Patents by Inventor Roy E. Hanzel

Roy E. Hanzel 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).

  • System and method for performing hand-offs between internet protocol (IP) core networks in the wireless domain
    Patent number: 6961774
    Abstract: A system for performing a hand-off between two IP core networks in the wireless domain includes a source mobility control function (MCF) within a source IP core network that is coupled to a source access network providing service to a mobile unit. The source MCF is coupled to a source bearer path gateway (BPGW) within the source IP core network. The source BPGW communicates bearer traffic associated with the mobile unit between the source access network and a public switched telephone network (PSTN) gateway within the source IP core network. The PSTN gateway communicates the bearer traffic between the source BPGW and a PSTN coupled to the source IP core network. The source MCF is functionally separate from a call agent (CA) within the source IP core network. The CA is also coupled to the source BPGW.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: November 1, 2005
    Assignee: Cisco Technology, Inc.
    Inventors: Michael L. Shannon, Manjari Asawa, Roy E. Hanzel