公开(公告)号：US10924343B1

公开(公告)日：2021-02-16

申请号：US16254355

申请日：2019-01-22

Applicant: Amazon Technologies, Inc.

Inventor： Ashish Kumar Shukla ,  Kiran Kumar Edara ,  Kun Ting Tsai ,  Sarang Wagholikar

IPC: H04L12/24 ,  H04L29/08 ,  H04W84/18

Abstract: Technology for event propagation and action coordination in a mesh network is described. In one embodiment, a master mesh node for a first communication channel in a mesh network receives a first event notification message from a first dependent mesh node associated with the master mesh node. The first event notification message pertains to a first event detected by the first dependent mesh node. In response, the master mesh node generates a first action message specifying a first action associated with the first event and sends the first action message to the first dependent mesh node and to a second dependent mesh node associated with the master mesh node. The master mesh node, the first dependent mesh node, and the second dependent mesh node all exchange communications with each other using the first communication channel in the mesh network.

公开(公告)号：US10574316B1

公开(公告)日：2020-02-25

申请号：US15987684

申请日：2018-05-23

Applicant: Amazon Technologies, Inc.

Inventor： Ravi Ichapurapu ,  Shao-Cheng Wang ,  Vipul Jain ,  Kun Ting Tsai ,  Milos Jorgovanovic ,  Chirag Saurabh Bhavsar ,  Vinay Gotnakodlu Hegde

IPC: H04B7/06 ,  H04W4/80 ,  H04W8/00 ,  H04B17/318 ,  H04W84/12

Abstract: A device includes a first radio controller, a second radio controller, and a processor. The processor is configured to execute instructions for determining that a first signal strength of a signal received from a remote device by a first antenna electrically connected to the first radio controller is less than a minimum signal strength threshold for communications using the first antenna, identifying a network process configured to communicate with a remote device using the first radio controller or the second radio controller, and determining that the processor is not executing the network process. The processor is further configured to execute instructions for, determining a second signal strength of a second signal received from the remote device by a second antenna, determining the second signal strength is greater than the first signal strength, and causing the first radio controller to communicate using the second antenna.

公开(公告)号：US10477585B1

公开(公告)日：2019-11-12

申请号：US16049593

申请日：2018-07-30

Applicant: Amazon Technologies, Inc.

Inventor： Kun Ting Tsai ,  Chirag Bhavsar ,  Huanchun Ye ,  Varadarajan Gopalakrishnan ,  QingYun Wei ,  Morris Hsu ,  James Edwin Christy

IPC: H04W74/08 ,  H04B15/02 ,  G06F3/16

Abstract: Microwave interference mitigation techniques and systems are disclosed herein. In some embodiments, microwave interference mitigation involves coordinating wireless traffic in accordance with a magnetron's on-and-off cycle so that data is not sent during the magnetron's on period, and is exclusively sent during the magnetron's off period. Wireless traffic can be coordinated using a voltage monitoring and zero-crossing point detection technique coupled with a Clear To Send (CTS) packet. For non-microwave devices, wireless traffic coordination can be achieved using a pattern matching algorithm coupled with a Clear Channel Assessment (CCA) threshold adjustment during the magnetron's on-and-off cycles. Additional, or alternative, microwave interference mitigation techniques involve decreasing a maximum packet size for data packets that are to be transmitted wirelessly in the environment, which guarantees successful transmission of data packets during the magnetron's off periods.

公开(公告)号：US11606791B1

公开(公告)日：2023-03-14

申请号：US17317715

申请日：2021-05-11

Applicant: Amazon Technologies, Inc.

Inventor： Kun Ting Tsai ,  Nathan Labadie ,  Cheol Su Kim ,  Sarang Wagholikar ,  Omar Fawazhashim Zakaria

IPC: H04L12/28 ,  H04W72/0453 ,  H04J1/16 ,  H04W84/12

Abstract: Technologies directed to multi-tier coordinated dynamic frequency selection (DFS) service in a multi-tier wireless network are described. One method includes receiving, by a first wireless device, first data associated with a first set of DFS channels. The first wireless device performs a CAC on each DFS channel of the first set of DFS channels in a specified order. The first wireless device identifies a second set of DFS channels in which no radar event is found during the respective CAC and generates second data associated with the second set of DFS channels. The first wireless device receives a first request for the second data from a second wireless device. The first wireless device determines a receive signal strength indicator (RSSI) value associated with the first request and sends a first response, including the second data and the RSSI value, to the second wireless device

公开(公告)号：US11283475B1

公开(公告)日：2022-03-22

申请号：US16353938

申请日：2019-03-14

Applicant: Amazon Technologies, Inc.

Inventor： Kun Ting Tsai ,  Ashish Kumar Shukla

IPC: H04W8/00 ,  H04W84/18 ,  H04B1/10 ,  H04B17/318 ,  H04W28/20 ,  H04W84/12 ,  H04W88/08

Abstract: A wireless access point device includes a radio to establish a communication link on a first primary channel using a wireless local area network (WLAN) protocol. The communication link has an operating channel bandwidth and a communication link bandwidth that is adjustable to be identical to or lower than the operating channel bandwidth. The operating channel bandwidth includes the first primary channel and a plurality of secondary channels. The WAP device is to determine that received data, which contains in-phase and quadrature (I/Q) values, does not include a valid WLAN frame; determine that a first secondary channel of the plurality of secondary channels has an interference signal signature via application of frequency domain analysis on the I/Q sample values; and modify the communication link bandwidth from a first frequency range to a second width frequency range, which does not include the first secondary channel.

