公开(公告)号：US20220311553A1

公开(公告)日：2022-09-29

申请号：US17806666

申请日：2022-06-13

Applicant: Mitsubishi Electric Corporation

Inventor： Tadahiro SHIMODA ,  Mitsuru MOCHIZUKI ,  Masayuki NAKAZAWA ,  Fumihiro HASEGAWA

IPC: H04L1/18 ,  H04W72/04 ,  H04L25/02 ,  H04L5/00 ,  H04W80/02 ,  H04W24/10 ,  H04W74/08 ,  H04W76/27 ,  H04W48/10 ,  H04W28/04 ,  H04W28/06

Abstract: Provided is a communication system capable of suppressing decrease in a transmission rate. An eNB communicates with a UE using a self-contained subframe. The self-contained subframe includes a downlink signal to be transmitted from the eNB to the UE, and an uplink signal to be transmitted from the UE to the eNB in response to the downlink signal. The uplink signal has a structure including an uplink control signal indicating information for controlling transmission of the uplink signal, and uplink user data to be transmitted before and after the uplink control signal. The eNB notifies the UE of a structure of the uplink signal. The eNB may predetermine scheduling for retransmission to retransmit the downlink signal, before performing initial transmission of the downlink signal.

公开(公告)号：US20220103313A1

公开(公告)日：2022-03-31

申请号：US17550642

申请日：2021-12-14

Applicant: Mitsubishi Electric Corporation

Inventor： Kuniyuki SUZUKI ,  Masayuki NAKAZAWA

IPC: H04L5/00 ,  H04L27/26 ,  H04W72/04

Abstract: Provided is a technology capable of securing communication quality without providing an additional function such as phase correction. A base station device and a communication terminal device when operating as a transmitting device rotate inverse fast Fourier transform (IFFT) output, and copy a last portion of the rotated IFFT output to a head of the rotated IFFT output as a cyclic prefix (CP) to thereby generate a transmission signal so that there is no phase rotation at a head of a demodulation reception window set in a receiving device.

公开(公告)号：US20180176839A1

公开(公告)日：2018-06-21

申请号：US15127230

申请日：2015-03-16

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Takuya OHARA ,  Taisei SUEMITSU ,  Mitsuru MOCHIZUKI ,  Kuniyuki SUZUKI ,  Masayuki NAKAZAWA ,  Daisuke HIRAMATSU

IPC: H04W36/08 ,  H04W36/28 ,  H04W16/32 ,  H04L5/00

Abstract: When being connected to a macro cell (S-MeNB) and a small cell (SeNB), a user equipment device performs a pre-handover process of disconnecting the connection with the SeNB before a handover process of switching a macro cell connected with the UE from the macro cell (S-MeNB) that is a moving source to a macro cell (T-MeNB) that is a moving destination along with moving of the UE, and after the handover process, performs a post-handover process of reestablishing the connection with the SeNB.

公开(公告)号：US20170238301A1

公开(公告)日：2017-08-17

申请号：US15518536

申请日：2015-10-26

Applicant: Mitsubishi Electric Corporation

Inventor： Masayuki NAKAZAWA ,  Kuniyuki SUZUKI ,  Mitsuru MOCHIZUKI ,  Koji ONO ,  Takayuki NONAMI ,  Naohito TOMOE ,  Fumiki HASEGAWA

IPC: H04W72/04 ,  H04L5/00

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

公开(公告)号：US20240405925A1

公开(公告)日：2024-12-05

申请号：US18799154

申请日：2024-08-09

Applicant: Mitsubishi Electric Corporation

Inventor： Tadahiro SHIMODA ,  Mitsuru MOCHIZUKI ,  Masayuki NAKAZAWA ,  Fumihiro HASEGAWA

IPC: H04L1/1812 ,  H04L1/1867 ,  H04L5/00 ,  H04L25/02 ,  H04W24/10 ,  H04W28/04 ,  H04W28/06 ,  H04W48/10 ,  H04W72/04 ,  H04W72/0446 ,  H04W74/0833 ,  H04W76/27 ,  H04W80/02

Abstract: Provided is a communication system capable of suppressing decrease in a transmission rate. An eNB communicates with a UE using a self-contained subframe. The self-contained subframe includes a downlink signal to be transmitted from the eNB to the UE, and an uplink signal to be transmitted from the UE to the eNB in response to the downlink signal. The uplink signal has a structure including an uplink control signal indicating information for controlling transmission of the uplink signal, and uplink user data to be transmitted before and after the uplink control signal. The eNB notifies the UE of a structure of the uplink signal. The eNB may predetermine scheduling for retransmission to retransmit the downlink signal, before performing initial transmission of the downlink signal.

