公开(公告)号：US20190356421A1

公开(公告)日：2019-11-21

申请号：US16531146

申请日：2019-08-05

Applicant: Sony Corporation

Inventor： Yuichi MORIOKA

IPC: H04L1/08 ,  H04L5/00 ,  H04L1/02 ,  H04L27/26

Abstract: A communications system including an infrastructure equipment, forming part of a mobile communications network, that transmits and receives data to/from a user device via a wireless access interface using a plurality of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers that extend across a first bandwidth. The infrastructure equipment is configured to transmit repeatedly signals representing a same instance of user device payload data in a second bandwidth less than and within a first bandwidth, and includes a subset of the OFDM subcarriers. The user device is configured to receive one or more of the signals repeatedly transmitted across the second bandwidth, to store in a memory signals representing the repeatedly transmitted signals received across the second bandwidth and to combine the stored signals, and to detect the user device payload data from the combined signals, the user device having been provided with an indication of the second bandwidth.

公开(公告)号：US20190306696A1

公开(公告)日：2019-10-03

申请号：US16447640

申请日：2019-06-20

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Yong Yang ,  Roland Gustafsson ,  Gunnar Rydnell

IPC: H04W8/12 ,  H04L1/02 ,  H04L5/00 ,  H04W76/28 ,  H04W24/02 ,  H04W76/18 ,  H04L5/02 ,  H04L1/04

Abstract: The embodiments herein relate to a method in a first mobility management node (108a) for handling updated subscriber data associated with a UE (101). The UE (101) is currently unreachable by the first mobility management node (108a). The first mobility management node (108a) receives, from a subscriber database (128), updated subscriber data associated with the UE (101). At least part of the updated subscriber data is modified. The first mobility management node (108a) determines that transmission of the updated subscriber data to a gateway node (110) should be postponed until the UE (101) has become reachable.

公开(公告)号：US10425362B2

公开(公告)日：2019-09-24

申请号：US15594227

申请日：2017-05-12

Applicant: Semtech Corporation

Inventor： Ludovic Champion ,  Olivier Bernard André Seller

IPC: H04L12/939 ,  H04L5/00 ,  H04L29/06 ,  H04B1/69 ,  H04L1/02 ,  H04L1/00 ,  H04W4/70 ,  H04L27/10 ,  H04L27/00

Abstract: A wireless communication system, comprising one or several nodes (A) equipped by a wireless radio interface that is adapted for transmitting digital messages modulated in the form of a series of frequency chirps, for example, LoRa-modulated radio signals. The message is received simultaneously by several base stations (C, D, E), and a server (S) is arranged for dividing the frames by the diverse stations and recombining a corrected frame for the intended recipient (B) based on error codes. Advantageously, the base stations being adapt their timing error compensation strategy when the error codes indicate a corruption of the message.

公开(公告)号：US10374678B2

公开(公告)日：2019-08-06

申请号：US15752106

申请日：2016-08-12

Applicant: Samsung Electronics Co., Ltd.

Inventor： Keon-Kook Lee ,  Young-Han Nam ,  Tae-Young Kim ,  Jee-Hwan Noh ,  Hyun-Il Yoo ,  Su-Ryong Jeong

IPC: H04L1/02 ,  H04B7/06 ,  H04B7/0417 ,  H04L5/00 ,  H04B7/0413

Abstract: The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transfer rate beyond a 4G communication system such as LTE. A method and an apparatus for transmitting and receiving channel state information are disclosed. The method comprises: a step of transmitting, to a terminal, a signaling message including first information indicating at least one precoding matrix which is applicable to a symbol vector to be transmitted; a step of transmitting, to the terminal, a channel status information-reference signal (CSI-RS) for the terminal; and a step of receiving channel state information including a channel quality indicator (CQI) which is calculated using the selected precoding matrix on the basis of second information from the terminal.

公开(公告)号：USRE47436E1

公开(公告)日：2019-06-11

申请号：US14718917

申请日：2015-05-21

Applicant: Sony Corporation

Inventor： Ryo Sawai

IPC: H04L1/02 ,  H04L7/00 ,  H04B7/00 ,  H04L1/00 ,  H04L1/06

Abstract: In order to transmit a large amount of data in series at a time with a MIMO communication scheme while avoiding deterioration of decoding characteristics due to change over time by a channel matrix, a wireless communication system uses an open-loop type and a closed-loop type of MIMO communication modes in combination and switches to the open-loop MIMO communication mode in response to the information that the amount of data to be transmitted at a time has exceeded a predetermined amount of bits or a predetermined transmission time during data transmission under the closed-loop MIMO communication mode. By discontinuing useless closed-loop MIMO communication and switching to the open-loop MIMO communication mode that is better than Zero-forcing, the decoding characteristics are prevented from simply becoming deteriorated.

