Patents by Inventor Zhu Ji

Zhu Ji 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: 9167519
    Abstract: Methods and apparatus for adaptively adjusting temporal parameters (e.g., neighbor cell search durations). In one embodiment, neighbor cell search durations during discontinuous reception are based on a physical channel metric indicating signal strength and quality (e.g. Reference Signal Received Power (RSRP), Received Signal Strength Indication (RSSI), Reference Signal Receive Quality (RSRQ), etc.) of a cell. In a second embodiment, neighbor cell search durations are based on a multitude of physical layer metrics from one or more cells. In one variant, the multitude of physical layer metrics may include signal strength and quality metrics from the serving base station as well as signal strength and quality indicators from neighbor cells derived from the cells respective synchronization sequences.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: October 20, 2015
    Assignee: Apple Inc.
    Inventors: Navid Damji, Zhu Ji, Johnson Sebeni, Jason Shi, Li Su
  • Patent number: 9157133
    Abstract: The present invention provides a hydrothermal oxidation method for producing alkali metal dichromate from carbon ferrochrome, and the method comprises the following steps: formulating an initial reaction liquid by mixing carbon ferrochrome, an alkaline substance and water, in which the actual addition amount of the alkali is controlled smaller than the theoretically required amount; adding the initial reaction liquid into a reaction kettle, charging an oxidizing gas into the reaction kettle, and allowing the reaction to proceed for 0.5 to 3 h at a temperature of 150° C. to 370° C. and a pressure of 2 Mpa to 24 MPa; carrying out solid-liquid separation, cooling the resultant filtrate to a temperature of ?12° C. to ?20° C.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: October 13, 2015
    Assignee: TIANJIN PASSION SCIENCE AND TECHNOLOGY CO., LTD.
    Inventors: Zhu Ji, Jinsong Wang, Zhong Zhang, Yuqing Yang, Aishan Wang, Weiguo Song, Xinjian Yin, Qingting Wei, Hongwei Ru, Wenwen Zhang, Haijun Mei
  • Publication number: 20150271697
    Abstract: Methods and apparatus for managing radio measurements during discontinuous reception. In one exemplary embodiment, the distribution of Long Term Evolution (LTE) DRX measurements is staggered or distributed across multiple DRX cycles (which may be contiguous or non-contiguous) so as to reduce the transceiver activity and power consumption. The exemplary UE in one implementation only performs a subset of measurements during each DRX cycle. By staggering or distributing cell measurements over multiple DRX cycles, the UE can improve power consumption, while still conforming to measurement requirements.
    Type: Application
    Filed: June 8, 2015
    Publication date: September 24, 2015
    Inventors: Zhu Ji, Jason Shi, Johnson Sebeni, Navid Damji, Li Su
  • Publication number: 20150263830
    Abstract: A wireless communication system is presented for adaptive uplink (UL) link adaptation (LA). The adaptive UL LA can include multiple outer loops, for which multiple block error rate (BLER) filtering is performed. Each of the multiple BLER filtering can be performed on groups or sub-groups of subframes, in which each group has the same or similar coding characteristics. For example, one group in TD-LTE could be subframes with sounding reference signal (SRS) and another group could be subframes without SRS. Each of the multiple BLER filtering can use the same or different BLER algorithm, BLER target and/or BLER parameters.
    Type: Application
    Filed: September 30, 2014
    Publication date: September 17, 2015
    Inventors: Si Li, Zhu Ji, Srinivasan Vasudevan
  • Patent number: 9100162
    Abstract: Adaptive generation of channel state feedback (CSF) based on base station CSF scheduling. CSF report scheduling information may be received. CSF metrics may be generated based at least in part on the CSF report scheduling information. A CSF report including the CSF metrics may be transmitted to the base station. Periodicity of CSF report scheduling or other CSF report scheduling factors may be taken into consideration in generation of the CSF metrics.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: August 4, 2015
    Assignee: Apple Inc.
    Inventors: Zhu Ji, Navid Damji, Johnson O. Sebeni
  • Patent number: 9084183
    Abstract: A method for performing a frequency scan in presence of an adjacent jammer signal is provided. The method can include a wireless communication device determining an occurrence of an acquisition (ACQ) failure on a candidate system in a frequency scan candidate list (FSCL) generated based on a first frequency scan; identifying the candidate system as a jammer signal in response to the ACQ failure; suppressing the jammer signal to derive a jammer suppressed signal; and performing a second frequency scan based at least in part on the jammer suppressed signal.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: July 14, 2015
    Assignee: Apple Inc.
    Inventors: Zhu Ji, Johnson O. Sebeni
  • Patent number: 9066261
    Abstract: Methods and apparatus for managing radio measurements during discontinuous reception. In one exemplary embodiment, the distribution of Long Term Evolution (LTE) DRX measurements is staggered or distributed across multiple DRX cycles (which may be contiguous or non-contiguous) so as to reduce the transceiver activity and power consumption. The exemplary UE in one implementation only performs a subset of measurements during each DRX cycle. By staggering or distributing cell measurements over multiple DRX cycles, the UE can improve power consumption, while still conforming to measurement requirements.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: June 23, 2015
    Assignee: Apple Inc.
