Patents by Inventor Madhavan Srinivasan Vajapeyam

Madhavan Srinivasan Vajapeyam 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: 20190239194
    Abstract: In narrowband communication, channels may use repetitions in multiple subframes. SPS and DRX for the narrowband communication may not accommodate such repetitions, because repetitions for a channel may fall only partially within a DRX ON duration. An apparatus addresses this problem by determining a DRX ON duration, determining a set of subframes carrying a narrowband PDCCH candidate and determining that the DRX ON duration at least partially overlaps with the set of subframes of the narrowband PDCCH. The apparatus then refrains from decoding the first narrowband PDCCH candidate, decodes the first narrowband PDCCH candidate, or extends the DRX ON duration to include the set of subframes entirely and decoding the first narrowband PDCCH candidate carried in the set of subframes in the extended DRX ON duration. The apparatus may also determine DRX configuration parameters based on parameters of bundled channels, and handle invalid subframes for an SPS grant.
    Type: Application
    Filed: April 8, 2019
    Publication date: August 1, 2019
    Inventors: Alberto RICO ALVARINO, Madhavan Srinivasan VAJAPEYAM, Wanshi CHEN, Hao XU
  • Publication number: 20190239195
    Abstract: In eMTC, channels may be bundled, using repetitions in multiple subframes. SPS and DRX for eMTC may not accommodate such repetitions, because repetitions for a bundled channel may fall only partially within a DRX ON duration. An apparatus addresses this problem by determining a DRX ON duration, determining a set of subframes carrying a bundled M-PDCCH candidate and determining that the DRX ON duration at least partially overlaps with the set of subframes of the bundled M-PDCCH. The apparatus then refrains from decoding the first bundled M-PDCCH candidate, decodes the first bundled M-PDCCH candidate, or extends the DRX ON duration to include the set of subframes entirely and decoding the first bundled M-PDCCH candidate carried in the set of subframes in the extended DRX ON duration. The apparatus may also determine DRX configuration parameters based on parameters of bundled channels, and handle invalid subframes for an SPS grant.
    Type: Application
    Filed: April 8, 2019
    Publication date: August 1, 2019
    Inventors: Alberto RICO ALVARINO, Madhavan Srinivasan VAJAPEYAM, Wanshi CHEN, Hao XU
  • Patent number: 10355828
    Abstract: Methods, systems, and devices for communication are described. Fast error recovery procedures may be employed that decrease latency for radio link control (RLC) data packet recovery during low latency operations. A device may detect a failed low latency transmission, and may activate a timer associated with the failed transmission. The device may generate a failure report if failed transmissions are not rescheduled; for example, if the timer expires before rescheduling. The failure report may be sent to an RLC entity of the device or to a medium access control (MAC) layer entity of the scheduler. In some cases, the device may maintain a list of non-terminated transmissions for high priority bearers.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: July 16, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Madhavan Srinivasan Vajapeyam, Aleksandar Damnjanovic, Peter Gaal, Wanshi Chen, Hao Xu
  • Patent number: 10334447
    Abstract: Methods, systems, and devices for wireless communication are described. Discontinuous reception (DRX) operation may be configured differently on enhanced component carriers (eCCs) than on other component carriers, including a primary cell (PCell). In some cases, a user equipment (UE) may be configured with several different eCC DRX modes. An eCC DRX configuration may, for example, be coordinated with downlink (DL) transmission time interval (TTI) scheduling so each DRX ON duration may correspond to a DL burst duration of the corresponding eCC. The eCC DRX ON durations may also be scheduled according to hybrid automatic repeat request (HARD) process scheduling. In some examples, eCC DRX ON durations may be based on listen-before-talk (LBT) procedures. In some cases, eCC DRX ON durations may be configured to contain an uplink (UL) burst to enable channel state information (CSI) reporting. The eCC DRX may also be configured to minimize interruption of the PCell.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: June 25, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Madhavan Srinivasan Vajapeyam, Jelena Damnjanovic, Aleksandar Damnjanovic, Tao Luo, Jing Sun, Taesang Yoo, Yongbin Wei
  • Patent number: 10334465
    Abstract: UE-aided channel selection within unlicensed frequency bands. A base station may communicate with UEs using LTE/LTE-A carrier waveforms (e.g., configured as a secondary cell) in the unlicensed frequency band. The base station may configure UEs for wide-band interference feedback for channels in the unlicensed frequency band. The measurements of wide-band signal strength may be performed by the UEs on channels for which the base station is not currently transmitting, or during silent periods of a configured secondary cell. The UEs may feedback an average total received power over a measurement bandwidth for one or more frequency channels of the unlicensed frequency band. The base station may receive the wide-band signal strength feedback from the UEs and identify potential frequency channels for channel selection for the secondary cell based on its own measurements of the candidate channels, and the wide-band signal strength feedback from the UEs.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: June 25, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Madhavan Srinivasan Vajapeyam, Aleksandar Damnjanovic, Peter Gaal, Tao Luo
