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).

  • Uplink Transmissions for Type 2 Relay
    Publication number: 20160081004
    Abstract: A method for providing user agent data. The method includes an access node receiving an indicator sent from a relay node as an indication that the relay node has received data from the user agent.
    Type: Application
    Filed: November 3, 2015
    Publication date: March 17, 2016
    Inventors: Zhijun Cai, Chandra Sekhar Bontu, Yi Yu, Mo-Han Fong, Sophie Vrzic, James Earl Womack, Andrew Mark Earnshaw, Yi Song
  • Smart relay network
    Patent number: 9287965
    Abstract: A wireless relay node network includes a plurality of relay devices wherein each relay device is configured to receive a first wireless signal in a first frequency band, and transmit a second wireless signal derived from the first wireless signal using a first set of network use parameters. The plurality of relay devices includes at least a first relay device and a second relay device. The first relay device is configured to select the first set of network use parameters from network resources available for communicating over the wireless relay node network based, at least in part, on a control signal received from the second relay device. The second control signal identifies a second set of network use parameters used by the second relay device.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: March 15, 2016
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, David G. Steer
  • TD LTE Secondary Component Carrier in Unlicensed Bands
    Publication number: 20160066322
    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: October 28, 2015
    Publication date: March 3, 2016
    Inventors: Chandra Sekhar Bontu, Shalini Suresh Periyalwar
  • Determining hybrid ARQ indicators
    Patent number: 9276698
    Abstract: A system and method may provide user equipment (UE)-implemented inter-cell interference mitigation. In some implementations, a method in a user equipment for Hybrid Automatic Repeat Request (HARQ) indicator determination includes separating received Physical HARQ Indicator Channel (PHICH) modulation symbols into two data streams: (1) PHICH modulation symbols including interference from Cell-specific Reference Symbol (CRS) transmissions, and (2) PHICH modulation symbols including substantially no interference from the CRS transmissions. The UE separately evaluates the PHICH modulation symbols including interference and the PHICH modulation symbols including substantially no interference. The UE determines a Hybrid ARQ indicator based upon a combination of the separate evaluations of the PHICH modulation symbols including interference and the PHICH modulation symbols including substantially no interference.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: March 1, 2016
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Yi Song, Zhijun Cai
  • Mobility parameter adjustment and mobility state estimation in heterogeneous networks
    Patent number: 9277475
    Abstract: Systems and methods for mobility parameter adjustment and mobility state estimation in heterogeneous networks are provided. The mobility parameters may be adjusted based on the cell change types associated with the mobility procedure. The mobility procedure may be a cell handover procedure or a cell reselection procedure. The cell change type may be dependent on the transmission power level of the UE's serving cell and neighboring cells. In some implementations, the UE may provide a speed information to the serving cell such that the serving eNB may prioritize or optimize the mobility procedure for the UE. The UE may also estimate its mobility state by counting the number of cell changes within certain period of time and applying scaling factors to the number of cell changes based on the associated cell change types.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: March 1, 2016
    Assignee: BlackBerry Limited
    Inventors: Yi Song, Chandra Sekhar Bontu, Zhijun Cai
  • Method and apparatus for assisted serving cell configuration in a heterogeneous network architecture
    Patent number: 9271324
    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: December 19, 2012
    Date of Patent: February 23, 2016
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Yi Song, Chandra Sekhar Bontu
  • Method and system for mobile relay enablement
    Patent number: 9258745
    Abstract: A method and network element for managing a relay node that is moving relative to a source network node, the method sending a handover request from a source network node to a target network node to prepare the handover at the target network node; sending a handover command from the source network node to the relay node without waiting for an acknowledgement of the handover request from the target network node; and detaching the relay node from the source network node.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 9, 2016
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, Yi Song, Yufei Wu Blankenship, Chandra Sekhar Bontu
  • Method and system for small cell discovery in heterogeneous cellular networks
    Patent number: 9253713
