公开(公告)号：US20190261403A1

公开(公告)日：2019-08-22

申请号：US16400271

申请日：2019-05-01

Applicant: Sun Patent Trust

Inventor： Atsushi SUMASU ,  Shozo OKASAKA ,  Shinsuke TAKAOKA ,  Seigo NAKAO ,  Daichi IMAMURA

IPC: H04W72/12 ,  H04W72/04 ,  H04L5/00

Abstract: A base station able to maintain backward compatibility with an LTE mobile station while minimizing the amount of increase in uplink scheduling information reception and demodulation/decoding processing in independent uplink/downlink cell data transmission. A wireless communication system includes a cell #1, a cell #2, and an LTE-A mobile station, and supports independent uplink/downlink cell data transmission. The base station of the cell #2 arranges a PDCCH+, which includes uplink scheduling information from the LTE-A mobile station to the base station of the cell #2, in a downlink data region in the downlink connection of the base station of the cell #1.

公开(公告)号：US20190223172A1

公开(公告)日：2019-07-18

申请号：US16366424

申请日：2019-03-27

Applicant: Sun Patent Trust

Inventor： Masayuki HOSHINO ,  Akihiko NISHIO ,  Seigo NAKAO ,  Daichi IMAMURA

IPC: H04W72/04 ,  H04L5/00 ,  H04B7/06 ,  H04B7/0456 ,  H04L1/00 ,  H04L1/06 ,  H04L1/20 ,  H04W72/12 ,  H04L25/02

CPC classification number: H04W72/044 ,  H04B7/0486 ,  H04B7/0626 ,  H04B7/0632 ,  H04L1/0026 ,  H04L1/06 ,  H04L1/1829 ,  H04L1/20 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0051 ,  H04L5/0053 ,  H04L5/006 ,  H04L5/0073 ,  H04L5/0082 ,  H04L5/0094 ,  H04L25/0224 ,  H04W72/0406 ,  H04W72/1215

Abstract: Where first and second reference signals for a first and second communication system, respectively, are transmitted, resources that affect a reception apparatus compatible only with the first communication system can be minimized, and the throughput can be prevented from being deteriorated. As resources for a reference signal CSI-RS for LTE-A, last half symbols in a time direction of a resource unit RB/Sub-frame defined in a frequency-time domain are used, and the CSI-RS is allocated in a position up to the last two symbols or in the last symbol, or the like, of a particular RB/Sub-frame and transmitted when a reference signal 4RS for LTE is transmitted to a reception apparatus in addition to transmitting CSI-RS for LTE-A. The reception apparatus receives CSI-RS allocated in the last half symbol of RB/Sub-frame based on CSI-RS allocation information, measures channel quality by using this CSI-RS, and transmits and reports feedback information.

公开(公告)号：US20190199494A1

公开(公告)日：2019-06-27

申请号：US16287611

申请日：2019-02-27

Applicant: Sun Patent Trust

Inventor： Takashi IWAI ,  Sadaki FUTAGI ,  Tomohumi TAKATA ,  Daichi IMAMURA ,  Yoshihiko OGAWA

IPC: H04L5/00 ,  H04L25/02 ,  H04L27/26

CPC classification number: H04L5/0048 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/03159 ,  H04L27/2613

Abstract: Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal, which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller switches the reference signal formation method of a reference signal generator between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.

公开(公告)号：US20190021077A1

公开(公告)日：2019-01-17

申请号：US16133893

申请日：2018-09-18

Applicant: Sun Patent Trust

Inventor： Masayuki HOSHINO ,  Akihiko NISHIO ,  Seigo NAKAO ,  Daichi IMAMURA

IPC: H04W72/04 ,  H04W72/12 ,  H04B7/0456 ,  H04L25/02 ,  H04L5/00 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06 ,  H04L1/20 ,  H04L1/18

