公开(公告)号：US20120190378A1

公开(公告)日：2012-07-26

申请号：US13358386

申请日：2012-01-25

Applicant: Shuangfeng Han ,  Chi-Woo Lim

Inventor： Shuangfeng Han ,  Chi-Woo Lim

IPC: H04W24/00 ,  H04W72/08 ,  H04W40/00

CPC classification number: H04W72/082 ,  H04B7/0639 ,  H04W16/28 ,  H04W28/04 ,  H04W52/244 ,  H04W72/0413 ,  H04W72/0453 ,  H04W84/045

Abstract: A method and apparatus provide interference mitigation in a heterogeneous network using beamforming. In the method, a macro Mobile Station (MS) receives a broadcast message including a Precoding Matrix Index (PMI) set restricted in a macro cell, measures a Signal-to-Interference plus Noise Ratio (SINR) and a channel power from an adjacent femto Base Station (BS) and calculates a PMI, determines whether to request a dedicated frequency resource for a macro MS on the basis of the measured SINR, the channel power from the adjacent femto BS, and the calculated PMI, and requests the dedicated frequency resource for the macro MS from a macro BS.

Abstract translation: 一种方法和装置使用波束形成在异构网络中提供干扰减轻。 在该方法中，宏移动站（MS）接收包括在宏小区中限制的集合的预编码矩阵索引（PMI）的广播消息，测量来自相邻的信元干扰加噪声比（SINR）和信道功率 毫微微基站（BS）并且计算PMI，基于测量的SINR，来自相邻毫微微BS的信道功率和所计算的PMI，确定是否请求用于宏MS的专用频率资源，并请求专用频率 来自宏BS的宏MS的资源。

公开(公告)号：US08874126B2

公开(公告)日：2014-10-28

申请号：US13415730

申请日：2012-03-08

Applicant: Su-Ryong Jeong ,  Sung-Eun Park ,  Hyun-Kyu Yu ,  Chi-Woo Lim ,  Shuangfeng Han

Inventor： Su-Ryong Jeong ,  Sung-Eun Park ,  Hyun-Kyu Yu ,  Chi-Woo Lim ,  Shuangfeng Han

IPC: H04W72/00 ,  H04W48/12 ,  H04W48/20 ,  H04W72/08 ,  H04W72/04

CPC classification number: H04W48/12 ,  H04W48/20 ,  H04W72/042 ,  H04W72/082

Abstract: An apparatus and method for initial ranging in a wireless communication system including a heterogeneous network. An operation of a terminal includes selecting a serving cell considering a biased value of a base station applying range expansion. The operation also includes receiving ranging code classification information and threshold information associated with the serving cell. The operation further includes, if a channel quality with the serving cell is less than the threshold, selecting one a plurality of poor-expected-ranging codes indicated by the ranging code classification information, and performing initial ranging using the selected poor-expected-ranging code.

Abstract translation: 一种用于包括异构网络的无线通信系统中的初始测距的装置和方法。 终端的操作包括考虑基站施加范围扩展的偏置值来选择服务小区。 该操作还包括接收测距码分类信息和与服务小区相关联的阈值信息。 该操作还包括：如果与服务小区的信道质量小于阈值，则选择由测距码分类信息指示的多个不良预期测距码中的一个，并且使用所选择的预期不合格范围进行初始测距 码。

公开(公告)号：US08626071B2

公开(公告)日：2014-01-07

申请号：US13358386

申请日：2012-01-25

Applicant: Shuangfeng Han ,  Chi-Woo Lim

Inventor： Shuangfeng Han ,  Chi-Woo Lim

IPC: H04B1/00

CPC classification number: H04W72/082 ,  H04B7/0639 ,  H04W16/28 ,  H04W28/04 ,  H04W52/244 ,  H04W72/0413 ,  H04W72/0453 ,  H04W84/045

Abstract: A method and apparatus provide interference mitigation in a heterogeneous network using beamforming. In the method, a macro Mobile Station (MS) receives a broadcast message including a Precoding Matrix Index (PMI) set restricted in a macro cell, measures a Signal-to-Interference plus Noise Ratio (SINR) and a channel power from an adjacent femto Base Station (BS) and calculates a PMI, determines whether to request a dedicated frequency resource for a macro MS on the basis of the measured SINR, the channel power from the adjacent femto BS, and the calculated PMI, and requests the dedicated frequency resource for the macro MS from a macro BS.

