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公开(公告)号：US20160294499A1
公开(公告)日：2016-10-06
申请号：US15182523
申请日：2016-06-14
Inventor： Yoshihiko Ogawa , Daichi Imamura , Sadaki Futagi , Tomofumi Takata
CPC classification number: H04J11/005 , H04B1/38 , H04J13/0062 , H04J13/22 , H04L5/0048 , H04L5/0073 , H04L27/2602 , H04L43/16 , H04W16/10 , H04W72/042
Abstract: Provided is a sequence allocation method capable of reducing inter-cell interference of a reference signal when a ZC sequence is used as the reference signal in a mobile communication system. In the sequence allocation method, R×M sequences specified by a ZC sequence number r (r=1 to R) and a cyclic shift sequence number m (m=1 to M) are divided into a plurality of sequence groups X (X=1 to R) in accordance with the transmission band width of the reference signal, so that the ZC sequence is allocated to each cell in each sequence group unit. When it is assumed that R=9 and M=6, the number of sequences is 54. Each of the sequence groups is formed by two sequences. Accordingly, the number of sequence groups is 27. The 27 types of sequence groups are allocated to each cell.
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12.发明授权Integrated circuit for transmitting and receiving reference signal in radio communication 有权用于在无线电通信中发送和接收参考信号的集成电路公开(公告)号：US09167589B2
公开(公告)日：2015-10-20
申请号：US14699890
申请日：2015-04-29
Inventor： Tomofumi Takata , Daichi Imamura , Seigo Nakao , Sadaki Futagi , Takashi Iwai , Yoshihiko Ogawa
CPC classification number: H04L5/0048 , H04B7/0632 , H04J11/00 , H04J13/0003 , H04J13/0055 , H04J13/0059 , H04J13/0074 , H04J13/10 , H04L5/0007 , H04L5/0057 , H04L25/0204 , H04L25/0208 , H04L25/0228 , H04L27/2695 , H04W72/0413 , H04W72/0446 , H04W72/082 , H04W88/02
Abstract: It is possible to provide a radio communication terminal device and a radio transmission method which can improve reception performance of a CQI and a reference signal. A phase table storage unit stores a phase table which correlates the amount of cyclic shift to complex coefficients {w1, w2} to be multiplied on the reference signal. A complex coefficient multiplication unit reads out a complex coefficient corresponding to the amount of cyclic shift indicated by resource allocation information, from the phase table storage unit and multiplies the read-out complex coefficient on the reference signal so as to change the phase relationship between the reference signals in a slot.
Abstract translation: 可以提供可以提高CQI的接收性能和参考信号的无线通信终端装置和无线发送方法。 相位表存储单元存储将循环移位量与要参考信号相乘的复系数{w1，w2}相关联的相位表。 复系数乘法单元从相位表存储单元读出与由资源分配信息指示的循环移位量相对应的复数系数，并将读出的复数系数与参考信号相乘，以便改变相关关系 参考信号在一个插槽。
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公开(公告)号：US20140286272A1
公开(公告)日：2014-09-25
申请号：US14299814
申请日：2014-06-09
Inventor： Yoshihiko OGAWA , Daichi Imamura , Kenichi Miyoshi , Takashi Iwai , Tomofumi Takata
CPC classification number: H04L25/0258 , H04J13/0062 , H04J13/10 , H04L7/007 , H04L7/042 , H04W72/042
Abstract: Provided is a cyclic shift sequence generation method which can prevent coming of an interference wave into a desired wave detection window even if a cyclic shift sequence has a high mutual correlation in different bandwidths, thereby improving a channel estimation accuracy in a base station. In this method, a cyclic shift sequence number to be allocated to a cell is decided in advance. Moreover, when the cyclic shift amount between cyclic shift sequences allocated in cells is Δ1 and the cyclic shift amount of the cyclic shift sequences allocated between the cells is Δ2, Δ1 and Δ2 are made different when generating a cyclic shift sequence.
Abstract translation: 提供了一种循环移位序列生成方法，即使循环移位序列在不同带宽中具有高相互关系，也能够防止干扰波进入期望的波检测窗口，从而提高基站中的信道估计精度。 在该方法中，预先决定分配给单元的循环移位序列号。 此外，当在单元中分配的循环移位序列之间的循环移位量为＆Dgr1，并且在单元之间分配的循环移位序列的循环移位量为＆Dgr; 2，＆Dgr; 1和＆Dgr; 2在生成 循环移位序列。
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公开(公告)号：US12294542B2
公开(公告)日：2025-05-06
申请号：US17769296
申请日：2020-09-04
Inventor： Takayuki Nakano , Hiroyuki Kanaya , Yoshio Urabe , Ryutaro Hashi , Jun Minotani , Takashi Iwai , Tomofumi Takata
Abstract: This wireless communication control device is a first wireless control device provided with: a control circuit that causes the waveform of a reference signal transmitted to a wireless communication device in coordination with a second wireless communication control device to differ, either in the frequency domain or the time domain, from the waveform of a reference signal transmitted to the wireless communication device by the second wireless communication control device; and a transmission circuit that transmits the reference signal.
