Method and system for determining position of a mobile terminal utilizing time of arrival calculation in combination with a time difference of arrival calculation
First Claim
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1. A method of determining a position of a mobile radio terminal arranged for communication with a plurality of base stations, comprising:
- employing exactly one Time Of Arrival calculation in combination with a Time Difference Of Arrival calculation, the combined Time Of Arrival and Time Difference Of Arrival calculations performed on signals transmitted in a downlink communication channel from the base stations to the mobile radio terminal, andreceiving sector information, including which sector of a cell the mobile radio terminal is located, whereby the position of the mobile radio terminal is determinable by signals from two of the base stations including the sector information, wherein the Time Of Arrival calculation is performed exclusively on signals received from the base station with which the mobile radio terminal is in registration.
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Abstract
The present invention provides for a method of, and related system for, determining the position of a mobile radio terminal (10,M) arranged for communication with a plurality of base stations (BS1, BS2) and including the steps of employing a Time Of Arrival calculation in combination with a Time Difference Of Arrival calculation, characterized by performing the combined Time of Arrival and Time Difference Of Arrival calculations on signals transmitted in the downlink channel from the base stations (BS1, BS2) to the mobile radio terminal (10,M).
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Citations
17 Claims
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1. A method of determining a position of a mobile radio terminal arranged for communication with a plurality of base stations, comprising:
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employing exactly one Time Of Arrival calculation in combination with a Time Difference Of Arrival calculation, the combined Time Of Arrival and Time Difference Of Arrival calculations performed on signals transmitted in a downlink communication channel from the base stations to the mobile radio terminal, and receiving sector information, including which sector of a cell the mobile radio terminal is located, whereby the position of the mobile radio terminal is determinable by signals from two of the base stations including the sector information, wherein the Time Of Arrival calculation is performed exclusively on signals received from the base station with which the mobile radio terminal is in registration. - View Dependent Claims (2, 3)
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4. A mobile radio system, comprising:
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a plurality of base stations; and a mobile radio terminal arranged for communication with one or more of the base stations, wherein the mobile radio terminal includes a calculation device which performs Time Of Arrival and Time Difference Of Arrival calculations on signals transmitted in a downlink channel from the base stations, wherein the calculation device combines exactly one Time Of Arrival calculation with a Time Difference Of Arrival calculation and sector information including which sector of a cell the mobile radio terminal is located to determine a position of the radio terminal, whereby the position of the mobile radio terminal is determinable from signals from two of the base stations, wherein the Time Of Arrival calculation is performed exclusively on signals received from the base station with which the mobile radio terminal is in registration. - View Dependent Claims (5, 6, 7)
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8. A mobile radio terminal, comprising:
a calculation device which performs combined Time Of Arrival and Time Difference Of Arrival calculations on signals transmitted from at least two base stations, wherein the calculation device combines exactly one Time Of Arrival calculation with a Time Difference Of Arrival calculation and sector information including which sector of a cell the mobile radio terminal is located to determine a position of the radio terminal, and whereby the position of the mobile radio terminal is determinable from signals from two of the base stations, wherein the calculation device is arranged to perform the Time Of Arrival calculation exclusively on signals received from the base station with which it is registered. - View Dependent Claims (9, 10, 11)
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12. A mobile radio system, comprising:
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a plurality of base stations; and a mobile radio terminal arranged for communication with one or more of the base stations, wherein the mobile radio terminal includes; means for performing a Time Of Arrival calculation on signals transmitted in a downlink channel from the base stations, and means for performing a Time Difference Of Arrival calculation on signals transmitted in the downlink from the base stations, wherein a result of a position determination calculation combining exactly one Time of Arrival calculation with a Time Difference Of Arrival calculation and sector information including which sector of a cell the mobile radio terminal is located is available directly at the mobile radio terminal; and whereby the position of the mobile radio terminal is determinable from signals from two of the base stations, wherein the Time Of Arrival calculation is performed exclusively on signals received from the base station with which the mobile radio terminal is in registration. - View Dependent Claims (13)
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14. A mobile radio terminal, comprising:
a calculation device which performs a combination of exactly one Time Of Arrival calculation and a Time Difference Of Arrival calculation on signals transmitted from less than three base stations, wherein a location of the mobile radio terminal is determined using the signals from the less than three base stations and sector information including which sector of a cell the mobile radio terminal is located, and wherein the calculation device is arranged to perform the Time Of Arrival calculation exclusively on signals received from the base station with which it is registered. - View Dependent Claims (15, 16, 17)
Specification