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: 20190310279
    Abstract: A method at a sensor apparatus, the method including calculating a value for a target function based on at least one sensor of the sensor apparatus; determining that the value of the target function is within a defined threshold range for a defined time period, thereby finding an in-flight state for the sensor apparatus; and turning off transmission from a radio of the sensor apparatus based on the in-flight state.
    Type: Application
    Filed: April 10, 2018
    Publication date: October 10, 2019
    Inventors: Zhijun Cai, Shouxing Qu, Yu Gao, Gaƫlle Christine Martin-Cocher, Jesse William Bennett
  • Patent number: 10425934
    Abstract: A method and system to signal transmission layers or dedicated reference signal ports to be used in a multiple input multiple output system, the method including providing a downlink control signal containing information for transmission layers or dedicated reference signal ports utilized, the dedicated reference signal ports being associated with the transmission layers; and using the information to demodulate data on each transmission layer.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: September 24, 2019
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, Sean Michael McBeath, Hua Xu, Yongkang Jia, Youn Hyoung Heo, Andrew Mark Earnshaw, Mo-Han Fong, Robert Mark Harrison
  • Publication number: 20190289546
    Abstract: Methods and apparatus for controlling discontinuous reception on a mobile device and in particular to control a short discontinuous reception timer in response to receipt of a medium access control control element. The methods and apparatus include stopping, restarting or maintaining the short discontinuous reception timer. Methods and apparatus for limiting or stopping a retransmission timer by providing user equipment with a maximum retry value for transmissions, by providing a maximum redundant version value, or by providing a medium access control control element to stop or prevent the start of a retransmission timer.
    Type: Application
    Filed: June 3, 2019
    Publication date: September 19, 2019
    Applicant: BlackBerry Limited
    Inventors: Zhijun Cai, James Earl Womack, Takashi Suzuki, Gordon Peter Young, Yi Yu
  • Publication number: 20190289566
    Abstract: Information is communicated indicating whether a cell on a first carrier of a first type is to be used as a reference cell, wherein the reference cell is at least one selected from among a pathloss reference cell and a timing reference cell, and wherein the first carrier of the first type is part of a carrier aggregation that further includes at least a second carrier of a second, different type.
    Type: Application
    Filed: June 4, 2019
    Publication date: September 19, 2019
    Inventors: Takashi Suzuki, Zhijun Cai, Rene Waraputra Purnadi
  • Patent number: 10412724
    Abstract: A method for designating, by a user agent supporting multiple carriers in a wireless communication network, one assigned carrier as an anchor carrier, at least one assigned carrier as an inactive carrier, and at least one assigned carrier as an active carrier. The method can also include receiving a command from an enhanced node B causing a first carrier to transition from an inactive carrier to an active carrier. Additionally, the method can include responsive to reception of the command, monitoring a control channel corresponding to the first carrier. Further, the method can also include receiving downlink control information (DCI) via the control channel. The method can also include responsive to reception of the DCI, starting a timer, and deactivating the first carrier at the expiration of the timer.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: September 10, 2019
    Assignee: WIRELESS INNOVATIONS LLC
    Inventors: Sean Michael McBeath, Zhijun Cai, Yi Yu
  • Publication number: 20190271582
    Abstract: A method for cargo load detection in a container by a computing device, the method including projecting at least one light dot within an array of light dots towards a surface of the container; capturing an image of the at least one light dot on the surface of the container; and using the captured image to determine cargo loading within the container.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 5, 2019
    Inventors: Jesse William Bennett, Zhijun Cai, Sandeep Chennakeshu, Scott Leonard Dill, Mahendra Fuleshwar Prasad, Yu Gao
  • Patent number: 10405218
    Abstract: In some examples, a wireless access network node communicates with user equipments (UEs) in a plurality of sets of subframes, the plurality of sets of subframes comprising a first set of subframes and a second set of subframes. The wireless access network node performs dynamic power control of a transmission of the wireless access network node in the first set of subframes, and does not perform dynamic power control of a transmission of the wireless access network node in the second set of subframes.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: September 3, 2019
    Assignee: BlackBerry Limited
    Inventors: Yajun Zhu, Hua Xu, Zhijun Cai, Shiwei Gao, Yufei Wu Blankenship, Vahid Pourahmadi
  • Patent number: 10397794
