Patents by Inventor Hsien-Chang Liu

Hsien-Chang Liu 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: 9264967
    Abstract: A method is disclosed, operating a mobile station in a wireless network system comprising a plurality of base stations allocated in N channels. A Data packet is transmitted at a time interval p to a first base station of the wireless network system to which the mobile station is currently connected. Each of a plurality of partial scan sections is performed at the interval of every M data packets to monitor messages from the base stations of the N channels.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: February 16, 2016
    Assignee: MEDIATEK INC.
    Inventors: Hong-Kai Hsu, Hsien-Chang Liu, Yu Hsiang Lin
  • Patent number: 8838104
    Abstract: A mobile station operating in a wireless network system comprising a plurality of base stations is disclosed. A communication unit receives the messages from a first base station of the wireless network system to which the mobile station is currently connected. A signal detection unit detects a first averaged signal strength corresponding to the messages received from the first base station. A processor determines a scan period according to the first averaged signal strength, performing a background scan, at intervals during the scan period, to monitor messages from the plurality of base stations within the wireless network system.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: September 16, 2014
    Assignee: Mediatek Inc.
    Inventors: Hsien-Chang Liu, Hong-Kai Hsu
  • Patent number: 8780934
    Abstract: A method for performing serial transport communication is provided, where the method is utilized for performing communication between a plurality of devices, each of which provides a user with a plurality of wireless communication functions respectively complying with different wireless communication standards. The method includes: with regard to a first wireless communication function of the plurality of wireless communication functions, utilizing a serial transport protocol to perform communication between the plurality of devices through a transport bus; and with regard to a second wireless communication function of the plurality of wireless communication functions, utilizing the serial transport protocol to perform communication between the plurality of devices through the transport bus. An associated device is also provided.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: July 15, 2014
    Assignee: Mediatek Inc.
    Inventors: Wei-Lun Wan, Hsien-Chang Liu, Shuo-Jen Hsu, Chia-Hsuan Chuang, Chih-Hsuan Wang, Juei-Ting Sun
  • Publication number: 20130265902
    Abstract: A method is disclosed, operating a mobile station in a wireless network system comprising a plurality of base stations allocated in N channels. A Data packet is transmitted at a time interval p to a first base station of the wireless network system to which the mobile station is currently connected. Each of a plurality of partial scan sections is performed at the interval of every M data packets to monitor messages from the base stations of the N channels.
    Type: Application
    Filed: May 28, 2013
    Publication date: October 10, 2013
    Inventors: Hong-Kai HSU, Hsien-Chang LIU, Yu Hsiang LIN
  • Patent number: 8472373
    Abstract: A method is disclosed, operating a mobile station in a wireless network system comprising a plurality of base stations allocated in N channels. Data packets are received at a time interval p from a first base station of the wireless network system to which the mobile station is currently connected. A first period T is provided for a complete background scan monitoring messages from the plurality of base stations located in the wireless network system. The complete background scan is divided into a plurality of partial scan sections, each of which monitors base stations of one of the N channels. A second period M is determined for the partial scan section according to the time interval p, the first period T, and the number of channels N.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: June 25, 2013
    Assignee: Mediatek Inc.
    Inventors: Hong-Kai Hsu, Hsien-Chang Liu, Yu Hsiang Lin
  • Publication number: 20120287772
    Abstract: A method for performing serial transport communication is provided, where the method is utilized for performing communication between a plurality of devices, each of which provides a user with a plurality of wireless communication functions respectively complying with different wireless communication standards. The method includes: with regard to a first wireless communication function of the plurality of wireless communication functions, utilizing a serial transport protocol to perform communication between the plurality of devices through a transport bus; and with regard to a second wireless communication function of the plurality of wireless communication functions, utilizing the serial transport protocol to perform communication between the plurality of devices through the transport bus. An associated device is also provided.
