公开(公告)号：US12120767B2

公开(公告)日：2024-10-15

申请号：US17854698

申请日：2022-06-30

申请人： NEC Corporation

发明人： Hisashi Futaki ,  Sadafuku Hayashi

IPC分类号： H04W76/27 ,  H04W36/00 ,  H04W36/36 ,  H04W68/02 ,  H04W72/51

CPC分类号： H04W76/27 ,  H04W36/0016 ,  H04W36/0072 ,  H04W36/36 ,  H04W68/02 ,  H04W72/51

摘要： 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：US12114182B2

公开(公告)日：2024-10-08

申请号：US17829763

申请日：2022-06-01

申请人： NEC Corporation

发明人： Hisashi Futaki

IPC分类号： H04W24/02 ,  H04W28/04 ,  H04W28/06 ,  H04W48/08 ,  H04W74/0833

CPC分类号： H04W24/02 ,  H04W28/04 ,  H04W28/06 ,  H04W48/08 ,  H04W74/0833

摘要： A radio terminal (1) receives from a base station (2) a first value (601) of a first radio resource configuration information element. The first value (601) is associated with normal coverage or with a first coverage enhancement level. The radio terminal (1) derives a second value (604) of the first radio resource configuration information element by converting (603) the first value (601) using a value of a conversion factor (602). The second value (604) is associated with a second coverage enhancement level. It is thus, for example, possible to contribute to reduction of data size necessary for the base station to notify the radio terminal of a plurality of radio resource configurations for a plurality of coverage enhancement levels.

公开(公告)号：US12004018B2

公开(公告)日：2024-06-04

申请号：US17578664

申请日：2022-01-19

申请人： NEC Corporation

发明人： Hisashi Futaki ,  Hiroaki Aminaka

IPC分类号： H04W36/00 ,  H04W36/08 ,  H04W36/28 ,  H04W76/20 ,  H04W76/28 ,  H04B7/022 ,  H04W36/02 ,  H04W76/15

CPC分类号： H04W36/0016 ,  H04W36/0033 ,  H04W36/0069 ,  H04W36/08 ,  H04W36/28 ,  H04W76/20 ,  H04W76/28 ,  H04B7/022 ,  H04W36/023 ,  H04W76/15 ,  Y02D30/70

摘要： A radio network (6) and a radio terminal (4) are configured to, when the radio terminal (4) is using a first cell (10) served by a first radio station (1) as a primary cell and a second cell (20) served by a second radio station (2) as a secondary cell, change the primary cell from the first cell (10) to a third cell (30) served by a third radio station (3) while keeping communication status information regarding the radio terminal (1) on the second cell (20). It is thus, for example, possible to enable a communication service in the secondary cell to be continued even after the primary cell is changed when the primary cell is changed during execution of carrier aggregation (e.g., Inter-eNB CA) on a plurality of cells served by different radio stations.

公开(公告)号：US11991099B2

公开(公告)日：2024-05-21

申请号：US18089149

申请日：2022-12-27

申请人： NEC Corporation

发明人： Hisashi Futaki

IPC分类号： H04L5/00 ,  H04W8/26 ,  H04W36/00 ,  H04W72/00 ,  H04W92/20

CPC分类号： H04L5/001 ,  H04L5/0035 ,  H04L5/0062 ,  H04W8/26 ,  H04W36/0069 ,  H04W72/00 ,  H04W92/20

摘要： A first radio base station informs a second radio base station about the configuration information of a second carrier, such as NBC or EC, not having an individual first identifier, as the configuration information of the second carrier is correlated with a first carrier, such as BC, having the individual first identifier. The radio station has a function of performing communication with a radio terminal using simultaneously a plurality of carriers included in the carrier set.

公开(公告)号：US20240064819A1

公开(公告)日：2024-02-22

申请号：US18270815

申请日：2022-01-12

申请人： NEC Corporation

发明人： Maxime GRAU ,  Hisashi Futaki

IPC分类号： H04W74/08 ,  H04W74/04

CPC分类号： H04W74/0833 ,  H04W74/04

摘要： A method performed by apparatus for providing access to a communication network is disclosed. The method includes transmitting to at least one user equipment (UE) system information including random-access configuration information for configuring the UE to perform random-access procedures. The random-access configuration information includes a plurality of different physical random-access channel (PRACH) preamble formats that can be applied by the UE in a random-access procedure. The apparatus receives, from the UE, signalling for initiating a random-access procedure, the signalling including a random-access preamble having a one of the plurality of different PRACH preamble formats and communicates with the UE to continue and complete the random-access procedure initiated by the UE.