Abstract: Where first and second reference signals for a first and second communication system, respectively, are transmitted, resources that affect a reception apparatus compatible only with the first communication system can be minimized, and the throughput can be prevented from being deteriorated. As resources for a reference signal CSI-RS for LTE-A, last half symbols in a time direction of a resource unit RB/Sub-frame defined in a frequency-time domain are used, and the CSI-RS is allocated in a position up to the last two symbols or in the last symbol, or the like, of a particular RB/Sub-frame and transmitted when a reference signal 4RS for LTE is transmitted to a reception apparatus in addition to transmitting CSI-RS for LTE-A. The reception apparatus receives CSI-RS allocated in the last half symbol of RB/Sub-frame based on CSI-RS allocation information, measures channel quality by using this CSI-RS, and transmits and reports feedback information.

公开(公告)号：US20250039849A1

公开(公告)日：2025-01-30

申请号：US18911090

申请日：2024-10-09

Applicant: SUN PATENT TRUST

Inventor： Masayuki HOSHINO ,  Akihiko NISHIO ,  Seigo NAKAO ,  Daichi IMAMURA ,  Yasuaki YUDA

IPC: H04W72/04 ,  H04B7/06 ,  H04B17/00 ,  H04B17/24 ,  H04L1/00 ,  H04L1/1607 ,  H04L5/00 ,  H04W24/10 ,  H04W72/1268 ,  H04W88/02

Abstract: To suppress concentration of channel quality information requests and reports in a case of discontinuously transmitting reference signals at specific resources in a time domain, and thereby preventing degradation in throughput. A transmission apparatus transmits an instruction of CSI request distributed for each reception apparatus in a subframe concurrently with or earlier than a reference signal CSI-RS to each of reception apparatuses. Each of the reception apparatuses detects the CSI request from the transmission apparatus and calculates CSI from a channel estimation value of CSI-RS received thereafter. Then, the reception apparatus identifies CSI report subframe of the own apparatus from CSI report interval information of a given time interval notified in advance, the subframe in which the CSI request is detected and transmission timing of CSI-RS, and transmits a feedback signal including CSI report value by using PUSCH at the timing of the CSI report subframe.

公开(公告)号：US20240292427A1

公开(公告)日：2024-08-29

申请号：US18659475

申请日：2024-05-09

Applicant: Sun Patent Trust

Inventor： Seigo NAKAO ,  Akihiko NISHIO ,  Daichi IMAMURA ,  Takahisa AOYAMA

IPC: H04W72/23 ,  H04L1/00 ,  H04L5/00 ,  H04W28/06 ,  H04W72/0453

CPC classification number: H04W72/23 ,  H04L1/004 ,  H04L5/001 ,  H04L5/003 ,  H04L5/0046 ,  H04L5/0053 ,  H04L5/0094 ,  H04W28/06 ,  H04L5/0007 ,  H04W72/0453

Abstract: Provided are a radio terminal device, a radio base station device, and a channel signal forming method which can prevent quality degradation of the downlink resource allocation information by reducing the frequency of the zero information addition process to the downlink resource allocation information when executing communication using an uplink unit band and multiple downlink unit bands correlated to the uplink unit band. A base station includes: a PDCCH generation unit which includes the uplink allocation information relating to the uplink unit band only in some of the channel signals formed for each of the downlink unit bands; and a padding unit which adds zero information to the downlink allocation information only in the selected some channel signals having the bandwidth of the corresponding downlink unit band smaller than that of the uplink unit band until the downlink allocation information size becomes equal to the uplink allocation information size.

公开(公告)号：US20240259156A1

公开(公告)日：2024-08-01

申请号：US18630875

申请日：2024-04-09

Applicant: Sun Patent Trust

Inventor： Takashi IWAI ,  Sadaki FUTAGI ,  Tomohumi TAKATA ,  Daichi IMAMURA ,  Yoshihiko OGAWA

IPC: H04L5/00 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

CPC classification number: H04L5/0048 ,  H04L25/0226 ,  H04L27/2613 ,  H04L25/022 ,  H04L25/03159

Abstract: Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal, which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller switches the reference signal formation method of a reference signal generator between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.

