Patents by Inventor Mario Joa-Ng

Mario Joa-Ng 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).

  • Patent number: 7313403
    Abstract: Disclosed are systems and methods which provide for location positioning in wireless networks using techniques which are adapted to provide reliable location determinations even in complex topological environments. Embodiments utilize multiple antenna patterns, such as may be provided using phased array antennas, and implement location positioning techniques which do not require alteration of remote stations in providing location positioning. Various techniques for determining location may be implemented, including a channel model independent approach, a channel model based approach, or combinations thereof. A channel model independent approach used in providing location positioning may compare receive signal strength differences to an antenna gain difference table to determine an angle in the azimuth that a remote station is located.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: December 25, 2007
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Yi Gong, Hang Ching Jason Leung, Mario Joa-Ng, Piu Bill Wong, Soung Chang Liew, Yan Wang
  • Patent number: 7230974
    Abstract: Synchronizing the clocks of nodes or stations in a communications network in a way that is independent of computation and switching time. This may be done by synchronizing pseudo-random noise clocks (found in the nodes of a spread spectrum communication system) or by synchronizing chip sequence clocks (found in the nodes of a CDMA communication system). In this way, the accuracy of synchronization should only be affected by the resolution of a matched filter (i.e., a facility to match or correlate bit sequences) in the node. Once synchronized, these nodes may be used to locate another node or station based on transmission propagation delays determined by the synchronization method.
    Type: Grant
    Filed: May 18, 2000
    Date of Patent: June 12, 2007
    Assignee: Polytechnic University
    Inventors: I-Tai Lu, Mario Joa-Ng
  • Patent number: 6980524
    Abstract: A “peer-to-peer” hierarchical routing protocol—also referred to as Zone-based Hierarchical Link State Routing protocol (or “ZHLS”)—which incorporates location information into a novel “peer-to-peer” hierarchical routing approach. The network may be divided into non-overlapping zones. Aggregating nodes into zones conceals the detail of the network topology. Initially, each node knows its own position and therefore zone ID through a position determination unit, such as a Global Positioning System (GPS). After the network is established, each node knows the low level (node level) topology about node connectivity within its zone and the high level (zone level) topology about zone connectivity of the whole network. A packet may be forwarded by specifying the hierarchical address—zone ID and node ID—of a destination node in the packet header.
    Type: Grant
    Filed: May 22, 2000
    Date of Patent: December 27, 2005
    Assignee: Polytechnic University
    Inventors: I-Tai Lu, Mario Joa-Ng
  • Publication number: 20050032531
    Abstract: Disclosed are systems and methods which provide for location positioning in wireless networks using techniques which are adapted to provide reliable location determinations even in complex topological environments. Embodiments utilize multiple antenna patterns, such as may be provided using phased array antennas, and implement location positioning techniques which do not require alteration of remote stations in providing location positioning. Various techniques for determining location may be implemented, including a channel model independent approach, a channel model based approach, or combinations thereof. A channel model independent approach used in providing location positioning may compare receive signal strength differences to an antenna gain difference table to determine an angle in the azimuth that a remote station is located.
    Type: Application
    Filed: August 6, 2003
    Publication date: February 10, 2005
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Yi Gong, Hang Ching Leung, Mario Joa-Ng, Piu Wong, Soung Liew, Yan Wang
  • Publication number: 20040103311
    Abstract: Secure wireless communications for a mobile host over any wireless interface within a wireless network is provided by a security gateway. The security gateway is situated and configured within the mobile host's home network of the wireless network such that it provides the only point of access between the wireless network and the home network. Additionally, the security gateway is separate and distinct from the mobile host's home agent within the home network. A single tunnel mode security association is established between the mobile host's wireless interface and the security gateway's network interface on the home network. This single tunnel mode security association remains established as the mobile host moves between foreign networks and provides secure wireless communications to the mobile host whether the mobile host is in the home network or the foreign networks.
    Type: Application
    Filed: November 27, 2002
    Publication date: May 27, 2004
    Inventors: Melbourne Barton, Kuok-Shoong Wong, Mario Joa-Ng, Derek Atkins
  • Publication number: 20020167963
    Abstract: Methods and systems are provided for communicating data between nodes in a network. A first and second source nodes each sends a request-to-send (RTS) control packet to a destination node. The first source node transmits its RTS packet to the destination node over a common channel at a randomly selected time t1. The second source node transmits its RTS packet to the destination node over a common channel at a randomly selected time t2. When the destination node receives the RTS packet, the destination node transmits a clear-to-send (CTS) control packet over the common channel. When the destination node is configured to select the first arriving RTS packet and if the RTS packet from the first source node arrives at the destination node before the RTS packet from the second source node, the destination node transmits a CTS control packet over the common channel that corresponds to the RTS packet of the first source node.
    Type: Application
    Filed: March 27, 2002
    Publication date: November 14, 2002
    Inventor: Mario Joa-Ng