Patents by Inventor Yujian Zhang

Yujian Zhang 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).

  • Methods to Handle Scheduling Requests for Ultra-Reliable Low Latency Communication (URLLC) in New Radio (NR) Systems
    Publication number: 20200359457
    Abstract: Embodiments of a User Equipment (UE) and methods of communication are generally described herein. The UE may, if a regular buffer status report (BSR) is triggered and a logical channel scheduling request (SR) delay timer is not running, and if available uplink shared channel (UL-SCH) data resources do not meet one or more logical channel prioritization (LCP) mapping restrictions configured for a logical channel of uplink data: trigger a scheduling request to request UL-SCH data resources for a new transmission of uplink data. Currently pending SRs and BSRs may not be cancelled after assembly of a medium access control (MAC) protocol data unit (PDU), but may be cancelled at a later time when a MAC PDU including a BSR is transmitted.
    Type: Application
    Filed: July 24, 2020
    Publication date: November 12, 2020
    Inventors: Bharat Shrestha, Yujian Zhang
  • Device Requested Protocol Data Unit Session Modification in the 5G System
    Publication number: 20200351702
    Abstract: Systems and methods of segregating a SDF of a PDU session are described. The UE transmits a NAS message to the network. The NAS message indicates the SDF, the desired QoS, and a segregation indication that requests that the network establish a separate QoS flow for the SDF even if an existing QoS flow is able to support the specific QoS. The SF decides whether or not to establish the separate QoS flow and updates filters in the UPF as well as providing a response to the UE containing a similar indication. The UE modifies resources related to the PDU session based on the response. The QoS is indicated as a 5QI and GBR or as a QFI of an existing QoS Flow on which the SDF is to be added if the separate QoS is not established. The QFI is in an unencrypted SDAP header of the NAS message.
    Type: Application
    Filed: July 18, 2020
    Publication date: November 5, 2020
    Inventors: Alexandre Saso Stojanovski, Jerome Parron, Sudeep K. Palat, Yujian Zhang
  • DISCONTINUOUS RECEPTION (DRX) ENHANCEMENTS IN LTE SYSTEMS
    Publication number: 20200314679
    Abstract: Embodiments of a system and method for providing DRX enhancements in LTE systems are generally described herein. In some embodiments, a system control module is provided for controlling communications via a communications interface. A processor is coupled to the system control module and is arranged to implement an inactivity timer and an on-duration timer for determining an active time for monitoring subframes on the physical downlink control channel for control signals, the processor further monitoring subframes after the active time.
    Type: Application
    Filed: March 5, 2020
    Publication date: October 1, 2020
    Inventors: Youn Hyoung Heo, Yujian Zhang, Jong-Kae Fwu
  • USER EQUIPMENT (UE), EVOLVED NODE-B (ENB) AND METHODS FOR A PACKET CONVERGENCE AND LINK CONTROL (PCLC) LAYER
    Publication number: 20200305225
    Abstract: Embodiments of a User Equipment (UE), Evolved Node-B (eNB) and methods for communication in accordance with a packet convergence and link control (PCLC) layer are generally described herein. The UE may receive, from a Fifth Generation (5G) eNB, a first group of medium access control (MAC) protocol data units (PDUs) that include PCLC PDUs. In accordance with PCLC sequence numbers (SNs), the UE may reorder the PCLC PDUs and may decipher the PCLC PDUs. The UE may receive, from a legacy eNB, a second group of MAC PDUs that include packet data convergence protocol (PDCP) PDUs encapsulated in radio link control (RLC) PDUs. The UE may reorder the RLC PDUs based on RLC SNs and may decipher the RLC PDUs based on PDCP SNs that are exclusive to the RLC SNs.
    Type: Application
    Filed: September 16, 2016
    Publication date: September 24, 2020
    Inventors: Yujian Zhang, Mo-Han Fong, Youn Hyoung Heo, Richard C. Burbidge, Umesh Phuyal, Candy Yiu, Hong He, Sudeep K. Palat
  • User equipment and methods of bearer operation for carrier aggregation
    Patent number: 10779297
    Abstract: Embodiments of a User Equipment (UE) to support dual-connectivity with a Master Evolved Node-B (MeNB) and a Secondary eNB (SeNB) are disclosed herein. The UE may receive downlink traffic packets from the MeNB and from the SeNB as part of a split data radio bearer (DRB). At least a portion of control functionality for the split DRB may be performed at each of the MeNB and the SeNB. The UE may receive an uplink eNB indicator for an uplink eNB to which the UE is to transmit uplink traffic packets as part of the split DRB. Based at least partly on the uplink eNB indicator, the UE may transmit uplink traffic packets to the uplink eNB as part of the split DRB. The uplink eNB may be selected from a group that includes the MeNB and the SeNB.