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公开(公告)号：US12212509B2
公开(公告)日：2025-01-28
申请号：US18654764
申请日：2024-05-03
Inventor： Takashi Iwai , Hidetoshi Suzuki , Quan Kuang , Tomofumi Takata
IPC: H04L5/00
Abstract: Provided is a terminal which appropriately transmits and receives signals when operating in an unlicensed band. A terminal (200) is provided with: a mapping unit (207) for allocating a signal to a resource on the basis of control information indicating allocation of groups among a plurality of groups obtained by grouping a plurality of blocks into which a frequency band has been divided, and allocation of resources in the blocks; and a transmitting unit (209) for transmitting the signal.
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Patent Agency Ranking
公开(公告)号：US12150111B2
公开(公告)日：2024-11-19
申请号：US17627616
申请日：2020-07-10
Inventor： Takashi Iwai , Tomofumi Takata , Yoshio Urabe , Takayuki Nakano , Jun Minotani
IPC: H04W72/121 , H04W72/0453 , H04W72/1263 , H04W72/23
Abstract: The present invention enables more efficient control of Multi-AP coordination. A base station, according to the present invention, comprises: a control circuit that generates shared information that is shared among a plurality of users and includes information pertaining to unassigned resources, and individual user information specific to each of the plurality of users; and a transmission circuit that transmits a control signal comprising the shared information and the individual user information.
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公开(公告)号：US12108373B2
公开(公告)日：2024-10-01
申请号：US18330118
申请日：2023-06-06
Inventor： Takashi Iwai , Daichi Imamura , Tomofumi Takata , Yoshihiko Ogawa
IPC: H04W72/0446 , H04J13/00 , H04J13/22 , H04W72/044 , H04W72/0453
CPC classification number: H04W72/0446 , H04J13/0055 , H04J13/0062 , H04J13/22 , H04W72/0453 , H04W72/0466
Abstract: It is an object to provide a sequence allocating method that, while maintaining the number of Zadoff-Chu sequences to compose a sequence group, is configured to make it possible to reduce correlations between different sequential groups. This method comprises the steps of setting a standard sequence with a standard sequence length and a standard sequence number in a step, setting a threshold value in accordance with an RB number in a step, setting a sequence length corresponding to RB number in a step, judging whether ¦r/N−rb/Nb¦=Xth(m) is satisfied in a step, including a plurality of Zadoff-Chu sequences with a sequence number and a sequence length in a sequence group in a step if the judgment is positive, and allocating the sequence group to the same cell in a step.
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公开(公告)号：US12004155B2
公开(公告)日：2024-06-04
申请号：US17421351
申请日：2019-09-12
Inventor： Shotaro Maki , Takashi Iwai , Tomofumi Takata
IPC: H04W72/1268 , H04L1/00 , H04W72/0453 , H04W72/20
CPC classification number: H04W72/1268 , H04L1/0051 , H04W72/0453 , H04W72/20
Abstract: Provided is a mobile station that can appropriately allocate resources in an unlicensed band. In the mobile station (200), on the basis of resource association between an uplink reference signal and another uplink signal different from the reference signal, a control unit (205) determines a frequency resource to be used for uplink transmission. A transmission unit (209) uses the frequency resource to transmit at least one of the reference signal and the other uplink signal.
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公开(公告)号：US11570821B2
公开(公告)日：2023-01-31
申请号：US17254360
申请日：2018-06-29
Inventor： Tomofumi Takata , Takashi Iwai , Lilei Wang , Hidetoshi Suzuki , Tetsuya Yamamoto
Abstract: In a terminal (200), a radio transmitter (209) transmits a signal, and a controller (204) determines an allocation resource to which a signal is assigned in a predetermined frequency band. The predetermined frequency band herein is divided into a plurality of bands, and each of the plurality of bands includes a plurality of frequency resources which are base units of resource allocation for the signal. Furthermore, the allocation resource to which the signal is assigned is composed of at least one of the base units of each of the plurality of bands. Furthermore, a configuration method of the at least one of the base units forming the allocation resource is different for each of the plurality of bands.
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公开(公告)号：US11553437B2
公开(公告)日：2023-01-10
申请号：US17049433
申请日：2019-04-05
Inventor： Takashi Iwai , Hidetoshi Suzuki , Tetsuya Yamamoto , Tomoya Nunome , Tomofumi Takata
Abstract: Provided is a terminal which can suitably transmit an uplink signal. In a terminal (100), a PC parameter control unit (104) sets a first power control parameter corresponding to a first service, when a prescribed condition relating to a control channel used for transmission of uplink signal allocation is met, and sets a second power control parameter corresponding to a second service, when the prescribed condition is not met. A transmission unit (109) transmits the uplink signal by using transmission power calculated by using the first power control parameter or the second power control parameter.
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