Kyocera Corporation

Masato Fujishiro

Henry S Chang

Kugo Morita

Chiharu Yamazaki

Yushi Nagasaka

Hiroyuki Adachi

Noriyoshi Fukuta

Fangwei Tong

Katsuhiro Mitsui

Hiroyuki Urabayashi

Takahiro Saiwai

Atsuhisa Inakoshi

Naohisa Matsumoto

Amit Kalhan

Susumu Kashiwase

Mayumi Komura

Akinori Iwabuchi

Nobuki Hiramatsu

Hiroshi Uchimura

Shingo Katagiri

Sunao Hashimoto

Yasuhiko Fukuoka

Toi Kanda

Yukiko Takaba

Hiroshi Yamasaki

Jun Kitakado

Takanori Ikuta

Shinji Isoyama

Takahiro Watanabe

Masamichi Yonehara

Tohru Sunaga

Shotaro Sugita

A handover control according to a first aspect is a method for performing conditional handover of user equipment from a source cell to which the user equipment is connected to a target cell. The handover control method comprises receiving, by the user equipment, from the source cell, an RRC message for handover, the RRC message including identifiers of a plurality of candidate cells being candidates for the target cell; and transmitting, by the user equipment, a report message including information related to a radio link failure detected in the source cell, to a cell to which the user equipment connects after the radio link failure. The report message includes the identifiers of all the candidate cells included in the RRC message.

Handover control method

A communication control method includes broadcasting, by a first relay node configured to manage a cell, relay node support information indicating that the cell supports the relay node, communicating, by the first relay node, a failure-related notification indicating that a failure has occurred in a backhaul link, and stopping, by the first relay node, the broadcasting of the relay node support information according to the communication of the failure-related notification.

Communication control method

After receiving a PCS RRC connection released notification from a source user equipment (UE) device, a base station notifies a peer UE device. Where the base station is the serving base station of the peer UE device, the base station sends a PCS RRC connection released notification peer message to the peer UE device. Where the base station is not the serving base station of the peer UE device, the base station sends a PCS RRC connection released notification base station message to the other base station that is serving the peer UE device and the other base station sends a notification peer message to the peer UE device. In some situations, the base station evaluates data to determine whether notification should be sent to the peer UE device. At least some of the data may be included in the notification received from the source UE device.

PC5 radio resource control (RRC) sidelink (SL) connection management with base station notification

A communication control method comprises transmitting, by a user equipment to a network node, first information indicating that the user equipment prefers one of a RRC idle mode and a RRC inactive mode when data to be transmitted to the network node is not to occur in near future; and in response to changing a preferred RRC mode from a RRC mode indicated by the first information to a RRC connected mode, transmitting, by the user equipment to the network node, second information indicating that the user equipment prefers to revert the first information to leave the RRC connected mode.

Communication control method and user equipment for transitioning between RRC modes

A handover control method for performing a conditional handover of a user equipment from a source cell to a target cell, the source cell to which the user equipment connects. The handover control method comprises transmitting, by a source base station which manages the source cell to the user equipment, a RRC message including a list of candidate cells which are candidates for the target cell and a handover condition specified for each of the candidate cells in the list; and starting, by the source base station, transfer of a copy of downlink data of the user equipment to a candidate base station which manages the candidate cell in the list before the user equipment performs the handover.

Handover control method, and user apparatus

A communication control method according to an embodiment is a method used in a mobile communication system for providing a multicast broadcast service (MBS) from a base station to a user equipment. The communication control method includes transmitting, by the base station to the user equipment, switching information for switching a delivery mode between a first mode in which an MBS configuration is provided through dedicated signaling and a second mode in which the MBS configuration is provided through broadcast signaling; and performing, by the user equipment having received the switching information, mode switching between the first mode and the second mode based on the switching information.

Communication control method and user equipment

A network identifier for identifying a non-public cellular network allowed to be accessed from a user equipment and frequency information indicating a frequency of the non-public cellular network are stored in a SIM. The user equipment performs search processing for the non-public cellular network in accordance with the network identifier and the frequency information stored in the SIM.

Communication control method for communicating with public and non-public cellular networks

A peer user equipment (UE) device maintains an existing Sidelink Radio Bearer (SLRB) configuration to support a first PC5 Radio Resource Control (RRC) sidelink (SL) communication link with a source UE device. The peer UE device receives a request to establish a second PC5 RRC SL communication link with the source UE device and determines that the existing SLRB configuration is required to support the second PC5 RRC SL communication link. The peer UE device releases the first PC5 RRC SL communication link.

PC5 radio resource control (RRC) sidelink (SL) connection management

A communication control method is used in a user equipment in a cell operated in an unlicensed band. The communication control method comprises performing, by the user equipment, Listen Before Talk (LBT) before preforming transmission in the cell; determining, by the user equipment, whether the number of the LBT failure reaches a threshold; and when determining that the number of the LBT failure reaches the threshold, performing, by the user equipment, transmission in another cell in which the number of the LBT failure does not reach the threshold.

A first user equipment (UE) device manages the cast type for transmissions to other UE devices within a group during handovers. At least two cast types can be used from a set of cast types that comprises groupcast and unicast although other cast types may be included.

Cast type transmission management during handovers for sidelink communication

A user equipment includes a transmitter configured to transmit, to a network, information indicating desired operation related to a secondary cell. The desired operation includes any one of first operation of activating the secondary cell configured for the user equipment, second operation of deactivating the secondary cell configured for the user equipment, and third operation of configuring the secondary cell for the user equipment.

Method and user equipment

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

A mobile wireless communication user equipment device (mobile device) simultaneously stores logs for two minimization drive tests (MDTs) where a first MDT is associated with a first radio access technology (RAT) and a second MDT is associated with a second RAT. The mobile device logs MDT data for both MDTs to generate two MDT logs. In response to a request, the mobile device transmits a requested MDT log where the MDT log may be transmitted to a base station of a RAT different from the RAT of the MDT log.

Minimization drive test for wireless devices with multiple radio access technologies (RATs)

User equipment according to an aspect performs cell reselection of selecting a serving cell by ranking a plurality of cells based on radio quality. Based further on whether a cell is a non-terrestrial cell, the non-terrestrial cell being formed by a radio transceiver of a satellite or an aircraft, the user equipment determines a rank of the cell in the cell reselection.

A communication control method according to an embodiment is a method in a mobile communication system in which a data transfer path via at least one of relay apparatuses is configured between a donor base station and a user equipment. In the communication method, a relay apparatus is configured to activate a timer when establishment of a radio connection with an upper apparatus or activation of a relay function of the relay apparatus is rejected by the upper apparatus, or when the radio connection is released by the upper apparatus. The upper apparatus is another relay apparatus under the donor base station or the donor base station. The timer is configured to define time during which establishment of a radio connection with the upper apparatus or notification indicating an intention of activating the relay function to the upper apparatus needs to be avoided.

Growing community of inventors

Yokohama, Japan

Masato Fujishiro