus for controlling a user equipment operate to receiving a connected mode DRX parameter configured by a base station, and transmit to the base station a message including information indicating a connected mode DRX parameter preferred by the user equipment. The connected mode DRX parameter preferred by the user equipment includes at least one of DRX-InactivityTimer, DRX-ShortCycle, and DRX-ShortCycleTimer.

Communication method, radio terminal, and processor

A radio terminal receives multicast data belonging to an MBMS service from a base station. The radio terminal includes a receiver configured to receive configuration information indicating one or more common resource pools shared by a plurality of radio terminals to transmit feedback information corresponding to the multicast data to the base station, the configuration information including information indicating a correspondence relationship between an attribute of the feedback information and a common resource pool and/or a signal sequence; a controller configured to select a specific common resource pool used for transmission of the feedback information and/or a specific signal sequence used for transmission of the feedback information, based on the attribute of the feedback information to be transmitted to the base station and the correspondence relationship; and a transmitter configured to transmit the feedback information to the base station using the specific common resource pool and/or the specific signal sequence.

Enhancing utilization efficiency of radio resources in MBMS

User equipment, apparatus and method perform dual connectivity with a first base station acting as a master base station and a second base station acting as a secondary base station, transmit to the master base station capability information indicating that the user equipment supports a function of skipping a random access procedure, and receive from the master base station, a message instructing to change the secondary base station from the second base station to a third base station. The message includes information indicating that random access procedure for the third base station is skipped and an including an uplink grant indicating radio resources allocated by the third base station and a timing advance (TA) value to be applied to an uplink transmission to the third base station. The user equipment transmits the uplink transmission to the third base station by using the uplink radio resources indicated by the uplink grant.

Radio terminal and base station capable of handover without performing RACH handover

A radio terminal according to one embodiment comprises: a controller configured to detect a radio problem in communication with a base station in an RRC connected state and attempt a recovery from the radio problem; and a transmitter configured to transmit, to the base station, a polling signal for confirming whether or not the base station considers an RRC state of the radio terminal as the RRC connected state in response to the successful recovery. The controller maintains the RRC connected state in response to reception, from the base station, of a response signal to the polling signal.

Radio terminal and base station

A user terminal, method used in a user terminal, and an apparatus for a user terminal include receiving from a base station measurement configuration information configuring measurement of a frequency channel in an unlicensed band, measuring signal strength of radio signals transmitted in the frequency channel, determining occupancy situation of the frequency channel based on the measured signal strength and a threshold, and transmitting to the base station a measurement report including information indicating the occupancy situation of the frequency channel.

A user equipment, method, and chipset receive system information block (SIB) broadcasted from a base station, and while the user equipment is in a radio resource control (RRC) idle mode in which no RRC connection is established between the use equipment and the base station, the SIB is used to control the D2D communication. Data is transmitted to other user equipment by the D2D communication based on the SIB while the user equipment is in the RRC idle mode. The SIB includes resource information indicating usable radio resources for the D2D communication and power information used for controlling transmission power in the D2D communication. The transmitting comprises determinations of radio resources used to transmit the data based on the resource information and transmission power used in transmitting the data based on the power information, and transmitting the data using the determined radio resources and the determined transmission power.

In a first user equipment, apparatus and method, a first user equipment performs sidelink communication with a second user equipment, receives a first message from the second user equipment, where the first message is periodically transmitted from the second user equipment based on a first timer, starts or restarts a second timer upon receiving the first message, where a value of the second timer is determined based on a value of the first timer, and transmits a second message to a network apparatus upon expiration of the second timer, where the second message indicates that the second user equipment is disconnected from the first user equipment.

Growing community of inventors

Yokohama, Japan

Kugo Morita