Patents by Inventor Karthik Nagarajan

Karthik Nagarajan 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).

  • Patent number: 12185254
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a mobile station may receive information relating to a power amplifier backoff adjustment. The mobile station may transmit an uplink communication on a frequency channel using an adjusted power amplifier backoff determined based at least in part on the information. Numerous other aspects are described.
    Type: Grant
    Filed: April 16, 2021
    Date of Patent: December 31, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Morteza Soltani, Jun Ma, Anantha Krishna Karthik Nagarajan, Iyab Issam Sakhnini, Wooseok Nam, Xiaoxia Zhang
  • Patent number: 12114312
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may process, for a physical uplink control channel (PUCCH) communication in a millimeter wave (mmWave) band, information for transmission, wherein the information is modulated using an extended sequence with a length greater than a base sequence length for PUCCH communication or wherein a cyclic shift, of a plurality of cyclic shifts for a set of contiguous resource blocks for transmission of the information, is applied to the information based at least in part on a resource block group associated with the information. The UE may transmit the information based at least in part on processing the information. Numerous other aspects are described.
    Type: Grant
    Filed: January 25, 2021
    Date of Patent: October 8, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Anantha Krishna Karthik Nagarajan, Jing Sun, Jun Ma, Xiaoxia Zhang, Zhifei Fan, Wooseok Nam, Qiang Wu, Tao Luo, Peter Gaal, Juan Montojo, Ahmed Abdelaziz Ibrahim Abdelaziz Zewail, Mehmet Izzet Gurelli, Iyab Issam Sakhnini, Sony Akkarakaran
  • Patent number: 12075384
    Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, a first tracking reference signal configuration and a second tracking reference signal configuration. The first tracking reference signal configuration may include a first set of parameters and the second tracking reference signal configuration may include a second set of parameters. The UE, the base station, or both may identify an indicator for selection from among the first tracking reference signal configuration and the second tracking reference signal configuration. The UE may receive, from the base station and based on the identified indicator for selection, a tracking reference signal in accordance with the first tracking reference signal configuration or the second tracking reference signal configuration.
    Type: Grant
    Filed: July 14, 2021
    Date of Patent: August 27, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Jun Ma, Xiaoxia Zhang, Qiang Wu, Tao Luo, Iyab Issam Sakhnini, Mehmet Izzet Gurelli, Ahmed Abdelaziz Ibrahim Abdelaziz Zewail, Jing Sun, Wooseok Nam, Anantha Krishna Karthik Nagarajan, Peter Gaal, Zhifei Fan, Juan Montojo, Sony Akkarakaran, Arumugam Chendamarai Kannan
  • Patent number: 12010056
    Abstract: Certain aspects of the present disclosure provide techniques for demodulation reference signal (DMRS) sequence selection. One aspect provides a method for wireless communication by a first wireless node. The method generally includes selecting a type of DMRS sequence to be used for communication with a second wireless node based on a signal quality associated with the communication, receiving a message having the type of DMRS sequence, and performing channel estimation based on the DMRS sequence using the message.
    Type: Grant
    Filed: November 5, 2021
    Date of Patent: June 11, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Anantha Krishna Karthik Nagarajan, Jun Ma, Morteza Soltani, Xiaoxia Zhang, Iyab Issam Sakhnini, Wooseok Nam, Tao Luo, Peter Gaal, Juan Montojo
  • Patent number: 12010637
    Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify a configuration of a set of synchronization signal blocks (SSBs) to be transmitted by a first base station or a second base station. In some cases, the UE may be served by the first base station and the UE may receive, from the first base station or the second base station, a message indicating that a transmission of at least one SSB of the set of SSBs is canceled and indicating resources for a signal (e.g., a reference signal, alternative SSB transmission) to be transmitted by the first base station or the second base station as an alternative to the canceled at least one SSB. The UE may receive, based on the received message from the first base station or the second base station, the signal using the indicated resources.
