公开(公告)号：US20200084759A1

公开(公告)日：2020-03-12

申请号：US16563730

申请日：2019-09-06

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao Liu ,  Seyed Ali Akbar Fakoorian ,  Srinivas Yerramalli ,  Qingjiang Tian ,  Andrei Dragos Radulescu ,  Tamer Kadous

IPC: H04W72/04 ,  H04W72/08 ,  H04L5/00 ,  H04W24/10

Abstract: Generally, the described techniques provide for a base station transmitting an indication of a set of one or more available channels to a user equipment (UE). The base station may transmit to the UE a first downlink burst using a first channel and a first frame period. In some cases, the base station may detect interference associated with the first downlink burst, for example, by performing a listen-before-talk (LBT) procedure or through an interference management resources (IMR) procedure in which the base station transmits reference signal signals to the UE that the UE may use to return a report on measured interference. If the base station detects interference, the base station may transmit to the UE an instruction to switch to a second channel and a second frame period, where the second channel may be selected from the set of one or more available channels.

公开(公告)号：US10542436B2

公开(公告)日：2020-01-21

申请号：US15644517

申请日：2017-07-07

Applicant: QUALCOMM Incorporated

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

IPC: H04W16/14 ,  H04W4/70 ,  H04W76/28 ,  H04L5/14 ,  H04W74/08

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) and base station may communicate using narrow band internet of things (NB-IoT) techniques or enhanced machine type communication (eMTC) in unlicensed spectrum. The UE may be an eMTC device or another device capable of communication without user direction. The UE may identify a geographic region and select a communication mode that is consistent with regulatory restrictions in that region. For example, in some cases, the communication mode may be based on using time division duplexing (TDD), using frequency hopping, or performing a listen-before-talk (LBT) procedure at the base station. A frame structure for TDD may include LBT subframes, uplink portions, downlink portions, and special subframes for switching. The base station may perform LBT procedures in the LBT subframes. If frequency hopping is enabled, a configurable number of TDD frames may be grouped into a hopping frame block.

公开(公告)号：US20190320448A1

公开(公告)日：2019-10-17

申请号：US16381277

申请日：2019-04-11

Applicant: QUALCOMM Incorporated

Inventor： Seyed Ali Akbar Fakoorian ,  Jing Sun ,  Xiaoxia Zhang ,  Chih-Hao Liu ,  Srinivas Yerramalli

IPC: H04W72/12

Abstract: Some wireless communications systems may support different types of communications between base stations and user equipment (UEs), such as mobile broadband (MBB) communications and low latency communications. Low latency communications may be associated with bursty and unpredictable transmissions. As described herein, to facilitate low latency communications and limit the latency associated with waiting on appropriate resources for transmitting low latency data, a base station may schedule downlink low latency transmissions on uplink resources or uplink low latency transmissions on downlink resources. Further, to limit the latency associated with scheduling low latency communications, a base station may be configured with a carrier for transmitting preemption indications (PIs) to one or more UEs to reassign resources for low latency communications. Similarly, in some cases, a UE may be configured with a carrier to transmit scheduling requests (SRs) to request resources for low latency communications.

公开(公告)号：US20190320424A1

公开(公告)日：2019-10-17

申请号：US16380778

申请日：2019-04-10

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Aleksandar Damnjanovic ,  Xiaoxia Zhang ,  Tamer Kadous ,  Chih-Hao Liu ,  Seyed Ali Akbar Fakoorian ,  Andrei Dragos Radulescu

IPC: H04W72/04 ,  H04L5/00

Abstract: In various aspects, a base station and user equipment (UE) exchange an indication of UE capabilities and a monitoring schedule for the UE to monitor an integer M frequency band partitions for a predetermined signal. The base station performs one or more successful clear carrier assessments (CCAs) on an integer N frequency band partitions of the M frequency band partitions, wherein N

公开(公告)号：US20190238284A1

公开(公告)日：2019-08-01

申请号：US16259992

申请日：2019-01-28

Applicant: QUALCOMM Incorporated

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

IPC: H04L5/00 ,  H04L27/26 ,  H04W72/04

CPC classification number: H04L5/0007 ,  H04L5/0083 ,  H04L27/2666 ,  H04W72/0446

Abstract: Methods, systems, and devices for wireless communications are described. A base station may identify a plurality of downlink carriers for a transmission time interval (TTI), e.g., a subframe. The base station may identify a period of inactivity for one or more of the plurality of downlink carriers during the TTI, which may correspond to one or more orthogonal frequency division multiplexing (OFDM) symbols of the subframe. The base station may transmit narrowband reference signals (NB-RSs) over the one or more carriers during the period of inactivity according to a channel reservation narrowband reference signal (NB-RS) pattern. The channel reservation NB-RS pattern may include a first set of time-frequency resources associated with a baseline NB-RS pattern and a second set of supplemental time-frequency resources associated with a period of inactivity.

