DENIAL OF SERVICE (DoS) ATTACK PREVENTION THROUGH RANDOM ACCESS CHANNEL RESOURCE REALLOCATION
    81.
    发明申请
    DENIAL OF SERVICE (DoS) ATTACK PREVENTION THROUGH RANDOM ACCESS CHANNEL RESOURCE REALLOCATION 有权
    服务中心(DoS)通过随机访问通道资源重新进行防范

    公开(公告)号:US20120155274A1

    公开(公告)日:2012-06-21

    申请号:US12972688

    申请日:2010-12-20

    IPC分类号: H04W28/08

    CPC分类号: H04L63/1458 H04W12/12

    摘要: A system and method to substantially prevent Denial of Service (DoS) attacks due to Random Access Channel (RACH) overload in cellular wireless networks. Once a mobile handset is identified to cause or contribute significantly to a RACH overload of the cell, the system sends a special System Information Block (SIB) message targeted to that mobile handset and instructing it to redirect its RACH signaling to a separate RACH/PRACH (Physical Random Access Channel) resource or to a small part of the current RACH/PRACH resource. This allows most or all of the regular RACH/PRACH resource from being overloaded by a single user or a group of users. The use of a separate RACH/PRACH resource such as frequency, preamble sequence, and/or radio subframe access slot to “absorb” high volume RACH signaling traffic from a small number of malicious/defective mobile handsets substantially prevents the signaling DoS attacks in the wireless network and makes it more robust to such attacks.

    摘要翻译: 一种基本上防止由于蜂窝无线网络中的随机接入信道(RACH)过载引起的拒绝服务(DoS)攻击的系统和方法。 一旦移动手机被识别为小区的RACH重载导致或显着贡献,则系统发送针对该移动手机的专用系统信息块(SIB)消息,并指示其将其RACH信令重定向到单独的RACH / PRACH (物理随机访问信道)资源或当前RACH / PRACH资源的一小部分。 这允许大多数或全部常规RACH / PRACH资源被单个用户或一组用户过载。 使用诸如频率,前导码序列和/或无线电子帧接入时隙的单独的RACH / PRACH资源来从少量的恶意/有缺陷的移动手机“吸收”大容量的RACH信令业务基本上防止了信令DoS攻击 无线网络,并使其对这种攻击更加强大。

    Method and Apparatus for Impairment Correlation Estimation in a Wireless Communication Receiver
    82.
    发明申请
    Method and Apparatus for Impairment Correlation Estimation in a Wireless Communication Receiver 有权
    无线通信接收机的损伤相关估计方法与装置

    公开(公告)号:US20120027115A1

    公开(公告)日:2012-02-02

    申请号:US13253412

    申请日:2011-10-05

    IPC分类号: H04B7/02

    摘要: A wireless communication receiver improves signal impairment correlation estimation in MIMO/MISO systems by considering different transmit power allocations and different transmit antenna power distributions in its impairment correlation calculations. The receiver may be implemented in according to a variety of architectures, including, but not limited to, Successive Interference Cancellation (SIC) Generalized RAKE (G-RAKE), Joint Detection (JD) G-RAKE, and Minimum Mean Squared Error (MMSE) G-RAKE. Regardless of the particular receiver architecture adopted, the improved impairment correlations may be used to calculate improved (RAKE) signal combining weights and/or improve channel quality estimates for reporting by receivers operating in Wideband CDMA (W-CDMA) systems transmitting HSDPA channels via MIMO or MISO transmitters. A transmitter may be configured to facilitate impairment correlation determinations by wireless communication receivers operating in MIMO/MISO environments, by signaling one or more values, e.g., data-to-pilot signal transmit power ratios and/or transmit antenna power distributions for the data and pilot signals.

