Patents Represented by Attorney Kenneth K. Vu
  • Patent number: 8340698
    Abstract: A method for delivering SMS to ATs in a first communication network providing DO and 1x interfaces and for offloading the delivery of the SMS from a second communication network including an MSC, comprising monitoring a DO control channel for pages by an AT and delivering the SMS in SIP to the AT over the DO interface. The method may further comprise tuning the AT to the DO interface and determining whether the AT is SIP registered for using the DO interface. An application server determines whether the AT is SIP registered for using the DO interface. When the DO interface is not available, the SMS may be delivered over the 1x interface and the method further comprises the AT sending a special SMS to an SMS gateway, which causes the application server to remember that the AT is now monitoring the first communication network including a circuit-switched network.
    Type: Grant
    Filed: October 19, 2006
    Date of Patent: December 25, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Ramin Rezaiifar, Bibhu P. Mohanty
  • Patent number: 8200217
    Abstract: A method and apparatus for channel acquisition using a mobile station include obtaining geographic information of at least one wireless communication systems using one or more systems, respectively. The one or more channels are prioritized on a preferred roaming list based on the geographic information, and it is determined whether any of the prioritized one or more channels on the preferred roaming list are also on a most recently used (MRU) list. The mobile station attempts to acquire at least one of the prioritized one or more channels that is also on the MRU list.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: June 12, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Parag Mohan Kanade, Alex K. Tu, Virat Deepak
  • Patent number: 8145132
    Abstract: A method and apparatus for reducing frequency space from code space search is disclosed in a wireless network. The method and apparatus reduces the frequency space without compromising the probability of detection, so that user equipment can expedite system acquisition and reduce power consumption. To reduce the frequency space, the described aspects note that the power spectral density of the WCDMA signal is essentially flat within the channel bandwidth. By capturing in-phase quadrature samples and doing frequency domain analysis of the signal in bandwidth around the center frequency, to the described aspects can eliminate some channels from the WCDMA code space search during frequency scan.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: March 27, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Messay Amerga, Vivek Chawla, Deepali Garg
  • Patent number: 8098780
    Abstract: A rake receiver finger assignor is configured to assign a rake receiver finger to a time offset between identified signal path time offsets in accordance with a concentration of identified signal paths from a transmitter to a rake receiver. In accordance with the exemplary embodiment, a number of identified signal paths having time offsets within a time window are observed to determine the concentration of signal paths identified by a path searcher. If the number of identified signal paths indicates a concentrated distribution of signal paths such as during a fat path condition, at least one rake finger is assigned between at a time offset between two identified signal paths.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: January 17, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Thejaswi Bharadwaj Madapushi Shesha, Brian Dong, Messay Amerga, Chih-Ping Hsu, Parvathanathan Subrahmanya, Xiaoming Zhu
  • Patent number: 8044734
    Abstract: Techniques for mitigating VCO pulling are described. In an aspect, VCO pulling may be mitigated by (i) injecting an oscillator signal, which is a version of a VCO signal from a VCO, into a transmitter and (ii) using coupling paths from the transmitter to the VCO to re-circulate the oscillator signal back to the VCO. In one design, an apparatus includes a VCO and a coupling circuit. The VCO generates a VCO signal at N times a desired output frequency. The coupling circuit receives an oscillator signal generated based on the VCO signal and injects the oscillator signal into a transmitter to mitigate pulling of the frequency of the VCO due to undesired coupling from the transmitter to the VCO. The apparatus may include a phase adjustment circuit that adjusts the phase of the oscillator signal and/or an amplitude adjustment circuit that adjusts the amplitude of the oscillator signal.
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: October 25, 2011
    Assignee: QUALCOMM Incorporated
    Inventor: Mark Vernon Lane
  • Patent number: 8023410
    Abstract: Methods and apparatus for aggregating IP packets over an access link between a wireless access router and a core node and for managing resource allocation to access link packet aggregates, e.g., as a function of the status of wireless communications links used to couple mobile nodes to the access router are described. Improved aggregate resource control messages and use of such messages are described. Some of the new messages allow aggregate resources for both upstream and downstream aggregates to be controlled in a single message. A single message may include information corresponding to multiple aggregates and/or multiple constituent flows included in an aggregate with aggregate direction information being included. Use of tunnels to communicate management messages, e.g., messages used to control resource allocation to aggregates is also described. Propagation of access link aggregate information is communicated to tunnel end nodes which generate packets that are communicated over the access link.
