Patents by Inventor Sadafuku Hayashi

Sadafuku Hayashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11943819
    Abstract: A radio terminal (1) is configured to transmit, to a radio station (2), a Radio Resource Control (RRC) connection setup complete message including a UE assistance information element indicating which of a plurality of communication architecture types for data packet transmission relating to Cellular Internet of Things (CIoT) the radio terminal desires to use, the radio terminal supports, or the radio terminal is configured with. As a result, with regard to a specific communication procedure involving determination of communication architecture used for a radio terminal serving as a CIoT device, it is for example possible to contribute to enhancement of efficiency of the communication procedure, reduction of signaling messages, or appropriate CN selection.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: March 26, 2024
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Patent number: 11943789
    Abstract: A communication system is described in which an MBMS service is provided by unicast or broadcast/multicast communication in dependence on whether the number of mobile communication devices indicating an interest in receiving the service is below or above a broadcast threshold. An improved procedure for counting the number of mobile communication devices interested in receiving the MBMS service is also disclosed.
    Type: Grant
    Filed: July 30, 2021
    Date of Patent: March 26, 2024
    Assignee: NEC CORPORATION
    Inventors: Caroline Jactat, Sadafuku Hayashi, Jonathan Lewis
  • Patent number: 11937319
    Abstract: A communication system is disclosed in which a distributed base station apparatus comprises a central unit for control plane signalling (CU-CP), at least one a central unit for user plane signalling (CU-UP), and at least one distributed unit. The CU-CP obtains information indicating whether a security configuration is supported by a CU-UP and selects a security configuration for an item of user equipment (UE) based on the obtained information.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: March 19, 2024
    Assignee: NEC CORPORATION
    Inventors: Yuhua Chen, Sadafuku Hayashi, Hisashi Futaki, Jagdeep Ahluwalia Singh, Neeraj Gupta, Chadi Khirallah
  • Patent number: 11917633
    Abstract: A second RAN node (2) associated with a second RAT sends a radio resource configuration of the second RAT to a radio terminal (3) via a first RAN node (1) associated with a first RAT. The radio resource configuration explicitly or implicitly indicates at least one numerology that is included in multiple numerologies supported by the second RAT and is different from a reference numerology. It is thus, for example, possible to allow a radio terminal to be configured with a numerology of a cell served by a secondary gNB or a target gNB in Inter-RAT Dual Connectivity between E-UTRA and NR and in a handover from E-UTRA to NR.
    Type: Grant
    Filed: July 23, 2021
    Date of Patent: February 27, 2024
    Assignee: NEC Corporation
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Publication number: 20240063933
    Abstract: A method for maintaining finer synchronicity requirement (e.g. less than 1 ?s synchronicity) between sync master clock and UE clock in NR IIOT is disclosed. The present disclosure introduces a method to apply the UE clock update depending on the UL timing advance reception time. The present disclosure also introduces a new signaling to indicate scheduling request ID for propagation delay change and based on which triggering timing advance to maintain the finer synchronicity requirement between sync master and UE clock. This disclosure also introduces a new method to compute the propagation delay change at UE, and thereby performing propagation delay compensation to maintain finer synchronicity requirement between sync master and UE clock.
    Type: Application
    Filed: January 11, 2022
    Publication date: February 22, 2024
    Applicant: NEC Corporation
    Inventors: Venkatarao Gonuguntla, Hisashi Futaki, Tetsu Ikeda, Sadafuku Hayashi, Manikantan Srinivasan
  • Patent number: 11910258
    Abstract: In response to receiving from a source RAN node (2), on a direct interface (101), a message requesting a handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) receives at least one of slice information and flow information from a core network (5), and controls communication of the radio terminal (1) based on at least one of the slice information and the flow information. The slice information relates to a network slice in the second network. The flow information relates to at least one session to be established in the second network, serving as a bearer-less network, in order to transfer at least one packet flow of the radio terminal (1). It is thus possible, for example, to provide an Inter-RAT handover procedure involving transfer of handover signaling messages on a direct inter-base-station interface.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: February 20, 2024
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Patent number: 11909676
    Abstract: A communication system is disclosed in which an NR radio access network (RAN) node identifies resources, that the NR RAN node is to use for transmissions, for protection from interference from another RAN node. The NR RAN node sends, to the other RAN node, information indicating the identified resources for protection from interference. The information indicating the identified resources comprises a list of parameters, typically including resource bitmaps, based on which the other RAN node is able to determine the resources for protection from interference.