    摘要翻译: 无线通信接收机通过在损伤相关计算中考虑不同的发射功率分配和不同的发射天线功率分布来改善MIMO / MISO系统中的信号损害相关估计。 接收机可以根据各种架构来实现,包括但不限于连续干扰消除(SIC)广义RAKE(G-RAKE),联合检测(JD)G-RAKE和最小均方误差(MMSE) )G-RAKE。 不考虑所采用的特定接收机架构,改进的损害相关可以用于计算改进的(RAKE)信号组合权重和/或改善用于在通过MIMO发送HSDPA信道的宽带CDMA(W-CDMA)系统中操作的接收机报告的信道质量估计 或MISO发射机。 发射机可以被配置为通过信令一个或多个值(例如数据到导频信号发射功率比和/或数据的发射天线功率分布)来促进在MIMO / MISO环境中操作的无线通信接收机的损害相关确定,以及 导频信号。

    Method and apparatus for impairment correlation estimation in a wireless communication receiver
    83.
    发明授权
    Method and apparatus for impairment correlation estimation in a wireless communication receiver 有权
    无线通信接收机的损伤相关估计方法和装置

    公开(公告)号:US08045638B2

    公开(公告)日:2011-10-25

    申请号:US11449258

    申请日:2006-06-08

    IPC分类号: H04B7/02

    摘要: A wireless communication receiver improves signal impairment correlation estimation in MIMO/MISO systems by considering different transmit power allocations and different transmit antenna power distributions in its impairment correlation calculations. The receiver may be implemented in according to a variety of architectures, including, but not limited to, Successive Interference Cancellation (SIC) Generalized RAKE (G-RAKE), Joint Detection (JD) G-RAKE, and Minimum Mean Squared Error (MMSE) G-RAKE. Regardless of the particular receiver architecture adopted, the improved impairment correlations may be used to calculate improved (RAKE) signal combining weights and/or improve channel quality estimates for reporting by receivers operating in Wideband CDMA (W-CDMA) systems transmitting HSDPA channels via MIMO or MISO transmitters. A transmitter may be configured to facilitate impairment correlation determinations by wireless communication receivers operating in MIMO/MISO environments, by signaling one or more values, e.g., data-to-pilot signal transmit power ratios and/or transmit antenna power distributions for the data and pilot signals.

    摘要翻译: 无线通信接收机通过在损伤相关计算中考虑不同的发射功率分配和不同的发射天线功率分布来改善MIMO / MISO系统中的信号损害相关估计。 接收机可以根据各种架构来实现,包括但不限于连续干扰消除(SIC)广义RAKE(G-RAKE),联合检测(JD)G-RAKE和最小均方误差(MMSE) )G-RAKE。 不考虑所采用的特定接收机架构,改进的损害相关可以用于计算改进的(RAKE)信号组合权重和/或改善用于在通过MIMO发送HSDPA信道的宽带CDMA(W-CDMA)系统中操作的接收机报告的信道质量估计 或MISO发射机。 发射机可以被配置为通过信令一个或多个值(例如数据到导频信号发射功率比和/或数据的发射天线功率分布)来促进在MIMO / MISO环境中操作的无线通信接收机的损害相关确定,以及 导频信号。

    Method and apparatus for extended least squares estimation for generalized rake receiver parameters using multiple base stations
    84.
    发明授权
    Method and apparatus for extended least squares estimation for generalized rake receiver parameters using multiple base stations 有权
    用于使用多个基站的广义耙式接收机参数的扩展最小二乘估计的方法和装置

    公开(公告)号:US08040938B2

    公开(公告)日:2011-10-18

    申请号:US11609373

    申请日:2006-12-12

    IPC分类号: H04B1/00

    CPC分类号: H04B1/712 H04B2201/709727

    摘要: Exemplary combining weight generation is based on estimating received signal impairment correlations using a weighted summation of interference impairment terms, such as an interference correlation matrix associated with a transmitting base station, and a noise impairment term, such as a noise correlation matrix, the impairment terms scaled by fitting parameters. The estimate is updated based on adapting the fitting parameters responsive to measured signal impairment correlations. The interference matrices are calculated from channel estimates and delay information, and knowledge of the receive filter pulse shape. Instantaneous values of the fitting parameters are determined by fitting the impairment correlation terms to impairment correlations measured at successive time instants and the fitting parameters are adapted at each time instant by updating the fitting parameters based on the instantaneous values.

