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 (100 to 104) terminals (114 to 116) time difference units (106 to 110) and a time difference centre (112). A real time difference RTD of the base station (100 to 104) is formed on the basis of measurements carried out by the time difference units (106 to 110) by means of an observed time difference OTD and a geometrical time difference GTD in the time difference centre (112) as a function of time in which case the moment of occurrence of the real time difference RTD measured is connected to the real time difference RTD of the base station (100 to 104).
The invention relates to a method of measuring a time difference and a radio system employing the method the radio system comprising base stations (100 to 104) terminals (114 to 116) time difference units (106 to 110) and a time difference centre (112). A real time difference RTD of the base station (100 to 104) is formed on the basis of measurements carried out by the time difference units (106 to 110) by means of an observed time difference OTD and a geometrical time difference GTD in the time difference centre (112) as a function of time in which case the moment of occurrence of the real time difference RTD measured is connected to the real time difference RTD of the base station (100 to 104).
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
|---|---|---|---|---|---|---|---|---|---|
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Specification Information
Specification Information
Technologies
Family Information
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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 comprising at least two base stations (100 to 104) and a terminal (114, 116), in which radio system an observed time difference OTD of the base stations (100 to 104) is measured and a geometrical time difference GTD is calculated, characterized in that the real time difference RTD of the base stations (100 to 104) is formed by means of the observed time difference OTD and the geometrical time difference GTD as a function of time by connecting the moment of occurrence of the measured real time difference RTD to the real time difference RTD of the base stations (100 to 104).
2. A method as claimed in claim 1, characterized in that the real time difference RTD is utilized in the location of the terminal (114, 116) in a manner such that the subscriber terminal (114, 116) measures the observed time difference OTD of the base stations (100 to 104), and the real time differ- ence RTD corresponding thereto in time is subtracted from the OTD.
3. A method as claimed in claim ^characterized in that the radio system comprises at least a time difference unit (106 to 110) and a time difference centre (112) from which the time difference unit (106 to 110) measures the observed time difference OTD and transmits information on the ob- served time difference OTD to the time difference centre (112) which forms the real time difference RTD of the base station (100 to 104) by means of the observed time difference and the geometrical time difference GTD as a function of time, and the time difference centre (112) interpolates and extrapolates by means of the real time differences RTD the behaviour of the measured real time difference RTD of the base station (100 to 110) at times other than the moment of occurrence.
4. A method as claimed in claim 3, characterized in that the time difference unit (106 to 110) comprises a clock (120) by means of which the time difference unit (106 to 110) measures the real time difference RTD of the base station (100 to 104) and by which the moment of occurrence of the real time difference RTD is determined.
5. A method as claimed in claim 3, characterized in that the time difference centre (112) filters and averages the measured real time differences RTD in a predetermined time window. 8
6. A method as claimed in claim 1, characterized in that the real time difference RTD of the base station (100 to 104) is measured in accordance with the rate at which the average value of the real time difference RTD changes.
7. A method as claimed in claim 2, characterized in that in the GSM radio system the time difference centre (112) transmits information on the real time difference RTD measured, information on the moment of occurrence of the real time difference RTD and/or information on the location of the terminal (114, 116) in a short message.
8. A method as claimed in claim ^ characterized in that in the radio system, transmission is carried out in frames and in timing frame numbers are used by means of which the moment of occurrence of the real time differences RTD of the base stations (100 to 104) is determined.
9. A method as claimed in claim ^ characterized in that in the radio system, information is transmitted on a control channel, by means of which the time difference unit (106 to 110) measures the real time difference RTD and by which the moment of occurrence of the real time difference RTD is determined
10. A method as claimed in claim 1, characterized in that the real time difference RTD is measured regularly
11. A method as claimed in claim 2, characterized in that in when the terminal (114 to 116) is located, the real time difference RTD of the base stations (100 to 104), which has the closest moment of occurrence, is used
12. A radio system comprising at least two base stations (100 to104) and a terminal (114, 116), a time difference unit (106 to 110) arranged to measure an observed time difference OTD of the base station (100 to 104), and a time difference centre (112) whereto the time difference unit (106 to 104) is arranged to transmit its measuring information, and which radio system has information available on geometrical time differences GTD of the base stations (100 to 104), characterized in that the time difference centre (112) is arranged to form a real time difference RTD of the base stations (100 to 104) as a function of time by utilizing the observed time difference OTD and the geometrical time difference GTD calculated in a manner such that the time difference centre (112) is arranged to connect the moment of occurrence of the real time difference RTD to the real time difference RTD. 913. A radio system as claimed in claim 12, characterized in that the radio system comprises a location system of the terminal (114, 116) and the location system is arranged to utilize the real time difference RTD of the base stations (100 to 104) in a manner such that the terminal (114, 116) is arranged to measure the observed time difference OTD of the base stations (100 to 104), and the location system is arranged to subtract the real time difference RTD from the observed time difference OTD so as to form the geometrical time difference GTD of the terminal (114, 116) and determine the location of the terminal (114, 116)
14. A radio system as claimed in claim 12, c h a ra cte rize d in that the time difference unit (106 to 110) comprises a clock (120) by means of which the time difference unit (106 to 110) is arranged to measure the real time difference RTD
15. A radio system as claimed in claim 12, characterized in that the time difference centre (112) is arranged to interpolate and extrapolate by means of the measured real time differences RTD the behaviour of the real time difference RTD of the base stations (100 to 104) at times other than the moment of occurrence
16. A radio system as claimed in claim 12, characterized in that the radio system is arranged to use frame numbers by means of which the time difference unit (106 to 110) is arranged to time stamp the measurement of the real time difference RTD
17. A radio system as claimed in claim 12, characterized in that the radio system is arranged to transmit time information on a control channel and the time difference unit (106 to 110) is arranged to time stamp the measurement of the real time difference RTD by means of the time information
18. A radio system as claimed in claim 12, characterized in that the time difference centre (112) is arranged to measure the real time dif- ference RTD regularly
19. A radio system as claimed in claim 12, characterized in that the time difference centre (112) is arranged to filter and average the measured real time differences RTD in a predetermined time window.
20. A radio system as claimed in claim 12, characterized in that the time difference centre (112) is arranged to measure the real time dif- 10 ference RTD of the base station (100 to 104) in accordance with the rate at which the average value of the real time difference RTD changes.
21. A radio system as claimed in claim 13, characterized in that the radio system is a GSM radio system in which short messages are transmitted and the time difference centre (112) is arranged to transmit a short message which comprises the real time difference RTD measured, the measurement time associated with the time difference and/or the location of the terminal (114, 116).
22. A radio system as claimed in claim 13, characterized in that the location system of the terminal (114, 116) is arranged to use the real time difference of the base station (100 to 104) that is closest in time.']
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SUMMARY
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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.