公开(公告)号：US20100002614A1

公开(公告)日：2010-01-07

申请号：US12483652

申请日：2009-06-12

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: G08C17/02

CPC classification number: H04W88/08 ,  H04W52/0206 ,  H04W52/244 ,  H04W52/287 ,  H04W52/322 ,  H04W52/325 ,  H04W84/045 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/23

Abstract: Devices and methods are provided for deploying and/or implementing a low power mode in an access point (AP) base station. The low power mode may be implemented based on the presence and/or status of access terminals (ATs). In one embodiment, the method may involve determining whether any ATs are present within at least one defined coverage area. In another embodiment, the method may involve determining whether the ATs are in an idle or active state.

Abstract translation: 提供了用于在接入点（AP）基站中部署和/或实现低功率模式的设备和方法。 低功率模式可以基于接入终端（AT）的存在和/或状态来实现。 在一个实施例中，该方法可以包括确定在至少一个定义的覆盖区域内是否存在任何AT。 在另一个实施例中，该方法可以涉及确定AT是处于空闲还是活动状态。

公开(公告)号：US07430191B2

公开(公告)日：2008-09-30

申请号：US09950744

申请日：2001-09-10

Applicant: Parvathanathan Subrahmanya ,  Andrew Sendonaris

Inventor： Parvathanathan Subrahmanya ,  Andrew Sendonaris

IPC: H04B7/216

CPC classification number: H04L27/2332 ,  H04B2201/70701 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0081 ,  H04L2027/0087

Abstract: Techniques to acquire and track a received signal instance (or multipath) based on one or more transmitted pilots. In an aspect, a frequency tracking loop is provided to acquire and track the multipath, and supports a number of loop modes (e.g., acquisition and tracking modes). Each loop mode may be associated with a respective frequency detector and a set of values for a set of elements in the loop. In another aspect, several frequency detectors are provided for deriving estimates of the frequency error in the downconversion of the multipath (e.g., from radio frequency to baseband). In one design, maximum likelihood estimates of the frequency error are derived based on the recovered pilot symbols. In another design, the frequency error estimates for the multipath are derived based on the frequency error estimated for each transmitted signal.

Abstract translation: 基于一个或多个发射的导频获取和跟踪接收到的信号实例（或多路径）的技术。 在一方面，提供频率跟踪环以获取和跟踪多路径，并且支持多种环路模式（例如，采集和跟踪模式）。 每个循环模式可以与相应的频率检测器和一组循环中的元件的值相关联。 在另一方面，提供了几个频率检测器用于导出多路径下变频（例如，从射频到基带）中的频率误差的估计。 在一种设计中，基于恢复的导频符号导出频率误差的最大似然估计。 在另一种设计中，基于针对每个发射信号估计的频率误差导出多路径的频率误差估计。

公开(公告)号：US20070230544A1

公开(公告)日：2007-10-04

申请号：US11761329

申请日：2007-06-11

Applicant: Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Avneesh Agrawal

Inventor： Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Avneesh Agrawal

IPC: H04B1/00 ,  H04B1/10 ,  H04B1/707

CPC classification number: H04L25/0228 ,  H04B1/7117 ,  H04B2201/70701 ,  H04L25/0214

Abstract: Techniques to filter pilot symbols for a pilot in an “adaptive” manner to provide an improved estimate of the response of a communication channel. A received signal may experience different channel conditions at different times, and different multipaths may also experience different channel conditions even when received close in time. A pilot filter with an adaptive response is used to provide an improved estimate of the channel response. Various adaptive pilot filtering schemes may be used. In a first scheme, the channel conditions are estimated based on the quality of the received pilot. In a second scheme, the channel conditions are estimated based on the quality of the pilot estimates (i.e., the filtered pilot symbols). For each scheme, a particular filter response is selected based on the estimated quality of either the received pilot or the pilot estimates.

Abstract translation: 用于以“自适应”方式滤波导频的导频符号以提供对通信信道的响应的改进估计的技术。 接收到的信号可能在不同时间经历不同的信道条件，即使在接收时间短的情况下，不同的多路径也可能经历不同的信道条件。 使用具有自适应响应的导频滤波器来提供信道响应的改进的估计。 可以使用各种自适应导频滤波方案。 在第一方案中，基于接收到的导频的质量来估计信道条件。 在第二方案中，基于导频估计的质量（即，滤波的导频符号）来估计信道条件。 对于每个方案，基于所接收的导频或导频估计的估计质量来选择特定的滤波器响应。

公开(公告)号：US07006557B2

公开(公告)日：2006-02-28

申请号：US10061873

申请日：2002-01-31

Applicant: Parvathanathan Subrahmanya ,  Kevin J. Clark

Inventor： Parvathanathan Subrahmanya ,  Kevin J. Clark

IPC: H04B1/69

CPC classification number: H04B1/7085 ,  H04B7/0613 ,  H04B2201/70701 ,  Y02D70/40 ,  Y02D70/444

