Patents by Inventor Sang Kyoon Hyun

Sang Kyoon Hyun 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).

  • Handoff control in an enterprise division multiple access wireless system
    Patent number: 7965685
    Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the BTS, BSC and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.
    Type: Grant
    Filed: April 18, 2005
    Date of Patent: June 21, 2011
    Assignee: Cisco Technology, Inc.
    Inventors: Ki Hyun Joo, Peter S. Rha, Chol Su Kang, Sang Kyoon Hyun
  • Adaptive link delay management in wireless link systems
    Patent number: 7813385
    Abstract: Systems and methods for adapting IEEE 802.11 wireless communications for environments involving long propagation delays. Improved system throughput and stability are provided. Propagation delays are measured systematically and used to adjust contention timing boundaries and a common time slot duration. This reduces the probability of collision in the CSMA/CA mode of the IEEE 802.11 standard. One particular application is a point-to-multipoint campus bridge network.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: October 12, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Sang Kyoon Hyun, Bretton Douglas
  • Method of handoff control in an enterprise code division multiple access wireless system
    Patent number: 7154870
    Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller (BSC), a mobile switch controller (MSC), and an ethernet interface module for coupling the wireless internet base station (WIBS) to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the base station transceiver subsystem BTS, BSC, and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.
    Type: Grant
    Filed: August 5, 2005
    Date of Patent: December 26, 2006
    Assignee: Cisco Technology, Inc.
    Inventors: Ki Hyun Joo, Peter S. Rha, Chol Su Kang, Sang Kyoon Hyun
  • Method of handoff control in an enterprise code division multiple access wireless system
    Patent number: 7016331
    Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller (BSC), a mobile switch controller (MSC), and an ethernet interface module for coupling the wireless internet base station (WIBS) to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the base station transceiver subsystem BTS, BSC, and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: March 21, 2006
    Assignee: Cisco Technology, Inc.
    Inventors: Ki Hyun Joo, Peter S. Rha, Chol Su Kang, Sang Kyoon Hyun
  • In-building code division multiple access wireless system and method
    Patent number: 6967938
    Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller, and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. The interface module provides for coupling the WIBS to an ethernet back-bone, a mobile communication unit and a public switch telephone network (PSTN). In one embodiment, the wireless communication system includes a wireless internet server which also encompasses base station controller and mobile switch controller functions to enable the wireless communication system to manage call mobility with the system. In one embodiment, communication between the WIBS and the PSTN is in an IP data protocol format. The WIBs provides control and sequencing of all call control operations by handling both voice and data calls which are transmitted over the ethernet back-bone to the PSN or the internet.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: November 22, 2005
    Assignee: Cisco Technology, Inc.
    Inventors: Chol Su Kang, Sang Kyoon Hyun, Ki Hyun Joo
  • Handoff control in an enterprise division multiple access wireless system
    Patent number: 6901061
    Abstract: A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the BTS, BSC and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: May 31, 2005
    Assignee: Cisco Technology, Inc.
    Inventors: Ki Hyun Joo, Peter S. Rha, Chol Su Kang, Sang Kyoon Hyun