Patents by Inventor Taesang Yoo

Taesang Yoo 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: 10164746
    Abstract: A network may use enhanced sounding reference signal (SRS) transmission techniques to support reference signal transmissions over shared spectrum. For example, a wireless device may receive an uplink grant and an indicator. The uplink grant may include an uplink resource allocation to the wireless device and the indicator may alert the device of a forthcoming reference signal transmission. The wireless device may use the uplink grant and the indicator to determine a reference signal transmission period relative to the resources assigned in the uplink grant. For example, the wireless device may determine that the reference signal transmission period is prior to, during, or subsequent to the uplink transmission period. In some cases, a wireless device may be aperiodically or periodically scheduled for reference signal transmissions.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: December 25, 2018
    Assignee: Qualcomm Incorporated
    Inventors: Zhifei Fan, Taesang Yoo, Jing Sun, Xiaoxia Zhang
  • Publication number: 20180368108
    Abstract: Multiple modulation and coding scheme (MCS) tables for new radio (NR) networks is disclosed. Multiple MCS tables are defined with different sets of MCS values selected for improved performance in various transmission conditions. The multiple MCS tables may be known to base stations and user equipments (UEs) in the network. A serving base station may determine a set of transmission characteristics related to a transmission environment of a UE. The base station selects one of the MCS tables of the multiple MCS tables based on the set of transmission characteristics. The selected MCS table includes MCS values that may provide improved performance for the UE considering one or more of the characteristics of the set of transmission characteristics. The base station will then transmit an indication of the selected MCS table to the served UE.
    Type: Application
    Filed: June 4, 2018
    Publication date: December 20, 2018
    Inventors: Weiliang Zeng, Taesang Yoo, Seyed Ali Akbar Fakoorian, Joseph Binamira Soriaga
  • Publication number: 20180359780
    Abstract: Consideration of contention windows with spatial listen before talk (LBT) operations is discussed. In multiple input, multiple output (MIMO) transmission operations over a shared transmission medium, use of spatial LBT transmissions may be implemented with fairness options and parameters influenced by a condition of the MIMO transmitter, such conditions as the level of MIMO capability or the enablement of polite spatial LBT nulling transmissions. When a MIMO transmitter identifies data for transmission, it may determine a configuration of the medium access contention operation, synchronous or asynchronous content, based on the condition of the MIMO transmitter. The MIMO transmitter may then transmit the data either using spatial LBT transmission or not according to the configuration of the medium access contention operation.
    Type: Application
    Filed: May 10, 2018
    Publication date: December 13, 2018
    Inventors: Xiaoxia Zhang, Taesang Yoo, Seyed Ali Akbar Fakoorian, Zhifei Fan
  • Publication number: 20180352520
    Abstract: Wireless communications systems and methods related to improving macro diversity are provided. A first wireless communication device communicates, in a frequency channel, a first signal with a user equipment (UE) during a first time period. The first wireless communication device coordinates, with a second wireless communication device, a communication of a second signal with the UE in the frequency channel during a second time period. The coordination with the second wireless communication device is based on a switch to coordinate with the second wireless communication device based on at least occupancy of the frequency channel. The second wireless communication device communicates, in the frequency channel, the second signal with the UE during the second time period based on the coordination. The first wireless communication device and the second wireless communication device are different. The first time period and the second time period are different.
    Type: Application
    Filed: June 6, 2017
    Publication date: December 6, 2018
    Inventors: Xiaoxia Zhang, Siddhartha Mallik, Taesang Yoo, Tao Luo
  • Publication number: 20180351591
    Abstract: Cross-operator, cross-link adjacent channel interference with dynamic time division duplex (TDD) is discussed. For a network environment with co-site base stations, base stations attempting to switch the default direction to downlink may monitor for uplink reservations signals transmitted between the neighboring base stations in various ways. For example, the co-site base station may only monitor for an uplink reservation signal on its own channel or may attempt to monitor for the reservation signal in its own channel and adjacent channels. The adjacent base stations may transmit reservation signals in their own channel and the adjacent channels, so that the co-site base station would monitor for the communication intention by monitoring its own channel. Further, each network operator may be assigned a specific symbol location for the reservation signals. Still other aspects provide the neighboring base stations from different operators to pool the channels and transmit according to a shared spectrum.