Abstract translation: 一种方法和装置使用波束形成在异构网络中提供干扰减轻。 在该方法中，宏移动站（MS）接收包括在宏小区中限制的集合的预编码矩阵索引（PMI）的广播消息，测量来自相邻的信元干扰加噪声比（SINR）和信道功率 毫微微基站（BS）并且计算PMI，基于测量的SINR，来自相邻毫微微BS的信道功率和所计算的PMI，确定是否请求用于宏MS的专用频率资源，并请求专用频率 来自宏BS的宏MS的资源。

公开(公告)号：US08542635B2

公开(公告)日：2013-09-24

申请号：US12915814

申请日：2010-10-29

Applicant: Shuangfeng Han ,  Chi-Woo Lim

Inventor： Shuangfeng Han ,  Chi-Woo Lim

IPC: H04W72/04 ,  H04B7/06

CPC classification number: H04B7/024 ,  H04B17/12

Abstract: A calibration apparatus and a calibration method for multicell Multiple Input Multiple Output (MIMO) transmission in a multiple antenna system are provided. More particularly, an operating method of a Mobile Station (MS) for performing calibration for multicell MIMO transmission in a multiple antenna system includes negotiating a multi-Base Station (BS) joint processing with a BS, receiving a control message including information instructing multi-BS calibration for sounding based on the multi-BS joint processing, from the BS; when receiving the control message involving the multi-BS joint processing, generating a second sounding sequence by mapping estimated phases of downlink channels per subcarrier of BSs to a first sounding sequence allocated from the BS, and transmitting the second sounding sequence, including the phases of the downlink channels per subcarrier, over a sounding symbol interval with respect to each of the BSs involving the multi-BS joint processing. Hence, feedback overhead in the calibration of the multicell MIMO transmission can be reduced.

Abstract translation: 提供了一种用于多天线系统中的多输入多输入多输出（MIMO）传输的校准装置和校准方法。 更具体地说，用于在多天线系统中进行多单元MIMO传输的校准的移动台（MS）的操作方法包括：与BS协商多基站（BS）联合处理，接收包括指示多台天线的信息的控制消息， 基于BS的校准基于多BS联合处理，从BS; 当接收到涉及多BS联合处理的控制消息时，通过将BS的每个子载波的下行链路信道的估计相位映射到从BS分配的第一探测序列，并发送第二探测序列，生成第二探测序列， 相对于涉及多BS联合处理的每个BS的探测符号间隔，每个子载波的下行链路信道。 因此，可以减少多单元MIMO传输的校准中的反馈开销。

公开(公告)号：US20120231830A1

公开(公告)日：2012-09-13

申请号：US13415730

申请日：2012-03-08

Applicant: Su-Ryong Jeong ,  Sung-Eun Park ,  Hyun-Kyu Yu ,  Chi-Woo Lim ,  Shuangfeng Han

Inventor： Su-Ryong Jeong ,  Sung-Eun Park ,  Hyun-Kyu Yu ,  Chi-Woo Lim ,  Shuangfeng Han

IPC: H04W72/02 ,  H04W24/02

CPC classification number: H04W48/12 ,  H04W48/20 ,  H04W72/042 ,  H04W72/082

Abstract: An apparatus and method for initial ranging in a wireless communication system including a heterogeneous network. An operation of a terminal includes selecting a serving cell considering a biased value of a base station applying range expansion. The operation also includes receiving ranging code classification information and threshold information associated with the serving cell. The operation further includes, if a channel quality with the serving cell is less than the threshold, selecting one a plurality of poor-expected-ranging codes indicated by the ranging code classification information, and performing initial ranging using the selected poor-expected-ranging code.

