Patents by Inventor Derek K. Yu

Derek K. Yu 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: 7965668
    Abstract: Apparatus and methods are provided for transitioning wireless devices between a plurality of states having increasing resource intensity from a least resource intensive state to a most resource intensive second state. All power-on wireless devices are ranked. A respective subset of the power-on wireless devices is assigned to each state, the power-on wireless devices of the subsets having rankings which increase with resource intensity of the state. Signalling is generated to the wireless devices to instruct them to implement any change in state. The priorities which are calculated for the purpose of state scheduling are preferably the same as those, or at least based upon the priorities used for packet scheduling.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: June 21, 2011
    Assignee: Ericsson AB
    Inventors: Hang Zhang, Mo-Han Fong, Sophie Vrzic, Derek K. Yu
  • Patent number: 7508780
    Abstract: Apparatus and methods are provided for transitioning wireless devices between a plurality of states having increasing resource intensity from a least resource intensive state to a most resource intensive second state. All power-on wireless devices are ranked. A respective subset of the power-on wireless devices is assigned to each state, the power-on wireless devices of the subsets having rankings which increase with resource intensity of the state. Signalling is generated to the wireless devices to instruct them to implement any change in state. The priorities which are calculated for the purpose of state scheduling are preferably the same as those, or at least based upon the priorities used for packet scheduling.
    Type: Grant
    Filed: January 17, 2003
    Date of Patent: March 24, 2009
    Assignee: Nortel Networks Limited
    Inventors: Hang Zhang, Mo-Han Fong, Sophie Vrzic, Derek K. Yu
  • Publication number: 20090023468
    Abstract: Apparatus and methods are provided for transitioning wireless devices between a plurality of states having increasing resource intensity from a least resource intensive state to a most resource intensive second state. All power-on wireless devices are ranked. A respective subset of the power-on wireless devices is assigned to each state, the power-on wireless devices of the subsets having rankings which increase with resource intensity of the state. Signalling is generated to the wireless devices to instruct them to implement any change in state. The priorities which are calculated for the purpose of state scheduling are preferably the same as those, or at least based upon the priorities used for packet scheduling.
    Type: Application
    Filed: October 1, 2008
    Publication date: January 22, 2009
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: HANG ZHANG, MO-HAN FONG, SOPHIE VRZIC, DEREK K. YU
  • Patent number: 7072319
    Abstract: A method for allocating orthogonal codes, whereby the product of a number of active users in the system and the average number of sectors servicing each user is determined, and sufficient orthogonal codes are allocated to service the product of F and the optimal number of active users in the system. At least one message is transmitted for reception by at least one mobile station, the message indicating the number of allocated orthogonal codes.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: July 4, 2006
    Assignee: Nortel Networks Limited
    Inventors: Jun Li, Mo-Han Fong, Derek K. Yu
  • Patent number: 6760860
    Abstract: A base station, mobile station, and/or other terminal includes physical layer (layer 1) protocol and link layer (layer 2) protocol enhancements that interact with one another to cause the link layer protocol to inhibit is ARQ operations for data blocks having missing data packets that are still pending at the physical layer. A mobile station (or base station) receives a data packet from a base station across a wireless link. The physical layer then determines, a number, N, of data packets pending with its physical layer Automatic Retransmission reQuest (ARQ) operations. The physical layer then passes the data packet and the number, N, to a link layer operating on the mobile station. The link layer then modifies its ARQ operations based upon the number, N, of data packets pending with the physical layer ARQ operations. The link layer inhibits ARQ operations for data blocks missing data packets that are still pending with the physical layer.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: July 6, 2004
    Assignee: Nortel Networks Limited
    Inventors: Mo-Han Fong, Zhang Hang, Geng Wu, Derek K. Yu, Alfred R. Schmidt
  • Publication number: 20030166408
    Abstract: Apparatus and methods are provided for transitioning wireless devices between a plurality of states having increasing resource intensity from a least resource intensive state to a most resource intensive second state. All power-on wireless devices are ranked. A respective subset of the power-on wireless devices is assigned to each state, the power-on wireless devices of the subsets having rankings which increase with resource intensity of the state. Signalling is generated to the wireless devices to instruct them to implement any change in state. The priorities which are calculated for the purpose of state scheduling are preferably the same as those, or at least based upon the priorities used for packet scheduling.
    Type: Application
    Filed: January 17, 2003
    Publication date: September 4, 2003
    Inventors: Hang Zhang, Mo-Han Fong, Sophie Vrzic, Derek K. Yu
  • Publication number: 20030112777
    Abstract: A method for allocating orthogonal codes, whereby the product of a number of active users in the system and the average number of sectors servicing each user is determined, and sufficient orthogonal codes are allocated to service the product of F and the optimal number of active users in the system. At least one message is transmitted for reception by at least one mobile station, the message indicating the number of allocated orthogonal codes.
    Type: Application
    Filed: December 19, 2001
    Publication date: June 19, 2003
    Applicant: Nortel Networks Corporation
    Inventors: Jun Li, Mo-Han Fong, Derek K. Yu