Patents by Inventor Yu-Cheun Jou

Yu-Cheun Jou 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: 6853843
    Abstract: The present invention is directed to a digital wireless telecommunications system that includes a plurality of base station of differing spectral capabilities, and a plurality of remote stations capable of transmitting data to and receiving transmissions from the plurality of base stations. The invention herein provides a method for remote station hand-off between base stations of a narrower spectral capacity and base stations of a wider spectral capacity. A method is provided for a wireless telecommunications infrastructure to facilitate a remote station hand-off from a set of narrowband compliant base stations to at least one wideband compliant base station while a remote station is in the coverage area of both types of base stations. Additionally, the invention herein provides remote station apparatus, base station apparatus, and base station controller apparatus for performing the handoff methodology of the present invention.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: February 8, 2005
    Assignee: Qualcomm Incorporated
    Inventors: Tao Chen, Yu-Cheun Jou
  • Publication number: 20050007977
    Abstract: A method and apparatus for transmitting broadcast information in a multi-carrier communication system. The Sync Channel of the multi-carrier system is transmitted a 1.25 MHz channel bandwidth (i.e., over a single carrier), and to specify the preferred channels for the Sync Channel transmission instead of the preferred channels for the entire multi-carrier system. The Sync Channel Message will carry additional information indicating the center frequency of a multi-carrier system within a reserved set of frequency bands and indicating the frequency of a single carrier system in the reserved set of frequency bands. Considering the A block of the PCS band again, the preferred channels for Sync Channel transmission can be selected as channels 75, 150 and 225. This selection ensures that one of the preferred channels will always be used by any multi-carrier system regardless of the location of its center channel.
    Type: Application
    Filed: June 28, 2004
    Publication date: January 13, 2005
    Inventor: Yu-Cheun Jou
  • Patent number: 6842477
    Abstract: A novel and improved method for implementing a high-transmission-rate over-the-air interface is described. A transmit system provides an in-phase channel set and a quadrature-phase channel set. The in-phase channel set is used to provide a complete set of orthogonal medium rate control and traffic channels. The quadrature-phase channel set is used to provide a high-rate supplemental channel and an extended set of medium rate channels that are orthogonal to each other and the original medium rate channels. The high-rate supplemental channel is generated over a set of medium rate channels using a short channel code. The medium rate channel is generated using a set of long channel codes.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: January 11, 2005
    Assignee: Qualcomm Incorporated
    Inventors: Joseph P. Odenwalder, Franklin P. Antonio, Edward G. Tiedemann, Jr., Yu-Cheun Jou
  • Publication number: 20040252724
    Abstract: A method and apparatus for transmitting broadcast information in a multi-carrier communication system. The Sync Channel of the multi-carrier system is transmitted a 1.25 MHz channel bandwidth (i.e., over a single carrier), and to specify the preferred channels for the Sync Channel transmission instead of the preferred channels for the entire multi-carrier system. The Sync Channel Message will carry additional information indicating the center frequency of a multi-carrier system within a reserved set of frequency bands and indicating the frequency of a single carrier system in the reserved set of frequency bands. Considering the A block of the PCS band again, the preferred channels for Sync Channel transmission can be selected as channels 75, 150 and 225. This selection ensures that one of the preferred channels will always be used by any multi-carrier system regardless of the location of its center channel.
    Type: Application
    Filed: June 28, 2004
    Publication date: December 16, 2004
    Inventor: Yu-Cheun Jou
  • Publication number: 20040233890
    Abstract: A method and apparatus for transmitting broadcast information in a multi-carrier communication system. The Sync Channel of the multi-carrier system is transmitted a 1.25 MHz channel bandwidth (i.e., over a single carrier), and to specify the preferred channels for the Sync Channel transmission instead of the preferred channels for the entire multi-carrier system. The Sync Channel Message will carry additional information indicating the center frequency of a multi-carrier system within a reserved set of frequency bands and indicating the frequency of a single carrier system in the reserved set of frequency bands. Considering the A block of the PCS band again, the preferred channels for Sync Channel transmission can be selected as channels 75, 150 and 225. This selection ensures that one of the preferred channels will always be used by any multi-carrier system regardless of the location of its center channel.
    Type: Application
    Filed: June 28, 2004
    Publication date: November 25, 2004
    Inventor: Yu-Cheun Jou
  • Patent number: 6823192
    Abstract: Method and apparatus for pseudo-synchronized paging to a mobile station in a wireless communication system. A number of paging repetitions is assigned, wherein a quick page message is repeatedly sent to a target mobile station for the number of paging repetitions. The number of paging repetitions is part of a paging instruction from a base station controller to a base station. The pseudo-synchronized method is used when the target mobile station is soft handoff.