    摘要翻译: 示例性组合权重生成是基于使用干扰损害项的加权求和来估计接收到的信号损害相关性,例如与发射基站相关联的干扰相关矩阵,以及诸如噪声相关矩阵之类的噪声损害项,损伤项 通过拟合参数进行缩放。 基于对测量的信号损伤相关性的适应参数进行修改,估计更新。 干扰矩阵由信道估计和延迟信息以及接收滤波器脉冲形状的知识计算。 拟合参数的瞬时值通过将损害相关项拟合到在连续时刻测量的损伤相关性来确定,并且通过基于瞬时值更新拟合参数,在每个时刻适应拟合参数。

    CDMA receivers for the golden code
    85.
    发明授权
    CDMA receivers for the golden code 有权
    CDMA接收机为黄金代码

    公开(公告)号:US08018985B2

    公开(公告)日:2011-09-13

    申请号:US12056035

    申请日:2008-03-26

    IPC分类号: H04B1/00

    摘要: A Generalized Rake (G-Rake) receiver is adapted for Golden code reception in a CDMA system. Signals transmitted by two or more transmit antennas are received at two or more receiver antennas. The signal from each receiver antenna is despread, and channel estimation is performed for each transmit antenna. G-Rake combining weights are calculated based on impairment correlation across G-Rake fingers and channel coefficients corresponding to each transmit antenna. The despread values from each symbol period are combined over a plurality of symbol periods based on the combining weights. The combined values are processed using coefficients derived from the Golden number to generate a set of decision variables, and the Golden encoded symbols are jointly detected from the decision variables. In some embodiments, spherical decoding and triangularization significantly simplify the decoding problem formulation.

    摘要翻译: 广义耙(G-Rake)接收机适用于CDMA系统中的黄金码接收。 由两个或多个发射天线发射的信号在两个或多个接收机天线处被接收。 来自每个接收机天线的信号被解扩展,并且对于每个发射天线执行信道估计。 基于G-Rake指针和对应于每个发射天线的信道系数的损伤相关计算G-Rake组合权重。 基于组合权重,从多个符号周期组合来自每个符号周期的解扩值。 使用从黄金数字导出的系数来处理组合值以生成一组决策变量,并且从决策变量共同检测到黄金编码符号。 在一些实施例中,球面解码和三角化显着简化了解码问题公式。

    Blind Spreading Factor Detection for WCDMA
    86.
    发明申请
    Blind Spreading Factor Detection for WCDMA 有权
    WCDMA的盲目扩频因子检测

    公开(公告)号:US20110122927A1

    公开(公告)日:2011-05-26

    申请号:US12624152

    申请日:2009-11-23

    申请人: Yi-Pin Eric Wang

    发明人: Yi-Pin Eric Wang

    IPC分类号: H04B1/707

    摘要: In a blind spreading factor detecting receiver, the amplitude of a desired signal term is decoupled from the spreading factor hypothesis for that signal. Furthermore, the amplitude of the desired signal and the variance of an associated impairment term are estimated, and the estimates used to form a spreading factor hypothesis. Additionally, in one or more embodiments, a suboptimal detector does not rely on estimates of the amplitude of the desired signal or variance of the impairment term. Rather, the detector relies on scaled values that are partially despread using an initial spreading factor not greater than the smallest possible spreading factor used by the signal of interest, and combined using combining weights from a Rake or G-Rake processor, wherein the scaling factor is chosen to yield a unity ratio between the signal amplitude and noise variance after scaling.