    Type: Grant
    Filed: September 21, 2022
    Date of Patent: February 20, 2024
    Assignee: NEC CORPORATION
    Inventors: Chadi Khirallah, Yassin Aden Awad, Sadafuku Hayashi, Tao Guo, Robert Arnott
  • Publication number: 20240056895
    Abstract: A radio access network (RAN) node (11) is configured to send, to another RAN node (12), first control information regarding at least one of one or more bandwidth parts (BWPs) configured in a system bandwidth. It is thus, for example, possible to contribute to inter-radio access network (RAN) node (e.g., inter-gNB) signaling enhanced to handle bandwidth parts.
    Type: Application
    Filed: October 25, 2023
    Publication date: February 15, 2024
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Publication number: 20240023006
    Abstract: A second RAN node (2) sends to a radio terminal (3), via a first RAN node (1), an indication of available on-demand system information that is available in a cell of the second RAN node (2). It is thus, for example, possible to enabling notifying a UE of an indication about on-demand system information available in a cell served by a secondary gNB of Inter-RAT dual connectivity between E-UTRA and NR, or available in a cell served by a target gNB of Inter-RAT handover from E-UTRA to NR.
    Type: Application
    Filed: September 21, 2023
    Publication date: January 18, 2024
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Patent number: 11877187
    Abstract: A master RAN node (1) sends, to a control plane function (5) in a core network (4), a modification request for modification of a first PDU session already established between a radio terminal (3) and a user plane function (6) in the core network (4). The modification request implicitly or explicitly indicates that PDU session split is needed for the first PDU session. The modification request causes the control plane function (5) to control the user plane function (6) to move a specific one or more QoS flows of a plurality of QoS flows associated with the first PDU session from a first tunnel between the user plane function (6) and the master RAN node (1) to a second tunnel between the user plane function (6) and a secondary RAN node (2). This contributes, for example, to implementing PDU session split in a radio communication network.
    Type: Grant
    Filed: January 5, 2023
    Date of Patent: January 16, 2024
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Patent number: 11843975
    Abstract: A radio access network (RAN) node (11) is configured to send, to another RAN node (12), first control information regarding at least one of one or more bandwidth parts (BWPs) configured in a system bandwidth. It is thus, for example, possible to contribute to inter-radio access network (RAN) node (e.g., inter-gNB) signaling enhanced to handle bandwidth parts.
    Type: Grant
    Filed: February 11, 2022
    Date of Patent: December 12, 2023
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Patent number: 11838801
    Abstract: A radio access network (RAN) node (11) is configured to send, to another RAN node (12), first control information regarding at least one of one or more bandwidth parts (BWPs) configured in a system bandwidth. It is thus, for example, possible to contribute to inter-radio access network (RAN) node (e.g., inter-gNB) signaling enhanced to handle bandwidth parts.
    Type: Grant
    Filed: October 27, 2021
    Date of Patent: December 5, 2023
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Patent number: 11838819
    Abstract: In response to receiving from a source RAN node (2), on a direct interface (101), a message requesting a handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) receives at least one of slice information and flow information from a core network (5), and controls communication of the radio terminal (1) based on at least one of the slice information and the flow information. The slice information relates to a network slice in the second network. The flow information relates to at least one session to be established in the second network, serving as a bearer-less network, in order to transfer at least one packet flow of the radio terminal (1). It is thus possible, for example, to provide an Inter-RAT handover procedure involving transfer of handover signaling messages on a direct inter-base-station interface.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: December 5, 2023
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Patent number: 11825404
    Abstract: A second RAN node (2) sends to a radio terminal (3), via a first RAN node (1), an indication of available on-demand system information that is available in a cell of the second RAN node (2). It is thus, for example, possible to enabling notifying a UE of an indication about on-demand system information available in a cell served by a secondary gNB of Inter-RAT dual connectivity between E-UTRA and NR, or available in a cell served by a target gNB of Inter-RAT handover from E-UTRA to NR.