公开(公告)号：US20240073787A1

公开(公告)日：2024-02-29

申请号：US18388280

申请日：2023-11-09

Applicant: Mitsubishi Electric Corporation

Inventor： Miho MAEDA ,  Mitsuru MOCHIZUKI ,  Taiga SAEGUSA ,  Yasushi IWANE ,  Yuji KAKEHI ,  Masayuki NAKAZAWA ,  Taisei SUEMITSU

IPC: H04W48/08 ,  H04W4/08 ,  H04W8/02 ,  H04W72/04

CPC classification number: H04W48/08 ,  H04W4/08 ,  H04W8/02 ,  H04W72/04 ,  Y02B70/30 ,  Y02D30/70

Abstract: A closed subscriber group (CSG) cell allows use of subscribers. To receive the service by the CSG cell, a CSG-ID is notified to a user equipment, but cannot be obtained outside the reach of radio waves from a non-CSG cell. Base stations respectively provided to a CSG cell and a non-CSG cell, and access is made to the CSG cell with the use of a CSG-ID issued when use of the CSG cell is allowed, the base station refers to the notified identification information of a user equipment and then transmits a tracking area update request from the user equipment to a core network. The core network determines whether the user equipment is allowed to use the CSG cell and, if allowed, transmits a signal for assignment of radio resources to the user equipment and the CSG-ID. The user equipment accesses the CSG cell with the CSG-ID.

公开(公告)号：US20230199821A1

公开(公告)日：2023-06-22

申请号：US18171928

申请日：2023-02-21

Applicant: Mitsubishi Electric Corporation

Inventor： Mitsuru MOCHIZUKI ,  Miho MAEDA ,  Yasushi IWANE ,  Yuji KAKEHI ,  Masayuki NAKAZAWA ,  Taisei SUEMITSU

IPC: H04W72/541 ,  H04W72/20 ,  H04L1/1812 ,  H04W28/02

CPC classification number: H04W72/541 ,  H04W72/20 ,  H04L1/1812 ,  H04W28/0236 ,  H04W84/045

Abstract: A mobile communication system capable of easily notifying the interference-related information and avoiding interference in a situation in which a macro cell and local nodes are deployed to coexist. In the system, a macro cell (eNB) notifies, via user equipments (UEs) present in a coverage, HeNBs present in the coverage of the interference-related information related to the interference to a physical resource to be used, for example, a high interference indication (HII) and an overload indicator (OI).

公开(公告)号：US20230142356A1

公开(公告)日：2023-05-11

申请号：US18095597

申请日：2023-01-11

Applicant: Mitsubishi Electric Corporation

Inventor： Masayuki NAKAZAWA ,  Kuniyuki SUZUKI ,  Mitsuru MOCHIZUKI ,  Koji ONO ,  Takayuki NONAMI ,  Naohito TOMOE ,  Fumiki HASEGAWA

IPC: H04W72/51 ,  H04W72/04 ,  H04J11/00 ,  H04W28/06 ,  H04L27/26 ,  H04L5/00

CPC classification number: H04W72/51 ,  H04W72/04 ,  H04J11/00 ,  H04W28/06 ,  H04L27/26 ,  H04L5/0007 ,  H04L5/0069 ,  H04W88/06

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

公开(公告)号：US20210176815A1

公开(公告)日：2021-06-10

申请号：US17178581

申请日：2021-02-18

Applicant: Mitsubishi Electric Corporation

Inventor： Mitsuru MOCHIZUKI ,  Kuniyuki SUZUKI ,  Masayuki NAKAZAWA ,  Noriyuki FUKUI ,  Haruka NOZAWA

IPC: H04W76/28 ,  H04W48/00 ,  H04W48/16 ,  H04W52/02 ,  H04W48/20 ,  H04W8/02

Abstract: A narrow-bandwidth terminal device performs radio communication at a bandwidth narrower than a system bandwidth. The narrow-bandwidth terminal device in an idle state camps on a cell, and performs discontinuous reception of a signal transmitted from the cell. The terminal device also determines a reception condition of the signal, for example, whether the signal can be received. When it is determined that the signal cannot be received, the narrow-bandwidth terminal device moves out of a coverage area of the cell while continuing to perform the discontinuous reception. When it is determined that a discontinuous reception timer has been completed, the narrow-bandwidth terminal device continues to perform the discontinuous reception.

公开(公告)号：US20190268878A1

公开(公告)日：2019-08-29

申请号：US16320119

申请日：2017-07-31

Applicant: Mitsubishi Electric Corporation

Inventor： Masayuki NAKAZAWA ,  Mitsuru MOCHIZUKI ,  Hideo UMEHARA ,  Kuniyuki SUZUKI

IPC: H04W68/10 ,  H04W72/00 ,  H04B7/024 ,  H04W76/15

Abstract: In a communication system, a plurality of base stations includes an MeNB being a first base station, and a plurality of SeNBs to be connected to the MeNB. At least one of control plane data about control of communication and user plane data about a user is transmitted to and received from a user equipment (UE) via the first base station being the MeNB. The control plane data and the user plane data are contained in information provided by a core network about communication with the UE. The communication system can simplify processing of at least one of control plane data and user plane data when a communication terminal device communicates with a plurality of base station devices.