    Type: Application
    Filed: May 29, 2018
    Publication date: December 6, 2018
    Inventors: Seyed Ali Akbar Fakoorian, Xiaoxia Zhang, Taesang Yoo
  • Patent number: 10149293
    Abstract: Techniques are described for preempting resource allocations to one or more UEs in the event that delay sensitive data is received. A resource allocation of a number of symbols may be granted to a first user equipment (UE) for first associated data to be transmitted. Subsequently, data may be received for a second UE that is more delay sensitive than the first data. The resource allocation to the first UE may be preempted, and resources allocated to the second UE for the second data within a variable length transmission time interval (TTI) of the resource allocation to the first UE. UEs may monitor for preemption during transmissions to other UEs in order to receive new resource grants associated with the preempted resource grant. Whether a UE monitors transmissions for preemption may be determined based on a quality or service (QoS) of the UE.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: December 4, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Jelena Damnjanovic, Aleksandar Damnjanovic, Taesang Yoo, Siddhartha Mallik, Madhavan Srinivasan Vajapeyam, Durga Prasad Malladi, Yongbin Wei
  • Publication number: 20180343588
    Abstract: A medium reservation framework is disclosed for coexistence of coordinated and uncoordinated wireless networks in licensed spectrum and shared spectrum. The proposed medium reservation framework organically takes into account operating regimes with different numbers of Tx/Rx antennas per node, provides flexibility in trading off medium contention aggressiveness and power saving, leverages the inherent synchronization nature of NR, and covers both coordinated and uncoordinated operation scenarios. Various aspects of the medium reservation framework may be centered on one or more combinations of some basic building blocks, such as an operation grid, synchronization signals, and reservation messages, such as a reservation request signal (RRQ) and one or more a reservation response signals (RRS).
    Type: Application
    Filed: May 21, 2018
    Publication date: November 29, 2018
    Inventors: Ahmed Kamel Sadek, Yisheng Xue, Siddhartha Mallik, Tamer Kadous, Xiaoxia Zhang, Taesang Yoo, Michael Mingxi Fan, Aleksandar Damnjanovic, Yongbin Wei, Jing Sun
  • Patent number: 10143005
    Abstract: Methods and apparatuses for managing uplink scheduling for one or more user equipment served by a network entity in a wireless communications system are presented. For instance, an example method is presented that includes generating, by the network entity, an uplink bandwidth allocation map, the uplink bandwidth allocation map defining an uplink bandwidth allocation for at least one of the one or more user equipment for at least one of a plurality of uplink transmission window lengths. In addition, the example method includes transmitting the uplink bandwidth allocation map to at least one of the one or more user equipment.
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: November 27, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Arumugam Chendamarai Kannan, Taesang Yoo, Siddhartha Mallik, Jelena Damnjanovic, Yongbin Wei, Durga Prasad Malladi
  • Publication number: 20180338322
    Abstract: A method, an apparatus, and a computer-readable medium for wireless communication are provided. The apparatus may be a base station. The apparatus may transmit a first grant to a UE. The apparatus may determine whether an acknowledgment to the first grant is received. When the acknowledgment to the first grant fails to be received by the apparatus, the apparatus may transmit, to the UE, a second grant including information regarding the first grant. In another aspect, an apparatus may be a UE. The apparatus may receive a first grant. The first grant may include a first Mayday bit. The apparatus may receive a second grant. The second grant may include a TTI count corresponding to a number of unacknowledged TTIs. The second grant may further include a second Mayday bit. The apparatus may determine an acknowledgment based on the TTI count and the first and second Mayday bits.
    Type: Application
    Filed: July 31, 2018
    Publication date: November 22, 2018
    Inventors: Jing SUN, Taesang YOO, Tao LUO
  • Publication number: 20180337716
    Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may obtain an interference and noise covariance matrix for a plurality of antennas of the UE. The UE may generate an approximated covariance matrix based on the inference and noise covariance matrix and a number of the antennas of the plurality of antennas associated with transmit operations at the UE. The number of the antennas associated with transmit operations at the UE may be fewer than a total number of the antennas. The UE may precode a sounding reference signal (SRS) using the approximated covariance matrix, and transmit the precoded SRS using the antennas associated with the transmit operations.
    Type: Application
    Filed: April 17, 2018
    Publication date: November 22, 2018
    Inventors: Seyed Ali Akbar Fakoorian, Xiaoxia Zhang, Taesang Yoo
  • Patent number: 10136333
    Abstract: Methods, systems, and devices are described for wireless communication. A device may use enhanced reporting mechanisms to support control information reporting on shared spectrum. In some cases, a device may utilize enhanced component carriers (eCCs) for data transmissions. In one example, the device may transmit control information (e.g., ACK/NACK, CSI, etc.) to a corresponding device using a CCA exempt transmission (CET). In another example, a device may report control information quasi-periodically. For instance, a device may be assigned a specified interval and a control feedback window for reporting control information (e.g., CSI). The window may provide a duration prior and subsequent to the specified interval during which a UE may transmit control information. For example, the device may perform a CCA reserving the channel for a duration that does not include the specified interval but may transmit feedback information based on determining the specified interval falls within the assigned window.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: November 20, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Taesang Yoo, Siddhartha Mallik, Xiaoxia Zhang, Jing Sun, Arumugam Chendamarai Kannan
  • Publication number: 20180331861
    Abstract: Wireless communications systems and methods related to over-the-air uplink-downlink (UL-DL) reciprocity calibration. A central unit transmits downlink (DL) calibration reference signal (RS) and a calibration request. The central unit receives, in response to the calibration request, a first uplink (UL) calibration RS and a first DL channel estimate associated with a first transmission point (TP) and a first wireless communication device. The central unit transmits a DL coordinated multipoint (CoMP) joint transmission signal according to an uplink-downlink (UL-DL) reciprocity calibration. The UL-DL reciprocity calibration is based on at least a first UL channel estimate based on the first UL calibration RS, the first DL channel estimate, a second UL channel estimate associated with a second TP and the first wireless communication device, and a second DL channel estimate associated with the second TP and the first wireless communication device.
    Type: Application
    Filed: July 20, 2018
    Publication date: November 15, 2018
    Inventors: Taesang Yoo, Dinkar Vasudevan, Seyedkianoush Hosseini, Jing Sun, Xiaoxia Zhang, Siddhartha Mallik, Juan Montojo
  • Patent number: 10129770
    Abstract: Methods, systems, and devices for broadcast transmissions in wireless communication are described. A base station may transmit a control reference signal (CRS), a UE-specific reference signal (UERS), and broadcast data (e.g., broadcast physical downlink shared channel (PDSCH) data) in a broadcast downlink transmission. A UE may identify that the CRS and UERS are associated with the broadcast downlink data, and demodulate the broadcast downlink data in the broadcast downlink transmission based at least in part on the CRS and UERS. A UE may estimate a frequency offset based on a phase difference between the CRS and UERS, combine the CRS and UERS for use in a channel estimation, and demodulate the broadcast data based at least in part on the estimated frequency offset and channel estimation. The base station may provide signaling, such as dynamic or semi-static signaling, that indicates presence of both CRS and UERS.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: November 13, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Taesang Yoo, Dinkar Vasudevan, Jing Sun, Juan Montojo
  • Publication number: 20180324713
    Abstract: Certain aspects of the present disclosure relate to methods and apparatus for sounding reference signal (SRS) coordination, power control, and synchronization for distributed coordinated multipoint (CoMP) using communications systems operating according to new radio (NR) technologies. For example, a method for wireless communications by a network entity includes determining a first amount of transmission (Tx) power for transmission of signals originating from a first cluster center that is connected to the network entity, determining a second amount of Tx power for transmission of signals originating from at least a second cluster center that is connected to the network entity, and transmitting signals for one or more user equipment (UEs) served by the first cluster center and one or more UEs served by the second cluster center based on the first amount of Tx power and the second amount of Tx power.
    Type: Application
    Filed: April 27, 2018
    Publication date: November 8, 2018
    Inventors: Taesang YOO, Jing SUN, Siddhartha MALLIK, Xiaoxia ZHANG, Tamer Adel KADOUS
  • Publication number: 20180324856
    Abstract: Wireless communications systems and methods related to updating control information based on medium sensing are provided. A first wireless communication device communicates with a second wireless communication device, a first transmission grant for a transmission opportunity (TXOP) in a frequency band. The first wireless communication device performs medium sensing for the TXOP. The performing the medium sensing includes detecting a reservation signal for the TXOP. The first wireless communication device transmits, to the second wireless communication device, an updated transmission grant for the TXOP based on at least the first transmission grant and the medium sensing. The first wireless communication device transmits, to the second wireless communication device in the frequency band, data during the TXOP based on the updated transmission grant.
