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: 20130231110
    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: April 16, 2013
    Publication date: September 5, 2013
    Inventors: Murali Narasimha, Sandeep H. Krishnamurthy, Ravi Kuchibhotla
  • Patent number: 8520617
    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: Grant
    Filed: November 2, 2010
    Date of Patent: August 27, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H. Krishnamurthy, Michael E. Buckley, Murali Narasimha
  • Patent number: 8509102
    Abstract: A method in a wireless communication terminal including receiving a signal comprising at least a Positioning Reference Signal (PRS) transmission from a serving cell and a PRS transmission from a neighbor cell, estimating a signal quality metric (SQM) based on the PRS transmission from the neighbor cell, estimating a time difference of arrival (TDOA) measurement for the neighbor cell based on the PRS transmissions, determining if the estimated SQM satisfies a criterion, and sending a report to the serving cell that includes at least the estimated TDOA if the criterion is satisfied.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: August 13, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H. Krishnamurthy, Colin D. Frank
  • Publication number: 20130202015
    Abstract: A wireless communication device and a method therein includes estimating a channel for each of a plurality of transmit antenna ports using a reference symbol received from the corresponding antenna port, determining a composite channel estimate based on the estimated channels and based on a precoding matrix, and determining an updated composite channel estimate using the composite channel estimate and using a gain correction corresponding to the precoding matrix. The gain correction can be obtained over-the-air or computed at the wireless communication device.
    Type: Application
    Filed: February 7, 2012
    Publication date: August 8, 2013
    Applicant: Motorola Mobility, Inc.
    Inventors: Colin D Frank, Tyler A. Brown, Sandeep H. Krishnamurthy
  • Patent number: 8503322
    Abstract: A method in a wireless communication terminal includes receiving an aggregated carrier including a first component carrier and a second component carrier, measuring leakage of a reference signal from the first component carrier onto the second component carrier, receiving a signal on the aggregated carrier, and compensating for leakage of the signal from the first component carrier to the second component carrier based on the measurement of the leakage of the reference signal.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: August 6, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H. Krishnamurthy, Colin D. Frank
  • Patent number: 8504039
    Abstract: A mobile station and a method therein 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: Grant
    Filed: October 26, 2009
    Date of Patent: August 6, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Murali Narasimha, Sandeep H Krishnamurthy, Ravi Kuchibhotla
  • Patent number: 8483707
    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: Grant
    Filed: June 26, 2009
    Date of Patent: July 9, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H Krishnamurthy, Colin D Frank, Kenneth A Stewart
  • Patent number: 8457112
    Abstract: A wireless communication terminal includes 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: Grant
    Filed: October 26, 2009
    Date of Patent: June 4, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H. Krishnamurthy, Ravi Kuchibhotla
  • Patent number: 8442513
    Abstract: A method in a mobile station for measurement reporting in a wireless system includes detecting the 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: Grant
    Filed: October 26, 2009
    Date of Patent: May 14, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H Krishnamurthy, Ravi Kuchibhotla, Murali Narasimha
  • Patent number: 8433249
    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: Grant
    Filed: October 21, 2010
    Date of Patent: April 30, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H. Krishnamurthy, Robert T. Love
  • Patent number: 8396047
    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: Grant
    Filed: March 3, 2011
    Date of Patent: March 12, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Sandeep H. Krishnamurthy, Robert T. Love, Ajit Nimbalker, Kenneth A. Stewart, Xiangyang Zhuang
  • Publication number: 20130044621
    Abstract: A wireless communication terminal that has the self-interference due to the support of carrier aggregation, aggregating and jointly using two or more component carriers for transmission and reception, performs a first set of measurements on a received signal on a first operating frequency, wherein the first set of measurements are performed during which the wireless terminal transmits or receives signals on a second operating frequency. In an alternative embodiment, the wireless communication terminal changes the maximum transmit power limit on a first operating frequency on a per-slot basis to reduce the impact of harmonic or intermodulation distortion on a received signal at a second operating frequency.
