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: 9144010
    Abstract: A method and user equipment in a network having a macro cell and at least one small cell, the method receiving, from a network element, a plurality of small cell measurement configurations and at least one condition for utilizing each of the plurality of small cell measurement configurations; determining whether a condition is satisfied for one of the plurality of small cell measurement configurations; and configuring small cell measurement on the user equipment based on the one of the plurality of small cell measurement configurations for which the condition is satisfied. Further, a method at the network element, the method sending, from the network element to at least one user equipment, a plurality of small cell measurement configurations and at least one condition for utilizing each of the plurality of small cell measurement configurations.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: September 22, 2015
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Yi Song, Chandra Sekhar Bontu
  • Patent number: 9137836
    Abstract: Systems and methods for user equipment (UE) for inter-device communication authorization and data sniffing in wireless communication systems are provided. A UE may communicate directly with another UE over a direct inter-device communication link when they are located in proximity. The UE may receive data sniffing related parameters corresponding to the inter-device communication link from a network entity, e.g. a mobile management entity (MME). The UE may store data exchanged over the inter-device communication link in a buffer and upload the stored data to a secure server in a network periodically or upon receiving a request from the network. Long term evolution (LTE) downlink or uplink radio resources may be used for the data exchange over the inter-device communication link.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: September 15, 2015
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Yi Song, Zhijun Cai
  • Patent number: 9131513
    Abstract: A controller receives information relating to at least one of multiple small cells. Responsive to the received information, the controller coordinates allocation of resources for use by the small cells in communicating data with respective user equipments (UEs), where the coordinating of the allocation of resources reduces interference among the small cells.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: September 8, 2015
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Yi Song, Chandra Sekhar Bontu, David Nigel Freeman
  • Patent number: 9100883
    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: Grant
    Filed: April 3, 2013
    Date of Patent: August 4, 2015
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Zhijun Cai, Yi Song
  • Patent number: 9084264
    Abstract: A method at a UE operating in a hybrid network, the method receiving a separate discontinuous reception configuration at the UE for the macro cell than for a small cell; and configuring a receiver on the UE according to the separate discontinuous reception configurations. Further, a method at a macro cell, the method determining a mobility state of a UE; finding a service at the UE; and limiting the UE to associate only with the macro cell based on at least one of the determining and the finding. Further, a method at a UE in an environment with a macro and small cell using the same frequency, including receiving a first allocation for small cell within a common small HARQ subframe set; and receiving a second allocation for a macro cell within a common macro HARQ subframe set, wherein the sets do not overlap.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: July 14, 2015
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Chandra Sekhar Bontu, Yi Song
  • Patent number: 9072021
    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: June 30, 2015
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Yi Song, Chandra Sekhar Bontu
  • Publication number: 20150147995
    Abstract: A method at a mobile device, including receiving, at the mobile device, an emergency alert message from a base station; determining a response is required for the emergency alert message; and sending the response to the base station.
    Type: Application
    Filed: November 27, 2013
    Publication date: May 28, 2015
    Inventors: Chandra Sekhar Bontu, Shalini Suresh Periyalwar, James Earl Womack, Zhijun Cai
  • Patent number: 9036578
    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: May 19, 2015
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Yi Song, Chandra Sekhar Bontu
  • Patent number: 9014113
    Abstract: User equipment (UE) architecture for inter-device communication in wireless communication systems is provided. A UE may communicate directly with another UE over a direct inter-device communication link when they are located in proximity. Long term evolution (LTE) downlink or uplink radio resources may be used for communications over the inter-device communication link. The UE may simultaneously maintain an active communication link with its serving base station while communicating with other UEs over the inter-device communication link. To communicate with the base station and other UEs simultaneously, the UE may include additional transmit or receive chain to support the inter-device communications over the inter-device communication link.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: April 21, 2015
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Yi Song, Zhijun Cai
  • Patent number: 9014171
    Abstract: A method, at a first network access device of a heterogeneous network, the method sending a report to a second network access device indicating a user equipment (UE) in the vicinity of the second network access device to be handled in the uplink by the second network access device; receiving an uplink timing control report from the second network access device; transmitting uplink timing control adjustments to the UE; allocating uplink resources for the second network access device to forward uplink information; allocating physical downlink control channel (‘PDCCH’) resources belonging to the first network access device for transmitting uplink scheduling information provided by the second network access device to the UE; receiving uplink information including uplink scheduling information from the second network access device at the first network access device; and sending the uplink scheduling information to the UE.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: April 21, 2015
    Assignee: BlackBerry Limited
    Inventors: Jianfeng Weng, Shiguang Guo, Chandra Sekhar Bontu, Andrew Mark Earnshaw
  • Publication number: 20150105084
    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: Application
    Filed: October 11, 2013
    Publication date: April 16, 2015
    Applicant: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Zhijun Cai, Yi Song
  • Patent number: 9008720
    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: April 14, 2015
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, Chandra Sekhar Bontu
  • Publication number: 20150092676
    Abstract: A system and method may use mm-wave superspots to download high volumes of data to a moving or stationary mobile device traveling along a travel route that the moving mobile device is traveling. A macrocell in communication with the mobile device may predict the route that the mobile device is traveling, such as via GPS location, moving speed and direction, map information, etc. Alternatively, the route being taken may be determined by wireless communication, such as between the mobile device and a macrocell and/or superspot. The macrocell and/or superspot may determine whether (1) there are any mm-wave superspots along the predicted or known route that the mobile device is taking; (2) there is any data that is requested or remaining to download to the moving mobile device; and/or (3) the received signal quality, channel conditions, and/or macrocell traffic to the mobile device are favorable for superspot downloading.