    Abstract: A method and a user equipment in a network having a macro cell and at least one small cell, the method in one embodiment receiving a measurement restriction over a broadcast channel from the macro cell; and applying the restriction for a corresponding measurement at the user equipment. In one embodiment the method includes receiving a small cell list from the macro cell; and measuring at least one of a reference signal receive power and a reference signal received quality based on the received small cell list. The method includes, in one embodiment, receiving a neighboring small cell configurations from the macro cell; and utilizing the received small cell configurations to attach to a small cell. The method includes, in one embodiment, receiving an s-measure offset value over a broadcast channel from the macro cell; and applying the s-measure offset value to an s-measure for neighbor cell discovery.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: February 2, 2016
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, Chandra Sekhar Bontu
  • Mobile device for a smart relay network
    Patent number: 9253647
    Abstract: A wireless relay node network includes a plurality of relay devices wherein each relay device is configured to receive a first wireless signal in a first frequency band, and transmit a second wireless signal derived from the first wireless signal using a first set of network use parameters. The plurality of relay devices includes at least a first relay device and a second relay device. The first relay device is configured to select the first set of network use parameters from network resources available for communicating over the wireless relay node network based, at least in part, on a control signal received from the second relay device. The second control signal identifies a second set of network use parameters used by the second relay device.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: February 2, 2016
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, David G. Steer
  • Access point for device-assisted interference management in heterogeneous wireless cellular systems
    Patent number: 9232526
    Abstract: Devices and methods are provided for device-assisted interference management in heterogeneous wireless network environments. A mobile station (MS) assists a serving access point (AP) in assigning radio resources according to the interference management capabilities of the MS, the serving AP, and one or more neighboring interfering APs on the downlink, or alternatively, to one or more neighboring APs with interfering mobile stations on the uplink.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: January 5, 2016
    Assignee: BlackBerry Limited
    Inventors: Robert Novak, Chandra Sekhar Bontu, Shalini Suresh Periyalwar
  • SYSTEMS AND METHODS FOR COEXISTENCE OF MBMS AND VoIP SERVICES
    Publication number: 20150381463
    Abstract: Systems and methods for coexistence of Multimedia Broadcast Multicast Services (MBMS) and Voice over Internet Protocol (VoIP) services are disclosed. In one embodiment, a method of operation of a network node in a cellular communications network is provided. The method includes determining a number of MBMS subframes for an MBMS allocation period. The method also includes, for each MBMS subframe of the number of MBMS subframes, assigning a frame number and a subframe number for the MBMS subframe such that a probability of a VoIP packet transmission during the MBMS subframe is mitigated. By mitigating the probability that a VoIP packet transmission occurs during a scheduled MBMS subframe, a VoIP user equipment (UE) may miss fewer packets and/or experience reduced battery drain.
    Type: Application
    Filed: September 18, 2014
    Publication date: December 31, 2015
    Inventors: Chandra Sekhar Bontu, Prabaharan Kanesalingam
  • Self-contained data transfer channel
    Patent number: 9215656
    Abstract: A data transfer system may coordinate the transfer of user data and control data using a self-contained data channel without using a separate control channel in a time period between set-up and tear-down of the self-contained data channel. For example, a plurality of data transfer resources may be established in a self-contained data channel between user equipment and a network controller. User data is transferred between the user equipment and the network controller in at least one of the plurality of data transfer resources of the self-contained data channel. Additionally, control data is transferred between the user equipment and the network controller in at least one of the plurality of data transfer resources of the self-contained data channel.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: December 15, 2015
    Assignee: BlackBerry Limited
    Inventors: Mark E. Pecen, Biswaroop Mukherjee, Shalini Suresh Periyalwar, Chandra Sekhar Bontu
  • Methods and Systems for Wireless Communication in Heterogeneous Networks
    Publication number: 20150341835
    Abstract: Systems, methods, and apparatuses for data and/or control offloading and handover in heterogeneous wireless communication networks are provided. Data and/or control packets can be offloaded to a coordinating base station while a user equipment (UE) remains associated with its serving cell. The packets are still transferred between the serving base station and the core network, and the offloaded data and/or control packets are forwarded from the serving base station to the coordinating base station for transmission to the UE. Furthermore, during a handover process, the serving base station and coordinating base station may independently schedule and send a handover command to the UE to reduce the radio link failure rate.