    Abstract: A wireless access network node receives assistance information from a user equipment (UE) or other wireless access network node, the assistance information comprising information indicating one or more channels of an unlicensed spectrum to use or avoid. Responsive to the assistance information, the wireless access network node selects at least a first channel of the unlicensed spectrum for communicating data of the UE.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: August 27, 2019
    Assignee: BlackBerry Limited
    Inventors: Takashi Suzuki, Eswar Vutukuri, Zhijun Cai, Werner Kreuzer
  • Patent number: 10378537
    Abstract: A method for detecting a leak in a pump comprises: monitoring discharge pressure time domain signals of the pump; monitoring piston position time domain signals for each piston of a plurality of pistons; filtering the monitored discharge pressure time domain signals and the monitored piston position time domain signals of each piston of the plurality of pistons via a band pass filter; determining, at each pump revolution for each piston, a sum of product of the filtered discharge pressure time domain signals and the filtered piston position time domain signals; determine, at each pump revolution for each piston, an absolute value of each sum; determining, at each pump revolution, a largest absolute value of the determined absolute values; determining a corresponding piston of the plurality of pistons associated with the largest absolute value; and determining a cylinder of the pump associated with the determined corresponding piston as leaking.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: August 13, 2019
    Assignee: Caterpillar Inc.
    Inventors: Yanchai Zhang, Venkata Bhagavathi Dandibhotla, Zhijun Cai, Zhaoxu Dong, Xuefei Hu
  • Publication number: 20190239162
    Abstract: A system and method are disclosed for providing uplink timing synchronization during DRX operation in a wireless communication system.
    Type: Application
    Filed: April 9, 2019
    Publication date: August 1, 2019
    Inventors: James Earl WOMACK, Yi Yu, Zhijun Cai
  • Patent number: 10349349
    Abstract: Methods of combining semi-persistent resource allocation and dynamic resource allocation are provided. Packets, such as VoIP packets, are transmitted on the uplink and downlink using respective semi-persistent resources. For each mobile device, awake periods and sleep periods are defined. The semi-persistent resources are aligned with the awake periods so that most of the time the mobile device can turn off its wireless access radio during the sleep periods. In addition, signalling to request, and to allocate, resources for additional packets are transmitted during the awake periods, and the resources allocated for the additional packets are within the awake windows.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: July 9, 2019
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, James Earl Womack
  • Patent number: 10341974
    Abstract: Information is communicated indicating whether a cell on a first carrier of a first type is to be used as a reference cell, wherein the reference cell is at least one selected from among a pathloss reference cell and a timing reference cell, and wherein the first carrier of the first type is part of a carrier aggregation that further includes at least a second carrier of a second, different type.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: July 2, 2019
    Assignee: BlackBerry Limited
    Inventors: Takashi Suzuki, Zhijun Cai, Rene Waraputra Purnadi
  • Patent number: 10321436
    Abstract: Methods, devices and systems for a wireless communication system using multiple-serving nodes are provided. In one embodiment, a method of wireless communication comprises sending from a wireless device an uplink control signal to a first node via a second node using a second communication link; receiving by said wireless device a downlink control signal from said first node using a first communication link; sending from said wireless device another uplink control signal to said second node using said second communication link; and receiving by said wireless device another downlink control signal from said second node via said first node using said first communication link.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: June 11, 2019
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Rose Qingyang Hu, Zhijun Cai, James Earl Womack
  • Patent number: 10321511
    Abstract: Systems, methods, and apparatuses for radio resource control (RRC) signaling in wireless communication networks with data offload are provided. The radio configuration messages from a small cell to a dual connection UE may be sent by an overlay macro E-UTRAN node-B (eNB). The small cell may send the RRC messages to the macro-eNB first via a backhaul link, and the macro-eNB then transmits the messages to the UE. In some implementations, the radio configuration messages from a small cell to a dual connection UE may be sent directly from the small cell. In some other implementations, some of the RRC messages may be sent selectively to/from either the macro-cell or the small cell, or to/from both the macro-cell and the small cell. The type of RRC messages sent over the small cell and/or the macro-cell may be preconfigured or predetermined.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: June 11, 2019
