公开(公告)号：US11381981B2

公开(公告)日：2022-07-05

申请号：US16745281

申请日：2020-01-16

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Xiaoxia Zhang ,  Tao Luo ,  Arumugam Chendamarai Kannan ,  Vinay Chande

IPC: H04B7/06 ,  H04W16/14 ,  H04W16/28 ,  H04W72/08 ,  H04W72/04 ,  H04W74/08

Abstract: Methods, systems, and devices for wireless communications are described. In some systems, wireless devices operating in an unlicensed radio frequency spectrum band may perform directional listen-before-talk (LBT) procedures to gain access to a channel. In a beam-shrinking scheme for directional LBT, a wireless device may start an LBT procedure using a first beam (e.g., a wide beam). If the clear channel assessment (CCA) fails for the first beam (e.g., due to directional interference), the device may switch the LBT procedure to a second beam (e.g., a narrower beam). Depending on the direction of the interference source, the second beam may result in a successful LBT procedure. In a beam sweeping scheme for directional LBT, a wireless device may perform concurrent LBT over multiple narrow beams. If any beam of the set of beams detects frequent or continuous interference, the device may drop that beam from the concurrent LBT procedure.

公开(公告)号：US20210298074A1

公开(公告)日：2021-09-23

申请号：US17249732

申请日：2021-03-10

Applicant: QUALCOMM INCORPORATED

Inventor： Sungwoo Park ,  Arumugam Chendamarai Kannan ,  Srinivas Yerramalli ,  Xiaoxia Zhang ,  Jing Sun ,  Vinay Chande ,  Tao Luo ,  Aleksandar Damnjanovic ,  Giovanni Chisci

IPC: H04W74/08 ,  H04B17/336

Abstract: Wireless communications systems and methods related to communications in a network are provided. A first wireless communication device may communicate to a second wireless communication device, a modification to a time parameter associated with at least one of a minimum idle period (MIP) of a frame period or a maximum channel occupancy time (MCOT) of the frame period. Additionally, the first wireless communication device may communicate with the second wireless communication device, a communication signal during the frame period based on the modification to the time parameter.

公开(公告)号：US20210298073A1

公开(公告)日：2021-09-23

申请号：US17198811

申请日：2021-03-11

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Arumugam Chendamarai Kannan ,  Vinay Chande ,  Jing Sun ,  Xiaoxia Zhang ,  Tao Luo

IPC: H04W74/08 ,  H04W16/14

Abstract: A proxy sensing-based channel access procedure is discussed for shared spectrum networks. Within a given network, a distribution of proxy nodes may be deployed around a network operating area. A control node, which controls the proxy sensing mode for the network, may configure the active network nodes to conduct communications via the shared communication spectrum without first performing any type of channel sensing on the shared communication spectrum. The control node may then also configured the proxy nodes to perform channel sensing on the shared spectrum for the entire network. Using the reported channel sense results from the proxy nodes, the control node may determine whether detected interference is occasional or persistent, and whether to take some action to modify the communications or operations of the network.

公开(公告)号：US20210250774A1

公开(公告)日：2021-08-12

申请号：US17167024

申请日：2021-02-03

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Arumugam Chendamarai Kannan ,  Tao Luo ,  Vinay Chande ,  Jing Sun ,  Xiaoxia Zhang

IPC: H04W16/14 ,  H04W74/08 ,  H04W56/00 ,  H04W76/27 ,  H04W80/02 ,  H04W72/00

Abstract: Methods, systems, and devices for wireless communications are described for silencing signal transmissions by a user equipment (UE). Silencing signals may be transmitted periodically during shared spectrum downlink communications from a serving base station to the UE to prevent an interfering node from passing a listen before talk (LBT) procedure. The silencing signal transmissions may be configured by the base station and enabled in cases where potential interfering nodes are detected. An interfering node may be notified that silencing signals are being used, and may adjust a periodicity or wait time of its LBT procedures based on the silencing signal periodicity.

公开(公告)号：US20210227478A1

公开(公告)日：2021-07-22

申请号：US17248231

申请日：2021-01-14

Applicant: QUALCOMM Incorporated

Inventor： Vinay Chande ,  Arumugam Chendamarai Kannan ,  Srinivas Yerramalli ,  Xiaoxia Zhang ,  Tao Luo

IPC: H04W52/38 ,  H04W52/24

Abstract: Wireless communications systems and methods related to listen-before-talk (LBT) are provided. A first wireless communication device performs an LBT in a channel to contend for a first transmission opportunity (TXOP). The first wireless communication device receives, from a second wireless communication device, a first reservation signal reserving a second TXOP in the channel in response to the LBT, the second TXOP being different from the first TXOP. The first wireless communication device adjusts a signal detection threshold based on transmit power information associated with at least one of the first wireless communication device, the second wireless communication device, first data traffic to be communicated in the first TXOP, or second data traffic to be communicated in the second TXOP. The first wireless communication device determines whether to yield channel access during the second TXOP based on a signal measurement of the first reservation signal and the adjusted signal detection threshold.

