Patents Assigned to InterDigital Technology
  • Patent number: 8305956
    Abstract: A method and system for implementing multi-user virtual multiple-input multiple-output (MIMO) techniques for wireless transmit/receive units (WTRUs) having one or more antennas are disclosed. The system includes a base station and at least one WTRU having at least two antennas. The number of antennas of the base station is not less than the number of antennas of any of the WTRUs. The base station generates a channel matrix for the WTRUs and processes received signals from the WTRUs based on a measurement of the channel matrix. The WTRUs may perform transmit precoding or eigen-beamforming using the channel matrix information. The WTRUs may also perform transmit diversity.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: November 6, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Robert Lind Olesen, Donald M. Grieco, Kyle Jung-Lin Pan
  • Patent number: 8306567
    Abstract: A system and a method of controlling transmitter power in a wireless communication system in which user data is processed as a multirate signal in which the user data signal having a first rate is converted into a transmission data signal having a faster second rate for transmission. The transmission power is adjusted on a relatively slow basis based on quality of data received by a receiver of the transmitted data. The transmitter power is determined as a function of the first and second rates such that a change in the data rate in the multiple channels or the rate of the transmission data signal is compensated in advance of a quality of data based adjustment associated with such data rate change.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: November 6, 2012
    Assignee: InterDigital Technology Corporation
    Inventor: John W. Haim
  • Patent number: 8300607
    Abstract: A method for using a wireless digital base station to receive, process and transmit a plurality of communications having independent data rates establishing a first communication channel having a first data communication rate to support a first communication; determining the data rate required to support the first communication; selecting one or more transmission channels, from a plurality of available transmission channels, required to support said required data rate; and transmitting the first communication using one or more selected transmission channels. The plurality of available transmission channels includes at least one B or D channel.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: October 30, 2012
    Assignee: InterDigital Technology Corporation
    Inventor: Fatih M. Ozluturk
  • Patent number: 8301190
    Abstract: A method and apparatus for selecting one of a plurality of multi-band access points (APs) to associate with a multi-band wireless transmit/receive unit (WTRU) are disclosed. The multi-band APs broadcast frequency band information regarding multiple frequency bands on which the multi-band AP is configured to operate. The multi-band WTRU selects a particular multi-band AP to associate with and a frequency band to use to communicate with the selected multi-band AP based on the frequency band information. If the multi-band WTRU receives frequency band information from the selected multi-band AP which indicates that a characteristic, (e.g., throughput, path loss, load, capacity, backhaul), of the selected frequency band is unacceptable, the multi-band WTRU determines whether to disassociate with the selected multi-band AP or to continue to associate with the selected multi-band AP via a different frequency band.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: October 30, 2012
    Assignee: InterDigital Technology Corporation
    Inventor: Arty Chandra
  • Patent number: 8300520
    Abstract: A method and apparatus for interference signal code power noise variance estimation employing a reduced number of samples is disclosed. A recursive technique may be employed wherein the noise variance is estimated from ignored coefficients of the estimated channel output and upgraded recursively.
    Type: Grant
    Filed: February 10, 2009
    Date of Patent: October 30, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Younglok Kim, Kyle Jung-Lin Pan, Ariela Zeira
  • Patent number: 8295246
    Abstract: A method and system for supporting an evolved universal mobile telecommunication systems (UMTS) terrestrial radio access network (E-UTRAN) are disclosed. The system includes a wireless transmit/receive unit (WTRU), a UTRAN and an E-UTRAN. The UTRAN sends to the WTRU a list of available radio access technologies in a coverage area of the UTRAN. The list includes information related to the E-UTRAN. The WTRU receives the list and may initiate a handoff based on the list. The WTRU then sends its multi-mode/multi-RAT capability information including the E-UTRAN capability to the UTRAN. The UTRAN then sends a measurement capability message to the WTRU. The measurement capability message includes parameters necessary for performing measurements on an E-UTRAN channel. The WTRU performs measurements based on the measurement capability message and reports measurement results to the UTRAN. The UTRAN may initiate a handoff to the E-UTRAN based on the measurement results.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: October 23, 2012
    Assignee: InterDigital Technology Corporation
    Inventor: Kamel M. Shaheen
  • Patent number: 8295401
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: October 23, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Robert Lind Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Patent number: 8296619
    Abstract: A method and an apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed. A method and apparatus of performing receive processing to reduce the probability of false acceptance of erroneous PANs are also disclosed. A transmit station generates a PAN check sequence (PCS) and performs a channel coding on a PAN field and the PCS. The transmit station scrambles the encoded bits of the PAN field and the PCS with a TBF-specific scrambling code. Because of the scrambling, the PCS decoding at a receive station will pass if the data block is received by an intended receive station, while the PCS decoding will fail if received by a non-intended receive station. Alternatively, the scrambling may be performed before the channel coding. Alternatively, the transmit station may combine the PAN field and a temporary flow identity (TFI) to generate a PCS.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: October 23, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Yan Li, Stephen G. Dick, Prabhakar R. Chitrapu, Marian Rudolf, Behrouz Aghili, Khushali N. Manseta
