公开(公告)号：US10680771B2

公开(公告)日：2020-06-09

申请号：US14797644

申请日：2015-07-13

Applicant: QUALCOMM Incorporated

Inventor： Taesang Yoo ,  Xiliang Luo ,  Peter Gaal ,  Tao Luo ,  Durga Prasad Malladi ,  Yongbin Wei ,  Wanshi Chen ,  Hao Xu ,  Aleksandar Damnjanovic ,  Arumugam Chendamarai Kannan

IPC: H04L5/00 ,  H04L25/02 ,  H04W72/04 ,  H04W72/12 ,  H04W88/08

Abstract: Techniques are provided for combining different types of reference signals. A wireless communications network may be configured to allow a user equipment (UE) to combine multiple demodulation reference signals (DM-RSs) to support demodulation of a physical downlink shared channel (PDSCH), and/or other downlink transmissions, transmitted from a base station to the UE. The base station may provide explicit signaling that reference signals transmitted in two or more transmission time intervals may be combined, or a determination that reference signals transmitted in two or more transmission time intervals may be combined may be made implicitly based on system configuration and previous transmissions. Based on the explicit signaling and/or implicit determination, a UE may combine reference signals included in each of two or more reference signals for use in demodulation of downlink transmissions.

公开(公告)号：US10674449B2

公开(公告)日：2020-06-02

申请号：US16187836

申请日：2018-11-12

Applicant: QUALCOMM Incorporated

Inventor： Jing Sun ,  Xiaoxia Zhang ,  Taesang Yoo ,  Aleksandar Damnjanovic ,  Tamer Kadous ,  Yongbin Wei

IPC: H04B1/38 ,  H04W52/02 ,  H04W72/12 ,  H04W74/08 ,  H04B7/26 ,  H04W16/14 ,  H04W88/02

Abstract: Techniques are described herein for using a signal to wake up a user equipment (UE) that is in a low-power mode in a synchronized wireless communication system operating a shared radio frequency spectrum band. Once a base station wins a contention for a transmission opportunity in the shared radio frequency spectrum band, the base station may transmit a single signal before the transmission opportunity. After receiving the signal, the UE may begin monitoring for control information (e.g., control resource sets) associated with slots in the transmission opportunity. If the control information indicates that the content of the slot is for the UE, the UE may monitor the slot for its content.

公开(公告)号：US20200100250A1

公开(公告)日：2020-03-26

申请号：US16696766

申请日：2019-11-26

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Juan Montojo ,  Taesang Yoo ,  Siddhartha Mallik ,  Aleksandar Damnjanovic ,  Michael Mingxi Fan

IPC: H04W72/04 ,  H04W74/08 ,  H04W72/10 ,  H04W28/26 ,  H04L5/00

Abstract: Techniques are described for wireless communication at a wireless device. One method includes identifying a priority of the wireless device for a transmission interval of a radio frequency spectrum band shared by a plurality of network operating entities; identifying an absence of a predetermined transmission type in each of a number of clear channel assessment (CCA) slots of the transmission interval, in which each of the number of CCA slots is associated with a higher priority than the identified priority of the wireless device; and communicating over the radio frequency spectrum band based at least in part on the identified absence of the predetermined transmission type in each of the number of CCA slots associated with the higher priority than the priority of the wireless device.

公开(公告)号：US10581569B2

公开(公告)日：2020-03-03

申请号：US14819620

申请日：2015-08-06

Applicant: QUALCOMM Incorporated

Inventor： Aleksandar Damnjanovic ,  Madhavan Srinivasan Vajapeyam ,  Wanshi Chen ,  Peter Gaal ,  Tao Luo ,  Durga Prasad Malladi ,  Yongbin Wei

IPC: H04L5/00 ,  H04W24/08 ,  H04W56/00 ,  H04W72/04 ,  H04W72/08 ,  H04W74/00 ,  H04W76/27 ,  H04W76/12 ,  H04W88/08

Abstract: Techniques are described for wireless communication. A first method may include receiving at a user equipment (UE) over an unlicensed radio frequency spectrum band an indication of a time window associated with a transmission of a synchronization signal, and monitoring the unlicensed radio frequency spectrum band during the time window to receive a synchronization signal from a base station. A second method may include transmitting an indication of a time window associated with a transmission of a synchronization signal; performing a plurality of clear channel assessments (CCAs) on an unlicensed radio frequency spectrum band during the time window; and transmitting the synchronization signal over the unlicensed radio frequency spectrum band at a transmission time during the time window. The transmission time may be based at least in part on a result of at least one of the CCAs.

公开(公告)号：US20200059963A1

公开(公告)日：2020-02-20

申请号：US16537343

申请日：2019-08-09

Applicant: QUALCOMM Incorporated

Inventor： Aleksandar Damnjanovic ,  Yisheng Xue ,  Lorenzo Ferrari

IPC: H04W74/08 ,  H04W56/00 ,  H04W28/26

Abstract: Methods, systems, and devices for wireless communications are described. A first wireless device may perform a clear channel assessment on a medium to determine if the medium is available for communications with a second wireless device. Based on a successful clear channel assessment, the first wireless device may transmit a medium reservation message to the second wireless device. The second wireless device may then transmit a reservation response message to the first wireless device, where the reservation response message includes synchronization information for the first device to synchronize with the second wireless device. The synchronization information may include a duration of a channel occupancy time, a duration of a synchronous contention window, and/or a duration in which the first wireless device is to maintain synchronization with the second wireless device. Accordingly, the first wireless device and the second wireless device may communicate based on the synchronization information via the medium.

