公开(公告)号：US09467958B2

公开(公告)日：2016-10-11

申请号：US12178157

申请日：2008-07-23

申请人： Alexei Gorokhov ,  Avneesh Agrawal ,  Samir Kapoor

发明人： Alexei Gorokhov ,  Avneesh Agrawal ,  Samir Kapoor

IPC分类号： H04J3/06 ,  H04W56/00 ,  H04B7/26 ,  H04J11/00 ,  H04W48/10 ,  H04W52/14 ,  H04W92/10

CPC分类号： H04W56/0015 ,  H04B7/2693 ,  H04J11/0069 ,  H04W48/10 ,  H04W52/143 ,  H04W92/10

摘要： Techniques for mitigating temporary loss of synchronization in a wireless communication system are described. In an aspect, a cell may periodically broadcast a mode indicator to indicate synchronous operation or asynchronous operation by the cell. The cell may also broadcast its cell identity (ID), which may omit the mode indicator and would then remain unchanged when the cell switches between asynchronous and synchronous operation. In another aspect, the cell may send system time information indicative of its updated system time when switching from asynchronous operation to synchronous operation. The updated system time may be used for communication with terminals after the switch to synchronous operation. In yet another aspect, the cell may decrease its transmit power prior to switching synchronization mode, switch synchronization mode when its transmit power reaches a predetermined power level, and thereafter increase its transmit power.

摘要翻译： 描述了用于减轻无线通信系统中的同步暂时丢失的技术。 在一方面，小区可以周期性地广播模式指示符以指示小区的同步操作或异步操作。 小区还可以广播其小区身份（ID），其可以省略模式指示符，并且在小区在异步和同步操作之间切换时将保持不变。 另一方面，当从异步操作切换到同步操作时，小区可以发送指示其更新的系统时间的系统时间信息。 在切换到同步操作之后，更新的系统时间可以用于与终端的通信。 在另一方面，小区可以在切换同步模式之前降低其发射功率，当其发射功率达到预定功率电平时，切换同步模式，然后增加其发射功率。

公开(公告)号：US20090052430A1

公开(公告)日：2009-02-26

申请号：US12178157

申请日：2008-07-23

申请人： Alexei Gorokhov ,  Avneesh Agrawal ,  Samir Kapoor

发明人： Alexei Gorokhov ,  Avneesh Agrawal ,  Samir Kapoor

IPC分类号： H04J3/06

CPC分类号： H04W56/0015 ,  H04B7/2693 ,  H04J11/0069 ,  H04W48/10 ,  H04W52/143 ,  H04W92/10

摘要： Techniques for mitigating temporary loss of synchronization in a wireless communication system are described. In an aspect, a cell may periodically broadcast a mode indicator to indicate synchronous operation or asynchronous operation by the cell. The cell may also broadcast its cell identity (ID), which may omit the mode indicator and would then remain unchanged when the cell switches between asynchronous and synchronous operation. In another aspect, the cell may send system time information indicative of its updated system time when switching from asynchronous operation to synchronous operation. The updated system time may be used for communication with terminals after the switch to synchronous operation. In yet another aspect, the cell may decrease its transmit power prior to switching synchronization mode, switch synchronization mode when its transmit power reaches a predetermined power level, and thereafter increase its transmit power.

摘要翻译： 描述了用于减轻无线通信系统中的同步暂时丢失的技术。 在一方面，小区可以周期性地广播模式指示符以指示小区的同步操作或异步操作。 小区还可以广播其小区身份（ID），其可以省略模式指示符，并且在小区在异步和同步操作之间切换时将保持不变。 另一方面，当从异步操作切换到同步操作时，小区可以发送指示其更新的系统时间的系统时间信息。 在切换到同步操作之后，更新的系统时间可以用于与终端的通信。 在另一方面，在切换同步模式之前，小区可以降低其发射功率，当其发射功率达到预定功率电平时，切换同步模式，然后增加其发射功率。

公开(公告)号：US08665859B2

公开(公告)日：2014-03-04

申请号：US13406955

申请日：2012-02-28

申请人： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

发明人： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

IPC分类号： H04J3/06 ,  H04W56/00

CPC分类号： H04W56/00 ,  H04L5/0007 ,  H04L5/0051 ,  H04L5/023 ,  H04L5/1453 ,  H04L27/0014 ,  H04L27/2607 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L2027/0055 ,  H04L2027/0083

摘要： A multi-point communications system is set forth herein. The communications system includes a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timing signal. At least one of the predetermined number of bins includes a pilot tone sub-symbol having a frequency corresponding to a clock signal. The communications system may also include a receiver for receiving the OFDM/DMT symbols via the transmission medium. The receiver demodulates the received symbols using at least one timing signal.

