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    Reference signal design for cell search in an orthogonal wireless communication system
    1.
    发明授权
    Reference signal design for cell search in an orthogonal wireless communication system 有权

    公开(公告)号：US10212648B2

    公开(公告)日：2019-02-19

    申请号：US15694651

    申请日：2017-09-01

    Applicant: QUALCOMM Incorporated

    Inventor： Juan Montojo ,  Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Tao Luo

    IPC: H04B7/204 ,  H04W48/16 ,  H04J11/00 ,  H04L5/00 ,  H04J3/06 ,  H04W48/08

    Abstract: Systems and methodologies are described that facilitate efficient cell acquisition in a wireless communication system. In one aspect, a reference signal for use in cell acquisition can be constructed in a bandwidth-agnostic manner such that it contains a common central portion in a predetermined frequency band that is independent of a bandwidth utilized by an associated wireless communication system. The central portion can be constructed as a two-dimensional block in time and frequency that spans a default cell search bandwidth, a predetermined bandwidth specified by synchronization codes or other signals, or another suitable bandwidth. A reference signal can then be constructed form the central portion by tiling or expanding the central portion such that it spans the entire system bandwidth.

    UPLINK CHANNEL ESTIMATION USING A SIGNALING CHANNEL
    2.
    发明申请
    UPLINK CHANNEL ESTIMATION USING A SIGNALING CHANNEL 有权
    使用信号通道的上行信道估计

    公开(公告)号：US20150304089A1

    公开(公告)日：2015-10-22

    申请号：US14754033

    申请日：2015-06-29

    Applicant: QUALCOMM Incorporated

    Inventor： Byoung-Hoon Kim ,  Durga Prasad Malladi ,  Hao Xu

    IPC: H04L5/00 ,  H04B7/06 ,  H04B7/04 ,  H04W52/32 ,  H04W72/04

    CPC classification number: H04L5/0057 ,  H04B7/0413 ,  H04B7/0632 ,  H04B2201/70701 ,  H04L1/0002 ,  H04L1/02 ,  H04L1/06 ,  H04L5/023 ,  H04L25/0224 ,  H04L25/023 ,  H04L27/261 ,  H04W52/325 ,  H04W72/042

    Abstract: Techniques for efficiently deriving uplink channel estimates without consuming much additional uplink resources are described. A user equipment (UE) may send a request for uplink resources on a request channel (REQCH) whenever the UE desires to transmit data on the uplink. The UE may send the REQCH on a set of subcarriers and from multiple antennas, e.g., send REQCH data on data subcarriers and pilot on pilot subcarriers. A Node B may receive the request, estimate the complex channel gains for the pilot subcarriers based on received pilot symbols, and coherently demodulate received data symbols based on the channel gain estimates. The Node B may estimate the complex channel gains for the data subcarriers based on demodulated data symbols and derive a channel estimate for each UE antenna based on the channel gain estimates for the pilot and data subcarriers. The Node B may use the channel estimates for MIMO scheduling, subband scheduling, and rate selection.

    Abstract translation: 描述了在不消耗大量附加上行链路资源的情况下有效地导出上行链路信道估计的技术。 每当UE希望在上行链路上发送数据时，用户设备（UE）可以在请求信道（REQCH）上发送上行链路资源的请求。 UE可以在一组子载波上从多个天线发送REQCH，例如在数据子载波上发送REQCH数据，并在导频子载波上导频。 节点B可以接收该请求，基于接收到的导频符号估计导频子载波的复信道增益，并且基于信道增益估计来相干地解调所接收的数据符号。 节点B可以基于解调的数据符号来估计数据子载波的复信道增益，并且基于导频和数据子载波的信道增益估计导出每个UE天线的信道估计。 节点B可以使用用于MIMO调度，子带调度和速率选择的信道估计。

    Beacon assisted cell search in a wireless communication system
    8.
    发明授权
    Beacon assisted cell search in a wireless communication system 有权
    信标在无线通信系统中辅助小区搜索

    公开(公告)号：US09398552B2

    公开(公告)日：2016-07-19

    申请号：US14158037

    申请日：2014-01-17

    Applicant: QUALCOMM INCORPORATED

    Inventor： Durga Prasad Malladi ,  Juan Montojo ,  Junyi Li ,  Byoung-Hoon Kim

    IPC: H04W56/00 ,  H04L5/00 ,  H04B1/713 ,  H04J11/00 ,  H04W48/16 ,  H04L27/26 ,  H04W48/12

    CPC classification number: H04W56/001 ,  H04B1/713 ,  H04J11/0069 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/0064 ,  H04L27/2656 ,  H04W48/12 ,  H04W48/16

    Abstract: Techniques for transmitting synchronization signals to assist user equipments (UEs) perform cell searches are described. In one design, a base station for a cell may generate and transmit a primary synchronization signal and a secondary synchronization signal, which may be used by the UEs for initial cell search at power up. The base station may also generate and transmit one or more beacon signals, which may be used by the UEs for neighbor cell search to detect for neighbor cells. The number of beacon signals to transmit and the set of subcarriers usable for each beacon signal may be determined based on the system bandwidth. Each beacon signal may be mapped to one subcarrier in the set of subcarriers in each beacon symbol period. This one subcarrier may be determined based on a beacon hopping pattern or a beacon code and may be dependent on a cell identifier (ID).