    Type: Grant
    Filed: August 1, 2001
    Date of Patent: November 23, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Yu-Cheun Jou, Jun Wang
  • Publication number: 20040224707
    Abstract: A system for accessing broadcast SMS messages over a wireless communication system. A base station transmits SMS messages periodically and aperiodically over a broadcast channel. The base station allocates periodic slots in the broadcast channel for each of the subscriber services providing the SMS messages and transmits slot parameters to mobile units. Using the slot parameter information, the mobile units periodically wake up to scan the broadcast channel. The period for each category of broadcast SMS messages may be different and the period may apply to a single broadcast channel. Messages arriving aperiodically can be queued and transmitted in pre-scheduled broadcast channel frames. Messages with inter-arrival interval greater than the specified transmission period are simply repeated.
    Type: Application
    Filed: June 10, 2004
    Publication date: November 11, 2004
    Inventor: Yu-Cheun Jou
  • Patent number: 6782277
    Abstract: A method and apparatus for wireless communications wherein a base station transmits a signal to sending data to a subscriber station through a signal beam that sweeps through the coverage area of the base station. User data addressed to the subscriber station is buffered until the signal beam angle of the signal beam allows efficient transmission. The base station may alter the beam sweep speed or the shape of the beam's radiation pattern over time to maximize system efficiency and capacity.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: August 24, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Tao Chen, Fuyun Ling, Jack Holtzman, Yu-Cheun Jou, Stein A. Lundby
  • Publication number: 20040162099
    Abstract: Systems and methods for controlling the power level for a mobile station during periods when no data is being transmitted by the mobile station. In one embodiment, data is intermittently transmitted from a mobile station to a base station on a reverse-link traffic channel. When data is being transmitted on the traffic channel, the transmitted data is used by the base station to perform power control operations (e.g., incrementing or decrementing the mobile station's power level, based upon comparison of a received SNR to a target SNR). When no data is being transmitted on the traffic channel, a “zero-rate indicator” is transmitted on the rate indicator channel. The zero-rate indicator is used by the base station to perform power control. Power control based on the zero-rate indicator may use velocity profiles, reliability metrics or other techniques to control adjustment of the power level.
    Type: Application
    Filed: August 29, 2003
    Publication date: August 19, 2004
    Inventors: Tao Chen, Stein Lundby, Sandip Sarkar, Yu-Cheun Jou
  • Patent number: 6760584
    Abstract: A system for accessing broadcast SMS messages over a wireless communication system. A base station transmits SMS messages periodically and aperiodically over a broadcast channel. The base station allocates periodic slots in the broadcast channel for each of the subscriber services providing the SMS messages and transmits slot parameters to mobile units. Using the slot parameter information, the mobile units periodically wake up to scan the broadcast channel. The period for each category of broadcast SMS messages may be different and the period may apply to a single broadcast channel. Messages arriving aperiodically can be queued and transmitted in pre-scheduled broadcast channel frames. Messages with inter-arrival interval greater than the specified transmission period are simply repeated.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: July 6, 2004
    Assignee: Qualcomm, Incorporated
    Inventor: Yu-Cheun Jou
  • Patent number: 6728230
    Abstract: Demodulation of a received high rate CDMA wireless signal is obtained by filtering a complex received signal to provide a complex pilot filter signal. The complex pilot filter signal is then use to phase-adjust a set of demodulated subscriber channel signals.
    Type: Grant
    Filed: January 8, 2003
    Date of Patent: April 27, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Joseph P. Odenwalder, Yu-Cheun Jou, Edward G. Tiedemann, Jr.
  • Patent number: 6728538
    Abstract: A method and apparatus for generating an autonomous Pilot Strength Measurement Message (PSMM) by a mobile station traveling in a multi-carrier wireless communication system. In a multi-carrier system, the mobile station receives the pilot channel of a base station on multiple carrier frequencies simultaneously. Fading may vary from carrier frequency to carrier frequency. New pilot strength definitions are used by the mobile station in a set of rules transmitted by the base station. The set of rules determines autonomous generation and transmission of PSMMs by the mobile station upon detection of pilots.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: April 27, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Yu-Cheun Jou, Jun Wang, Ramin Rezaiifar, Baaziz Achour, Tao Chen
  • Patent number: 6687285
    Abstract: A mobile station operating in the slotted mode, while monitoring the Quick Paging Channel, monitors the Paging Channel in its assigned slot at least once every N minutes, regardless of what the Quick Paging Channel indicates for that slot. The mobile station shall keep a counter for the number of false alarms that have occurred and another counter for the number misses that have occurred. The count of accumulated false alarms (QPCH_FA) and the count of accumulated misses (QPCH_MISS) are stored by the mobile station and will be sent to the base station when so requested. These two counters can be reset at powering-up or by the base station via messaging, or both. When the number of accumulated misses in a given time interval T1 exceeds a certain threshold Nm1, the mobile station may send a message to inform the base station of this.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: February 3, 2004
    Assignee: Qualcomm Incorporated
    Inventor: Yu-Cheun Jou
  • Patent number: 6680727
    Abstract: Techniques for canceling pilot interference in a wireless (e.g., CDMA) communication system. A received signal typically includes a number of signal instances (i.e., multipaths). For each multipath desired to be processed, the other multipaths act as interference on the desired multipath. If the pilot is generated based on a known data pattern (e.g., all zeros) and covered with a known channelization code (e.g., a Walsh code of zero), then the pilot in an interfering multipath may be estimated as the spreading sequence at a time offset corresponding to the arrival time of that multipath. The pilot interference from each interference multipath may be estimated based on the spreading sequence for the interfering multipath and the despreading sequence for the desired multipath. The total pilot interference from a number of interfering multipaths may be subtracted from the data component in the desired multipath to provide pilot-canceled data having improved performance.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: January 20, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Brian K. Butler, Haitao Zhang, Paul E. Bender, Yu-Cheun Jou
  • Publication number: 20030235210
    Abstract: Access to a variable rate multiple access system is controlled based upon a current loading. The current loading level is used to determine a transmission rate set point. The transmission rate set point may include a maximum transmission rate and a transmission probability. The transmission rate set point is passed to the remote unit which may access the system. A remote unit with data to send determines a desired transmission data rate. If the desire transmission data rate is equal to or greater than the maximum transmission data rate, the remote unit transmits at the maximum transmission data rate with a probability equal to the transmission probability.