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: September 15, 2020
    Assignee: Apple Inc.
    Inventors: Yujian Zhang, Youn Hyoung Heo
  • COMMUNICATION NETWORK APPARATUS FOR UPLINK SCHEDULING
    Publication number: 20200288494
    Abstract: An apparatus to be used in a UE in a mobile communication network to communicate with a base station, includes a memory configured to store a RRC message, and processing circuitry configured to decode the RRC message to obtain BWP configuration information and mapping information, identify one or more UL BWPs and one or more DL BWPs within a carrier bandwidth per Serving Cell based on the BWP configuration information, identify one or more SR configurations which a LCH is mapped to for the UL BWPs based on the mapping information, the LCH being mapped to none or one SR configuration for each of the UL BWPs, identify activation of a UL BWP of the UL BWPs, and encode an SR on a PUCCH based on a SR configuration for the UL BWP.
    Type: Application
    Filed: September 28, 2018
    Publication date: September 10, 2020
    Inventors: Youn Hyoung HEO, Bharat SHRESTHA, Yujian ZHANG
  • Methods to handle scheduling requests for ultra-reliable low latency communication (URLLC) in new radio (NR) systems
    Patent number: 10764962
    Abstract: Embodiments of a User Equipment (UE) and methods of communication are generally described herein. The UE may, if a regular buffer status report (BSR) is triggered and a logical channel scheduling request (SR) delay timer is not running, and if available uplink shared channel (UL-SCH) data resources do not meet one or more logical channel prioritization (LCP) mapping restrictions configured for a logical channel of uplink data: trigger a scheduling request to request UL-SCH data resources for a new transmission of uplink data. Currently pending SRs and BSRs may not be cancelled after assembly of a medium access control (MAC) protocol data unit (PDU), but may be cancelled at a later time when a MAC PDU including a BSR is transmitted.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: September 1, 2020
    Assignee: Apple inc.
    Inventors: Bharat Shrestha, Yujian Zhang
  • Device requested protocol data unit session modification in the 5G system
    Patent number: 10721648
    Abstract: Systems and methods of segregating a SDF of a PDU session are described. The UE transmits a NAS message to the network. The NAS message indicates the SDF, the desired QoS, and a segregation indication that requests that the network establish a separate QoS flow for the SDF even if an existing QoS flow is able to support the specific QoS. The SMF decides whether or not to establish the separate QoS flow and updates filters in the UPF as well as providing a response to the UE containing a similar indication. The UE modifies resources related to the PDU session based on the response. The QoS is indicated as a 5QI and GBR or as a QFI of an existing QoS Flow on which the SDF is to be added if the separate QoS is not established. The QFI is in an unencrypted SDAP header of the NAS message.
    Type: Grant
    Filed: October 12, 2018
    Date of Patent: July 21, 2020
    Assignee: Apple Inc.
    Inventors: Alexandre Saso Stojanovski, Jerome Parron, Sudeep K. Palat, Yujian Zhang
  • PRIORITIZATION OF SERVICES FOR CONTROL AND DATA TRANSMISSION FOR NEW RADIO SYSTEMS
    Publication number: 20200228248
    Abstract: Methods, systems, and storage media are described for the prioritization of services for control and data transmission for new radio (NR) systems. In particular, some embodiments may be directed to the prioritization of hybrid automatic repeat request-acknowledgment (HARQ-ACK) transmissions. Other embodiments may be described and/or claimed.
    Type: Application
    Filed: March 27, 2020
    Publication date: July 16, 2020
    Inventors: Toufiqul Islam, Debdeep Chatterjee, Sergey Panteleev, Fatemeh Hamidi-Sepehr, Gang Xiong, Yujian Zhang
  • Low overhead system information acquisition for wireless communication
    Patent number: 10708853
    Abstract: A method for low overhead system information acquisition (LOSIA) is disclosed. The LOSIA method includes several techniques for transmitting common channels in a next generation Radio Access Technology (xRAT). Instead of transmitting system information in a periodic, static, cell-specific, wideband manner, the transmission is triggered by user equipment in an “on demand” manner. The LOSIA method allows the network to control the overhead, bandwidth, and periodicity, as well as other characteristics. The LOSIA method employs several different techniques to trigger the information upon which the network can act, for example, by transmitting different payloads depending on the received trigger.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: July 7, 2020
    Assignee: Apple Inc.
