公开(公告)号：US09948424B2

公开(公告)日：2018-04-17

申请号：US12749367

申请日：2010-03-29

Applicant: Sudhir Ramakrishna

Inventor： Sudhir Ramakrishna

IPC: H04L1/00 ,  H04L5/00

CPC classification number: H04L1/0038 ,  H04L5/0046

Abstract: A base station comprising a transmitter configured to transmit a downlink frame. The downlink frame comprises a resource allocation region, and the resource allocation region comprises a set of resource allocation messages comprising at least one resource allocation message. All or a subset of the resource allocation messages each comprise one or more fields with an indicator, interpreted from a particular field or a combination of some or all of the one or more fields, to indicate a number of resource allocation messages intended for a particular subscriber station in the resource allocation region.

公开(公告)号：US08843129B2

公开(公告)日：2014-09-23

申请号：US12961334

申请日：2010-12-06

Applicant: Ying Li ,  Zhouyue Pi ,  Sudhir Ramakrishna ,  Baowei Ji

Inventor： Ying Li ,  Zhouyue Pi ,  Sudhir Ramakrishna ,  Baowei Ji

IPC: H04W24/00 ,  H04W36/00 ,  H04W84/04

CPC classification number: H04W36/0061 ,  H04W84/045

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08625693B2

公开(公告)日：2014-01-07

申请号：US12912080

申请日：2010-10-26

Applicant: Jiann-An Tsai ,  Zhouyue Pi ,  Sudhir Ramakrishna

Inventor： Jiann-An Tsai ,  Zhouyue Pi ,  Sudhir Ramakrishna

IPC: H04B7/02 ,  H04L27/00 ,  H04M11/00

CPC classification number: H04B7/0617 ,  H04B7/0626 ,  H04L25/0204 ,  H04L25/03343 ,  H04L2025/03808

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20110149891A1

公开(公告)日：2011-06-23

申请号：US12953306

申请日：2010-11-23

Applicant: Sudhir Ramakrishna

Inventor： Sudhir Ramakrishna

IPC: H04W72/04

CPC classification number: H04W72/042 ,  H04L5/0023 ,  H04L5/0094

Abstract: For use in a wireless network, a base station configured to communicate in the wireless network is provided. The base station includes a processor coupled to a transmitter and configured to generate a resource allocation message. The resource allocation message includes a plurality of fixed length fields, one or more primary variable-length fields, and a plurality of secondary variable-length fields. The one or more primary variable-length fields occupy a position in the resource allocation message preceding as many of the fixed length fields as permitted by rules that govern a structure of the resource allocation message. The one or more primary variable-length fields are positioned in the resource allocation message such that when the resource allocation message is partitioned and allocated across a sequence of basic units (BUs), every primary variable-length field appears in a smallest possible sequence of BUs starting from the first BU in the sequence.

Abstract translation: 为了在无线网络中使用，提供了被配置为在无线网络中进行通信的基站。 基站包括耦合到发射机并被配置为生成资源分配消息的处理器。 资源分配消息包括多个固定长度字段，一个或多个主可变长度字段和多个次可变长度字段。 一个或多个主可变长度字段在资源分配消息中占据许多固定长度字段的位置，如由管理资源分配消息的结构的规则允许的那样。 一个或多个主可变长度字段位于资源分配消息中，使得当资源分配消息在一系列基本单元（BU）上被划分和分配时，每个主可变长度字段以最小可能的顺序出现 BU从序列中的第一个BU开始。

公开(公告)号：US20110086651A1

公开(公告)日：2011-04-14

申请号：US12856166

申请日：2010-08-13

Applicant: Ying LI ,  Baowei JI ,  Zhouyue PI ,  Jung Je SON ,  Sudhir Ramakrishna ,  Youngkyo BAEK

Inventor： Ying LI ,  Baowei JI ,  Zhouyue PI ,  Jung Je SON ,  Sudhir Ramakrishna ,  Youngkyo BAEK

IPC: H04B15/00

CPC classification number: H04W28/04 ,  H04W4/06 ,  H04W84/045

Abstract: A method and a Mobile Station (MS), for use in a wireless communication network comprising a plurality of Base Stations (BSs) capable of communicating with a plurality of MSs, wherein at least some of the BSs are Femtocell BSs (FBSs) and at least some of the BSs are Macrocell BSs (MBSs), for mitigating interference are provided. The method includes detecting, by an MS, an interfering Closed Subscriber Group (CSG) FBS that the MS is not authorized to access, and transmitting, by the MS, a request for mitigation of interference.

