Patents by Inventor Mooi Chuah

Mooi Chuah 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).

  • Publication number: 20050259643
    Abstract: An advance over the prior art is achieved through an efficient method to retransmit erroneous frames by identifying the users who are most likely to experience a frame error and requests retransmissions from them. Since the recovery is done by starting with the most likely, second most likely etc., the invention results in faster recovery of data. Moreover, the invention reduces the battery consumption of subsequent mobile nodes by suppressing the retransmission requests that were already made by nodes preceding it. A key element of the invention is to rank the set of receiver nodes in the order of decreasingly worse channel conditions, i.e., from worst to best. Hence, with K receiver nodes, a transmit node assigns rank 1 to a receiver node to which it has the poorest radio channel condition. Similarly, it assigns rank K to the receiver node to which it has the best radio channel condition.
    Type: Application
    Filed: March 31, 2003
    Publication date: November 24, 2005
    Inventors: Mooi Chuah, Kameswara Medapalli
  • Publication number: 20050117530
    Abstract: A clustering based load adaptive sleeping protocol for ad hoc networks includes a plurality of nodes forming a cluster, where the nodes in the cluster are partitioned into n groups. This partitioning is performed based on the node ID (e.g. node_id modulo n). The cluster head transmits a beacon at fixed intervals. The beacon interval is divided into N slots, where N is a multiple of n. Node sleep/activation times are synchronized to the beacon interval slots. The node's group number is used to determine the slots within a beacon interval that a node begins it s sleep cycle. Therefore, no additional signaling is required between nodes to indicate sleep patterns. The sleeping time of each node may be increased when extended periods of inactivity are detected according to an adaptive procedure.
    Type: Application
    Filed: November 6, 2003
    Publication date: June 2, 2005
    Inventors: Santosh Abraham, Mooi Chuah
  • Publication number: 20050117914
    Abstract: Method and apparatus for routing messages in a network includes first filters to provide frequency-based message signals converted from an optically-based signal and mixers adapted to mix the frequency-based message signals with sub-carriers to generate frequency-based sub-carrier modulated message signals. A frequency generator connected to the mixers provides the sub-carriers to the mixers and a combiner connected to the mixers combines the frequency-based sub-carrier modulated message signals. Second filters connected to the combiner receive and group the frequency-based sub-carrier modulated message signals. Optical transmitters connected to second filters optically convert and transmit the frequency-based sub-carrier modulated message signals. The frequency generator generates and applies a particular sub-carrier frequency to one of the mixers according to information contained in the frequency-based message signal.
    Type: Application
    Filed: December 1, 2003
    Publication date: June 2, 2005
    Inventors: Mooi Chuah, Randy Giles, Xiang Liu, Muhammad Qureshi
  • Publication number: 20050111367
    Abstract: In a network including a centralized controller and a plurality of routers forming a security perimeter, a method for selectively discarding packets during a distributed denial-of-service (DDoS) attack over the network. The method includes aggregating victim destination prefix lists and attack statistics associated with incoming packets received from the plurality of routers to confirm a DDoS attack victim, and aggregating packet attribute distribution frequencies for incoming victim related packets received from the plurality of security perimeter routers. Common scorebooks are generated from the aggregated packet attribute distribution frequencies and nominal traffic profiles, and local cumulative distribution function (CDF) of the local scores derived from the plurality of security perimeter routers are aggregated.
    Type: Application
    Filed: November 26, 2003
    Publication date: May 26, 2005
    Inventors: Hung-Hsiang Jonathan Chao, Mooi Chuah, Yoohwan Kim, Wing Lau
  • Publication number: 20050085254
    Abstract: Method for multicasting messages to users of a wireless communication system includes the steps of establishing a power ratio threshold for transmitting the messages, measuring respective power ratios of the users, comparing the established power ratio threshold to the measured power ratios, determining a first subset of the users and a second subset of the users based upon the measured power ratios and delivering the messages to the first subset of the plurality of users via a first transmission scheme. The first transmission scheme delivers the messages to all of the users of the first subset via a broadcast channel. The method also has a step of delivering the messages to the second subset of the users via a second transmission scheme. The second transmission scheme delivers the messages to each of the users of the second subset via respective dedicated channels.
    Type: Application
    Filed: November 26, 2003
    Publication date: April 21, 2005
    Inventors: Mooi Chuah, Wei Luo
  • Publication number: 20050059396
    Abstract: A communications protocol in a computer readable medium of a general purpose computer system that operates as a special purpose controller when executing at least one program for broadcasting information. The communications protocol includes an access point location, an access point Internet protocol (IP) address, a media access control (MAC) address, a number of access point radios, and a radio type protocol of each access point radio.
    Type: Application
    Filed: September 9, 2003
    Publication date: March 17, 2005
    Inventors: Mooi Chuah, Girish Rai
  • Publication number: 20050048983
    Abstract: An advance over the prior art is achieved through an efficient method for an admission control algorithm and a scheduling mechanism that complement each other in providing the following three classes of service. A first class of service is termed Class 1 where users specify a nominal amount of bandwidth desired. A second, lower tier service class is termed Class 2, wherein users specify a nominal and minimum amount of bandwidth desired when entering into a network connection. A third server class is Class 3, where Class 3 users are treated as best effort users. For Class 1 users the methodology of the present invention provides a guaranteed nominal amount of bandwidth. The admission control procedure ensures that Class 1 users are admitted only if resources exist to satisfy the nominal bandwidth requirements of the Class 1 users. Class 2 users are admitted if resources exist to satisfy the minimum bandwidth requirements of the user.
