Patents by Inventor Sridhar Rajagopal

Sridhar Rajagopal 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: 20210105125
    Abstract: A cloud radio access network (CRAN) system includes a baseband unit (BBU) and a radio unit (RU) remote from the BBU. The fronthaul interface between the RU and the BBU includes a radio frequency interface (RF) functionality implemented in the RU, and implementation of physical layer (PHY) functionality split between the BBU and the RU, including downlink (DL) resource element mapping and DL precoding implemented in the RU. Transmission of reference signals from the BBU to the RU is implemented separately from transmission of data from the BBU to the RU. The RU caches the transmitted reference signal based on at least one of subframe, symbol, xRAN resource block (XRB) and resource element (RE) associated with the reference signal. The fronthaul interface supports at least one of: (i) narrow band Internet of things (NB-IoT) physical random access channel (PRACH), and (ii) NB-IoT multi-tone format on physical uplink shared channel (PUSCH).
    Type: Application
    Filed: October 15, 2020
    Publication date: April 8, 2021
    Applicant: MAVENIR NETWORKS, INC
    Inventor: Sridhar RAJAGOPAL
  • Patent number: 10944668
    Abstract: There is provided a system that includes a local cloud radio access network (RAN), and a remote cloud RAN. The local cloud RAN processes latency-sensitive applications, and the remote cloud RAN processes latency-tolerant applications. User traffic is appropriately routed to the correct cloud RAN based on the application. User equipment (UE) has no knowledge of which network is being used for processing, i.e., this network processing split is done in a manner that is transparent to the UE, e.g., by dynamically selecting a different access point name for local vs. remote processing. The processing split of the RAN between the local cloud RAN and the remote cloud RAN is done in a dynamic manner depending on the number of devices requiring low latency support. This allows the local cloud RAN to be very compact and low-cost since it does not have to process the latency-tolerant traffic.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: March 9, 2021
    Assignee: Mavenir Networks, Inc.
    Inventors: Sridhar Rajagopal, Pardeep Kohli
  • Patent number: 10886976
    Abstract: A cloud radio access network (CRAN) system includes a baseband unit (BBU) and a radio unit (RU) remote from the BBU. The fronthaul interface between the RU and the BBU includes a radio frequency interface (RF) functionality implemented in the RU, and implementation of asymmetrical physical layer (PHY) functionality split between the BBU and RU. The asymmetrical physical layer (PHY) functionality split includes: downlink (DL) antenna port mapping and DL precoding implemented in the RU; and the split of the PHY functionality for uplink (UL) at the antenna port mapping in the BBU. For the DL, precoding and resource element (RE) mapping to frequency resources is implemented in BBU, and RE mapping for antenna ports is implemented in the RU|[WA1]. The split also provides support for license-assisted access (LAA) in the CRAN system.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: January 5, 2021
    Assignee: MAVENIR NETWORKS, INC.
    Inventors: Sridhar Rajagopal, Wessam Afifi Ahmed
  • Patent number: 10828687
    Abstract: A method of forming a strut includes providing a ring with a threaded section, coupling a mandrel to the ring, and electroforming a metallic layer over the mandrel and ring. The strut can include an integral monolithic body.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: November 10, 2020
    Assignee: GE Aviation Systems Limited
    Inventors: Sridhar Rajagopal, Sagar Paramashivaiah, Merin Sebastian, Sandeep Kumar, Dattu GuruVenkata Jonnalagadda
  • Publication number: 20200235788
    Abstract: A cloud radio access network (CRAN) system includes a baseband unit (BBU) and a radio unit (RU) remote from the BBU. The fronthaul interface between the RU and the BBU includes a radio frequency interface (RF) functionality implemented in the RU, and implementation of asymmetrical physical layer (PHY) functionality split between the BBU and RU. The asymmetrical physical layer (PHY) functionality split includes: downlink (DL) antenna port mapping and DL precoding implemented in the RU; and the split of the PHY functionality for uplink (UL) at the antenna port mapping in the BBU. For the DL, precoding and resource element (RE) mapping to frequency resources is implemented in BBU, and RE mapping for antenna ports is implemented in the RU|[WA1]. The split also provides support for license-assisted access (LAA) in the CRAN system.
    Type: Application
    Filed: July 23, 2018
    Publication date: July 23, 2020
    Applicant: MAVENIR NETWORKS, INC.
    Inventors: Sridhar RAJAGOPAL, Wessam Afifi AHMED
  • Publication number: 20200120466
    Abstract: A user equipment (UE) and base station (BS) in a wireless communication network. The UE includes a receiver configured to receive at least one semi-persistent scheduling (SPS) configuration among a plurality of SPS configurations from a BS. Each of the SPS configurations configures the UE with a different periodicity of a sidelink transmission to be transmitted to another UE. The UE also includes a transmitter configured to transmit the sidelink transmission in the different periodicity according to the at least one of the plurality of SPS configurations. The BS includes a controller configured to select at least one SPS configuration among a plurality of SPS configurations for a UE. Each of the SPS configurations configures the UE with a different periodicity of a sidelink transmission to be transmitted to another UE. The BS also includes a transmitter configured to transmit the selected at least one SPS configuration to the UE.
