公开(公告)号：EP4243477A3

公开(公告)日：2023-12-20

申请号：EP23188575.7

申请日：2014-05-23

申请人： Nippon Telegraph And Telephone Corporation

发明人： FUKUZONO, Hayato ,  MURAKAMI, Tomoki ,  KUDO, Riichi ,  SHINOHARA, Shoko ,  TAKATORI, Yasushi ,  MIZOGUCHI, Masato

IPC分类号： H04W16/28 ,  H04L25/02 ,  H04B7/0417 ,  H04B7/06

摘要： A wireless communication apparatus includes a designation unit which generates format designation information for designating a format of transmission and reception for another wireless communication apparatus, a first transmission unit which wirelessly transmits the format designation information to the other wireless communication apparatus, an acquisition unit which acquires a packet, a propagation channel estimation unit which estimates uplink propagation channel information indicating a propagation channel from the other wireless communication apparatus to the wireless communication apparatus based on the packet, a calibration coefficient calculation unit which calculates a calibration coefficient based on downlink propagation channel information indicating a propagation channel from the wireless communication apparatus to the other wireless communication apparatus and the uplink propagation channel information, a transmission weight value calculation unit which calculates a transmission weight value based on the calibration coefficient and the uplink propagation channel information, and a second transmission unit which wirelessly transmits a predetermined signal to the other wireless communication apparatus based on the transmission weight value.

公开(公告)号：EP3340719A1

公开(公告)日：2018-06-27

申请号：EP16839136.5

申请日：2016-08-15

申请人： Nippon Telegraph And Telephone Corporation

发明人： KUDO, Riichi ,  ABEYSEKERA, Hirantha Sithira ,  MATSUI, Munehiro ,  ICHIKAWA, Takeo ,  TAKATORI, Yasushi ,  MIZOGUCHI, Masato

IPC分类号： H04W72/12 ,  H04W28/14 ,  H04W74/00 ,  H04W84/12

摘要： Provided is a wireless communication system which performs downlink data transmission based on a transmission opportunity acquired by a wireless access point (hereinafter referred to as TXOP access) or a transmission opportunity acquired by a wireless station and granted to the wireless access point (hereinafter referred to as RXOP access), when performing the downlink data transmission from the wireless access point to the wireless station based on a random access scheme, in which the wireless access point includes a control unit performing, on a transmission buffer which sequentially stores data frames to be transmitted for each of wireless stations, processing which lowers an order of priority of the data frames which are to be destined for the wireless station A by the TXOP access at the transmission buffer according to a transmission status of the data frames destined for a wireless station A by the RXOP access.

公开(公告)号：EP3340678A1

公开(公告)日：2018-06-27

申请号：EP16839137.3

申请日：2016-08-15

申请人： Nippon Telegraph And Telephone Corporation

发明人： SHINOHARA, Shoko ,  INOUE, Yasuhiko ,  MIZOGUCHI, Masato

IPC分类号： H04W28/18 ,  H04W74/08 ,  H04W84/12

CPC分类号： H04W48/06 ,  H04W28/18 ,  H04W52/243 ,  H04W72/082 ,  H04W74/08 ,  H04W74/0816 ,  H04W84/12

摘要： Provided is a wireless communication system in which a plurality of basic service sets (BSSs) performing wireless transmission from a transmitting station to a destination station by performing access control based on CSMA/CA exist adjacent to each other, and in which wireless communication is performed by controlling a CCA threshold considering an interference power value between each BSS that uses the same channel, in which the transmitting station includes a control block determining the CCA threshold value according to the interference power value of the BSS considered as an interference source, calculating a SINR in the destination station according to the interference power value, determining a MCS which is a combination of a modulation scheme and a code rate according to the SINR, and performing the access control based on the CSMA/CA.

