公开(公告)号：US20190313260A1

公开(公告)日：2019-10-10

申请号：US16372917

申请日：2019-04-02

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Zhifei Fan ,  Jing Sun ,  Andrei Dragos Radulescu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W16/26

Abstract: Wireless communications systems and methods related to on-demand cell coverage extension for broadcast signals are provided. A first wireless communication device communicates, with a second wireless communication device, a first extended cell coverage request. The first wireless communication device communicates, with the second wireless communication device, a first broadcast communication signal in an extended cell coverage mode in response to the first extended cell coverage request. The first broadcast communication signal includes a system information block repeated in at least one of a time domain or a frequency domain.

公开(公告)号：US20190306881A1

公开(公告)日：2019-10-03

申请号：US16365505

申请日：2019-03-26

Applicant: QUALCOMM Incorporated

Inventor： Seyed Ali Akbar Fakoorian ,  Xiaoxia Zhang ,  Srinivas Yerramalli ,  Chih-Hao Liu ,  Tamer Kadous

IPC: H04W74/08 ,  H04L27/26 ,  H04L5/00 ,  H04W76/27

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may perform a transmission detection procedure on each base station before combining control information. The UE may use demodulation reference signals (DMRS) as a detection mechanism. If the UE detects a DMRS from a base station, the UE may determine that a control resource set associated with the base station is valid for combining. If the UE does not detect DMRS from the base station, the UE may refrain from combining control information from the base station. In another example, base stations that pass a listen-before-talk (LBT) pr6ocedure may transmit a preamble before transmitting control information. A preamble may carry a preamble sequence associated with a specific control resource set. The UE may identify a preamble sequence and determine that the corresponding control resource set is valid for control information combining.

公开(公告)号：US10419157B2

公开(公告)日：2019-09-17

申请号：US15913739

申请日：2018-03-06

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Aleksandar Damnjanovic ,  Marco Papaleo ,  Rahul Malik ,  Peter Gaal

IPC: H04L1/00 ,  H04W16/14 ,  H04W74/08 ,  H04W88/06 ,  H04L1/18 ,  H04W72/12

Abstract: Techniques are described for wireless communication. A first method includes sensing an indication of first radio access technology (RAT) communications occupying a shared radio frequency spectrum band; and configuring, in response to the sensing, at least one parameter of a second RAT used by a device to contend for access to the band. A second method includes randomly selecting a number from a range of numbers extending between a lower bound and an upper bound; contending for access to a shared radio frequency spectrum band by performing an extended clear channel assessment (ECCA) procedure over a plurality of CCA slots, the plurality of CCA slots including a first number of CCA slots equal to the upper bound; and winning contention for access to the band after determining, while performing the ECCA procedure, that the band is available for a second number of CCA slots equal to the randomly selected number.

公开(公告)号：US10397915B2

公开(公告)日：2019-08-27

申请号：US15460215

申请日：2017-03-15

Applicant: QUALCOMM Incorporated

Inventor： Seyedkianoush Hosseini ,  Srinivas Yerramalli ,  Wanshi Chen ,  Jing Sun ,  Hao Xu ,  Shimman Arvind Patel

IPC: H04L1/18 ,  H04L5/00 ,  H04L5/14 ,  H04W8/22 ,  H04L27/00 ,  H04L27/26 ,  H04W16/14 ,  H04W24/10 ,  H04W72/04 ,  H04W72/12 ,  H04W74/08

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit uplink (UL) messages in unlicensed spectrum with a reduced UL timing delay. The UL timing delay may be reduced by using a shortened transmission time interval (TTI) (e.g., a TTI that is reduced in duration relative to other TTIs in the system or in a legacy system) or by reducing the number of TTIs between a grant and the corresponding UL message. The reduced UL timing delay may decrease the likelihood that the UE will wait for a subsequent transmit opportunity (TxOp) to transmit the UL message. In some cases, the reduced UL timing delay corresponds to a reduced hybrid automatic repeat request (HARQ) processing delay. In some cases, a time difference (e.g., measured in TTIs) between a measurement reference TTI a corresponding channel state information (CSI) report may also be reduced.

公开(公告)号：US20190261210A1

公开(公告)日：2019-08-22

申请号：US16276079

申请日：2019-02-14

Applicant: QUALCOMM Incorporated

Inventor： Qingjiang Tian ,  Srinivas Yerramalli ,  Jing Sun ,  Xiaoxia Zhang ,  Chih-Hao Liu

IPC: H04W28/02 ,  H04W72/12 ,  H04W72/04 ,  H04L12/807

Abstract: Base station contention window update procedures with autonomous uplink (AUL) in a transmission opportunity (TxOP) is discussed. After acquiring a channel and scheduling the TxOP, a base station may transmit control signals to manage communications with served user equipments (UEs). Management of AUL communications in addition to update of the contention window may be determined based on whether the base station has either or both downlink data and scheduled uplink (SUL) transmissions scheduled for the TxOP. Where both downlink and SUL are scheduled, AUL transmissions are allowed, but update of the contention window uses feedback based on the downlink transmissions. Where SUL are scheduled, but no downlink data, AUL are allowed and the contention window is updated using performance information on the uplink transmissions. Finally, where neither data nor SUL are scheduled, the base station deactivate any AUL resources for the TxOP and will refrain from updating the contention window.

