Patents by Inventor Jyh-Cheng Chen

Jyh-Cheng Chen 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: 20030142642
    Abstract: The transmission of unnecessary assignment and validation information to mobile terminals in wireless IP networks is automatically blocked. Assignment and validation information originating with a mobile terminal is discarded by a base station if the information is not directly received by the base station from a mobile terminal. Assignment and validation information originating with an IP address server is broadcast only to those mobile terminals awaiting assignment or validation information using a local broadcast IP address. The validation and assignment is automatically begun once a mobile terminal enters a new subnet by resetting the mobile terminal's IP address to the broadcast address for assignment and validation requests and then broadcasting validation and, if necessary, assignment requests to the wireless IP network.
    Type: Application
    Filed: January 31, 2002
    Publication date: July 31, 2003
    Inventors: Prathima Agrawal, Jyh-Cheng Chen, Tao Zhang
  • Patent number: 6570926
    Abstract: Encoding a real-time and non-real-time video stream, encapsulating the encoded video stream along with the decoding software corresponding to the encoding program into active packets at the Application and Services layer, and transmitting active the packets to the receiving terminal, which then supplies the receiver with the necessary decoding software to play any type of encoded video stream without having the associated decoding software pre-loaded.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: May 27, 2003
    Assignee: Telcordia Technologies, Inc.
    Inventors: Prathima Agrawal, Jyh-Cheng Chen
  • Publication number: 20020193114
    Abstract: A technique for assigning an address (“shadow address”) to a mobile station that is compatible with the layer-2 address on the wireline network which serves the mobile station. The shadow address is then used as a wireline identifier for the destination address for frames ultimately destined for the mobile station. The shadow address is stored in a watch list for serving base stations, and any base station receiving a frame with a shadow address in its watch list process the frame to forward it the to mobile station. In this way, the shadow address facilitates carrying out soft handoff and smooth handoff.
    Type: Application
    Filed: October 12, 2001
    Publication date: December 19, 2002
    Inventors: Prathima Agrawal, Jyh-Cheng Chen, Tao Zhang
  • Publication number: 20020191561
    Abstract: A technique for assigning an address (“shadow address”) to a mobile station that is compatible with the layer-2 address on the wireline network which serves the mobile station. The shadow address is then used as a wireline identifier for the destination address for frames ultimately destined for the mobile station. The shadow address is stored in a watch list for serving base stations, and any base station receiving a frame with a shadow address in its watch list process the frame to forward it the to mobile station. In this way, the shadow address facilitates carrying out soft handoff and smooth handoff.
    Type: Application
    Filed: October 12, 2001
    Publication date: December 19, 2002
    Inventors: Jyh-Cheng Chen, Tao Zhang
  • Publication number: 20020193116
    Abstract: A technique for assigning an address (“shadow address”) to a mobile station that is compatible with the layer-2 address on the wireline network which serves the mobile station. The shadow address is then used as a wireline identifier for the destination address for frames ultimately destined for the mobile station. The shadow address is stored in a watch list for serving base stations, and any base station receiving a frame with a shadow address in its watch list process the frame to forward it the to mobile station. In this way, the shadow address facilitates carrying out soft handoff and smooth handoff.
    Type: Application
    Filed: October 12, 2001
    Publication date: December 19, 2002
    Inventors: Prathima Agrawal, Jyh-Cheng Chen, Tao Zhang
  • Publication number: 20020191558
    Abstract: A technique for assigning an address (“shadow address”) to a mobile station that is compatible with the layer-2 address on the wireline network which serves the mobile station. The shadow address is then used as a wireline identifier for the destination address for frames ultimately destined for the mobile station. The shadow address is stored in a watch list for serving base stations, and any base station receiving a frame with a shadow address in its watch list process the frame to forward it the to mobile station. In this way, the shadow address facilitates carrying out soft handoff and smooth handoff.
    Type: Application
    Filed: October 12, 2001
    Publication date: December 19, 2002
    Inventors: Prathima Agrawal, Jyh-Cheng Chen, Tao Zhang
  • Publication number: 20020191560
    Abstract: A technique for assigning an address (“shadow address”) to a mobile station that is compatible with the layer-2 address on the wireline network which serves the mobile station. The shadow address is then used as a wireline identifier for the destination address for frames ultimately destined for the mobile station. The shadow address is stored in a watch list for serving base stations, and any base station receiving a frame with a shadow address in its watch list process the frame to forward it the to mobile station. In this way, the shadow address facilitates carrying out soft handoff and smooth handoff.
    Type: Application
    Filed: October 12, 2001
    Publication date: December 19, 2002
    Inventors: Jyh-Cheng Chen, Tao Zhang
  • Patent number: 6490259
    Abstract: Active packets are utilized by a mobile terminal in a wireless network to manage the micro-mobility which includes both link layer mobility and intra-domain mobility of a wireless connection as the mobile terminal moves from one cell to another in a domain of a network. Active packets convey instructions and data so nodes in the domain may update forwarding tables maintained by each of the devices in the domain. The forwarding table entries contain both link layer entries and network layer entries to efficiently handle roaming by the mobile terminal.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: December 3, 2002
    Assignee: Telcordia Technologies, Inc.
    Inventors: Prathima Agrawal, Jyh-Cheng Chen
  • Patent number: 6480537
    Abstract: Encoding a real-time and non-real-time video stream, encapsulating the encoded video stream along with the decoding software corresponding to the encoding program into active packets at the Application and Services layer, and transmitting active the packets to the receiving terminal, which then supplies the receiver with the necessary decoding software to play any type of encoded video stream without having the associated decoding software pre-loaded.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: November 12, 2002
    Assignee: Telcordia Technologies, Inc.
    Inventors: Prathima Agrawal, Jyh-Cheng Chen, David Famolari
  • Patent number: 6434191
    Abstract: A methodology and concomitant circuitry for adaptively controlling the number of packets and the error-correction applied to each packet in a layered coding communication system. The determination of the number of packets and the error-correction is based upon the bit-error rate of the channel propagating the packets.
    Type: Grant
    Filed: September 1, 2000
    Date of Patent: August 13, 2002
    Assignee: Telcordia Technologies, Inc.
    Inventors: Prathima Agrawal, Jyh-Cheng Chen, Parameswaran Ramanathan
  • Patent number: 6072784
    Abstract: A method adapts scheduling priorities in a CDMA wireless communications system to conserve battery power in mobile terminals operating within the system. A base station, within the system, receives battery power level information and other setup information from mobile terminals operating within the service area of the base station during call setup procedures. Based on the battery power level information and other setup information, the base station adapts scheduling priorities for the mobile terminals to expedite wireless transmissions from those mobile terminals reporting low battery power levels. The base station schedules the transmissions from low battery power mobile stations to be clustered together in a low-power time slot which is separate in time from the scheduled transmissions from high battery power mobile stations.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: June 6, 2000
    Assignee: AT&T Corp.
    Inventors: Prathima Agrawal, Jyh-Cheng Chen, Shalinee Kishore, Krishna M. Sivalingam