Abstract translation: 一种用于包括异构网络的无线通信系统中的初始测距的装置和方法。 终端的操作包括考虑基站施加范围扩展的偏置值来选择服务小区。 该操作还包括接收测距码分类信息和与服务小区相关联的阈值信息。 该操作还包括：如果与服务小区的信道质量小于阈值，则选择由测距码分类信息指示的多个不良预期测距码中的一个，并且使用所选择的预期不合格范围进行初始测距 码。

公开(公告)号：US09001918B2

公开(公告)日：2015-04-07

申请号：US13594370

申请日：2012-08-24

Applicant: Rakesh Taori ,  Shuangfeng Han

Inventor： Rakesh Taori ,  Shuangfeng Han

IPC: H04L27/10 ,  H04L27/26

CPC classification number: H04L27/2634 ,  H04L27/2601 ,  H04L27/2626 ,  H04L27/2646 ,  H04W72/04

Abstract: A communication apparatus and method in a wireless communication system that support multiple Orthogonal Frequency Division Multiplexing (OFDM) parameter sets. A method includes determining a respective OFDM parameter set for each of multiple Radio Frequency (RF) chains; and processing an OFDM signal in each of the multiple RF chains based on a parameter value defined in the respective OFDM parameter set.

Abstract translation: 一种支持多个正交频分复用（OFDM）参数集的无线通信系统中的通信装置和方法。 一种方法包括为多个射频（RF）链中的每一个确定相应的OFDM参数集合; 以及基于在各个OFDM参数集中定义的参数值来处理所述多个RF链中的每一个中的OFDM信号。

公开(公告)号：US20120327872A1

公开(公告)日：2012-12-27

申请号：US13531308

申请日：2012-06-22

Applicant: Shuangfeng Han

Inventor： Shuangfeng Han

IPC: H04W72/02

CPC classification number: H04W72/046 ,  H01Q3/28 ,  H04B7/043 ,  H04B7/0617 ,  H04L1/0006

Abstract: In one embodiment, a method for network entry in a wireless communication system includes acquiring ranging code configuration information, which represents the corresponding relationship among multiple beam vectors, multiple ranging sequences, and multiple ranging channels, determining an optimal downlink beam vector, and transmitting one of the ranging sequences corresponding to the optimal downlink beam vector to a Base Station (BS) through one of the ranging channels corresponding to the optimal downlink beam vector.

Abstract translation: 在一个实施例中，一种用于在无线通信系统中进行网络输入的方法包括获取测距码配置信息，其表示多个波束矢量，多个测距序列和多个测距信道之间的对应关系，确定最佳下行链路波束向量，并发送一个 通过对应于最佳下行链路波束向量的测距信道之一，将与最佳下行链路波束向量相对应的测距序列发送到基站（BS）。

公开(公告)号：US08149933B2

公开(公告)日：2012-04-03

申请号：US12040023

申请日：2008-02-29

Applicant: Shuangfeng Han ,  Seong-Taek Hwang ,  Zhunhui Zhou ,  Jing Wang ,  Ming Zhao ,  Zheng Xu

Inventor： Shuangfeng Han ,  Seong-Taek Hwang ,  Zhunhui Zhou ,  Jing Wang ,  Ming Zhao ,  Zheng Xu

IPC: H04K1/10

CPC classification number: H04L27/2601 ,  H04L5/0023 ,  H04L5/0032 ,  H04L5/0037 ,  H04L5/0062 ,  H04L5/023

Abstract: Disclosed is a method and an apparatus for subchannel assignment for suppressing inter-antenna interference in an Orthogonal Frequency Division Multiplexing Access (OFDMA) system based distributed wireless communication system equipped with antennas that are randomly distributed in a geographical manner and can simultaneously communicate with multiple Subscriber Stations (SSs). The method includes selecting and obtaining access to distributed antennas which satisfy the data transmission rate that an SS requires and with which the SS can communicate; re-queuing a distributed antenna having the maximum transmitted power within the same cell in high priority; and assigning subchannels to the relevant distributed antennas in an order from the relevant distributed antenna having the high priority.

