公开(公告)号：US20230354159A1

公开(公告)日：2023-11-02

申请号：US18207550

申请日：2023-06-08

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Sadafuku HAYASHI

IPC: H04W48/08 ,  H04W76/27 ,  H04W36/08 ,  H04W88/02 ,  H04W88/08

CPC classification number: H04W48/08 ,  H04W36/08 ,  H04W76/27 ,  H04W88/02 ,  H04W88/08

Abstract: A base station (1) controls state transitions of a radio terminal (2) among first to third RRC states. In addition, the base station (1) explicitly or implicitly informs the radio terminal (2) about whether a network slice configured in the radio terminal (2) for data communication at least in the first RRC state is available in each cell included in a RAN notification area configured by a RAN (3). It is thus, for example, possible to allow a radio terminal in a first state (e.g., RRC_INACTIVE state) to be easily aware of the availability of network slices in a cell to be reselected or a reselected cell.

公开(公告)号：US20230254901A1

公开(公告)日：2023-08-10

申请号：US18011670

申请日：2021-11-09

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Sadafuku HAYASHI

IPC: H04W74/08 ,  H04L5/00

CPC classification number: H04W74/0833 ,  H04L5/0096 ,  H04L5/0035

Abstract: When a Secondary Cell Group (SCG) containing a Primary SCG Cell (PSCell) is deactivated upon a PSCell addition or a PSCell mobility, a User Equipment (3) performs random access to the PSCell in response to the PSCell addition or the PSCell mobility without waiting until a future SCG activation. This can contribute, for example, to proper random access when the SCG is deactivated.

公开(公告)号：US20220256637A1

公开(公告)日：2022-08-11

申请号：US17630003

申请日：2020-06-17

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Sadafuku HAYASHI

IPC: H04W76/19 ,  H04W76/15 ,  H04W76/27 ,  H04W76/34

Abstract: A master node (MN) (1) controls the MN (1) to enable, for a radio terminal (3), dual connectivity using a Master Cell Group (MCG) provided by the MN (1) and a Secondary Cell Group (SCG) provided by a secondary node (SN) (2). The MN (1) sends to the SN (2) a first message related to a modification or release of a configuration or resource in the SN (2) regarding the dual connectivity. The first message explicitly or implicitly indicates that the modification or release is related to a failure of the MCG or recovery from the failure of the MCG. This, for example, allows the SN to distinguish a message regarding modification or release of an SN configuration (or resource) sent from an MN to the SN for recovery from an MCG failure from other messages.

公开(公告)号：US20220132375A1

公开(公告)日：2022-04-28

申请号：US17429814

申请日：2020-02-12

Applicant: NEC Corporation

Inventor： Chadi KHIRALLAH ,  Jagdeep Ahluwalia SINGH ,  Sadafuku HAYASHI ,  Neeraj GUPTA

IPC: H04W28/22

Abstract: A communication system is disclosed in which a base station apparatus obtains, from at least one secondary node (SN) handling user-plane transmissions for a user equipment (UE), information identifying a total integrity protected data rate for all Protocol Data Unit (PDU) sessions associated with the UE at that SN. When the information from the at least one SN indicates that the total integrity protected data rate for all PDU sessions associated with the UE at that SN exceeds an associated data rate portion, the base station apparatus updates at least one of: said data rate portion; and at least one PDU session associated with the UE at that SN.

公开(公告)号：US20210410021A1

公开(公告)日：2021-12-30

申请号：US17288200

申请日：2019-08-23

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Sadafuku HAYASHI

IPC: H04W36/00 ,  H04W36/12

Abstract: A central unit (1) of a base station sends, to a distributed unit (2) of the base station, a message requesting addition of a secondary cell for carrier aggregation. The message contains a first information element indicating that the secondary cell needs to be initially activated or dormant. It is thus, for example, possible to contribute to improvement for enabling direct configuration of a secondary cell state in an architecture where a base station divides into a central unit and a distributed unit.

公开(公告)号：US20210392651A1

公开(公告)日：2021-12-16

申请号：US17287003

申请日：2019-08-20

Applicant: NEC Corporation

Inventor： Hisashi FUTAKI ,  Sadafuku HAYASHI

IPC: H04W72/08 ,  H04W72/04 ,  H04W24/10

Abstract: When a secondary cell of carrier aggregation has been activated, a radio terminal (2) communicates with a radio access network (RAN) node (1) in an active downlink (DL) bandwidth part (BWP) selected from among a plurality of DL BWPs for the secondary cell. In addition, when the secondary cell is in a dormant state, the radio terminal (2) transmits to the RAN node (1), via a primary cell or another activated serving cell of the carrier aggregation, a channel state information report for a target DL BWP selected from among the plurality of DL BWPs. It is thus, for example, possible to allow the radio terminal to perform channel a state information measurement on a dormant SCell that has been configured with a plurality of BWPs.

公开(公告)号：US20210144788A1

公开(公告)日：2021-05-13

申请号：US17099138

申请日：2020-11-16

Applicant: NEC CORPORATION

Inventor： Sadafuku HAYASHI

IPC: H04W76/15 ,  H04W76/30 ,  H04W76/34 ,  H04L5/00 ,  H04W16/32

Abstract: To enable reduction of the occurrence of unnecessary operations in a case with a SCG bearer. An apparatus of the present invention includes: a first communication processing unit configured to communicate with a terminal apparatus over a master cell group (MCG) bearer for dual connectivity of the terminal apparatus; and a second communication processing unit configured to receive, from a secondary base station which communicates with the terminal apparatus over a secondary cell group (SCG) bearer for the dual connectivity, a first message requesting a release of the secondary base station. The second communication processing unit is configured to transmit, to the secondary base station, a second message indicating a rejection of the release.

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：US20200323010A1

公开(公告)日：2020-10-08

申请号：US16086203

申请日：2017-03-23

Applicant: NEC CORPORATION

Inventor： Sivapathalingham SIVAVAKEESAR ,  Sadafuku HAYASHI

IPC: H04W76/19 ,  H04W76/11 ,  H04W36/00 ,  H04W8/08 ,  H04W4/70 ,  H04W76/27

Abstract: A system is disclosed in which a base station receives, from a core network node (e.g. a mobility management entity), a resume identifier associated with a communication device located within a cell of the base station. The base station retrieves, based on the received resume identifier, a user equipment (UE) context associated with the communication device, for use in resumption of a suspended communication connection (e.g. a radio resource control connection) by the communication device.

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.