Patents by Inventor Chandra Sekhar Bontu

Chandra Sekhar Bontu 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: 10979119
    Abstract: Embodiments of a method in a base station for precoding a downlink transmission are disclosed. In some embodiments, the method comprises obtaining, for a time instant k, an estimate of a channel matrix for a wireless channel for a downlink from the base station to a wireless device and projecting the estimate of the channel matrix onto one or more sets of spatial orthonormal functions, thereby obtaining respective sets of coefficients. The method further comprises, for each set of spatial orthonormal functions, filtering the set of coefficients for the time instant k based on a filtering parameter that is specific to a downlink channel to be transmitted. The method further comprises generating beamforming weights using the filtered set of coefficients for at least one of the sets of spatial orthonormal functions, and precoding the downlink channel using the beamforming weights.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: April 13, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Mats Åhlander, Magnus Hurd, Anders Johansson, Hong Ren
  • Patent number: 10904877
    Abstract: A method is provided for communication in a wireless telecommunication system. The method comprises adaptively designating, by a network element following a frame-based communication protocol, for use as a secondary component carrier in a carrier aggregation scheme, at least a portion of radio resources on an unlicensed band.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: January 26, 2021
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Shalini Suresh Periyalwar
  • Patent number: 10904713
    Abstract: In some implementations, a method in a user equipment (UE) for supporting group communication service includes receiving, from a base station, a group communication on a Physical Downlink Shared Channel (PDSCH). The UE determines a first Hybrid Automatic Repeat reQuest (HARQ) information that corresponds to the group communication on the PDSCH. The UE transmits the first HARQ information. In some implementations, the UE determines a group Channel State Information (CSI) for a group communication that is transmitted by a base station on a PDSCH. The UE determines a unicast CSI for a unicast communication that is transmitted by the base station on the PDSCH. The UE transmits the group CSI. The UE transmits the unicast CSI.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: January 26, 2021
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Chandra Sekhar Bontu, Yi Song
  • Patent number: 10897334
    Abstract: A node including processing circuitry including a processor, and a memory, the memory containing instructions that, when executed by the processor, configure the processor to: determine a cluster of a plurality of cells, assign at least one ZP CSI-RS configuration to each of the plurality of cells of the cluster, assign to each cell in the plurality of cells of the cluster a respective NZP CSI-RS configuration in which each of the NZP CSI-RS configurations assigned to respective cells in the cluster partially overlapping the at least one ZP CSI-RS configuration, and cause a first cell of the plurality of cells of the cluster to transmit, within a subframe, based on the at least one ZP CSI-RS configuration and the NZP CSI-RS configuration assigned to the first cell.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: January 19, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Chandra Sekhar Bontu, Girum Alebachew Fantaye, Mercy George, Jianguo Long, Hua Xu
  • Publication number: 20210006316
    Abstract: Systems and methods for estimating Signal-to-Noise Ratio (SNR) for Multi-User Multiple-Input and Multiple-Output (MU-MIMO) based on channel orthogonality. In some embodiments, a method performed by a radio access node includes obtaining a SU-MIMO signal quality measurement for at least a first user and an additional user; obtaining an indication of orthogonality between a channel of the first user and a channel of the additional user; and estimating a MU-MIMO signal quality measurement for the first user as if the first user and the additional user are paired with each other for a potential MU-MIMO transmission based on the SU-MIMO signal quality measurements and the indication of orthogonality. In this way, a computational complexity for the SINR estimation of MU-MIMO users can be greatly reduced. This may enable a large number of user pairing alternatives to be evaluated in practical wireless systems to achieve improved MU-MIMO performance.
    Type: Application
    Filed: February 28, 2019
    Publication date: January 7, 2021
    Inventors: Jianguo Long, Mats Åhlander, Chandra Sekhar Bontu, Yongquan Qiang, Hong Ren
  • Publication number: 20200403673
    Abstract: Embodiments of a method in a base station for precoding a downlink transmission are disclosed. In some embodiments, the method comprises obtaining, for a time instant k, an estimate of a channel matrix for a wireless channel for a downlink from the base station to a wireless device and projecting the estimate of the channel matrix onto one or more sets of spatial orthonormal functions, thereby obtaining respective sets of coefficients. The method further comprises, for each set of spatial orthonormal functions, filtering the set of coefficients for the time instant k based on a filtering parameter that is specific to a downlink channel to be transmitted. The method further comprises generating beamforming weights using the filtered set of coefficients for at least one of the sets of spatial orthonormal functions, and precoding the downlink channel using the beamforming weights.