  • Patent number: 10327232
    Abstract: Techniques are described for wireless communication. A method for wireless communication at a base station includes identifying time resources and frequency resources for narrowband communication in a plurality of subframes, identifying a plurality of user equipment (UE) devices, allocating a first portion of the time resources and the frequency resources to an uplink (UL) channel to carry UL control information, and allocating resources of the UL channel to the identified UE devices. A method for wireless communication at a UE device includes identifying time resources and frequency resources for narrowband communication in a plurality of subframes, receiving an indication of at least a first portion of the time resources and the frequency resources allocated to a UL channel to carry UL control information for the UE device, and transmitting one or both of downlink acknowledgements (ACKs) and downlink non-acknowledgements (NAKs) on the UL channel.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: June 18, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Renqiu Wang, Wanshi Chen, Alberto Rico Alvarino, Hao Xu, Peter Gaal, Seyed Ali Akbar Fakoorian, Madhavan Srinivasan Vajapeyam
  • Publication number: 20190182002
    Abstract: Aspects of the present disclosure provide techniques for design of synchronization signals for narrowband operation, which can be used for stand-alone/in-band/guard-band deployment. An example method is provided for operations which may be performed by a base station (BS). The example method generally includes generating a primary synchronization signal (PSS) utilizing a first code sequence and a cover code applied to the first code sequence over a first number of symbols within one or more subframes, generating a secondary synchronization signal (SSS) based on a second code sequence over a second number of symbols within one or more subframes, and transmitting the PSS and the SSS in the first and second subframes to a first type of a user equipment (UE) that communicates on one or more narrowband regions of wider system bandwidth.
    Type: Application
    Filed: February 11, 2019
    Publication date: June 13, 2019
    Inventors: Jing Lei, Peter Gaal, Hao Xu, Wanshi Chen, Yongbin Wei, Xiao Feng Wang, Renqiu Wang, Seyed Ali Akbar Fakoorian, Madhavan Srinivasan Vajapeyam, Alberto Rico Alvarino, Juan Montojo
  • Patent number: 10320550
    Abstract: Techniques for estimating and reporting channel quality indicator (CQI) are disclosed. Neighboring base stations may cause strong interference to one another and may be allocated different resources, e.g., different subframes. A UE may observe different levels of interference on different resources. In an aspect, the UE may determine a CQI for resources allocated to a base station and having reduced or no interference from at least one interfering base station. In another aspect, the UE may determine multiple CQI for resources of different types and associated with different interference levels. For example, the UE may determine a first CQI based on at least one first subframe allocated to the base station and having reduced or no interference from the interfering base station(s). The UE may determine a second CQI based on at least one second subframe allocated to the interfering base station(s).
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: June 11, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Alan Barbieri, Parag Arun Agashe, Aleksandar Damnjanovic, Tingfang Ji, Tao Luo, Madhavan Srinivasan Vajapeyam, Yongbin Wei, Hao Xu, Taesang Yoo
  • Patent number: 10321447
    Abstract: In eMTC, channels may be bundled, using repetitions in multiple subframes. SPS and DRX for eMTC may not accommodate such repetitions, because repetitions for a bundled channel may fall only partially within a DRX ON duration. An apparatus addresses this problem by determining a DRX ON duration, determining a set of subframes carrying a bundled M-PDCCH candidate and determining that the DRX ON duration at least partially overlaps with the set of subframes of the bundled M-PDCCH. The apparatus then refrains from decoding the first bundled M-PDCCH candidate, decodes the first bundled M-PDCCH candidate, or extends the DRX ON duration to include the set of subframes entirely and decoding the first bundled M-PDCCH candidate carried in the set of subframes in the extended DRX ON duration. The apparatus may also determine DRX configuration parameters based on parameters of bundled channels, and handle invalid subframes for an SPS grant.
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: June 11, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Alberto Rico Alvarino, Madhavan Srinivasan Vajapeyam, Wanshi Chen, Hao Xu
  • Publication number: 20190174348
    Abstract: Certain aspects of the present disclosure generally relate to techniques for secure connectionless uplink transmissions by a wireless device. Such techniques may provide for negotiation of an encryption mechanism as part of the setup for connectionless transmissions and subsequent secure connectionless uplink transmissions.
    Type: Application
    Filed: December 4, 2018
    Publication date: June 6, 2019
    Inventors: Miguel GRIOT, Hao XU, Madhavan Srinivasan VAJAPEYAM
  • Publication number: 20190174532
    Abstract: Methods, systems, and devices for wireless communication are described. A base station may employ a multiplexing configuration based on latency and efficiency considerations. The base station may transmit a resource grant, a signal indicating the length of a downlink (DL) transmission time interval (TTI), and a signal indicating the length of a subsequent uplink (UL) TTI to one or more user equipment (UEs). The base station may dynamically select a new multiplexing configuration by, for example, setting the length of an UL TTI to zero or assigning multiple UEs resources in the same DL TTI. Latency may also be reduced by employing block feedback, such as block hybrid automatic repeat request (HARQ) feedback. A UE may determine and transmit HARQ feedback for each transport block (TB) of a set of TBs, which may be based on a time duration of a downlink TTI.
    Type: Application
    Filed: January 11, 2019
    Publication date: June 6, 2019
    Inventors: Jelena Damnjanovic, Taesang Yoo, Siddhartha Mallik, Aleksandar Damnjanovic, Arumugam Chendamarai Kannan, Madhavan Srinivasan Vajapeyam, Durga Prasad Malladi, Yongbin Wei, Tao Luo
  • Patent number: 10313916
    Abstract: Methods, systems, and devices are described for decreasing user plane latency in a wireless communication system. This may include routing a portion of bearer traffic to or from a UE through a local or serving gateway, or within or between base stations, rather than via the core network. In some examples, techniques for selected internet protocol flow ultra-low latency (SIPFULL) for systems in which users may have subscribed to enhanced services may be employed. The network may, for instance, authorize SIPFULL functionalities for UEs per access point name (APN) based on individual services subscribed by the UE to improve overall quality of service (QoS). In some examples, a UEs latency requirements or SIPFULL authorizations may affect mobility operations.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: June 4, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Jun Wang, Ozcan Ozturk, Miguel Griot, Ravindra Manohar Patwardhan, Onkar Jayant Dabeer, Madhavan Srinivasan Vajapeyam, Jelena Damnjanovic, Aleksandar Damnjanovic, Taesang Yoo, Yongbin Wei, Durga Prasad Malladi
  • Publication number: 20190166531
    Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive data from both a source base station and a target base station during handover. For example, the UE may refrain from resetting or reestablishing media access control (MAC) and packet data convergence protocol (PDCP) layer configurations until after a successful access procedure is performed with the target base station. In some cases, a single radio link control (RLC)/PDCP stack may be used during handover procedures. A source base station may, for example, forward data to a target base station after receiving a handover execution message. A UE may identify and resolve any duplicate data sent by both base stations during the transition. Additional signaling may be used (e.g., during the radio resource control (RRC) configuration) to indicate that a UE supports dual link handover.
    Type: Application
    Filed: January 30, 2019
    Publication date: May 30, 2019
    Inventors: Ozcan Ozturk, Jun Wang, Ravindra Manohar Patwardhan, Abhijit Khobare, Ajay Gupta, Madhavan Srinivasan Vajapeyam
  • Publication number: 20190165911
    Abstract: Aspects of the present disclosure provide techniques for design of synchronization signals for narrowband operation, which can be used for stand-alone/in-band/guard-band deployment. An example method is provided for operations which may be performed by a base station (BS). The example method generally includes generating a primary synchronization signal (PSS) utilizing a first code sequence and a cover code applied to the first code sequence over a first number of symbols within one or more subframes, generating a secondary synchronization signal (SSS) based on a second code sequence over a second number of symbols within one or more subframes, and transmitting the PSS and the SSS in the first and second subframes to a first type of a user equipment (UE) that communicates on one or more narrowband regions of wider system bandwidth.