摘要翻译： 本文阐述了一种多点通信系统。 通信系统包括用于在传输介质上经过预定数量的箱传输OFDM / DMT符号的发射机。 使用至少一个定时信号来生成OFDM / DMT符号。 预定数量的箱中的至少一个包括具有对应于时钟信号的频率的导频音子符号。 通信系统还可以包括用于经由传输介质接收OFDM / DMT符号的接收机。 接收机使用至少一个定时信号来解调所接收的符号。

公开(公告)号：US20060034166A1

公开(公告)日：2006-02-16

申请号：US11201853

申请日：2005-08-11

申请人： Daniel Marchok ,  Richard Younce ,  Samir Kapoor ,  Peter Melsa

发明人： Daniel Marchok ,  Richard Younce ,  Samir Kapoor ,  Peter Melsa

IPC分类号： H04J11/00

CPC分类号： H04L27/2657 ,  H04L5/023 ,  H04L5/1453 ,  H04L27/2602 ,  H04L27/2662

摘要： A multi-point communications system that is set forth herein. The communication system comprises a head end unit disposed at a primary site and a plurality of receivers disposed at remote sites. The head end unit includes a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are transmitted in periodically occurring formatted symbol frames. The cyclic prefix includes a predetermined periodic signal superimposed thereon. The receivers receive the OFDM/DMT symbols over a subset of the predetermined number of bins from the transmission medium and use the superimposed signals to attain symbol alignment.

摘要翻译： 本文中阐述的多点通信系统。 通信系统包括设置在主站点处的头端单元和设置在远程站点处的多个接收器。 头端单元包括用于通过传输介质在预定数量的箱上发送OFDM / DMT符号的发射机。 OFDM / DMT符号以周期性出现的格式化符号帧发送。 循环前缀包括叠加在其上的预定周期信号。 接收机在来自传输介质的预定数量的分组的子集上接收OFDM / DMT符号，并使用叠加的信号来获得符号对准。

公开(公告)号：US6122246A

公开(公告)日：2000-09-19

申请号：US900312

申请日：1997-07-25

申请人： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

发明人： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

IPC分类号： H04L5/02 ,  H04L27/26 ,  H04M11/06 ,  H04B3/10

CPC分类号： H04L5/023 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L5/1453

摘要： A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timing signal. At least one of the predetermined number of bins includes a pilot tone sub-symbol having a frequency corresponding to the clock signal. The communications system also includes a receiver for receiving the OFDM/DMT symbols from the transmission medium. The receiver demodulates the received symbols using at least one timing signal. The receiver has a first pilot tone search mode of operation in which the receiver adjusts its timing signal to scan the frequency range of the predetermined number of bins looking for the pilot tone sub-symbol and identifies the bin including the pilot tone sub-symbol. The receiver further has a subsequent second pilot tone acquisition mode in which the receiver adjusts the timing signal to receive the identified bin containing the pilot tone sub-symbol and measures phase differences between successive pilot tone sub-symbols to thereby perform a further adjustment of the timing signal so that the pilot tone sub-symbol is received within a frequency range sufficient for subsequent phase locked loop processing thereof.

公开(公告)号：US08917673B2

公开(公告)日：2014-12-23

申请号：US11487050

申请日：2006-07-14

申请人： Samir Kapoor ,  Junyi Li ,  Rajiv Laroia

发明人： Samir Kapoor ,  Junyi Li ,  Rajiv Laroia

IPC分类号： H04W4/00 ,  H04W36/06

CPC分类号： H04W36/06 ,  H04L5/14 ,  H04W72/02

摘要： Transmission techniques using configurable channels for the downlink and/or uplink are described. In one aspect, the downlink channel and/or uplink channel may be independently selected for a terminal. The terminal may establish a connection with a base station on default downlink and uplink channels. Another downlink channel and/or another uplink channel may be selected based on various factors such as channel quality, loading, and interference. The terminal would then switch to the new downlink and/or uplink channel for communication. In another aspect, the base stations broadcast sector information used by the terminals for communication and/or channel selection. The sector information may include various types of information such as the available downlink and uplink channels, the frequencies of the available channels, the loading on the available channels, and QoS information. The terminals may select a sector, a downlink channel, and/or an uplink channel based on the sector information.

