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    • 3. 发明授权
    • Methods and apparatus to support base station detection and selection in multi-tier wireless networks
    • 支持多层无线网络中基站检测和选择的方法和装置
    • US08843129B2
    • 2014-09-23
    • US12961334
    • 2010-12-06
    • Ying LiZhouyue PiSudhir RamakrishnaBaowei Ji
    • Ying LiZhouyue PiSudhir RamakrishnaBaowei Ji
    • H04W24/00H04W36/00H04W84/04
    • H04W36/0061H04W84/045
    • A subscriber station can efficiently determine an accessible base station by scanning a subset of base stations based on an optimized list received from a serving base station. The subscriber station includes a white list that contains information regarding a number of closed subscriber group (CSG) base stations to which the subscriber station is subscribed. The subscriber station can transmit a request message that includes one or more of: indication of whether the detected identifier of the femto base station is in the whitelist or not; and its location information. In response, the base station can send a message that includes the nearby femtocells and whether the femtocell is accessible or inaccessible to the subscriber station. The femto base station can be designed to be in transmission off mode when none of its subscribers is in its coverage. The serving base station can select a set of the accessible femtocells to the subscriber station, and request the selected femtocells to monitor an uplink signaling of the subscriber station so that the femtocell can be awaken when the femtocell is in transmission off mode or be aware that the subscriber station is in proximity, if the uplink signaling is detected.
    • 用户站可以基于从服务基站接收到的优化列表来扫描基站的子集,来有效地确定可访问的基站。 用户站包括白名单,其包含关于用户台订阅的封闭用户组(CSG)基站的数量的信息。 用户台可以发送包括以下中的一个或多个的请求消息:毫微微基站的检测到的标识符是否在白名单中的指示; 及其位置信息。 作为响应,基站可以发送包括附近的毫微微小区的消息以及毫微微小区是否可访问或用户台不可访问。 当毫微微基站的用户没有覆盖时,毫微微基站可以被设计为处于传输关闭模式。 服务基站可以向用户台选择一组可访问的毫微微小区,并且请求所选择的毫微微小区监视用户站的上行链路信令,以便当毫微微小区处于传输关闭模式时可以唤醒毫微微小区,或者意识到 如果检测到上行链路信令,则用户站处于接近状态。
    • 4. 发明授权
    • Techniques for transformation codebook antenna beamforming in OFDM wireless communication system
    • OFDM无线通信系统中变换码本天线波束成形技术
    • US08625693B2
    • 2014-01-07
    • US12912080
    • 2010-10-26
    • Jiann-An TsaiZhouyue PiSudhir Ramakrishna
    • Jiann-An TsaiZhouyue PiSudhir Ramakrishna
    • H04B7/02H04L27/00H04M11/00
    • H04B7/0617H04B7/0626H04L25/0204H04L25/03343H04L2025/03808
    • Methods for a transmitter station and a receiver station to perform beamforming in a wireless communication system, and a transmitter station and a receiver station to perform the corresponding method, are provided. The method for the transmitter station to perform beamforming in the wireless communication system includes estimating and tracking a long-term averaged and normalized channel correlation matrix between the transmitter station and a receiver station, determining beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix, and communicating with the receiver station using the determined beamforming coefficients, wherein the receiver station also estimates and tracks the long term averaged and normalized channel correlation matrix, and determines beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix.
    • 发送站和接收站在无线通信系统中执行波束成形的方法以及发送站和接收站来执行相应的方法。 发射机站在无线通信系统中执行波束成形的方法包括估计和跟踪发射机站和接收机站之间的长期平均和归一化的信道相关矩阵,基于被跟踪的长期平均和归一化的波长成形系数 信道相关矩阵,并且使用所确定的波束形成系数与接收机站进行通信,其中接收机站还估计和跟踪长期平均和归一化的信道相关矩阵,并且基于跟踪的长期平均和归一化信道相关性来确定波束成形系数 矩阵。
    • 9. 发明申请
    • METHOD AND APPARATUS FOR BEAM BROADENING FOR PHASED ANTENNA ARRAYS USING MULTI-BEAM SUB-ARRAYS
    • 使用多束子阵列的波束天线阵列的波束扩展方法和装置
    • US20130057432A1
    • 2013-03-07
    • US13558208
    • 2012-07-25
    • Sridhar RajagopalKaushik JosiamZhouyue Pi
    • Sridhar RajagopalKaushik JosiamZhouyue Pi
    • H01Q3/24
    • H01Q3/26H01Q25/002
    • A transmitter or receiver may use beamforming methods for transmitting or receiving a signal in a communication system. The method for transmitting includes determining a first beamforming weight associated with a total number of antennas in an antenna array. The method also includes transmitting a first signal in a first beam having a first beam width using the total number of antennas by applying the first predetermined beamforming weight. The method further includes determining a second beamforming weight associated with a first sub-array of antennas in the antenna array and determining a third beamforming weight associated with a second sub-array of antennas in the antenna array. The method still further includes transmitting a second signal in a second beam having a second beam width using the first sub-array of antennas by applying the second beamforming weight and the second sub-array of antennas by applying the third beamforming weight.
    • 发射机或接收机可以使用波束成形方法在通信系统中发送或接收信号。 用于发送的方法包括确定与天线阵列中的天线总数相关联的第一波束成形权重。 该方法还包括通过应用第一预定波束形成权重,使用总天线数量在具有第一波束宽度的第一波束中发送第一信号。 该方法还包括确定与天线阵列中的天线的第一子阵列相关联的第二波束成形权重,并且确定与天线阵列中的天线的第二子阵列相关联的第三波束成形权重。 该方法还包括:通过应用第三波束形成权重应用第二波束形成权重和第二子阵列天线,使用第一天线子阵列在具有第二波束宽度的第二波束中发送第二信号。