公开(公告)号：US20230049652A1

公开(公告)日：2023-02-16

申请号：US17978257

申请日：2022-11-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoki MURAKAMI ,  Yusuke ASAI ,  Riichi KUDO ,  Koichi ISHIHARA ,  Masato MIZOGUCHI ,  Takeo ICHIKAWA

IPC: H04L27/26 ,  H04J11/00 ,  H04L5/00 ,  H04W28/16 ,  H04B7/024 ,  H04B7/06 ,  H04B7/0452 ,  H04B7/0456 ,  H04W88/08

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

公开(公告)号：US20210337599A1

公开(公告)日：2021-10-28

申请号：US17318137

申请日：2021-05-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Riichi KUDO ,  Hirantha Sithira ABEYSEKERA ,  Munehiro MATSUI ,  Shoko SHINOHARA ,  Yasushi TAKATORI ,  Takeo ICHIKAWA ,  Masato MIZOGUCHI

IPC: H04W74/08 ,  H04W72/08 ,  H04W72/14

Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.

公开(公告)号：US20210258047A1

公开(公告)日：2021-08-19

申请号：US17306084

申请日：2021-05-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoki MURAKAMI ,  Yusuke ASAI ,  Riichi KUDO ,  Koichi ISHIHARA ,  Masato MIZOGUCHI ,  Takeo ICHIKAWA

IPC: H04B7/0452 ,  H04J11/00 ,  H04L5/00 ,  H04L27/26 ,  H04W28/16 ,  H04B7/024 ,  H04B7/06 ,  H04B7/0456 ,  H04W88/08

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

公开(公告)号：US20200053774A1

公开(公告)日：2020-02-13

申请号：US16498869

申请日：2018-03-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Akiyoshi INOKI ,  Hirantha ABEYSEKERA ,  Munehiro MATSUI ,  Kenichi KAWAMURA ,  Yasushi TAKATORI ,  Takeo ICHIKAWA ,  Akira KISHIDA ,  Yoshifumi MORIHIRO ,  Takahiro ASAI

IPC: H04W74/08

Abstract: An AP and UE, which perform access control using CSMA/CA, perform a step judging an exposed level in transmission of the AP based on a congesting level in transmission, which is caused by a wireless station in defer transmission that is in a neighborhood of the AP; a step judging an exposed level in reception of the UE based on a congesting level in reception, which is caused by a wireless station in defer transmission that is in a neighborhood of the UE; and a step performing control which changes a channel of the AP, when the exposed level in transmission cannot satisfy expected quality of the AP, and performing control which changes a connected AP of the UE, or control which changes to other network, when the exposed level in transmission or in reception cannot satisfy required quality of the UE or the expected quality of the AP.

公开(公告)号：US20190081666A1

公开(公告)日：2019-03-14

申请号：US16185859

申请日：2018-11-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoki MURAKAMI ,  Yusuke ASAI ,  Riichi KUDO ,  Koichi ISHIHARA ,  Masato MIZOGUCHI ,  Takeo ICHIKAWA

IPC: H04B7/0452 ,  H04W28/16 ,  H04L5/00 ,  H04B7/06 ,  H04B7/0456 ,  H04B7/024 ,  H04L27/26 ,  H04J11/00 ,  H04W88/08

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.