    Type: Application
    Filed: August 3, 2015
    Publication date: November 26, 2015
    Applicant: BLACKBERRY LIMITED
    Inventors: Chandra Sekhar Bontu, Zhijun Cai, Yi Song
  • Type II relay node initialization procedures
    Patent number: 9185717
    Abstract: A relay node including one or more components configured to encode a message to be transmitted to an access node, the message used to identify the relay node as a relay node during initialization of the relay node.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: November 10, 2015
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, Chandra Sekhar Bontu, Mo-Han Fong, Sophie Vrzic
  • System and method of encoding and transmitting codewords
    Patent number: 9184958
    Abstract: Systems and methods are provided for encoding and transmitting codewords. A message is encoded in two encoders. For at least one of the two encoders, the message is algebraically modified prior to being encoded. In a specific example, the message is algebraically modified prior to being encoded in each of two traditionally non-systematic encoders, with the result that the output is equivalent to that of a turbo encoder.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: November 10, 2015
    Assignee: BlackBerry Limited
    Inventors: Michael Eoin Buckley, Ebad Ahmed, Yufei Wu Blankenship, Chandra Sekhar Bontu, Shalini Suresh Periyalwar, Yan Xin
  • Device-assisted interference management in heterogeneous wireless cellular systems
    Patent number: 9184892
    Abstract: Devices and methods are provided for device-assisted interference management in heterogeneous wireless network environments. A mobile station (MS) assists a serving access point (AP) in assigning radio resources according to the interference management capabilities of the MS, the serving AP, and one or more neighboring interfering APs on the downlink, or alternatively, to one or more neighboring APs with interfering mobile stations on the uplink.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: November 10, 2015
    Assignee: BlackBerry Limited
    Inventors: Robert Novak, Chandra Sekhar Bontu, Shalini Suresh Periyalwar
  • TD LTE secondary component carrier in unlicensed bands
    Patent number: 9184886
    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: August 10, 2012
    Date of Patent: November 10, 2015
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Shalini Suresh Periyalwar
  • IDENTIFYING A SUBFRAME CONTAINING INFORMATION RELATING TO AN UPLINK GRANT
    Publication number: 20150319774
    Abstract: A user equipment (UE) receives a message identifying a subframe containing information relating to an uplink grant to be sent by a target cell.
    Type: Application
    Filed: May 5, 2014
    Publication date: November 5, 2015
    Applicant: BLACKBERRY LIMITED
    Inventors: Zhijun Cai, Chandra Sekhar Bontu, Yi Song
  • Methods and apparatus for enabling further enhancements to flexible subframes in LTE heterogeneous networks
    Patent number: 9155077
    Abstract: A method is provided for communication in a wireless telecommunication network. The method comprises providing, by a network element, one of an uplink grant or a downlink grant to at least one UE that the network element has determined, based on information received from a plurality of UEs, is closer to the network element than is another UE, wherein the uplink grant is scheduled such that the UE transmits to the network element only during at least one flexible subframe, and wherein the downlink grant is scheduled such that the network element transmits to the UE only during at least one flexible subframe. The method further comprises transmitting, by the network element, to at least one UE that the network element has determined, based on information received from a plurality of UEs, is closer to the network element than is another UE, only during at least one flexible subframe.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 6, 2015
    Assignee: BlackBerry Limited
    Inventors: Yi Song, Chandra Sekhar Bontu, Zhijun Cai
  • ENHANCING GROUP COMMUNICATION SERVICES
    Publication number: 20150281912
    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: Application
    Filed: March 28, 2014
    Publication date: October 1, 2015
    Inventors: Zhijun Cai, Chandra Sekhar Bontu, Yi Song