    Assignee: BlackBerry Limited
    Inventors: Shiwei Gao, Yufei Wu Blankenship, Zhijun Cai
  • Patent number: 10321359
    Abstract: A first wireless access network node receives feedback information from a second wireless access network node that performs data offload for the first wireless access node, the feedback information identifying a user equipment (UE) and including information relating to a buffer condition of a data buffer in the second wireless access network node. In response to the feedback information, performing, by the first wireless access network node, control of the data offload that includes controlling an offload of at least one radio bearer of the UE identified by the feedback information.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: June 11, 2019
    Assignee: BlackBerry Limited
    Inventors: Shiwei Gao, Yufei Wu Blankenship, Rene Waraputra Purnadi, Zhijun Cai, Yi Song, Changhoi Koo
  • Publication number: 20190174388
    Abstract: Methods of combining semi-persistent resource allocation and dynamic resource allocation are provided. Packets, such as VoIP packets, are transmitted on the uplink and downlink using respective semi-persistent resources. For each mobile device, awake periods and sleep periods are defined. The semi-persistent resources are aligned with the awake periods so that most of the time the mobile device can turn of its wireless access radio during the sleep periods. In addition, signalling to request, and to allocate, resources for additional packets are transmitted during the awake periods, and the resources allocated for the additional packets are within the awake windows.
    Type: Application
    Filed: February 6, 2019
    Publication date: June 6, 2019
    Applicant: BlackBerry Limited
    Inventors: Zhijun Cai, James Earl Womack
  • Patent number: 10313970
    Abstract: Methods and apparatus for controlling discontinuous reception on a mobile device and in particular to control a short discontinuous reception timer in response to receipt of a medium access control control element. The methods and apparatus include stopping, restarting or maintaining the short discontinuous reception timer. Methods and apparatus for limiting or stopping a retransmission timer by providing user equipment with a maximum retry value for transmissions, by providing a maximum redundant version value, or by providing a medium access control control element to stop or prevent the start of a retransmission timer.
    Type: Grant
    Filed: August 13, 2015
    Date of Patent: June 4, 2019
    Assignee: BlackBerry Limited
    Inventors: Zhijun Cai, James Earl Womack, Takashi Suzuki, Gordon Peter Young, Yi Yu
  • Patent number: 10314062
    Abstract: A method, system and device are provided for avoiding in-device coexistence interference between different radio technologies deployed in adjacent bands on the same device by allocating a non-interfering downlink signaling channel for downlink reception of interference avoidance instructions at the UE device. In operation, a user equipment device detects IDC interference and sends an IDC indication message to the radio network to get an appropriate solution, but instead of waiting at the current frequency to receive the IDC response from the radio network, the user equipment device moves to a non-interfering downlink signaling channel for downlink reception of interference avoidance instructions.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: June 4, 2019
    Assignee: BlackBerry Limited
    Inventors: Changhoi Koo, Zhijun Cai, Youn Hyoung Heo
  • Patent number: 10308157
    Abstract: A machine having a work implement includes a sensor connected to the work implement, the sensor providing a signal indicative of a change in acceleration of the work implement. A cycle controller associated with the sensor, the cycle controller disposed to receive the signal and operating to monitor the signal. The cycle controller is programmed and operates to analyze the signal to determine at least a presence and a duration of a change in acceleration of the work implement of the machine with respect to time, compile an actual time trace of the change in acceleration of the work implement, compare the actual time trace with a predefined time trace that represents a work cycle segment, and catalog presence and duration of a work cycle segment when the actual time trace is consistent with the predefined time trace.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: June 4, 2019
    Assignee: Caterpillar Inc.
    Inventors: Zhijun Cai, Bradley Bomer, Shane C. McBride, Eric Durand, Anders Thomsen
  • Patent number: 10302478
    Abstract: A method for cargo load detection in a container by a computing device, the method including projecting at least one light dot within an array of light dots towards a surface of the container; capturing an image of the at least one light dot on the surface of the container; and using the captured image to determine cargo loading within the container.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: May 28, 2019
    Assignee: BlackBerry Limited
    Inventors: Jesse William Bennett, Zhijun Cai, Sandeep Chennakeshu, Scott Leonard Dill, Mahendra Fuleshwar Prasad, Yu Gao