Patents by Inventor Shawn Tsai

Shawn Tsai 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: 9179402
    Abstract: A method, an apparatus, and a computer program product for wireless communication at a fourth generation (4G) capable user equipment (UE) include determining, when the 4G capable UE does not report a 4G capability but reports one or more other radio access technology (RAT) capabilities, a 4G service change possibility for the 4G capable UE, performing a 4G network search and measurement procedure in response to the determination of the 4G service change possibility, and performing a combined evolved packet system/circuit switched (EPS/CS) attach attempt procedure when the 4G network search and measurement procedure indicates a 4G network availability.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: November 3, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Shiau-He Shawn Tsai, Ta-Yan Siu, Guangming Shi
  • Patent number: 9100949
    Abstract: Mechanisms to interlace multiple legacy frames to enhance radio resource utilization are described. Also described are mechanisms to modify a low-latency frame structure to appear as legacy frames. In one aspect, partially blanked-out legacy frames are interlaced with time offsets so that they complement each other to leave no idle system time. To a legacy user equipment, the interlaced frame appears as normal legacy frames used by multiple legacy cells. In another aspect, the low-latency frame is modified to appear as an interlaced frame. Again to the legacy user equipment, the low-latency frame appears as legacy frames from multiple legacy cells. To the low-latency user equipment, the modified low-latency frame still appear as normal low-latency frame. In this manner, radio resources of the legacy base stations are optimally utilized. Also, low-latency base stations are enabled to provide serves to the legacy user equipments without wasting radio resources.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: August 4, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Shiau-He Shawn Tsai, Per Ernstrom
  • Publication number: 20150029949
    Abstract: A method, an apparatus, and a computer program product for wireless communication at a fourth generation (4G) capable user equipment (UE) include determining, when the 4G capable UE does not report a 4G capability but reports one or more other radio access technology (RAT) capabilities, a 4G service change possibility for the 4G capable UE, performing a 4G network search and measurement procedure in response to the determination of the 4G service change possibility, and performing a combined evolved packet system/circuit switched (EPS/CS) attach attempt procedure when the 4G network search and measurement procedure indicates a 4G network availability.
    Type: Application
    Filed: October 4, 2013
    Publication date: January 29, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Shiau-He Shawn TSAI, Ta-Yan Siu, Guangming Shi
  • Patent number: 8717979
    Abstract: The technology in this application multiplexes transmission associated with multiple users onto the same unsolicited grant service (UGS) radio resource(s) in a packet-based, radio communications system. Normally, the radio resources in a packet-based communications system are dynamically scheduled in response to radio resource requests associated with specific user devices, and the scheduled communications are designed not to use the same radio resource at the same time. However, an unsolicited grant of radio resources for communication between multiple user devices and the packet-based communications system is also established. The communications between those multiple user devices and the packet-based communications system use at least some of the same radio resources associated with the unsolicited grant at the same time.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: May 6, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Shiau-He Shawn Tsai, Jonas L. Wiorek
  • Publication number: 20130294411
    Abstract: Mechanisms to interlace multiple legacy frames to enhance radio resource utilization are described. Also described are mechanisms to modify a low-latency frame structure to appear as legacy frames. In one aspect, partially blanked-out legacy frames are interlaced with time offsets so that they complement each other to leave no idle system time. To a legacy user equipment, the interlaced frame appears as normal legacy frames used by multiple legacy cells. In another aspect, the low-latency frame is modified to appear as an interlaced frame. Again to the legacy user equipment, the low-latency frame appears as legacy frames from multiple legacy cells. To the low-latency user equipment, the modified low-latency frame still appear as normal low-latency frame. In this manner, radio resources of the legacy base stations are optimally utilized. Also, low-latency base stations are enabled to provide serves to the legacy user equipments without wasting radio resources.