  • Patent number: 8295839
    Abstract: A wireless communication method and apparatus for recovering data following a serving cell change are disclosed. A wireless transmit/receive unit (WTRU) includes a status prohibit timer that delays the transmission of normal status reports that indicate the status of data, (i.e., PDUs), that was successfully received and/or not successfully received after a serving cell change status report is sent. A serving radio network controller (SRNC) transmits a sequence of packet data units (PDUs). The status prohibit timer is advanced and the WTRU sends a normal status report to the SRNC without a delay caused by the status prohibit timer. In another embodiment, the WTRU receives a radio link control (RLC) intelligence mode indicator signal that indicates whether a non-intelligent radio network controller (RNC) RLC operation or an intelligent RNC RLC operation is in effect, and the WTRU generates normal status reports based on the indication of the signal.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: October 23, 2012
    Assignee: InterDigital Technology Corporation
    Inventor: Stephen E. Terry
  • Patent number: 8295891
    Abstract: A method and apparatus for optimization of a modem for high data rate applications comprise a plurality of hardware accelerators which are configured to perform data processing functions, wherein the hardware accelerators are parameterized, a processor is configured to selectively activate accelerators according to the desired function to conserve power requirements and a shared memory configured for communication between the plurality of hardware accelerators.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: October 23, 2012
    Assignee: Interdigital Technology Corporation
    Inventors: Douglas R. Castor, Edward L. Hepler, Michael F. Starsinic, William C. Hackett, David S. Bass, Joseph W. Gredone, Paul L. Russell, Jr., Richard P. Gorman
  • Patent number: 8290079
    Abstract: A method and apparatus for precoding validation in wireless communications with reduced error probability is disclosed. Error probability is reduced by applying phase rotations to precoding matrices, dedicated pilot symbols, or both to maximize a minimum pairwise distance.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: October 16, 2012
    Assignee: Interdigital Technology Corporation
    Inventor: Yingxue Li
  • Patent number: 8286052
    Abstract: A wireless communication method and apparatus for detecting and decoding enhanced dedicated channel (E-DCH) hybrid automatic repeat request (H-ARQ) indicator channel (E-HICH) transmissions are disclosed. A wireless transmit/receive unit (WTRU) receives E-HICH transmissions and detects an H-ARQ indicator transmitted via the E-HICH by performing a binary hypothesis test. The WTRU then generates an acknowledgement (ACK) message or a non-acknowledgement (NACK) message based on the detected H-ARQ indicator. A reliability test may be further performed to improve performance, whereby the binary hypothesis test may be performed only if the reliability test is passed.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: October 9, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Kyle Jung-Lin Pan, Rui Yang, Stephen E. Terry
  • Patent number: 8285319
    Abstract: A combined open loop and closed loop (channel quality indicator (CQI)-based) transmit power control (TPC) scheme with interference mitigation for a long term evolution (LTE) wireless transmit/receive unit (WTRU) is disclosed. The transmit power of the WTRU is derived based on a target signal-to-interference noise ratio (SINR) and a pathloss value. The pathloss value pertains to the downlink signal from a serving evolved Node-B (eNodeB) and includes shadowing. An interference and noise value of the serving eNodeB is included in the transmit power derivation, along with an offset constant value to adjust for downlink (DL) reference signal power and actual transmit power. A weighting factor is also used based on the availability of CQI feedback.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: October 9, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Sung-Hyuk Shin, Donald M. Grieco, Robert L. Olesen
  • Patent number: 8284854
    Abstract: A plurality of data signals are received over an antenna array having a plurality of antenna elements. The data signals are transmitted over a shared spectrum in a wireless communication system. A signal having each of the data signals is received over each antenna element. The plurality of data signals are grouped into a plurality of groups. The received signals of the antenna elements are matched filtered for a first group of the plurality of groups, producing a matched filtered result. Data is jointly detected of the first group using the matched filtered result. An interference correction signal is constructed using the detected data for each antenna element. The interference cancelled result is subtracted from the received signal of each antenna element, producing an interference cancelled result for each antenna element. Data is successively detected for remaining groups using the interference cancelled result for each antenna element.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: October 9, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Jaeyoung Kwak, Jung-Lin Pan, Ariela Zeira
  • Publication number: 20120250542
    Abstract: A method and apparatus for encoding channel quality indicator (CQI) and precoding control information (PCI) bits are disclosed. Each of the input bits, such as CQI bits and/or PCI bits, has a particular significance. The input bits are encoded with a linear block coding. The input bits are provided with an unequal error protection based on the significance of each input bit. The input bits may be duplicated based on the significance of each input bit and equal protection coding may be performed. A generator matrix for the encoding may be generated by elementary operation of conventional basis sequences to provide more protection to a most significant bit (MSB).