    Type: Grant
    Filed: December 30, 2005
    Date of Patent: September 20, 2011
    Assignee: Qualcomm Incorporated
    Inventor: Alan O'Neill
  • Patent number: 8018833
    Abstract: A method and system for adapting an effective spreading sequence in a wire-line or a wireless communication system using direct sequence spreading system is described. A station of the communication system determines a state of a communication channel, represented by, e.g., an impulse response, a step response, or any other characteristic known to one skilled in the art. The station determines the channel state by measurements of a received signal or by receiving a feedback signal comprising an information enabling the station to determine the plurality of linearly related phases The station then determines a plurality of linearly related phases in accordance with the state of the communication channel, and then applies at least one of the plurality of linearly related phases to at least one sample of the effective spreading sequence.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: September 13, 2011
    Assignee: Qualcomm Incorporated
    Inventor: Hans Dieter Schotten
  • Patent number: 7999625
    Abstract: A method of calibrating oscillators is disclosed that includes searching, in an array storing an operational characteristic of the oscillator, for an index value that is associated with an output of the oscillator; determining that the output is within a predetermined accuracy as compared to a desired output; and generating the output based the index value. An apparatus for performing the method is also disclosed herein.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: August 16, 2011
    Assignee: QUALCOMM, Incorporated
    Inventor: Koushik Krishnan
  • Patent number: 7965688
    Abstract: The invention is a method for limiting the peak transmit power in a CDMA communication system. At least one of first and second high transmit power regions are separated into a plurality of high transmit power subregions. The high transmit power subregions of the plurality of high subregions are shifted by time offsets of differing durations to provide a plurality of time offset subregions. First and second low transmit power regions are also provided. At least one of the first and second low transmit power regions is also separated into a plurality of transmit power subregions and the low transmit power subregions are shifted by time offsets of differing time durations. The subregions can be time offset by a predetermined time duration or by a random time duration.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: June 21, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Stein A. Lundby, Edward G. Tiedemann, Jr., Jack M. Holtzman, Daisuke Terasawa
  • Patent number: 7953424
    Abstract: A system and method of improving wireless communications between a wireless communication device and both a first network supporting voice and data services and a second network supporting packet data services. The method comprises providing the WCD with a primary transceiver and a secondary receiver for conducting wireless communications in both a simultaneous-mode and a hybrid-mode; performing simultaneous-mode-to-hybrid-mode and hybrid-mode-to-simultaneous-mode transitions based on a performance metric; and evaluating the performance metric to determine whether to perform the mode transitions. In the simultaneous-mode, the primary transceiver conducts wireless communications in the second network and the secondary receiver conducts wireless communications in the first network. In the hybrid-mode, the primary transceiver use is time multiplexed during all of the first and second networks communications combinations.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: May 31, 2011
    Assignee: Qualcomm Incorporated
    Inventors: Simon Turner, Abhay Arvind Joshi, Arthur James Neufeld, Serguei A. Glazko, Steven C. Ciccarelli, Gregory Robert Lie
  • Patent number: 7933256
    Abstract: A method for midamble estimation comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols that comprises a first midamble symbol, calculating, for each symbol in the subset, a corresponding midamble estimation error, and determining the lowest calculated midamble estimation error to locate the first midamble symbol. A receiver comprises an antenna configured to receive a burst of symbols, a timing estimator configured to select a subset of the burst of symbols that comprises a first midamble symbol, a midamble estimator configured to calculate, for each symbol in the subset, a corresponding midamble estimation error, and a processor configured to select the symbol in the subset corresponding to a lowest calculated midamble estimation error as the first midamble symbol.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: April 26, 2011
    Assignee: Qualcomm Incorporated
    Inventors: Farrokh Abrishamkar, Divaydeep Sikri
  • Patent number: 7903770
    Abstract: Techniques for canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence to provide the estimated pilot interference. The pilot interference estimates due to all interfering multipaths are combined to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: March 8, 2011
    Assignee: Qualcomm Incorporated
    Inventors: Jeffrey A. Levin, Thomas B. Wilborn, Brian K. Butler, Paul E. Bender
  • Patent number: 7738906
    Abstract: An apparatus and a method for a control channel power allocation in a communication system are disclosed. The method of control channel power allocation in an embodiment includes sorting a plurality of access terminals in an order of increasing required medium access control (MAC) channel power into a plurality of bins, sorting the access terminals with equal required MAC channel power in an order of decreasing forward link signal to interference and noise ratio (FL_SINR) if two or more access terminals have equal required MAC channel power, and determining total available ARQ power based upon total MAC channel power, total power allocated to reverse power control (RPC) channels, and total power allocated to reverse activity bit (RAB) channels.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: June 15, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Rashid Ahmed Attar, Naga Bhushan, Mingxi Fan