公开(公告)号：US20210211969A1

公开(公告)日：2021-07-08

申请号：US17208704

申请日：2021-03-22

Applicant: Sun Patent Trust

Inventor： Yoshihiko OGAWA ,  Seigo NAKAO ,  Akihiko NISHIO ,  Masayuki HOSHINO ,  Daichi IMAMURA ,  Atsushi SUMASU

IPC: H04W48/02 ,  H04B7/0413 ,  H04L1/00 ,  H04L1/18 ,  H04L5/00 ,  H04L1/16 ,  H04W28/04 ,  H04W48/12

Abstract: An integrated circuit includes circuitry, which, in operation, controls transmitting downlink data to a terminal apparatus; receiving a plurality of transport blocks which are transmitted in a same time period using a same frequency band in a spatial multiplexing scheme, wherein a same acknowledgement information (ACK/NACK) relating to an error detection result of the downlink data is scrambled with different scrambling schemes respectively for the plurality of transport blocks and the respectively scrambled ACK/NACK is multiplexed with data on respective ones of the plurality of transport blocks, and channel quality information (CQI) of a downlink channel is multiplexed with the data on only one transport block of the plurality of transport blocks by the terminal apparatus; and extracting the ACK/NACK and the CQI from the received plurality of transport blocks.

公开(公告)号：US20210092722A1

公开(公告)日：2021-03-25

申请号：US17117623

申请日：2020-12-10

Applicant: Sun Patent Trust

Inventor： Masayuki HOSHINO ,  Akihiko NISHIO ,  Seigo NAKAO ,  Daichi IMAMURA

IPC: H04W72/04 ,  H04L1/00 ,  H04L1/06 ,  H04L1/20 ,  H04L5/00 ,  H04L25/02 ,  H04W72/12 ,  H04B7/06 ,  H04B7/0456

Abstract: Where first and second reference signals for a first and second communication system, respectively, are transmitted, resources that affect a reception apparatus compatible only with the first communication system can be minimized, and the throughput can be prevented from being deteriorated. As resources for a reference signal CSI-RS for LTE-A, last half symbols in a time direction of a resource unit RB/Sub-frame defined in a frequency-time domain are used, and the CSI-RS is allocated in a position up to the last two symbols or in the last symbol, or the like, of a particular RB/Sub-frame and transmitted when a reference signal 4RS for LTE is transmitted to a reception apparatus in addition to transmitting CSI-RS for LTE-A. The reception apparatus receives CSI-RS allocated in the last half symbol of RB/Sub-frame based on CSI-RS allocation information, measures channel quality by using this CSI-RS, and transmits and reports feedback information.

公开(公告)号：US20200252935A1

公开(公告)日：2020-08-06

申请号：US16853001

申请日：2020-04-20

Applicant: Sun Patent Trust

Inventor： Yoshihiko OGAWA ,  Seigo NAKAO ,  Daichi IMAMURA ,  Akihiko NISHIO ,  Masayuki HOSHINO ,  Katsuhiko HIRAMATSU ,  Kenichi MIYOSHI ,  Yasuaki YUDA ,  Sadaki FUTAGI ,  Takashi IWAI

IPC: H04W72/04 ,  H04L1/00 ,  H04L5/00 ,  H04L25/02 ,  H04L27/26

Abstract: Disclosed are a wireless communication base station device and a division number determination method that improves the frequency diversity effect while maintaining channel estimation accuracy regardless of the number of divisions in the frequency domain of a transmission signal from a wireless communication terminal device. A determination unit determines the number of divisions in the frequency domain of a transmission signal from a wireless communication terminal device. Here, the determination unit increases the number of divisions in the frequency domain of the transmission signal from the wireless communication terminal device as the number of pilot blocks included in the transmission signal increases. In addition, a scheduling unit schedules allocation to the frequency resources of the divided transmission signal according to the number of divisions determined by the determination unit.