Patents by Inventor Yufei Wu

Yufei Wu 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: 9467872
    Abstract: A method and network node for managing a relay node that is moving relative to a source network node are provided. The method and the network node ensure a target network node is capable of supporting the relay node and if the target network node is capable of supporting the relay node, the method and network node sends a handover request from the source network node to the target network a handover request from the source network node to the target network node, and establishes an interface between the relay node and the target network node.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: October 11, 2016
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, Yi Song, Yufei Wu Blankenship, Chandra Sekhar Bontu
  • Publication number: 20160295577
    Abstract: Uplink control channel resource allocation for an enhanced downlink control channel is disclosed. A first example method disclosed herein includes receiving, at a user equipment (UE), a downlink control channel carrying a physical uplink control channel (PUCCH) resource indicator, mapping the PUCCH resource indicator to a first offset, mapping a position of the downlink control channel to a second offset, and mapping a linear combination of the first and second offsets to an index identifying a first PUCCH resource. A second example method disclosed herein includes, in response to receiving, at a UE, an indication of a dynamic resource offset in an enhanced physical downlink control channel (ePDCCH) transmitted in a first ePDCCH set, determining a position of the ePDCCH and a subframe offset, and processing the indication of the dynamic resource offset, the position and the subframe offset to determine an allocated uplink control channel resource for the UE.
    Type: Application
    Filed: June 7, 2016
    Publication date: October 6, 2016
    Applicant: BlackBerry Limited
    Inventors: Robert Mark HARRISON, Shiwei Gao, Yufei Wu BLANKENSHIP
  • Publication number: 20160286423
    Abstract: A wireless access network node receives, from a coordinating network node, configuration information relating to a configuration of an uplink signal comprising a given uplink sequence selected by a user equipment (UE) from a plurality of uplink sequences and to be transmitted by the UE, the configuration information to enable the wireless access network node to monitor for the uplink signal, the plurality of uplink sequences mapped to respective power levels. The wireless access network node monitors for the uplink signal according to the configuration while the wireless access network node is in an off state, and determines a power level of the uplink signal based on the given uplink sequence in the uplink signal detected by the wireless access network node.
    Type: Application
    Filed: June 6, 2016
    Publication date: September 29, 2016
    Inventors: Yajun Zhu, Hua Xu, Zhijun Cai, Shiwei Gao, Yufei Wu Blankenship, Vahid Pourahmadi
  • Patent number: 9444745
    Abstract: A first wireless access network node sets a data rate for communication of data between a second wireless access network node and a user equipment (UE) that is concurrently connected to the first wireless access network node and the second wireless access network node. The first wireless access network node sends information relating to the data rate to the second wireless access network node for use by the second wireless access network node in controlling data communication between the second wireless access network node and the UE.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: September 13, 2016
    Assignee: BlackBerry Limited
    Inventors: Yufei Wu Blankenship, Shiwei Gao, Zhijun Cai, Yi Song
  • Patent number: 9445397
    Abstract: A method at a first device for enabling a device-to-device wireless link, the method detecting whether a presence signal of a second device is received over a first time period, the presence signal of the second device having a time-slot boundary; and if the presence signal of the second device is not detected, initiating a time-slot boundary by the first device including: transmitting a first presence signal of the first device in a selected time-slot; and checking for an acknowledgment to the first presence signal.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: September 13, 2016
    Assignee: BlackBerry Limited
    Inventors: Yufei Wu Blankenship, Sagar Dhakal, Nam Nguyen
  • Patent number: 9391759
    Abstract: A wireless access network node receives a configuration for a discovery signal for transmission by the wireless access network when in an off state. The wireless access network node in the off state transmits the discovery signal according to the configuration for detection by a user equipment (UE).
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: July 12, 2016
    Assignee: BlackBerry Limited
    Inventors: Yajun Zhu, Hua Xu, Zhijun Cai, Shiwei Gao, Yufei Wu Blankenship, Vahid Pourahmadi
  • Publication number: 20160197748
    Abstract: A blind spectrum sensing method and device based on fast Fourier transform. The method comprises: the spectrum sensing device receives a signal on an authorized spectrum band, calculates an autocorrelation coefficient of the received signal after sampling and filtering same, then performs a fast Fourier transform of the autocorrelation coefficient, acquires the modulus of the transform result, constructs determination variables on the basis of the modulus, and determine whether or not a signal of an authorized user is present. The method and device have the advantages of low calculation complexity, obviated need for authorization information characteristic, and insensitivity towards noise uncertainty, and are of great performance.