    Type: Grant
    Filed: October 9, 2020
    Date of Patent: November 21, 2023
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Publication number: 20230370906
    Abstract: A secondary node (2) transmits to a radio terminal (3), via a master node (1), a first RRC message indicating an execution condition of a conditional primary cell change of a primary cell of a secondary cell group from a first cell to a second cell. In addition, the secondary node (2) receives, via the master node (1), a second RRC message that is transmitted from the radio terminal (3) in response to a satisfaction of the execution condition. This contributes to, for example, allowing the secondary node to be aware of a satisfaction of an execution condition of a conditional PSCell change where RRC signaling between the secondary node and the radio terminal is performed via the master node.
    Type: Application
    Filed: July 27, 2023
    Publication date: November 16, 2023
    Applicant: NEC CORPORATION
    Inventors: Hisashi FUTAKI, Sadafuku Hayashi
  • Publication number: 20230370928
    Abstract: In response to receiving from a source RAN node (2), on a direct interface (101), a message requesting a handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) receives at least one of slice information and flow information from a core network (5), and controls communication of the radio terminal (1) based on at least one of the slice information and the flow information. The slice information relates to a network slice in the second network. The flow information relates to at least one session to be established in the second network, serving as a bearer-less network, in order to transfer at least one packet flow of the radio terminal (1). It is thus possible, for example, to provide an Inter-RAT handover procedure involving transfer of handover signaling messages on a direct inter-base-station interface.
    Type: Application
    Filed: July 24, 2023
    Publication date: November 16, 2023
    Applicant: NEC CORPORATION
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Publication number: 20230363026
    Abstract: A master node (1) requests a conditional PSCell addition (CPA), via an SN ADDITION REQUEST message (301), to a candidate secondary node (2). The master node (1) also requests the candidate secondary node (2) to configure an SN terminated MCG bearer via the SN ADDITION REQUEST message (301). This can, for example, contribute to mitigating a communication continuity problem caused by a Conditional PSCell Addition (CPA) failure.
    Type: Application
    Filed: May 24, 2021
    Publication date: November 9, 2023
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Publication number: 20230354159
    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.
    Type: Application
    Filed: June 8, 2023
    Publication date: November 2, 2023
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Publication number: 20230345532
    Abstract: A communication system is disclosed in which a base station performs Listen-Before-Talk (LBT) communication with an item of user equipment (UE) via at least one cell. When the base station of the UE detects a failure associated with the LBT communication in at least one cell, the base station transmits a signalling message to another node (e.g., a central unit, a master node, a secondary node, or a core network node), the signalling message comprising information indicating that LBT failure has been detected. The information is used by the other node in managing the LBT communication with the UE (e.g., releasing resources, deactivating cells, etc.).
    Type: Application
    Filed: July 30, 2021
    Publication date: October 26, 2023
    Applicant: NEC Corporation
    Inventors: Chadi KHIRALLAH, Sadafuku HAYASHI
  • Patent number: 11800420
    Abstract: A target RAN node (3) receives, from a core network (5), a message requesting a handover of a radio terminal (1) from a bearer-based network to a bearer-less network. This handover request message includes flow information related to at least one session to be established in the bearer-less network in order to transfer at least one packet flow of the radio terminal (1). The target RAN node (3) transmits, to the core network (5), a handover acknowledge response message containing a transparent container that includes a radio resource configuration information derived from the flow information and is to be forwarded to a source RAN node associated (2) through the core network (5). It is thus, for example, possible to appropriately configuring an AS layer of a target RAT in an inter-RAT handover.
    Type: Grant
    Filed: April 4, 2022
    Date of Patent: October 24, 2023
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi