Patents Represented by Attorney Peng Zhu
  • Patent number: 8351372
    Abstract: In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: January 8, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Roberto Padovani, Paul E. Bender, Peter J. Black, Matthew S. Grob, Jurg K. Hinderling, Nagabhushana T. Sindhushayana, Charles E. Wheatley, III
  • Patent number: 8331286
    Abstract: Techniques for performing system selection and acquisition are described. In one design, a terminal may obtain at least one system record for at least one system utilizing orthogonal frequency division multiplexing (OFDM) or single-carrier frequency division multiplexing (SC-FDM). Each system record may include system identification information for an associated system and an index for an associated acquisition record. The terminal may also obtain at least one acquisition record for the at least one system. Each acquisition record may include at least one value for at least one configurable system parameter, e.g., FFT size, cyclic prefix length, number of guard subcarriers, etc. The terminal may perform acquisition for the at least one system in accordance with the at least one system record and the at least one acquisition record. The system and acquisition records may be stored in a Preferred Roaming List (PRL) or a Most Recently Used (MRU) list.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: December 11, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Rotem Cooper, Aamod Khandekar, Michael Mao Wang, Karthik Anantharaman
  • Patent number: 8311154
    Abstract: Techniques for performing joint detection with a common midamble for downlink transmission are described. In one design, a user equipment (UE) may obtain samples for a burst transmitted by a Node B on the downlink. The burst may include at least one data field and a common midamble. The UE may derive a channel impulse response estimate for each of multiple orthogonal codes based on (i) a channel impulse response estimate derived based on samples for the common midamble and (ii) a traffic-to-pilot ratio (T2P) estimated for that orthogonal code based on the samples for burst. The UE may perform joint detection, for the multiple orthogonal codes, on samples for the at least one data field based on the multiple channel impulse response estimates.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: November 13, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Avneesh Agrawal, Juan Montojo, Kee-Bong Song, Sharad Sambhwani
  • Patent number: 8311027
    Abstract: In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: November 13, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Roberto Padovani, Paul E. Bender, Peter J. Black, Matthew S. Grob, Jurg K. Hinderling, Nagabhushana T. Sindhushayana, Charles E. Wheatley, III
  • Patent number: 8305999
    Abstract: Techniques for allocating and mapping resources in a wireless communication system are described. The system may use hop-ports to facilitate allocation and use of subcarriers. In one aspect, the hop-ports may be partitioned into multiple subzones, with each subzone including a configurable number of hop-ports. The hop-ports within each subzone may be permuted or shuffled based on a permutation function. After permutation, the hop-ports in all subzones may be mapped to the subcarriers based on local or global hopping. In another aspect, a set of hop-ports may be mapped to a set of subcarriers. A hop-port may be mapped to an unavailable subcarrier and may then be remapped to another available subcarrier. In yet another aspect, a set of hop-ports may be mapped to a set of subcarriers distributed (e.g., evenly) across all subcarriers but avoiding subcarriers in a reserved zone.
    Type: Grant
    Filed: January 3, 2008
    Date of Patent: November 6, 2012
    Inventors: Ravi Palanki, Alexei Gorokhov, Aamod Khandekar, Naga Bhushan
  • Patent number: 8300715
    Abstract: To make efficient use of a frequency spectrum, a peer-to-peer network shares a wide area network (WAN) frequency spectrum as well as a time-frequency structure of the WAN, where the time-frequency structure includes a set of tones and symbols. A first wireless terminal monitors the time-frequency structure of the WAN to determine which subsets of tone-symbols are unused for WAN and/or other peer-to-peer connections. Then, the first wireless terminal selects and uses an unused subset of tone-symbols within the time-frequency structure for its peer-to-peer connection with a second wireless terminal.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: October 30, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junyi Li, Xinzhou Wu, Thomas Richardson
  • Patent number: 8290025
    Abstract: Improved decision directed adaptation and decision feedback equalizers are provided in a block coded digital communication system. The performance of a receiver is significantly improved by allowing the decision feedback equalizer to perform time-tracking and residual frequency offset compensation during the data portion of a frame. This is accomplished by capitalizing on the inherent correlation among the chips of a code word in a block coded digital communication system to identify certain instances where more reliable symbol estimates can be derived from a sliced chip without introduction the delay inherent in decoding. As the more reliable symbol estimates are fed back into the chip slicer, the total efficiency of the decision feedback equalizer is improved and the more reliable symbol estimates can be used to replace older content in the feedback filter to further improve the accuracy of the modified slicer input and further decrease the effects of error propagation by the decision feedback equalizer.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: October 16, 2012
    Assignee: Qualcomm Incorporated
    Inventors: John E. Smee, Haitao Zhang
  • Patent number: 8289954
    Abstract: Systems and methodologies are described that facilitate paging for establishing a Voice Call Continuity (VCC)-supported voice call in a network containing access point(s) that can support packet switched (PS) voice communication, such as Voice over Internet Protocol (VoIP), and access point(s) that can support only circuit switched (CS) voice communication. Paging signals as described herein are selectively delivered, such that a desired terminal receives a single PS paging signal if located at a VoIP-capable access point and a single CS paging signal otherwise. A split paging technique is described herein, wherein PS paging signals are delivered to VoIP-capable access points and CS paging signals are delivered to non-VoIP-capable access points substantially simultaneously. Additionally, a sequential paging technique is described herein, wherein PS paging signals are delivered to VoIP-capable access points and, if no response is received from a desired terminal, CS-domain paging is conducted.