    Type: Application
    Filed: April 18, 2018
    Publication date: December 24, 2020
    Inventors: Chandra Sekhar BONTU, Mats ÅHLANDER, Magnus HURD, Anders JOHANSSON, Hong REN
  • Patent number: 10856233
    Abstract: A method and network entity for extending communication coverage in a network between a network entity and a wireless device. The method includes determining that the wireless device qualifies for coverage extension, the determining including that deriving appropriate transmission parameters for the wireless devices results in one of a lowest possible or most robust modulation and coding scheme (MCS), and determining achievable transmission performance parameters for the wireless device. If the determined achievable transmission performance parameters do not meet a set of pre-established transmission criteria, the downlink transmission power to the wireless device is increased.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: December 1, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Peter Hazy, Michael McKenna
  • Patent number: 10798649
    Abstract: Methods, systems and apparatus are provided for camping, assisted serving cell addition or removal, and discontinuous reception (DRX) in networks having a macro cell and at least one assisted serving cell. In other aspects, enhancements to Layer 1 channels and uplink timing alignments are provided in networks having a macro cell and at least one assisted serving cell. In further aspects, assisted serving cell Layer 2 architecture and transport channels are provided in networks having a macro cell and at least one assisted serving cell. In further aspects, collaborated HARQ solutions are provided in networks having a macro cell and at least one assisted serving cell.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: October 6, 2020
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Yi Song, Chandra Sekhar Bontu
  • Publication number: 20200314785
    Abstract: Described herein is a system with a first network element and a second network element. The first network element contains a processor configured to synchronize with the second network element; and maintain synchronization with the second network element. The first network element is a small cell eNB and the second network element is one of the following: a macro cell enhanced node-B (eNB); or a small cell eNB.
    Type: Application
    Filed: June 16, 2020
    Publication date: October 1, 2020
    Inventors: Hua Xu, Shiwei Gao, Yajun Zhu, Zhijun Cai, Chandra Sekhar Bontu, Yi Song
  • Patent number: 10694481
    Abstract: Described herein is a system with a first network element and a second network element. The first network element contains a processor configured to synchronize with the second network element; and maintain synchronization with the second network element. The first network element is a small cell eNB and the second network element is one of the following: a macro cell enhanced node-B (eNB); or a small cell eNB.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: June 23, 2020
    Assignee: BlackBerry Limited
    Inventors: Hua Xu, Shiwei Gao, Zhijun Cai, Chandra Sekhar Bontu, Yi Song, Yajun Zhu
  • Patent number: 10673558
    Abstract: A method and network node for performing link adaption are disclosed. In one embodiment, a channel state information, CSI, measurement is received from a wireless device. An information carrying capacity, ICC, over a number of scheduling blocks, SBs, for a plurality of modulation formats for a target criteria is determined based at least in part on the CSI measurement from the wireless device. A modulation format of the plurality of modulation formats with a maximum ICC is selected. A transport block size, TBS, is determined for the selected modulation format. Link adaptation is performed based on the determined TBS.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: June 2, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Michel Chauvin, Peter Hazy, Michael McKenna
  • Patent number: 10455612
    Abstract: A network element in a first cell in a wireless telecommunication network is provided. The network element comprises a processor configured such that the network element provides uplink and downlink grants in the first cell, wherein the first cell is a low-power cell within the coverage area of a second, high-power cell, and wherein the first cell acts as a secondary cell and the second cell acts as a primary cell in a carrier aggregation mode, and wherein at least one uplink control signal is received by one of only the first cell or both the first cell and the second cell.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: October 22, 2019
    Assignee: BlackBerry Limited
    Inventors: Yi Song, Chandra Sekhar Bontu, Zhijun Cai
  • Patent number: 10447455
    Abstract: A method for using a high order modulation (HoM) mode for communications with a wireless device in a wireless communication network is provided. The method includes receiving downlink channel quality indicator (CQI) information from an uplink transmission of the wireless device and determining a downlink channel quality estimate from the CQI information. When a measurement of the downlink channel quality estimate satisfies the predetermined criteria for a first predetermined number of consecutive uplink transmissions from the wireless device, a downlink transmission mode of the wireless device is switched from a first modulation mode to the HoM mode.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: October 15, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Xixian Chen, Kevin Luo, Hong Ren, Hua Xu
  • Publication number: 20190297630
    Abstract: A method and system for performing link adaptation are disclosed. According to one aspect, a method in a wireless communication system for performing link adaptation is provided. The method includes, when a first measure of channel quality is higher than a first predetermined amount, using a first outer loop adjustment process directed to determining link adaptation for a first data transmission transmitted to a wireless device. The method also includes, when the first measure of channel quality is lower than a second predetermined amount, using a second outer loop adjustment process different from the first outer loop adjustment process directed to determining link adaptation for a second data transmission transmitted to the wireless device.
