Patents by Inventor Chang-Gang Zhang

Chang-Gang 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).

  • Patent number: 8050234
    Abstract: A cellular wireless communication system and method of operation manages Walsh codes in order to ensure that sufficient Walsh codes are available to prevent call blocking and to support additional hand-off operations. In an initial operating condition, the cellular wireless communication system services normal hand-off operations in which a maximum number of cells and sectors may participate in hand-off. With hand-off operations according to the present invention, each cell or sector participating in hand-off for a mobile terminal uses a unique Walsh code for covering its forward link signals. When the number of Walsh codes available for servicing new calls is reduced so that it meets or exceeds a Walsh code availability threshold, the number of cells and sectors that may participate in hand-off is reduced from the maximum number. In the number of participating cells/sectors results in release or non-use of some Walsh codes.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: November 1, 2011
    Assignee: Ericsson AB
    Inventors: Chang-Gang Zhang, Farhad Bassirat, Martin Kendall
  • Publication number: 20090232102
    Abstract: A cellular wireless communication system and method of operation manages Walsh codes in order to ensure that sufficient Walsh codes are available to prevent call blocking and to support additional hand-off operations. In an initial operating condition, the cellular wireless communication system services normal hand-off operations in which a maximum number of cells and sectors may participate in hand-off. With hand-off operations according to the present invention, each cell or sector participating in hand-off for a mobile terminal uses a unique Walsh code for covering its forward link signals. When the number of Walsh codes available for servicing new calls is reduced so that it meets or exceeds a Walsh code availability threshold, the number of cells and sectors that may participate in hand-off is reduced from the maximum number. In the number of participating cells/sectors results in release or non-use of some Walsh codes.
    Type: Application
    Filed: May 22, 2009
    Publication date: September 17, 2009
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Chang-Gang Zhang, Farhad Bassirat, Martin Kendall
  • Patent number: 7539162
    Abstract: A cellular wireless communication system and method of operation manages Walsh codes in order to ensure that sufficient Walsh codes are available to prevent call blocking and to support additional hand-off operations. In an initial operating condition, the cellular wireless communication system services normal hand-off operations in which a maximum number of cells and sectors may participate in hand-off. With hand-off operations according to the present invention, each cell or sector participating in hand-off for a mobile terminal uses a unique Walsh code for covering its forward link signals. When the number of Walsh codes available for servicing new calls is reduced so that it meets or exceeds a Walsh code availability threshold, the number of cells and sectors that may participate in hand-off is reduced from the maximum number. In the number of participating cells/sectors results in release or non-use of some Walsh codes.
    Type: Grant
    Filed: December 24, 2001
    Date of Patent: May 26, 2009
    Assignee: Nortel Networks Limited
    Inventors: Chang-Gang Zhang, Farhad Bassirat, Martin Kendall
  • Publication number: 20050041612
    Abstract: A cellular wireless communication system and method of operation manages Walsh codes in order to ensure that sufficient Walsh codes are available to prevent call blocking and to support additional hand-off operations. In an initial operating condition, the cellular wireless communication system services normal hand-off operations in which a maximum number of cells and sectors may participate in hand-off. With hand-off operations according to the present invention, each cell or sector participating in hand-off for a mobile terminal uses a unique Walsh code for covering its forward link signals. When the number of Walsh codes available for servicing new calls is reduced so that it meets or exceeds a Walsh code availability threshold, the number of cells and sectors that may participate in hand-off is reduced from the maximum number. In the number of participating cells/sectors results in release or non-use of some Walsh codes.
    Type: Application
    Filed: December 24, 2001
    Publication date: February 24, 2005
    Inventors: Chang-Gang Zhang, Farhad Bassirat, Martin Kendall
  • Patent number: 6721571
    Abstract: A wireless communication system infrastructure services wireless communications within a service coverage area. A digital enclosure includes a plurality of wireless communication processing components that perform digital processing functions. A plurality of radio enclosures couple to the digital enclosure via communication links and each service wireless communications within a corresponding geographic area of the service coverage area. During operation of the wireless communication system infrastructure, two radio enclosures of the plurality of radio enclosures share a communication processing component of the digital enclosure while jointly servicing a single wireless communication. The two radio enclosures reside at respective geographic locations that are separated by a geographic distance such that each of the radio enclosures services a respective cell. Each of the radio enclosures may service a plurality of sectors that form the cell.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: April 13, 2004
    Assignee: Nortel Networks Ltd.
    Inventors: Scott H. Tran, Farhad Bassirat, Chang-Gang Zhang, Kendall Martin
  • Patent number: 6694144
    Abstract: An improved method and system for providing reliable paging deliveries in a wireless communication network is disclosed. The mobile telephone communication network includes a mobile switching center (MSC), a base station controller (BSC), and a base transceiver station (BTS). Initially, each page messages is categorized under a respective message class accordingly. In response to a page message received from the BSC, a specific gain is assigned to the BTS for transmitting the received page message according to a respective message class to which the received page message belongs.
    Type: Grant
    Filed: August 30, 2000
    Date of Patent: February 17, 2004
    Assignee: Nortel Networks Limited
    Inventor: Chang-Gang Zhang
  • Publication number: 20020077149
    Abstract: A wireless communication system infrastructure services wireless communications within a service coverage area. A digital enclosure includes a plurality of wireless communication processing components that perform digital processing functions. A plurality of radio enclosures couple to the digital enclosure via communication links and each service wireless communications within a corresponding geographic area of the service coverage area. During operation of the wireless communication system infrastructure, two radio enclosures of the plurality of radio enclosures share a communication processing component of the digital enclosure while jointly servicing a single wireless communication. The two radio enclosures reside at respective geographic locations that are separated by a geographic distance such that each of the radio enclosures services a respective cell. Each of the radio enclosures may service a plurality of sectors that form the cell.
    Type: Application
    Filed: December 15, 2000
    Publication date: June 20, 2002
    Inventors: Scott H. Tran, Farhad Bassirat, Chang-Gang Zhang, Martin Kendall
  • Patent number: 5754945
    Abstract: In a cellular radio communications system, handoff of a mobile terminal from a serving base station to an adjacent base station is performed using two separate fuzzy logic procedures for handoff triggering and handoff targeting. For triggering, inputs to the fuzzy logic procedure are the signal strength for communications with the serving base station, a time since a failure to complete execution of a handoff, and, for mobile-assisted handoff (MAHO), signal strengths of communications between the mobile terminal and each of the adjacent base stations. If handoff is triggered, then handoff targeting is performed at a central unit. For targeting, inputs to the fuzzy logic procedure are the monitored signal strengths between the mobile terminal and each of the adjacent base stations, supplied either from the mobile terminal using MAHO or from the base stations, and the current loads of the adjacent base stations.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: May 19, 1998
    Assignee: Northern Telecom Limited
    Inventors: Jing-Yue Lin, Chang-Gang Zhang, Hong Zhao
  • Patent number: D986820
    Type: Grant
    Filed: July 16, 2021
    Date of Patent: May 23, 2023
    Assignee: HUNAN LIANKE TECHNOLOGY CO., LTD
    Inventors: Ke Lou, Zhenbin Zhou, Kaijun Zhou, Chang Gang Zhang