公开(公告)号：US10383114B2

公开(公告)日：2019-08-13

申请号：US15400285

申请日：2017-01-06

Applicant: QUALCOMM Incorporated

Inventor： Libin Jiang ,  Shailesh Patil ,  Peter Gaal ,  Srinivas Yerramalli

IPC: H04W72/04 ,  H04L12/807 ,  H04W40/24 ,  H04W74/08

Abstract: Improvement in co-existence of the LTE device-to-device communication with another device-to-device communication method is desired. The apparatus selects a countdown number within a size of a contention window including a plurality of slots before a target subframe. The apparatus determines whether each slot of the plurality of slots is idle or utilized while waiting for the target subframe. The apparatus counts down the countdown number during each of the determined idle slots. The apparatus determines whether the countdown number has reached a threshold number before the target subframe. The apparatus performs, when the countdown number is determined to have reached the threshold number, one of: deferring from transmitting until the target subframe, or transmitting a CUBS until a next subframe or the target subframe.

公开(公告)号：US20190239222A1

公开(公告)日：2019-08-01

申请号：US16382619

申请日：2019-04-12

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Peter Gaal ,  Juan Montojo ,  Tao Luo ,  Wanshi Chen

IPC: H04W72/04 ,  H04L5/00 ,  H04L1/18 ,  H04W72/12 ,  H04W72/14 ,  H04W28/02 ,  H04W74/08 ,  H04W74/00 ,  H04W68/00 ,  H04L1/00 ,  H04W16/14 ,  H04W52/02 ,  H04W52/14 ,  H04W52/36 ,  H04W56/00

Abstract: Techniques are described for wireless communication. One method includes detecting a first reference signal received from a user equipment (UE) in a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) received over a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; determining a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band; and transmitting an indication of the determined contention window size to the UE.

公开(公告)号：US10362575B2

公开(公告)日：2019-07-23

申请号：US15837463

申请日：2017-12-11

Applicant: QUALCOMM incorporated

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

IPC: H04W72/00 ,  H04W72/04 ,  H04L27/26 ,  H04W74/08 ,  H04W72/12

Abstract: Techniques for wireless communications over a shared radio frequency spectrum band, may include techniques for transmitting uplink data transmissions using allocated uplink resources. Allocated uplink resources may include an uplink channel comprising a number of allocated interlaces of resource blocks (RBs) for use by a user equipment (UE). An incoming data stream may be processed and data separated into each of the allocated interlaces of RBs for the UE. Such separation may be through demultiplexing the data stream to obtain data for the allocated interlaces of RBs. The demultiplexed data may be mapped onto associated resource elements associated with the allocated interlaces of RBs, and transmitted. Different types of uplink channels, such as a physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH) and/or a physical random access channel (PRACH) may be allocated to interlaces of RBs in one or more subframes of a transmitted radio frame.

公开(公告)号：US10349293B2

公开(公告)日：2019-07-09

申请号：US15098128

申请日：2016-04-13

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Aleksandar Damnjanovic

IPC: H04W24/08 ,  H04W76/27 ,  H04W72/04 ,  H04W72/08 ,  H04W72/14 ,  H04W74/08 ,  H04W24/02 ,  H04W74/00 ,  H04W84/12 ,  H04W88/02 ,  H04W16/14

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. An eNB determines a CCA parameter for use by a UE in performing a CCA procedure for UL transmission and transmits an indication of the CCA parameter to the UE. The UE receives an indication of the CCA parameter for UL transmission from the eNB and performs the CCA procedure for UL transmission using the indicated CCA parameter. The UE may transmit to the eNB prior to receiving the indication of the CCA parameter. The eNB may use the report in determining the CCA parameter for use by the UE.

公开(公告)号：US10342044B2

公开(公告)日：2019-07-02

申请号：US15630689

申请日：2017-06-22

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Wanshi Chen ,  Jing Sun ,  Peter Gaal

IPC: H04W74/08 ,  H04W16/14 ,  H04W28/02 ,  H04W76/28 ,  H04W72/02

Abstract: Various aspects described herein relate to reducing transmission latency in unlicensed spectrum. These latency reduction techniques include enabling ultra low latency (ULL) traffic to gain fast channel access. These latency reduction techniques further include updating a size of a contention window for channel access. In addition, these latency reduction techniques include enhancing CPDCCH-based signaling to accommodate the ULL frame structure. Further, these latency reduction techniques include providing robust operation against bursty interference for ULL transmissions. Moreover, these techniques include managing DRX for ULL. Additionally, these latency reduction techniques include joint scheduling of different TTI durations. These latency reduction techniques further include updating SRS transmission opportunities. In addition, these latency reduction techniques include reducing latency associated with PRACH transmissions. Further, these latency reduction techniques include reducing ULL transmission delays by either ignoring or cancelling scheduled uplink (e.g., LTE) transmissions.