Method for indicating the functional capability of the vehicle-to-environment communication in ISM radio bands
First Claim
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1. A method for detecting communications problems in vehicle-to-environment communication in an ISM radio band, the method comprising:
- determining channel usage of the ISM radio band by comparing a channel time occupied by communication messages with a maximum channel time available for communication messages;
if the occupied channel time exceeds a first channel usage threshold value, outputting a first channel usage warning message indicating that the occupied channel time exceeds the first channel usage threshold value and reducing a data transmission repetition rate to a first repetition rate; and
if the occupied channel time exceeds a second channel usage threshold value, higher than the first channel usage threshold value, outputting a second channel usage warning message indicating that the occupied channel time exceeds the second channel usage threshold value and reducing the data transmission repetition rate to a second repetition rate, lower than the first repetition rate,wherein the repetition rate is reduced only for non-safety-critical functions.
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Abstract
A method and a communications unit carrying out the method detects communications problems in the vehicle-to-environment communications in an ISM radio band. To determine the functional ability or the performance capacity of vehicle-to-environment communications, the channel usage of the ISM radio band in use is determined by comparing the channel time occupied by communication messages to the maximum channel time available for communication messages. A warning message is output if the occupied channel time exceeds a threshold value.
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Citations
5 Claims
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1. A method for detecting communications problems in vehicle-to-environment communication in an ISM radio band, the method comprising:
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determining channel usage of the ISM radio band by comparing a channel time occupied by communication messages with a maximum channel time available for communication messages; if the occupied channel time exceeds a first channel usage threshold value, outputting a first channel usage warning message indicating that the occupied channel time exceeds the first channel usage threshold value and reducing a data transmission repetition rate to a first repetition rate; and if the occupied channel time exceeds a second channel usage threshold value, higher than the first channel usage threshold value, outputting a second channel usage warning message indicating that the occupied channel time exceeds the second channel usage threshold value and reducing the data transmission repetition rate to a second repetition rate, lower than the first repetition rate, wherein the repetition rate is reduced only for non-safety-critical functions. - View Dependent Claims (2, 3, 4, 5)
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Specification