    摘要翻译: 在盲扩频因子检测接收机中,期望信号项的幅度与该信号的扩展因子假设去耦合。 此外,估计期望信号的幅度和相关联的损伤项的方差,并且估计用于形成扩展因子假设。 另外,在一个或多个实施例中,次最佳检测器不依赖于期望信号的幅度的估计或损伤项的方差。 相反,检测器依赖于使用不大于感兴趣信号所使用的最小可能扩展因子的初始扩展因子部分去扩展的缩放值,并且使用来自耙式或耙式处理器的组合权重进行组合,其中缩放因子 被选择为在缩放之后产生信号幅度和噪声方差之间的单位比。

    Method and Apparatus for Communication Channel Error Rate Estimation
    87.
    发明申请
    Method and Apparatus for Communication Channel Error Rate Estimation 有权
    用于通信信道误码率估计的方法和装置

    公开(公告)号:US20110111790A1

    公开(公告)日:2011-05-12

    申请号:US13008523

    申请日:2011-01-18

    IPC分类号: H04B7/00

    摘要: A wireless communication device or system generates transmit power control feedback for a received power control channel by determining a command error rate (CER), or by identifying a target signal quality for the power control channel according to a defined signal-quality-to-CER mapping function. Generally, the power control channel does not include error-coded data to use for CER estimation. However, in one embodiment, the channel does include known reference bits that are evaluated for CER estimation, with the estimated CER used to set the signal quality target for inner loop power control. In other embodiments, a computed reception error probability is used to identify a CER estimate according to a defined probability-to-CER mapping function. By way of non-limiting example, these embodiments may be used to provide power control feedback for power control commands transmitted on a Fractional Dedicated Physical Channel in WCDMA systems.

    摘要翻译: 无线通信设备或系统通过确定命令错误率(CER)或者通过根据定义的信号质量到CER来识别功率控制信道的目标信号质量来为接收到的功率控制信道生成发射功率控制反馈 映射功能。 通常,功率控制信道不包括用于CER估计的错误编码数据。 然而,在一个实施例中,信道确实包括对CER估计进行评估的已知参考比特,其中估计的CER用于设置用于内环功率控制的信号质量目标。 在其他实施例中,使用计算的接收错误概率来根据所定义的概率到CER映射函数来识别CER估计。 作为非限制性示例,这些实施例可以用于为在WCDMA系统中的分数专用物理信道上发送的功率控制命令提供功率控制反馈。

    Method and Apparatus for Generating Channel Quality Information for Wireless Communication
    88.
    发明申请
    Method and Apparatus for Generating Channel Quality Information for Wireless Communication 审中-公开
    用于生成无线通信信道质量信息的方法和装置

    公开(公告)号:US20110105046A1

    公开(公告)日:2011-05-05

    申请号:US13005195

    申请日:2011-01-12

    IPC分类号: H04B17/00

    摘要: A method and apparatus for generating channel quality information, such as may be used for transmit link adaptation, provide different operating modes, such as a first mode that may be used when propagation channel estimates are not reliable, and a second mode that may be used when the propagation channel estimates are reliable. In one or more embodiments, channel quality information is generated using receiver performance information that characterizes receiver performance in terms of a defined channel quality metric, e.g., supported data rates, for different values of receiver input signal quality over a range of propagation channel realizations. Channel quality information can be generated by selecting channel quality metrics according to receiver input signal quality and a desired probability of meeting a defined performance requirement over a range of propagation channel realizations, or by selecting channel quality metrics according to receiver input signal quality and particularized propagation channel realizations.