摘要翻译： 描述了使用用于下行链路和/或上行链路的可配置信道的传输技术。 在一个方面，可以为终端独立地选择下行链路信道和/或上行链路信道。 终端可以在默认下行链路和上行链路信道上建立与基站的连接。 可以基于诸如信道质量，加载和干扰的各种因素来选择另一个下行链路信道和/或另一个上行链路信道。 终端然后将切换到用于通信的新的下行链路和/或上行链路信道。 在另一方面，基站广播由终端用于通信和/或信道选择的扇区信息。 扇区信息可以包括各种类型的信息，例如可用的下行链路和上行链路信道，可用信道的频率，可用信道上的负载和QoS信息。 终端可以基于扇区信息来选择扇区，下行链路信道和/或上行链路信道。

公开(公告)号：US08036104B2

公开(公告)日：2011-10-11

申请号：US10619384

申请日：2003-07-14

申请人： M. Scott Corson ,  Samir Kapoor ,  Rajiv Laroia ,  Vincent Park ,  Arthur Stephens

发明人： M. Scott Corson ,  Samir Kapoor ,  Rajiv Laroia ,  Vincent Park ,  Arthur Stephens

IPC分类号： G01R31/08

CPC分类号： G06F11/0709 ,  G06F11/079 ,  H04L41/0213 ,  H04L41/0663 ,  H04L41/5012

摘要： Techniques for supporting fault tolerance in communications systems are described. Fault notification messages are communicated which may be affected by a detected/reported service disruption. End nodes receiving a fault notification message determine if the message indicates a disruption in a node that is critical to the end node receiving the message. If the indicated disruption is in a critical node, the end node takes action to ameliorate the effect of the reported condition. Fault notification messages indicating disruptions in nodes which are not critical to the end node receiving the fault notification message may be ignored once it is determined that the indicated disruption is in a node which is not critical to the end node receiving the message. The invention described herein minimizes service disruption following fault, failure or outage of critical network nodes, improving overall system robustness and resiliency.

摘要翻译： 描述了用于支持通信系统中的容错的技术。 故障通知消息被传送，可能受到检测到/报告的服务中断的影响。 接收故障通知消息的端节点确定消息是否指示对于接收消息的终端节点至关重要的节点的中断。 如果指示的中断处于关键节点，则结束节点采取行动来改善报告条件的影响。 一旦确定所指示的中断在对接收消息的最终节点不重要的节点中，则指示对接收到故障通知消息的终端节点不重要的节点中的中断的故障通知消息可以被忽略。 本文描述的发明最大限度地减少关键网络节点的故障，故障或中断之后的服务中断，提高整体系统的鲁棒性和弹性。

公开(公告)号：US20110228690A1

公开(公告)日：2011-09-22

申请号：US13118052

申请日：2011-05-27

申请人： M. Scott Corson ,  Samir Kapoor ,  Rajiv Laroia ,  Vincent Park

发明人： M. Scott Corson ,  Samir Kapoor ,  Rajiv Laroia ,  Vincent Park

IPC分类号： H04W24/00

CPC分类号： H04W28/06 ,  H04W24/00 ,  H04W36/18 ,  H04W40/02 ,  H04W84/12

摘要： A method and apparatus for providing uplink macro-diversity in packet-switched networks that allows packets and/or portions of packets, e.g., frames, to be selectively sent from an end node, e.g., wireless communication device or mobile terminal, over a set of multiple communication connections, e.g., physical-layer or link-layer connections, to one or more access nodes, e.g., base stations. Uplink macro-diversity is achieved in part through intelligent selective forwarding over multiple communication connections, where the forwarding decision is controlled by the end node based on a variety of factors, e.g., physical-layer channel conditions and/or higher layer policy. The forwarding decision is executed on a rapid timescale, e.g., on a per packet basis, to adapt to the dynamically varying conditions of the set of communication connections.