    Type: Application
    Filed: July 2, 2013
    Publication date: November 7, 2013
    Inventors: Shiau-He Shawn TSAI, Per Ernstrom
  • Patent number: 8477697
    Abstract: Mechanisms to interlace multiple legacy frames to enhance radio resource utilization are described. Also described are mechanisms to modify a low-latency frame structure to appear as legacy frames. In one aspect, partially blanked-out legacy frames are interlaced with time offsets so that they complement each other to leave no idle system time. To a legacy user equipment, the interlaced frame appears as normal legacy frames used by multiple legacy cells. In another aspect, the low-latency frame is modified to appear as an interlaced frame. Again to the legacy user equipment, the low-latency frame appears as legacy frames from multiple legacy cells. To the low-latency user equipment, the modified low-latency frame still appear as normal low-latency frame. In this manner, radio resources of the legacy base stations are optimally utilized. Also, low-latency base stations are enabled to provide serves to the legacy user equipments without wasting radio resources.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: July 2, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Shiau-He Shawn Tsai, Per Ernström
  • Patent number: 8379777
    Abstract: A symbol sequence contained in a received signal comprising a cyclic convolution of a Walsh code multiplexed signal and a channel impulse response of a multipath channel is detected using Walsh Hadamard domain equalization techniques. The method comprises converting the received signal and the channel impulse response of the multipath channel from the time domain to the WHT domain, and determining the symbol sequence based on equalizing the received signal in the WHT domain using WHT spectra of the channel impulse response to remove inter-symbol interference from the received signal due to cross-correlation between Walsh codes.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: February 19, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Shiau-He Shawn Tsai
  • Patent number: 8375280
    Abstract: A method of generating a set of generator polynomials for use as a tail biting convolution code to operate on data transmitted over a channel comprises: (1) selecting valid combinations of generator polynomials to include in a pool of potential codes, each valid combination being a potential code; (2) determining first lines of a weight spectrum for each potential code in the pool and including potential codes of the pool having best first lines in a candidate set; (3) determining best codes of the candidate set based on the first L number of lines in the weight spectrum; (4) selecting an optimum code(s) from the best codes; and (5) configuring a shift register circuit(s) of a data transceiver to implement the optimum code(s).
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: February 12, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Tsao-Tsen (Jason) Chen, Shiau-He Shawn Tsai, Per Ernström
  • Patent number: 8219896
    Abstract: A decoder is provided which is configured to operate upon an input encoded sequence using a wrap around Viterbi procedure, and a decoding method which employs the decoder. The decoder/method is configured to output a selected path as a decode sequence, and to avoid storing, for a current iteration of the wrap-around Viterbi procedure other than a first iteration, a best path up to the current iteration.
    Type: Grant
    Filed: June 17, 2008
    Date of Patent: July 10, 2012
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Jason Chen, Shiau-He Shawn Tsai
  • Patent number: 8054775
    Abstract: A method of reverse link power control for a reverse packet data channel in a wireless communication system allows a mobile station to autonomously change its data transmission rate. The mobile station transmits packet data over a reverse packet data channel having a data rate variant transmit power level that varies based on a transmit data rate on the packet data channel. The mobile station further transmits control signals over a reverse control channel associated with the reverse packet data channel. The transmit power level of the reverse control channel is such that the transmit power level does not vary with the transmit data rate on the packet data channel. The radio base station measures the strength of the received signals on the reverse control channel, compares the measured strength to a power control set point, and generates a power control signal responsive to the comparison of the control signal to the power control set point.
    Type: Grant
    Filed: October 4, 2007
    Date of Patent: November 8, 2011
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Anthony C. K. Soong, Seong-Jun Oh, Shiau-He Shawn Tsai, Young C. Yoon
  • Publication number: 20110150145
    Abstract: A symbol sequence contained in a received signal comprising a cyclic convolution of a Walsh code multiplexed signal and a channel impulse response of a multipath channel is detected using Walsh Hadamard domain equalization techniques. The method comprises converting the received signal and the channel impulse response of the multipath channel from the time domain to the WHT domain, and determining the symbol sequence based on equalizing the received signal in the WHT domain using WHT spectra of the channel impulse response to remove inter-symbol interference from the received signal due to cross-correlation between Walsh codes.
    Type: Application
    Filed: November 29, 2010
    Publication date: June 23, 2011
    Inventor: Shiau-He Shawn Tsai
  • Patent number: 7895578
    Abstract: A computer readable medium includes executable instructions to allow the designation of a connector component provided within a Graphical User Interface (GUI). The selection of a graphic component within the GUI is supported. The connector component is associated with the graphic component. The connector component is associated with a data source. An interactive control panel incorporating the connector component and the graphic component is generated. The interactive control panel presents data from the data source.
    Type: Grant
    Filed: June 9, 2006
    Date of Patent: February 22, 2011
    Assignee: Business Objects Software Ltd.
    Inventors: Shawn Tsai, Santiago E. Becerra, Jr.
  • Patent number: 7869546
    Abstract: A symbol sequence contained in a received signal comprising a cyclic convolution of a Walsh code multiplexed signal and a channel impulse response of a multipath channel is detected using Walsh Hadamard domain equalization techniques. The method comprises converting the received signal and the channel impulse response of the multipath channel from the time domain to the WHT domain, and determining the symbol sequence based on equalizing the received signal in the WHT domain using WHT spectra of the channel impulse response to remove inter-symbol interference from the received signal due to cross-correlation between Walsh codes.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: January 11, 2011
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Shiau-He Shawn Tsai
  • Patent number: 7840889
    Abstract: A computer-implemented method includes designating selected spreadsheet cells within a spreadsheet document. Spreadsheet function source code characterizing the functionality associated with the selected spreadsheet cells is generated. The spreadsheet function source code is incorporated into a source code application.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: November 23, 2010
    Assignee: Business Objects Software Ltd.
