Patents by Inventor Chih Tsien

Chih Tsien 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: 20060214837
    Abstract: A managing wireless communication device assigns channels of a channel set to associated wireless communication devices. The associated wireless communication devices monitor the assigned channels for in-band signals including radar signals and report detections to the managing wireless communication device. The managing wireless communication device resets a timer associated with a channel when a report is received from one of the associated wireless communication devices. The timer may indicate how long the associated channel has been radar free.
    Type: Application
    Filed: March 24, 2005
    Publication date: September 28, 2006
    Inventors: Jiewen Liu, Chih Tsien
  • Publication number: 20060082489
    Abstract: In a wireless network that uses some of the same channels as radars, an operationally separate radar detection device may be used to detect the presence of a radar signal, and notify at leas one network device of that detection so the wireless network devices may switch to a non-interfering channel. In some embodiments the detection device may be physically separate from other network devices, and may notify them via network communication messages. In other embodiments, the detection device may be physically and electrically attached to a network device, and may notify that device via an interrupt or other wired connection.
    Type: Application
    Filed: October 15, 2004
    Publication date: April 20, 2006
    Inventors: Jiewen Liu, Chih Tsien
  • Publication number: 20050265288
    Abstract: Briefly, in accordance with one embodiment of the invention, an apparatus, comprising at least one access point (AP) in a wireless network; and the access point (AP) capable of channel allocation based on predetermined criteria. The wireless network may be a wireless local area network (WLAN) and the channel allocation may be automatic and the predetermined criteria may be allocating a channel which minimizes the interferences among other APs in the network by selecting a channel in the wireless network which has the lowest signal strength level, and/or has less interferences from neighboring cells and/or has an appropriate allocation with spectrum spreading uniformly over the frequency band.
    Type: Application
    Filed: May 27, 2004
    Publication date: December 1, 2005
    Inventors: Jiewen Liu, Chih Tsien
  • Publication number: 20050221869
    Abstract: A mobile station in a wireless network dynamically adjusts its sleeping time for power saving based on its data traffic activity.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 6, 2005
    Inventors: Jiewen Liu, Chih Tsien
  • Publication number: 20050215266
    Abstract: A central controller provides centralized dynamic frequency selection in a wireless network.
    Type: Application
    Filed: March 26, 2004
    Publication date: September 29, 2005
    Inventors: Chih Tsien, Jiewen Liu
  • Publication number: 20050215263
    Abstract: A method includes monitoring a variable-rate data communication channel to determine its signal-to-noise ratio, and adjusting the data transmission rate of the variable rate data communication channel based on its signal-to-noise ratio.
    Type: Application
    Filed: May 12, 2005
    Publication date: September 29, 2005
    Inventors: Chih Tsien, Jiewen Liu
  • Publication number: 20050213532
    Abstract: An access point in a wireless network has a variable output power to reduce wireless network interference.
    Type: Application
    Filed: March 29, 2004
    Publication date: September 29, 2005
    Inventors: Jiewen Liu, Chih Tsien
  • Publication number: 20050197147
    Abstract: In a wireless network, transmit power levels may be interactively adjusted to dynamically maintain a desired level of network loading and/or data throughput in a changing network environment.
    Type: Application
    Filed: March 8, 2004
    Publication date: September 8, 2005
    Inventors: Adrian Stephens, Chih Tsien
  • Publication number: 20050128970
    Abstract: A communication station performs closed-loop transmit power control and adjusts its transmit power level based on an access point sensitivity, a path loss and/or a link margin variation. An average received power level of orthogonal frequency-division multiplexed (OFDM) subcarriers of an OFDM channel may be measured at the communication station, and the path loss may be estimated from an access point transmit power level and the measured power level. The communication station may request an access point's transmit power level and link margin from the access point prior to estimating the path loss. The communication station may calculate the access point sensitivity by subtracting the path loss and the access point link margin from the communication station's transmit power level. The link margin variation may be estimated from an access point transmit power variation, an indoor path loss variation, and/or a receiver power measurement error of the communication station.
    Type: Application
    Filed: December 16, 2003
    Publication date: June 16, 2005
    Inventors: Chih Tsien, Jiewen Liu
  • Publication number: 20050037754
    Abstract: Briefly, in accordance with one embodiment of the invention, a mobile unit may detect and connect to a wireless local area network, contemplating worldwide multiband networks and multiple regulatory domains, with a shorter searching time.
    Type: Application
    Filed: August 12, 2003
    Publication date: February 17, 2005
    Inventors: Jiewen Liu, Chih Tsien
  • Publication number: 20050007979
    Abstract: Briefly, in accordance with one embodiment of the invention, a device may dynamically select a frequency on which to communicate on a wireless local area network by determining which channels are available and which are unoccupied, for example using a received signal power level measurement. A linear folding algorithm may be used to select an available channel at a midpoint in a larger gap between occupied channels. In the event there are multiple larger gaps of the same size, the larger gap at the higher frequency may be selected.
    Type: Application
    Filed: July 7, 2003
    Publication date: January 13, 2005
    Inventors: Chih Tsien, Jiewen Liu