    Type: Grant
    Filed: June 14, 2021
    Date of Patent: June 11, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Anantha Krishna Karthik Nagarajan, Jun Ma, Tao Luo, Peter Gaal, Qiang Wu, Xiaoxia Zhang, Jing Sun, Mehmet Izzet Gurelli, Iyab Issam Sakhnini, Ahmed Abdelaziz Ibrahim Abdelaziz Zewail, Juan Montojo, Sungwoo Park
  • Patent number: 11979884
    Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE). The apparatus may receive, from a base station via a DCI message, an indication of at least one K1 value corresponding to a plurality of physical downlink shared channel (PDSCH) transmissions over a plurality of PDSCH resources. The DCI message may comprise scheduling information for the plurality of PDSCH transmissions. The at least one K1 value may be associated with at least one physical uplink control channel (PUCCH) resource and indicative of a PDSCH-to-hybrid automatic repeat request (HARQ) timing. The apparatus may transmit, to the base station via the at least one PUCCH resource, at least one acknowledgment/negative-acknowledgment (ACK/NACK) indication associated with the at least one K1 value and corresponding to the plurality of PDSCH resources.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: May 7, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Qingjiang Tian, Jing Sun, Xiaoxia Zhang, Zhifei Fan, Tao Luo, Wooseok Nam, Ahmed Abdelaziz Ibrahim Abdelaziz Zewail, Anantha Krishna Karthik Nagarajan, Jun Ma
  • Patent number: 11924887
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive, from a base station, an indication of a time gap value associated with a random access channel (RACH) procedure, wherein the time gap value is based at least in part on a capability of the base station, determine whether a physical RACH (PRACH) occasion associated with the RACH procedure is valid based at least in part on receiving the indication of the time gap value associated with the RACH procedure, and selectively transmit, to the base station, a PRACH transmission in the PRACH occasion based at least in part on determining whether the PRACH occasion is valid. Numerous other aspects are provided.
    Type: Grant
    Filed: June 30, 2021
    Date of Patent: March 5, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Ahmed Abdelaziz Ibrahim Abdelaziz Zewail, Tao Luo, Xiaoxia Zhang, Qiang Wu, Jun Ma, Iyab Issam Sakhnini, Jing Sun, Mehmet Izzet Gurelli, Anantha Krishna Karthik Nagarajan, Juan Montojo, Peter Gaal
  • Publication number: 20240015751
    Abstract: Wireless communication techniques that include enhanced implicit PUCCH resource indication and identification techniques are discussed. A base station may transmit a PUCCH resource set that includes a plurality of PUCCH resources. A UE may receive a PUCCH resource set that includes a plurality of PUCCH resources. The base station may indicate a PUCCH resource of the plurality of PUCCH resources to use for uplink communication based on a PUCCH resource indicator and one or more additional parameters. A UE may identify a PUCCH resource of the plurality of PUCCH resources to use for uplink communication based, at least in part, on a PUCCH resource indicator and one or more additional parameters. Other aspects and features are also claimed and described.
    Type: Application
    Filed: September 20, 2021
    Publication date: January 11, 2024
    Inventors: Wooseok Nam, Tao Luo, Sony Akkarakaran, Xiaoxia Zhang, Jing Sun, Juan Montojo, Jun Ma, Anantha Krishna Karthik Nagarajan
  • Patent number: 11864238
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive, from a base station, a random access configuration indicating synchronization signal block (SSB)-to-random access channel (RACH) occasion mapping information, wherein the SSB-to-RACH occasion mapping information is associated with a first set of RACH occasions and a second set of RACH occasions, select a RACH occasion based at least in part on the SSB-to-RACH occasion mapping information, and transmit, to the base station, a physical RACH communication using the RACH occasion based at least in part on selecting the RACH occasion. Numerous other aspects are provided.
    Type: Grant
    Filed: June 30, 2021
    Date of Patent: January 2, 2024
    Assignee: QUALCOMM Incorporated
    Inventors: Ahmed Abdelaziz Ibrahim Abdelaziz Zewail, Xiaoxia Zhang, Tao Luo, Qiang Wu, Jun Ma, Iyab Issam Sakhnini, Mehmet Izzet Gurelli, Anantha Krishna Karthik Nagarajan, Jing Sun, Juan Montojo, Peter Gaal
  • Patent number: 11812391
    Abstract: A method of controlling power in a transmission system may include determining a first transmit power of a first transmit path, determining a second transmit power of a second transmit path, and controlling the first transmit path and the second transmit path based on a combination of the first transmit power and the second transmit power. The combination of the first transmit power and the second transmit power may include a sum of the first transmit power and the second transmit power. Controlling the first transmit path and the second transmit path may include determining a first effective power target for the first transmit path based on the first transmit power and the second transmit power, and determining a second effective power target for the second transmit path based on the first transmit power and the second transmit power.