公开(公告)号：EP2434665A1

公开(公告)日：2012-03-28

申请号：EP10777559.5

申请日：2010-05-18

申请人： Nippon Telegraph And Telephone Corporation

发明人： ISHIHARA, Koichi ,  KOBAYASHI, Takayuki ,  KUDO, Riichi ,  TAKATORI, Yasushi ,  MATSUI, Munehiro ,  MIZOGUCHI, Masato ,  SANO, Akihide ,  YAMANAKA, Shogo ,  YAMAZAKI, Etsushi ,  MIYAMOTO, Yutaka ,  YOSHIDA, Eiji ,  NAKAGAWA, Tadao

IPC分类号： H04B10/04 ,  H04B10/02 ,  H04B10/06 ,  H04B10/14 ,  H04B10/18 ,  H04B10/26 ,  H04B10/28 ,  H04L7/08

CPC分类号： H04B10/50 ,  H04B10/07951 ,  H04B10/2513 ,  H04B10/556 ,  H04B10/616 ,  H04B10/6161 ,  H04L7/027

摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.

摘要翻译： 基于使用光学信号相干检测使得能够在通信系统中信号的位置检测，频率偏移补偿，时钟偏移补偿，而色散量估计，即使在信号具有大的到达时间偏移依赖于频率由于 色散。 一种光信号发送装置基因率具有功率的特定频带的信号集中在两个或更多个特定频率，并发送一个信号包括特定频带信号。 的光信号接收装置接收到的信号转换成数字信号转换，检测从转换后的数字信号的特定频带信号的位置，估计检测到的特定频带信号的频率位置，并检测频率在光信号接收装置之间的偏移 和光信号发送装置。 更完了，光信号接收装置检测一个时钟光信号接收装置，并从所述特定频带的信号的估计的频率位置之间的间隔的光信号发送装置之间的时间偏移。 进一步地，光信号接收装置估计检测到的特定频带信号的时间位置和色散从特定频带信号对应于不同频率的时间位置之间的差来检测量。

公开(公告)号：EP4243477A2

公开(公告)日：2023-09-13

申请号：EP23188575.7

申请日：2014-05-23

申请人： Nippon Telegraph And Telephone Corporation

发明人： FUKUZONO, Hayato ,  MURAKAMI, Tomoki ,  KUDO, Riichi ,  SHINOHARA, Shoko ,  TAKATORI, Yasushi ,  MIZOGUCHI, Masato

IPC分类号： H04W16/28

摘要： A wireless communication apparatus includes a designation unit which generates format designation information for designating a format of transmission and reception for another wireless communication apparatus, a first transmission unit which wirelessly transmits the format designation information to the other wireless communication apparatus, an acquisition unit which acquires a packet, a propagation channel estimation unit which estimates uplink propagation channel information indicating a propagation channel from the other wireless communication apparatus to the wireless communication apparatus based on the packet, a calibration coefficient calculation unit which calculates a calibration coefficient based on downlink propagation channel information indicating a propagation channel from the wireless communication apparatus to the other wireless communication apparatus and the uplink propagation channel information, a transmission weight value calculation unit which calculates a transmission weight value based on the calibration coefficient and the uplink propagation channel information, and a second transmission unit which wirelessly transmits a predetermined signal to the other wireless communication apparatus based on the transmission weight value.

公开(公告)号：EP3267749B1

公开(公告)日：2020-02-05

申请号：EP16761688.7

申请日：2016-03-04

申请人： Nippon Telegraph and Telephone Corporation

发明人： SHINOHARA, Shoko ,  INOUE, Yasuhiko ,  TAKATORI, Yasushi ,  ISHIHARA, Koichi ,  ASAI, Yusuke ,  MIZOGUCHI, Masato

IPC分类号： H04W72/04 ,  H04W84/12

公开(公告)号：EP3422759A1

公开(公告)日：2019-01-02

申请号：EP17756617.1

申请日：2017-02-23

申请人： Nippon Telegraph And Telephone Corporation

发明人： INOKI, Akiyoshi ,  ABEYSEKERA, Hirantha ,  MATSUI, Munehiro ,  ICHIKAWA, Takeo ,  MIZOGUCHI, Masato ,  KISHIDA, Akira ,  KOIZUMI, Daisuke ,  YAMADA, Akira ,  MORIHIRO, Yoshifumi ,  ASAI, Takahiro

IPC分类号： H04W24/06 ,  H04W24/08 ,  H04W74/08 ,  H04W84/12

摘要： Provided is a wireless environment evaluation method including a step 1 acquiring a transmission and reception history of wireless signals transmitted and received between the plurality of wireless stations and acquiring or estimating a number of wireless stations in transmission standby, based on the transmission and reception history; a step 2 calculating a normal reception rate S in a congesting situation in reception according to the number of wireless stations in transmission standby; a step 3 acquiring a normal reception rate S' of the wireless signals per a fixed channel use time from the transmission and reception history in the prescribed wireless station; and a step 4 determining a degree of the exposed situation in reception according to a ratio of the normal reception rate S' to the normal reception rate S.