    Type: Application
    Filed: November 1, 2011
    Publication date: November 15, 2012
    Inventors: Wei-Lun Wan, Hsien-Chang Liu, Shuo-Jen Hsu, Chia-Hsuan Chuang, Chih-Hsuan Wang, Juei-Ting Sun
  • Publication number: 20110314198
    Abstract: A wireless peripheral chip operable to connect to a host device is provided. The wireless peripheral chip includes a first wireless communication module providing a first wireless communication service for the host device and a second wireless communication module providing a second wireless communication service for the host device. The first wireless communication module and the second wireless communication module share at least one interrupt signal for communicating with the host device.
    Type: Application
    Filed: June 17, 2010
    Publication date: December 22, 2011
    Applicant: MEDIATEK INC.
    Inventors: Hsien-Chang Liu, Yun-Chang Chang
  • Patent number: 8082582
    Abstract: An authorization system of a navigation device includes a first identification (ID) module and a second ID module. The first ID module is arranged to perform authorization for a first portion of the navigation device, and the second ID module is arranged to perform authorization for a second portion of the navigation device. The first and the second ID modules perform bidirectional authorization of the first and the second portions, and further determine behavior of the navigation device according to a result of the bidirectional authorization. An associated authorization method for controlling the navigation device is further provided.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: December 20, 2011
    Assignee: Mediatek Inc.
    Inventors: Shr-Cheng Li, Hsien-Chang Liu, Yun-Chang Chang, An-Bang Chen
  • Patent number: 8077086
    Abstract: A method and apparatus for obtaining Global navigation Satellite System (GNSS) time in a GNSS receiver are provided. The following steps are included: obtaining a time relationship between a first clock signal and the received GNSS time; obtaining a first clock value of a second clock signal and an first associated clock value of the first clock signal at a first time point; calculating a first GNSS time corresponding to the first clock value of the second clock signal according to the first associated clock value and the time relationship; obtaining a second clock value of the second clock signal and an second associated clock value of the first clock signal at a second time point; and calculating a second GNSS time corresponding to the second associated clock value, according to the first GNSS time, the first clock value and the second clock value of the second clock signal.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: December 13, 2011
    Assignee: Mediatek Inc.
    Inventors: Kung-Shuan Huang, Hsien-Chang Liu, An-Bang Chen
  • Publication number: 20110163915
    Abstract: A method and apparatus for obtaining Global navigation Satellite System (GNSS) time in a GNSS receiver are provided. The following steps are included: obtaining a time relationship between a first clock signal and the received GNSS time; obtaining a first clock value of a second clock signal and an first associated clock value of the first clock signal at a first time point; calculating a first GNSS time corresponding to the first clock value of the second clock signal according to the first associated clock value and the time relationship; obtaining a second clock value of the second clock signal and an second associated clock value of the first clock signal at a second time point; and calculating a second GNSS time corresponding to the second associated clock value, according to the first GNSS time, the first clock value and the second clock value of the second clock signal.
    Type: Application
    Filed: March 18, 2011
    Publication date: July 7, 2011
    Inventors: Kung-Shuan Huang, Hsien-Chang Liu, An-Bang Chen
  • Patent number: 7936303
    Abstract: A method for obtaining GNSS time in a GNSS receiver includes: obtaining a time relationship between a first clock signal and the received GNSS time; obtaining a clock value B1 of a second clock signal and further obtaining an associated clock value A1 of the first clock signal to obtain a first pulse relationship at a first time point; calculating a GNSS time C1 corresponding to the clock value A1 according to the time relationship; obtaining a clock value B2 of the second clock signal and further obtaining an associated clock value A2 of the first clock signal to obtain a second pulse relationship at a second time point; and calculating a GNSS time C2 according to the GNSS time C1, the clock value B1, and the clock value B2. Exemplary values of A1, B1, C1, A2 B2, and C2 can be TTick1, FN1, TOW1, TTick2, FN2, and TOW2, respectively.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: May 3, 2011
    Assignee: Mediatek Inc.
