Method for operating a radio transmission system, and arrangement of a radio transmission system

Patent metadata

Field	Value
Publication number	US-10826675-B2
Application number	US-201916427497-A
Country	US
Kind code	B2
Filing date	May 31, 2019
Priority date	Jun 8, 2018
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A method operates a radio transmission system with a radio transmitter and a radio receiver. The radio transmitter has a transmitter timer and transmits a packet and/or a subpacket and/or a plurality of packets in succession for the transmission of data. A carrier frequency and the transmission times of the data and/or the carrier frequency and the sampling rate of the data and/or the transmission times of the data and the sampling rate of the data depend on the transmitter timer. The radio receiver has a receiver timer with time-measuring measures to define transmission times, carrier frequencies and/or sampling rates. The radio receiver estimates an error on the basis of the received data and determines a time error therefrom. A temporal correction factor for the compensation is defined on the basis of the time error.

First claim

The invention claimed is:

1. A method for operating a radio transmission system with a radio transmitter and at least one radio receiver, the radio transmitter having at least one transmitter timer, and the radio receiver having at least one receiver timer with time-measuring means to define transmission times and/or to define carrier frequencies and/or to define sampling rates, the receiver timer having an oscillating crystal and a high-frequency crystal, which comprises the steps of:
transmitting, via the radio transmitter, a packet, a subpacket and/or a plurality of packets in succession for a transmission of data, a carrier frequency and transmission times of the data and/or the carrier frequency and a sampling rate of the data and/or the transmission times of the data and the sampling rate depend on the transmitter timer;
estimating, via the radio receiver, an error on a basis of the data and determining a time error from the error;
defining a temporal correction factor for compensation on a basis of the time error; and
performing a first calibration step by tuning the oscillating crystal of the receiver timer to the high-frequency crystal of the receiver timer while the high-frequency crystal is activated.

2. The method according to claim 1 , wherein the radio receiver is energy self-sufficient.

3. The method according to claim 1 , which further comprises transmitting, via the radio transmitter, the packet in fragmented form as subpackets by inserting at least two pauses within the packet, wherein the pauses are generated from the transmitter timer from which the carrier frequency is generated.

4. The method according to claim 1 , which further comprises deactivating the radio receiver and/or the radio transmitter between two consecutive said packets, namely a switch to a sleep mode, in order to save energy, and a wake-up for a next packet is defined, inter alia, by the temporal correction factor.

5. The method according to claim 1 , which further comprises:
calculating, via the radio receiver, a difference between the transmitter timer and the receiver timer on a basis of a carrier frequency of the radio transmitter; and
calculating at least one correction factor from the difference.

6. The method according to claim 5 , which further comprises calculating a different wake-up time for each subpacket on a basis of a difference between the transmitter timer and the receiver timer.

7. The method according to claim 4 , which further comprises calculating a different wake-up time for each subpacket on a basis of a difference between the transmitter timer and the receiver timer.

8. The method according to claim 1 , wherein the transmitter timer includes an oscillating crystal and a high-frequency crystal.

9. The method according to claim 8 , which further comprises deriving the oscillating crystal from the high-frequency crystal.

10. The method according to claim 1 , which further comprises:
transmitting a synchronization sequence by the radio transmitter on a carrier frequency;
searching, via the radio receiver, in a defined search window for possible carrier signals of the radio transmitter;
finding, via the radio receiver, a carrier signal of the radio transmitter; and
determining, via the radio receiver, a frequency error and/or a time error of the radio transmitter from the synchronization sequence received.

11. The method according to claim 1 , which further comprises using the high-frequency crystal for a fine-tuning of the receiver timer and the transmitter timer.

12. The method according to claim 1 , wherein the first calibration step additionally comprises activating the high-frequency crystal of the receiver timer.

13. The method according to claim 1 , which further comprises performing a second calibration step which comprises the following method steps of:
defining a sampling rate error of the radio transmitter by defining a deviation of a carrier frequency of the radio transmitter; and
calculating the temporal correction factor on a basis of the sampling rate error for a compensation of different sampling rates between the radio transmitter and the radio receiver.

14. The method according to claim 1 , wherein the radio transmission system is a narrowband system.

15. The method according to claim 1 , wherein the radio transmission system is a system with a frequency hopping method.

16. The method according to claim 1 , wherein the radio transmitter is a base station and the radio receiver is a consumption meter.

17. A radio transmission system, comprising:
a radio transmitter having at least one transmitter timer;
at least one radio receiver having at least one receiver timer with time-measuring means to define transmission times and/or to define carrier frequencies and/or to define sampling rates, said receiver timer having an oscillating crystal and a high-frequency crystal;
the radio transmission system programmed to:
transmit, via said radio transmitter, a packet, a subpacket and/or a plurality of packets in succession for a transmission of data, a carrier frequency and transmission times of the data and/or the carrier frequency and a sampling rate of the data and/or the transmission times of the data and the sampling rate depending on the transmitter timer;
estimate, via the radio receiver, an error on a basis of the data and determine a time error from the error;
define a temporal correction factor for compensation on a basis of the time error; and
at least one of:
perform a first calibration step by tuning said oscillating crystal of said receiver timer to said high-frequency crystal of said receiver timer while said high-frequency crystal is activated; or
form the temporal correction factor from at least first and second correction factors, the first correction factor is obtained from a difference between said transmitter timer and said receiver timer, and the second correction factor is obtained from a difference between said oscillating crystal of said receiver timer and said high-frequency crystal of said receiver timer.

18. A method for operating a radio transmission system with a radio transmitter and at least one radio receiver, the radio transmitter having at least one transmitter timer, and the radio receiver having at least one receiver timer with time-measuring means to define transmission times and/or to define carrier frequencies and/or to define sampling rates, which comprises the steps of:
transmitting, via the radio transmitter, a packet, a subpacket and/or a plurality of packets in succession for a transmission of data, a carrier frequency and transmission times of the data and/or the carrier frequency and a sampling rate of the data and/or the transmission times of the data and the sampling rate depend on the transmitter timer;
estimating, via the radio receiver, an error on a basis of the data and determining a time error from the error; and
defining a temporal correction factor for compensation on a basis of the time error;
providing the radio transmitter as a base station;
transmitting, via the radio transmitter, the packet in fragmented form as subpackets by inserting at least two pauses within the packet, wherein the pauses are generated from the transmitter timer from which the carrier frequency is generated; and
deactivating the radio receiver and/or the radio transmitter in the pauses of the packet, namely by switching to a sleep mode, in order to save energy, and a wake-up is defined, inter alia, by the temporal correction factor.

19. A method for operating a r

Assignees

• Diehl Metering Systems Gmbh

Inventors

• Mzyk Raphael
• Petkov Hristo
• Kauppert Thomas
• Gottschalk Klaus

Classifications

• H04Q9/00

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title

• H04L7/0016 Primary

  correction of synchronization errors · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04L7/00

  Arrangements for synchronising receiver with transmitter {(synchronisation of generators of electric oscillations or pulses H03L7/00)} · CPC title

• H04B7/18506

  Communications with or from aircraft, i.e. aeronautical mobile service · CPC title