    Type: Application
    Filed: December 9, 2019
    Publication date: April 16, 2020
    Inventors: Sridhar Rajagopal, Aris Papasakellariou, Thomas David Novlan
  • Patent number: 10523345
    Abstract: Methods and Apparatuses for a transceiver calibration and antenna array operation in a multi-input multi-output (MIMO) system. One of the methods for operation of one or more of the apparatuses comprises sending a calibration signal and a pre-designed training sequence, via a coupling network, receiving a calibration signal and a pre-designed training sequence that is sent by the transceiver array in a time slotted pattern via a coupling network, generating an Rx calibration measurement (R1) based on one or more uplink signals received via antenna array and the coupling network, generating a Tx calibration measurement (T1) based on receipt of the calibration signal from each of antennas via the coupling network; and performing a joint Tx/Rx (TRx) calibration based on HR, R1, and T1, where H is a channel response in air interface, R is a channel response of receivers in transceiver array.
    Type: Grant
    Filed: February 7, 2018
    Date of Patent: December 31, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin Yuan, Yang Li, Gary Xu, Robert Monroe, Jianzhong Zhang, Sridhar Rajagopal
  • Patent number: 10506402
    Abstract: A user equipment (UE) and base station (BS) in a wireless communication network. The UE includes a receiver configured to receive at least one semi-persistent scheduling (SPS) configuration among a plurality of SPS configurations from a BS. Each of the SPS configurations configures the UE with a different periodicity of a sidelink transmission to be transmitted to another UE. The UE also includes a transmitter configured to transmit the sidelink transmission in the different periodicity according to the at least one of the plurality of SPS configurations. The BS includes a controller configured to select at least one SPS configuration among a plurality of SPS configurations for a UE. Each of the SPS configurations configures the UE with a different periodicity of a sidelink transmission to be transmitted to another UE. The BS also includes a transmitter configured to transmit the selected at least one SPS configuration to the UE.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: December 10, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Aris Papasakellariou, Thomas David Novlan
  • Patent number: 10440688
    Abstract: A relay node capable of supporting wireless backhaul communication includes a controller configured to identify a first timing of a backhaul downlink (DL) transmission and a second timing of an access uplink (UL) transmission to be substantially aligned, and a transceiver configured to receive at least one first symbol in the backhaul DL transmission from an base station (BS), and receive at least second symbol in an access UL transmission from a user equipment (UE). The controller is further configured to substantially align a third timing of a backhaul uplink (UL) transmission and a fourth timing of an access downlink (DL) transmission, wherein the transceiver is further configured to transmit at least third symbol in a backhaul uplink (UL) transmission to the BS, and transmit at least fourth symbol in the access DL transmission to the UE.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: October 8, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sudhir Ramakrishna, Boon Loong Ng, Li Guo, Thomas David Novlan, Young-Han Nam, Sridhar Rajagopal, Jianzhong Zhang
  • Publication number: 20190289497
    Abstract: There are provided systems, methods, and interfaces for optimization of the fronthaul interface bandwidth for Radio Access Networks and Cloud Radio Access Networks.
    Type: Application
    Filed: March 19, 2019
    Publication date: September 19, 2019
    Applicant: MAVENIR NETWORKS, INC.
    Inventor: Sridhar RAJAGOPAL
  • Patent number: 10411780
    Abstract: Methods and apparatuses for association in a beamformed wireless area network (WLAN) are provided. A method for operating a station (STA) includes randomly selecting a plurality of sector sweep frames for association beam transmission within a frame-aligned transmit sector sweep duration in an association beamforming training duration of a beacon interval, transmitting a beam in each of the randomly selected sector sweep frames, and receiving sector sweep feedback from an access point (AP). A method for operating the AP includes receiving at least one transmission from one or more STAs on at least one of randomly selected sector sweep frames within the frame-aligned transmit sector sweep duration, selecting a sector identifier for transmissions from each of the one or more STAs based on the at least one received transmission, and transmitting grouped sector sweep feedback indicating the selected sector identifier for transmissions from each of the one or more STAs.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: September 10, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Rakesh Taori
  • Publication number: 20190254047
    Abstract: There is provided a system, method, and interfaces for Radio Access Networks and Cloud Radio Access Networks.
    Type: Application
    Filed: February 11, 2019
    Publication date: August 15, 2019
    Applicant: MAVENIR NETWORKS, INC.
