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公开(公告)号：US20170195913A1
公开(公告)日：2017-07-06
申请号：US15248297
申请日：2016-08-26
Applicant: Facebook, Inc.
Inventor： Krishna Gomadam , Djordje Tujkovic , Vish Ponnampalam
CPC classification number: H04J11/0056 , H04J13/0014 , H04J13/16 , H04L2025/03789 , H04L2025/03796
Abstract: Apparatuses, methods, and systems of mitigating packet interference are disclosed. One method includes receiving, by a sector, data to be transmitted over a specific wireless link of a wireless network, configuring a packet for transmission over the specific wireless link, wherein the packet includes a preamble, and the data, and transmitting, by the sector, the configured packet over the specific wireless link. Configuring the packet includes identifying a reference sequence based on the specific wireless link, and inserting the reference sequence into at least a portion of the preamble.
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公开(公告)号：US20170195912A1
公开(公告)日：2017-07-06
申请号：US14986422
申请日：2015-12-31
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic , Sanjai Kohli
CPC classification number: H04W28/04 , H04B7/026 , H04B7/0413 , H04B7/0617 , H04L1/20 , H04W72/082 , H04W84/12
Abstract: The disclosed embodiments seek to improve communication rates and lessen transmission errors between nodes in a communication network. The disclosed embodiments seek to improve reception bandwidth using one or more of (1) a MAC wrapper configured to integrate incoming data across sector arrays for use by the existing chipsets, and/or (2) a new interface modification to the chip design facilitating integrated log likelihood ratio processing from across multiple sector arrays. Sector coverage may be deliberately overlapped using the dynamic diversity achieved by the embodiments to compensate for environmental factors.
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公开(公告)号：US20170195025A1
公开(公告)日：2017-07-06
申请号：US14986471
申请日：2015-12-31
Applicant: Facebook, Inc.
Inventor： Sanjai Kohli , Djordje Tujkovic , Krishna Gomadam
CPC classification number: H04B7/088 , H04B7/063 , H04B7/0695
Abstract: A procedure to establish a link in a directional wireless system where two nodes cannot listen to each other unless optimized beamforming pair is used and timing and framing synchronization is acquired. The procedure determines a set of beamforming pairs that the nodes can use for communication in addition to acquiring the framing and timing synchronization. Training packets are periodically transmitted by a transmitter while a receiver listens in each of a number of receive directions. Training packets are sent N times in N directions while a receiver listens in each of M receive directions until all N×M possible transmit and receive direction pair possibilities are tried. The receiver informs the transmitter which transmit and receive direction pairs were successful in creating communication links between the nodes.
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公开(公告)号：US09584198B1
公开(公告)日：2017-02-28
申请号：US14982589
申请日：2015-12-29
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic
CPC classification number: H04W56/003 , H04B7/0413 , H04B7/0617 , H04B17/11 , H04B17/14 , H04B17/30 , H04B17/3911 , H04L5/0023 , H04L5/0048 , H04L5/005 , H04W4/20
Abstract: Systems and associated methods for reciprocity calibration of multiple-input multiple-output (MIMO) wireless communication are disclosed herein. In one embodiment, a method for reciprocity calibration of the MIMO system includes transmitting a pilot symbol by a transmitter (TX) of the reference antenna and receiving the pilot symbol by receivers (RXes) of antennas of a base station as ri,0 pilot symbols. (Index “i” denotes individual antenna “i” of the base station, and “0” denotes the reference antenna.) The method further includes transmitting the received pilot symbols by TXes of the antennas of the base station, receiving the pilot symbols transmitted by the antennas of the base station by the reference antenna as r0,i pilot symbols, and calculating non-reciprocity compensation factors as r i , 0 r 0 , i .
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公开(公告)号：US11251850B1
公开(公告)日：2022-02-15
申请号：US16877857
申请日：2020-05-19
Applicant: Facebook, Inc.
Inventor： Brian Dunn , Krishna Gomadam , Djordje Tujkovic
IPC: H04B7/06 , H04B7/08 , H04B17/336
Abstract: Apparatuses, methods, and systems for coordinated beamforming in a wireless mesh network, are disclosed. One system includes a network that includes a plurality of nodes connected through wireless links, and a controller. The wireless links including aggressor links and victim links wherein the aggressor links interfere with the victim links. The controller is operative to identify the aggressor links and the victim links of a group of nodes of the plurality of nodes, coordinate beam scans of aggressor transmitter nodes associated with the aggressor links, coordinate reception of one or more victim receive nodes associated with the victim links, characterize or receive characterizations of measured interference at the one or more victim receive nodes during the coordinated beam scans, and select beamforming coefficients for the aggressor transmitter nodes based at least on the characterizations of the measured interference.
