公开(公告)号：US20210068192A1

公开(公告)日：2021-03-04

申请号：US17060423

申请日：2020-10-01

Applicant: NEC CORPORATION

Inventor： Hisashi FUTAKI ,  Sadafuku Hayashi

IPC: H04W76/27 ,  H04W36/00 ,  H04W36/36 ,  H04W68/02 ,  H04W72/04

Abstract: A radio terminal (2) controls state transitions of the radio terminal (2) among first to third RRC states. In addition, if the radio terminal (2) is in the second RRC state, if a current cell that the radio terminal (2) has camped on is different from a first cell in which a state transition from the first RRC state to the second RRC state was performed, and if the current cell satisfies a predetermined condition, the radio terminal (2) allows the radio terminal (2) to transmit data to be transmitted in the current cell by a first transmission procedure in which the radio terminal (2) transmits uplink data before entering the first RRC state.

公开(公告)号：US20200374052A1

公开(公告)日：2020-11-26

申请号：US16991656

申请日：2020-08-12

Applicant: NEC CORPORATION

Inventor： Hisashi FUTAKI ,  Sadafuku HAYASHI

IPC: H04L5/00 ,  H04W92/20 ,  H04W12/00 ,  H04W88/10 ,  H04L29/04 ,  H04W4/00 ,  H04W12/04 ,  H04W76/27 ,  H04W28/02 ,  H04W80/02

Abstract: A radio station (2) transmits configuration information (501) to a radio terminal (1). The configuration information (501) indicates, on a cell-by-cell basis, at least one specific cell on which the radio terminal (1) is allowed to perform at least one of data transmission and data reception on a radio bearer used for uplink transmission or downlink transmission or both via a common Packet Data Convergence Protocol (PDCP) layer (402). As a result, in a radio architecture that provides tight interworking of two different Radio Access Technologies (RATs), it is for example possible to allow an eNB to indicate, to a radio terminal (UE), a specific cell on which the UE should perform uplink transmission.

公开(公告)号：US20200351684A1

公开(公告)日：2020-11-05

申请号：US16932126

申请日：2020-07-17

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Hiroaki AMINAKA ,  Hiroto SUGAHARA ,  Yoshikazu KAKURA ,  Kazushi MURAOKA

IPC: H04W24/08 ,  H04W76/27 ,  H04B17/309 ,  H04B17/24 ,  H04B17/318 ,  H04B17/382 ,  H04W24/10 ,  H04W16/14 ,  H04W88/02 ,  H04W72/04 ,  H04W88/10 ,  H04L5/00 ,  H04W72/08

Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).

公开(公告)号：US20200296786A1

公开(公告)日：2020-09-17

申请号：US16845222

申请日：2020-04-10

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Hiroaki AMINAKA

IPC: H04W76/15 ,  H04B7/024 ,  H04L5/00 ,  H04W72/04

Abstract: A first radio station (1) requests or instructs a second radio station (2) to prepare for communication with a radio terminal (3) on a second cell (20) while a first radio connection on a first cell (10) with the radio terminal (3) is established. Further, the first radio station (1) instructs the radio terminal (3) or the second radio station (2) to establish a second radio connection on the second cell (20) with the radio terminal (3) while maintaining the radio connection on the first cell (10) with the radio terminal (3). It is thus for example possible to enable a single radio terminal to establish radio connections with cells of a plurality of radio stations, in order to achieve carrier aggregation of cells operated by different radio stations.

公开(公告)号：US20200267608A1

公开(公告)日：2020-08-20

申请号：US16800008

申请日：2020-02-25

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Sadafuku HAYASHI

IPC: H04W36/00 ,  H04W72/04 ,  H04W36/18 ,  H04W92/20 ,  H04W36/04 ,  H04W16/32

Abstract: A secondary base station (2) receives an SeNB addition request message (302) from a second master base station (3) while providing a radio terminal (4) with a secondary cell group (SCG) for DC in cooperation with a first master base station (1). If the SeNB addition request message (302) explicitly or implicitly indicates that a master base station in DC for the radio terminal (4) is to be changed from the first master base station (1) to the second master base station (3), the secondary base station (2) considers that the SeNB addition request message (302) requests modification of the SCG that has already been configured. It is thus, for example, possible to contribute to performing a procedure for changing a master base station in Dual Connectivity (DC) by using existing inter-base station interface procedures and inter-base station signaling messages.

