Method and apparatus for minimizing the number of samples needed to determine cell area coverage reliability in a radiotelephone system
First Claim
1. A method of determining, with a predetermined maximum RF coverage area inaccuracy Δ
- Fu and with a minimum number of signal power value measurements, the radius R of a cell of a wireless communication system, said wireless communication including a base station transmitter, said method comprising the steps of;
a) measuring RF signal power value at a location a distance r from said transmitter;
b) estimating said radius R based upon said measured signal power values;
c) computing an RF coverage area inaccuracy Δ
Fu based upon said measured signal power values; and
,d) repeating steps a) through c) at different locations until Δ
Fu is equal to or less than said predetermined maximum RF coverage area inaccuracy.
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Abstract
A robust method for determining the boundaries of cells and the associated reliability of the RF coverage within these boundaries is presented. The invention accurately determines the average range from the base station to the cell edge from RF signal strength measurements with a linear regression approach. The accuracy of this estimate is quantified both as a range uncertainty (e.g. ±100 meters) and as a cell coverage reliability (i.e. area/edge) through 1) simulation, 2) analysis of real data, and 3) theoretical analysis. It is shown that if the estimate of the cell radius meets the desired accuracy, then the corresponding estimates of coverage reliability (both area and edge) are more than sufficiently accurate. It is recommended that radio survey analyses incorporate this test as part of the coverage validation process.
59 Citations
18 Claims
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1. A method of determining, with a predetermined maximum RF coverage area inaccuracy Δ
- Fu and with a minimum number of signal power value measurements, the radius R of a cell of a wireless communication system, said wireless communication including a base station transmitter, said method comprising the steps of;
a) measuring RF signal power value at a location a distance r from said transmitter;b) estimating said radius R based upon said measured signal power values; c) computing an RF coverage area inaccuracy Δ
Fu based upon said measured signal power values; and
,d) repeating steps a) through c) at different locations until Δ
Fu is equal to or less than said predetermined maximum RF coverage area inaccuracy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18)
- Fu and with a minimum number of signal power value measurements, the radius R of a cell of a wireless communication system, said wireless communication including a base station transmitter, said method comprising the steps of;
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17. A method of determining the minimum number N of signal power value measurements to determine the radius R of a cell of a wireless communication system with a predetermined maximum RF coverage area inaccuracy Δ
- Fu, said wireless communication including a base station transmitter, said method comprising the steps of;
measuring RF signal power value at a plurality of locations, each location a distance r from said transmitter;estimating said radius R based upon said measured signal power values; computing an RF coverage area inaccuracy Δ
Fu based upon said measured signal power values; and
,computing said minimum number N based upon said coverage area inaccuracy Δ
Fu.
- Fu, said wireless communication including a base station transmitter, said method comprising the steps of;
Specification