公开(公告)号：US20240275428A1

公开(公告)日：2024-08-15

申请号：US18647678

申请日：2024-04-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： KUMARAN VIJAYASANKAR ,  ROBERT LIANG ,  JYOTHSNA KUNDURU ,  KWANG SEOP EOM

IPC: H04B1/7156 ,  H04W4/80 ,  H04W52/02

CPC classification number: H04B1/7156 ,  H04W4/80 ,  H04W52/0235 ,  H04W52/0274 ,  H04B2001/71563 ,  H04B2201/71338 ,  Y02D30/70

Abstract: A radio communications device includes a RTC configured to run even during sleep for receiving from a coordinator node (CN) in an asynchronous channel hopping WPAN an asynchronous hopping sequence (AHS) frame that includes the CN's hopping sequence. A processor implements a stored sleepy device operation in asynchronous channel hopping networks algorithm. The algorithm is for determining a time stamp for the AHS frame and the CN's initial timing position within the hopping sequence, storing the time stamp, going to sleep and upon waking up changing a frequency band of its receive (Rx) channel to an updated fixed channel. A data request command frame is transmitted by the device on the CN's listening channel that is calculated from the CN's hopping sequence, time stamp, CN's initial timing position and current time, and the device receives an ACK frame transmitted by the CN at the updated fixed channel of Rx operation.

公开(公告)号：US20180027588A1

公开(公告)日：2018-01-25

申请号：US15450644

申请日：2017-03-06

Applicant: Texas Instruments Incorporated

Inventor： KUMARAN VIJAYASANKAR ,  JYOTHSNA KUNDURU

IPC: H04W74/08 ,  H04L5/00 ,  H04B1/713 ,  H04W4/00

CPC classification number: H04W74/0808 ,  H04B1/713 ,  H04B2001/7154 ,  H04L5/0012 ,  H04L5/0055 ,  H04W4/80 ,  H04W74/085

Abstract: A method of channel access for a radio device in an asynchronous channel hopping wireless network. A backoff time is set from an Interference Avoidance Delay plus a random backoff time for transmissions from the radio device. For initial frame transmissions, an initial value for a number of backoffs (nb) and initial number of preamble detection backoffs (npdb) is set. After waiting for expiring of the initial backoff time and provided a current npdb_value

公开(公告)号：US20230223986A1

公开(公告)日：2023-07-13

申请号：US18185609

申请日：2023-03-17

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： KUMARAN VIJAYASANKAR ,  ROBERT LIANG ,  JYOTHSNA KUNDURU ,  KWANG SEOP EOM

IPC: H04W52/02 ,  H04B1/7156

CPC classification number: H04W52/0274 ,  H04B1/7156 ,  H04B2201/71338

Abstract: A radio communications device includes a RTC configured to run even during sleep for receiving from a coordinator node (CN) in an asynchronous channel hopping WPAN an asynchronous hopping sequence (AHS) frame that includes the CN's hopping sequence. A processor implements a stored sleepy device operation in asynchronous channel hopping networks algorithm. The algorithm is for determining a time stamp for the AHS frame and the CN's initial timing position within the hopping sequence, storing the time stamp, going to sleep and upon waking up changing a frequency band of its receive (Rx) channel to an updated fixed channel. A data request command frame is transmitted by the device on the CN's listening channel that is calculated from the CN's hopping sequence, time stamp, CN's initial timing position and current time, and the device receives an ACK frame transmitted by the CN at the updated fixed channel of Rx operation.

公开(公告)号：US20170310358A1

公开(公告)日：2017-10-26

申请号：US15332707

申请日：2016-10-24

Applicant: Texas Instruments Incorporated

Inventor： KUMARAN VIJAYASANKAR ,  ROBERT LIANG ,  JYOTHSNA KUNDURU ,  KWANG SEOP EOM

IPC: H04B1/7156 ,  H04W4/00 ,  H04W52/02

CPC classification number: H04B1/7156 ,  H04B2001/71563 ,  H04W4/80 ,  H04W52/0235 ,  H04W52/0274 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/40

Abstract: A radio communications device includes a RTC configured to run even during sleep for receiving from a coordinator node (CN) in an asynchronous channel hopping WPAN an asynchronous hopping sequence (AHS) frame that includes the CN's hopping sequence. A processor implements a stored sleepy device operation in asynchronous channel hopping networks algorithm. The algorithm is for determining a time stamp for the AHS frame and the CN's initial timing position within the hopping sequence, storing the time stamp, going to sleep and upon waking up changing a frequency band of its receive (Rx) channel to an updated fixed channel. A data request command frame is transmitted by the device on the CN's listening channel that is calculated from the CN's hopping sequence, time stamp, CN's initial timing position and current time, and the device receives an ACK frame transmitted by the CN at the updated fixed channel of Rx operation.

公开(公告)号：US20210320687A1

公开(公告)日：2021-10-14

申请号：US17356792

申请日：2021-06-24

Applicant: Texas Instruments Incorporated

Inventor： KUMARAN VIJAYASANKAR ,  ROBERT LIANG ,  JYOTHSNA KUNDURU ,  KWANG SEOP EOM

IPC: H04B1/7156 ,  H04W4/80 ,  H04W52/02

Abstract: A radio communications device includes a RTC configured to run even during sleep for receiving from a coordinator node (CN) in an asynchronous channel hopping WPAN an asynchronous hopping sequence (AHS) frame that includes the CN's hopping sequence. A processor implements a stored sleepy device operation in asynchronous channel hopping networks algorithm. The algorithm is for determining a time stamp for the AHS frame and the CN's initial timing position within the hopping sequence, storing the time stamp, going to sleep and upon waking up changing a frequency band of its receive (Rx) channel to an updated fixed channel. A data request command frame is transmitted by the device on the CN's listening channel that is calculated from the CN's hopping sequence, time stamp, CN's initial timing position and current time, and the device receives an ACK frame transmitted by the CN at the updated fixed channel of Rx operation.

公开(公告)号：US20180376437A1

公开(公告)日：2018-12-27

申请号：US15694196

申请日：2017-09-01

Applicant: Texas Instruments Incorporated

Inventor： KUMARAN VIJAYASANKAR ,  ARVIND KANDHALU RAGHU ,  JYOTHSNA KUNDURU

IPC: H04W56/00 ,  H04W72/04 ,  H04L12/26 ,  H04L5/00

Abstract: A method of channel access for a radio device in an asynchronous channel hopping wireless network includes a channel hopping coordinator first radio device transmitting its receive (Rx) channel hopping sequence to a fixed or semi-channel hopping sleepy radio device. The sleepy radio device tracks the first radio device's Rx channel using the channel hopping sequence and transmits a poll frame exclusive of a unicast schedule information element (US-IE) on the first radio device's current Rx channel to the first radio device. The sleepy radio device moves to an updated Rx channel that is a function of the current Rx channel. The first radio device receives the poll frame and then computes the updated Rx channel as the function of the current Rx channel. After the computing, the first radio device transmits a data frame to the sleepy radio device on the updated Rx channel.