公开(公告)号：US20200037168A1

公开(公告)日：2020-01-30

申请号：US16519989

申请日：2019-07-23

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Aleksandar Damnjanovic

IPC: H04W16/14 ,  H04W72/04 ,  H04W74/08 ,  H04W28/26

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a trigger signal indicating that a base station has obtained access to a shared radio frequency spectrum band. The UE may transmit, in response to the trigger signal, a trigger response signal configured to reserve a channel of the shared radio frequency spectrum band for a downlink transmission by the base station, where the trigger response signal is transmitted for a time period extending to a scheduled beginning of the downlink transmission. The UE may receive the downlink transmission after an expiration of the time period and based at least in part on the trigger signal.

公开(公告)号：US10524279B2

公开(公告)日：2019-12-31

申请号：US15499570

申请日：2017-04-27

Applicant: QUALCOMM Incorporated

Inventor： Taesang Yoo ,  Xiaoxia Zhang ,  Jing Sun ,  Siddhartha Mallik ,  Juan Montojo ,  Aleksandar Damnjanovic

IPC: H04W72/12 ,  H04L5/00 ,  H04L25/02 ,  H04W28/02 ,  H04W72/04 ,  H04W72/08

Abstract: Joint aspects of coordinated multiple (CoMP) operations is discussed between multiple entities that may be in different CoMP clusters or even deployed by different operators. Participating base stations obtain channel related information such as sounding reference signals (SRS), channel state information (CSI), and the like from one or more neighbor user equipments (UE) served by a different base station. The base station determines a channel estimate at the neighbor UEs using the channel related information and selects a beamforming vector and schedules downlink transmissions to a served UE based on the channel estimates incorporating the channels of the other neighbor UEs. The selected beamforming vectors and transmission schedules minimizes the interference at the neighbor UEs.

公开(公告)号：US10524236B2

公开(公告)日：2019-12-31

申请号：US15064832

申请日：2016-03-09

Applicant: QUALCOMM Incorporated

Inventor： Tao Luo ,  Aleksandar Damnjanovic ,  Jing Sun

IPC: H04W72/04 ,  H04W74/08 ,  H04W76/15 ,  H04W16/14

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. An eNB transmits pre-grant(s) to a UE(s) for a target resource on a contention-based carrier. In response, the UE(s) perform a CCA/eCCA and, when successful, transmit a preamble to the eNB based on the pre-grant. The eNB detects the preamble(s) and transmits grant confirmation(s) to the UE(s) for which a preamble was detected. The grant confirmation(s) may modify the pre-grant(s). The eNB may overschedule a target resource and based on the received preambles may transmit grant confirmation(s) that instruct a portion of the UEs for which a preamble was received to transmit data on a target resource and may instruct the remaining portion of the UEs for which a preamble was received to cease or modify data transmission.

公开(公告)号：US20190394810A1

公开(公告)日：2019-12-26

申请号：US16553894

申请日：2019-08-28

Applicant: QUALCOMM Incorporated

Inventor： Shimman Arvind Patel ,  Wanshi Chen ,  Aleksandar Damnjanovic

IPC: H04W74/08

Abstract: Wireless devices may exchange data related to multiple available random access procedures for network access. A random access procedure of the available random access procedures may be selected, and a random access message transmitted based on the selected random access procedure. Available random access procedures may include procedures that provide for a different number of random access messages or that are for use in communications having different transmission time intervals (TTIs). The available random access procedures may include a contention-based random access procedure, in which an initial random access message may include a payload. In some examples, a number of random access resources may be provided within different frequency resources available to provide efficient usage of a channel bandwidth.

公开(公告)号：US10511405B2

公开(公告)日：2019-12-17

申请号：US15463825

申请日：2017-03-20

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Durga Prasad Malladi ,  Naga Bhushan ,  Yongbin Wei ,  Tingfang Ji ,  Aleksandar Damnjanovic ,  Wanshi Chen

IPC: H04L1/00 ,  H04L1/18 ,  H04L1/08 ,  H04L5/00 ,  H04L5/14 ,  H04L27/34

Abstract: Resource mapping and coding schemes to handle bursty interference are disclosed that provide for spreading the modulated symbols for one or more transmission code words over more symbols in the time-frequency transmission stream. Certain aspects allow for the modulated symbols to be based on bits from more than one code word. Other aspects also provide for re-mapping code word transmission sequences for re-transmissions based on the number of re-transmissions requested by the receiver. Additional aspects provide for layered coding that uses a lower fixed-size constellation to encode/decode transmissions in a layered manner in order to achieve a larger-size constellation encoding. The layered encoding process allows the transmitter and receiver to use different coding rates for each coding layer. The layered encoding process also allows interference from neighboring cells to be canceled without knowledge of the actual constellation used to code the interfering neighboring signal.