公开(公告)号：US10904908B2

公开(公告)日：2021-01-26

申请号：US15926032

申请日：2018-03-20

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W72/12 ,  H04L1/18 ,  H04L5/00 ,  H04L27/00 ,  H04W76/27 ,  H04W72/04

Abstract: Methods, systems, and devices for wireless communication are described. A base station may transmit downlink control information to a user equipment (UE). The downlink control information may identify a grantless uplink group associated with one or more grantless uplink subframes for the UE. The UE may transmit uplink control information for the one or more grantless uplink subframes associated with the indicated uplink group of the UE. The UE may then transmit grantless uplink data during at least one of the one or more grantless uplink subframes based at least in part on the grantless uplink group associated for the UE and the uplink control information.

公开(公告)号：US10856296B2

公开(公告)日：2020-12-01

申请号：US15980568

申请日：2018-05-15

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tamer Kadous ,  Chih-Hao Liu ,  Mostafa Khoshnevisan

IPC: H04W4/00 ,  H04W72/04 ,  H04L5/00 ,  H04B1/713 ,  H04W76/27 ,  H04W16/14 ,  H04W16/32 ,  H04W68/02 ,  H04W48/12

Abstract: Some techniques described herein assist a user equipment with acquiring and/or reacquiring, from a base station, a dynamic list of channels to be used for frequency hopping when communicating over an unlicensed radio frequency spectrum band, thereby increasing communication reliability and promoting coexistence in the unlicensed radio frequency spectrum band. Some techniques described herein also assist the user equipment in obtaining the list of channels with low latency (e.g., shortly after the list has changed) and with low power consumption. Numerous other aspects are provided.

公开(公告)号：US10784999B2

公开(公告)日：2020-09-22

申请号：US16209538

申请日：2018-12-04

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04L5/00 ,  H04W72/12 ,  H04B1/713 ,  H04W72/04 ,  H04W56/00 ,  H04W48/10 ,  H04W8/00 ,  H04W16/14 ,  H04B1/7136

Abstract: Techniques and apparatuses described herein facilitate narrowband communication within the unlicensed frequency spectrum by simultaneously transmitting (e.g., in adjacent channels) a plurality of anchor channels. For example, a base station may simultaneously transmit at least three anchor channels of 180 kHz each so that the 500 kHz minimum bandwidth requirement is satisfied. Furthermore, the techniques and apparatuses described herein provide discovery reference signal (DRS) structures to cause the different types of DRS to be repeated and/or transmitted on different anchor channels, which improves frequency diversity. Also, a synchronization signal of the anchor channels may be used to indicate a configuration of the anchor channels. Thus, synchronization in the NB-IoT-unlicensed (NB-IoT-u) spectrum is enabled, and efficiency is improved over synchronization using a single anchor channel.

公开(公告)号：US10715210B1

公开(公告)日：2020-07-14

申请号：US16124878

申请日：2018-09-07

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04B1/713 ,  H04B1/7143 ,  H04J1/06 ,  H04B1/7136

Abstract: There is a need for a mechanism that increases the UE's chance of properly receiving the NPSS and/or NSSS when frequency hopping is used for narrowband communications in the unlicensed frequency spectrum. The present disclosure provides a solution by transmitting the NPSS and NSSS using a synchronization signal repetition pattern in order to increase the detection probability for the DRS, so that synchronization and/or cell acquisition may be achieved with a reduced number of visits to the anchor channel, thereby reducing synchronization delay and increasing the QoS.

公开(公告)号：US20200220649A1

公开(公告)日：2020-07-09

申请号：US16824971

申请日：2020-03-20

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04L1/00 ,  H04L5/00 ,  H04W72/04 ,  H04W4/70 ,  H04W16/14

Abstract: Some techniques and apparatuses described herein may be used to avoid or reduce collisions between uplink data communications and uplink control communications for an enhanced machine-type communication user equipment (eMTC UE) operating in an unlicensed radio frequency spectrum band. Furthermore, some techniques and apparatuses may avoid such collision while still allowing efficient use of resources, such as by deferring the uplink data communication within a data segment, rate matching an uplink data communication around uplink control resources (e.g., cell-specific uplink control resources and/or UE-specific uplink control resources), puncturing the uplink data communication to avoid the uplink control resources, multiplexing uplink control information on an uplink data channel, and/or the like.

