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).

  • Methods and apparatuses for transmitting control-plane messages in cells using different radio access technologies
    Patent number: 10952099
    Abstract: A radio station (2) transmits or receives, to or from a radio terminal (1) in a second cell (23, 24), a CP message containing a NAS message or an RRC message or both, when a predetermined condition is satisfied. The second cell (23, 24) uses a RAT different from that of the first cell, and is used in addition and subordinate to the first cell. The predetermined condition relates to at least one of: (a) a content or type of the CP message; (b) a type of a signalling radio bearer used to transmit the CP message; (c) a transmission cause of the CP message; and (d) a type of a core network associated with the NAS message. It is thus, for example, possible to contributing to efficient transmission of control plane (CP) messages in a radio architecture that provides interworking of two different Radio Access Technologies (RATs).
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: March 16, 2021
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • RADIO TERMINAL, BASE STATION, AND METHODS AND NON-TRANSITORY COMPUTER-READABLE MEDIA THEREFOR
    Publication number: 20210068192
    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.
    Type: Application
    Filed: October 1, 2020
    Publication date: March 4, 2021
    Applicant: NEC CORPORATION
    Inventors: Hisashi FUTAKI, Sadafuku Hayashi
  • RADIO ACCESS NETWORK NODE, RADIO TERMINAL, AND METHODS AND NON TRANSITORY COMPUTER-READABLE MEDIA THEREFOR
    Publication number: 20210029621
    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: October 9, 2020
    Publication date: January 28, 2021
    Applicant: NEC CORPORATION
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Radio terminal, radio station, and method therefor
    Patent number: 10880700
    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.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: December 29, 2020
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Apparatus related to dual connectivity
    Patent number: 10873984
    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.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: December 22, 2020
    Assignee: NEC CORPORATION
    Inventor: Sadafuku Hayashi
  • Radio terminal, base station, and methods and non-transitory computer-readable media therefor
    Patent number: 10863575
    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.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: December 8, 2020
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • RADIO STATION SYSTEM, RADIO TERMINAL, AND METHODS THEREIN
    Publication number: 20200374052
    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.
    Type: Application
    Filed: August 12, 2020
    Publication date: November 26, 2020
    Applicant: NEC CORPORATION
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • RADIO ACCESS NETWORK NODE, RADIO TERMINAL, AND METHODS AND NON-TRANSITORY COMPUTER-READABLE MEDIA THEREFOR
    Publication number: 20200367215
    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: Application
    Filed: August 4, 2020
    Publication date: November 19, 2020
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • RADIO ACCESS NETWORK NODE, RADIO TERMINAL, AND METHODS AND NON-TRANSITORY COMPUTER-READABLE MEDIA THEREFOR
    Publication number: 20200367214
    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: Application
    Filed: August 4, 2020
    Publication date: November 19, 2020
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • RADIO BASE STATION, EDGE SERVER, AND METHODS THEREIN
    Publication number: 20200359433
    Abstract: A RAN node (2) receives, from a core network node (6, 7, 8), a first identifier that is used by a service, an application, or an edge server (5) to identify a radio terminal (1) connected to the RAN node (2), and associates the first identifier with a second identifier that is used by the RAN node (2) to identify the radio terminal (1). Further, the RAN node (2) communicates with the edge server (5) using the first identifier. It is thus, for example, possible to allow an MEC server (or an MEC application hosted on the MEC server) and a radio access network (RAN) node to directly exchange therebetween a control message regarding a specific radio terminal.
    Type: Application
    Filed: July 30, 2020
    Publication date: November 12, 2020
    Applicant: NEC Corporation
    Inventors: Takanori IWAI, Daisuke MIZUKAMI, Hisashi FUTAKI, Sadafuku HAYASHI, Hajime ZEMBUTSU, Yoshinori WATANABE, Toshiyuki TAMURA
  • COMMUNICATION SYSTEM
    Publication number: 20200323010
    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.