Abstract: Techniques for time tracking diversity pilots are disclosed. In one aspect, an early and a late energy calculation is made on each incoming symbol using a first pilot sequence for despreading. The difference between the two energies is used to drive a tracking loop, which generates a time reference for producing a first pilot estimate and a second pilot estimate, the two estimates used for demodulating data. In another aspect, the early and late energies are made including a plurality of incoming symbols, the number of which corresponds to the number of symbols in a run of positive or negative values in an orthogonalizing sequence. The orthogonalizing sequence is used to generate a second pilot sequence from a first pilot sequence, the resulting second pilot sequence being orthogonal to the first. These aspects have the benefit of simplifying the hardware or processing steps required for transmit diversity time tracking, resulting in cost savings, power savings, simplicity of design, and the like.

公开(公告)号：US20050276248A1

公开(公告)日：2005-12-15

申请号：US10875107

申请日：2004-06-09

Applicant: Amit Butala ,  Parvathanathan Subrahmanya ,  Hyukjun Oh

Inventor： Amit Butala ,  Parvathanathan Subrahmanya ,  Hyukjun Oh

IPC: H04B7/005 ,  H04L1/20 ,  H04B7/212

CPC classification number: H04W52/04 ,  H04L1/20 ,  H04L1/201 ,  H04W52/12 ,  H04W52/16 ,  H04W52/20 ,  H04W52/287 ,  H04W52/362 ,  H04W52/44

Abstract: Erasure detection and power control are performed for an intermittently active transport channel with unknown format. A receiver processes each received block and determines whether it passes or fails CRC. For each received block with CRC failure, the receiver performs erasure detection by computing a symbol error rate (SER) and energy of the received block, comparing the computed SER against an SER threshold, comparing the computed energy against an energy threshold, and declaring an erasure if the computed SER is less than the SER threshold and the computed energy exceeds the energy threshold. The SER and energy thresholds may be adjusted based on the average SER and the average energy for prior received blocks with CRC failures. For power control, an SIR target is increased by an UP step whenever an erased block is detected for the transport channel.

Abstract translation: 对具有未知格式的间歇活动的传输信道执行擦除检测和功率控制。 接收器处理每个接收的块并确定其是否通过或失败CRC。 对于每个具有CRC故障的接收块，接收机通过计算接收块的符号错误率（SER）和能量来执行擦除检测，将计算的SER与SER阈值进行比较，将计算出的能量与能量阈值进行比较，并且声明 如果计算的SER小于SER阈值并且计算的能量超过能量阈值，则擦除。 可以基于具有CRC故障的先前接收的块的平均SER和平均能量来调整SER和能量阈值。 对于功率控制，每当检测到用于传输信道的擦除块时，SIR目标通过UP步增加。

公开(公告)号：US08913587B2

公开(公告)日：2014-12-16

申请号：US13111114

申请日：2011-05-19

Applicant: Dilip Krishnaswamy ,  Parvathanathan Subrahmanya

Inventor： Dilip Krishnaswamy ,  Parvathanathan Subrahmanya

IPC: H04W4/00 ,  G08C17/00 ,  H04W36/00 ,  H04M1/00 ,  H04W84/00 ,  H04W8/26 ,  H04W88/04 ,  H04W88/02 ,  H04W88/06

CPC classification number: H04W36/00 ,  H04M1/006 ,  H04W8/26 ,  H04W84/005 ,  H04W88/02 ,  H04W88/04 ,  H04W88/06

Abstract: Aspects describe infrastructure unassisted inter-device handoff. A method performed by a wireless communications apparatus for inter-device handoff is disclosed. A wireless communications apparatus that performs a network unassisted inter-device handoff is disclosed. A computer program product comprising a computer-readable medium that includes codes for carrying out inter-device handoff is disclosed. At least one processor configured to perform a network unassisted communication handoff is disclosed.

Abstract translation: 方面描述了基础设施无协调的设备间切换。 公开了一种由用于设备间切换的无线通信装置执行的方法。 公开了一种执行网络非辅助设备间切换的无线通信装置。 公开了一种计算机程序产品，其包括包括用于执行设备间切换的代码的计算机可读介质。 公开了至少一个被配置为执行网络非辅助通信切换的处理器。

公开(公告)号：US08620357B2

公开(公告)日：2013-12-31

申请号：US13331034

申请日：2011-12-20

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: H04W68/02

CPC classification number: H04W68/00 ,  H04W52/0216 ,  Y02D70/00

Abstract: A wireless communications network (120) responds to each incoming call placed to a wireless communications device (134) by transmitting a call-paging message (418) within a corresponding partition of a digital radio frame of prescribed format. Responsive to each occurrence of a broadcast event (404), the network transmits (414) a repeating broadcast-paging message announcing the availability of broadcast content from the network. The broadcast-paging message is transmitted multiple times within each digital radio frame. Another sequence (500) describes WCD operation in this network. Responsive to wakeup (502) from sleep, the WCD detects (509) received signal quality. The WCD also receives (510) scheduled network transmission of a call-paging message and a number of instances (at least one) of a repeating network transmitted broadcast-paging message that occurs multiple times for each scheduled transmission of the call-paging message. This number varies inversely with the detected signal quality.

