Patents by Inventor Srinivas Katar

Srinivas Katar 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: 20210250117
    Abstract: The present disclosure provides techniques for rate adaptation under congestion and latency constraints. The approaches described herein focus on aspects of latency, reliability, and power consumption instead of the traditional aspect of throughput. In an example, a method for rate adaptation is disclosed. The method may include determining whether to transmit a new packet or a retry packet. The method may also include reducing a maximum rate for a rate search in response to determining to transmit the retry packet. The method may further include transmitting the retry packet based on the reduced maximum rate.
    Type: Application
    Filed: July 24, 2018
    Publication date: August 12, 2021
    Inventors: Sandip HOMCHAUDHURI, Pavankumar VEERASHETTY, Vincent Knowles JONES, IV, Srinivas KATAR, Jian TAO, Rahul JAMMULA
  • Patent number: 11019603
    Abstract: This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for communicating channel selection constraints in a network having multiple access points (APs). In one aspect, a root AP may assist with channel selection (assignment) for the multiple APs. A first AP can provide channel operating constraints to the root AP to indicate one or more operating constraints for a particular channel that may be used by the first AP. The operating constraints may be based, at least in part, on a hardware characteristic of the first AP. For example, an operating constraint may indicate a minimum channel separation or a maximum transmit power to consider when the particular channel is used concurrently with another channel. In another aspect, the first AP can communicate a channel selection error and error code when a particular channel cannot be used due to an operating constraint.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: May 25, 2021
    Assignee: QUALCOMM INCORPORATED
    Inventors: Ajay Kumar Pathak, Srinivas Katar, Xiaolong Huang, Kapil Rai
  • Publication number: 20210127307
    Abstract: This disclosure provides methods, devices and systems for controlling basic service set (BSS) configuration of an access point (AP) in a multi-AP network. The multi-AP network may include a first AP that manages a first basic service set (BSS) and a second AP that manages a second BSS. The first BSS and the second BSS may share one or more wireless channels or may have overlapping coverage areas. A multi-AP controller may determine a BSS configuration policy (such as a maximum transmission opportunity (TXOP) duration) for the second BSS based on a type of traffic in the first BSS. This disclosure includes techniques for sharing traffic characteristics, determining the BSS configuration policy, communicating the BSS configuration policy, and controlling the BSS configuration policies for multiple BSSs so that one of the BSSs can provide a quality of service (QoS) for one or more stations (STAs).
    Type: Application
    Filed: October 23, 2020
    Publication date: April 29, 2021
    Inventors: Xiaolong Huang, Srinivas Katar, Bharat Bhushan
  • Publication number: 20210068008
    Abstract: Certain aspects of the present disclosure provide techniques that may allow a device participating in a setup procedure to efficiently propose a range of values for a negotiated parameter. The techniques may reduce setup time, for example, allowing a responder to accept a value within the proposed range which may eliminate overhead associated with some of the back and forth message exchange of typical negotiations.
    Type: Application
    Filed: July 10, 2020
    Publication date: March 4, 2021
    Inventors: Alfred ASTERJADHI, George CHERIAN, Abhishek Pramod PATIL, Yongchun XIAO, Srinivas KATAR, Sandip HOMCHAUDHURI
  • Patent number: 10912088
    Abstract: Method, systems, and apparatuses are described for wireless communications. More particularly, a wireless station may connect to a wireless network using a first radio frequency (RF) band and detect a signal strength of the first RF band is greater than a roaming threshold. The wireless station may perform a plurality of scans for support by the wireless network of a second RF band in response to the detected signal strength. Each scan may occur when the signal strength of the first RF band is greater than the roaming threshold. The wireless station may selectively connect to the wireless network using the second RF band based at least in part on the scanning and a throughput supported by the wireless network over the second RF band. The first RF band may be a 2.4 GHz band and the second RF band may be a 5 GHz band.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: February 2, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Srinivas Katar, Amod Bodas, Ramaswamy Venkateshwaran, Farrukh Usmani, Ravi Gidvani, Hang Su
  • Publication number: 20200163118
    Abstract: This disclosure provides methods, devices and systems for selecting a first group of wireless communication devices to receive a first multi-user (MU) protocol data unit (PDU). A threshold value for identifying collisions of PDUs is determined based on the number of devices in the first group of devices. A second group of wireless communication devices is selected to receive a second MU PDU. Responsive to determining that an acknowledgment (ACK) acknowledging the second MU PDU has not been received from a device of the second group of devices within a threshold duration of time, a number of ACKs, including the ACK, that have not been received from the respective device is determined. An action is then performed based on the determined number of ACKs and the threshold value. In some implementations, the action includes reducing a data rate or initiating a backoff operation.