公开(公告)号：US11121693B1

公开(公告)日：2021-09-14

申请号：US16744974

申请日：2020-01-16

Applicant: Amazon Technologies, Inc.

Inventor： Nathan Labadie ,  Kun Ting Tsai ,  Cheol Su Kim ,  Kalyan Teja Posani ,  Omar Fawazhashim Zakaria

IPC: H04B17/318 ,  H04W4/80 ,  H03H7/40 ,  H04W76/27 ,  H04W52/02 ,  H04B1/18

Abstract: Technologies directed to a wireless device with RF port impedance detection using concurrent radios are described. One wireless device includes an impedance detection circuit with a bi-directional RF coupler and switching circuitry. A processing device controls the switching circuitry to i) couple the bi-directional RF coupler between a first radio and a first RF port and a second radio and a second RF port. The processing device causes a first radio to send a first signal and a second radio to measure a first receive signal strength indicator (RSSI) value of a first reflected signal. The processing device determines that the first RSSI value exceeds a threshold, the threshold representing an impedance mismatch condition at or beyond the first RF port. The processing device sends a message indicative of the impedance mismatch condition to a second device.

公开(公告)号：US12003400B1

公开(公告)日：2024-06-04

申请号：US17983275

申请日：2022-11-08

Applicant: Amazon Technologies, Inc.

Inventor： Durga Laxmi Narayana Swamy Inti ,  Kun Ting Tsai ,  Ravi Ichapurapu

IPC: H04W80/02 ,  H04B7/06 ,  H04B17/318 ,  H04L43/16 ,  H04W24/08 ,  H04W24/10

CPC classification number: H04L43/16 ,  H04B7/0626 ,  H04B17/318 ,  H04W24/08 ,  H04W24/10

Abstract: Techniques for presence detection are described. In an example, system receives, from a first device connected with a computer network that is associated with a location, a first value of a first parameter associated with a link between the first device and a second device. The system determines, using a first prediction model and the first value, a first likelihood of presence at the location. The first prediction model is configured based at least in part on outputs of a second prediction model that uses a second parameter associated with the computer network. The system determines whether the presence is detected at the location based at least in part on the first likelihood.

公开(公告)号：US11658634B1

公开(公告)日：2023-05-23

申请号：US17400333

申请日：2021-08-12

Applicant: Amazon Technologies, Inc.

Inventor： Nathan Labadie ,  Kun Ting Tsai ,  Cheol Su Kim ,  Kalyan Teja Posani ,  Omar Fawazhashim Zakaria

IPC: H04B17/318 ,  H04W4/80 ,  H03H7/40 ,  H04W52/02 ,  H04W76/27 ,  H04B1/18

CPC classification number: H03H7/40 ,  H04B1/18 ,  H04B17/318 ,  H04W52/0245 ,  H04W76/27

Abstract: Technologies directed to a wireless device with RF port impedance detection using concurrent radios are described. One wireless device includes an impedance detection circuit with a bi-directional RF coupler and switching circuitry. A processing device at least two radios, at least two RF ports, and an impedance detection circuit. The impedance detection circuit is configured to measure a first receive signal strength indicator (RSSI) value of a first reflected signal. The first reflected signal corresponding to a first signal sent by one of the at least two radios. The impedance detection circuit determines that the first RSSI value exceeds a threshold. The threshold represents an impedance mismatch condition at or beyond at least one of the two RF ports. The processing device sends a first indicative of the impedance mismatch condition to a second device.

公开(公告)号：US11539610B1

公开(公告)日：2022-12-27

申请号：US17073055

申请日：2020-10-16

Applicant: Amazon Technologies, Inc.

Inventor： Durga Laxmi Narayana Swamy Inti ,  Kun Ting Tsai ,  Ravi Ichapurapu

IPC: H04W24/08 ,  H04L43/16 ,  H04B7/06 ,  H04W24/10 ,  H04B17/318

Abstract: Techniques for presence detection are described. In an example, system receives, from a first device connected with a computer network that is associated with a location, a first value of a first parameter associated with a link between the first device and a second device. The system determines, using a first prediction model and the first value, a first likelihood of presence at the location. The first prediction model is configured based at least in part on outputs of a second prediction model that uses a second parameter associated with the computer network. The system determines whether the presence is detected at the location based at least in part on the first likelihood.

公开(公告)号：US11483046B1

公开(公告)日：2022-10-25

申请号：US17002328

申请日：2020-08-25

Applicant: Amazon Technologies, Inc.

Inventor： Kun Ting Tsai ,  Ravi Ichapurapu ,  Durga Laxmi Narayana Swamy Inti ,  Haritha Tamvada ,  Kiran Kumar Edara

IPC: H04B7/06 ,  H04B17/318 ,  H04L1/20 ,  H04W80/02

Abstract: Techniques for transmitting channel state information (CSI) are described. In an example, a device determines a condition associated with a link parameter of a link between the device and another device. Based at least in part on the condition, the device determines a CSI packet period. The device transmits, to the other device and based at least in part on the CSI packet period, a CSI packet over the link. Accordingly, when the conditions change, the CSI packet period can be adapted to the changes, thereby improving the CSI transmissions over the link given the most current conditions.