公开(公告)号：EP2198654A1

公开(公告)日：2010-06-23

申请号：EP08832562.6

申请日：2008-09-17

申请人： QUALCOMM Incorporated

发明人： AMERGA, Messay ,  CHAWLA, Vivek ,  GARG, Deepali

IPC分类号： H04W48/16

CPC分类号： H04W48/16 ,  H04W52/0229 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/24

摘要： A method and apparatus for reducing frequency space from code space search is disclosed in a wireless network. The method and apparatus reduces the frequency space without compromising the probability of detection, so that user equipment can expedite system acquisition and reduce power consumption. To reduce the frequency space, the described aspects note that the power spectral density of the WCDMA signal is essentially flat within the channel bandwidth. By capturing in-phase quadrature samples and doing frequency domain analysis of the signal in bandwidth around the center frequency, to the described aspects can eliminate some channels from the WCDMA code space search during frequency scan.

公开(公告)号：EP3524019A1

公开(公告)日：2019-08-14

申请号：EP17857858.9

申请日：2017-10-05

申请人： QUALCOMM Incorporated

发明人： LI, Gaoshan ,  RU, Congchong ,  YAN, Hongbo ,  SONG, Wei-Jei ,  CHIN, Tom ,  CHAWLA, Vivek

IPC分类号： H04W52/14

公开(公告)号：EP2092771A1

公开(公告)日：2009-08-26

申请号：EP07844611.9

申请日：2007-10-25

申请人： QUALCOMM Incorporated

发明人： UMATT, Bhupesh Manoharlal ,  MITTAL, Vineet ,  CHAWLA, Vivek

IPC分类号： H04Q7/32

CPC分类号： H04W52/0241 ,  H04W48/16 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/1262

摘要： Techniques for performing uniform out-of-service (UOOS) search to detect for wireless systems are described. The UOOS search is uniform in that sleep cycle and/or awake period are fixed. A wireless device transitions to an OOS state upon detection of OOS conditions for a radio access technology (RAT). The wireless device performs system search during the awake period of each sleep cycle while in the OOS state. The awake period may have a first fixed time duration, and the sleep cycle may have a second fixed time duration. In each awake period, the wireless device may either start a new search or resume a prior search based on saved state information if the search was not completed in a prior awake period. In each awake period, the wireless device may (i) start and complete a search for recently acquired frequency channels and systems and (ii) start or resume a search for other frequency channels and systems in one or more RATs.

摘要翻译： 描述了用于执行统一的无服务（UOOS）搜索以检测无线系统的技术。 UOOS搜索在该睡眠周期中是一致的，和/或清醒期是固定的。 检测到无线电接入技术（RAT）的OOS条件时，无线设备转换到OOS状态。 无线设备在处于OOS状态的每个休眠周期的唤醒期间执行系统搜索。 清醒周期可以具有第一固定持续时间，并且睡眠周期可以具有第二固定持续时间。 在每个清醒周期中，如果在之前的清醒周期内没有完成搜索，则无线设备可以基于保存的状态信息来开始新的搜索或恢复先前的搜索。 在每个清醒周期中，无线设备可以（i）开始并完成对最近获取的频道和系统的搜索，以及（ii）开始或恢复对一个或多个RAT中的其他频道和系统的搜索。

公开(公告)号：EP3785471A1

公开(公告)日：2021-03-03

申请号：EP18916015.3

申请日：2018-04-23

申请人： Qualcomm Incorporated

发明人： LI, Gaoshan ,  MAO, Jie ,  CHAWLA, Vivek ,  RU, Congchong ,  KANG, Insung ,  GOROKHOV, Alexei, Yurievitch ,  HE, Linhai

IPC分类号： H04W52/04

公开(公告)号：EP2092771B1

公开(公告)日：2018-06-27

申请号：EP07844611.9

申请日：2007-10-25

申请人： QUALCOMM Incorporated

发明人： UMATT, Bhupesh Manoharlal ,  MITTAL, Vineet ,  CHAWLA, Vivek

IPC分类号： H04W88/02

CPC分类号： H04W52/0241 ,  H04W48/16 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142

摘要： Techniques for performing uniform out-of-service (UOOS) search to detect for wireless systems are described. The UOOS search is uniform in that sleep cycle and/or awake period are fixed. A wireless device transitions to an OOS state upon detection of OOS conditions for a radio access technology (RAT). The wireless device performs system search during the awake period of each sleep cycle while in the OOS state. The awake period may have a first fixed time duration, and the sleep cycle may have a second fixed time duration. In each awake period, the wireless device may either start a new search or resume a prior search based on saved state information if the search was not completed in a prior awake period. In each awake period, the wireless device may (i) start and complete a search for recently acquired frequency channels and systems and (ii) start or resume a search for other frequency channels and systems in one or more RATs.

