公开(公告)号：US10368372B2

公开(公告)日：2019-07-30

申请号：US15404171

申请日：2017-01-11

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Tao Luo ,  Chirag Patel ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04L1/18 ,  H04W74/08 ,  H04W72/04 ,  H04W72/14 ,  H04W74/00

Abstract: Techniques for performing listen before talk (LBT) channel contention procedures in a shared radio frequency spectrum band are provided. The LBT techniques may include a shortened LBT procedure that may be selected if a base station has reserved a shared channel for a duration of expected user equipment (UE) uplink transmissions, and a full LBT procedure that may be selected if the base station has not reserved the channel for the duration of expected UE uplink transmissions. The shortened LBT procedure may include detecting energy levels of the channel for a relatively short time period relative to the full LBT procedure. The shortened LBT procedure may be selected if a time period between a UE receiving a grant of uplink resources and the beginning of the uplink resources is less than a threshold time value.

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：US20190110317A1

公开(公告)日：2019-04-11

申请号：US16129473

申请日：2018-09-12

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Taesang Yoo ,  Siddhartha Mallik ,  Aleksandar Damnjanovic ,  Tamer Kadous

IPC: H04W74/08

Abstract: Wireless communications systems and methods related to performing random backoff over multiple spatial dimensions in spatial listen-before-talk (LBT) procedures are provided. A first wireless communication device determines a first backoff counter for contending for a transmission opportunity (TXOP) in a communication medium over a first spatial subspace. The first wireless communication device detects a transmission in the TXOP within the first spatial subspace. The first wireless communication device determines a second backoff counter for contending for the TXOP over a second spatial subspace that is different from the first spatial subspace based on the detecting. The second spatial subspace is part of the first spatial subspace and the detected transmission is in a different spatial subspace than the second spatial subspace.

公开(公告)号：US20190110208A1

公开(公告)日：2019-04-11

申请号：US16154537

申请日：2018-10-08

Applicant: QUALCOMM Incorporated

Inventor： Yisheng Xue ,  Siddhartha Mallik ,  Weiliang Zeng ,  Aleksandar Damnjanovic ,  Tamer Kadous

IPC: H04W16/10 ,  H04W48/20 ,  H04W48/16 ,  H04W48/12 ,  H04W72/12 ,  H04W48/02 ,  H04B17/309

Abstract: Methods, systems, and devices for wireless communications are described. An access point of a secondary cluster may identify a first set of access points of a primary cluster scheduled to perform downlink transmissions over a shared radio frequency spectrum band during a transmission opportunity. The access point may identify a second set of access points and may select a first set of blacklisted stations associated with the secondary cluster for the transmission opportunity. In some cases, the selecting is based on the first set of access points and the second set of access points. The access point may then selectively perform at least one downlink transmission to a second set of stations associated with the secondary cluster during the transmission opportunity. In some examples, the second set of stations is based on the first set of blacklisted stations.

公开(公告)号：US20190104542A1

公开(公告)日：2019-04-04

申请号：US16135500

申请日：2018-09-19

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Ahmed Kamel Sadek ,  Vinay Chande ,  Sanaz Barghi ,  Tamer Kadous

IPC: H04W74/00 ,  H04W72/04

Abstract: Methods, systems, and devices for wireless communications are described. A base station may perform a channel access procedure on a shared radio frequency spectrum band using a first beam configuration. The base station may transmit, based at least in part on successful completion of the channel access procedure, a reservation request message (RRQ) to a user equipment (UE) using a second beam configuration, the second beam configuration comprising a beam width that is equal to or narrower than a beam width of the first beam configuration. The base station may receive a reservation response message (RRS) from the UE in response to the RRQ, the RRS comprising a third beam configuration that is based at least in part on the second beam configuration.

公开(公告)号：US10219252B2

公开(公告)日：2019-02-26

申请号：US15405237

申请日：2017-01-12

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Tao Luo ,  Chirag Patel ,  Tamer Kadous

IPC: H04W4/00 ,  H04W72/04 ,  H04L5/00 ,  H04L1/18 ,  H04L5/14

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a control message during a special subframe of a radio frame. The UE may determine a payload size of the control message according to a radio resource configuration, or the UE may determine a payload size based on a number of bits associated with information to be sent in the control message. The UE may identify uplink resources of the special subframe to use for the control message based on explicit signaling or implicitly based on information to be sent in the control message. Designated resources for control message transmissions in a special subframe may remain the same or may change in subsequent transmission opportunities. The UE may determine to use the same or different resources of a special subframe in a subsequent transmission opportunity depending on when the UE receives downlink messages.

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：US20190014589A1

公开(公告)日：2019-01-10

申请号：US15991591

申请日：2018-05-29

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W72/12 ,  G06F1/32 ,  H04L5/00 ,  H04W52/02

Abstract: Methods, systems, and devices for wireless communication are described. A wireless device may schedule an autonomous uplink (UL) transmission and a scheduled UL transmission during the same time period. The wireless device may determine that it is operating in a limited power state and therefore cannot transmit both the autonomous UL transmission and the scheduled UL transmission. The wireless device may prioritize one of the autonomous UL transmission and the scheduled UL transmission based at least in part on a priority configuration. The wireless device may receive the priority configuration from a base station (e.g., in radio resource control signaling).

公开(公告)号：US20190014481A1

公开(公告)日：2019-01-10

申请号：US16024289

申请日：2018-06-29

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Andrei Dragos Radulescu ,  Tao Luo ,  Tamer Kadous ,  Aleksandar Damnjanovic

IPC: H04W16/14 ,  H04W72/04 ,  H04W74/08 ,  H04L5/00 ,  H04W24/10 ,  H04W72/08 ,  H04W76/27

Abstract: Methods, systems, and devices for wireless communication are described. The described techniques provide for transmission of uplink data from a user equipment (UE) in the absence of scheduled uplink resources for the uplink data transmission that are allocated to the UE prior to the transmission of the uplink data. Various examples provide frame structures that may be used for unscheduled uplink transmissions of a UE. Unscheduled uplink transmissions may be transmitted in a shared or unlicensed radio frequency spectrum, and access to the shared or unlicensed radio frequency spectrum may be determined based on a priority of an operator associated with a UE for accessing the spectrum. Beamforming techniques may be used for uplink and downlink transmissions and beam widths for beamformed transmissions may be selected based on the information transmitted in a transmission, an operator priority for use of shared radio frequency spectrum, or any combination thereof.

公开(公告)号：US20180376503A1

公开(公告)日：2018-12-27

申请号：US15950418

申请日：2018-04-11

Applicant: QUALCOMM Incorporated

Inventor： Jing Sun ,  Xiaoxia Zhang ,  Taesang Yoo ,  Tamer Kadous

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

CPC classification number: H04W74/0808 ,  H04L27/2605 ,  H04L27/2607 ,  H04L27/2646 ,  H04L27/2666 ,  H04W16/14 ,  H04W72/0406 ,  H04W72/0486

Abstract: An asynchronous channel reservation design is disclosed having a partial symbol alignment. The transmitting node performs a listen before talk (LBT) procedure on a transmission channel shared by one or more transmission/reception points (TRPs). Upon detecting passing the LBT, a preamble is transmitted followed by a dynamic length cyclic prefix that includes the normal cyclic prefix plus an additional variable period. The transmitter then transmits the channel reservation message after the dynamic length cyclic prefix. On the detector side, once the preamble is detected, the detecting node assumes a normal cyclic prefix before attempting to detect and decode the channel reservation information in the message. Using a demodulation reference signal (DMRS) in the channel reservation message, the detecting node may detect the channel reservation message information from the shifted version of the detected message.