    Type: Application
    Filed: September 27, 2011
    Publication date: October 4, 2012
    Applicant: Interdigital Technology Corporation
    Inventors: Eldad M. Zeira, Alexander Reznik, Rui Yang, Philip J. Pietraski, Yongwen Yang
  • Patent number: 8280428
    Abstract: A wireless transmit/receive unit (WTRU) with improved performance through channel quality prediction employing link adaption techniques including a receiver which makes selective measurements on downlink transmissions, and then stores one or more of the measurements or a channel quality indicator derived therefrom. The receiver then retrieves one or more of the past measurements (or the past channel quality estimates themselves), and combines it with current measurements (or the current channel quality estimate), to predict what the channel quality will be at some future time and derive a predictive channel quality indicator (CQI). This predictive CQI, derived from both current channel measurements and at least one past channel measurement, is then sent to the transmitter for use in updating transmission parameters.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: October 2, 2012
    Assignee: InterDigital Technology Corporation
    Inventor: Philip J. Pietraski
  • Patent number: 8280412
    Abstract: At a first user equipment (UE), an uplink signal is received of at least one second UE is received and time marked. At the first UE, a downlink signal from at least one base station is received and time marked. Observed time differences of arrival are determined using the time markings. A position of the first UE is determined based on the determined time differences of arrival.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: October 2, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Marian Rudolf, Christopher Cave, Juan Carlos Zuniga
  • Patent number: 8280046
    Abstract: The present invention is related to a method and system for deriving an encryption key using joint randomness not shared by others (JRNSO). Communicating entities generate JRNSO bits from a channel impulse response (CIR) estimate and the JRNSO bits are used in generation of an encryption key. The authentication type may be IEEE 802.1x or a pre-shared key system. In an IEEE 802.1x system, a master key, a pairwise master key or a pairwise transient key may be generated using the JRNSO bits. The encryption key may be generated by using a Diffie-Hellman key derivation algorithm.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: October 2, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Marian Rudolf, Rajat Pritam Mukherjee
  • Patent number: 8274946
    Abstract: A method for controlling behavior of lower layer links related to media independent handover (MIH) of a mobile user comprises sending a MIH link actions request primitive from a MIH User entity to a MIH function (MIHF) for requesting actions to be executed on a set of lower layer links to heterogeneous radio access technology (RAT) networks. The primitive includes parameters that indicate the requested actions and an execution time delay. Confirmation primitives are sent back the MIH User entity to convey the results of the execution attempts on the requested actions.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: September 25, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Ulises Olvera-Hernandez, Khalid S. Hossain, Shamim Akbar Rahman, Mahmoud Watfa, Juan Carlos Zuniga
  • Patent number: 8270512
    Abstract: A method and apparatus for radio resources control in a multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) communication system are disclosed. Channel metric is calculated for each of a plurality of transmit antennas. Sub-carriers are allocated to each transmit antenna in accordance with the channel metric of each transmit antenna. Signals are transmitted using the allocated sub-carriers at each antenna. Adaptive modulation and coding and transmit power control of each sub-carrier may be further implemented in accordance with the channel metric. Power control may be implemented per antenna basis or per sub-carrier basis. In performing power control, a subset of transmit antennas may be selected and waterpouring may be applied only to the selected antennas. Waterpouring may be based on SNR instead of channel response.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: September 18, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Fatih Ozluturk, Philip J. Pietraski, Aykut Bultan