公开(公告)号：EP3264805A1

公开(公告)日：2018-01-03

申请号：EP16755468.2

申请日：2016-02-23

申请人： Nippon Telegraph and Telephone Corporation

发明人： KUDO, Riichi ,  ABEYSEKERA, Hirantha Sithira ,  TAKATORI, Yasushi ,  ICHIKAWA, Takeo ,  MIZOGUCHI, Masato ,  MORIOKA, Yasufumi ,  YASUDA, Hiroto ,  YAMADA, Akira ,  MORIHIRO, Yoshifumi ,  OKUMURA, Yukihiko

IPC分类号： H04W4/00 ,  H04W16/14 ,  H04W72/04 ,  H04W84/12 ,  H04W92/20

CPC分类号： H04W74/0833 ,  H04W4/00 ,  H04W16/14 ,  H04W72/04 ,  H04W72/0406 ,  H04W72/044 ,  H04W84/12 ,  H04W92/20

摘要： A wireless user equipment performing wireless communication in a primary and a secondary frequency bands, a first wireless access point AP performing the wireless communication in the primary frequency band, and a second wireless base transceiver station BTS performing the wireless communication in the secondary frequency band are included. The AP and the BTS are connected to each other through a network. A UD report transfer unit transfers a UD report including information relating to transmission-waiting user data destined for a receiving node. The receiving node includes a transmission opportunity control unit which sets a fixed transmission prohibition time in a channel in the primary frequency band for a wireless communication device in a vicinity, obtains a transmission opportunity, grants the transmission opportunity to the transmitting node, and causes the user data to be transmitted from the transmitting node according to the transferred UD report.

摘要翻译： 在主频带和次频带中执行无线通信的无线用户设备，在主频带中执行无线通信的第一无线接入点AP以及在次频带中执行无线通信的第二无线基站收发器BTS是 包括在内。 AP和BTS通过网络相互连接。 UD报告传送单元传送包括与指定给接收节点的发送等待用户数据有关的信息的UD报告。 接收节点包括传输机会控制单元，该传输机会控制单元在用于附近的无线通信设备的主频带的信道中设置固定的传输禁止时间，获得传输机会，将传输机会授予发送节点， 根据传送的UD报告从发送节点发送的用户数据。

公开(公告)号：EP4373003A2

公开(公告)日：2024-05-22

申请号：EP24167485.2

申请日：2016-02-23

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： SHINOHARA, Shoko ,  INOUE, Yasuhiko ,  KISHIDA, Akira ,  KUDO, Riichi ,  MIZOGUCHI, Masato

IPC分类号： H04B7/0452

CPC分类号： H04W72/12 ,  H04W84/12 ,  H04B7/0452 ,  H04W74/002 ,  H04W74/0816

摘要： A wireless LAN access point, AP, to which a plurality of wireless LAN stations, STAs, are connected and a wireless frame is simultaneously transmitted from each of the plurality of STAs to the AP in a multiple access schemes, comprises a station information collection unit configured to collect from the plurality of STAs station information which is used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission, said station information collection unit being configured to collect propagation characteristic information of the STA as the station information; a simultaneous transmission determination unit configured to select a combination of STAs performing the simultaneous transmission based on the station information, a trigger transmission unit configured to transmit to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission, a first CSMA/CA control unit that acquires a channel access right for transmitting a downlink data frame from the AP to each of the STAs, a second CSMA/CA control unit that acquires a channel access right for transmitting the trigger frame, and an access control unit that sets a parameter of CSMA/CA control performing priority control between the CSMA/CA control on the downlink data frame and the CSMA/CA control on the trigger frame.

公开(公告)号：EP4247110A3

公开(公告)日：2023-11-22

申请号：EP23190528.2

申请日：2016-08-15

申请人： Nippon Telegraph And Telephone Corporation

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

IPC分类号： H04W74/08 ,  H04W72/12 ,  H04W74/04 ,  H04W84/12

摘要： 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.