Communication system for determining data transmitting scheme according to channel state
    15.
    发明授权
    Communication system for determining data transmitting scheme according to channel state 有权
    用于根据信道状态确定数据传输方案的通信系统

    公开(公告)号:US09288688B2

    公开(公告)日:2016-03-15

    申请号:US13723752

    申请日:2012-12-21

    Abstract: Disclosed is a data transmission method that may enhance a channel capacity in a wireless channel environment of a frequency band having a high directivity in which a transmission apparatus may form a transmission beam and transmit a training signal while sequentially changing a direction of the formed transmission beam, a reception apparatus may form a reception beam and receive the training signal while sequentially changing a direction of the formed reception beam, and the transmission apparatus may receive a response signal from the reception apparatus with respect to the training signal and determine a data transmission scheme based on the received response signal.

    Abstract translation: 公开了一种数据传输方法,其可以增强具有高方向性的频带的无线信道环境中的信道容量,其中发送装置可以形成发送波束并发送训练信号,同时顺序地改变形成的发送波束的方向 接收装置可以形成接收波束并在顺序地改变形成的接收波束的方向的同时接收训练信号,并且发送装置可以相对于训练信号从接收装置接收响应信号,并且确定数据传输方案 基于所接收的响应信号。

    Method and apparatus for transmitting and receiving signal for cooperative transmission in communication system

    公开(公告)号:US11917669B2

    公开(公告)日:2024-02-27

    申请号:US17511140

    申请日:2021-10-26

    CPC classification number: H04W72/542 H04W72/046

    Abstract: An operation method performed by a terminal in a communication system may include: receiving, from a TRP, a first discovery signal including an identifier of a first transmission beam by using a first reception beam; measuring a first received signal strength of the first discovery signal; receiving, from the TRP, a second discovery signal including an identifier of a second transmission beam by using a second reception beam; measuring a second received signal strength of the second discovery signal; transmitting, to the TRP, first beam pair information including the identifier of the first transmission beam and an identifier of the first reception and the first received signal strength information; and transmitting, to the TRP, second beam pair information including the identifier of the second transmission beam and an identifier of the second reception beam and the second received signal strength information.

    Cell-free massive MIMO transmission method, and apparatus for the same

    公开(公告)号:US11764839B2

    公开(公告)日:2023-09-19

    申请号:US17461633

    申请日:2021-08-30

    CPC classification number: H04B7/0452 H04B17/318 H04L5/0048 H04W72/23

    Abstract: An operation method of a CP may comprise: requesting a status report from each of terminals and receiving the status report; determining switching from basic transmission mode to cell-free massive MIMO transmission mode for at least part of the terminals based on the status reports; instructing the at least part of the terminals and at least one AN to perform cell-free massive MIMO transmission for the at least part of the terminals to configure cell-free massive MIMO transmission mode; determining analog beam(s) and/or digital precoder(s) to be applied by the at least one AN to the at least part of the terminals based on channel qualities between the at least part of the terminals and the at least one AN; and allowing the at least one AN to perform cell-free massive MIMO transmission to the at least part of the terminals using the analog beam(s) and/or digital precoder(s).

    Calibration method for cooperative transmission of cell-free wireless network, and apparatus therefor

    公开(公告)号:US11431422B2

    公开(公告)日:2022-08-30

    申请号:US17511061

    申请日:2021-10-26

    Inventor: Seung Eun Hong

    Abstract: A method for calibration, in a serial fronthaul in which a calibration device and L (L is a natural number equal to or greater than 1) access node(s) (AN(s)) are serially connected, may include: transmitting, by the calibration device, to at least part of the L AN(s), a calibration command message indicating calibration of transmission paths; determining, by the calibration device and the at least part of the L AN(s), time delay values and phase characteristic values of the transmission paths of the at least part of the L AN(s); and transmitting, by the calibration device, to the at least part of the L AN(s), a calibration adjustment message indicating calibration of the transmission paths based on the time delay values and the phase characteristic values of the transmission paths of the at least part of the L AN(s).

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