    Type: Application
    Filed: November 16, 2018
    Publication date: May 21, 2020
    Inventors: Xiaolong Huang, Lei Li, Srinivas Katar
  • Publication number: 20190306790
    Abstract: Various aspects of the disclosure provide for Target Wake Time (TWT) slot scheduling in a communication network. The various aspects includes determining a number of stations in the basic service set (BSS) of an access point (AP) exceeding a minimum number of stations, determining whether to establish TWT slot scheduling for at least one or more of the stations based on one or more operational condition of the communication network, and establishing a TWT slot scheduling of the one or more of the stations if the one or more operational condition of the communication network, individually or collectively, satisfy a threshold.
    Type: Application
    Filed: March 28, 2018
    Publication date: October 3, 2019
    Inventors: Sanoop Kottontavida, Xiaolong Huang, Yongchun Xiao, Naveen Gangadharan, Srinivas Katar, Sandip Homchaudhuri, James Simon Cho
  • Publication number: 20190281608
    Abstract: This disclosure provides systems, methods and apparatuses for channel selection and channel selection planning in a network including a root AP (RAP) and a number of satellite APs (SAPs). The root AP may assign operating channels for one or more of the satellite APs in a manner that optimizes network performance by considering the impact that each of the satellite APs (as well as their respective client devices) may have on the network. In some implementations, the root AP may provide centralized channel selection planning for the network based a number of network parameters observed by one or more of the satellite APs. The network parameters may include, for example, channel conditions, traffic loads, traffic patterns, service needs of client devices, available channels, and other network utilization information observed by one or more of the satellite APs.
    Type: Application
    Filed: March 9, 2018
    Publication date: September 12, 2019
    Inventors: Xiaolong Huang, Ahmed Ragab Elsherif, Srinivas Katar, Ajay Kumar Pathak, Manish Shukla, Bharat Bhushan, Ramaswamy Venkateshwaran
  • Patent number: 10397816
    Abstract: Methods, apparatus, and computer-readable media for wireless communication may involve techniques for throughput estimation. An expected air time parameter may be used as a parameter for estimating throughput. The expected air time parameter may be indicative of an estimated air time fraction obtainable for communications using an access point (AP), for example, between a wireless station (STA) and the AP. Either the expected air time parameter or an estimated air time fraction determined (e.g., calculated) from the expected air time parameter may be transmitted from the AP to the STA (or other communication device) to allow the STA (or other communication device) to determine an estimated throughput for communications using the AP.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: August 27, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Youhan Kim, Zhanfeng Jia, Srinivas Katar, Rahul Malik, Jay Kumar Sundararajan, Arnaud Meylan, Ning Zhang, George Cherian
  • Publication number: 20190253967
    Abstract: Various aspects provide a wireless station (STA) to implement congestion sensitive target wake time (TWT) communications scheduling and enable the STA to determine whether to engage in communications between TWT service periods. A method described includes identifying a congestion metric, determining whether the congestion metric meets a congestion threshold, and transmitting a request to establish TWT communications in response to determining that the congestion metric meets the congestion threshold. Another method described includes terminating a scheduled service period of a TWT communications, receiving an indication that a threshold number of frames is available for transmission to an STA from an access point (AP) or an indication that one or more frames are present in a transmission queue at the STA, and transmitting, by the STA to the AP an indication that a communications link is to remain active between the terminated scheduled service period and a subsequent scheduled service period.