    Type: Application
    Filed: September 30, 2013
    Publication date: April 2, 2015
    Applicant: BlackBerry Limited
    Inventors: Shalini Suresh Periyalwar, Chandra Sekhar Bontu, James Earl Womack, Yan Xin, David Gywn Steer
  • Patent number: 8982895
    Abstract: Systems, methods, and apparatuses for inter-device communication in wireless communication systems are provided. A user equipment (UE) may communicate directly with another UE over a direct inter-device communication link when they are located in proximity. The UE may simultaneously maintain an active communication link with its serving base station while communicating with other UEs over the inter-device communication link. Long term evolution (LTE) downlink or uplink radio resources may be used for communications over the inter-device communication link. Further, radio link parameters may be chosen specifically for the inter-device communication link.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: March 17, 2015
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Yi Song, Zhijun Cai
  • Publication number: 20150071183
    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: Application
    Filed: September 10, 2013
    Publication date: March 12, 2015
    Inventors: Chandra Sekhar Bontu, Yi Song, Zhijun Cai
  • Patent number: 8964705
    Abstract: Described herein is a network element with a processor. The processor is configured to promote transmitting a first physical resource block (PRB) pair that contains a first demodulation reference signal (DMRS) pattern. The processor is further configured to promote transmitting a second PRB pair that contains a second DMRS pattern. The first DMRS pattern is a subset of the second DMRS pattern.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: February 24, 2015
    Assignee: BlackBerry Limited
    Inventors: Hua Xu, Shiwei Gao, Yajun Zhu, Zhijun Cai, Chandra Sekhar Bontu, Yi Song
  • Publication number: 20150050940
    Abstract: A controller receives information relating to at least one of multiple small cells. Responsive to the received information, the controller coordinates allocation of resources for use by the small cells in communicating data with respective user equipments (UEs), where the coordinating of the allocation of resources reduces interference among the small cells.
    Type: Application
    Filed: August 16, 2013
    Publication date: February 19, 2015
    Applicant: BLACKBERRY LIMITED
    Inventors: Zhijun Cai, Yi Song, Chandra Sekhar Bontu, David Nigel Freeman
  • Publication number: 20150016335
    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: Application
    Filed: September 26, 2014
    Publication date: January 15, 2015
    Inventors: Yi Yu, Zhijun Cai, Chandra Sekhar Bontu, Mo-Han Fong, Sophie Vrzic
  • Patent number: 8917668
    Abstract: A system and method for entering and exiting energy savings power mode in a wireless network is provided. According to an aspect, a request message for requesting entry of a node into energy serving is generated at an anchor node. The request message is sent and the node that receives it enters an energy saving mode. The request can be implemented as an X2-application protocol message and can include indicators for timing of entry into energy saving mode, resources to be reserved and the state of energy saving mode to be entered into. The nodes can take the form of anchor nodes and non-anchor nodes as well as macro nodes and small nodes. Modified versions of X2-application protocol messages eNB configuration update, cell activation request and cell activation response can also be used to assist a node in entering and exiting energy savings power mode.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: December 23, 2014
    Assignee: Blackberry Limited
    Inventors: Yi Song, Chandra Sekhar Bontu, Zhijun Cai, Rene Waraputra Purnadi
  • Publication number: 20140369245
    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: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventors: Mark E. Pecen, Biswaroop Mukherjee, Shalini Suresh Periyalwar, Chandra Sekhar Bontu