    Inventors: Ralf Bendlin, Gang Xiong, Jong-Kae Fwu, Yujian Zhang
  • L2 HANDLING FOR BEARER TYPE CHANGE
    Publication number: 20200196374
    Abstract: An apparatus of an evolved Node B or a Fifth Generation Node B comprises one or more baseband processors to generate an RRCConnectionReconfiguration message to include an information element (IE) to configure a user equipment (UE) to receive data from a Long-Term Evolution node and from a New Radio node in a unified split bearer configuration and encode data to be transmitted to the UE via a master cell group bearer, a secondary cell group bearer, or a unified split bearer. The baseband processors further are to encode an IE of an RRCReconfiguration message to configure a data radio bearer as a Packet Data Convergence Protocol and higher layers configuration coupled with one or more logical channels of radio link control and below, and to configure a change between a single connectivity bearer to multi-connectivity bearer by configuring or releasing one or more of the logical channels.
    Type: Application
    Filed: June 14, 2018
    Publication date: June 18, 2020
    Applicant: Intel Corporation
    Inventors: Seau S. Lim, Sudeep K. Palat, Yujian Zhang, Youn Hyoung Heo, Richard Burbidge
  • MEASUREMENT GAP REPETITION PATTERNS FOR INTER-FREQUENCY OFFLOADING IN HETEROGENEOUS WIRELESS NETWORKS
    Publication number: 20200145862
    Abstract: An embodiment for user equipment that receives a plurality of measurement gap repetition patterns from a network. Each measurement gap repetition pattern may be assigned to a different frequency of the network. The plurality of measurement gap repetition patterns may include skipping measurement patterns. Further embodiments may include the user equipment receiving a repetition period in a measurement object frame or receiving a plurality of measurement gap repetition patterns in which the measurement gaps are non-colliding with measurement gaps of other repetition patterns assigned to the user equipment.
    Type: Application
    Filed: October 8, 2019
    Publication date: May 7, 2020
    Inventors: Candy Yiu, Yang Tang, Yujian Zhang, Rui Huang
  • Security Key Refresh for Dual Connectivity
    Publication number: 20200136684
    Abstract: Embodiments have a master eNB with a control plane and optional data plane to user equipment and a secondary eNB with a data plane to the user equipment. The user equipment thus uses both the master eNB and the secondary eNB for data communications while receiving control information from only the master eNB. The master eNB and secondary eNB are connected with an X2 interface. When the secondary eNB desires to refresh its security key, it informs the master eNB using the X2 interface. The master eNB then uses its control plane with the user equipment to initiate a security key refresh for the secondary eNB.
    Type: Application
    Filed: December 26, 2019
    Publication date: April 30, 2020
    Inventors: Yujian Zhang, Youn Hyoung Heo, Achim Luft
  • SEAMLESS MOBILITY FOR 5G AND LTE SYSTEMS AND DEVICES
    Publication number: 20200128464
    Abstract: User equipment (UE), an enhanced NodeB (eNB) and method of reducing handover latency are generally described. The UE may transmit measurement feedback to the eNB based on control signals. The UE may receive a reconfiguration message from the eNB or another eNB to the UE is attached. The reconfiguration message may contain reconfiguration information indicating whether or not a physical layer or layer 2 of the UE is to be reconfigured and/or a security key is to be updated. The reconfiguration information may be dependent on whether the handover is between eNBs controlled by a same entity and/or whether the handover comprises an intra-frequency transition. The UE or eNB may initiate handover of the UE. During handover the UE may avoid physical layer or layer 2 reconfiguration or the security key update. The security key and data for the UE may be provided directly between the eNBs.
    Type: Application
    Filed: September 26, 2019
    Publication date: April 23, 2020
    Inventors: Yujian Zhang, Mo-Han Fong, Pingping Zong, Alexei Davydov
  • Discontinuous reception (DRX) enhancements in LTE systems
    Patent number: 10631190
    Abstract: Embodiments of a system and method for providing DRX enhancements in LTE systems are generally described herein. In some embodiments, a system control module is provided for controlling communications via a communications interface. A processor is coupled to the system control module and is arranged to implement an inactivity timer and an on-duration timer for determining an active time for monitoring subframes on the physical downlink control channel for control signals, the processor further monitoring subframes after the active time.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: April 21, 2020
    Assignee: Apple Inc.