    Type: Application
    Filed: February 14, 2018
    Publication date: August 15, 2019
    Inventors: Yongchun XIAO, Sandip HOMCHAUDHURI, Pradeep Kumar YENGANTI, Sanoop KOTTONTAVIDA, James Simon CHO, Srinivas KATAR, Shuibing DAI
  • Publication number: 20190253968
    Abstract: Various aspects provide a wireless station (STA) to implement congestion sensitive target wake time (TWT) communications scheduling and enable the STA to determine whether to engage in communications between TWT service periods. A method described includes identifying a congestion metric, determining whether the congestion metric meets a congestion threshold, and transmitting a request to establish TWT communications in response to determining that the congestion metric meets the congestion threshold. Another method described includes terminating a scheduled service period of a TWT communications, receiving an indication that a threshold number of frames is available for transmission to an STA from an access point (AP) or an indication that one or more frames are present in a transmission queue at the STA, and transmitting, by the STA to the AP an indication that a communications link is to remain active between the terminated scheduled service period and a subsequent scheduled service period.
    Type: Application
    Filed: February 14, 2018
    Publication date: August 15, 2019
    Inventors: Yongchun Xiao, Sandip Homchaudhuri, Pradeep Kumar Yenganti, Sanoop Kottontavida, James Cho, Srinivas Katar, Shuibing Dai
  • Publication number: 20190208041
    Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may determine a plurality of TCP ACKs, and at least one of TCP data or UDP data for a multi-user transmission to a set of STAs. The apparatus may allocate the plurality of TCP ACKs to a PPDU before allocating the at least one of the TCP data and the UDP data to the PPDU. In certain aspects, the plurality of TCP ACKs may be frequency division multiplexed in the PPDU. In certain other aspects, the apparatus may transmit, to the set of STAs, the multi-user transmission including at least the plurality of frequency division multiplexed TCP ACKs.
    Type: Application
    Filed: January 4, 2018
    Publication date: July 4, 2019
    Inventors: Madhan JAGANATHAN, Xiaolong HUANG, Srinivas KATAR, Nathaniel David HOUGHTON, Madhavan NAIR, Hao ZHU, Chao ZOU
  • Patent number: 10306672
    Abstract: A method includes sending, from a first transmitter to a first receiver, a request to send (RTS) message associated with a first transmit opportunity (TXOP). The RTS message requests the first receiver to indicate whether reuse of the first TXOP is permitted. The method further includes receiving, at the first transmitter from the first receiver, a clear to send (CTS) message responsive to the RTS message.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: May 28, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Hao Zhu, Srinivas Katar, Simone Merlin, Chao Zou, Gwendolyn Denise Barriac, George Cherian, Santosh Paul Abraham, Lawrence Winston Yonge, III, Hemanth Sampath
  • Publication number: 20190159220
    Abstract: Uplink multi-user multiple-in, multiple-out (UL MU-MIMO) transmissions involve coordinating or scheduling stations communications with an access point. Methods and systems for scheduling UL MU-MIMO transmissions provide selection of stations permitted to communicate during the UL MU-MIMO transmission. One such method includes transmitting a first trigger message that requests each station to transmit a second message to the access point. The method also includes receiving the second messages from responding stations and estimating, based on the second messages, one or more parameters for each responding station. The method further includes generating a schedule for the stations to transmit data to the access point and transmitting a second trigger message to the stations, the second trigger message identifying the schedule and the stations that are scheduled to transmit UL data to the access point according to the schedule.
    Type: Application
    Filed: November 17, 2017
    Publication date: May 23, 2019
    Inventors: Ahmed Ragab Elsherif, Srinivas Katar
  • Publication number: 20180367242
    Abstract: Certain aspects of the present disclosure relate to determining a signaling field modulation and coding scheme (MCS) value for communicating information in a signaling field of a frame to a plurality of user devices. Certain aspects of the present disclosure provide a method for wireless communications by an access point (AP). The method includes determining a signaling field modulation and coding scheme (MCS) value for communicating information in a signaling field of a frame to a plurality of user devices based on one or more data MCS values for communicating payload data of the frame to the plurality of user devices. The method further includes transmitting the frame to the plurality of user devices using the determined signaling field MCS value for the signaling field.
    Type: Application
    Filed: June 15, 2017
    Publication date: December 20, 2018
    Inventors: Ahmed Ragab ELSHERIF, Srinivas KATAR
  • Publication number: 20180359768
    Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may determine a set of STAs for at least one of a MU-MIMO transmission or an OFDMA transmission. In certain aspects, the set of STAs may be associated with a set of acceptable MCSs determined based on MCSs excluded from a union of a plurality of sets of unacceptable MCSs. In certain other aspects, each set of unacceptable MCSs in the plurality of sets of unacceptable MCSs may be associated with a different STA in the set of STAs. The apparatus may transmit the at least one of the MU-MIMO transmission or the OFDMA transmission to the set of STAs.
