公开(公告)号：US20100144282A1

公开(公告)日：2010-06-10

申请号：US12630130

申请日：2009-12-03

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

IPC分类号： H04B15/00 ,  H04B7/005

CPC分类号： H04B7/0626

摘要： 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.

摘要翻译： 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：US20100041355A1

公开(公告)日：2010-02-18

申请号：US12606079

申请日：2009-10-26

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

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

IPC分类号： H04B1/04

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

摘要： 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.

摘要翻译： 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：US20060092881A1

公开(公告)日：2006-05-04

申请号：US11302729

申请日：2005-12-14

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Prashanth Hande

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Prashanth Hande

IPC分类号： H04Q7/00

CPC分类号： H04L5/023 ,  H04B1/7097 ,  H04B17/24 ,  H04B17/345 ,  H04B2201/70701 ,  H04B2201/70702

摘要： Methods and apparatus for collecting, measuring, reporting and/or using information which can be used for interference control purposes. Wireless terminals measure signals transmitted from one or more base stations, e.g., base station sector transmitters. The measured signals may be, e.g., beacon signals and/or pilot signals. From the measured signals, the wireless terminal generates one or more gain ratios which provide information about the relative gain of the communications channels from different base station sectors to the wireless terminal. This information represents interference information since it provides information about the signal interference that will be caused by transmissions from other base station sectors relative to transmissions made by the base station sector to which the wireless terminal is attached. Based on the signal energy measurements and relative gains generated from the energy measures, reports are generated in accordance with the invention and sent to one or more base stations.

公开(公告)号：US20060083161A1

公开(公告)日：2006-04-20

申请号：US11251069

申请日：2005-10-14

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Prashanth Hande

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Prashanth Hande

IPC分类号： H04J11/00 ,  H04B7/00 ,  H04B7/216

CPC分类号： H04B1/7103 ,  H04B1/7097 ,  H04B7/022 ,  H04B17/24 ,  H04B17/318 ,  H04B17/345 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04L5/023

摘要： Methods and apparatus for collecting, measuring, reporting and/or using information which can be used for interference control purposes. Wireless terminals measure signals transmitted from one or more base stations, e.g., base station sector transmitters. The measured signals may be, e.g., beacon signals and/or pilot signals. From the measured signals, the wireless terminal generates one or more gain ratios which provide information about the relative gain of the communications channels from different base station sectors to the wireless terminal. This information represents interference information since it provides information about the signal interference that will be caused by transmissions from other base station sectors relative to transmissions made by the base station sector to which the wireless terminal is attached. Based on the signal energy measurements and relative gains generated from the energy measures, reports are generated in accordance with the invention and sent to one or more base stations.

公开(公告)号：US06922388B1

公开(公告)日：2005-07-26

申请号：US09503041

申请日：2000-02-11

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Sathyadev Venkata Uppala

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Sathyadev Venkata Uppala

IPC分类号： H04J11/00 ,  H04B7/26 ,  H04J3/06 ,  H04L5/02 ,  H04L7/10 ,  H04L27/26

CPC分类号： H04J3/0682 ,  H04L5/023 ,  H04L27/2607 ,  H04L27/2614 ,  H04L27/2646 ,  H04L27/2662

摘要： Signal construction, detection and estimation techniques for use in uplink timing synchronization and access control in an orthogonal frequency division multiplexed (OFDM) wireless system or other type of wireless communication system. In accordance with an illustrative embodiment of the invention, timing and access signals to be transmitted in designated timing and access intervals are constructed from orthogonal multitone signals. The multitone signals may be similar to multitone signals used in OFDM data transmission, except that a cyclic prefix associated with reception of the signals in a base station is extended to cover the timing errors of mobile stations not yet synchronized. The invention also provides design techniques which optimize the time resolvability and peak-to-average ratio of the multitone signals, an efficient fast Fourier transform (FFT) based technique for maximum likelihood timing estimation, and a robust linear filtering technique for averaging timing estimates from different synchronizations.