    Type: Application
    Filed: June 20, 2013
    Publication date: July 7, 2016
    Inventors: Dongming Wang, Yufei Wu, Ruixun Liu, Xiangyang Wang, Wenrui Tang, Yuqi Huang
  • Patent number: 9380568
    Abstract: Uplink control channel resource allocation for an enhanced downlink control channel is disclosed. A first example method disclosed herein includes receiving, at a user equipment (UE), a downlink control channel carrying a physical uplink control channel (PUCCH) resource indicator, mapping the PUCCH resource indicator to a first offset, mapping a position of the downlink control channel to a second offset, and mapping a linear combination of the first and second offsets to an index identifying a first PUCCH resource. A second example method disclosed herein includes, in response to receiving, at a UE, an indication of a dynamic resource offset in an enhanced physical downlink control channel (ePDCCH) transmitted in a first ePDCCH set, determining a position of the ePDCCH and a subframe offset, and processing the indication of the dynamic resource offset, the position and the subframe offset to determine an allocated uplink control channel resource for the UE.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: June 28, 2016
    Assignee: BlackBerry Limited
    Inventors: Robert Mark Harrison, Shiwei Gao, Yufei Wu Blankenship
  • Patent number: 9332516
    Abstract: A method at a network element operating in a wireless network, wherein the network element is configured to transmit a default cell search signal at a default position in one or more subframes, the method comprising transmitting, by the network element, an auxiliary cell search signal in addition to the default cell search signal.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: May 3, 2016
    Assignee: BlackBerry Limited
    Inventors: Yufei Wu Blankenship, Yi Song, Youn Hyoung Heo, Yi Yu, Chandra Sekhar Bontu, Zhijun Cai
  • Publication number: 20160105266
    Abstract: A method is provided for communication in a wireless telecommunication system. The method comprises generating a sequence of signals of an enhanced physical HARQ (hybrid automatic repeat request) indicator channel (E-PHICH). The method further comprises mapping the sequence of signals of the E-PHICH to a first set of resource elements, wherein the first set of resource elements is multiplexed with a second set of resource elements over a set of virtual resource blocks, and wherein the second set of resource elements carries at least one of an enhanced physical downlink control channel (E-PDCCH) and a physical downlink shared channel (PDSCH).
    Type: Application
    Filed: December 14, 2015
    Publication date: April 14, 2016
    Inventors: Youn Hyoung Heo, Shiwei Gao, Hua Xu, Yufei Wu Blankenship, Yongkang Jia
  • Patent number: 9301281
    Abstract: A method for communication in a wireless telecommunications network is provided. The method comprises coordinating, by a wireless device, with a first network node to identify a first radio resource configuration comprising a first set of radio resources which is used by the wireless device to communicate with the first network node. The first set of radio resources comprises at least one of radio resources in which the wireless device transmits to the first network node, or radio resources in which the wireless device receives from the first network node.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: March 29, 2016
    Assignee: BlackBerry Limited
    Inventors: Robert Novak, William Anthony Gage, Biswaroop Mukherjee, Yufei Wu Blankenship
  • Publication number: 20160065333
    Abstract: A method is provided for communication in a wireless telecommunication system. The method comprises designating, by a network element, a first set of time-frequency resources for transmitting a first set of downlink control channels for a plurality of UEs, wherein the first set of time-frequency resources is known to the plurality of UEs, and wherein the first set of time-frequency resources varies from a first time interval to a second time interval. The method further comprises mapping, by the network element, a first downlink control channel to the first set of time-frequency resources. The method further comprises transmitting, by the network element, the first downlink control channel together with a downlink data channel in a frequency-division multiplexing manner.
    Type: Application
    Filed: October 28, 2015
    Publication date: March 3, 2016
    Inventors: Yufei Wu Blankenship, Shiwei Gao, Hua Xu
  • Publication number: 20160050607
    Abstract: A local wireless access network node receives a request to offload at least a portion of data traffic for a user equipment from a macro wireless access network node to the local wireless access network node, where the user equipment is to maintain a wireless connection to the macro wireless access network node after the offload. The local wireless access network node sends a response to indicate whether the local wireless access node has accepted or denied the request.
