公开(公告)号：US10341890B2

公开(公告)日：2019-07-02

申请号：US14565085

申请日：2014-12-09

Applicant: QUALCOMM Incorporated

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

IPC: H04W24/10 ,  H04W16/14 ,  H04W74/08 ,  H04L5/00 ,  H04W72/04 ,  H04W84/12

Abstract: Channel state information (CSI) feedback in long term evolution (LTE) and LTE-Advanced (LTE-A) networks including contention-based shared unlicensed spectrum is disclosed in which a user equipment (UE) identifies at least one carrier utilizing a contention based radio frequency spectrum. The UE detects a transmission signal indicative of clear channel assessment (CCA) result information for the carrier and determines whether a reference signal for channel state information measurement is present in a subframe based on the detected transmission signal. The UE would transmit a measurement report based on this presence determination of the reference signal.

公开(公告)号：US20190190679A1

公开(公告)日：2019-06-20

申请号：US16266878

申请日：2019-02-04

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Aleksandar Damnjanovic ,  Peter Gaal ,  Ravi Teja Sukhavasi ,  Xiaoxia Zhang

IPC: H04L5/00 ,  H04L1/16 ,  H04L1/18 ,  H04W74/08 ,  H04W76/28

CPC classification number: H04L5/0055 ,  H04L1/1657 ,  H04L1/1812 ,  H04L1/1822 ,  H04L1/187 ,  H04W4/06 ,  H04W72/0406 ,  H04W72/0413 ,  H04W72/042 ,  H04W72/0453 ,  H04W74/08 ,  H04W74/0808 ,  H04W76/28

Abstract: Techniques and devices are described for wireless communication. A base station may determine a parameter associated with a transmission such as hybrid automatic repeat request (HARD) feedback, a signal-to-noise ratio, or a determination regarding whether the transmission was successfully decoded. The base station may then determine a contention window adjustment value based on the parameter. The base station may then apply weighting factor (e.g., based on the time of the transmission, a number of devices being served, aspects of the transmission parameter, etc.) to the contention window adjustment value may adjust a contention window size for a second transmission based on the weighted contention window adjustment value (and, in some cases, other weighted adjustments based on other transmissions). The base station may then perform a clear channel assessment (CCA) based on the contention window size.

公开(公告)号：US20190141783A1

公开(公告)日：2019-05-09

申请号：US16180938

申请日：2018-11-05

Applicant: QUALCOMM Incorporated

Inventor： Rahul Malik ,  Srinivas Yerramalli ,  Kaushik Chakraborty ,  Tamer Kadous

IPC: H04W88/06 ,  H04W74/08 ,  H04L27/26 ,  H04L5/00 ,  H04W76/27 ,  H04W8/24

CPC classification number: H04W88/06 ,  H04L5/0007 ,  H04L5/001 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/006 ,  H04L5/0098 ,  H04L27/261 ,  H04L27/2666 ,  H04W8/24 ,  H04W36/06 ,  H04W74/0833 ,  H04W76/15 ,  H04W76/27 ,  H04W88/02 ,  H04W88/08

Abstract: Methods, systems, and devices for wireless communications are described that provide for activating and deactivating high-band connections, such as millimeter wave (mmW) connections while maintaining a low-band connection, based on a state of a user equipment (UE). An initial low-band connection, such as a connection that uses lower frequencies than mmW frequencies, may be established by a UE and a base station, and the base station may configure the UE for one or more high-band connections with one or more high-band base stations. The base station may provide an activation command to the UE to activate a high-band connection, and the UE may determine a currently supported mode for the activated high-band connection and establish the high-band connection based on the currently supported mode.

公开(公告)号：US20190141539A1

公开(公告)日：2019-05-09

申请号：US16182527

申请日：2018-11-06

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Rahul Malik ,  Kaushik Chakraborty

IPC: H04W16/14 ,  H04L1/00

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive data transmissions on primary cell and transmit feedback for the data transmissions on a secondary cell, where carriers on the secondary cell have a subcarrier spacing that is greater than the subcarrier spacing of carriers on the primary cell. The UE may perform a self-contained transmission by receiving data and transmitting feedback within a single transmission opportunity. The base station may schedule the UE for only downlink transmissions in the primary cell, removing uplink transmission resources and guard periods from slots of primary cell carriers. The UE may transmit other information on the high band cell as well, such as a channel quality indicator or scheduling requests. The base station may apply rate adjustments for downlink transmission in the next slot of a primary cell carrier.

公开(公告)号：US10271305B2

公开(公告)日：2019-04-23

申请号：US15222731

申请日：2016-07-28

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Srinivas Yerramalli ,  Tao Luo

IPC: H04W4/00 ,  H04W72/00 ,  H04W4/06 ,  H04L5/00 ,  H04W74/08 ,  H04W16/14 ,  H04W48/08 ,  H04W74/00 ,  H04W84/04

Abstract: A method and apparatus for identifying joint transmissions in unlicensed spectrum are described, including receiving, at a user equipment (UE), a frame from one or more network entities over a contention-based medium, wherein the frame includes a preamble. The method and apparatus further include determining whether the frame corresponds to a unicast transmission or a joint transmission based on the preamble. In another aspect, a method and apparatus include determining, at a network entity, whether a frame corresponds to a unicast transmission or a joint transmission. The method and apparatus include transmitting the frame with a preamble to a UE over a contention-based medium, the preamble being based on determining whether the frame corresponds to the unicast transmission or the joint transmission. For example, the type of scrambling applied to the preamble may be based on whether the frame corresponds to unicast transmission or joint transmission.