    Type: Application
    Filed: January 28, 2019
    Publication date: May 30, 2019
    Inventors: Jing LEI, Peter GAAL, Hao XU, Wanshi CHEN, Yongbin WEI, Xiao Feng WANG, Renqiu WANG, Seyed Ali Akbar FAKOORIAN, Madhavan Srinivasan VAJAPEYAM, Alberto RICO ALVARINO, Juan MONTOJO
  • Patent number: 10306657
    Abstract: Various aspects described herein relate to managing ultra low latency (ULL) communications over a plurality of component carriers (CC). A configuration for aggregating a set of CCs can be received, wherein the set of CCs includes at least a primary cell and a secondary cell. Based on the received configuration, at least the primary cell can be communicated with for legacy communications, wherein the legacy communications are based on a first transmission time interval (TTI) having a first duration. Based on the received configuration, the primary cell and the secondary cell can be communicated with for ULL communications, wherein the ULL communications are based on a second TTI having a second duration that is less than the first duration.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: May 28, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Wanshi Chen, Peter Gaal, Shimman Arvind Patel, Madhavan Srinivasan Vajapeyam
  • Patent number: 10306695
    Abstract: Certain aspects of the present disclosure provide procedures for managing secondary eNB (SeNB) radio link failure (S-RLF) in dual connectivity scenarios. A user equipment (UE) may establish communication with a Master Evolved Node B (MeNB) and a Secondary eNB (SeNB). The UE may detect a Radio Link Failure (RLF) of a connection with the SeNB and may transmit an indication of the RLF to the MeNB, in response to the detection. The MeNB may take at least one action to manage the RLF, in response to receiving the indication of the RLF, for example, including transmitting a reconfiguration command to the UE. The SeNB may also detect the RLF and transmit an indication of the RLF to the MeNB over a backhaul connection, in response to the detection.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: May 28, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Madhavan Srinivasan Vajapeyam, Gavin Bernard Horn, Jelena Damnjanovic, Peter Gaal, Aleksandar Damnjanovic
  • Publication number: 20190159242
    Abstract: Techniques for uplink transmission management in a wireless communications system are described herein. An example method may include receiving an explicit uplink grant that indicates one or more implicit uplink grants. In an aspect, the example method may include performing a first clear channel assessment (CCA) in response to the explicit uplink grant in a first time slot. In another aspect, the example method may include, if the first CCA fails, sequentially performing one or more additional CCAs respectively in one or more time slots subsequent to the first time slot in response to the one or more implicit uplink grants, and transmitting the PDU over the unlicensed or shared spectrum and in a time slot subsequent to the time slot in which one of the one or more additional CCAs succeeds.
    Type: Application
    Filed: January 24, 2019
    Publication date: May 23, 2019
    Inventors: Madhavan Srinivasan VAJAPEYAM, Aleksandar DAMNJANOVIC, Tao LUO, Wanshi CHEN, Peter GAAL
  • Publication number: 20190159096
    Abstract: Techniques for managing handovers in an unlicensed radio frequency spectrum band may provide that a serving base station may receive one or more base station measurement reports and one or more UE measurement reports. The base station measurement reports may include information associated with one or more devices that may transmit signals using an unlicensed radio frequency spectrum band. The UE measurement reports may include information associated with one or more devices that may generate interfering signals at the UE, which may include interfering signals from one or more devices that are not detected by the serving base station. The serving base station may, in some examples, determine whether to handover the UE to a second base station based at least in part on the base station measurement report and the UE measurement report.
    Type: Application
    Filed: December 28, 2018
    Publication date: May 23, 2019
    Inventors: Aleksandar Damnjanovic, Madhavan Srinivasan Vajapeyam, Ravindra Manohar Patwardhan
  • Patent number: 10299244
    Abstract: Techniques are provided for transmission of small data packets through a paging procedure in a MTC or cellular internet of things system (CIoT). A core network may receive data to be transmitted to a user equipment (UE) and may determine that a small data packet transmission may be initiated for the data. The core network may format the small data packet into a paging request that includes the data and a UE identification, and transmit the paging request to a base station. The base station may receive the paging request, and initiate a page process with the UE. The UE may receive a page message, and initiate an access procedure that may be used for transmission of the small data. The UE may be in idle mode prior to the small data transmission, and in some examples may return to idle mode following the transmission of the small data.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: May 21, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Miguel Griot, Madhavan Srinivasan Vajapeyam
  • Publication number: 20190150059
    Abstract: Methods, systems, and devices for radio resource management (RRM) measurement and reporting for license assisted access (LAA) cells operating in unlicensed or shared frequency spectrum are described. A user equipment (UE) may receive an RRM measurement configuration including a channel occupancy parameter for measuring neighbor cells of a shared frequency band. The channel occupancy parameter may be used to determine a channel occupancy metric that may be sent to a base station for cell selection. The channel occupancy metric may include an averaged or filtered received signal strength and may be reported for serving cells and/or intra-frequency neighbor cells. A base station may further configure a UE with a discovery reference signals (DRS) measurement timing configuration (DMTC), which may include an extended DMTC search window. The UE may search for DRS transmissions from neighbor cells according to the DMTC.
    Type: Application
    Filed: January 16, 2019
    Publication date: May 16, 2019
    Inventors: Madhavan Srinivasan Vajapeyam, Aleksandar Damnjanovic, Peter Gaal, Tao Luo, Amir Aminzadeh Gohari, Masato Kitazoe