Patents by Inventor Sandeep H. Krishnamurthy

Sandeep H. Krishnamurthy 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: 20110149868
    Abstract: A wireless communication device receives at least a section of a subframe from a base station in a wireless communication system. The subframe includes transmission resources multiplexed onto subcarriers of orthogonal frequency division multiplexed (OFDM) symbols. A first set of OFDM symbols includes a reference signal and at least a second set of OFDM symbols includes information other than the reference signal (e.g., channel-coded data). The wireless device determines which OFDM symbols of the subframe constitute the first set of OFDM symbols based on an identifier associated with a base station that transmitted the subframe. The wireless device may then process the reference signal from the OFDM symbols that are determined to be the first set of OFDM symbols. The wireless device may also determine which OFDM symbols of the subframe constitute the second set of OFDM symbols and process non-reference signal information from OFDM symbols of the second set.
    Type: Application
    Filed: March 3, 2011
    Publication date: June 23, 2011
    Inventors: Sandeep H. Krishnamurthy, Robert T. Love, Ajit Nimbalker, Kenneth A. Stewart, Xiangyang Zhuang
  • Publication number: 20110111779
    Abstract: A wireless communication infrastructure entity in a wireless communication system implementing an uplink control channel using a narrowband frequency resource within a wideband frequency resource. The entity includes a controller communicably coupled to the transceiver wherein the controller is configured to cause the transceiver to signal a location for an uplink control channel within the wideband frequency resource. The uplink control channel includes at least a pair of uplink control channels separated within the wideband frequency resource and accommodates simultaneous uplink transmissions by multiple user equipment communicating in the wireless communication system.
    Type: Application
    Filed: October 21, 2010
    Publication date: May 12, 2011
    Applicant: Motorola-Mobility, Inc.
    Inventors: Sandeep H. Krishnamurthy, Robert T. Love
  • Publication number: 20110110251
    Abstract: A method in a wireless terminal transceiver includes receiving a sequence of frames from a first base station, wherein each frame in the sequence contains a first set of time-frequency resources which may be used for scheduling data and a second set of time-frequency resources not used for scheduling data. The transceiver also receives a message from the first base station identifying a third set of time-frequency resources that is a subset of the first set of time-frequency resources, and estimates the channel state based on the transmission received in the third set of time-frequency resources.
    Type: Application
    Filed: November 2, 2010
    Publication date: May 12, 2011
    Applicant: MOTOROLA-MOBILITY, INC.
    Inventors: Sandeep H. Krishnamurthy, Michael E. Buckley, Murali Narasimha
  • Patent number: 7940740
    Abstract: A base station communicates a positioning reference signal (PRS) to wireless communication devices over a downlink in a wireless communication system by encoding a PRS into a first set of transmission resources, encoding other information into a second set of transmission resources, multiplexing the two sets of resources into a subframe such that the first set of resources is multiplexed into at least a portion of a first set of orthogonal frequency division multiplexed (OFDM) symbols based on an identifier associated with the base station and the second set of resources is multiplexed into a second set of OFDM symbols, and transmitting the subframe. Upon receiving the subframe, a wireless device determines which set of transmission resources contains the PRS based on the identifier associated with the base station that transmitted the subframe and processes the set of resources containing the PRS to estimate timing (e.g., time of arrival) information.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: May 10, 2011
    Assignee: Motorola Mobility, Inc.
    Inventors: Sandeep H. Krishnamurthy, Robert T. Love, Ajit Nimbalker, Kenneth A. Stewart, Xiangyang Zhuang
  • Publication number: 20110105135
    Abstract: A method in a wireless communication device and a wireless base station related to spectral efficiency optimization via interference control and mitigation in heterogeneous networks including macro-cells and home-base stations or femto-cells, wherein a mobile station provides a path for coordinating resource utilization between two base stations to facilitate interference coordination and/or mitigation.
    Type: Application
    Filed: November 1, 2010
    Publication date: May 5, 2011
    Applicant: MOTOROLA-MOBILITY, INC.
    Inventors: Sandeep H. Krishnamurthy, Colin D. Frank, Robert T. Love
  • Publication number: 20100331009
    Abstract: The present invention provides for wireless terminal and a method in a wireless terminal for use in a location determination approach using time of arrival estimates between the wireless terminal and a plurality of base stations in a cellular network. The method includes receiving assistance data from a serving base station for use in receiving a position reference signal used to determine a time of arrival of one or more respective position reference signals from the plurality of base stations relative to a time reference, wherein the assistance data includes a list of base stations, each base station included in the list to be one of used or excluded from use as part of the plurality of base stations for receiving the position reference signal and determining the time of arrival estimate for the received position reference signal.
    Type: Application
    Filed: June 26, 2009
    Publication date: December 30, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Sandeep H. Krishnamurthy, Colin D. Frank, Kenneth A. Stewart
  • Publication number: 20100323693
    Abstract: A wireless communication device including a transceiver coupled to a controller configured to cause the transceiver to receive a downlink transmission including a reference signal from a base station while camped on the base station in idle mode, to estimate a quality metric of a hypothetical paging channel reception based on the reference signal, and to determine perform reselection evaluation of a neighboring base stations based on the estimated quality metric.
    Type: Application
    Filed: June 22, 2009
    Publication date: December 23, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Sandeep H. Krishnamurthy, Ravi Kuchibhotla, Robert T. Love
  • Publication number: 20100317343
    Abstract: A wireless terminal receives signaling information, pertaining to a reference signal transmission in at least one specifically designated sub frame, the signaling information including a list, the list including base station identities. The terminal determines, from at least one of the base station identities in the list, the time-frequency resources associated with a reference signal transmission intended for observed time difference of arrival (OTDOA) measurements from a transmitting base station associated with said one base station identity. The time of arrival of a transmission from the transmitting base station, relative to reference timing, is measured. The wireless terminal can receive a command from a serving cell to start performing inter-frequency OTDOA measurement on a frequency layer containing reference signals, the frequency layer distinct from the serving frequency layer, the serving frequency layer not containing positioning reference signals.