摘要翻译： 用于正交频分复用（OFDM）无线系统或其他类型的无线通信系统中的上行链路定时同步和接入控制的信号构造，检测和估计技术。 根据本发明的说明性实施例，将以指定的定时和访问间隔发送的定时和接入信号由正交多音信号构成。 多音信号可以类似于在OFDM数据传输中使用的多音信号，除了与基站中的信号的接收相关联的循环前缀被扩展以覆盖尚未同步的移动台的定时错误。 本发明还提供了优化多音信号的时间可解析性和峰均比的设计技术，用于最大似然定时估计的基于有效快速傅立叶变换（FFT）的技术，以及用于平均定时估计的鲁棒线性滤波技术 不同的同步。

公开(公告)号：US09119220B2

公开(公告)日：2015-08-25

申请号：US11610189

申请日：2006-12-13

申请人： Arnab Das ,  Sundeep Rangan ,  Yunus Hussain ,  Samel Celebi

发明人： Arnab Das ,  Sundeep Rangan ,  Yunus Hussain ,  Samel Celebi

IPC分类号： H04B1/04 ,  H04W72/12

CPC分类号： H04W72/1284 ,  H04W72/1221 ,  H04W72/1252

摘要： Methods and apparatus for efficient communication of backlog information, e.g., backlog information indicating amounts of uplink traffic waiting to transmitted by a wireless terminal are described. Delta backlog reports are used in addition to absolute backlog reports, thus reducing control signaling overhead, at least some information communicated in a delta backlog report being referenced with respect to a previously transmitted backlog report. A base station uses received backlog information from wireless terminals in determining scheduling of uplink traffic channel segments In some embodiments, the absolute backlog report uses a first fixed size report format, while the delta backlog report using a second fixed size report format, said second size being different from said first fixed size.

摘要翻译： 描述了用于积压信息的有效通信的方法和装置，例如指示等待由无线终端发送的上行链路业务量的积压信息。 除了绝对的积压报告之外，还使用了增量积压报告，从而减少了控制信号开销，至少在以前发送的积压报告中引用的增量积压报告中传达的至少一些信息。 基站在确定上行链路业务信道段的调度中使用来自无线终端的接收的积压信息。在一些实施例中，绝对积压报告使用第一固定大小报告格式，而使用第二固定大小报告格式的差异积压报告，所述第二大小 与所述第一固定尺寸不同。

公开(公告)号：US08547857B2

公开(公告)日：2013-10-01

申请号：US11943489

申请日：2007-11-20

申请人： Xinzhou Wu ,  Sundeep Rangan ,  Prashanth Hande ,  Arnab Das ,  Junyi Li

发明人： Xinzhou Wu ,  Sundeep Rangan ,  Prashanth Hande ,  Arnab Das ,  Junyi Li

IPC分类号： H04W72/00 ,  H04W4/00 ,  H04W24/00 ,  H04L12/26 ,  H04B15/00

CPC分类号： H04W72/082 ,  H04W72/0406 ,  H04W72/12

摘要： Systems and methodologies are described that facilitate scheduling uplink transmissions. For instance, a time sharing scheme can be utilized such that differing mobile devices can be scheduled to transmit during differing time slots; however, it is also contemplated that a static scheme can be employed. Pursuant to an illustration, an interference budget can be combined with a time varying weighting factor associated with a base station; the weighting factor can be predefined and/or adaptively adjusted (e.g., based upon a load balancing mechanism). Moreover, the weighted interference budget can be leveraged for selecting mobile devices for uplink transmission (e.g., based at least in part upon path loss ratios of the mobile devices). Further, disparate interference budgets can be utilized by differing channels of a sector at a particular time. Also, for example, a base station can assign a loading factor to be utilized by wireless terminal(s) for generating channel quality report(s).