    Inventors: Youn Hyoung Heo, Yujian Zhang, Jong-Kae Fwu
  • POWER HEADROOM REPORTING WITH DUAL CONNECTIVITY
    Publication number: 20200107278
    Abstract: Embodiments described herein relate generally to a communication between a user equipment (“UE”) and a plurality of evolved Node Bs (“eNBs”). A UE may be adapted to operate in a dual connected mode on respective wireless cells provided by first and second eNBs. The UE may be adapted to estimate respective power headroom (“PHR”) values associated with simultaneous operation on the first and second wireless cells. The UE may cause the first and second PHR estimates to be transmitted to both the first and second eNBs. The first and second eNBs may use these estimates to compute respective uplink transmission powers for the UE. Other embodiments may be described and/or claimed.
    Type: Application
    Filed: October 17, 2018
    Publication date: April 2, 2020
    Inventors: KATHIRAVETPILLAI SIVANESAN, ALI T. KOC, SATISH C. JHA, RATH VANNITHAMBY, YUJIAN ZHANG
  • One measurement gap in asynchronous dual connectivity
    Patent number: 10602511
    Abstract: In an embodiment, an apparatus to be employed in a user equipment (UE) is described. The apparatus includes configuration circuitry operable to determine, based on one or more configuration information messages, a measurement gap for a master evolved Node B (MeNB) that is operable to provide a master cell group (MCG) that is asynchronous with a secondary cell group (SCG) of a secondary evolved Node B (SeNB), wherein subframe boundaries of the MCG are different from subframe boundaries of the SCG; and radio frequency (RF) control circuitry operable to cause RF circuitry to be tuned, at a beginning of the measurement gap based on a subframe boundary of the MCG, to start inter-frequency measurements, wherein the RF circuitry is to be used to transmit or receive data in a serving cell of the MCG and in a serving cell of the SCG. Other embodiments are also described and claimed.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: March 24, 2020
    Assignee: Intel IP Corporation
    Inventors: Rui Huang, Yang Tang, Candy Yiu, Yujian Zhang
  • Activation of secondary cell containing bandwidth parts
    Patent number: 10602506
    Abstract: 5G methods and architectures to determine active SCells and their bandwidth parts (BWP) used in carrier aggregation (CA) are disclosed in which activating a BWP for an active SCell is performed initially according to a default value provided in initial radio resource control (RRC) messaging. After initialization, SCells and the SCell BWPs used by the user equipment (UE) are activated by RRC messaging, downlink control information (DCI) or dedicated medium access control (MAC) control elements (MAC CEs) with the initial BWP used for an activated SCell being a default value provided during initialization.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: March 24, 2020
    Assignee: Apple Inc.
    Inventors: Yujian Zhang, Jeongho Jeon, Youn Hyoung Heo, Candy Yiu, Bharat Shrestha
  • RE-TRANSMISSION OF PDCP PDUS BY CENTRALIZED NODES OF A RAN ARCHITECTURE
    Publication number: 20200029390
    Abstract: A centralized RAN architecture that includes lower layer transmission nodes (referred to as distributed units (DUs) herein) that connect to an upper layer RAN node (referred to as a centralized unit (CU) herein). A centralized RAN architecture may include a functional split, between the CU and DU, corresponding to the Packet Data Convergence Protocol (PDCP) and Radio Link Control (RLC) layers. In one embodiment, a CU may store copies of downlink PDCP PDUs that are transmitted to a first DU. The CU may retransmit, to a second DU, those of the PDCP PDUs which were previously transmitted to the source DU but have not been acknowledged as successfully delivered by the source DU.
    Type: Application
    Filed: March 16, 2018
    Publication date: January 23, 2020
    Inventors: Jaemin Han, Yujian Zhang, Alexander Sirotkin, Xu Zhang, Yifan Yu, Min Huang, Feng Yang, Sudeep Palat
  • ENHANCED NODE B, USER EQUIPMENT AND METHODS FOR DISCONTINUOUS RECEPTION IN INTER-ENB CARRIER AGGREGATION
    Publication number: 20200022210
    Abstract: Embodiments of user equipment (UE) and methods for enhanced discontinuous reception (DRX) operations for inter eNB carrier aggregation (CA) in an LTE network are generally described herein. In some embodiments, a UE is configured to be served by multiple serving cells. The first set of the serving cells may be associated with a first eNB and a second set of serving cells may be associated with a second eNB. In these embodiments, DRX operations may be performed independently in multiple serving cells belonging to the different eNBs. Other embodiments for enhanced DRX operations are also described.
    Type: Application
    Filed: July 23, 2019
    Publication date: January 16, 2020
    Inventors: Youn Hyoung Heo, Yujian Zhang