公开(公告)号：US20110103395A1

公开(公告)日：2011-05-05

申请号：US12611778

申请日：2009-11-03

Applicant: Niranjan N. Ratnakar ,  Ritesh K. Madan ,  Sundeep Rangan

Inventor： Niranjan N. Ratnakar ,  Ritesh K. Madan ,  Sundeep Rangan

IPC: H04L12/56

CPC classification number: H04L47/6215 ,  H04L47/50 ,  H04L47/568 ,  H04L49/90

Abstract: A communications method is provided. The method includes processing multiple packet queues for a high speed packet data network and associating one or more arrays for the multiple packet queues. The method also includes generating an index for the arrays, where the index is associated with a time stamp in order to determine a burst size for the high speed packet data network.

Abstract translation: 提供通信方法。 该方法包括处理高速分组数据网络的多个分组队列并且将多个分组队列的一个或多个阵列相关联。 该方法还包括为阵列生成索引，其中索引与时间戳相关联，以便确定高速分组数据网络的突发大小。

公开(公告)号：US20100238888A1

公开(公告)日：2010-09-23

申请号：US12727163

申请日：2010-03-18

Applicant: Ashwin Sampath ,  Sundeep Rangan ,  Raja Sekhar Bachu

Inventor： Ashwin Sampath ,  Sundeep Rangan ,  Raja Sekhar Bachu

IPC: H04W72/04

CPC classification number: H04W24/02 ,  H04W72/08 ,  H04W72/082 ,  H04W84/045

Abstract: Systems, apparatus, methods and computer program products are provided. In some embodiments, a method for facilitating interference management in an unplanned wireless communication system is provided. The method can include a non-serving base station synchronizing a non-serving base station downlink subframe to a serving base station downlink subframe, wherein the serving base station downlink subframe is transmitted from a serving base station to a user equipment served by the serving base station. The method can also include the non-serving base station decoding one or more control channel symbols of the serving base station downlink subframe; and determining information for performing interference management associated with the user equipment. The determined information can be based, at least, in part, on the decoded one or more control channel symbols of the serving base station downlink subframe.

Abstract translation: 提供系统，设备，方法和计算机程序产品。 在一些实施例中，提供了一种用于促进非计划无线通信系统中的干扰管理的方法。 该方法可以包括将非服务基站下行链路子帧同步到服务基站下行链路子帧的非服务基站，其中服务基站下行链路子帧从服务基站发送到由服务基站服务的用户设备 站。 该方法还可以包括非服务基站解码服务基站下行链路子帧的一个或多个控制信道符号; 以及确定用于执行与所述用户设备相关联的干扰管理的信息。 所确定的信息可以至少部分地基于服务基站下行链路子帧的解码的一个或多个控制信道符号。

公开(公告)号：US20100220626A1

公开(公告)日：2010-09-02

申请号：US12778270

申请日：2010-05-12

Applicant: Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Murari Srinivasan

Inventor： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Murari Srinivasan

IPC: H04L12/26 ,  H04W24/00 ,  H04B7/00

CPC classification number: H04W72/1284 ,  H04B17/24 ,  H04W8/24 ,  H04W24/10 ,  H04W72/1231

Abstract: Methods and apparatus for communicating transmission backlog information are described. Reporting control factors are utilized to expand reporting possibilities for a fixed bit size request report. At least one report control factor is determined as a function of channel quality information, power information, device capability information, and/or quality of service information. A transmission backlog report value is interpreted as a function of a reporting control factor. A wide range of quantization schemes for reporting transmission backlog information are facilitated corresponding to a small bit size report. A communications device can adaptively select a quantization request level closely matched to its current needs such as to provide an accurate representation of its current traffic channel resource needs. A communications device may request a number of frames in a request report and the same report may be indirectly requesting a number of communications segments needed to clear its transmission backlog.

Abstract translation: 描述用于传送传输积压信息的方法和装置。 报告控制因素用于扩展固定位大小请求报告的报告可能性。 至少一个报告控制因子被确定为信道质量信息，功率信息，设备能力信息和/或服务质量信息的函数。 传输积压报告值被解释为报告控制因子的函数。 用于报告传输积压信息的宽范围的量化方案对应于小位尺寸报告是便利的。 通信设备可以自适应地选择与其当前需求紧密匹配的量化请求级别，以提供其当前业务信道资源需求的精确表示。 通信设备可以在请求报告中请求多个帧，并且相同的报告可以间接地请求清除其传输积压所需的多个通信段。

公开(公告)号：US20100211540A9

公开(公告)日：2010-08-19

申请号：US11486601

申请日：2006-07-14

Applicant: Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Rajiv Laroia

Inventor： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Rajiv Laroia

IPC: G06F17/30

CPC classification number: H04W24/10 ,  H04L1/0006 ,  H04L1/0026 ,  H04W24/00

Abstract: Techniques for efficiently sending reports in a wireless communication system are described. Reports may be sent repetitively in accordance with a reporting format. A terminal receives an assignment of a control channel used to send reports and determines a reporting format to use based on the assignment. The reporting format indicates a specific sequence of reports sent in specific locations of a control channel frame. The terminal generates a set of reports for each reporting interval and arranges the set of reports in accordance with the reporting format. The terminal repetitively sends a plurality of sets of reports in a plurality of reporting intervals. Reports may also be sent adaptively based on operating conditions. An appropriate reporting format may be selected based on the operating conditions of the terminal, which may be characterized by environment (e.g., mobility), capabilities, QoS, and/or other factors.