    Type: Application
    Filed: March 12, 2003
    Publication date: December 25, 2003
    Applicant: Qualcomm, Incorporated
    Inventors: Edward G. Teidemann, Yu-Cheun Jou, Yu-Chuan Lin
  • Publication number: 20030195017
    Abstract: A method and apparatus for wireless communications wherein a base station transmits a signal to sending data to a subscriber station through a signal beam that sweeps through the coverage area of the base station. User data addressed to the subscriber station is buffered until the signal beam angle of the signal beam allows efficient transmission. The base station may alter the beam sweep speed or the shape of the beam's radiation pattern over time to maximize system efficiency and capacity.
    Type: Application
    Filed: June 3, 2003
    Publication date: October 16, 2003
    Inventors: Tao Chen, Fuyun Ling, Jack Holtzman, Yu-Cheun Jou, Stein A. Lundby
  • Publication number: 20030161471
    Abstract: A control channel in a communication system transmits messages in a one or multiple-slot format. To assure consistency of a message, a content quality indicator is included in the message. Because a terminal receiving the message does not know the number of slots comprising the message, the terminal performs blind format determination by testing hypothesis for all slot formats. Unfortunately, the content of certain control messages results in control messages that appear to be valid in a sense that, the computed CRC is equal to the interpreted CRC. Consequently, the mobile station declares a valid control message, and a false-alarm event occurs. Moreover, the same control messages always result in the same false-alarm events. To prevent such repetitive incorrect determination, the content of the message is scrambled by a time-dependent scrambling sequence before transmission. Re-generating the scrambling sequence, and performing inverse to the scrambling then unscrambles the received message.
    Type: Application
    Filed: February 26, 2002
    Publication date: August 28, 2003
    Inventors: Yu-Cheun Jou, Yongbin Wei, Tao Chen
  • Publication number: 20030128680
    Abstract: Demodulation of a received high rate CDMA wireless signal is obtained by filtering a complex received signal to provide a complex pilot filter signal. The complex pilot filter signal is then use to phase-adjust a set of demodulated subscriber channel signals.
    Type: Application
    Filed: January 8, 2003
    Publication date: July 10, 2003
    Inventors: Joseph P. Odenwalder, Yu-Cheun Jou, Edward G. Tiedemann
  • Publication number: 20030125052
    Abstract: A system for accessing broadcast SMS messages over a wireless communication system. A base station transmits SMS messages periodically and aperiodically over a broadcast channel. The base station allocates periodic slots in the broadcast channel for each of the subscriber services providing the SMS messages and transmits slot parameters to mobile units. Using the slot parameter information, the mobile units periodically wake up to scan the broadcast channel. The period for each category of broadcast SMS messages may be different and the period may apply to a single broadcast channel. Messages arriving aperiodically can be queued and transmitted in pre-scheduled broadcast channel frames. Messages with inter-arrival interval greater than the specified transmission period are simply repeated.
    Type: Application
    Filed: November 8, 2002
    Publication date: July 3, 2003
    Applicant: QUALCOMM, Incorporated
    Inventor: Yu-Cheun Jou
  • Publication number: 20030119505
    Abstract: A method and apparatus for generating an autonomous Pilot Strength Measurement Message (PSMM) by a mobile station traveling in a multi-carrier wireless communication system. In a multi-carrier system, the mobile station receives the pilot channel of a base station on multiple carrier frequencies simultaneously. Fading may vary from carrier frequency to carrier frequency. New pilot strength definitions are used by the mobile station in a set of rules transmitted by the base station. The set of rules determines autonomous generation and transmission of PSMMs by the mobile station upon detection of pilots.
    Type: Application
    Filed: February 4, 2003
    Publication date: June 26, 2003
    Applicant: QUALCOMM, Incorporated
    Inventors: Yu-Cheun Jou, Jun Wang, Ramin Rezaiifar, Baaziz Achour, Tao Chen