    Type: Grant
    Filed: April 21, 2008
    Date of Patent: October 16, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Nathan Edward Tenny, Oronzo Flore
  • Patent number: 8274956
    Abstract: Broadcast or multicast traffic is classified into different types of traffic such that different types of traffic are transmitted over different sub-networks. In addition, different transmission schedules may be associated with each of the different sub-networks. A device may thus be configured to receive only a selected portion of the different types of traffic by only waking from a power save mode at the intervals at which the corresponding sub-network sends the traffic. The standby time of the wireless station may thus be improved because the wireless station may awaken less frequently and for shorter periods of time. Different sub-networks carrying different types of broadcast and multicast traffic may be implemented in an 802.11-based system. For example, a single access point may define multiple basic service set identifiers for a single wireless channel.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: September 25, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Arnaud Meylan, Manoj M. Deshpande, Sanjiv Nanda
  • Patent number: 8275377
    Abstract: The disclosure is directed to an access terminal, and method for selecting an access point for handing off the access terminal. The access terminal may include a processor. The processor may be configured to access a list access points and select one of the access points on the list based on the current traffic state of the access terminal.
    Type: Grant
    Filed: October 5, 2006
    Date of Patent: September 25, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Sanjiv Nanda, Arnaud Meylan, Manoj M. Deshpande, Ranjith Jayaram
  • Patent number: 8274945
    Abstract: The disclosure is directed to a mobile communication device that is capable of accessing different types of networks such as a circuit-switched network, or any cellular network, and a packet-switched network. During hand-over from the first network to the second network, the sender of packets/frames expands or compresses the packet-switched packets using well-known time-warping techniques. At the receiver end, the received time-warped packets and frames from the second network are appropriately selected so that no unwanted artifacts are introduced during playback.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: September 25, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Ranjith Jayaram, Sanjiv Nanda, Manoj Deshpande, Arnaud Meylan
  • Patent number: 8270923
    Abstract: To mitigate interference between multiple peer-to-peer devices, transmitter yielding and/or receiver yielding may be performed among devices operating in a peer-to-peer network. Generally, a transmitter device will yield communications on a time slot to a higher priority transmitter device if it will cause unacceptable interference to a higher priority receiver device. Likewise, a receiver device may yield use of the time slot if interference is unacceptably high. Both transmitter and receiver yielding may be improved by use of beamforming at a receiver device. By utilizing beamforming information to make the transmitter and/or receiver yielding decisions, better interference mitigation may be achieved.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: September 18, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junyi Li, Xinzhou Wu, Aleksandar Jovicic, Thomas Richardson
  • Patent number: 8259743
    Abstract: An improved mechanism is provided that facilitates transmission of small packets within an ad hoc peer-to-peer network. A small packet is identified to a receiver within a control channel so that its lower power can be considered in an interference management protocol implemented among local peer devices. In a traffic slot, a transmitter voluntarily backs down on the transmitter power as a smaller packet will require much lower signal-to-noise ratio. This will improve the signal energy per bit per noise power density for the transmission as well as minimize the interference caused to other wireless communications happening in the same spectrum.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: September 4, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junyi Li, Rajiv Laroia, Saurabh Tavildar, Xinzhou Wu
  • Patent number: 8238836
    Abstract: An improved mechanism is provided that facilitates transmission of small packets within an ad hoc peer-to-peer network. A small packet is identified to a receiver within a control channel so that its lower power can be considered in an interference management protocol implemented among local peer devices. In a traffic slot, a transmitter voluntarily backs down on the transmitter power as a smaller packet will require much lower signal-to-noise ratio. This will improve the signal energy per bit per noise power density for the transmission as well as minimize the interference caused to other wireless communications happening in the same spectrum.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: August 7, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junyi Li, Rajiv Laroia, Saurabh Tavildar, Xinzhou Wu
  • Patent number: 8228949