    Type: Grant
    Filed: November 7, 2022
    Date of Patent: November 7, 2023
    Inventors: Pranav Dayal, Kee-Bong Song, Hou-Shin Chen, Sung-En Chiu, Karthik Nagarajan
  • Patent number: 11653347
    Abstract: Apparatus, methods, and computer-readable media for coexistence of multiple uplink control channel formats for wireless communication with power spectral density limitation are disclosed herein. A user equipment (UE) may communicate, with a base station (BS) over a random access channel on a first set of random access resources or a second set of random access resources, a random access request based on a comparison between an intended transmit power of the random access request and a reference transmit power threshold. The UE may communicate, on a first set of uplink resources, a control message for initial network access when the random access request is communicated on the first set of random access resources. The UE also may communicate, on a second set of uplink resources, the control message when the random access request is communicated on the second set of random access resources.
    Type: Grant
    Filed: December 14, 2020
    Date of Patent: May 16, 2023
    Assignee: QUALCOMM Incorporated
    Inventors: Anantha Krishna Karthik Nagarajan, Jing Sun, Xiaoxia Zhang, Tao Luo, Jun Ma, Wooseok Nam, Zhifei Fan, Qingjiang Tian, Hemant Saggar, Ahmed Abdelaziz Ibrahim Abdelaziz Zewail
  • Patent number: 11638278
    Abstract: Methods, systems, and devices for wireless communications are described. Some systems may support wireless communications in high frequency millimeter wave (mmW) bands, such as frequency range 4 (FR4) or other frequency ranges. To support such communications, a base station may dynamically configure a cyclic prefix (CP) length for single carrier waveform communications. The base station may determine the CP length to handle a beam switching delay, a delay spread of a physical propagation channel, or both. In some examples, a user equipment (UE) may provide feedback to the base station, and the base station may configure the UE with a CP length based on the feedback. The base station may transmit a configuration message to a UE indicating the configured CP length. A single carrier waveform with the configured CP length may maintain a symbol-level alignment with other supported waveforms, such as orthogonal frequency division multiplexing (OFDM) waveforms.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: April 25, 2023
    Assignee: QUALCOMM Incorporated
    Inventors: Jun Ma, Xiaoxia Zhang, Iyab Issam Sakhnini, Anantha Krishna Karthik Nagarajan, Morteza Soltani
  • Patent number: 11626883
    Abstract: A digital-to-time converter (DTC) converts a digital code into a time delay using a capacitor digital-to-analog converter (CDAC) that functions as a charging capacitor. The DTC includes a switched capacitor voltage-to-current converter for the formation of a charging current (or a discharging current) for charging (or for discharging) the charging capacitor responsive to a triggering clock edge that begins the time delay. A comparator compares a voltage on the charging capacitor to a threshold voltage to determine an end of the time delay.
    Type: Grant
    Filed: September 28, 2021
    Date of Patent: April 11, 2023
    Assignee: QUALCOMM INCORPORATED
    Inventors: Zhengzheng Wu, Chao Song, Karthik Nagarajan
  • Publication number: 20230082170
    Abstract: A method of controlling power in a transmission system may include determining a first transmit power of a first transmit path, determining a second transmit power of a second transmit path, and controlling the first transmit path and the second transmit path based on a combination of the first transmit power and the second transmit power. The combination of the first transmit power and the second transmit power may include a sum of the first transmit power and the second transmit power. Controlling the first transmit path and the second transmit path may include determining a first effective power target for the first transmit path based on the first transmit power and the second transmit power, and determining a second effective power target for the second transmit path based on the first transmit power and the second transmit power.
    Type: Application
    Filed: November 7, 2022
    Publication date: March 16, 2023
    Inventors: Pranav DAYAL, Kee-Bong SONG, Hou-Shin CHEN, Sung-En CHIU, Karthik NAGARAJAN
  • Patent number: 11533058
    Abstract: A digital phase-frequency detector characterizes a delay between two input clock signals using a ring oscillator. A cycle count of a ring oscillator signal circulating through a loop in the ring oscillator during the delay provides a coarse measurement of the delay. A phase of the ring oscillator signal in the loop at the end of the delay provides a fine measurement of the delay. A digital phase-locked loop may control an oscillation frequency of a digitally-controlled oscillator responsive to the fine measurement of the delay and control a division within a clock divider responsive to the coarse measurement of the delay.