公开(公告)号：US10707915B2

公开(公告)日：2020-07-07

申请号：US16128154

申请日：2018-09-11

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04B1/7143 ,  H04L5/00 ,  H04B1/7136 ,  H04W16/14 ,  H04B1/713 ,  H04W48/16 ,  H04L27/26

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. In one example, the apparatus may be a base station. In certain configurations, the apparatus may transmit information indicating a narrowband frequency hopping pattern to at least one UE. In certain aspects, the narrowband frequency hopping pattern may correspond to a plurality of frames. In certain other aspects, the plurality of frames may include at least one non-anchor channel and being associated with a plurality of anchor channels. The apparatus may communicate with the at least one UE using the narrowband frequency hopping pattern. In certain aspects, communication on the plurality of anchor channels may occur during the same frames.

公开(公告)号：US10659102B2

公开(公告)日：2020-05-19

申请号：US15884161

申请日：2018-01-30

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Chih-Hao Liu ,  Tamer Kadous

IPC: H04B1/7156 ,  H04B1/7083 ,  H04B1/7087 ,  H04B1/7143 ,  H04B1/713 ,  H04J11/00

Abstract: Described techniques provide for transmission of synchronization signals using frequency hopping across a number of hopping frequencies in unlicensed or shared radio frequency spectrum. A base station may identify a set of hop frequencies for transmitting synchronization signals, and transmit synchronization signals using a hopping pattern over the hop frequencies. A user equipment (UE) seeking to identify the base station may monitor one or more of the hop frequencies to identify one or more synchronization signals on the hop frequency. A system timing may be identified in some cases, and one or more base station IDs may be identified. In some cases, a hop frequency may be monitored for a duration that may span the transmission of two or more synchronization signals of a particular base station, based on a periodicity of synchronization signal transmissions on each hop frequency.

公开(公告)号：US20200084727A1

公开(公告)日：2020-03-12

申请号：US16565333

申请日：2019-09-09

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Seyed Ali Akbar Fakoorian ,  Xiaoxia Zhang ,  Mostafa Khoshnevisan ,  Chih-Hao Liu

IPC: H04W52/14 ,  H04W72/04 ,  H04W24/10 ,  H04W72/12 ,  H04W52/24

Abstract: Methods, systems, and devices for wireless communications are described for uplink power control. A user equipment (UE) in communication with a base station may select a power control configuration for low latency or high reliability communications or semi-persistently scheduled communications. In some cases, a power control configuration may correspond to a reception point in a multi-reception-point environment. In some cases, the power control configuration may indicate a default transmit power for uplink communications. In some cases, a UE may perform, at the physical layer, measurements on a signal received from the base station and use this information to determine or select a transmit power for uplink communications. Selecting the low latency power control configuration may include selecting a set of transmit powers or a step size for transmit power adjustments specific to low latency or high reliability communications or semi-persistently scheduled communications.

公开(公告)号：US10548131B2

公开(公告)日：2020-01-28

申请号：US15635051

申请日：2017-06-27

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tamer Kadous ,  Chih-Hao Liu ,  Chirag Patel ,  Alberto Rico Alvarino

IPC: H04W72/04 ,  H04W4/70 ,  H04L29/08 ,  H04W28/26 ,  H04L5/00 ,  H04W88/02 ,  H04W88/08

Abstract: A method and apparatus for wireless communication in the unlicensed spectrum between an eNB and UEs having different bandwidths, e.g., between a narrowband UE and a wideband eNB. A base station apparatus performs an LBT procedure at a beginning of frames and transmits a plurality of repetitions of a transmission. When the plurality of repetitions span multiple frames and the LBT procedure is not successful for a first frame, the base station drops or postpones at least one repetition in the first frame until a second frame when the LBT procedure is successful. A UE receives the plurality of repetitions and may combine a plurality of repetitions across multiple frames. The UE may determine whether the base station drops the at least one repetition in the first frame or postpones the at least one repetition in the first frame until a second frame.

公开(公告)号：US10547494B2

公开(公告)日：2020-01-28

申请号：US15697212

申请日：2017-09-06

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Chirag Patel ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04L29/08

Abstract: This disclosure includes methods, systems, and devices for wireless communication. A repetition of symbols may be used to increase a device's ability to synchronize and communicate using unlicensed spectrum. For example, a base station may schedule a frame that includes repetitions, in time or frequency, of a control or data signal. After performing a listen-before-talk (LBT) procedure, the base station may broadcast or transmit the frame to one or more devices, such as a user equipment (UE). For instance, the frame may include repetitions of a discovery reference signal (DRS), and be broadcast by the base station to enable synchronization by the UE. In other examples, the signal may include repetitions of a cell-specific reference signal (CRS), and a UE may identify a start of a transmission opportunity using the CRSs. Other signals, such as downlink control and shared channels, may be repeated within a frame in a similar manner.