Patents by Inventor Rui Chu Chang

Rui Chu Chang 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: 9560531
    Abstract: A method and system for joint wireless and fixed network optimization for heterogeneous cellular networks includes performing a feasibility evaluation for an x-haul network comprising at least one of a fronthaul network and a backhaul network, after determining base station locations and radio frequency (RF) parameters. The feasibility evaluation may determine, based on a network graph, which small cell locations are accessible according to actual network demand and based on cost metrics for different types of network links.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: January 31, 2017
    Assignee: Fujitsu Limited
    Inventors: Rui Chu Chang, Ryan Pettijohn, Hiroyuki Seki, Yasuhiko Aoki
  • Patent number: 8862133
    Abstract: A method for determining the speed of a wireless device includes the steps of receiving channel quality indicator data, determining the fast fading characteristics of the received channel quality indicator data, comparing the fast fading characteristics of the received channel quality indicator data against benchmark channel quality indicator data, and determining the speed of the wireless device based on the comparison. The channel quality indicator data is indicative of the signal quality at a wireless device. The benchmark data includes fast fading characteristics.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: October 14, 2014
    Assignee: Fujitsu Limited
    Inventor: Rui Chu Chang
  • Patent number: 8774848
    Abstract: A method may include scheduling for the downlink control channel, by a first base station during a partial loading sub-frame, at least a first group of wireless communication devices present in the first cell, the first group of wireless communication devices comprising wireless communication devices determined by the first base station to be near an edge of the first cell. The method may additionally include scheduling for the downlink control channel, by the first base station during a normal loading sub-frame, at least one other group of wireless communication devices present in the first cell other than wireless communication devices in the first group of wireless communication devices, the at least one other group of wireless communication devices determined by the first base station to be in greater proximity to the first case station than wireless communication devices in the first class.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: July 8, 2014
    Assignee: Fujitsu Limited
    Inventor: Rui Chu Chang
  • Publication number: 20130090143
    Abstract: A method may include scheduling for the downlink control channel, by a first base station during a partial loading sub-frame, at least a first group of wireless communication devices present in the first cell, the first group of wireless communication devices comprising wireless communication devices determined by the first base station to be near an edge of the first cell. The method may additionally include scheduling for the downlink control channel, by the first base station during a normal loading sub-frame, at least one other group of wireless communication devices present in the first cell other than wireless communication devices in the first group of wireless communication devices, the at least one other group of wireless communication devices determined by the first base station to be in greater proximity to the first case station than wireless communication devices in the first class.
    Type: Application
    Filed: October 11, 2011
    Publication date: April 11, 2013
    Applicant: FUJITSU NETWORK COMMUNICATIONS, INC.
    Inventor: Rui Chu Chang
  • Publication number: 20110117915
    Abstract: A method for determining the speed of a wireless device includes the steps of receiving channel quality indicator data, determining the fast fading characteristics of the received channel quality indicator data, comparing the fast fading characteristics of the received channel quality indicator data against benchmark channel quality indicator data, and determining the speed of the wireless device based on the comparison. The channel quality indicator data is indicative of the signal quality at a wireless device. The benchmark data includes fast fading characteristics.
    Type: Application
    Filed: November 19, 2009
    Publication date: May 19, 2011
    Applicant: Fujitsu Network Communications, Inc.
    Inventor: Rui Chu Chang