Patents by Inventor David C. Shrader

David C. Shrader 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).

  • Seamless handoff across heterogeneous access networks using a handoff controller in a service control point
    Patent number: 8442005
    Abstract: In a telecommunications network in which a mobile handset is capable of communicating in both an IP domain and a non-IP domain, the handoff of an existing communications session between the mobile handset and a fixed user is facilitated by a handoff controller implemented in a service control point. The handoff controller implements different handoff methods depending on the status of the fixed user and the transition of the mobile user. Additionally 802.21 Media Independent Handover Function in conjunction with SIP is used to facilitate handover between IP and Non-IP points in the system.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: May 14, 2013
    Assignee: TTI Inventions C LLC
    Inventors: Ashutosh Dutta, Subir Das, Donald R. Lukacs, Tao Zhang, David C. Shrader, Raquel Morera Sempere, Stephanie Demers, Bryan J. Lyles, James Alfieri
  • Seamless Handoff Across Heterogeneous Access Networks Using a Handoff Controller in a Service Control Point
    Publication number: 20100150110
    Abstract: In a telecommunications network in which a mobile handset is capable of communicating in both an IP domain and a non-IP domain, the handoff of an existing communications session between the mobile handset and a fixed user is facilitated by a handoff controller implemented in a service control point. The handoff controller implements different handoff methods depending on the status of the fixed user and the transition of the mobile user. Additionally 802.21 Media Independent Handover Function in conjunction with SIP is used to facilitate handover between IP and Non-IP points in the system.
    Type: Application
    Filed: December 15, 2009
    Publication date: June 17, 2010
    Inventors: Ashutosh Dutta, Subir Das, Donald R. Lukacs, Tao Zhang, David C. Shrader, Raquel Morera Sempere, Stephanie Demers, Bryan J. Lyles, James Alfieri
  • Seamless handoff across heterogeneous access networks using a handoff controller in a service control point
    Patent number: 7664501
    Abstract: In a telecommunications network in which a mobile handset is capable of communicating in both an IP domain and a non-IP domain, the handoff of an existing communications session between the mobile handset and a fixed user is facilitated by a handoff controller implemented in a service control point. The handoff controller implements different handoff methods depending on the status of the fixed user and the transition of the mobile user. Additionally 802.21 Media Independent Handover Function in conjunction with SIP is used to facilitate handover between IP and Non-IP points in the system.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: February 16, 2010
    Inventors: Ashutosh Dutta, Subir Das, Donald R. Lukacs, Tao Zhang, David C. Shrader, Raquel Morera Sempere, Stephanie Demers, Bryan J. Lyles, James Alfieri
  • System and method for using integrated services digital networks (ISDN) and the call appearance call handling (CACH) feature of electronic key telephone service (EKTS) technology for mobile systems
    Patent number: 5521963
    Abstract: A mobile call processing methodology and concomitant system based on ISDN/CACH-EKTS technology which can broadcast incoming calls to base stations (e.g., 1050) and which uses the ISDN/CACH-EKTS bridging technology to handle base station handoff of an established call. Each mobile user (e.g., 1041, 1042) is assigned a unique EKTS directory number as well as a unique call appearance identifier, which allows for the handling of multiple call appearances of the unique DN on a single base station. For a given mobile communication application, the central office (e.g., 1014) treats the base station as an ISDN/CACH-EKTS terminal.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: May 28, 1996
    Assignee: Siemens Stromberg-Carlson
    Inventors: David C. Shrader, Gary L. Hitchcock, Feza H. Buyukdura, Edwin R. Ely