    摘要翻译: 用于产生信道质量信息的方法和装置,例如可以用于发送链路自适应,提供不同的操作模式,例如当传播信道估计不可靠时可以使用的第一模式,以及可以使用的第二模式 当传播信道估计是可靠的。 在一个或多个实施例中,使用接收机性能信息来生成信道质量信息,所述接收机性能信息根据定义的信道质量度量(例如,支持的数据速率),在传播信道实现范围内针对接收机输入信号质量的不同值来表征接收机性能。 可以通过根据接收机输入信号质量选择信道质量度量并且在传播信道实现范围内满足定义的性能要求的期望概率,或者通过根据接收机输入信号质量和特定传播选择信道质量度量来生成信道质量信息 渠道实现。

    METHOD AND APPARATUS FOR DETECTING A PLURALITY OF SYMBOL BLOCKS
    89.
    发明申请
    METHOD AND APPARATUS FOR DETECTING A PLURALITY OF SYMBOL BLOCKS 有权
    用于检测符号块大小的方法和装置

    公开(公告)号:US20110075767A1

    公开(公告)日:2011-03-31

    申请号:US12568036

    申请日:2009-09-28

    IPC分类号: H04L27/06

    摘要: Teachings presented herein offer reduced computational complexity for detecting a plurality of symbol blocks, even for symbol blocks that comprise the combination of a relatively large number of symbols. The teachings perform two or more stages of detection assistance to successively reduce the number of candidate combinations of symbols to be considered for a symbol block when detecting the plurality of symbol blocks. In particular, the teachings identify a reduced set of candidate symbol combinations for at least one symbol block in the plurality of symbol blocks, and then jointly detect each of one or more distinct groups of symbols in the symbol block to determine from that reduced set a final reduced set of candidate symbol combinations. Detection of the plurality of symbol blocks limits the candidate combinations of symbols considered for a symbol block to the final reduced set of candidate symbol combinations identified for that symbol block.

    摘要翻译: 本文中提供的教学提供了用于检测多个符号块的减少的计算复杂度,即使对于包括相对大量符号的组合的符号块也是如此。 该教导执行检测辅助的两个或多个阶段,以便在检测到多个符号块时,连续地减少要用于符号块的符号候选组合的数量。 具体地,教导识别多个符号块中的至少一个符号块的候选符号组合的缩减集合,然后共同检测符号块中的一个或多个不同符号组中的每个,以从该缩减集合a 候选符号组合的最终缩减集合。 多个符号块的检测将针对符号块考虑的符号的候选组合限制为为该符号块识别的候选符号组合的最终缩减集合。

    Robust multicode detector for HSDPA
    90.
    发明授权
    Robust multicode detector for HSDPA 有权
    用于HSDPA的强大的多码检测器

    公开(公告)号:US07873098B2

    公开(公告)日:2011-01-18

    申请号:US11739126

    申请日:2007-04-24

    IPC分类号: H04B1/00

    摘要: Detecting a symbol of interest comprises despreading a received signal to obtain despread values corresponding to the symbol of interest and to one or more interfering symbols, combining the despread values to generate combined values for the symbol of interest and the interfering symbols, computing spreading waveform correlations between the spreading waveform for the symbol of interest and the spreading waveforms for the interfering symbols, computing interference rejection terms representing the interference present in the combined value for the symbol of interest attributable to the interfering symbols based on the spreading waveform correlations, and generating an estimate of the symbol of interest by combining the combined values with the interference rejection terms. The interference rejection terms are computed by scaling the spreading waveform correlations by corresponding signal powers and compensating the estimates for noise. This provides a robust interference model that avoids numerical problems associated with conventional joint detection.

    摘要翻译: 检测感兴趣的符号包括解扩接收信号以获得对应于感兴趣符号的解扩值和一个或多个干扰符号,组合解扩值以产生感兴趣符号和干扰符号的组合值,计算扩展波形相关性 在感兴趣符号的扩展波形和干扰符号的扩展波形之间,基于扩展波形相关性计算代表归因于干扰符号的感兴趣符号的组合值中存在的干扰的干扰抑制项, 通过将组合值与干扰抑制项组合来估计感兴趣的符号。 通过相应的信号功率缩放扩展波形相关性并补偿噪声的估计来计算干扰抑制项。 这提供了一个强大的干扰模型,可以避免与常规关节检测相关的数值问题。