Abstract translation: 描述在无线通信系统中有效地发送报告的技术。 可以按照报告格式重复发送报告。 终端接收用于发送报告的控制信道的分配，并根据分配确定要使用的报告格式。 报告格式指示在控制信道帧的特定位置发送的特定报告序列。 终端为每个报告间隔生成一组报告，并根据报告格式安排报告集。 终端在多个报告间隔重复发送多组报告。 报告也可以根据操作条件自适应地发送。 可以基于可以由环境（例如，移动性），能力，QoS和/或其他因素来表征的终端的操作条件来选择适当的报告格式。

公开(公告)号：US20100178942A1

公开(公告)日：2010-07-15

申请号：US12730154

申请日：2010-03-23

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Prashanth Hande

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Prashanth Hande

IPC: H04W68/02

CPC classification number: H04W68/025 ,  Y02D70/00

Abstract: Methods and apparatus for efficient two-stage paging wireless communications systems are described. Wireless terminals are assigned to paging groups. A few first paging message information bits are modulated (using non-coherent modulation) into a first paging signal and communicated from a base station to wireless terminals. WTs wake-up, receive the first paging signal and quickly ascertain whether its paging group should expect a second paging signal, if so, the WT is operated to receive the second paging signal; otherwise, the WT goes back to sleep conserving power. The base station modulates (using coherent modulation) a number of second message information bits into a second paging signal and transmits the signal to WTs. From the information in first and second paging signals, a WT can determine that it is the paged WT and process the paging instructions. The intended paged WT can transmit an acknowledgement signal on a dedicated uplink resource.

公开(公告)号：US07630339B2

公开(公告)日：2009-12-08

申请号：US10763944

申请日：2004-01-23

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

IPC: H04Q7/00

CPC classification number: H04B7/0626

Abstract: Methods and apparatus for providing channel diversity to wireless terminals (WTs) in a manner that reduces the latency between the time a WT encounters satisfactory channel conditions are described. A plurality of communications channels with different physical characteristics are maintained in a cell by a base station (BS). Each WT monitors multiple channels and maintains multiple channel estimates at the same time so that rapid switching between channels is possible. Channel quality information is conveyed from each WT to the BS. The WT or BS selects a channel based on the measured channel quality. By supporting multiple channels and by introducing periodic variations into the channels in various embodiments, the time before a WT encounters a channel with good or acceptable channel conditions is minimized even if the WT does not change location. Multiple antennas are used at the BS to support numerous channels simultaneously, e.g., by controlling antenna patterns.

Abstract translation: 描述了以降低WT遇到令人满意的信道条件的时间之间的等待时间的方式向无线终端（WT）提供信道分集的方法和装置。 具有不同物理特性的多个通信信道由基站（BS）保持在小区中。 每个WT监视多个信道并同时维持多个信道估计，使得信道之间的快速切换是可能的。 信道质量信息从每个WT传送到BS。 WT或BS基于测量的信道质量来选择信道。 通过支持多个信道并且在各种实施例中引入周期性变化到信道中，即使WT不改变位置，WT遇到具有良好或可接受的信道条件的信道之前的时间被最小化。 在BS处使用多个天线来同时支持多个信道，例如通过控制天线方向图。

公开(公告)号：US07610024B2

公开(公告)日：2009-10-27

申请号：US11284285

申请日：2005-11-21

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank A. Lane ,  Prashanth Hande

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank A. Lane ,  Prashanth Hande

IPC: H04B7/06

CPC classification number: H04B7/0604 ,  H01Q3/24 ,  H01Q3/2605 ,  H04B7/061 ,  H04B7/0691 ,  H04B7/0805 ,  H04L1/0026 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/006 ,  H04W52/42

Abstract: Transmit and/or receive diversity is achieved using multiple antennas. In some embodiments, a single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas. At any given time, a controllable switching module couples the single transmitter chain to one the plurality of transmit antennas. Over time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching decisions are based upon predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. In some OFDM embodiments, each of multiple transmitter chains is coupled respectively to a different transmit antenna. Information to be transmitted is mapped to a plurality of tones. Different subsets of tones are formed for and transmitted through different transmit chain/antenna sets simultaneously. The balance of tones allocated to the subsets for each antenna are changed as a function of predetermined information, dwell information, and/or channel condition feedback information.

