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公开(公告)号：US20200279476A1
公开(公告)日：2020-09-03
申请号：US16803292
申请日：2020-02-27
Applicant: Kamstrup A/S
Inventor： Jeppe Hofni , Jens Pedersen , Tommy Bechsgaard
Abstract: A radio communication device comprising a radio frequency circuit and a microcontroller arranged to control the radio frequency circuit. The radio communication device further comprises: a radio frequency reference connected to the radio frequency circuit and arranged to be the frequency reference of at least the symbol frequency; a MCU and a time frequency reference connected to the microcontroller. The microcontroller is arranged to determine a frequency error of the time frequency reference relative to the radio frequency reference by performing the steps of: transmitting a radio signal, and signal a timing signal on a control interface, comprising information on start of transmission and end of transmission of the radio signal; receive the timing signal from the radio frequency circuit and measure a transmission duration of the radio signal with reference to the MCU frequency reference and calculate a frequency error of the MCU frequency reference relative to the radio frequency reference based on the measured transmission duration of the radio signal and the number of symbols and the symbol frequency. Further, the microcontroller measures a time period of the time frequency reference with reference to the MCU frequency reference; and calculate the frequency error of the time frequency reference relative to the radio frequency reference.
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公开(公告)号：US11979346B2
公开(公告)日：2024-05-07
申请号：US17557903
申请日：2021-12-21
Applicant: Kamstrup A/S
Inventor： Flemming Hald , Jeppe Hofni , Mathias Rønholt Kielgast , Torben Markussen
IPC: H04L5/00 , H04W72/0446 , H04W72/21
CPC classification number: H04L5/0046 , H04L5/0053 , H04W72/0446 , H04W72/21
Abstract: A wireless communication link management method includes sending data in a primary uplink data frame from the measuring device (7) to the data collection unit (5) via a primary channel. After sending, the measuring device provides a time-limited primary access opportunity (AO) for receiving a link management downlink frame. A primary signal quality is evaluated. A secondary uplink frame is sent from the measuring device via a secondary channel. A time-limited secondary access opportunity for receiving a link management downlink frame is provided. Secondary signal qualities are evaluated. One among the primary access opportunity and the secondary access opportunities is selected for sending a link management downlink frame from the data collection unit to the measuring device depending on the signal qualities. The associated channel is used as the primary channel for sending data in a primary uplink data frame from the measuring device to the data collection unit.
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公开(公告)号：US10922960B2
公开(公告)日：2021-02-16
申请号：US16803292
申请日：2020-02-27
Applicant: Kamstrup A/S
Inventor： Jeppe Hofni , Jens Pedersen , Tommy Bechsgaard
Abstract: A radio communication device comprising a radio frequency circuit and a microcontroller arranged to control the radio frequency circuit. The radio communication device further comprises: a radio frequency reference connected to the radio frequency circuit and arranged to be the frequency reference of at least the symbol frequency; a MCU and a time frequency reference connected to the microcontroller. The microcontroller is arranged to determine a frequency error of the time frequency reference relative to the radio frequency reference by performing the steps of: transmitting a radio signal, and signal a timing signal on a control interface, comprising information on start of transmission and end of transmission of the radio signal; receive the timing signal from the radio frequency circuit and measure a transmission duration of the radio signal with reference to the MCU frequency reference and calculate a frequency error of the MCU frequency reference relative to the radio frequency reference based on the measured transmission duration of the radio signal and the number of symbols and the symbol frequency. Further, the microcontroller measures a time period of the time frequency reference with reference to the MCU frequency reference; and calculate the frequency error of the time frequency reference relative to the radio frequency reference.
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