公开(公告)号：US08477684B2

公开(公告)日：2013-07-02

申请号：US11943551

申请日：2007-11-20

申请人： Aamod Khandekar ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Sundeep Rangan ,  Arnab Das

发明人： Aamod Khandekar ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Sundeep Rangan ,  Arnab Das

IPC分类号： H04W4/00

CPC分类号： H04L1/1607 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0053 ,  H04W72/0413 ,  H04W72/042

摘要： Techniques for sending control messages are described. In an aspect, assignment messages may be acknowledged based on either linked or dedicated acknowledgement (ACK) resources. A terminal may receive an assignment message from a base station, determine whether to acknowledge the assignment message, and determine ACK resources to use to acknowledge the assignment message. The ACK resources may be linked to a control block on which the assignment message was received, linked to resources given by the assignment message, or assigned to the terminal. The terminal may send the acknowledgement on the ACK resources. In another aspect, a control message may be acknowledged based on ACK resources determined based on the control message or the control block. The ACK resources may be linked to resources assigned by the control message or linked to the control message. The terminal may send an acknowledgement for the control message on the ACK resources.

摘要翻译： 描述用于发送控制消息的技术。 在一方面，可以基于链接或专用确认（ACK）资源来确认分配消息。 终端可以从基站接收分配消息，确定是否确认分配消息，并确定用于确认分配消息的ACK资源。 ACK资源可以链接到其上接收到分配消息的控制块，链接到由分配消息给出的资源或分配给终端。 终端可以在ACK资源上发送确认。 在另一方面，可以基于基于控制消息或控制块确定的ACK资源来确认控制消息。 ACK资源可以链接到由控制消息分配或链接到控制消息的资源。 终端可以在ACK资源上发送关于控制消息的确认。

公开(公告)号：US08320928B2

公开(公告)日：2012-11-27

申请号：US13218647

申请日：2011-08-26

申请人： Xinzhou Wu ,  Sundeep Rangan ,  Prashanth Hande ,  Arnab Das ,  Junyi Li

发明人： Xinzhou Wu ,  Sundeep Rangan ,  Prashanth Hande ,  Arnab Das ,  Junyi Li

IPC分类号： H04W88/02

CPC分类号： H04W72/1231 ,  H04W72/1268

摘要： Systems and methodologies are described that facilitate scheduling uplink transmissions. For instance, a time sharing scheme can be utilized such that differing mobile devices can be scheduled to transmit during differing time slots; however, it is also contemplated that a static scheme can be employed. Pursuant to an illustration, an interference budget can be combined with a time varying weighting factor associated with a base station; the weighting factor can be predefined and/or adaptively adjusted (e.g., based upon a load balancing mechanism). Moreover, the weighted interference budget can be leveraged for selecting mobile devices for uplink transmission (e.g., based at least in part upon path loss ratios of the mobile devices). Further, disparate interference budgets can be utilized by differing channels of a sector at a particular time. Also, for example, a base station can assign a loading factor to be utilized by wireless terminal(s) for generating channel quality report(s).

公开(公告)号：US20120294258A1

公开(公告)日：2012-11-22

申请号：US13556468

申请日：2012-07-24

申请人： Siddharth Ray ,  Ritesh K. Madan ,  Ashwin Sampath ,  Sundeep Rangan ,  Arnab Das

发明人： Siddharth Ray ,  Ritesh K. Madan ,  Ashwin Sampath ,  Sundeep Rangan ,  Arnab Das

IPC分类号： H04W72/04

CPC分类号： H04W52/367 ,  H04L5/0037 ,  H04L5/0058 ,  H04W52/146 ,  H04W52/346 ,  H04W72/04 ,  H04W72/12

摘要： Certain aspects of the present disclosure relate to a technique of designing a Media Access Control (MAC) scheduler for uplink communication in high rate wireless data systems, such as Long Term Evolution (LTE) wireless communication systems.

摘要翻译： 本公开的某些方面涉及在诸如长期演进（LTE）无线通信系统的高速率无线数据系统中设计用于上行链路通信的媒体访问控制（MAC）调度器的技术。