    Abstract: For quasi-orthogonal multiplexing in an OFDMA system, multiple (M) sets of traffic channels are defined for each base station. The traffic channels in each set are orthogonal to one another and may be pseudo-random with respect to the traffic channels in each of the other sets. The minimum number of sets of traffic channels (L) is used to support a given number of (U) terminals selected for data transmission, where M?L?1 and U?1. Each terminal transmits data and pilot symbols on its traffic channel. A base station receives data transmissions from all terminals and may perform receiver spatial processing on received symbols with spatial filter matrices to obtain detected data symbols. The spatial filter matrix for each subband may be derived based on channel response estimates for all terminals transmitting on that subband.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: July 24, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Arak Sutivong, Avneesh Agrawal
  • Patent number: 8213483
    Abstract: Systems and methodologies are described that facilitate defining and utilizing hopping patterns to transmit broadband pilot signals in a wireless communications network. Portions of bandwidth can be dedicated to transmitting the broadband pilot data, and patterns can be utilized to hop across frequencies in given time periods to effectively utilize the entire dedicated bandwidth. Moreover, the periodicity for transmitting the data is configurable to allow devices requiring additional scheduling (e.g., high activity devices) to transmit the broadband pilot data more frequently. The hopping patterns can also hop across cyclic shifts of the patterns to provide optimum diversity for transmitting broadband pilot signals.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: July 3, 2012
    Assignee: QUALCOMM Incorporated
    Inventor: Durga Prasad Malladi
  • Patent number: 8208459
    Abstract: Methods and apparatus related to partitioning traffic segments are described. An access router, having concurrent connections with two access terminals, each desiring to transmit traffic signals to the access router in the same traffic segment, partitions a traffic segment. The partition is such that a first portion of the traffic segment is allocated to a first access terminal and a second portion of the traffic segment is allocated to the second access terminal. Control information, e.g., conveying partition information, is communicated to access terminals prior to the traffic segment. In some embodiments, the partition information is communicated as part of a transmission request response signal, e.g., via phase of the request response signal. An access terminal which has been allocated a traffic segment partition portion identifies is allocation from the transmitted control information, and subsequently transmits traffic signals to the access router in its allocated portion of the traffic segment.
    Type: Grant
    Filed: November 10, 2008
    Date of Patent: June 26, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Gavin Horn, Ashwin Sampath, Junyi Li, Rajiv Laroia
  • Patent number: 8208516
    Abstract: The disclosure is directed to an apparatus and method for encoder initialization and communications. The apparatus may include a database and an encoder module. The database may be configured to receive a plurality of parameters to be used for operation of the encoder module. The database may be further configured to store the plurality of parameters and to provide the plurality of parameters to the encoder module. The encoder module includes an encoder configured to be initialized based on the plurality of parameters from the database. When invoked, the encoder may rely on the database to initialize rather than performing measurements on the current signal that is to be encoded. In one aspect, the apparatus may be an access terminal that can seamlessly switch between different domains, different networks, different base stations, and different access points.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: June 26, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Arnaud Meylan, Mark Whitney, Ranjith Jayaram
  • Patent number: 8203960
    Abstract: An improved mechanism is provided that facilitates transmission of small packets within an ad hoc peer-to-peer network. A small packet is identified to a receiver within a control channel so that its lower power can be considered in an interference management protocol implemented among local peer devices. In a traffic slot, a transmitter voluntarily backs down on the transmitter power as a smaller packet will require much lower signal-to-noise ratio. This will improve the signal energy per bit per noise power density for the transmission as well as minimize the interference caused to other wireless communications happening in the same spectrum.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: June 19, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junyi Li, Rajiv Laroia, Saurabh Tavildar, Xinzhou Wu
  • Patent number: 8199766
    Abstract: An improved mechanism is provided that facilitates transmission of small packets within an ad hoc peer-to-peer network. A small packet is identified to a receiver within a control channel so that its lower power can be considered in an interference management protocol implemented among local peer devices. In a traffic slot, a transmitter voluntarily backs down on the transmitter power as a smaller packet will require much lower signal-to-noise ratio. This will improve the signal energy per bit per noise power density for the transmission as well as minimize the interference caused to other wireless communications happening in the same spectrum.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: June 12, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junyi Li, Rajiv Laroia, Saurabh Tavildar, Xinzhou Wu