    Inventors: Zhu Ji, Jason Shi, Johnson Sebeni, Navid Damji, Li Su
  • Publication number: 20150173006
    Abstract: A method for performing a frequency scan in presence of an adjacent jammer signal is provided. The method can include a wireless communication device determining an occurrence of an acquisition (ACQ) failure on a candidate system in a frequency scan candidate list (FSCL) generated based on a first frequency scan; identifying the candidate system as a jammer signal in response to the ACQ failure; suppressing the jammer signal to derive a jammer suppressed signal; and performing a second frequency scan based at least in part on the jammer suppressed signal.
    Type: Application
    Filed: February 23, 2015
    Publication date: June 18, 2015
    Inventors: Zhu Ji, Johnson O. Sebeni
  • Patent number: 9019880
    Abstract: Certain aspects of the disclosure relate generally to uplink flow control of wireless devices for mitigation of overload issues. A user equipment (UE) may reduce an average transmit power for the uplink channel based on whether an overload metric (e.g., temperature metric) exceeds a threshold value. The UE may perform duty cycling for an uplink control channel when an overactive uplink control channel is a dominating factor in a thermal issue. The UE may further reduce a maximum power transmit limit (MTPL) for one or more uplink channels, such as physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH).
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: April 28, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Navid Ehsan, Thomas Klingenbrunn, Jon James Anderson, Deepak Krishnamoorthi, Gang Andy Xiao, Pradeep Sagane Gowda, Vijay Balasubramanian, Zhu Ji
  • Patent number: 9001690
    Abstract: Adaptive generation of channel quality indicators based on a current communication scenario. A plurality of sets of channel quality indicator information may be stored for each of a plurality of UE communication scenarios. The information may be usable in generating a channel quality indicator. During operation of the UE, a current communication scenario of the UE may be determined. A first set of channel quality indicator information may be selected based on the determined current communication scenario being experienced by the UE. At least one channel quality indicator may be determined based on the selected first set of channel quality indicator information. Finally, the channel quality indicator may be provided to a base station.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: April 7, 2015
    Assignee: Apple Inc.
    Inventors: Zhu Ji, Navid Damji, Johnson O. Sebeni
  • Patent number: 8989035
    Abstract: A methodology for determining a periodicity of a neighbor cell search for a cellular mobile device is disclosed. The neighbor cell searches may be conducted during discontinuous reception (DRX) paging cycles. However, instead of performing a neighbor cell search during each DRX paging cycle, the period for performing a neighbor cell search may be adaptively determined. Various metrics may be used in determining the periodicity for neighbor cell searches. In various embodiments, two or more metrics may be utilized in combination to determine the neighbor cell search periodicity.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: March 24, 2015
    Assignee: Apple Inc.
    Inventors: Navid Damji, Longda Xing, Zhu Ji, Johnson O. Sebeni, Jianxiong Shi, Sree Ram Kodali
  • Patent number: 8965365
    Abstract: A method for performing a frequency scan in presence of an adjacent jammer signal is provided. The method can include a wireless communication device determining an occurrence of an acquisition (ACQ) failure on a candidate system in a frequency scan candidate list (FSCL) generated based on a first frequency scan; identifying the candidate system as a jammer signal in response to the ACQ failure; suppressing the jammer signal to derive a jammer suppressed signal; and performing a second frequency scan based at least in part on the jammer suppressed signal.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: February 24, 2015
    Inventors: Zhu Ji, Johnson O. Sebeni
  • Publication number: 20140376437
    Abstract: Providing adaptive channel state feedback (CSF) reports in discontinuous reception (DRX) scenarios in a power-efficient manner. The described algorithm may be able to make adaptive decisions to carry over the CSF from previous DRX cycles based on channel conditions, DRX cycle length, and/or the requirements of CSF reporting for current DRX cycle. The proposed approach can allow for more efficient power consumption related to CSF reports in DRX scenarios where new CSF reports have little or no impact to throughput.