    Type: Application
    Filed: February 1, 2018
    Publication date: November 8, 2018
    Inventors: Xiaoxia Zhang, Taesang Yoo
  • Patent number: 10123358
    Abstract: Wireless communications systems and methods related to managing dynamic priority-based spectrum access are provided. A first wireless communication device transmits dynamic priority information for accessing a shared spectrum in a transmission opportunity (TXOP). The shared spectrum is shared by a plurality of network operating entities. The first wireless communication device is associated with a first network operating entity of a plurality of network operating entities. The dynamic priority information indicates an access priority of the first network operating entity among the plurality of network operating entities in the TXOP. The first wireless communication device communicates with a second wireless communication device associated with the first network operating entity in the TXOP based on the dynamic priority information.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: November 6, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Seyed Ali Akbar Fakoorian, Xiaoxia Zhang, Taesang Yoo, Juan Montojo
  • Patent number: 10123323
    Abstract: Various aspects described herein relate to communicating using dynamic uplink and downlink transmission time interval (TTI) switching in a wireless network. A notification can be received from a network entity of switching a configurable TTI from downlink communications to uplink communications. The configurable TTI can be one of a plurality of TTIs in a frame structure that allows dynamic switching of configurable TTIs between downlink and uplink communications within a frame. Additionally, uplink communications can be transmitted to the network entity during the configurable TTI based at least in part on the notification.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: November 6, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Siddhartha Mallik, Taesang Yoo, Jelena Damnjanovic, Aleksandar Damnjanovic, Arumugam Chendamarai Kannan, Yongbin Wei, Durga Prasad Malladi
  • Publication number: 20180317186
    Abstract: Over-the-air phase synchronization for reciprocity-based coordinated multipoint (CoMP) joint transmission is discussed. The base stations of the CoMP group and served user equipment (UEs) each transmit phase synchronization reference signals (PSRS). The receiving nodes will compute co-phasing values representing the phase difference between pairs of the PSRS. For example, the difference between two downlink PSRS computed at the UE for a downlink co-phasing value, and the difference between a single PSRS received at two base stations computed at the base station for an uplink co-phasing value. The base stations of the CoMP group may determine a phase compensation by computing the differences between the uplink and downlink co-phasing values and use that phase compensation to adjust communications by the base stations in the CoMP group. In other aspects, the computed co-phasing values may be used to modulate each nodes transmission of its respective PSRS.
    Type: Application
    Filed: December 4, 2017
    Publication date: November 1, 2018
    Inventors: Zhifei Fan, Taesang Yoo, Xiaoxia Zhang, Seyed Ali Akbar Fakoorian
  • Patent number: 10117207
    Abstract: Over-the-air (OTA) phase synchronization for reciprocity-based coordinated multipoint (CoMP) joint transmission is disclosed. Phase synchronization reference signals (PSRS) are transmitted within a CoMP operation that can be used to determine the phase drifts of the transmit and receive chains of the base stations. These phase drifts can then be used to obtain a relative phase drift between the uplink and downlink channels. When estimating the uplink channel from the sounding reference signals (SRS), the relative phase drift may be applied to estimate the downlink channel as well. The OTA phase synchronization may be performed with a user equipment (UE)-assisted or inter-base station procedures.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: October 30, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Zhifei Fan, Taesang Yoo, Dinkar Vasudevan
  • Patent number: 10111111
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in which a system timing is estimated, derived from timing of one or more cells, a timing offset is determined for a plurality of cells relative to the estimated system timing, and signals received form the plurality of cells are processed using the timing offsets. In addition, a method, an apparatus, and a computer program product for wireless communication are provided in which a carrier frequency is estimated, derived from a frequency of one or more cells, a frequency offset is determined for a plurality of cells relative to the estimated system timing, and signals received form the plurality of cells are processed using the frequency offsets.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: October 23, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Taesang Yoo, Tao Luo, Xiaoxia Zhang, Ke Liu