    Abstract translation: 描述用于发送同步信号以辅助用户设备（UE）执行小区搜索的技术。 在一种设计中，用于小区的基站可以生成并发送主同步信号和辅同步信号，UE可以在加电时用于初始小区搜索。 基站还可以生成和发送一个或多个信标信号，其可以由UE用于相邻小区搜索以检测相邻小区。 可以基于系统带宽来确定要发送的信标信号的数量和可用于每个信标信号的子载波的集合。 每个信标信号可以被映射到每个信标符号周期中的子载波集合中的一个子载波。 可以基于信标跳变模式或信标代码来确定该一个子载波，并且可以依赖于小区标识符（ID）。

    System and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
    9.
    发明授权
    System and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates 有权
    用于减少上行链路资源以提供用于调整下行链路MIMO信道数据速率的信道性能反馈的系统和方法

    公开(公告)号：US09178584B2

    公开(公告)日：2015-11-03

    申请号：US14221122

    申请日：2014-03-20

    Applicant: QUALCOMM Incorporated

    Inventor： Byoung-Hoon Kim

    IPC: H04B1/00 ,  H04B7/04 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06

    CPC classification number: H04B7/0417 ,  H04B7/04 ,  H04B7/0632 ,  H04L1/0026 ,  H04L1/06 ,  H04L1/0656 ,  H04L1/0675

    Abstract: Systems and methods for improving the performance of a MIMO wireless communication system by reducing the amount of uplink resources that are needed to provide channel performance feedback for the adjustment of data rates on the downlink MIMO channels. In one embodiment, a method comprises encoding each of a set of data streams according to corresponding data rates, permuting the data streams on a set of MIMO channels according to a full permutation of combinations, transmitting the permuted data streams, receiving the permuted data streams, decoding and determining an SNR for each of the data streams, computing a condensed SNR metric for the set of data streams, providing the condensed metric as feedback, determining a set of individual SNR metrics for the data streams based on the condensed SNR metric, and adjusting the data rates at which the data streams are encoded based on the individual SNR metrics.

    Abstract translation: 通过减少为在下行链路MIMO信道上调整数据速率而提供信道性能反馈所需的上行链路资源的量来改善MIMO无线通信系统的性能的系统和方法。 在一个实施例中，一种方法包括根据对应的数据速率对一组数据流中的每一个进行编码，根据组合的全部排列来置换一组MIMO信道上的数据流，发送置换的数据流，接收置换的数据流 解码和确定每个数据流的SNR，计算所述数据流集合的精简SNR度量，提供所述精简度量作为反馈，基于所述精简SNR度量确定所述数据流的各个SNR度量的集合， 以及基于各个SNR度量来调整数据流被编码的数据速率。

    BEACON ASSISTED CELL SEARCH IN A WIRELESS COMMUNICATION SYSTEM
    10.
    发明申请
    BEACON ASSISTED CELL SEARCH IN A WIRELESS COMMUNICATION SYSTEM 有权
    无线通信系统中的信号辅助小区搜索

    公开(公告)号：US20140133478A1

    公开(公告)日：2014-05-15

    申请号：US14158037

    申请日：2014-01-17

    Applicant: QUALCOMM INCORPORATED

    Inventor： Durga Prasad Malladi ,  Juan Montojo ,  Junyi Li ,  Byoung-Hoon Kim

    IPC: H04W56/00

    CPC classification number: H04W56/001 ,  H04B1/713 ,  H04J11/0069 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/0064 ,  H04L27/2656 ,  H04W48/12 ,  H04W48/16

    Abstract: Techniques for transmitting synchronization signals to assist user equipments (UEs) perform cell searches are described. In one design, a base station for a cell may generate and transmit a primary synchronization signal and a secondary synchronization signal, which may be used by the UEs for initial cell search at power up. The base station may also generate and transmit one or more beacon signals, which may be used by the UEs for neighbor cell search to detect for neighbor cells. The number of beacon signals to transmit and the set of subcarriers usable for each beacon signal may be determined based on the system bandwidth. Each beacon signal may be mapped to one subcarrier in the set of subcarriers in each beacon symbol period. This one subcarrier may be determined based on a beacon hopping pattern or a beacon code and may be dependent on a cell identifier (ID).

    Abstract translation: 描述用于发送同步信号以辅助用户设备（UE）执行小区搜索的技术。 在一种设计中，用于小区的基站可以生成并发送主同步信号和辅同步信号，UE可以在加电时用于初始小区搜索。 基站还可以生成和发送一个或多个信标信号，其可以由UE用于相邻小区搜索以检测相邻小区。 可以基于系统带宽来确定要发送的信标信号的数量和可用于每个信标信号的子载波的集合。 每个信标信号可以被映射到每个信标符号周期中的子载波集合中的一个子载波。 可以基于信标跳变模式或信标代码来确定该一个子载波，并且可以依赖于小区标识符（ID）。

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