Abstract translation: 公开了一种用于抑制基于正交频分复用接入（OFDMA）系统的分布式无线通信系统中的天线间干扰的方法和装置，所述分布式无线通信系统配备有以地理方式随机分布并可同时与多个用户通信的天线 车站（SS）。 该方法包括：选择和获得满足SS要求的数据传输速率并与SS通信的分布式天线; 将具有最高发送功率的分布式天线重新排队在高优先级的同一小区内; 以及从具有高优先级的相关分布式天线的顺序向相关的分布式天线分配子信道。

公开(公告)号：US20080117961A1

公开(公告)日：2008-05-22

申请号：US11974402

申请日：2007-10-12

Applicant: Shuangfeng Han ,  Seong-Taek Hwang ,  Hoon Kim ,  Sang-Ho Kim ,  Jae-Hun Cho ,  Jae-Hoon Lee ,  Ki-Uk Song

Inventor： Shuangfeng Han ,  Seong-Taek Hwang ,  Hoon Kim ,  Sang-Ho Kim ,  Jae-Hun Cho ,  Jae-Hoon Lee ,  Ki-Uk Song

IPC: H04L27/00

CPC classification number: H04W52/42 ,  H04B7/043 ,  H04B7/0617 ,  H04B7/0691 ,  H04L1/0625 ,  H04L1/0668 ,  H04W52/04

Abstract: Disclosed is an apparatus and method for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system, the apparatus comprising: a plurality of sub-arrays for beamforming, which are geographically distributed and each of which comprises a plurality of distributed antennas placed in random groups; and a central processing unit for identifying performances of subsets by applying a predetermined power allocation scheme according to subsets which can be obtained by combining the sub-arrays, by means of a Nakagami fading parameter and information about large-scale fading of each of the sub-arrays, fed back from a receiving party, for determining a subset having a best performance as an optimal subset according to the identified performances, and for performing power allocation based on the subset set as the optimal subset.

Abstract translation: 公开了一种用于在分布式无线通信系统中自适应地分配与正交空时块码（OSTBC）组合的波束成形的发射功率的装置和方法，该装置包括：多个用于波束成形的子阵列，其在地理上分布并且每个 其中包括放置在随机组中的多个分布式天线; 以及中央处理单元，用于通过应用根据可以通过组合子阵列获得的子集的预定功率分配方案，通过Nakagami衰落参数和关于每个子级的大规模衰落的信息来应用子集的性能 - 从接收方反馈的用于根据所识别的性能确定具有最佳性能的子集作为最佳子集的子阵列，以及用于基于所述子集作为所述最佳子集执行功率分配。

公开(公告)号：US08571121B2

公开(公告)日：2013-10-29

申请号：US12034723

申请日：2008-02-21

Applicant: Shuangfeng Han ,  Seong-Taek Hwang ,  Han-Lim Lee

Inventor： Shuangfeng Han ,  Seong-Taek Hwang ,  Han-Lim Lee

IPC: H04L27/10

CPC classification number: H04L1/20 ,  H04B7/0443 ,  H04L1/0618 ,  Y02D70/444

Abstract: A method for Symbol Error Rate (SER) approximation of an SER-based transmission power allocation operation for an Orthogonal Space Time Block Code in a DWCS equipped with multiple transmission Distributed Antennas (DA) geographically dispersed at random. The method for SER approximation includes the steps of: setting multiple combinable antenna subsets from the multiple DAs; selecting a quasi-optimal antenna subset Ag (1≦g≦2n−1) having a quasi-optimal power allocation weight wg based on predetermined power allocation, for each of the set multiple antenna subsets; and calculating an SER approximation value of the selected quasi-optimal antenna subset by applying a Probability Density Function (PDF) of a Signal-to-Noise Ratio (SNR) to the OSTBC SER having symbol constellation of a predetermined modulation scheme. The output of the SER approximation value can be output to a transmitter, or to a space-time encoder of a central processor for optimal power transmission.

Abstract translation: 一种用于在配备有随机分布的多传输分布式天线（DA）的DWCS中的正交空间时间块码的基于SER的发射功率分配操作的符号误码率（SER）近似方法。 SER近似的方法包括以下步骤：从多个DA设置多个可组合天线子集; 对于所设置的多个天线子集中的每一个，选择具有基于预定功率分配的准最优功率分配权重wg的准最优天线子集Ag（1 @ g @ 2n-1） 以及通过将具有信号噪声比（SNR）的概率密度函数（PDF））应用于具有预定调制方案的符号星座图的OSTBC SER来计算所选择的准最佳天线子集的SER近似值。 SER近似值的输出可以输出到中央处理器的发射机或时空编码器，以实现最佳的功率传输。