    Type: Application
    Filed: September 12, 2014
    Publication date: December 25, 2014
    Inventors: Zhu Ji, Navid Damji, Johnson O. Sebeni
  • Patent number: 8909282
    Abstract: This disclosure provides systems, methods and apparatus for providing transmission power limit back-off for Specific Absorption Rate (SAR) compliance. In one aspect, a method implemented in a wireless communication apparatus is provided. The method includes receiving an indication of at least one operating mode indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus. The method further includes selecting from a plurality of transformations associated with the at least one operating mode. The method further includes applying a selected transformation to adjust a relationship between a power transmission level of a first transmitter and a power transmission level of a second transmitter. The method further includes determining a target power transmission level of the first transmitter based on the adjusted relationship and a current power transmission level of the second transmitter.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: December 9, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Francis Ming-Meng Ngai, John A. Forrester, Anshul Pandey, Supratik Bhattacharjee, Rema Vaidyanathan, Brian Michael George, Zhu Ji
  • Publication number: 20140341791
    Abstract: The present invention provides a hydrothermal oxidation method for producing alkali metal dichromate from carbon ferrochrome, and the method comprises the following steps: formulating an initial reaction liquid by mixing carbon ferrochrome, an alkaline substance and water, in which the actual addition amount of the alkali is controlled smaller than the theoretically required amount; adding the initial reaction liquid into a reaction kettle, charging an oxidizing gas into the reaction kettle, and allowing the reaction to proceed for 0.5 to 3 h at a temperature of 150° C. to 370° C. and a pressure of 2 Mpa to 24 MPa; carrying out solid-liquid separation, cooling the resultant filtrate to a temperature of ?12° C. to ?20° C.
    Type: Application
    Filed: November 2, 2010
    Publication date: November 20, 2014
    Applicant: TIANJIN PASSION SCIENCE AND TECHNOLOGY CO., LTD.
    Inventors: Zhu Ji, Jinsong Wang, Zhong Zhang, Yuqing Yang, Aishan Wang, Weiguo Song, Xinjian Yin, Qingting Wei, Hongwei Ru, Wenwen Zhang, Haijun Mei
  • Patent number: 8879475
    Abstract: Providing adaptive channel state feedback (CSF) reports in discontinuous reception (DRX) scenarios in a power-efficient manner. The described algorithm may be able to make adaptive decisions to carry over the CSF from previous DRX cycles based on channel conditions, DRX cycle length, and/or the requirements of CSF reporting for current DRX cycle. The proposed approach can allow for more efficient power consumption related to CSF reports in DRX scenarios where new CSF reports have little or no impact to throughput.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: November 4, 2014
    Assignee: Apple Inc.
    Inventors: Zhu Ji, Navid Damji, Johnson O. Sebeni
  • Patent number: 8867448
    Abstract: Providing adaptive channel state feedback (CSF) reports in discontinuous reception (DRX) scenarios in a power-efficient manner. The described algorithm may be able to make adaptive decisions to carry over the CSF from previous DRX cycles based on channel conditions, DRX cycle length, and/or the requirements of CSF reporting for current DRX cycle. The proposed approach can allow for more efficient power consumption related to CSF reports in DRX scenarios where new CSF reports have little or no impact to throughput.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: October 21, 2014
    Assignee: Apple Inc.
    Inventors: Zhu Ji, Navid Damji, Johnson O. Sebeni
  • Publication number: 20140307645
    Abstract: A wireless communication system is presented in which subframe-specific link adaptation is performed. A mobile device can transmit a signal that informs a base station whether a particular subframe was received successfully. Additionally the mobile device can calculate channel state information (CSI) for a subframe and report the CSI to a base station. The reported CSI may or may not include an indicator for informing the base station about from which type of subframe the CSI was derived. The base station can receive the signal, the CSI and/or the indicator. Based on what information the base station has received, it performs subframe-specific BLER filtering and subframe-specific link adaptation scheduling and MCS adjustments.
    Type: Application
    Filed: January 16, 2014
    Publication date: October 16, 2014
    Applicant: Apple Inc.
    Inventors: Zhu Ji, Johnson O. Sebeni, Navid Damji
  • Publication number: 20140269373
    Abstract: A method for adaptively disabling receiver diversity is provided. The method can include a wireless communication device determining an active data traffic pattern; defining a threshold channel quality metric based at least in part on a threshold channel quality needed to support a threshold quality of service for the active data traffic pattern; comparing a measured channel quality to the threshold channel quality metric; and disabling receiver diversity in an instance in which the measured channel quality metric satisfies the threshold channel quality metric.
    Type: Application
    Filed: May 22, 2013
    Publication date: September 18, 2014
    Inventors: Srinivasan Nimmala, Navid Damji, Tarik Tabet, Li Su, Longda Xing, Zhu Ji
  • Patent number: 8824411
    Abstract: Various method and apparatus embodiments for adjusting control loop parameters for wireless communication link are disclosed. The adjustments may be performed responsive to a single radio UE tuning away from a first network to a second network, or due to a fading condition. Responsive to detecting the tuning away of the UE or the fading condition, the base station may adjust one or more parameters of a control loop. The adjustments may include changing parameters of one or more filters in the BS. For example, a block error rate (BLER) first state can be reset to a small value, or can be incrementally adjusted responsive to detecting discrete transmissions (DTX) or other signals from the UE. In another example, BLER filter coefficients may be updated responsive to DTX detections.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: September 2, 2014
    Assignee: Apple Inc.
    Inventors: Johnson O. Sebeni, Zhu Ji, Navid Damji