    Inventors: Wessam Afifi AHMED, Sridhar RAJAGOPAL, Ajay NIGAM, Hersh Vardhan SHUKLA, Tarak TARANEKAR, Ajit Ashok JOSHI
  • Patent number: 10383147
    Abstract: The sensing method a first vehicle user equipment (UE) for collision avoidance in a wireless communication network comprises receiving a set of scheduling assignment (SA) information allocated to a set of second vehicle UEs, decoding the set of SA information, each of which includes SA information to each of the set of second vehicle UEs, performing energy sensing operation for resources to be used by each of the set of second vehicle UEs to determine additional potential SA transmission and data transmission from the set of second vehicle UEs over the resources, determining available resources for the data transmission from the first vehicle UE based on the performed energy sensing and SA sensing, skipping a channel sensing operation on at least one subframe that is used for the data transmission from the first vehicle UE, and transmitting data among resources identified as unused in next transmissions from second vehicle UEs.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: August 13, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Thomas David Novlan, Aris Papasakellariou
  • Publication number: 20190091749
    Abstract: A method of forming a strut includes providing a ring with a threaded section, coupling a mandrel to the ring, and electroforming a metallic layer over the mandrel and ring. The strut can include an integral monolithic body.
    Type: Application
    Filed: August 27, 2018
    Publication date: March 28, 2019
    Inventors: Sridhar Rajagopal, Sagar Paramashivaiah, Merin Sebastian, Sandeep Kumar, Dattu GuruVenkata Jonnalagadda
  • Patent number: 10194388
    Abstract: In a packet-based communication system, a transmitter and a receiver implement low power synchronization techniques. The transmitter transmits a packet that includes a two-part preamble. A first part of the two-part preamble is transmitted at a first reduced bandwidth that is smaller than a second bandwidth of the channel, and at least one of a second part of the two-part preamble and another portion of the packet is transmitted at the second bandwidth of the channel. The receiver includes an interleaved analog-to-digital converter (ADC) including multiple sub-ADCs. The receiver turns on a first subset of the multiple sub-ADCs during an idle listening period, and turns on a second subset of the multiple sub-ADCs upon detection of a completion of the first part of the two-part preamble, wherein the first subset of the multiple sub-ADCs is less than the second subset of the multiple sub-ADCs.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: January 29, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Shadi Abu-Surra, Eran Pisek
  • Patent number: 10075218
    Abstract: A method for user equipment (UE) in a wireless communication network.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: September 11, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Md. Saifur Rahman, Sridhar Rajagopal, Eko Onggosanusi, Thomas David Novlan, Aris Papasakellariou
  • Publication number: 20180254839
    Abstract: A method for a transceiver calibration and antenna array operation in a multi-input multi-output (MIMO) system. The method comprises sending a calibration signal and a pre-designed training sequence, via a coupling network, receiving a calibration signal and a pre-designed training sequence that is sent a the transceiver array in a time slotted pattern via a coupling network, generating an Rx calibration measurement (R1) based on one or more uplink signals received via antenna array and the coupling network, generating a Tx calibration measurement (T1) based on receipt of the calibration signal from each of antennas via the coupling network; and performing a joint Tx/Rx (TRx) calibration based on HR, R1, and T1, where H is a channel response in air interface, R is a channel response of receivers in transceiver array.
    Type: Application
    Filed: February 7, 2018
    Publication date: September 6, 2018
    Inventors: Jin Yuan, Yang Li, Gary Xu, Robert Monroe, Jianzhong Zhang, Sridhar Rajagopal
  • Publication number: 20180248787
    Abstract: There is provided a system that includes a local cloud radio access network (RAN), and a remote cloud RAN. The local cloud RAN processes latency-sensitive applications, and the remote cloud RAN processes latency-tolerant applications. User traffic is appropriately routed to the correct cloud RAN based on the application. User equipment (UE) has no knowledge of which network is being used for processing, i.e., this network processing split is done in a manner that is transparent to the UE, e.g., by dynamically selecting a different access point name for local vs. remote processing. The processing split of the RAN between the local cloud RAN and the remote cloud RAN is done in a dynamic manner depending on the number of devices requiring low latency support. This allows the local cloud RAN to be very compact and low-cost since it does not have to process the latency-tolerant traffic.
    Type: Application
    Filed: February 23, 2018
    Publication date: August 30, 2018
    Applicant: MAVENIR NETWORKS, INC.
    Inventors: Sridhar RAJAGOPAL, Pardeep KOHLI
  • Patent number: 10064217
    Abstract: A method of base station (BS) in a wireless communication system. the method comprises identifying a set of transmission parameters comprising a numerology, wherein the numerology includes a subcarrier spacing, determining a plurality of baseband signal generation chains each of which includes the set of transmission parameters comprising different numerology, and transmitting, at least one user equipment (UE), downlink signals comprising the set of transmission parameters using a multi-user multi-input multi-output (MU-MIMO).
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: August 28, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Jianzhong Zhang, Young-Han Nam
  • Patent number: RE47182
    Abstract: A visible light communication (VLC) device is provided for use in a VLC system. The VLC device detect a trigger condition indicating a failure of a VLC link associated with first allocated resources used to communicate with a second VLC device. In response to the detection, the VLC device terminates on the first allocated resources transmission of data to the second VLC device and transmits a fast link recovery (FLR) signal using the first allocated resources. The VLC device receives a fast link recovery response (FLR RSP) signal indicating the second VLC device received the FLR signal and, in response, the VLC device resumes transmission of data to the second VLC device.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: December 25, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ying Li, Sridhar Rajagopal