摘要翻译： 一种用于在分组交换网络中提供上行链路宏分集的方法和装置，其允许分组和/或分组（例如，帧）的一部分从终端节点（例如，无线通信设备或移动终端）经由一组 多个通信连接（例如，物理层或链路层连接）连接到一个或多个接入节点，例如基站。 上行链路宏分集部分地通过多个通信连接上的智能选择转发实现，其中转发决策由终端节点基于诸如物理层信道条件和/或更高层策略的各种因素来控制。 转发决定以快速时间尺度（例如，基于每个分组）执行，以适应通信连接集合的动态变化条件。

公开(公告)号：US20100104035A1

公开(公告)日：2010-04-29

申请号：US12587694

申请日：2009-10-09

申请人： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

发明人： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

IPC分类号： H04L1/02

CPC分类号： H04W56/00 ,  H04L5/0007 ,  H04L5/0051 ,  H04L5/023 ,  H04L5/1453 ,  H04L27/0014 ,  H04L27/2607 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L2027/0055 ,  H04L2027/0083

摘要： A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timing signal. At least one of the predetermined number of bins includes a pilot tone sub-symbol having a frequency corresponding to the clock signal. The communications system also includes a receiver for receiving the OFDM/DMT symbols from the transmission medium. The receiver demodulates the received symbols using at least one timing signal. The receiver has a first pilot tone search mode of operation in which the receiver adjusts its timing signal to scan the frequency range of the predetermined number of bins looking for the pilot tone sub-symbol and identifies the bin including the pilot tone sub-symbol. The receiver further has a subsequent second pilot tone acquisition mode in which the receiver adjusts the timing signal to receive the identified bin containing the pilot tone sub-symbol and measures phase differences between successive pilot tone sub-symbols to thereby perform a further adjustment of the timing signal so that the pilot tone sub-symbol is received within a frequency range sufficient for subsequent phase locked loop processing thereof.

摘要翻译： 本文阐述了一种多点通信系统。 通信系统包括用于通过传输介质在预定数量的箱上发送OFDM / DMT符号的发射机。 使用至少一个定时信号来生成OFDM / DMT符号。 预定数量的箱中的至少一个包括具有对应于时钟信号的频率的导频音子符号。 通信系统还包括用于从传输介质接收OFDM / DMT符号的接收机。 接收机使用至少一个定时信号来解调所接收的符号。 接收机具有第一导频音搜索操作模式，其中接收机调整其定时信号以扫描寻找导频音子符号的预定数量的频道的频率范围，并识别包括导频音子符号的音箱。 接收机还具有随后的第二导频音调获取模式，其中接收机调整定时信号以接收包含导频音符号的识别的小区，并且测量连续的导频音子符号之间的相位差，从而进一步调整 定时信号，使得在对其后续的锁相环处理足够的频率范围内接收导频音子符号。

公开(公告)号：US20100027476A1

公开(公告)日：2010-02-04

申请号：US12578247

申请日：2009-10-13

申请人： M. Scott Corson ,  Samir Kapoor ,  Rajiv Laroia ,  Vincent Park

发明人： M. Scott Corson ,  Samir Kapoor ,  Rajiv Laroia ,  Vincent Park

IPC分类号： H04W4/00

CPC分类号： H04W36/18 ,  H04W24/00 ,  H04W40/02 ,  H04W84/12

摘要： The invention described herein enables a form of downlink macro-diversity in packet-switched cellular networks. It allows packets to be selectively delivered from a network/internetwork to an end node, e.g., a wireless communication device or terminal, over a set of available link-layer connections to/from the end node, through one or more access nodes, e.g., base stations. Downlink macro-diversity is particularly important when the link-layer connections between the end node and the corresponding access node, e.g., the access links, are subject to independent or partially correlated time variations in signal strength and interference. In accordance with the invention, the end node dynamically selects the downlink to be used out of a set of available access links on a per packet basis subject to prevailing channel conditions, availability of air-link resources and other constraints. The invention improves the robustness and efficiency of communication, overall utilization of air-link resources, and quality of service experienced by the end node.

摘要翻译： 本文描述的本发明使得能够在分组交换蜂窝网络中形成下行链路宏分集。 它允许分组通过一个或多个接入节点，例如通过一组到终端节点的可用链路层连接的集合，例如，无线通信设备或终端，选择性地从网络/互联网络传送到终端节点，例如 ，基站。 当终端节点和对应的接入节点（例如接入链路）之间的链路层连接受信号强度和干扰的独立或部分相关的时间变化时，下行链路宏分集尤其重要。 根据本发明，终端节点根据主要信道条件，空中链路资源的可用性和其他约束，以每个分组的形式动态地选择要从一组可用接入链路中使用的下行链路。 本发明提高了通信的鲁棒性和效率，空中链路资源的整体利用以及终端节点所经历的业务质量。