    Type: Application
    Filed: August 16, 2012
    Publication date: February 21, 2013
    Applicant: MOTOROLA MOBILITY LLC
    Inventors: Hyejung Jung, Colin D. Frank, Sandeep H. Krishnamurthy, Vijay Nangia
  • Publication number: 20130044664
    Abstract: A communication system is provided wherein a user equipment (UE) receives control information from a wireless network. The UE monitors control channel candidates using common reference signals (CRS) and monitors enhanced control channel candidates using demodulation reference signals (DMRS) when the UE is configured in a first transmission mode, such as transmission mode 9, for receiving a downlink shared traffic channel based on DMRS. The UE monitors control channel candidates only using CRS when the UE is configured in a second transmission mode, such as any of transmission modes 1-6, for receiving a downlink shared traffic channel based on CRS. The UE then receives downlink control information (DCI) in a subframe in one of the monitored control channel candidates or enhanced control channel candidates in the subframe.
    Type: Application
    Filed: August 8, 2012
    Publication date: February 21, 2013
    Applicant: MOTOROLA MOBILITY LLC
    Inventors: Ravikiran Nory, Sandeep H. Krishnamurthy, Robert T. Love, Vijay Nangia, Ajit Nimbalker, Krishna Kamal Sayana, Xiangyang Zhuang
  • Publication number: 20130044831
    Abstract: A method and apparatus for power allocation for overlapping transmissions is provided herein. During operation, user equipment will determine if transmissions to a single base station, on various frequencies, will be overlapping. If so, a determination is made to back off the power for at least one transmission on one frequency.
    Type: Application
    Filed: August 15, 2011
    Publication date: February 21, 2013
    Applicant: MOTOROLA MOBILITY, INC.
    Inventors: Murali Narasimha, Vijay Nangia, Ravikiran Nory, Sandeep H. Krishnamurthy
  • Publication number: 20130044727
    Abstract: A user equipment (UE) receives a signal comprising multiple resource blocks and configured for receiving a subframe comprising multiple time-frequency resources, the time-frequency resources comprising at least two control channel candidates. The UE determines a first control channel candidate of the at least two control channel candidates in the subframe, determines a first antenna port (AP) associated with the first control channel candidate, decodes the first control channel candidate based on the first AP, determines a second control channel candidate of the at least two control channel candidates in the subframe, determines a second AP associated with the second control channel candidate, and decodes the second control channel candidate based on the second AP, wherein the AP used for decoding the first control channel candidate is distinct from the AP used for decoding the second control channel candidate.
    Type: Application
    Filed: August 8, 2012
    Publication date: February 21, 2013
    Applicant: Motorola Mobility LLC
    Inventors: Ravikiran Nory, Sandeep H. Krishnamurthy, Robert T. Love, Vijay Nangia, Ajit Nimbalker, Krishna Kamal Sayana, Xiangyang Zhuang
  • Publication number: 20120327866
    Abstract: A method in a wireless communication device comprises determining transmission powers for at least two clusters, wherein each cluster includes at least one physical resource block (RB), determining a difference in a characteristic of the transmission powers determined for the at least two clusters, and varying a transmit power allocated to at least one cluster if the difference in the characteristic exceeds a power spread threshold, wherein the power allocated to each cluster is a function of pathloss between the wireless communication device and a serving base station.
    Type: Application
    Filed: June 24, 2011
    Publication date: December 27, 2012
    Applicant: MOTOROLA MOBILITY, INC.
    Inventors: Sandeep H. Krishnamurthy, Colin D. Frank, Vijay Nangia
  • Publication number: 20120327984
    Abstract: A method, telecommunication apparatus, and electronic device detect a status of a radio link. A transceiver 302 may receive a reference signal transmitted from a base station 104. A processor 304 may assume a transmission of a codeword of a first payload type from the base station and may determine a synchronization status based on the received reference signal and based on the assumed transmission of the codeword of the first payload type from the base station.