    Type: Application
    Filed: June 10, 2010
    Publication date: December 16, 2010
    Applicant: Motorola, Inc.
    Inventors: Sandeep H. Krishnamurthy, Robert T. Love, Aljit Nimbalker, Kenneth A. Stewart, Xiangyang Zhuang
  • Publication number: 20100260154
    Abstract: A base station communicates a positioning reference signal (PRS) to wireless communication devices over a downlink in a wireless communication system by encoding a PRS into a first set of transmission resources, encoding other information into a second set of transmission resources, multiplexing the two sets of resources into a subframe such that the first set of resources is multiplexed into at least a portion of a first set of orthogonal frequency division multiplexed (OFDM) symbols based on an identifier associated with the base station and the second set of resources is multiplexed into a second set of OFDM symbols. Upon receiving the subframe, a wireless communication device determines which set of transmission resources contains the PRS based on the identifier associated with the base station that transmitted the subframe and processes the set of resources containing the PRS to estimate timing (e.g., time of arrival) information.
    Type: Application
    Filed: April 8, 2010
    Publication date: October 14, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Colin D. Frank, Sandeep H. Krishnamurthy, Kenneth A. Stewart, Xiangyang Zhuang, Robert T. Love
  • Publication number: 20100195566
    Abstract: A base station communicates a positioning reference signal (PRS) to wireless communication devices over a downlink in a wireless communication system by encoding a PRS into a first set of transmission resources, encoding other information into a second set of transmission resources, multiplexing the two sets of resources into a subframe such that the first set of resources is multiplexed into at least a portion of a first set of orthogonal frequency division multiplexed (OFDM) symbols based on an identifier associated with the base station and the second set of resources is multiplexed into a second set of OFDM symbols, and transmitting the subframe. Upon receiving the subframe, a wireless device determines which set of transmission resources contains the PRS based on the identifier associated with the base station that transmitted the subframe and processes the set of resources containing the PRS to estimate timing (e.g., time of arrival) information.
    Type: Application
    Filed: February 3, 2009
    Publication date: August 5, 2010
    Inventors: Sandeep H. Krishnamurthy, Robert T. Love, Ajit Nimbalker, Kenneth A. Stewart, Xiangyang Zhuang
  • Publication number: 20100122121
    Abstract: A method for predicting performance of a radio link in a wireless communication terminal including hypothesizing a second codeword including information associated with a hypothesized first codeword, obtaining channel state information from a received signal, and estimating a decoder error rate of the first codeword under a condition that the second codeword may not be decoded correctly, wherein the decoder error rate is estimated using the channel state information.
    Type: Application
    Filed: October 26, 2009
    Publication date: May 13, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Sandeep H. Krishnamurthy, Ravi Kuchibhotla
  • Publication number: 20100118856
    Abstract: A wireless communication terminal including a controller coupled to a transceiver wherein the controller is configured to determine a synchronization based on a mapping of channel state information to decoder error rate corresponding to a hypothetical control code word, to attempt to decode a control codeword in a received signal, and to conclude that an out of synchronization event has not occurred if the control codeword is decoded successfully regardless of an indication of the mapping.
    Type: Application
    Filed: October 26, 2009
    Publication date: May 13, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Sandeep H. Krishnamurthy, Ravi Kuchibhotla
  • Publication number: 20100113026
    Abstract: A method in a mobile station for avoiding interference to restricted access cells, including detecting presence of a restricted access cell, determining that a measured path-loss is larger than a path-loss threshold, determining that the mobile station is not allowed to access the restricted access cell, and barring a carrier frequency on which the restricted access cell is deployed when the measured path-loss is larger than the path-loss threshold and when the mobile station is not allowed access to the restricted access cell.
    Type: Application
    Filed: October 26, 2009
    Publication date: May 6, 2010
    Applicant: Motorola, Inc.
    Inventors: Murali Narasimha, Sandeep H. Krishnamurthy, Ravi Kuchibhotla
  • Publication number: 20100112958
    Abstract: A method in a mobile station for measurement reporting in a wireless system including detecting presence of a cell, applying a first filter to a first number of measurement samples of a first measurement quantity of the cell wherein the first number of measurement samples are determined from a switch point, and applying a second filter to a plurality of measurement samples obtained from measurements made subsequent to the first number of measurement samples.
    Type: Application
    Filed: October 26, 2009
    Publication date: May 6, 2010
    Applicant: Motorola, Inc.
    Inventors: Sandeep H. Krishnamurthy, Ravi Kuchibhotla, Murali Narasimha
  • Publication number: 20090232158
    Abstract: A method (300) for radio link control padding is shown. In its simplest form, it can include the steps of: providing (310) N bytes of data from a base station; interleaving (320) the N bytes of data using a turbo-interleaver; pre-pending (330) K bytes of zero padding; and passing (340) the interleaved N bytes and the pre-pended K bytes to a convolutional encoder to provide an output comprising a parity sequence adapted for further processing and providing a radio link control block for an enhanced general packet radio service 2-B mobile device. The method (300) is particularly adapted for use with Chase and incremental redundancy combining, which can provide fast, reliable and efficient general packet radio service to a 2-B mobile device.
    Type: Application
    Filed: March 13, 2008
    Publication date: September 17, 2009
    Applicant: MOTOROLA INC.
    Inventors: COLIN D. FRANK, SANDEEP H. KRISHNAMURTHY