    Inventors: Brian Eric Mantuano, Santiago E. Becerra, Jr., Shawn Tsai, Jesse Calderon
  • Publication number: 20100214969
    Abstract: A base station for use in a WiMAX system comprise means for sending a wake-up signal to an idle terminal to indicate to the terminal that a paging signal is about to be sent to the terminal. The terminal receives and interprets the wake-up signal and prepares itself for receiving the paging signal. This saves battery power in the terminal since the wake-up signal can be detected more easily than the paging signal. The base station, in the mean time, can reduce its paging message traffic and saves overhead in downlink transmission.
    Type: Application
    Filed: May 3, 2007
    Publication date: August 26, 2010
    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Anders Lamm, Stefan Lindgren, Shiau-He Shawn Tsai
  • Patent number: 7738901
    Abstract: A communication transceiver transmits a power-controlled first signal responsive to received power control commands and transmits one or more additional signals at variable power gains relative to the transmit power of the first signal based on reception quality feedback received for the additional signals. Thus, a mobile station may transmit a traffic channel at a variable power gain relative to its pilot signal power and vary that gain responsive to reception quality feedback received by it for the traffic signal. Of course, the mobile station may float more than one traffic channel using variable gains and may use different variable gains for each one. Further, the mobile station may float one or more non-pilot channels relative to the pilot or relative to another channel, while transmitting one or more fixed gain channels. Similar variable power gain may be employed at network base stations for forward link signals.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: June 15, 2010
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Shiau-He Shawn Tsai, Young C. Yoon, Tao Wu, Anthony C. K. Soong
  • Patent number: 7738903
    Abstract: A method and apparatus provide for setting the initial transmit power of secondary reverse link carriers used by mobile stations in conjunction with primary reverse link carriers. In one or more embodiments, a mobile station sets the initial transmit power of a secondary reverse link carrier relative to the transmit power of the primary reverse link carrier as a function of initialization transmit power information transmitted to the mobile station, which directly or indirectly considers reverse link loading information. Additional considerations may include differences in active sets associated with the primary and secondary reverse link carriers and/or sector switching activity of the mobile station.
    Type: Grant
    Filed: March 10, 2006
    Date of Patent: June 15, 2010
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Wanshi Chen, Anthony C. K. Soong, Shiau-He Shawn Tsai, Rath Vannithamby
  • Patent number: 7697948
    Abstract: A method of adapting resource allocation parameters to reach one or more quality targets with improved accuracy is proposed. New information measurements based on the so-called mutual information, preferably at block-level, are introduced. The MI-based information measurements of a previous transmission, the channel prediction of a subsequent transmission and one or more quality requirements, are used to determine the amount and type of resources, e.g. time, frequency and power resources, that are to be used for the subsequent transmission. The resource allocation can for example comprise power allocation and/or link adaptation and the invention enables an advantageous implementation with cooperative link-adaptation and power allocation. The proposed method is useful in connection with ARQ/HARQ retransmissions.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: April 13, 2010
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Lei Wan, Magnus Almgren, Shiau-He Shawn Tsai
  • Publication number: 20090147742
    Abstract: Mechanisms to interlace multiple legacy frames to enhance radio resource utilization are described. Also described are mechanisms to modify a low-latency frame structure to appear as legacy frames. In one aspect, partially blanked-out legacy frames are interlaced with time offsets so that they complement each other to leave no idle system time. To a legacy user equipment, the interlaced frame appears as normal legacy frames used by multiple legacy cells. In another aspect, the low-latency frame is modified to appear as an interlaced frame. Again to the legacy user equipment, the low-latency frame appears as legacy frames from multiple legacy cells. To the low-latency user equipment, the modified low-latency frame still appear as normal low-latency frame. In this manner, radio resources of the legacy base stations are optimally utilized. Also, low-latency base stations are enabled to provide serves to the legacy user equipments without wasting radio resources.
    Type: Application
    Filed: November 11, 2008
    Publication date: June 11, 2009
    Inventors: Shiau-He Shawn TSAI, Per ERNSTROM
  • Publication number: 20090150755
    Abstract: A method of generating a set of generator polynomials for use as a tail biting convolution code to operate on data transmitted over a channel comprises: (1) selecting valid combinations of generator polynomials to include in a pool of potential codes, each valid combination being a potential code; (2) determining first lines of a weight spectrum for each potential code in the pool and including potential codes of the pool having best first lines in a candidate set; (3) determining best codes of the candidate set based on the first L number of lines in the weight spectrum; (4) selecting an optimum code(s) from the best codes; and (5) configuring a shift register circuit(s) of a data transceiver to implement the optimum code(s).
    Type: Application
    Filed: October 29, 2008
    Publication date: June 11, 2009
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Tsao-Tsen (Jason) CHEN, Shiau-He Shawn Tsai, Per Ernstrom