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公开(公告)号：US11864234B2
公开(公告)日：2024-01-02
申请号：US16917472
申请日：2020-06-30
CPC分类号： H04W74/0833 , H04B7/0617 , H04L1/0003 , H04L5/0007 , H04L5/0048 , H04W52/362 , H04W72/21 , H04W72/0473
摘要： A base station (BS) or a user equipment (UE) performs a channel access procedure for a plurality of beams to determine an availability of the plurality of beams. In some implementations, the BS or the UE determines that a channel access procedure is successful for a subset of the plurality of beams. In such implementations, the BS or the UE performs the transmission on the subset of the plurality of beams.
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公开(公告)号：US11812277B2
公开(公告)日：2023-11-07
申请号：US17167024
申请日：2021-02-03
发明人： Srinivas Yerramalli , Arumugam Chendamarai Kannan , Tao Luo , Vinay Chande , Jing Sun , Xiaoxia Zhang
CPC分类号： H04W16/14 , H04W56/001 , H04W72/30 , H04W74/0816 , H04W76/27 , H04W80/02
摘要： 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.
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公开(公告)号：US11800559B2
公开(公告)日：2023-10-24
申请号：US17170015
申请日：2021-02-08
发明人： Jing Sun , Vinay Chande , Arumugam Chendamarai Kannan , Srinivas Yerramalli , Xiaoxia Zhang , Tao Luo
IPC分类号： H04W74/08 , H04W72/1268 , H04W72/23
CPC分类号： H04W74/0808 , H04W72/1268 , H04W72/23
摘要： Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a grant scheduling an acknowledgement feedback transmission for the grant. The UE may identify, based at least in part on a first timing associated with the grant, a second timing associated with the acknowledgment feedback transmission, or a combination thereof, a duration for a channel clearance procedure to be performed before transmitting the acknowledgement feedback transmission. The UE may perform the channel clearance procedure using the identified duration. The UE may transmit the acknowledgement feedback transmission based at least in part on a result of the channel clearance procedure.
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公开(公告)号：US11764855B2
公开(公告)日：2023-09-19
申请号：US17136204
申请日：2020-12-29
发明人： Srinivas Yerramalli , Arumugam Chendamarai Kannan , Vinay Chande , Jing Sun , Xiaoxia Zhang , Tao Luo
CPC分类号： H04B7/088 , H04B7/0888 , H04L5/0053 , H04W48/02 , H04W72/23 , H04W74/0875
摘要： This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for managing beam selection. In one aspect, an initiating wireless device may determine whether a pre-grant acknowledgement associated with a first beam has been received from a responding wireless device within an expected receive time. The initiating wireless device may generate an indication to prevent the initiating wireless device from using the first beam for a blocking duration in response to determining that the pre-grant acknowledgement associated with the first beam has not been received within the expected receive time.
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公开(公告)号：US20230199839A1
公开(公告)日：2023-06-22
申请号：US18173640
申请日：2023-02-23
发明人： Srinivas Yerramalli , Vinay Chande , Arumugam Chendamarai Kannan , Jing Sun , Xiaoxia Zhang , Tao Luo
CPC分类号： H04W74/0808 , H04L5/0055 , H04W72/21
摘要： A method of wireless communication includes performing, by a user equipment (UE) device, a channel sensing operation during a first window of a frame period associated with a wireless communication network. Performing the channel sensing operation includes performing a direction-based scan of one or more beams associated with the wireless communication network, and the channel sensing operation is included in a joint sensing operation performed with a base station. The method further includes, based at least in part on a result of the channel sensing operation, determining whether to perform, during a second window of the frame period, one or more communication operations with the base station.
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公开(公告)号：US11653345B2
公开(公告)日：2023-05-16
申请号：US17029469
申请日：2020-09-23
IPC分类号： H04W72/04 , H04W72/044 , H04L5/00
CPC分类号： H04W72/046 , H04L5/0048
摘要： This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for selecting a beam to be allocated for transmitting downlink (DL) data to user equipment (UE). In some implementations, a UE receives a reference signal on each of a number of beams associated with a base station, and determines a delay spread value for each beam. The UE identifies each beam for which the determined channel delay spread value is less than a threshold value, and determines a reference signal received power (RSRP) level for each identified beam. The UE transmits an indication of the determined RSRP levels of the identified beams to the base station, and receives, in response to the transmitted indication, a selection of the beam to be allocated for DL transmissions to the UE.
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公开(公告)号：US11510243B2
公开(公告)日：2022-11-22
申请号：US16910830
申请日：2020-06-24
发明人： Srinivas Yerramalli , Arumugam Chendamarai Kannan , Vinay Chande , Xiaoxia Zhang , Tao Luo , Sungwoo Park , Wooseok Nam , Jing Sun , Kaushik Chakraborty , Zhifei Fan , Mostafa Khoshnevisan
摘要： This disclosure provides systems, methods, and apparatuses for a beam-based channel access countdown procedure. In one aspect, a channel sensing beam may be permitted to include one or more transmit beams and, thus, may differ from a transmit beam that is to be used for a transmission. As such, defining a manner in which a channel access countdown procedure is performed is desirable. Some aspects described herein provide techniques and apparatus for a beam-based channel access countdown procedure. In some aspects, the systems, methods, and apparatuses described herein provide a beam-based channel access countdown procedure that allows a single channel sensing beam, including multiple transmit beams, to be utilized in association with determining channel availability for the multiple transmit beams, thereby improving performance of beam-based directional transmissions.
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公开(公告)号：US20220272750A1
公开(公告)日：2022-08-25
申请号：US17249250
申请日：2021-02-24
发明人： Giovanni Chisci , Yisheng Xue , Jing Sun , Arumugam Chendamarai Kannan , Vinay Chande , Xiaoxia Zhang
摘要： Wireless communications systems and methods related to performing contention credit-based listen-before-talk (LBT) for communications over a shared radio frequency band (e.g., in a shared spectrum or in an unlicensed spectrum) are provided. A wireless communication device performs a first clear channel assessment (CCA) including a first countdown. The wireless communication device transmits, after a gap period from the first countdown, a first communication signal. The wireless communication device performs a second CCA including a second countdown. The wireless communication device transmits, beginning before an end of the second countdown, a second communication signal based on at least a first contention credit associated with the gap period.
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公开(公告)号：US20220272548A1
公开(公告)日：2022-08-25
申请号：US17742317
申请日：2022-05-11
摘要： 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.
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10.发明授权公开(公告)号：US11412464B2
公开(公告)日：2022-08-09
申请号：US16720276
申请日：2019-12-19
发明人： Makesh Pravin John Wilson , Tao Luo , Mostafa Khoshnevisan , Jing Sun , Arumugam Chendamarai Kannan , Xiaoxia Zhang , Vinay Chande
摘要： Methods, systems, and devices for wireless communications are described for adjusting transmit powers for concurrent uplink transmissions from a user equipment (UE) to multiple transmission reception points (TRPs), or dropping one or more uplink transmissions to one or more TRPs, based on one or more parameters. A UE may identify that a combined transmission power for concurrent uplink transmissions exceeds a power threshold of the UE, and may adjust a power for one or more of the concurrent uplink transmissions, or drop one or more of the uplink transmissions based on such an identification. If a difference in transmit powers of the concurrent uplink transmissions exceeds a power difference threshold, the UE may drop one or more lower priority transmissions. The UE may multiplex at least a portion of a dropped transmission with another uplink transmission that will be transmitted, such as by rate-matching or puncturing.
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