Methods for determing times and changes of times of transmission, radio communications system and processor
First Claim
1. Method for determining times of transmission of signals transmitted by at least one radio transmitter (BTS), the method comprising:
- transmitting signals by said at least one radio transmitter (BTS);
receiving transmitted signals by at least two radio receivers (LMU A,B);
determining for each of said radio receivers (LMU A,B) the respective times of reception of the received signals;
estimating for each of said radio receivers (LMU A,B) times of transmission of said received signals based on the determined times of reception of said received signals and on the geographical location of the at least one radio transmitter (BTS) and the respective radio receiver (LMU A,B);
filtering the estimated times of transmission based on a determined difference in the time levels of the times of transmission estimated separately for the at least two radio receivers (LMU A,B) for obtaining accurate values for the transmission times of signals transmitted by said radio transmitter (BTS).
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Accused Products
Abstract
The invention relates to a method for determining transmission times of signals transmitted by at least one radio transmitter BTS. In order to enhance the accuracy and reliability of estimates of transmission times or of changes of the transmission time of signals transmitted by radio transmitters BTS, it is proposed that a difference in the time level of estimates of the transmission times based on the measurement results of two different radio receivers LMU A,B is taken into account in a filtering of the estimates for obtaining an accurate value for the transmission times. It is further proposed that the changes of the transmission times estimated at different receivers LMU A,B is averaged for obtaining an accurate information about the changes. The invention equally relates to a corresponding radio communications system and to a processing unit for such a system.
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Citations
22 Claims
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1. Method for determining times of transmission of signals transmitted by at least one radio transmitter (BTS), the method comprising:
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transmitting signals by said at least one radio transmitter (BTS);
receiving transmitted signals by at least two radio receivers (LMU A,B);
determining for each of said radio receivers (LMU A,B) the respective times of reception of the received signals;
estimating for each of said radio receivers (LMU A,B) times of transmission of said received signals based on the determined times of reception of said received signals and on the geographical location of the at least one radio transmitter (BTS) and the respective radio receiver (LMU A,B);
filtering the estimated times of transmission based on a determined difference in the time levels of the times of transmission estimated separately for the at least two radio receivers (LMU A,B) for obtaining accurate values for the transmission times of signals transmitted by said radio transmitter (BTS). - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11)
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6. Method for determining changes in the times of transmission of signals transmitted by at least one radio transmitter (BTS), the method comprising:
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transmitting signals by said at least one radio transmitter (BTS);
receiving transmitted signals by at least two radio receivers (LMU A,B);
determining for each of said radio receivers (LMU A,B) values indicative of the respective changes in the times of reception of the received signals;
averaging the values indicative of the respective changes of times of reception determined for said at least two radio receivers (LMU A,B) for obtaining a reliable information about the changes of the times of transmission of the signals transmitted by said at least one radio transmitter (BTS).
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12. Radio communications system comprising
at least one radio transmitter (BTS) for transmitting radio signals, at least two radio receivers (LMU A,B) for receiving signals transmitted by said at least one radio transmitter (BTS) and for determining the respective times of reception of received signals; processing means for estimating for each of said radio receivers (LMU A,B) times of transmission of said received signals based on the determined times of reception of said received signals and on the geographical location of the at least one radio transmitter (BTS) and the respective radio receiver (LMU A,B), and for filtering the times of transmission estimated based on a determined difference in the time level of the times of transmission estimated separately for the at least two radio receivers (LMU A,B) for obtaining accurate values for the transmission times of signals transmitted by said radio transmitter (BTS). - View Dependent Claims (13, 14, 15, 16, 18, 19, 20, 21, 22)
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17. Radio communications system comprising
at least one radio transmitter (BTS) for transmitting radio signals, at least two radio receivers (LMU A,B) for receiving signals transmitted by the at least one radio transmitter (BTS); - and
processing means for determining for each of said radio receivers (LMU A,B) values indicative of the respective changes in the times of reception of the received signals, and for averaging the values indicative of the respective changes of the determined times of reception determined for said at least two radio receivers (LMU A,B) in order to obtain a reliable information about the changes of the times of transmission of the signals transmitted by said at least one radio transmitter (BTS).
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Specification