    Type: Application
    Filed: March 23, 2017
    Publication date: October 8, 2020
    Applicant: NEC CORPORATION
    Inventors: Sivapathalingham SIVAVAKEESAR, Sadafuku HAYASHI
  • RADIO ACCESS NETWORK NODE, AND METHOD AND NON-TRANSITORY COMPUTER READABLE MEDIUM THEREFOR
    Publication number: 20200314696
    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: June 12, 2020
    Publication date: October 1, 2020
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Wireless communication system, base station device, move control node, and method of wireless communication
    Patent number: 10791473
    Abstract: A base station is provided. The base station includes a transmitter and a receiver. The transmitter sends, to a node including mobility management function, a first message, the first message including both first information about a tracking area supported in the base station and second information about a size of a cell of the base station. The receiver receives a response message of the first message from the node including mobility management function.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: September 29, 2020
    Assignee: NEC CORPORATION
    Inventor: Sadafuku Hayashi
  • Radio station system, radio terminal, and methods therein
    Patent number: 10779185
    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.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: September 15, 2020
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Sadafuku Hayashi
  • Radio base station, edge server, and methods therein
    Patent number: 10764945
    Abstract: A RAN node (2) receives, from a core network node (6, 7, 8), a first identifier that is used by a service, an application, or an edge server (5) to identify a radio terminal (1) connected to the RAN node (2), and associates the first identifier with a second identifier that is used by the RAN node (2) to identify the radio terminal (1). Further, the RAN node (2) communicates with the edge server (5) using the first identifier. It is thus, for example, possible to allow an MEC server (or an MEC application hosted on the MEC server) and a radio access network (RAN) node to directly exchange therebetween a control message regarding a specific radio terminal.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: September 1, 2020
    Assignee: NEC Corporation
    Inventors: Takanori Iwai, Daisuke Mizukami, Hisashi Futaki, Sadafuku Hayashi, Hajime Zembutsu, Yoshinori Watanabe, Toshiyuki Tamura
  • RADIO STATION SYSTEM, RADIO TERMINAL, AND METHODS THEREIN
    Publication number: 20200275315
    Abstract: A radio station (2) transmits or receives, to or from a radio terminal (1) in a second cell (23, 24), a CP message containing a NAS message or an RRC message or both, when a predetermined condition is satisfied. The second cell (23, 24) uses a RAT different from that of the first cell, and is used in addition and subordinate to the first cell. The predetermined condition relates to at least one of: (a) a content or type of the CP message; (b) a type of a signalling radio bearer used to transmit the CP message; (c) a transmission cause of the CP message; and (d) a type of a core network associated with the NAS message. It is thus, for example, possible to contributing to efficient transmission of control plane (CP) messages in a radio architecture that provides interworking of two different Radio Access Technologies (RATs).
    Type: Application
    Filed: December 14, 2016
    Publication date: August 27, 2020
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • BASE STATION APPARATUS AND METHOD THEREOF
    Publication number: 20200267608
    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.
    Type: Application
    Filed: February 25, 2020
    Publication date: August 20, 2020
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • RADIO ACCESS NETWORK NODE, CORE NETWORK NODE, RADIO TERMINAL, AND METHODS THEREFOR
    Publication number: 20200260325
    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: Application
    Filed: April 11, 2018
    Publication date: August 13, 2020
    Applicant: NEC CORPORATION
    Inventors: Hisashi FUTAKI, Sadafuku HAYASHI
  • Apparatus and method for radio communication
    Patent number: 10742365
    Abstract: To enable delivery confirmation for data transmitted from a base station to a terminal apparatus via the access point. An apparatus according to an example aspect of the present invention includes an information acquisition unit configured to acquire a data unit from a packet data convergence protocol (PDCP) layer of a base station, and a communication processing unit configured to transmit the data unit to a terminal apparatus via an access point of a wireless local area network using a protocol enabling delivery confirmation.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: August 11, 2020
    Assignee: NEC CORPORATION
    Inventors: Sadafuku Hayashi, Daisuke Ogura, Hisashi Futaki
  • BASE STATION, WIRELESS COMMUNICATION SYSTEM, AND COMMUNICATION METHOD
    Publication number: 20200252834
    Abstract: This wireless communication system has a first base station, and a second base station whereby downlink data received from a core network can be transmitted to a terminal via the second base station and the first base station. The second base station transmits, to the first base station, information that makes it possible to identify whether or not flow control can be carried out.
    Type: Application
    Filed: April 24, 2020
    Publication date: August 6, 2020
    Inventor: Sadafuku HAYASHI