Abstract translation: 一种用于包括能够与多个MS进行通信的多个基站（BS）的无线通信网络中的方法和移动站（MS），其中至少一些BS是毫微微小区BS（FBS），并且在 至少一些BS是Macrocell BS（MBS），用于减轻干扰。 该方法包括由MS检测MS未被授权访问的干扰封闭用户组（CSG）FBS，以及由MS发送减轻干扰的请求。

公开(公告)号：US20110051676A1

公开(公告)日：2011-03-03

申请号：US12848433

申请日：2010-08-02

Applicant: Kaushik Josiam ,  Qi Wu ,  Heewon Kang ,  Sudhir Ramakrishna ,  Tae Young Kim

Inventor： Kaushik Josiam ,  Qi Wu ,  Heewon Kang ,  Sudhir Ramakrishna ,  Tae Young Kim

IPC: H04W8/00

CPC classification number: H04W72/02 ,  H04W28/18 ,  H04W72/00 ,  H04W88/08

Abstract: A base station for use in a wireless network that communicates with mobile stations according to the IEEE 802.16m standard. The base station transmits unicast data and E-MBS data in the downlink to mobile stations using physical resource units (PRUs) that are partitioned into a plurality of frequency partitions. The base station transmits E-MBS data using a first set of PRUs in at least a first common frequency partition, wherein the first set of PRUs are also used by at least a second base station to transmit E-MBS data. The base station further transmits unicast data using a second set of PRUs, wherein the second set of PRUs are randomized with respect to PRUs used by the at least a second base station to transmit unicast data.

Abstract translation: 一种用于根据IEEE 802.16m标准与移动台进行通信的无线网络中的基站。 基站使用被划分为多个频率分区的物理资源单元（PRU）将下行链路中的单播数据和E-MBS数据发送到移动台。 基站在至少第一公共频率分区中使用第一组PRU发送E-MBS数据，其中第一组PRU也由至少第二基站用于发送E-MBS数据。 基站使用第二组PRU进一步发送单播数据，其中第二组PRU相对于由至少第二基站使用的PRU进行随机化以发送单播数据。

公开(公告)号：US07873055B2

公开(公告)日：2011-01-18

申请号：US11256626

申请日：2005-10-21

Applicant: Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Narasimhaiya Rudrapatna

Inventor： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Narasimhaiya Rudrapatna

IPC: H04L12/28

CPC classification number: H04W72/14 ,  H04W72/042 ,  H04W72/1268

Abstract: The present invention provides a method and an apparatus for wireless communication between a base station and at least two mobile stations in a cellular system. The method comprises sending on a forward link at least one of a first and a second command to the at least two mobile stations that the base station is serving on a reverse link. The method further comprises controlling a transmission in at least one of a first and a second transmission mode of at least one mobile station among the at least two mobile stations on the reverse link based on the at least one of the first and second commands. Each of at least two mobile stations may determine a change of transmission mode between an orthogonal or a non-orthogonal transmission mode on a reverse link based on a message on a forward link. A scheduler at a serving base station may match scheduling or transmission resources to the transmissions on the reverse link. The mobile stations being served may use orthogonal and non-orthogonal transmission modes for the transmissions in a non-overlapping fashion in any combination of time, frequency and spatial domains. By selectively assigning a set of mobile stations to the orthogonal or non-orthogonal modes of transmission, the serving base station may enable fairness across the mobile stations.

