Patents by Inventor Liem Q. Le

Liem Q. Le 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).

  • Method and system for switching between two network access technologies without interrupting active network applications
    Patent number: 7177952
    Abstract: A system and method is provided for seamlessly switching between different network access technologies without interrupting active network applications or sessions. A Network Access Arbitrator (NAA), which contains a virtual network adapter driver, resides between a Data Link Layer and a Network Layer of the standard OSI-7 Layer Protocol Stack for controlling necessary switching between different network access technologies. Since all network applications are controlled by layers residing on or above the Network Layer, all applications using network services provided by the Network Layer will continue their active network sessions or applications without disruption, as the NAA switches between different network access technologies.
    Type: Grant
    Filed: August 2, 2000
    Date of Patent: February 13, 2007
    Assignee: Nortel Networks Limited
    Inventors: Donald L. Wurch, Liem Q. Le, Carey B. Becker, Emad A. Qaddoura, Russ C. Coffin
  • Internet protocol mobility architecture framework
    Patent number: 7079499
    Abstract: A communications architecture for enabling IP-based mobile communications includes a Local Service Function (LSF) component configured to serve as an IP-based serving area network for a set of x-Access Networks, and a Network Service Function (NSF) component configured to serve as an IP-based home network by managing a MN's subscription and associated profile so that the MN is authorized to use the resources of the LSF. An x-Access Network (xAN) is interconnected to the LSF and NSF for providing heterogeneous Layer 2 access for MNs irrespective of access technology.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: July 18, 2006
    Assignee: Nortel Networks Limited
    Inventors: Haseeb Akhtar, Emad A. Qaddoura, Russell C. Coffin, Liem Q. Le, Zemin Zhu
  • Unified directory services architecture for an IP mobility architecture framework
    Patent number: 6769000
    Abstract: A communications architecture for enabling IP-based mobile communications includes a Local Service Function (LSF) component configured to serve as an IP-based serving area network for a set of x-Access Networks, and a Network Service Function (NSF) component configured to serve as an IP-based home network by managing a MN's subscription and associated profile so that the MN is authorized to use the resources of the LSF. An x-Access Network (xAN) is interconnected to the LSF and NSF for providing heterogeneous Layer 2 access for MNs irrespective of access technology.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: July 27, 2004
    Assignee: Nortel Networks Limited
    Inventors: Haseeb Akhtar, Emad A. Qaddoura, Russell C. Coffin, Liem Q. Le, Zemin Zhu
  • Reduced overhead tunneling techniques in a communications network having mobile foreign agents
    Patent number: 6574214
    Abstract: In a mobile communication system having mobile foreign agents, the present invention eliminates the use of multiple source/destination headers attached to an information packet during the tunneling operation by using either a decapsulation/encapsulation or a forwarding operation with the encapsulated information packet. Either of these operations reduces the overhead incurred in the multiple encapsulation headers by reducing encapsulation of the information packet to a single level. Upon receipt of the information packet at the foreign agent on the communications system, the information packet is directed to the mobile node using a routing chain table maintained by the foreign agent or a next hop routing table maintained by the foreign agent and each mobile foreign agent in the transmission path. Once implemented, these data structures can also assist with routing of information packets within the foreign subnetwork.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: June 3, 2003
    Assignee: Nortel Networks Limited
    Inventors: Mohamed Khalil, Emad A. Qaddoura, Haseeb Akhtar, Russell C. Coffin, Liem Q. Le, Krish Pillai