Abstract
The invention relates to a method of measuring a time difference and a radio system employing the method the radio system comprising base stations terminals time difference units and a time difference centre. A real time difference of the base station is formed on the basis of measurements carried out by the time difference units by means of an observed time difference and a geometrical time difference in the time difference centre as a function of time in which case the moment of occurrence of the real time difference measured is connected to the real time difference RTD of the base station.
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| 2G | 18/12/2002 | ISLD-200301-003 | NOKIA CORP | No | Family Member | ||||
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| 2G | 07/01/2003 | ISLD-200301-005 | NOKIA CORP | Yes | Basis Patent | ||||
Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | |||||||
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Technologies
Measurement
Product
Use Cases
Wireless communication
Services
Claim
1. A method of measuring a time difference, the method being used in a radio system including at least two base stations and a subscriber terminal, the method comprising:', 'transmitting signals from at least two base stations;', 'receiving the signals transmitted by the base stations;', 'measuring a first observed time difference of the received signals;', 'calculating a first geometrical time difference of the received signals; and', 'forming a real time difference of the received signals from the first observed time difference and the first geometrical time difference as a function of time by connecting a moment of occurrence to the real time difference.
2. The method as claimed in claim 1, further comprising:', 'using a subscriber terminal to receive the signals transmitted by the at least two base stations;', 'using the subscriber terminal to measure a second observed time difference of the received signals; and', 'forming a second geometric time difference by subtracting the real time difference from the second observed time difference corresponding thereto in time to determine a location of the subscriber terminal.
3. The method as claimed in claim 1, wherein the radio system includes at least a time difference unit and a time difference centre, the time difference unit measuring the first observed time difference and transmitting the first observed time difference to the time difference centre, the time difference centre forming the real time difference from the first observed time difference and the first geometrical time difference as a function of time, wherein the time difference centre interpolates and extrapolates from the real time difference the behaviour of real time differences at times other than the moment of occurrence.
4. The method as claimed in claim 3, wherein the time difference unit comprises a clock to measure the real time difference and the moment of occurrence of the real time difference.
5. The method as claimed in claim 3, wherein the time difference centre filters and averages the measured real time differences in a predetermined time window.
6. The method as claimed in claim 3, wherein the time difference centre controls a reporting frequency of the first observed time differences in accordance with a rate at which an average value of the real time difference changes.
7. The method as claimed in claim 2, wherein in a GSM radio system the time difference centre transmits the real time difference, the moment of occurrence of the real time difference and/or the location of the subscriber terminal in a short message.
8. The method as claimed in claim 1, wherein in a radio system where transmission is carried out in frames, the moment of occurrence of the real time difference is referenced to timing frame numbers.
9. The method as claimed in claim 8, wherein in the radio system, timing information is transmitted on a control channel, the timing information being used by the time difference unit to measure the real time difference and determine the moment of occurrence of the real time difference
10. The method as claimed in claim 1, wherein the real time difference is measured at predetermined intervals
11. The method as claimed in claim 2, wherein determination of the location of the subscriber terminal uses the real time difference having the closest moment of occurrence relative to the second observed time difference
12. A radio system comprising:', 'at least two base stations and a subscriber terminal, wherein the at least two base stations transmit a signal;', 'a time difference unit to receive the base station signals and to measure a first observed time difference between the base station signals; and', 'a time difference centre whereto the time difference unit transmits the first observed time difference, the time difference centre having information available on a first geometrical time difference between the at least two base stations, wherein the time difference centre forms a real time difference as a function of time by utilizing the first observed time difference and the first geometrical time difference calculated in a manner such that the time difference centre connects a moment of occurrence of the real time difference to the real time difference
13. The radio system as claimed in claim 12, wherein the radio system further comprises a location system of the subscriber terminal and the location system is arranged to utilize the real time difference in a manner such that the subscriber terminal is arranged to measure a second observed time difference between the base station signals, and the location system is arranged to subtract the real time difference from the second observed time difference so as to form a second geometrical time difference of the subscriber terminal to determine the location of the subscriber terminal
14. The radio system as claimed in claim 12, wherein the time difference unit comprises a clock to measure the real time difference
15. The radio system as claimed in claim 12, wherein the time difference centre is arranged to interpolate and extrapolate by means of the real time difference the behaviour of real time differences at times other than the moment of occurrence
16. The radio system as claimed in claim 12, wherein the time difference unit uses frame numbers to time stamp the measurement of the real time difference
17. The radio system as claimed in claim 12, wherein the radio system is arranged to transmit time information on a control channel and the time difference unit is arranged to time stamp the measurement of the real time difference using the time information
18. The radio system as claimed in claim 12, wherein the time difference centre is arranged to measure the real time difference at predetermined intervals
19. The radio system as claimed in claim 12, wherein the time difference centre is arranged to filter and average measured real time differences in a predetermined time window.
20. The radio system as claimed in claim 12, wherein the time difference centre controls a reporting frequency of the first observed time differences in accordance with a rate at which an average value of the real time difference changes.
21. The radio system as claimed in claim 13, wherein the radio system is a GSM radio system in which short messages are transmitted and the time difference centre is arranged to transmit a short message which comprises the real time difference, the moment of occurrence associated with the real time difference and/or the location of the subscriber terminal.
22. The radio system as claimed in claim 13, wherein the location system of the subscriber terminal is arranged to use the real time difference that is closest in time relative to the second observed time difference.']
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SUMMARY
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.