    Inventors: Kung-Shuan Huang, Hsien-Chang Liu, An-Bang Chen
  • Publication number: 20110050495
    Abstract: A method for obtaining GNSS time in a GNSS receiver includes: obtaining a time relationship between a first clock signal and the received GNSS time; obtaining a clock value B1 of a second clock signal and further obtaining an associated clock value A1 of the first clock signal to obtain a first pulse relationship at a first time point; calculating a GNSS time C1 corresponding to the clock value A1 according to the time relationship; obtaining a clock value B2 of the second clock signal and further obtaining an associated clock value A2 of the first clock signal to obtain a second pulse relationship at a second time point; and calculating a GNSS time C2 according to the GNSS time C1, the clock value B1, and the clock value B2. Exemplary values of A1, B1, C1, A2 B2, and C2 can be TTick1, FN1, TOW1, TTick2, FN2, and TOW2, respectively.
    Type: Application
    Filed: December 30, 2008
    Publication date: March 3, 2011
    Inventors: Kung-Shuan Huang, Hsien-Chang Liu, An-Bang Chen
  • Patent number: 7813760
    Abstract: A method of controlling a communication mechanism utilized to arbitrate transmissions of a first and a second wireless signals and a communication apparatus utilized the method are disclosed. The method includes determining a transmission quality indicator corresponding to one of the first wireless signal and the second wireless signal, and dynamically turning the communication mechanism on or off according to the transmission quality indicator. Therefore, the present invention is able to arbitrate transmissions of different wireless signals while decreasing the occurrence of transmission disconnection resulted from the arbitration.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: October 12, 2010
    Assignee: Mediatek Inc.
    Inventors: Hong-Kai Hsu, Hsien-Chang Liu
  • Publication number: 20090293115
    Abstract: An authorization system of a navigation device includes a first identification (ID) module and a second ID module. The first ID module is arranged to perform authorization for a first portion of the navigation device, and the second ID module is arranged to perform authorization for a second portion of the navigation device. The first and the second ID modules perform bidirectional authorization of the first and the second portions, and further determine behavior of the navigation device according to a result of the bidirectional authorization. An associated authorization method for controlling the navigation device is further provided.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Inventors: Shr-Cheng Li, Hsien-Chang Liu, Yun-Chang Chang, An-Bang Chen
  • Publication number: 20090004979
    Abstract: A method of controlling a communication mechanism utilized to arbitrate transmissions of a first and a second wireless signals and a communication apparatus utilized the method are disclosed. The method includes determining a transmission quality indicator corresponding to one of the first wireless signal and the second wireless signal, and dynamically turning the communication mechanism on or off according to the transmission quality indicator. Therefore, the present invention is able to arbitrate transmissions of different wireless signals while decreasing the occurrence of transmission disconnection resulted from the arbitration.
    Type: Application
    Filed: June 27, 2007
    Publication date: January 1, 2009
    Inventors: Hong-Kai Hsu, Hsien-Chang Liu
  • Publication number: 20080096572
    Abstract: A method is disclosed, operating a mobile station in a wireless network system comprising a plurality of base stations allocated in N channels. Data packets are received at a time interval p from a first base station of the wireless network system to which the mobile station is currently connected. A first period T is provided for a complete background scan monitoring messages from the plurality of base stations located in the wireless network system. The complete background scan is divided into a plurality of partial scan sections, each of which monitors base stations of one of the N channels. A second period M is determined for the partial scan section according to the time interval p, the first period T, and the number of channels N.
    Type: Application
    Filed: July 9, 2007
    Publication date: April 24, 2008
    Applicant: MEDIATEK INC.
    Inventors: Hong-Kai Hsu, Hsien-Chang Liu, Yu Hsiang Lin
  • Publication number: 20080096561
    Abstract: A mobile station operating in a wireless network system comprising a plurality of base stations is disclosed. A communication unit receives the messages from a first base station of the wireless network system to which the mobile station is currently connected. A signal detection unit detects a first averaged signal strength corresponding to the messages received from the first base station. A processor determines a scan period according to the first averaged signal strength, performing a background scan, at intervals during the scan period, to monitor messages from the plurality of base stations within the wireless network system.
    Type: Application
    Filed: July 9, 2007
    Publication date: April 24, 2008
    Applicant: MEDIATEK INC.
    Inventors: Hsien-Chang Liu, Hong-Kai Hsu