    Type: Application
    Filed: May 1, 2018
    Publication date: December 13, 2018
    Inventors: Xiaolong HUANG, Hao ZHU, Srinivas KATAR
  • Publication number: 20180337709
    Abstract: The present disclosure provides techniques for grouping in multi-user multiple-input-multiple-output (MU-MIMO) systems by using limited probing. With more wireless stations (STAs) being used in MU-MIMO groups, the probing used to obtain packet error metrics to determine the throughput for selecting the MU-MIMO groups for transmission can become more complex and involve a larger overhead. To reduce the probing overhead, various techniques are described in this disclosure. For example, an access point (AP) can identify a trigger to initiate a packet error probing. In response to the trigger, the AP embeds one or more probing packets that are part of the packet error probing within a short interframe space (SIFS)-burst data transmission process to take advantage of the existing structure of the process. Then, the AP can update at least one packet error metric (e.g., packet error rate or PER) based on feedback received in response to the probing packets.
    Type: Application
    Filed: May 19, 2017
    Publication date: November 22, 2018
    Inventors: Chao ZOU, Ahmed Ragab ELSHERIF, Hao ZHU, Srinivas KATAR
  • Publication number: 20180337713
    Abstract: The present disclosure provides techniques for rate adaptation in multi-user multiple-input-multiple-output (MU-MIMO) systems for wireless local area networks (WLANs). When rate adaptation is based solely on packet error rate (PER) from feedback provided by wireless stations (STAs), the rate selection may not be optimal. In some scenarios, rate adaptation from the combined use of PER and MU signal-to-interference-plus-noise ratio (MU-SINR) can allow for better selection of the rate components, such as modulation coding scheme (MCS) and number of spatial streams (Nss). Accordingly, the present disclosure provides techniques in which a condition associated with transmitting an MU PLCP Protocol Data Unit (MU-PPDU) for multiple STAs is identified, packet error (e.g., PER) and signal strength (e.g., MU-SINR) metrics are determined for each STA in response to such condition, a rate for each STA is determined based on the respective metrics, and the MU-PPDU is transmitted according to the determined rates.
    Type: Application
    Filed: May 19, 2017
    Publication date: November 22, 2018
    Inventors: Ahmed Ragab ELSHERIF, Srinivas KATAR
  • Publication number: 20180310279
    Abstract: This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for communicating channel selection constraints in a network having multiple access points (APs). In one aspect, a root AP may assist with channel selection (assignment) for the multiple APs. A first AP can provide channel operating constraints to the root AP to indicate one or more operating constraints for a particular channel that may be used by the first AP. The operating constraints may be based, at least in part, on a hardware characteristic of the first AP. For example, an operating constraint may indicate a minimum channel separation or a maximum transmit power to consider when the particular channel is used concurrently with another channel. In another aspect, the first AP can communicate a channel selection error and error code when a particular channel cannot be used due to an operating constraint.
    Type: Application
    Filed: April 23, 2018
    Publication date: October 25, 2018
    Inventors: Ajay Kumar Pathak, Srinivas Katar, Xiaolong Huang, Kapil Rai
  • Publication number: 20180302832
    Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer-readable media, for serving AP selection in a network having multiple access points (APs). In one aspect, a serving AP selection unit can steer a device (such as a client station, STA, or a child AP) based on a quality of service profile (such as a capacity requirement or a delay requirement) of the device. The device may be initially associated with a first AP (as the current serving AP) in the network. The serving AP selection unit may select a second AP as a new serving AP for the device, and cause the device to associate with the second AP rather than the first AP. The selection of a serving AP may take into account delay or hop count in addition to path capacities for various paths in the network.
    Type: Application
    Filed: April 12, 2018
    Publication date: October 18, 2018
    Inventors: Xiaolong Huang, Srinivas Katar, Sai Yiu Duncan Ho, Alireza Raissinia, Brian Michael Buesker, George Cherian, Ajay Kumar Pathak, Hao Zhu