公开(公告)号：US10368348B2

公开(公告)日：2019-07-30

申请号：US15353876

申请日：2016-11-17

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Tao Luo ,  Chirag Sureshbhai Patel ,  Tamer Adel Kadous ,  Chih-Hao Liu

IPC: H04W72/04 ,  H04L5/14 ,  H04L5/00

Abstract: Techniques for control channel signaling on a shared communication medium are disclosed. An access point or an access terminal may communicate over a communication medium in accordance with a Time Division Duplex (TDD) frame structure defining a set of subframes that each span a plurality of time-domain symbol periods. The access point may transmit and the access terminal may receive control information via a short Physical Uplink Control Channel (sPUCCH) on one or more of the subframes in a portion of the subframe configured for uplink signaling. The sPUCCH may comprise one or more pilot symbols and one or more payload symbols that collectively occupy a subset of less than all of the symbol periods in each of the one or more subframes.

公开(公告)号：US20190124663A1

公开(公告)日：2019-04-25

申请号：US16160775

申请日：2018-10-15

Applicant: QUALCOMM Incorporated

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

IPC: H04W72/04 ,  H04W76/10

CPC classification number: H04W72/0466 ,  H04L5/0007 ,  H04L5/001 ,  H04L5/0048 ,  H04L5/0053 ,  H04L25/03866 ,  H04L27/2602 ,  H04L27/2626 ,  H04L27/2647 ,  H04W48/12 ,  H04W72/0406 ,  H04W72/0446 ,  H04W76/10 ,  H04W88/02 ,  H04W88/08

Abstract: Methods, systems, and devices for wireless communications are described. In some wireless networks (e.g., MulteFire networks), a base station may transmit control information to a user equipment (UE) to enable the UE to access the network and establish a connection with the network. The base station may transmit the control information to the UE in search spaces of an enhanced physical downlink control channel (ePDCCH). In some cases, resources used to transmit control information in a first common search space of the ePDCCH may overlap with resources used to transmit control information in a second common search space of the ePDCCH. In such cases, using the techniques described herein, a base station may encode control information transmitted in the different types of search spaces using different scrambling sequences. As such, a UE may be able to differentiate between the control information transmitted in the different types of common search spaces.

公开(公告)号：US10218406B2

公开(公告)日：2019-02-26

申请号：US15637178

申请日：2017-06-29

Applicant: QUALCOMM Incorporated

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

IPC: H04B1/403 ,  H04B1/00 ,  H04B1/26 ,  H04B1/707 ,  H04B7/24 ,  H04B7/26 ,  H04L5/00 ,  H04L27/00 ,  H04W16/14 ,  H04W72/04

Abstract: Methods, systems, and devices for wireless communication are described. Resources for narrowband communication in an unlicensed radio frequency spectrum band may be configured and allocated based on resource availability, regulatory constraints, and device capability or category. A narrowband wireless device, such as a machine type communication device or other relatively low complexity device, may communicate using one or more narrowband carriers, which may occupy between one tone and multiple resource blocks in an unlicensed spectrum band (e.g., any number of resources between one (1) tone and multiple resource blocks (RBs)). Different device types may thus be configured differently as they move between geographic regions. The base station may then communicate with the narrowband mobile device based on the resource allocation and the carrier configuration.

公开(公告)号：US20180309479A1

公开(公告)日：2018-10-25

申请号：US15854380

申请日：2017-12-26

Applicant: QUALCOMM Incorporated

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

IPC: H04B1/7143 ,  H04W8/00 ,  H04L5/00 ,  H04W16/14

CPC classification number: H04B1/7143 ,  H04J3/00 ,  H04L5/0012 ,  H04L5/0055 ,  H04L5/0092 ,  H04L27/0006 ,  H04W8/005 ,  H04W16/10 ,  H04W16/14 ,  H04W48/12

Abstract: Methods, systems, and devices for wireless communication are described that provide for a base station to use frequency hopping for cell acquisition according to a frequency hopping pattern. The frequency hopping pattern may include a set of anchor channels and a set of non-anchor channels used by a base station to communicate with wireless devices. The base station may occupy an anchor channel more often than a non-anchor channel and may transmit acquisition signals using the anchor channel. The anchor channel may also be used by the base station and a user equipment (UE) to exchange paging information, positioning information, random access resources, location of other channels, etc.

公开(公告)号：US20180227944A1

公开(公告)日：2018-08-09

申请号：US15880507

申请日：2018-01-25

Applicant: QUALCOMM Incorporated

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

IPC: H04W72/14 ,  H04W72/12 ,  H04W72/04

CPC classification number: H04W72/14 ,  H04L1/08 ,  H04W28/0215 ,  H04W72/042 ,  H04W72/1268 ,  H04W72/1289 ,  H04W74/0808

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an uplink grant that conveys an indication of a multi-transmission opportunity (TxOP) grant. The UE may transmit, during a first TxOP, a first uplink transmission in one or more subframes in accordance with the multi-TxOP grant. The UE may transmit, during a second TxOP, a second uplink transmission in one or more subframes in accordance with the multi-TxOP grant.