公开(公告)号：US10187241B2

公开(公告)日：2019-01-22

申请号：US15958880

申请日：2018-04-20

Applicant: UNIVERSITY OF WASHINGTON

Inventor： Shyamnath Gollakota ,  Joshua R. Smith ,  Aaron N. Parks ,  Angli Liu

IPC: H04L1/02 ,  H04L27/26 ,  H04K3/00 ,  H04B1/40 ,  H04B7/0413

Abstract: Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.

公开(公告)号：US10142076B2

公开(公告)日：2018-11-27

申请号：US13147278

申请日：2010-02-02

Applicant: In Ho Lee ,  Jin Kyu Han ,  Ju Ho Lee ,  Jae Chon Yu

Inventor： In Ho Lee ,  Jin Kyu Han ,  Ju Ho Lee ,  Jae Chon Yu

IPC: H04W72/00 ,  H04B7/00 ,  H04W4/00 ,  H04J3/00 ,  H04L12/28 ,  H04L27/28 ,  H04B7/02 ,  H04L1/02 ,  G01R31/28 ,  G08C25/02 ,  H04L5/00 ,  H04W72/04 ,  H04W72/12

Abstract: In a wireless communication system a control channel is required in order to use limited resources effectively. However, the control channel resource is part of the system overhead, and thus reduces the data channel resource used for data transmission. In the long term evolution (LTE) system based on OFDM, one sub frame the consists of fourteen OFDM symbols wherein a maximum of three OFDM symbols are used for the control channel resource and remaining eleven OFDM symbols are used for the data channel resource. Therefore, the quantity of energy that can be transmitted for the control channel resource is extremely limited compared to the data channel resource. For this reason, the coverage of the control channel becomes less than that &; of the data channel, and even if a user can successfully receive the data channel, reception failure of a control channel sometimes˜results in failure of data recovery. In the present invention, in order to expand the coverage of the control channel to at least the coverage of the data channel, the time resource of the transmission resource wherein the control channel is transmitted is expanded and allocated for sending and receiving the control channel. By way of methods for extending the time resource are provided a method wherein a plurality of sub frames are used to transmit one control channel, and a method wherein a part of a data channel is used for the control channel.

公开(公告)号：US10128919B2

公开(公告)日：2018-11-13

申请号：US15524700

申请日：2015-10-09

Applicant: NTT DOCOMO, INC.

Inventor： Kazuki Takeda ,  Hiroki Harada ,  Satoshi Nagata

IPC: H04L1/02 ,  H04B7/0404 ,  H04L5/00 ,  H04L27/26

Abstract: An object is to enable proper operation of extended carrier aggregation that can allocate at least six component carriers to each user terminal. Provided is a user terminal that communicates with a radio base station that configures a plurality of cell groups each of which including one or more cells. The user terminal includes: a control unit that controls six or more component carriers configured by the radio base station; and a transmitting/receiving unit that receives information on a plurality of component carriers configured by the radio base station and feedbacks ACK/NACK information to one of the component carriers in each cell group.

公开(公告)号：US10116405B2

公开(公告)日：2018-10-30

申请号：US15602586

申请日：2017-05-23

Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.

Inventor： Vaneet Aggarwal ,  Dinesh Bharadia ,  Rittwik Jana ,  Christopher W. Rice ,  Nemmara K. Shankaranarayanan

IPC: H04L1/02 ,  H04J11/00 ,  H04L25/03 ,  H04B7/024 ,  H04L25/02 ,  H04L12/26 ,  H04B1/12 ,  H04L5/14

Abstract: A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made of an interference value based on a group of interference signals received at a receiver from a group of transmitters, wherein the interference value is based on channel gains that are estimated for the group of transmitters, and wherein a portion of the interference is self-interference generated from transmitting and receiving at a same time. One of an analog time domain cancellation, a digital time domain cancellation or both, is performed responsive to a determination that the interference value does not satisfy a threshold range of an analog-to-digital converter of the receiver. Other embodiments are disclosed.

公开(公告)号：US10097310B2

公开(公告)日：2018-10-09

申请号：US14513623

申请日：2014-10-14

Applicant: SK TELECOM CO., LTD. ,  Korea University Research and Business Foundation

Inventor： Young Lak Kim ,  Jin Hyo Park ,  Young Kil Suh ,  Jun Heo

IPC: H04L1/00 ,  G06F11/10 ,  H04L1/02

Abstract: A transmission device includes a data controller to output one or more data frames; a encoder to generate one or more encoded data packets for a first data frame among the one or more data frames; and a transmission controller to determine a transmission time point of each of the one or more encoded data packets, and transmit the one or more encoded data packets to a reception device at the determined transmission time point corresponding to each of the one or more encoded data packets.