公开(公告)号：US20190110254A1

公开(公告)日：2019-04-11

申请号：US16153166

申请日：2018-10-05

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Rahul Malik ,  Tamer Kadous

IPC: H04W52/02 ,  H04W56/00 ,  H04W72/04 ,  H04L5/00

Abstract: Methods, systems, and devices for wireless communications are described that asynchronous carrier aggregation, including between high frequency band and lower frequency band transmissions. A user equipment (UE) may be configured to monitor transmissions in a first frequency band and a second frequency band. The UE may measure a timing difference between transmissions in the first frequency band and one or more of the transmissions in the second frequency band, and transmit an indication of the timing difference to a base station. The base station may use the timing difference to determine whether the UE is to use asynchronous carrier aggregation. If the base station determines that the UE is to use asynchronous carrier aggregation, the base station may configure the UE to observe at least a minimum amount of delay when conducting uplink signaling via one of the frequency bands.

公开(公告)号：US20190082333A1

公开(公告)日：2019-03-14

申请号：US16123899

申请日：2018-09-06

Applicant: QUALCOMM Incorporated

Inventor： Rahul Malik ,  Srinivas Yerramalli ,  Kaushik Chakraborty ,  Tamer Kadous

IPC: H04W24/02 ,  H04B7/0408

Abstract: Methods, systems, and devices for wireless communications are described that provide for partitioning two or more dimensions of an uplink transmission, where different partitions in each partitioned dimension can be used to provide different feedback information. A UE may measure one or more downlink transmissions from a base station (e.g., beam measurements in a beam sweep procedure), and select a partition of one of the partitioned dimensions to indicate feedback related to the measured downlink transmissions. The feedback may indicate, for example, a particular beam that may be used for an active beam pair, beam refinement information, or other feedback. The partitioned dimensions may include one or more of time resource, a frequency resource dimension, a root sequence dimension, a cyclic shift dimension, a time-frequency dimension, or any combination thereof.

公开(公告)号：US10159089B2

公开(公告)日：2018-12-18

申请号：US15077587

申请日：2016-03-22

Applicant: QUALCOMM Incorporated

Inventor： Tao Luo ,  Durga Prasad Malladi ,  Srinivas Yerramalli

IPC: H04W72/12 ,  H04W72/14 ,  H04W74/08 ,  H04W16/14

Abstract: Methods, systems, and devices for wireless communication are described. A wireless device may determine whether a source carrier for an uplink grant is in licensed or unlicensed spectrum and then select a listen-before-talk (LBT) procedure for accessing a shared spectrum channel. For example, the device may select one range parameter (e.g., q value) for a backoff procedure of a clear channel assessment (CCA) if the source carrier is in unlicensed spectrum, and a different (e.g., larger) range parameter if the source carrier is in licensed spectrum. In some cases, the device may operate in a stand-alone operating mode and the source carrier may be identified based on the mode. In some cases, the device may receive signaling that indicates a carrier configuration, and may select the LBT procedure based on whether a carrier configured on unlicensed spectrum is self-scheduled or cross-carrier scheduled.

公开(公告)号：US10159049B2

公开(公告)日：2018-12-18

申请号：US15680017

申请日：2017-08-17

Applicant: QUALCOMM Incorporated

Inventor： Onkar Dabeer ,  Aleksandar Damnjanovic ,  Srinivas Yerramalli ,  Wanshi Chen ,  Kiran Kumar Somasundaram ,  Naga Bhushan

IPC: H04W52/24 ,  H04W52/26 ,  H04W74/08 ,  H04W52/22 ,  H04B7/08

Abstract: Techniques are described for contention-based wireless communications channel access that may improve the likelihood that a contention procedure will pass and allow a device to transmit an uplink or downlink transmission using the contention-based channel. Various disclosed techniques may determine a transmit power for a subsequent transmission based on channel characteristics during one or more clear channel assessment (CCA) time durations. The transmit power may be selected to provide a CCA threshold that may increase the likelihood that a device will win contention for the channel during the CCA procedure.

公开(公告)号：US20180278403A1

公开(公告)日：2018-09-27

申请号：US15926563

申请日：2018-03-20

Applicant: QualComm Incorporated

Inventor： Srinivas Yerramalli ,  Peter Gaal ,  Juan Montojo ,  Jing Sun

IPC: H04L5/00

CPC classification number: H04L5/0094 ,  H04L5/0044 ,  H04L5/0053 ,  H04L5/0091 ,  H04L5/0092 ,  H04L27/0006 ,  H04W16/14 ,  H04W72/0446 ,  H04W72/14 ,  H04W74/0808 ,  H04W74/0833

Abstract: Techniques provide for identification of a starting location for a transmission that provides a relatively short time period between completion of a successful contention-based access procedure (e.g., a listen before talk (LBT) procedure) and transmission of data between a base station and a user equipment (UE). In the event that an LBT procedure is successfully completed after the start of a subframe, an indication of a transmission may be transmitted at one of a number of predetermined points within the subframe time duration. In some cases, two or more different partial subframe durations may be configured, and one or more different partial subframes may be used for transmissions until the start of a subsequent subframe. An uplink trigger may be transmitted in a partial subframe to indicate one or more of a starting point of the uplink wireless transmission or an ending point of the uplink wireless transmission.