Patents by Inventor Chih--Hsuan Tang

Chih--Hsuan Tang 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: 8243670
    Abstract: A user grouping method for inter-cell interference coordination technology in mobile telecommunication systems using the handover information and measured data that were defined in existing mobile telecommunication systems to group cell users into cell center users and cell edge users. This method includes: (1) user equipment measuring the average signal strength of the serving cell and neighboring cells; (2) user equipment determining if it should reply with the average signal strength information it measures and if it should initiate the inter-cell interference coordination measuring and response system; (3) serving cell then groups the user equipment as cell center user or cell edge user according to the average signal strength information reported by the user equipment; (4) serving cell allocates a frequency subchannel from cell center subband or cell edge subband according to the grouping result.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: August 14, 2012
    Assignee: Chunghwa Telecom Co., Ltd.
    Inventors: Che-Sheng Chiu, Chih-Hsuan Tang
  • Patent number: 8086180
    Abstract: A method for restraining inter-cell interference in a mobile communication system is provided. The method uses the fast dynamic selection of the Fractional Frequency Reuse (FFR) technology and the Macro Diversity (MD) technology of the cell edge to increase the cell edge user data rate and provide excellent system capacity. The method is particularly suitable in a OFDMA mobile communication system downlink. The method comprises the steps of: (a) determining whether the cell edge user is able to operate the MD technology; (b) processing the fast dynamic selection of the FFR technology and the MD technology for the cell edge user, and the selection is made based on a instantaneous link Signal Quality Index (SQI); and (c) allocating the center subband or the edge subband to the cell edge user according to the selection.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: December 27, 2011
    Assignee: Chunghwa Telecom Co., Ltd.
    Inventors: Che-Sheng Chiu, Chih--Hsuan Tang, Chia-Horng Liu
  • Publication number: 20110045831
    Abstract: A user grouping method for inter-cell interference coordination technology in mobile telecommunication systems using the handover information and measured data that were defined in existing mobile telecommunication systems to group cell users into cell center users and cell edge users. This method includes: (1) user equipment measuring the average signal strength of the serving cell and neighboring cells; (2) user equipment determining if it should reply with the average signal strength information it measures and if it should initiate the inter-cell interference coordination measuring and response system; (3) serving cell then groups the user equipment as cell center user or cell edge user according to the average signal strength information reported by the user equipment; (4) serving cell allocates a frequency subchannel from cell center subband or cell edge subband according to the grouping result.
    Type: Application
    Filed: August 19, 2009
    Publication date: February 24, 2011
    Applicant: CHUNGHWA TELECOM CO., LTD.
    Inventors: Che-Sheng Chiu, Chih-Hsuan Tang
  • Publication number: 20100267338
    Abstract: A method for restraining inter-cell interference in a mobile communication system is provided. The method uses the fast dynamic selection of the Fractional Frequency Reuse (FFR) technology and the Macro Diversity (MD) technology of the cell edge to increase the cell edge user data rate and provide excellent system capacity. The method is particularly suitable in a OFDMA mobile communication system downlink. The method comprises the steps of: (a) determining whether the cell edge user is able to operate the MD technology; (b) processing the fast dynamic selection of the FFR technology and the MD technology for the cell edge user, and the selection is made based on a instantaneous link Signal Quality Index (SQI); and (c) allocating the center subband or the edge subband to the cell edge user according to the selection.
    Type: Application
    Filed: April 21, 2009
    Publication date: October 21, 2010
    Applicant: Chunghwa Telecom Co., Ltd
    Inventors: Che-Sheng Chiu, Chih--Hsuan Tang, Chia-Horng Liu