公开(公告)号：EP2198654B1

公开(公告)日：2017-05-31

申请号：EP08832562.6

申请日：2008-09-17

申请人： QUALCOMM Incorporated

发明人： AMERGA, Messay ,  CHAWLA, Vivek ,  GARG, Deepali

IPC分类号： H04W48/16 ,  H04W52/02

CPC分类号： H04W48/16 ,  H04W52/0229 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/24

摘要： A method and apparatus for reducing frequency space from code space search is disclosed in a wireless network. The method and apparatus reduces the frequency space without compromising the probability of detection, so that user equipment can expedite system acquisition and reduce power consumption. To reduce the frequency space, the described aspects note that the power spectral density of the WCDMA signal is essentially flat within the channel bandwidth. By capturing in-phase quadrature samples and doing frequency domain analysis of the signal in bandwidth around the center frequency, to the described aspects can eliminate some channels from the WCDMA code space search during frequency scan.

摘要翻译： 在无线网络中公开了一种用于从代码空间搜索中减少频率空间的方法和装置。 该方法和装置在不损害检测概率的情况下减少了频率空间，使得用户设备可以加速系统采集并降低功耗。 为了减少频率空间，所描述的方面注意到WCDMA信号的功率谱密度在信道带宽内基本上是平坦的。 通过捕获同相正交样本并对中心频率周围的带宽中的信号进行频域分析，对于所描述的方面可以在频率扫描期间从WCDMA码空间搜索中消除一些信道。

公开(公告)号：EP1932310A2

公开(公告)日：2008-06-18

申请号：EP06814948.3

申请日：2006-09-15

申请人： Qualcomm Incorporated

发明人： SUBRAHMANYA, Parvathanathan ,  SHESHADRI, Thejaswi, Bharadwaj, Madapushi ,  CHAWLA, Vivek

IPC分类号： H04L27/227

CPC分类号： H04L27/2278 ,  H04B1/7085 ,  H04B2201/70709 ,  H04L2027/003 ,  H04L2027/0034 ,  H04L2027/0065 ,  H04W52/0229 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/166 ,  Y02D70/24 ,  Y02D70/40

摘要： Quick frequency tracking (QFT), quick time tracking (QTT), and non-causal pilot filtering (NCP) are used to detect sporadically transmitted signaling, e.g., paging indicators. For QFT, multiple hypothesized frequency errors are applied to an input signal to obtain multiple rotated signals. The energies of the rotated signals are computed. The hypothesized frequency error with the largest energy is provided as a frequency error estimate. For QTT, coherent accumulation is performed on the input signal for a first set of time offsets, e.g., early, on-time, and late. Interpolation, energy computation, and non-coherent accumulation are then performed to obtain a timing error estimate with higher time resolution. For NCP, pilot symbols are filtered with a non-causal filter to obtain pilot estimates for one antenna for non-STTD and for two antennas for STTD. The frequency and timing error estimates and the pilot estimates are used to detect the signaling.

摘要翻译： 使用快速频率跟踪（QFT），快速时间跟踪（QTT）和非因果导频滤波（NCP）来检测偶发地发送的信令，例如寻呼指示符。 对于QFT，将多个假设的频率误差应用于输入信号以获得多个旋转信号。 计算旋转信号的能量。 提供具有最大能量的假设频率误差作为频率误差估计。 对于QTT，对于第一组时间偏移的输入信号执行相干累加，例如，早期，准时和晚期。 然后执行插值，能量计算和非相干累加，以获得具有较高时间分辨率的定时误差估计。 对于NCP，使用非因果滤波器对导频符号进行滤波，以获得非STTD的一个天线和STTD的两个天线的导频估计。 频率和定时误差估计和导频估计用于检测信令。