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Patent Agency Ranking
公开(公告)号：US20200329418A1
公开(公告)日：2020-10-15
申请号：US16913405
申请日：2020-06-26
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic
Abstract: In one embodiment, an interference-management system of a multi-hop wireless network may access an interference map indicating interference among a plurality of network nodes of the multi-hop wireless network. The interference-management system may determine, for a first pair of network nodes of the multi-hop wireless network, a plurality of adjustments to one or more beamforming weights associated with beamforming antennae of the first pair of network nodes to reduce interference among the network nodes of the multi-hop wireless network, wherein the plurality of adjustments correspond to a respective plurality of communication paths connecting the first pair of network nodes on the multi-hop wireless network. The interference-management system may exclude one or more adjustments from the plurality of adjustments based on a determination that the one or more adjustments correspond to one or more unsuitable communication paths, respectively.
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公开(公告)号：US10805170B1
公开(公告)日：2020-10-13
申请号：US16355776
申请日：2019-03-17
Applicant: Facebook, Inc.
Inventor： Fan Sun , Yanzi Zhu , Ying Li , Djordje Tujkovic
Abstract: Apparatuses, methods, and systems for monitoring performance of a wireless network and assigning sectors of nodes of the wireless network are disclosed. A method includes monitoring a performance of links between sectors of wireless nodes of the wireless network, assigning or reassigning sectors of the wireless nodes to operate in a first mode based on the monitored performance of the links, wherein all of the sectors operating in the first mode are configured to transmit signals or simultaneously receive signals, and assigning or reassigning sectors of the plurality of wireless nodes to operate in a second mode based on the monitored performance of the links, wherein all of the sectors operating in the second mode are configured to transmit signals when all of the sectors operating in the first mode are receiving signals, or receive signals when all of the sectors operating in the first mode are transmitting signals.
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公开(公告)号：US10574330B2
公开(公告)日：2020-02-25
申请号：US16147630
申请日：2018-09-29
Applicant: Facebook, Inc.
Inventor： Sanjai Kohli , Djordje Tujkovic , Krishna Gomadam
Abstract: A procedure to establish a link in a directional wireless system where two nodes cannot listen to each other unless optimized beamforming pair is used and timing and framing synchronization is acquired. The procedure determines a set of beamforming pairs that the nodes can use for communication in addition to acquiring the framing and timing synchronization. Training packets are periodically transmitted by a transmitter while a receiver listens in each of a number of receive directions. Training packets are sent N times in N directions while a receiver listens in each of M receive directions until all N×M possible transmit and receive direction pair possibilities are tried. The receiver informs the transmitter which transmit and receive direction pairs were successful in creating communication links between the nodes.
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公开(公告)号：US10548030B2
公开(公告)日：2020-01-28
申请号：US16277958
申请日：2019-02-15
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic
Abstract: In one embodiment, one or more computing systems of a multi-hop wireless network may access operational parameters for network nodes of the multi-hop wireless network, wherein the multi-hop wireless network comprises a plurality of network nodes, wherein each network node of the plurality of network nodes previously established one or more wireless connections with one or more corresponding network nodes, respectively, and wherein the operational parameters are based on operating data recorded during a period of steady-state operation of the multi-hop wireless network. The one or more computing systems may identify one or more responder nodes from the plurality of network nodes, wherein, for each identified responder node, one or more of the previously established wireless connections has been reset. The one or more computing systems may adjust operational settings for each responder node based on the accessed operational parameters.
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公开(公告)号：US20190289645A1
公开(公告)日：2019-09-19
申请号：US16431618
申请日：2019-06-04
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic , Krishna Gomadam , Sanjai Kohli
Abstract: Apparatuses, methods, and systems of a node that supports a simultaneous bidirectional wireless link with a second node are disclosed. One embodiment of the node includes a first transceiver operative to form a beam directed to a first sector of a second node, and a second transceiver operative to form a beam directed to a second sector of the second node, wherein for at least some time slots a simultaneous bidirectional wireless link is formed between the node and the second node by the one of the first transceiver or the second transceiver transmitting a first communication signal to the second node while the other of the first transceiver or the second transceiver is receiving a second communication signal from the second node, and selecting between forming the simultaneous bidirectional wireless link or a non-simultaneous bidirectional wireless link based on a throughput or a link quality.
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