公开(公告)号：US11812489B2

公开(公告)日：2023-11-07

申请号：US17987493

申请日：2022-11-15

申请人： NEC Corporation

发明人： Hisashi Futaki ,  Hiroaki Aminaka

IPC分类号： H04W76/19 ,  H04L5/00 ,  H04W24/04 ,  H04W48/04 ,  H04B7/24 ,  H04W16/24 ,  H04W4/30 ,  H04L1/00

CPC分类号： H04W76/19 ,  H04B7/24 ,  H04L5/001 ,  H04W4/30 ,  H04W16/24 ,  H04W24/04 ,  H04W48/04 ,  H04L5/0069 ,  H04L5/0098 ,  H04L2001/0093

摘要： A radio terminal (3) can perform carrier aggregation using a first cell (10) of a first radio station (1) and a second cell (20) of a second radio station (2). The first radio station (1) performs, with the radio terminal (3), radio resource control for the first cell (10) and the second cell (20) in order to perform the carrier aggregation. At least one of the second radio station (2) and the radio terminal (3) is configured to transmit, to the first radio station (10), information about a problem occurring in a radio link in the second cell (20) between the second radio station (20) and the radio terminal (30) while the carrier aggregation of the first cell (10) and the second cell (20) is being performed.

公开(公告)号：US11764916B2

公开(公告)日：2023-09-19

申请号：US17839591

申请日：2022-06-14

申请人： NEC Corporation

发明人： Hisashi Futaki ,  Sadafuku Hayashi

IPC分类号： H04W28/02 ,  H04L5/00 ,  H04W92/20 ,  H04W88/10 ,  H04W4/00 ,  H04W12/04 ,  H04W12/03 ,  H04W12/041 ,  H04L69/14 ,  H04W76/27 ,  H04W80/02 ,  H04W48/12 ,  H04W36/14 ,  H04W36/00

CPC分类号： H04L5/001 ,  H04L5/0091 ,  H04L5/0098 ,  H04L69/14 ,  H04W4/00 ,  H04W12/03 ,  H04W12/04 ,  H04W12/041 ,  H04W28/0252 ,  H04W76/27 ,  H04W80/02 ,  H04W88/10 ,  H04W92/20 ,  H04W36/0069 ,  H04W36/14 ,  H04W48/12

摘要： 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：US11729796B2

公开(公告)日：2023-08-15

申请号：US17356943

申请日：2021-06-24

申请人： NEC Corporation

发明人： Hisashi Futaki ,  Hiroto Sugahara ,  Hiroaki Aminaka

IPC分类号： H04W72/27 ,  H04W28/082 ,  H04L5/00 ,  H04W76/15 ,  H04B7/02 ,  H04W28/086 ,  H04W72/542 ,  H04W16/32 ,  H04W92/20 ,  H04W24/10 ,  H04W52/36 ,  H04W72/12 ,  H04W52/14 ,  H04W88/06

CPC分类号： H04W72/27 ,  H04B7/02 ,  H04L5/001 ,  H04L5/0091 ,  H04W16/32 ,  H04W24/10 ,  H04W28/085 ,  H04W28/0808 ,  H04W52/367 ,  H04W72/12 ,  H04W72/542 ,  H04W76/15 ,  H04W92/20 ,  H04W52/146 ,  H04W52/365 ,  H04W88/06

摘要： A radio communication system includes a first base station that manages a first cell (110), a second base station (12) that manages a second cell (120), and a radio terminal (2). The radio terminal (2) supports dual connectivity involving a bearer split in which a first network bearer between the radio terminal (2) and a core network (3) is split over the first base station (11) and the second base station (12). The first base station (11) receives, from the second base station (12), bearer split status information about communication of the first network bearer in the second base station (12), and performs control of an access stratum related to the first network bearer. It is thus possible to contribute, for example, to an improvement in control of an access stratum when dual connectivity involving a bearer split is performed.

公开(公告)号：US11647557B2

公开(公告)日：2023-05-09

申请号：US17709715

申请日：2022-03-31

申请人： NEC Corporation

发明人： Hisashi Futaki

IPC分类号： H04W76/16 ,  H04W8/22 ,  H04W16/32

CPC分类号： H04W76/16 ,  H04W8/22 ,  H04W16/32

摘要： A master RAN node (1) associated with a master RAT (1) communicates with a secondary RAN node (2) associated with a secondary RAT and provides a radio terminal (3) with dual connectivity that uses the master RAT and the secondary RAT. In response to receiving, from the radio terminal (3) or a core network (4), terminal capability information indicating that the radio terminal (3) supports the split bearer, the master RAN node (1) uses a PDCP entity, which provides unified PDCP functionalities, for a master cell group split bearer for the radio terminal (3).

公开(公告)号：US11595870B2

公开(公告)日：2023-02-28

申请号：US17283046

申请日：2019-08-30

申请人： NEC Corporation

发明人： Tomu Tamura ,  Hisashi Futaki

IPC分类号： H04W4/00 ,  H04W36/08 ,  H04W36/00 ,  H04W36/24 ,  H04W36/32

摘要： In order to prevent deterioration of QoE of a user in intersystem handover, an apparatus according to the present invention includes: an information obtaining unit configured to obtain network slice related information related to a network slice used by a terminal apparatus in a first radio communication system; and a first communication processing unit configured to transmit, to a second network node of a second radio communication system, a message for intersystem handover of the terminal apparatus from the first radio communication system to the second radio communication system, the message including the network slice related information.