公开(公告)号：US20210219335A1

公开(公告)日：2021-07-15

申请号：US17105321

申请日：2020-11-25

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Mostafa Khoshnevisan ,  Wooseok Nam ,  Tao Luo ,  Jing Sun ,  Sungwoo Park ,  Arumugam Chendamarai Kannan ,  Vinay Chande ,  Hua Wang ,  Yongbin Wei

IPC: H04W74/00 ,  H04W76/28 ,  H04W52/02

Abstract: Methods, systems, and devices for wireless communications are described. A base station may configure a user equipment (UE) with a multiple listen-before-talk (LBT) bandwidths, where each LBT bandwidth is associated with one or more downlink control channel candidates of a search space for a control resource set. The UE may monitor the LBT bandwidths during a wakeup signal period for a wakeup signal from the base station. The UE may be configured with a total number of blind hypotheses in the set of blind hypotheses which is equal to or greater than a total number of LBT bandwidths. The UE may determine whether to wake up and monitor an on duration of a discontinuous reception cycle based on detection of the wakeup signal.

公开(公告)号：US20210160918A1

公开(公告)日：2021-05-27

申请号：US17098303

申请日：2020-11-13

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Arumugam Chendamarai Kannan ,  Vinay Chande ,  Xiaoxia Zhang ,  Tao Luo

IPC: H04W72/14 ,  H04W72/04 ,  H04W72/08 ,  H04L5/00

Abstract: This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for frame based operation and medium contention procedures in wireless networks. In some aspects, devices of a wireless network may perform receiver side contention operations. To illustrate, reference signals from a receiving device may be transmitted to a transmitting device and used by the transmitting device to estimate interference for transmitter side transmissions. Such receiver side reference signals may more accurately reflect the interference profile that transmissions sent by the transmitting device will face, such as when operating in a spectrum shared with many devices. The transmitting device may utilize the beam(s) that satisfy interference criteria when receiving the reference signals to transmit data. Receiver side frame based operation may provide a more stable interference profile which enables better rate prediction, and the better rate prediction may increase reliability and overall network and medium throughput.

公开(公告)号：US10945288B2

公开(公告)日：2021-03-09

申请号：US16164425

申请日：2018-10-18

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Vinay Chande ,  Tamer Kadous

IPC: H04W74/08 ,  H04W74/00 ,  H04W16/14 ,  H04W72/12 ,  H04W88/06 ,  H04W88/10 ,  H04W76/28 ,  H04L5/22

Abstract: Methods, systems, and devices for wireless communications are described. A contending wireless device may transmit a reservation request signal on the channel during a gap period associated with the channel. The contending wireless device may monitor for a reservation challenge signal resource associated with the gap period for a reservation challenge signal. A challenging wireless device may receive the reservation request signal and determine an interference risk based at least in part on the reservation request signal. The challenging wireless device may transmit a reservation challenge signal over a reservation challenge signal resource associated with the gap period based at least in part on the determination. The contending wireless device may selectively perform a transmission on the channel based at least in part on a result of the monitoring.

公开(公告)号：US10834690B2

公开(公告)日：2020-11-10

申请号：US16777326

申请日：2020-01-30

Applicant: QUALCOMM Incorporated

Inventor： Arumugam Chendamarai Kannan ,  Vinay Chande ,  Xiaoxia Zhang ,  Tao Luo ,  Jing Sun ,  Makesh Pravin John Wilson

IPC: H04W72/04 ,  H04W56/00 ,  H04W16/28 ,  H04W74/08 ,  H04W24/08

Abstract: Methods, systems, and devices for wireless communications are described that provide staggered synchronization signal blocks (SSBs) in frequency sub-bands for beamformed wireless communications. Transmissions of SSBs and control channel transmissions (e.g., remaining minimum system information (RMSI) physical downlink control channel (PDCCH) transmissions) may use multiple transmission beams in a beam sweeping procedure. The SSB transmissions may be transmitted using transmission beams that span one frequency sub-band of a number of available frequency sub-bands, and the control channel transmissions may use transmission beams that span two or more of the frequency sub-bands. The SSB beam sweeping procedure may be performed separately during staggered, non-overlapping time periods for each frequency sub-band of the number of frequency sub-bands. Each of the of SSBs may indicate a reference timing of the base station used to identify a set of resources (e.g., a control resource set (CORESET)) that carries control channel transmissions.

公开(公告)号：US20200245371A1

公开(公告)日：2020-07-30

申请号：US16773825

申请日：2020-01-27

Applicant: QUALCOMM Incorporated

Inventor： Vinay Chande ,  Xiaoxia Zhang ,  Tao Luo ,  Arumugam Chendamarai Kannan ,  Jing Sun ,  Makesh Pravin John Wilson ,  Ozcan Ozturk

IPC: H04W74/08 ,  H04W76/10 ,  H04W72/04 ,  H04W72/14

Abstract: A user equipment (UE) may transmit a random access request message to a base station in a random access procedure to access a wireless network. In response, the base station may transmit a random access response message to the UE including an uplink grant for a first set of uplink resources for the UE to transmit a radio resource control (RRC) message. The UE may determine a second set of uplink resources for transmitting the RRC message, for example, based on additional uplink grants received in the random access response message. Additionally or alternatively, the UE may derive additional grants implicitly from the first uplink grant received from the base station. The UE may transmit the RRC message to the base station using the first and/or second sets of uplink resources and establish a connection based on the RRC message for subsequent uplink and downlink communications.