    Type: Application
    Filed: September 6, 2012
    Publication date: December 27, 2012
    Applicant: MOTOROLA MOBILITY LLC
    Inventors: Sandeep H. Krishnamurthy, Michael E. Buckley, Ravi Kuchibhotla, Robert Love, Ravi Nory
  • Publication number: 20120281593
    Abstract: A broadband cellular network (BCN) provides a user equipment (UE) access to TVWS resources. The BCN authorizes the UE to access TVWS resources by conveying a mobile device identifier received from the UE, and a cell identifier associated with the UE's coverage area, to a Federal Communications Commission (FCC)-certified Database and receiving, from the Database, and storing an FCC ID associated with the UE and a set of available TVWS resources. The BCN then conveys, to the UE via a broadband cellular technology, a channel resource information element (CRIE) that includes the cell identifier and identifies the set of available TVWS resources. Subsequently, the BCN re-authorizes the UE to access TVWS resources based on the stored FCC ID and without re-conveying the mobile device identifier to the Database. The BCN further utilizes broadband cellular technology procedures to provide a “virtual” contact verification signal (VCVS) to the UE.
    Type: Application
    Filed: May 4, 2011
    Publication date: November 8, 2012
    Applicant: MOTOROLA MOBILITY, INC.
    Inventors: Kenneth A. Stewart, Colin D. Frank, Sandeep H. Krishnamurthy, Ravi Kuchibhotla, Robert T. Love, Ajit Nimbalker, Ravikiran Nory
  • Publication number: 20120281594
    Abstract: A broadband cellular network (BCN) provides a user equipment (UE) access to TVWS resources. The BCN authorizes the UE to access TVWS resources by conveying a mobile device identifier received from the UE, and a cell identifier associated with the UE's coverage area, to a Federal Communications Commission (FCC)-certified Database and receiving, from the Database, and storing an FCC ID associated with the UE and a set of available TVWS resources. The BCN then conveys, to the UE via a broadband cellular technology, a channel resource information element (CRIE) that includes the cell identifier and identifies the set of available TVWS resources. Subsequently, the BCN re-authorizes the UE to access TVWS resources based on the stored FCC ID and without re-conveying the mobile device identifier to the Database. The BCN further utilizes broadband cellular technology procedures to provide a “virtual” contact verification signal (VCVS) to the UE.
    Type: Application
    Filed: May 4, 2011
    Publication date: November 8, 2012
    Applicant: MOTOROLA MOBILITY, INC.
    Inventors: Kenneth A. Stewart, Colin D. Frank, Sandeep H. Krishnamurthy, Ravi Kuchibhotla, Robert T. Love, Ajit Nimbalker, Ravikiran Nory
  • Publication number: 20120257519
    Abstract: A method and apparatus for a co-scheduler can mitigate UE-to-UE adjacent carrier frequency band interference by allocating three sets to a first user equipment uplink. Each set has at least one sub-carrier in a first frequency band, at least one uplink time period, and at least one transmission power parameter. The co-scheduler initially allocates the first set. The co-scheduler allocates the second set in response to detecting a second user equipment operating proximal to the first user equipment, and the second set differs from the first set in either at least one sub-carrier or at least one transmission power parameter. The co-scheduler allocates the third set in response to detecting that the second user equipment is no longer operating proximal to the first user equipment, and the third set differs from the second set in either at least one sub-carrier or at least one transmission power parameter.
    Type: Application
    Filed: April 8, 2011
    Publication date: October 11, 2012
    Applicant: Motorola Mobility, Inc.
    Inventors: Colin D. Frank, Sandeep H. Krishnamurthy, Robert T. Love, Ajit Nimbalker, Ravikiran Nory, Kenneth A. Stewart