Patents by Inventor Derek Yu

Derek 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: 7548758
    Abstract: Systems and methods are provided for delivering both PMP communications, for example standard cellular communications via a base station, and also delivering P2P communications, for example, communications between two mobile stations, using the same spectral resources for both types of communication.
    Type: Grant
    Filed: April 2, 2004
    Date of Patent: June 16, 2009
    Assignee: Nortel Networks Limited
    Inventors: Shalini Periyalwar, Hang Zhang, Nimal Senarath, Derek Yu, Kelvin Kar-Kin Au, Karl Mann
  • Publication number: 20090141668
    Abstract: A method and system for wireless communication in which a plurality of media access control (“MAC”) packet data units (“PDUs”) corresponding to a plurality of wireless communication connections are received. The plurality of MAC PDUs is grouped into a relay packet and the relay packet is transmitted. Such grouping and transmission of the relay packet is performed by one or more relay nodes. The traffic control for the transmission can also be based on centralized or decentralized routing control and/or centralized or decentralized QoS control.
    Type: Application
    Filed: May 11, 2007
    Publication date: June 4, 2009
    Applicant: Nortel Networks Limited
    Inventors: Hang Zhang, Peiying Zhu, Mo-Han Fong, Wen Tong, Nimal Senarath, Derek Yu, David Steer, Curtis S. Dodd
  • Publication number: 20090053994
    Abstract: A wireless network includes a base station and a relay station for extending wireless coverage of the base station. Downlink data is sent by the base station and relayed through the relay station to a mobile station, where the downlink data is associated with a preamble that is sent directly from the base station to the mobile station. A transmit power of the relay station is adjusted for transmitting the downlink data from the relay station to the mobile station to reduce a difference between a first power level of the preamble received at the mobile station and a second power level of the downlink data received at the mobile station. The uplink transmit power of the mobile station for the data sent to the relay station is adjusted to compensate for the difference in path loss from mobile station to base station and mobile station to relay station and to compensate for the difference in noise_plus_interference level at relay station compared to that of the base station.
    Type: Application
    Filed: August 25, 2008
    Publication date: February 26, 2009
    Applicant: Nortel Networks Limited
    Inventors: Nimal Senarath, David Steer, Derek Yu, Hang Zhang, Peiying Zhu, Wen Tong, Israfil Bahceci
  • Publication number: 20090016259
    Abstract: One or more relay stations may be employed along a wireless communication access path between an ingress station and an egress station. A logical communication tunnel is established between the ingress and egress stations through any number of intermediate relay stations to handle session flows of PDUs. As PDUs arrive, the ingress station may determine and add scheduling information to the PDUs before they are delivered to the downstream intermediate relay stations or egress stations. The scheduling information is used by the downstream stations to schedule the PDUs for further delivery. The scheduling information may also be used by the egress station to schedule the PDUs for delivery. The scheduling information added to the PDU by the ingress station bears on a QoS class associated with the PDU, a deadline for the egress station to deliver the PDU, or a combination thereof.
    Type: Application
    Filed: July 14, 2008
    Publication date: January 15, 2009
    Applicant: Nortel Networks Limited
    Inventors: Hang Zhang, Peiying Zhu, Wen Tong, Gamini Senarath, Derek Yu, David G. Steer
  • Publication number: 20090016258
    Abstract: One or more relay stations may be employed along a wireless communication access path between an ingress station and an egress station. A logical communication tunnel is established between the ingress and egress stations through any number of intermediate relay stations to handle session flows of PDUs. As PDUs arrive, the ingress station may determine and add scheduling information to the PDUs before they are delivered to the downstream intermediate relay stations or egress stations. The scheduling information is used by the downstream stations to schedule the PDUs for further delivery. The scheduling information may also be used by the egress station to schedule the PDUs for delivery. The scheduling information added to the PDU by the ingress station bears on a QoS class associated with the PDU, a deadline for the egress station to deliver the PDU, or a combination thereof.
    Type: Application
    Filed: July 14, 2008
    Publication date: January 15, 2009
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Hang Zhang, Peiying Zhu, Wen Tong, Gamini Senarath, Derek Yu, David G. Steer
  • Publication number: 20080080409
    Abstract: Methods and systems for providing efficient communications between two mobile stations served by the same base station or relay station are provided. A base station maintains information identifying which mobile stations it is serving. When a connection is set up between two mobile stations, if they are both being served by the same base station, the base station forwards traffic directly between the two mobile stations without forwarding it on to higher level network entities.
    Type: Application
    Filed: September 28, 2007
    Publication date: April 3, 2008
    Inventors: Hang Zhang, Peiying Zhu, Wen Tong, Nimal Senarath, Derek Yu
  • Publication number: 20050239451
    Abstract: Systems and methods are provided for delivering both PMP communications, for example standard cellular communications via a base station, and also delivering P2P communications, for example, communications between two mobile stations, using the same spectral resources for both types of communication.
    Type: Application
    Filed: April 2, 2004
    Publication date: October 27, 2005
    Inventors: Shalini Periyalwar, Hang Zhang, Nimal Senarath, Derek Yu, Kelvin Au, Karl Mann
  • Publication number: 20050020273
    Abstract: The present invention provides for a scheduling scheme to be used with respect to a given mobile station. It is determined whether the given mobile station is or is not in soft-handoff. This is performed through examining a reduced active set. The reduced active set is based upon the active set, and the selection of the reduced active set includes considerations such as received reverse link channel signal strength. If the mobile station is in soft hand-off or with reduced active set size of greater than one, congestion control scheduling of reverse link communications from the given mobile station is utilized, using a data rate set by the congestion control of the reverse link channel. If the mobile station is not in soft-handoff or with reduced active set size of one, explicit scheduling of the reverse link communications from the given mobile station is utilized, using a data rate set by the explicit data rate control of the reverse link channel.
    Type: Application
    Filed: July 24, 2003
    Publication date: January 27, 2005
    Applicant: Nortel Networks Limited
    Inventors: Mo-Han Fong, Derek Yu, Jun Li, Ashvin Chheda, Wen Tong, Geng Wu