Patents by Inventor Khosrow Sohraby

Khosrow Sohraby 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).

  • Publication number: 20050259629
    Abstract: Methods and systems for communicating in a wireless network using time division duplex (TDD) protocols. The ratio for uplink and downlink subframes of a physical frame may be dynamically adjusted as traffic stream requirements of the wireless network change. In certain embodiments, the wireless network is a wireless metropolitan area network (WMAN) utilizing orthogonal frequency division multiplexing (OFDM). Various specific embodiments and variations are also disclosed.
    Type: Application
    Filed: May 24, 2004
    Publication date: November 24, 2005
    Inventors: Neal Oliver, Oleg Gusak, Khosrow Sohraby
  • Patent number: 5311513
    Abstract: A congestion control system for packet communications networks in which access to the network is controlled to prevent such congestion. Packets within the prespecified statistical description of each packet source are marked as high priority ("green" packets) while packets exceeding the pre-specified characteristics are marked with a lower priority ("red" packets). The overall red packet rate is limited to prevent red packet saturation of the network. Packets are marked red for a continuous train of successive red packets. The introduction of red packets into the network is subjected to a degree of hysteresis to provide better interaction with higher layer error recovery protocols. The amount of hysteresis introduced into the red packet marking can be fixed or varied, depending on the statistics of the incoming data packets at the entry point to the network.
    Type: Grant
    Filed: September 10, 1992
    Date of Patent: May 10, 1994
    Assignee: International Business Machines Corp.
    Inventors: Hamid Ahmadi, Jeffrey, H. Derby, Roch Guerin, Levent Gun, Gerald A. Marin, Mahmoud Naghshineh, Khosrow Sohraby