Abstract translation: 本发明提供一种用于蜂窝系统中的基站与至少两个移动台之间的无线通信的方法和装置。 所述方法包括：在正向链路上发送第一和第二命令中的至少一个到基站在反向链路上服务的至少两个移动站。 该方法还包括基于第一和第二命令中的至少一个来控​​制反向链路上的至少两个移动站中的至少一个移动站的第一和第二传输模式中的至少一个传输。 至少两个移动站中的每一个可以基于前向链路上的消息来确定反向链路上的正交或非正交传输模式之间的传输模式的改变。 服务基站处的调度器可以将调度或传输资源与反向链路上的传输相匹配。 被服务的移动站可以以时间，频率和空间域的任何组合的非重叠方式使用正交和非正交传输模式用于传输。 通过选择性地将一组移动站分配给正交或非正交传输模式，服务基站可以实现跨越移动台的公平性。

公开(公告)号：US07688708B2

公开(公告)日：2010-03-30

申请号：US11388638

申请日：2006-03-24

Applicant: Shupeng Li ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

Inventor： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

IPC: H04J11/00

CPC classification number: H04L5/0016 ,  H04B1/71072 ,  H04B2001/71077 ,  H04L5/0007 ,  H04L25/0228 ,  H04L25/03076 ,  H04L27/0008 ,  H04L27/2647

Abstract: An improved method is provided for reducing inter-carrier interference in the CDMA subchannels of hybrid OFDMA-CDMA systems. The results of decoding OFDMA tones are used to at least partially cancel interference from CDMA tones. Then, the CDMA tones are decoded. In specific embodiments, control information is obtained by an initial step of decoding the CDMA tones. The control information is used in decoding the OFDMA tones. Then, the decoding of the OFDMA tones and the decoding of the CDMA tones are performed iteratively, such that at least one instance of OFDMA decoding is used to cancel interference from the CDMA tones, and at least one instance of CDMA decoding is used to obtain improved control information for decoding the OFDMA tones.

Abstract translation: 提供了一种用于减少混合OFDMA-CDMA系统的CDMA子信道中的载波间干扰的改进方法。 解码OFDMA音调的结果用于至少部分地消除来自CDMA音调的干扰。 然后，解码CDMA音调。 在具体实施例中，通过解码CDMA音调的初始步骤获得控制信息。 控制信息用于解码OFDMA音调。 然后，迭代地执行OFDMA音调的解码和CDMA音调的解码，使得使用OFDMA解码的至少一个实例来消除来自CDMA音调的干扰，并且使用CDMA解码的至少一个实例来获得 用于解码OFDMA音调的改进的控制信息。

公开(公告)号：US20100040157A1

公开(公告)日：2010-02-18

申请号：US12228806

申请日：2008-08-15

Applicant: Shupeng Li ,  Shirish Nagaraj ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

Inventor： Shupeng Li ,  Shirish Nagaraj ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

IPC: H04L27/28 ,  H04L12/56

CPC classification number: H04L5/06 ,  H04L27/28 ,  H04W28/06 ,  H04W72/1263

Abstract: A method is provided for communicating data belonging to at least one application flow (AF). In one aspect, the method involves mapping the data to payload bits of two or more encoder packets (EPs) such that each said EP carries a payload dedicated to only one AF, and transmitting the EPs concurrently. In a second aspect, the above said mapping is inverted at a receiver.

Abstract translation: 提供了一种用于传送属于至少一个应用流（AF）的数据的方法。 在一个方面，该方法包括将数据映射到两个或更多个编码器分组（EP）的有效载荷比特，使得每个所述EP携带仅专用于一个AF的有效载荷，并同时发送EP。 在第二方面，上述映射在接收机处被反转。

公开(公告)号：US20060274702A1

公开(公告)日：2006-12-07

申请号：US11145559

申请日：2005-06-03

Applicant: Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

Inventor： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

IPC: H04J3/22 ,  H04J3/16 ,  H04Q7/20 ,  H04Q7/24 ,  H04Q7/00 ,  H04B7/216

CPC classification number: H04B7/264 ,  H04L47/14 ,  H04L47/25 ,  H04L47/29 ,  H04W28/22

Abstract: A method is provided for controlling communications between a base station and a mobile device. The method comprises transmitting a pilot signal having at least one transmitted characteristic over a channel. A data rate control signal is received, indicating a variation between the transmitted characteristic and a corresponding actual characteristic of the pilot signal received at a remote location. The data rate control signal is modified based on a coefficient related to the bandwidth of the channel, and a transmission rate is determined based on the modified data rate control signal.