    Type: Grant
    Filed: December 17, 2020
    Date of Patent: December 20, 2022
    Assignee: QUALCOMM INCORPORATED
    Inventors: Zhengzheng Wu, Chao Song, Karthik Nagarajan
  • Patent number: 11496969
    Abstract: A method of controlling power in a transmission system may include determining a first transmit power of a first transmit path, determining a second transmit power of a second transmit path, and controlling the first transmit path and the second transmit path based on a combination of the first transmit power and the second transmit power. The combination of the first transmit power and the second transmit power may include a sum of the first transmit power and the second transmit power. Controlling the first transmit path and the second transmit path may include determining a first effective power target for the first transmit path based on the first transmit power and the second transmit power, and determining a second effective power target for the second transmit path based on the first transmit power and the second transmit power.
    Type: Grant
    Filed: April 5, 2021
    Date of Patent: November 8, 2022
    Inventors: Pranav Dayal, Kee-Bong Song, Hou-Shin Chen, Sung-En Chiu, Karthik Nagarajan
  • Publication number: 20220338126
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a mobile station may receive information relating to a power amplifier backoff adjustment. The mobile station may transmit an uplink communication on a frequency channel using an adjusted power amplifier backoff determined based at least in part on the information. Numerous other aspects are described.
    Type: Application
    Filed: April 16, 2021
    Publication date: October 20, 2022
    Inventors: Morteza SOLTANI, Jun MA, Anantha Krishna Karthik NAGARAJAN, Iyab Issam SAKHNINI, Wooseok NAM, Xiaoxia ZHANG
  • Publication number: 20220240243
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may process, for a physical uplink control channel (PUCCH) communication in a millimeter wave (mmWave) band, information for transmission, wherein the information is modulated using an extended sequence with a length greater than a base sequence length for PUCCH communication or wherein a cyclic shift, of a plurality of cyclic shifts for a set of contiguous resource blocks for transmission of the information, is applied to the information based at least in part on a resource block group associated with the information. The UE may transmit the information based at least in part on processing the information. Numerous other aspects are described.
    Type: Application
    Filed: January 25, 2021
    Publication date: July 28, 2022
    Inventors: Anantha Krishna Karthik NAGARAJAN, Jing SUN, Jun MA, Xiaoxia ZHANG, Zhifei FAN, Wooseok NAM, Qiang WU, Tao LUO, Peter GAAL, Juan MONTOJO, Ahmed Abdelaziz Ibrahim Abdelaziz ZEWAIL, Mehmet Izzet GURELLI, Iyab Issam SAKHNINI, Sony AKKARAKARAN
  • Publication number: 20220240277
    Abstract: Methods, systems, and devices for wireless communications are described. Some systems may support wireless communications in high frequency millimeter wave (mmW) bands, such as frequency range 4 (FR4) or other frequency ranges. To support such communications, a base station may dynamically configure a cyclic prefix (CP) length for single carrier waveform communications. The base station may determine the CP length to handle a beam switching delay, a delay spread of a physical propagation channel, or both. In some examples, a user equipment (UE) may provide feedback to the base station, and the base station may configure the UE with a CP length based on the feedback. The base station may transmit a configuration message to a UE indicating the configured CP length. A single carrier waveform with the configured CP length may maintain a symbol-level alignment with other supported waveforms, such as orthogonal frequency division multiplexing (OFDM) waveforms.
    Type: Application
    Filed: January 28, 2021
    Publication date: July 28, 2022
    Inventors: Jun Ma, Xiaoxia Zhang, Iyab Issam Sakhnini, Anantha Krishna Karthik Nagarajan, Morteza Soltani
  • Publication number: 20220239427
    Abstract: Certain aspects of the present disclosure provide techniques for demodulation reference signal (DMRS) sequence selection. One aspect provides a method for wireless communication by a first wireless node. The method generally includes selecting a type of DMRS sequence to be used for communication with a second wireless node based on a signal quality associated with the communication, receiving a message having the type of DMRS sequence, and performing channel estimation based on the DMRS sequence using the message.
    Type: Application
    Filed: November 5, 2021
    Publication date: July 28, 2022
    Inventors: Anantha Krishna Karthik NAGARAJAN, Jun MA, Morteza SOLTANI, Xiaoxia ZHANG, Iyab Issam SAKHNINI, Wooseok NAM, Tao LUO, Peter GAAL, Juan MONTOJO