公开(公告)号：US20200252830A1

公开(公告)日：2020-08-06

申请号：US16855327

申请日：2020-04-22

Applicant: NEC CORPORATION

Inventor： Hisashi FUTAKI

IPC: H04W28/06 ,  H04W72/04 ,  H04W72/12

Abstract: A radio station (3) is configured to perform, with at least one radio terminal (1, 2), first radio communication in accordance with a first transmission time interval (TTI) and second radio communication in accordance with a second TTI. The first TTI is equal to a duration of one subframe (410, 510). The second TTI is shorter than the duration of the subframe (410, 510). The radio station (3) is configured to receive assistance information (802, 904) regarding the second radio communication from the radio terminal (2) capable of performing the second radio communication or from a higher network node (4).

公开(公告)号：US20200169893A1

公开(公告)日：2020-05-28

申请号：US16776844

申请日：2020-01-30

Applicant: NEC Corporation

Inventor： Hiroaki AMINAKA ,  Hisashi FUTAKI

IPC: H04W16/14 ,  H04W72/04 ,  H04W76/15 ,  H04W76/12

Abstract: A first base station (1) is configured to establish a first signaling bearer with a mobility management apparatus (5), establish a second signaling bearer with a second base station (2), and to establish a signaling radio bearer with a mobile station (3) in a first cell (10). The second base station (2) is configured to establish the second signaling bearer with the first base station (1), establish a data bearer with a data transfer apparatus (6), and to establish a data radio bearer with the mobile station (3) in a second cell (20). Furthermore, the first base station (1) is configured to transmit, to the second base station (2) through the second signaling bearer configuration information, necessary to establish the data bearer and the data radio bearer in the second base station (2). Thus, for example, bearer architecture suitable for a C/U plane split scenario is provided.

公开(公告)号：US20200053520A1

公开(公告)日：2020-02-13

申请号：US16657407

申请日：2019-10-18

Applicant: NEC CORPORATION

Inventor： Hisashi FUTAKI ,  Sadafuku Hayashi

IPC: H04W4/14 ,  H04W88/10 ,  H04W76/20 ,  H04W48/18 ,  H04W88/06 ,  H04W76/27

Abstract: A radio terminal (1) is configured to transmit data using a first communication architecture type, in response to an occurrence of a request for specific data transmission when the radio terminal (1) has already been configured by a network (3) to use a second communication architecture type. This contributes to, for example, when the radio terminal has already been configured by the network to use the second communication architecture type that involves suspension and resumption of an RRC connection, facilitating effectively performing communication according to the first communication architecture type that involves data transmission over a control plane.

公开(公告)号：US20190387563A1

公开(公告)日：2019-12-19

申请号：US16506268

申请日：2019-07-09

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Hiroaki AMINAKA

IPC: H04W76/15 ,  H04B7/024 ,  H04L5/00 ,  H04W72/04

Abstract: A first radio station (1) requests or instructs a second radio station (2) to prepare for communication with a radio terminal (3) on a second cell (20) while a first radio connection on a first cell (10) with the radio terminal (3) is established. Further, the first radio station (1) instructs the radio terminal (3) or the second radio station (2) to establish a second radio connection on the second cell (20) with the radio terminal (3) while maintaining the radio connection on the first cell (10) with the radio terminal (3). It is thus for example possible to enable a single radio terminal to establish radio connections with cells of a plurality of radio stations, in order to achieve carrier aggregation of cells operated by different radio stations.

公开(公告)号：US20190357058A1

公开(公告)日：2019-11-21

申请号：US16525259

申请日：2019-07-29

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI

IPC: H04W16/26 ,  H04W72/04 ,  H04W68/00 ,  H04W4/70 ,  H04W8/22 ,  H04W24/04

Abstract: A base station (13) is configured to receive, from a Machine-to-machine (M2M) terminal (11) or a core network (14), history information indicating whether or not specific coverage enhancement processing was executed in previous communication with the M2M terminal (11). Further, the base station (13) is configured to control communication using the specific coverage enhancement processing between the M2M terminal (11) and the base station (13) based on the history information received from the M2M terminal (11) or the core network (14). It is thus possible to contribute to improving efficiency of determination regarding whether to apply a special coverage enhancement processing to the M2M terminal.