    Type: Application
    Filed: June 7, 2016
    Publication date: September 26, 2019
    Inventors: Xixian CHEN, Chandra Sekhar BONTU, Jianguo LONG, James Jianfeng WENG
  • Patent number: 10419233
    Abstract: The present disclosure relates to a Multimedia Broadcast Multicast Service (MBMS), and in particular to a method, system and network entity for configuring transmission parameters for providing MBMS service(s). In one embodiment, a network entity in communication with a plurality of network nodes within a geographical area is provided. The network entity includes a communication interface configured to receive a representation of signal quality measurement data associated with a plurality of non-Multimedia Broadcast Multicast Service, non-MBMS, user equipments, UEs. Each UE is served by at least one of the plurality network nodes. The network entity includes a processor communicatively coupled to the communication interface. The processor is configured to determine a combined signal quality data of a plurality of MBMS UEs based at least in part on the received representation of signal quality measurement data associated with the plurality of non-MBMS UEs.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: September 17, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Prabaharan Kanesalingam
  • Patent number: 10278202
    Abstract: Systems and methods related to scheduling for a cluster of cells controlled by a base station of a cellular communications network are disclosed. In some embodiments, a method of operation of a base station in a cellular communications network to provide scheduling for a cluster of cells controlled by the base station is provided. In some embodiments, the method of operation of the base station comprises identifying a first set of Radio Access Bearers (RABs) for cluster scheduling for a Transmit Time Interval (TTI) and a second set of RABs for individual cell scheduling for the TTI, where the first set of RABs and the second set of RABs are non-overlapping sets. The method further includes performing cluster scheduling for the first set of RABs for the TTI and performing individual cell scheduling for the second set of RABs for the TTI.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: April 30, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Peter Hazy, Patrick Lie Chin Cheong
  • Publication number: 20190116558
    Abstract: A method and network entity for extending communication coverage in a network between a network entity and a wireless device. The method includes determining that the wireless device qualifies for coverage extension, the determining including that deriving appropriate transmission parameters for the wireless devices results in one of a lowest possible or most robust modulation and coding scheme (MCS), and determining achievable transmission performance parameters for the wireless device. If the determined achievable transmission performance parameters do not meet a set of pre-established transmission criteria, the downlink transmission power to the wireless device is increased.
    Type: Application
    Filed: June 27, 2016
    Publication date: April 18, 2019
    Inventors: Chandra Sekhar BONTU, Peter HAZY, Michael MCKENNA
  • Publication number: 20190028233
    Abstract: A method and network node for performing link adaption are disclosed. In one embodiment, a channel state information, CSI, measurement is received from a wireless device. An information carrying capacity, ICC, over a number of scheduling blocks, SBs, for a plurality of modulation formats for a target criteria is determined based at least in part on the CSI measurement from the wireless device. A modulation format of the plurality of modulation formats with a maximum ICC is selected. A transport block size, TBS, is determined for the selected modulation format. Link adaptation is performed based on the determined TBS.
    Type: Application
    Filed: May 18, 2016
    Publication date: January 24, 2019
    Inventors: Chandra Sekhar BONTU, Michel CHAUVIN, Peter HAZY, Michael MCKENNA
  • Patent number: 10178596
    Abstract: A method at a user equipment for handover from a serving cell to a target cell, the method sending a measurement report to the serving cell; and transmitting a reconfiguration complete message to the target cell; wherein the measurement report includes downlink timing measurements for the target cell. Further, a method at a source network element for handover of a user equipment from the source network element to a target network element, the method receiving a measurement report from the user equipment; sending a handover request to the target network element; receiving a handover request acknowledgement from the target network element, the handover request acknowledgement including a reconfiguration message and at least one downlink subframe in which an uplink grant is expected at the target network element for the user equipment; and forwarding the reconfiguration message and at least one downlink subframe to the user equipment.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: January 8, 2019
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Yi Song, Zhijun Cai
  • Publication number: 20180376475
    Abstract: A method is provided for communication in a wireless telecommunication system. The method comprises adaptively designating, by a network element following a frame-based communication protocol, for use as a secondary component carrier in a carrier aggregation scheme, at least a portion of radio resources on an unlicensed band.
    Type: Application
    Filed: May 25, 2018
    Publication date: December 27, 2018
    Inventors: Chandra Sekhar Bontu, Shalini Suresh Periyalwar