Patents by Inventor Zhijun Cai

Zhijun Cai 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: 20190053225
    Abstract: A method for informing a relay node when to receive data. The method includes the relay node being informed of a fixed point in a subframe of data when an access node will begin transmitting relevant data over a physical downlink shared channel. The method further includes the relay node beginning to receive data at approximately the fixed point.
    Type: Application
    Filed: October 15, 2018
    Publication date: February 14, 2019
    Inventors: Yi Yu, Zhijun Cai, James Earl Womack
  • Publication number: 20190028935
    Abstract: A user equipment (UE) receives, from a plurality of wireless access network nodes, respective indicators, where the UE is concurrently connected to the plurality of wireless access network nodes. The UE determines, based on the indicators, a split of uplink data in a buffer of the UE into a plurality of uplink data portions for transmission by the UE to the respective wireless access network nodes.
    Type: Application
    Filed: September 20, 2018
    Publication date: January 24, 2019
    Inventor: Zhijun Cai
  • 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
  • Patent number: 10178651
    Abstract: A method and apparatus for operating a user equipment (UE) in a wireless communications network, the method separately encoding and rate matching a first set of information bits and a second set of information bits; mapping and concatenating the encoded and rate matched first set of information bits with the encoded and rate matched second set of information bits, thereby creating a bit stream; and modulating and transmitting the bit stream.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: January 8, 2019
    Assignee: BlackBerry Limited
    Inventors: Joon Beom Kim, Zhijun Cai
  • Patent number: 10154467
    Abstract: Systems and methods for user equipment (UE) transmit power adjustment for inter-device communication 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 adjust its transmit power for the inter-device communication during a device handshake/discovery procedure. For example, the UE may adjust its transmit power for the inter-device communication based on a data exchange between the UE and the other UE over the inter-device communication link. 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: September 26, 2012
    Date of Patent: December 11, 2018
    Assignee: BlackBerry Limited
    Inventors: Chandra Sekhar Bontu, Yi Song, Zhijun Cai
  • Publication number: 20180343630
    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: May 24, 2018
    Publication date: November 29, 2018
    Inventors: Hua Xu, Shiwei Gao, Zhijun Cai, Chandra Sekhar Bontu, Yi Song, Yajun Zhu
  • Patent number: 10135517
    Abstract: A method for preventing a first network node from missing a transmission from a second network node. The method includes, when a ten millisecond periodicity is used for Multicast/Broadcast Single Frequency Network (MBSFN) subframes, setting a time between an uplink grant from the second network node to the first network node and an acknowledgement/negative-acknowledgement message (ACK/NACK) from the second network node to the first network node equal to ten milliseconds. The method further includes, when a forty millisecond periodicity is used for MBSFN subframes, the second network node sending the first network node an asynchronous grant for an uplink retransmission when a data packet is missed, and when the first network node receives the grant for the uplink retransmission, the first network node retransmitting the missed data packet.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: November 20, 2018
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, James Earl Womack, Andrew Mark Earnshaw
  • Publication number: 20180331810
    Abstract: A method for processing a control channel at a user agent (UA) to identify at least one of an uplink and a downlink resource allocated by a resource grant within a multi-carrier communication system wherein resource grants are specified by control channel element (CCE) subset candidates, the method comprising the steps of identifying the number of configured carriers used to communicate with the access device, based on the number of configured carriers used to communicate with the access device, identifying a number of CCE subset candidates to decode and decoding up to the identified number of CCE subset candidates in an attempt to identify the resource grant.
    Type: Application
    Filed: June 13, 2018
    Publication date: November 15, 2018
    Applicant: Guangdong OPPO Mobile Telecommunications Corp., Ltd.
    Inventors: Sean McBeath, Mo-han Fong, Zhijun Cai, Mark Earnshaw, Youn Hyong Heo
  • Publication number: 20180331811
    Abstract: A method for processing a control channel at a user agent (UA) to identify at least one of an uplink and a downlink resource allocated by a resource grant within a multi-carrier communication system wherein resource grants are specified by control channel element (CCE) subset candidates, the method comprising the steps of identifying the number of configured carriers used to communicate with the access device, based on the number of configured carriers used to communicate with the access device, identifying a number of CCE subset candidates to decode and decoding up to the identified number of CCE subset candidates in an attempt to identify the resource grant.
    Type: Application
    Filed: June 13, 2018
    Publication date: November 15, 2018
    Applicant: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
    Inventors: Sean MCBEATH, Mo-han Fong, Zhijun Cai, Mark Earnshaw, Youn Hyoung Heo
  • Patent number: 10129812
    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: Grant
    Filed: November 3, 2015
    Date of Patent: November 13, 2018
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Chandra Sekhar Bontu, Yi Yu, Mo-Han Fong, Sophie Vrzic, James Earl Womack, Andrew Mark Earnshaw, Yi Song
  • Publication number: 20180324693
    Abstract: Devices and methods are provided for reducing client node power consumption when monitoring first and second channels corresponding to first and second access nodes in a heterogeneous wireless-enabled communications environment. Enhanced Inter-Cell Interference Coordination (eICIC) operations are performed to mitigate interference between a first access node and a second access node. The client node monitors first and second channels corresponding to the first and second access nodes to detect the presence of Almost Blank Subframes (ABS) pattern data transmitted on the first channel. When detected, the client node ceases monitoring the first channel to reduce power consumption and thereby conserve battery resources.