Abstract translation: 使用多个天线实现发射和/或接收分集。 在一些实施例中，无线终端内的单个发射机链随时间耦合到多个发射天线。 在任何给定时间，可控开关模块将单个发射机链耦合到多个发射天线中的一个。 随着时间的推移，开关模块将来自单个发射机链的输出信号耦合到不同的发射天线。 切换决定基于预定信息，停留信息和/或信道条件反馈信息。 在一些驻留和/或信道估计边界上执行切换。 在一些OFDM实施例中，多个发射机链中的每一个分别耦合到不同的发射天线。 要发送的信息被映射到多个音调。 为不同的发射链/天线组同时形成和发送不同的音调子集。 分配给每个天线的子集的音调的平衡作为预定信息，停留信息和/或信道条件反馈信息的函数而改变。

公开(公告)号：US20090245442A1

公开(公告)日：2009-10-01

申请号：US12404956

申请日：2009-03-16

Applicant: Ray Siddharth ,  Sundeep Rangan

Inventor： Ray Siddharth ,  Sundeep Rangan

IPC: H04B7/10

CPC classification number: H04B7/0617 ,  H04B7/0848 ,  H04L1/0001 ,  H04L1/20 ,  H04L25/0206 ,  H04L2025/03426

Abstract: Methods and apparatus for avoiding overflow and underflow conditions through the determination of appropriate scaling factors in signal estimation processing in a receiver are described. The receiver estimates transmitted symbols from one or more transmitter device antennas, while avoiding underflow and overflow conditions. A pilot based noise estimate and an estimated expected received signal power, corresponding to a transmit antenna, are used to generate an SNR corresponding to the transmit antenna. The generated SNR is used to determine, e.g., select from a fixed size set of predetermined scale factor values, a scale factor to be used for estimation processing associated with the transmit antenna. In some embodiments, the generated scaling factors are used by a fixed point processing linear least squares error estimation module. Scaling factor determination is performed at a rate which is slower than the rate at which symbols are received from a transmit antenna.

Abstract translation: 描述了通过在接收机中的信号估计处理中确定适当的缩放因子来避免溢出和下溢条件的方法和装置。 接收机估计来自一个或多个发射机设备天线的发送符号，同时避免下溢和溢出条件。 使用对应于发射天线的基于导频的噪声估计和估计的预期接收信号功率来产生对应于发射天线的SNR。 所生成的SNR用于确定例如从预定比例因子值的固定大小集合中选择要用于与发射天线相关联的估计处理的比例因子。 在一些实施例中，生成的缩放因子由固定点处理线性最小二乘误差估计模块使用。 缩放因子确定以比从发送天线接收符号的速率慢的速率执行。

公开(公告)号：US07558245B2

公开(公告)日：2009-07-07

申请号：US11322538

申请日：2005-12-30

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth T. Sampath

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth T. Sampath

IPC: H04J3/06

CPC classification number: H04L27/2663 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2665 ,  H04L27/2675

Abstract: A method and apparatus for joint time and frequency synchronization for orthogonal frequency division multiplexing (OFDM) systems. A multitone pilot signal is sent in a designated OFDM symbol period. The receiver synchronizes to the pilot signal in a two-stage procedure. The first stage estimates the frequency offset coarsely with a frequency-domain correlation method and estimates the time offset with smoothed time-domain correlation. In a multipath channel, the smoothed time offset estimate is used to locate a cyclic prefix interval which captures the maximum total signal energy. The second stage improves the frequency estimate with a computationally efficient numerical optimization method.

公开(公告)号：US20090170430A1

公开(公告)日：2009-07-02

申请号：US12339462

申请日：2008-12-19

Applicant: Sundeep Rangan ,  Frank Lane

Inventor： Sundeep Rangan ,  Frank Lane

IPC: H04B7/24

CPC classification number: H04J3/0685 ,  H04L5/0053

Abstract: System and method for providing a timestamp packetized data interface between an RF unit and a modem. According to one embodiment, the RF unit receives an inbound RF signal, processes and demodulates the inbound RF signal to generate samples, generates a timestamp indicative of when the inbound RF signal was received, packetizes and multiplexes the samples and the timestamp, and sends the multiplexed stream to the modem. The modem generates received data from the samples. If the received data type requires a response to be sent at a particular time, the modem generates symbols from responsive outbound data, generates a timestamp which indicates when the outbound data is to be transmitted, packetizes and multiplexes the symbols and the timestamp, and sends the multiplexed stream to the RF unit. The RF unit generates an outbound RF signal from the symbols, and transmits the outbound signal in accordance with the timestamp.

Abstract translation: 用于在RF单元和调制解调器之间提供时间戳分组数据接口的系统和方法。 根据一个实施例，RF单元接收入站RF信号，处理和解调入站RF信号以产生采样，产生指示何时接收到入站RF信号的时间戳，分组并复用样本和时间戳，并发送 多路复用流到调制解调器。 调制解调器从样本生成接收到的数据。 如果接收到的数据类型需要在特定时间发送响应，则调制解调器从响应的出站数据生成符号，生成指示何时要发送出站数据的时间戳，分组和多路复用符号和时间戳，并发送 多路复用流到RF单元。 RF单元从符号生成出站RF信号，并根据时间戳发送出站信号。