Patents by Inventor Ruoju Liu

Ruoju 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).

  • Method for positioning mobile devices and apparatus for positioning mobile devices
    Patent number: 8588087
    Abstract: The present invention relates to a mobile communication field. The present invention provides a method and an apparatus for WiMAX positioning by downlink preamble fast detection DPFD. The method comprises steps of: Mobile user station MSS detects downlink preambles from BSs, all of which are synchronized by in TDD mode mobile WiMAX; the TDoA of different BSs' preamble is get through preamble-based synchronization detection; and the exact location is calculated through classical TDoA algorithms. The embodiment of the present invention describes a novel concept for measuring the position of the mobile user equipment by the uplink ranging assistant downlink preamble detection. With the mobile WiMAX is accepted as a 3G standard by ITU and widely populated, the position based on WiMAX will be a market-potential service.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: November 19, 2013
    Assignee: Alcatel Lucent
    Inventors: Wenhua Jiao, Pin Jiang, Yuanyuan Ma, Ruoju Liu
  • METHOD FOR POSITIONING MOBILE DEVICES AND APPARATUS FOR POSITIONING MOBILE DEVICES
    Publication number: 20110019567
    Abstract: The present invention relates to a mobile communication field. The present invention provides a method and an apparatus for WiMAX positioning by downlink preamble fast detection DPFD. The method comprises steps of: Mobile user station MSS detects downlink preambles from BSs, all of which are synchronized by in TDD mode mobile WiMAX; the TDoA of different BSs' preamble is get through preamble-based synchronization detection; and the exact location is calculated through classical TDoA algorithms. The embodiment of the present invention describes a novel concept for measuring the position of the mobile user equipment by the uplink ranging assistant downlink preamble detection. With the mobile WiMAX is accepted as a 3G standard by ITU and widely populated, the position based on WiMAX will be a market-potential service.
    Type: Application
    Filed: January 29, 2008
    Publication date: January 27, 2011
    Inventors: Wenhua Jiao, Pin Jiang, Yuanyuan Ma, Ruoju Liu