    Type: Application
    Filed: February 11, 2011
    Publication date: November 8, 2018
    Applicant: BLACKBERRY LIMITED
    Inventors: Yi Yu, Yi Song, Zhijun Cai, Mo-han Fong, Takashi Suzuki
  • Patent number: 10123304
    Abstract: A system for providing a multicast control channel (MCCH) including information related to a service is provided. The system includes a processor programmed to promote transmission of a MCCH including a multi-cell information portion that contains information common to a plurality of cells in a wireless telecommunications network, and a cell-specific information portion that contains information specific to one of the cells. A method for providing control information is also provided. The method includes transmitting a multicast control channel (MCCH) including information related to a service, wherein the MCCH has a cell-specific portion that contains information specific to a specific cell in a telecommunications network, and wherein the MCCH has a multi-cell portion that contains information common to a plurality of cells in the telecommunications network.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: November 6, 2018
    Assignee: BlackBerry Limited
    Inventor: Zhijun Cai
  • Patent number: 10123310
    Abstract: Methods, devices, and systems for the transmission of information in a wireless communication system are disclosed. In one embodiment, a method for the transmission of information in a wireless communication system comprises receiving a downlink message, wherein the downlink message includes a first control channel element; determining a first index using the location of the first control channel element; determining a second index; determining a first orthogonal resource using the first index; determining a second orthogonal resource using the second index; spreading an uplink message using the first orthogonal resource to form a first spread signal; spreading the uplink message using a second orthogonal resource to form a second spread signal; transmitting the first spread signal using a first antenna; and transmitting the second spread signal using a second antenna.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: November 6, 2018
    Assignee: BlackBerry Limited
    Inventors: Hua Xu, Youn Hyoung Heo, Zhijun Cai, Andrew Mark Earnshaw, Mo-Han Fong, Sean Michael McBeath, Robert Mark Harrison
  • Publication number: 20180313061
    Abstract: A control system for a machine includes multiple sensors coupled to multiple parts on the machine. The multiple sensors generate data indicative of motion of the multiple parts of the machine. The control system includes a controller in communication with the multiple sensors. The controller receives the data indicative of motion of the multiple parts of the machine from the multiple sensors. The controller determines a segment of the work cycle being currently performed by the machine based on the data received by the multiple sensors, and multiple membership functions. The controller generates productivity data of the machine based on the determined segment of the work cycle. Furthermore, the controller displays the productivity data of the machine on a display system.
    Type: Application
    Filed: April 26, 2017
    Publication date: November 1, 2018
    Applicant: Caterpillar Inc.
    Inventors: Zhijun Cai, Bradley K. Bomer, Nolan Graves, Allen DeClerk
  • Patent number: 10111211
    Abstract: A method for informing a relay node when to receive data. The method includes the relay node being informed of a fixed point in a subframe of data when an access node will begin transmitting relevant data over a physical downlink shared channel. The method further includes the relay node beginning to receive data at approximately the fixed point.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: October 23, 2018
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, James Earl Womack
  • Publication number: 20180302855
    Abstract: A system and method are disclosed for providing uplink timing synchronization during DRX operation in a wireless communication system.
    Type: Application
    Filed: June 15, 2018
    Publication date: October 18, 2018
    Inventors: James Earl Womack, Yi Yu, Zhijun Cai
  • Patent number: 10104584
    Abstract: A user equipment (UE) receives, from a plurality of wireless access network nodes, respective indicators, where the UE is concurrently connected to the plurality of wireless access network nodes. The UE determines, based on the indicators, a split of uplink data in a buffer of the UE into a plurality of uplink data portions for transmission by the UE to the respective wireless access network nodes.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: October 16, 2018
    Assignee: BlackBerry Limited
    Inventor: Zhijun Cai
  • Publication number: 20180295576
    Abstract: A system and method are disclosed for providing uplink timing synchronization during DRX operation in a wireless communication system.
    Type: Application
    Filed: June 15, 2018
    Publication date: October 11, 2018
    Inventors: James Earl Womack, Yi Yu, Zhijun Cai
  • Publication number: 20180295577
    Abstract: A system and method are disclosed for providing uplink timing synchronization during DRX operation in a wireless communication system.
    Type: Application
    Filed: June 15, 2018
    Publication date: October 11, 2018
    Inventors: James Earl Womack, Yi Yu, Zhijun Cai
  • Publication number: 20180295575
    Abstract: A system and method are disclosed for providing uplink timing synchronization during DRX operation in a wireless communication system.
    Type: Application
    Filed: June 15, 2018
    Publication date: October 11, 2018
    Inventors: James Earl Womack, Yi Yu, Zhijun Cai