  • Patent number: 7702001
    Abstract: In an antenna diversity environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-negligible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time tracking loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different timing offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: April 20, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Roland Reinhard Rick, Parvathanathan Subrahmanya, Brian K. Butler, Shimman Patel, Thunyachate Ekvetchavit
  • Patent number: 7660245
    Abstract: In a packet communications system stream data is transported over a channel over which packet loss or corruption is possible, with forward error correction (“FEC”) information. A transmitter receives source packets comprising source data, generates FEC source packets formatted to allow for identification of lost or corrupted source packets at a receiver, arranges source data from the source packets into a plurality of source symbols wherein at least one source packet is arranged into more than one source symbol, associates a plurality of source symbols with a source block, generates a plurality of repair symbols from the source block according to a predetermined FEC encoding process and groups the plurality of repair symbols into one or more FEC repair packets associated with the source block. A receiver can use the FEC repair symbols from the FEC repair packets to recover source symbols, as needed.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: February 9, 2010
    Assignee: QUALCOMM Incorporated
    Inventor: Michael Luby
  • Patent number: 7653149
    Abstract: A system and method for dynamically varying traffic channel sectorization within a spread spectrum communication system is disclosed herein. In a preferred implementation the system is operative to convey information to at least one specified user in a spread spectrum communication system and includes multiple antennas, each having an associated coverage area, and each coupled to an antenna driver. The antenna drivers each include a delay element and an input summation node. A switching transmission network is disposed to selectively transmit via antennas. Selective transmission of signals results in variation in size of a given user sector. In another aspect, the system may be configured to selectively receive, and coherently combine, signals from different coverage areas.
    Type: Grant
    Filed: December 17, 2001
    Date of Patent: January 26, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: W. Eli Strich, James H. Thompson
  • Patent number: 7631240
    Abstract: Circuits, methods, and apparatus that reduce overhead and channel bandwidth required for data reception acknowledgment. One such system uses an enhanced block acknowledgment that acknowledges frames received for different data streams. Another system sends an acknowledgment after the occurrence of a triggering event, such as the end of a duration, the reception of a number of frames, or the reception of a frame having a specific sequence number. Another removes the need for acknowledgment frames by including an acknowledgment field in a transmitted data frame. These block acknowledgments and acknowledgment fields may include an acknowledgement of frames received for each data stream having different traffic identifications, they may be for all received frames or for a specific class or groups of classes of traffic, for specific user priorities, or for other subgroups of received frames, and more that one acknowledgment may be included.
    Type: Grant
    Filed: March 7, 2006
    Date of Patent: December 8, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Guido Robert Frederiks, Vincent K. Jones, Alireza Raissinia
  • Patent number: 7630339
    Abstract: Methods and apparatus for providing channel diversity to wireless terminals (WTs) in a manner that reduces the latency between the time a WT encounters satisfactory channel conditions are described. A plurality of communications channels with different physical characteristics are maintained in a cell by a base station (BS). Each WT monitors multiple channels and maintains multiple channel estimates at the same time so that rapid switching between channels is possible. Channel quality information is conveyed from each WT to the BS. The WT or BS selects a channel based on the measured channel quality. By supporting multiple channels and by introducing periodic variations into the channels in various embodiments, the time before a WT encounters a channel with good or acceptable channel conditions is minimized even if the WT does not change location. Multiple antennas are used at the BS to support numerous channels simultaneously, e.g., by controlling antenna patterns.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: December 8, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Rajiv Laroia, Junyi Li, Sundeep Rangan, Murari Srinivasan
  • Patent number: 7623566
    Abstract: Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal.
    Type: Grant
    Filed: January 17, 2007
    Date of Patent: November 24, 2009
    Assignee: Qualcomm Incorporated
    Inventors: Douglas Neal Rowitch, Way-Shing Lee, Thunyachate Ekvetchavit
  • Patent number: 7623590
    Abstract: The present invention concerns a diversity transmitter, comprising: transmit symbol input means (1) for inputting a symbol matrix (b) to be forwarded to a transmit processing means (2), said transmit processing means comprising supplying means (2a) for supplying columns of said symbol to a plurality of at least two branches, each branch being supplied to a respective one of spatial channels (A1, . . . , Am) for transmission to a receiver, a parallelization means (2b) adapted to provide within each branch at least two parallel channels allocated to a respective user, and weighting means (2c) adapted to subject the symbol signals on at least one of said branches to an invertible linear transformation with a fixed complex weight, the complex weight being different for at least two parallel channels. The present invention also concerns a corresponding diversity transmission method.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: November 24, 2009
    Assignee: QUALCOMM Incorporated
    Inventor: Ari Hottinen