    Type: Application
    Filed: October 26, 2015
    Publication date: February 18, 2016
    Inventors: Shiwei Gao, Yufei Wu, Zhijun Cai, Yi Song
  • Patent number: 9258745
    Abstract: A method and network element for managing a relay node that is moving relative to a source network node, the method sending a handover request from a source network node to a target network node to prepare the handover at the target network node; sending a handover command from the source network node to the relay node without waiting for an acknowledgement of the handover request from the target network node; and detaching the relay node from the source network node.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 9, 2016
    Assignee: BlackBerry Limited
    Inventors: Yi Yu, Zhijun Cai, Yi Song, Yufei Wu Blankenship, Chandra Sekhar Bontu
  • Publication number: 20160021648
    Abstract: A method for communication in a wireless telecommunication system is provided. The method includes assigning a first cell of a first network node to a first timing advance group (TAG) of a user equipment (UE) and assigning a second cell of a second network node to a second TAG of the UE, wherein the second network node has a separate MAC (medium access control) scheduler from the first network node, and wherein the UE is able to transmit data on both the first and the second cell.
    Type: Application
    Filed: September 30, 2015
    Publication date: January 21, 2016
    Inventors: Yufei Wu Blankenship, Shiwei Gao, Hua Xu
  • Publication number: 20150365918
    Abstract: A method at a first device for enabling a device-to-device wireless link, the method detecting whether a presence signal of a second device is received over a first time period, the presence signal of the second device having a time-slot boundary; and if the presence signal of the second device is not detected, initiating a time-slot boundary by the first device including: transmitting a first presence signal of the first device in a selected time-slot; and checking for an acknowledgment to the first presence signal.
    Type: Application
    Filed: August 24, 2015
    Publication date: December 17, 2015
    Applicant: BlackBerry Limited
    Inventors: Yufei Wu Blankenship, Sagar Dhakal, Nam Nguyen
  • Publication number: 20150365869
    Abstract: A first wireless access network node receives common radio resource configuration information of a second wireless access network node. A data offload request is sent to the second wireless access network node to perform a data offload for a user equipment (UE) attached to the first wireless access network node.
    Type: Application
    Filed: August 24, 2015
    Publication date: December 17, 2015
    Inventors: Shiwei Gao, Yufei Wu Blankenship, Zhijun Cai, Yi Song
  • Patent number: 9215058
    Abstract: A method is provided for communication in a wireless telecommunication system. The method comprises generating a sequence of signals of an enhanced physical HARQ (hybrid automatic repeat request) indicator channel (E-PHICH). The method further comprises mapping the sequence of signals of the E-PHICH to a first set of resource elements, wherein the first set of resource elements is multiplexed with a second set of resource elements over a set of virtual resource blocks, and wherein the second set of resource elements carries at least one of an enhanced physical downlink control channel (E-PDCCH) and a physical downlink shared channel (PDSCH).
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: December 15, 2015
    Assignee: BlackBerry Limited
    Inventors: Youn Hyoung Heo, Shiwei Gao, Hua Xu, Yufei Wu Blankenship, Yongkang Jia
  • Patent number: 9210690
    Abstract: A method at a first device for enabling a device-to-device wireless link, the method detecting whether a presence signal of a second device is received over a first time period, the presence signal of the second device having a time-slot boundary; and if the presence signal of the second device is not detected, initiating a time-slot boundary by the first device including: transmitting a first presence signal of the first device in a selected time-slot; and checking for an acknowledgment to the first presence signal.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: December 8, 2015
    Assignee: BlackBerry Limited
    Inventors: Yufei Wu Blankenship, Sagar Dhakal, Nam Nguyen
  • Patent number: 9198181
    Abstract: A method is provided for communication in a wireless telecommunication system. The method comprises designating, by a network element, a first set of time-frequency resources for transmitting a first set of downlink control channels for a plurality of UEs, wherein the first set of time-frequency resources is known to the plurality of UEs, and wherein the first set of time-frequency resources varies from a first time interval to a second time interval. The method further comprises mapping, by the network element, a first downlink control channel to the first set of time-frequency resources. The method further comprises transmitting, by the network element, the first downlink control channel together with a downlink data channel in a frequency-division multiplexing manner.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: November 24, 2015
    Assignee: BlackBerry Limited
    Inventors: Yufei Wu Blankenship, Shiwei Gao, Hua Xu