    Type: Application
    Filed: August 29, 2003
    Publication date: March 3, 2005
    Inventors: Santosh Abraham, Mooi Chuah, Tao Liu
  • Patent number: 6675208
    Abstract: A coupled data network with a system for registering end systems is disclosed. A foreign network includes a foreign mobile switching center and a foreign base station. The foreign mobile switching center includes a serving registration server, the foreign base station includes a foreign access hub, and the foreign access hub includes a proxy registration agent. A home network includes a home mobile switching center with a home registration server. A first end system subscribes to the home network and operates within the foreign network. The end system includes an end registration agent, the end registration agent being coupled to the proxy registration agent, the proxy registration agent being coupled to the serving registration server, and the serving registration server being coupled to the home registration server.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: January 6, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Girish Rai, Philip M. Parsons, Mooi Chuah
  • Patent number: 6665718
    Abstract: A wireless data network includes a wireless packet switched data network for end users that divides mobility management into local, micro, macro and global connection handover categories and minimizes handoff updates according to the handover category. The network integrates MAC handoff messages with network handoff messages. The network separately directs registration functions to a registration server and direct routing functions to inter-working function units. The network provides an intermediate XTunnel channel between a wireless hub (also called access hub AH) and an inter-working function unit (IWF unit) in a foreign network, and it provides an IXTunnel channel between an inter-working function unit in a foreign network and an inter-working function unit in a home network. The network enhances the layer two tunneling protocol (L2TP) to support a mobile end system, and it performs network layer registration before the start of a PPP communication session.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: December 16, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Mooi Chuah, Girish Rai
  • Patent number: 6577643
    Abstract: A Message and communication system in a coupled data network is disclosed. The coupled data network includes a foreign network and a home network. The foreign network includes a foreign base station with a foreign access hub, the foreign access hub including a first serving inter-working function. The home network includes a first home inter-working function. A first mobile end system is a subscriber to the home network and operates within the foreign network. A first message is transportable between the first mobile end system and a first communications server through the first home inter-working function and through the first serving inter-working function of the foreign access hub in the foreign base station.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: June 10, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Girish Rai, Philip M. Parsons, Mooi Chuah
  • Patent number: 6421714
    Abstract: A wireless data network that provides communications with a Point-to-Point Protocol (PPP) server is disclosed. A home network includes a home mobile switching center and a wireless end system, the home mobile switching center including a home registration server and a home inter-working function, the wireless end system including an end registration agent, the end registration agent being coupled to the home registration server. The wireless data network also includes a PPP server, wherein a message is coupleable from the end system through the home inter-working function to the PPP server.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: July 16, 2002
    Assignee: Lucent Technologies
    Inventors: Girish Rai, Philip M. Parsons, Mooi Chuah
  • Patent number: 6414950
    Abstract: A coupled data network which ensures in sequence delivery of messages is disclosed. The copuled data network includes a foreign network and a home network. The foreign network includes a foreign mobile switching center and a base station, the base station including an access hub with a serving inter-working function. The home network includes a home mobile switching center, the home mobile switching center including a home inter-working function. A roaming end system is a subscriber to the home network and operates within the foreign network, a message being transportable between the roaming end system and the home inter-working function through the serving inter-working function using a protocol that ensures in sequence delivery of data packets.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: July 2, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Girish Rai, Philip M. Parsons, Mooi Chuah
  • Patent number: 6400722
    Abstract: A wireless data network includes a wireless packet switched data network for end users that divides mobility management into local, micro, macro and global connection handover categories and minimizes handoff updates according to the handover category. The network integrates MAC handoff messages with network handoff messages. The network separately directs registration functions to a registration server and direct routing functions to inter-working function units. The network provides an intermediate XTunnel channel between a wireless hub (also called access hub AH) and an inter-working function unit (IWF unit) in a foreign network, and it provides an IXTunnel channel between an inter-working function unit in a foreign network and an inter-working function unit in a home network. The network enhances the layer two tunneling protocol (L2TP) to support a mobile end system, and it performs network layer registration before the start of a PPP communication session.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: June 4, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Mooi Chuah, Girish Rai
  • Patent number: 6393482
    Abstract: An inter-working function selection system in a coupled data network is disclosed. The coupled data network includes a foreign network and a home network. The foreign network includes a foreign mobile switching center with a serving registration server. The home network includes a home mobile switching center with a home registration server and a plurality of unassigned home inter-working functions. A first end system is a subscriber to the home network and operates within the foreign network. The first end system includes an end registration agent to form a registration request, the end registration agent sending the registration request through the serving registration server to the home registration server, the home registration server including a module to select an active home inter-working function from the plurality of unassigned home inter-working functions based on the registration request.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: May 21, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Girish Rai, Philip M. Parsons, Mooi Chuah
  • Patent number: 6377982
    Abstract: A coupled data network with an accounting system is disclosed. The coupled data network includes a foreign network and a home network. The foreign network includes a base station with an access hub and a foreign mobile switching center with a serving registration server, the access hub including a serving inter-working function, the serving inter-working function including a foreign accounting collection module. The home network includes a home mobile switching center with a home inter-working function, the home inter-working function including a home accounting collection module. An end system is a subscriber to the wireless data network and coupleable to the foreign access hub. The home and serving accounting collection modules collect accounting data on message traffic transported between the end system and a communications server through the home inter-working function and through the serving inter-working function.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: April 23, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Girish Rai, Philip M. Parsons, Mooi Chuah