公开(公告)号：US08477888B2

公开(公告)日：2013-07-02

申请号：US12145322

申请日：2008-06-24

Applicant: Feng Lu ,  Prashant Udupa Sripathi ,  Liang Zhao ,  Parvathanathan Subrahmanya ,  Subramanya P. Rao

Inventor： Feng Lu ,  Prashant Udupa Sripathi ,  Liang Zhao ,  Parvathanathan Subrahmanya ,  Subramanya P. Rao

IPC: H03D1/04

CPC classification number: H04W52/245 ,  H04B17/345 ,  H04L1/0026 ,  H04L1/20 ,  H04W52/241 ,  H04W52/243

Abstract: System(s) and method(s) are provided for generating phase-noise resilient channel quality indicator(s). A pilot signal utilized to determine a channel quality indicator is rotated to be aligned to a phase reference signal. Separate noise evaluations in quadrature and in-phase directions are utilized, at least in part, to generate a net noise estimate that is phase-noise compensated or resilient. For example, various combination schemes of quadrature and in-phase noise evaluations can be exploited to generate a net noise estimate, the schemes include weighted average of in-phase and quadrature noise estimates and running averages thereof. Simulation of net noise estimates as a function of geometry conditions reveal that the combination schemes provide substantive mitigation of phase-noise, thus making CQI generation phase-noise resilient.

Abstract translation: 提供了用于产生相位噪声弹性信道质量指示符的系统和方法。 用于确定信道质量指示符的导频信号被旋转以与相位参考信号对准。 至少部分地利用正交和同相方向上的独立噪声评估来产生相位噪声补偿或弹性的净噪声估计。 例如，可以利用正交和同相噪声评估的各种组合方案来产生净噪声估计，该方案包括同相和正交噪声估计的加权平均值及其运行平均值。 作为几何条件的函数的净噪声估计的模拟表明，组合方案提供了相位噪声的实质性减轻，从而使得CQI生成相位噪声具有弹性。

公开(公告)号：US08477742B2

公开(公告)日：2013-07-02

申请号：US12772792

申请日：2010-05-03

Applicant: Francesco Grilli ,  Charles E. Wheatley, III ,  Serge Willenegger ,  Parvathanathan Subrahmanya

Inventor： Francesco Grilli ,  Charles E. Wheatley, III ,  Serge Willenegger ,  Parvathanathan Subrahmanya

IPC: H04W56/00

CPC classification number: H04W56/002 ,  H04B7/2668 ,  H04B2201/70702 ,  H04W56/001 ,  H04W56/0015 ,  H04W56/0045 ,  H04W92/20

Abstract: Schemes to time-align transmissions from multiple base stations to a terminal. To achieve time-alignment, differences between the arrival times of transmissions from the base stations, as observed at the terminal, are determined and provided to the system and used to adjust the timing at the base stations such that terminal-specific radio frames arrive at the terminal within a particular time window. In one scheme, a time difference between two base stations is partitioned into a frame-level time difference and a chip-level time difference. Whenever requested to perform and report time difference measurements, the terminal measures the chip-level timing for each candidate base station relative to a reference base station. Additionally, the terminal also measures the frame-level timing and includes this information in the time difference measurement only if required. Otherwise, the terminal sets the frame-level part to a predetermined value (e.g., zero).

公开(公告)号：US20120294275A1

公开(公告)日：2012-11-22

申请号：US13111114

申请日：2011-05-19

Applicant: Dilip Krishnaswamy ,  Parvathanathan Subrahmanya

Inventor： Dilip Krishnaswamy ,  Parvathanathan Subrahmanya

IPC: H04W4/00

CPC classification number: H04W36/00 ,  H04M1/006 ,  H04W8/26 ,  H04W84/005 ,  H04W88/02 ,  H04W88/04 ,  H04W88/06

Abstract: Aspects describe infrastructure unassisted inter-device handoff. A method performed by a wireless communications apparatus for inter-device handoff is disclosed. A wireless communications apparatus that performs a network unassisted inter-device handoff is disclosed. A computer program product comprising a computer-readable medium that includes codes for carrying out inter-device handoff is disclosed. At least one processor configured to perform a network unassisted communication handoff is disclosed.

Abstract translation: 方面描述了基础设施无协调的设备间切换。 公开了一种由用于设备间切换的无线通信装置执行的方法。 公开了一种执行网络非辅助设备间切换的无线通信装置。 公开了一种计算机程序产品，其包括包括用于执行设备间切换的代码的计算机可读介质。 公开了至少一个被配置为执行网络非辅助通信切换的处理器。