Patents by Inventor Vivek Chawla

Vivek Chawla has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190239168
    Abstract: Aspects of the present disclosure relate to wireless communications and, more particularly, to how to allocate transmission power for uplink transmissions on different component carriers.
    Type: Application
    Filed: October 5, 2017
    Publication date: August 1, 2019
    Inventors: Gaoshan LI, Congchong RU, Hongbo YAN, Wei-Jei SONG, Tom CHIN, Vivek CHAWLA
  • Publication number: 20160119860
    Abstract: A device for and a method of optimizing slotted cell search by a multi-subscriber identity module (multi-SIM) device is provided. The method includes performing a packet-based activity on a first SIM of the multi-SIM device for a first timeslot provided by a first timer, performing a cell-search activity on a second SIM of the multi-SIM device for a second timeslot provided by the second timer; and performing the packet-based activity for the first timeslot and the cell-search activity for the second timeslot by alternately switching between the first timer and the second timer.
    Type: Application
    Filed: October 28, 2015
    Publication date: April 28, 2016
    Inventor: Vivek CHAWLA
  • Patent number: 9125154
    Abstract: A method for power management for use in system selection by simultaneous receivers taking into account power use during an idle state. A power penalty is determined for each of a plurality of wireless technology systems available to a receiver when conducting page monitoring sequences. Combined power penalties are determined for various combinations of wireless technology systems. Wireless technology systems are selected in a preferred combination having a least combined power penalty for monitoring pages during an idle mode.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: September 1, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Vivek Chawla, Shuqing Xing
  • Publication number: 20140051476
    Abstract: A method for power management for use in system selection by simultaneous receivers taking into account power use during an idle state. A power penalty is determined for each of a plurality of wireless technology systems available to a receiver when conducting page monitoring sequences. Combined power penalties are determined for various combinations of wireless technology systems. Wireless technology systems are selected in a preferred combination having a least combined power penalty for monitoring pages during an idle mode.
    Type: Application
    Filed: August 14, 2012
    Publication date: February 20, 2014
    Inventors: Vivek CHAWLA, Shuqing XING
  • Patent number: 8369255
    Abstract: 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.
    Type: Grant
    Filed: October 25, 2007
    Date of Patent: February 5, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Bhupesh Manoharlal Umatt, Vineet Mittal, Vivek Chawla
  • Patent number: 8170084
    Abstract: 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.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: May 1, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Parvathanathan Subrahmanya, Thejaswi Bharadwaj Madapushi Sheshadri, Vivek Chawla
  • Patent number: 8145132
    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.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: March 27, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Messay Amerga, Vivek Chawla, Deepali Garg
  • Publication number: 20110306315
    Abstract: 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.
    Type: Application
    Filed: August 24, 2011
    Publication date: December 15, 2011
    Applicant: QUALCOMM Incorporated
    Inventors: Parvathanathan Subrahmanya, Thejaswi Bharadwaj Madapushi Sheshadri, Vivek Chawla
  • Patent number: 8027373
    Abstract: 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.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: September 27, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Parvathanathan Subrahmanya, Thejaswi Bharadwaj Madapushi Sheshadri, Vivek Chawla
  • Publication number: 20090131047
    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.
    Type: Application
    Filed: September 17, 2008
    Publication date: May 21, 2009
    Applicant: QUALCOMM INCORPORATED
    Inventors: Messay Amerga, Vivek Chawla, Deepali Garg
  • Publication number: 20080117959
    Abstract: Techniques for selectively filtering a received signal in order to reduce false alarms in the detection of a synchronization signal are described. In one design, frequency characteristics of a received signal may be estimated. Large spectral peaks in the estimated frequency characteristics may be detected. Filter coefficients for a pseudo-whitening filter may then be derived based on the detected large spectral peaks. To derive these filter coefficients, a filter gain for each of multiple frequency bins may be set to a predetermined value if a large spectral peak is not detected or a value inversely related to the large spectral peak if detected. The filter gains for all frequency bins may be transformed to time domain and further processed to obtain the filter coefficients. The received signal may be filtered based on the filter coefficients to attenuate the large spectral peaks. The filtered signal may be processed to detect for the synchronization signal.
    Type: Application
    Filed: November 8, 2007
    Publication date: May 22, 2008
    Applicant: QUALCOMM INCORPORATED
    Inventors: Parvanthanathan Subrahmanya, Vivek Chawla, Deepali Garg
  • Publication number: 20070060095
    Abstract: 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.
    Type: Application
    Filed: September 15, 2005
    Publication date: March 15, 2007
    Inventors: Parvathanathan Subrahmanya, Thejaswi Bharadwaj Madapushi Sheshadri, Vivek Chawla