公开(公告)号：WO2003073638A1

公开(公告)日：2003-09-04

申请号：PCT/US2003/006329

申请日：2003-02-27

Applicant: QUALCOMM, INCORPORATED

Inventor： TEAGUE, Edward Harrison ,  AMERGA, Messay ,  LIN, Jeremy ,  SHIU, Da-shan

IPC: H04B1/707

CPC classification number: H04B1/7117

Abstract: Techniques for tracking closely spaced multipath and preventing finger merge without monitoring relative positions between each of a plurality of fingers are disclosed. In one aspect, motion limits are determined for each finger. Time-tracking commands that would move the position of a finger outside its respective motion limits are suppressed. In another aspect, motion limits are updated dynamically, the motion limits of each finger determined in accordance with the motion limits of fingers adjacent to it. Various other aspects are also presented. These aspects have the benefit of preventing finger merge, which allows the allocation of multiple fingers to closely spaced multipath, thus increasing performance and system capacity, and mitigating misallocation of system resources.

Abstract translation: 公开了用于跟踪紧密间隔的多路径并防止手指合并而不监视多个手指之间的相对位置的技术。 在一个方面，为每个手指确定运动限制。 可以抑制将手指位置移动超过其各自运动极限的时间跟踪命令。 在另一方面，运动限制被动态地更新，每个手指的运动限制根据与其相邻的手指的运动限制确定。 还提出了各种其他方面。 这些方面具有防止手指合并的优点，这允许将多个指状物分配到紧密间隔的多路径，从而提高性能和系统容量，并减轻系统资源的未分配。

公开(公告)号：WO2003040746A3

公开(公告)日：2003-05-15

申请号：PCT/US2002/035273

申请日：2002-11-01

Applicant: QUALCOMM INCORPORATED

Inventor： RICK, Roland, R. ,  STEIN, Jeremy, M. ,  AMERGA, Messay ,  FERNANDEZ-CORBATON, Ivan

IPC: G01S1/04

Abstract: A method of producing a reliability metric for a parameter estimate derived from a signal using correlation analysis is described. The method begins by obtaining an indication of whether a non line of sight signal condition is present or likely. Responsive to one or both of these indications, the method derives a reliability metric for the parameter estimate. In one embodiment, the parameter estimate is an estimate of time of arrival (TOA) of the signal, and the reliability metric is root mean square error (RMSE) of the time of arrival estimate. This embodiment obtains an indication of whether a non line of sight signal condition is present or likely based on a measure of the strength of the correlation function at the peak thereof. The measure of the strength of the correlation function at the peak thereof may be energy per chip divided by total received power (E c /I 0 ) or may simply be the raw energy of the correlation function at the peak. The RMSE metric which is computed in this embodiment varies inversely with the peak strength of the correlation function.

公开(公告)号：WO2002059638A2

公开(公告)日：2002-08-01

申请号：PCT/US2001/045458

申请日：2001-11-14

Applicant: QUALCOMM INCORPORATED

Inventor： AMERGA, Messay ,  PATRICK, Christopher ,  RICK, Roland ,  ROWITCH, Douglas, N. ,  YOUNIS, Saed

IPC: G01S5/02

CPC classification number: H04W64/00 ,  G01S5/0273 ,  G01S19/06 ,  G01S19/46 ,  H04B7/2606

Abstract: Techniques to detect whether or not a remote terminal is under the coverage of a repeater within a wireless communication network, which may be based on (1) a list of base stations expected to be received while under the repeater's coverage, (2) the characterized environment of the repeater, and/or (3) the propagation delays for a transmission received at the remote terminal. Additional ambiguity resulting from being under a repeater's coverage may also be accounted for and/or compensated by (1) discarding time measurements from repeated base stations, (2) adjusting the processing for position estimation to account for the additional ambiguity due to the repeater, (3) computing a series of position estimates based on multiple transmissions received from the same originating base station and selecting the best estimate, and/or (4) computing a series of position estimates based on multiple transmissions from multiple originating base stations and selecting the best estimate.

Abstract translation: 检测远程终端是否在无线通信网络内的中继器的覆盖范围内的技术，其可以基于（1）预期在中继器的覆盖范围内被接收的基站的列表，（2）特征 中继器的环境，和/或（3）在远程终端接收的传输的传播延迟。 由于处于转发器覆盖范围之外的附加歧义也可以通过（1）从重复的基站中丢弃时间测量来解释和/或补偿，（2）调整位置估计的处理以解决由于中继器引起的额外的模糊性， （3）基于从相同始发基站接收的多个传输并选择最佳估计来计算一系列位置估计，和/或（4）基于来自多个发起基站的多个传输来计算一系列位置估计，并且选择 最好的估计。

公开(公告)号：EP1994781B1

公开(公告)日：2019-11-13

申请号：EP07757838.3

申请日：2007-03-02

Applicant: QUALCOMM Incorporated

Inventor： BHATTACHARJEE, Supratik ,  AMERGA, Messay ,  DONG, Brian ,  SINGH, Gurdeep

IPC: H04W24/10

公开(公告)号：EP2345171A1

公开(公告)日：2011-07-20

申请号：EP09793076.2

申请日：2009-09-28

Applicant: QUALCOMM Incorporated

Inventor： DONG, Brian ,  AMERGA, Messay ,  BHATTACHARJEE, Supratik ,  ZHU, Xiaoming

IPC: H04B1/707

CPC classification number: H04B1/7083 ,  H04B1/70735 ,  H04B1/70753 ,  H04B1/70758 ,  H04B2201/70702 ,  H04W36/30 ,  H04W48/16

Abstract: Cell timing is detected by first trying to detect a target handover cell through detecting a primary synchronization channel (P-SCH) followed by a common pilot channel (CPICH). If that fails, N number of retrials is performed using a full-window search on the CPICH. The full-window CPICH search is performed blindly, without any slot timing information from the P-SCH. Performance is improved while maintaining the benefits of faster acquisition methods in good channel conditions. The full-window search is more time consuming, but takes advantage of the stronger CPICH transmission. In good channel conditions, a mobile device can proceed quickly with the normal method of timing acquisition. With failure, the mobile device can switch to the longer search which has a higher probability of successfully completing the hard handover procedure. The overall effect is a higher success rate of hard handovers without a uniform increase of time spent in cell timing acquisition.

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

Applicant: QUALCOMM Incorporated

Inventor： AMERGA, Messay ,  CHAWLA, Vivek ,  GARG, Deepali

IPC: H04W48/16

CPC classification number: H04W48/16 ,  H04W52/0229 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/24

Abstract: 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：EP1929808A2

公开(公告)日：2008-06-11

申请号：EP06813534.2

申请日：2006-08-18

Applicant: Qualcomm Incorporated

Inventor： UMATT, Bhupesh Manoharlal ,  AMERGA, Messay ,  MITTAL, Vineet

IPC: H04Q7/32

CPC classification number: H04W48/16

Abstract: Techniques for efficiently performing system search to obtain service from a wireless system as quickly as possible are described. A terminal initially looks for service from a first (e.g., W-CDMA) system. The terminal identifies network(s) in the first system from which service was received in the past and performs acquisition on each network to look for service. If service is not found for the first system, then the terminal performs a search for a second (e.g., GSM) system. If service is found on the second system, then the terminal obtains service from the second system and avoids a frequency scan for the first system. Otherwise, the terminal performs a frequency scan for the first system using the search results for the second system. The terminal may obtain a list of RF channels detected for the second system and may omit these RF channels and possibly some other RF channels around these RF channels from the frequency scan.

公开(公告)号：EP1504540B1

公开(公告)日：2008-03-26

申请号：EP03728999.8

申请日：2003-05-15

Applicant: QUALCOMM INCORPORATED

Inventor： AMERGA, Messay ,  RICK, Roland

IPC: H04B1/707

CPC classification number: H04B1/7085 ,  G01S5/0215 ,  G01S5/0273 ,  G01S19/22 ,  G01S19/428 ,  H04B1/70757 ,  H04B1/7117

Abstract: A system and method to reduce-the effects of TOA errors. A mobile unit, generates a correlation pulse when a signal transmitted from a base station is detected. The transmitted signal may be reflected or defracted such that multipath signals arrive at the mobile unit, leading to distortion in the generated correlation pulse and errors in accurate TOA measurements. The system models the response function and calculates the width of the pulse using the modeling function with a dynamically adjustable factor to indicate at what point down from the peak the pulse width will be calculated. Based on calculation of pulse width, a type of multipath signal may be determined and an appropriate correction factor applied to the measured TOA to provide a more accurate TOA determination. The system may apply correction factors to TOA signals from base stations in a mobile telephone unit or from signals received from GPS satellites.

公开(公告)号：EP1454161A2

公开(公告)日：2004-09-08

申请号：EP02792387.9

申请日：2002-12-12

Applicant: QUALCOMM Incorporated

Inventor： RICK, Roland, R. ,  STEIN, Jeremy ,  AMERGA, Messay ,  FERNANDEZ-CORBATON, Ivan ,  RISTIC, Borislav ,  BHATIA, Ashok

IPC: G01S5/14

CPC classification number: H04W64/00 ,  G01S5/0257 ,  G01S19/48

Abstract: A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.

公开(公告)号：EP1428400A1

公开(公告)日：2004-06-16

申请号：EP02759727.7

申请日：2002-09-18

Applicant: QUALCOMM Incorporated

Inventor： CHEN, Jiangxin ,  NEUFELD, Arthur ,  GLAZKO, Serguei ,  AMERGA, Messay

IPC: H04Q7/38

CPC classification number: H04W68/025 ,  H04W24/00 ,  H04W52/0216 ,  H04W52/0245 ,  H04W68/00 ,  H04W72/08 ,  Y02D70/122

Abstract: A quick paging channel (QPCH) is used to receive paging indicators that indicate that a wireless communication device (WCD) has a message on a paging channel relating to, for example, an incoming call to the WCD. When the condition of the quick paging channel is too low to receive paging indicators reliably, the quick paging channel is disabled to avoid false alarms, and the slotted paging channel is used to receive paging messages without monitoring the QPCH. When the QPCH signal is strong, the probability of false alarms is lower, and the quick paging channel is enabled. By using the quick paging channel to receive paging indicators only when the QPCH signal is strong, the wireless communication device can remain in a sleep state for greater periods of time as compared with the use of a slotted paging channel. As a result, standby time may be significantly improved.