EP0986276A2
Expired / Lapsed
EP
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Method and apparatus for estimating pilot coverages
Assignee: Nokia of America Corp
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Filing: 1999-08-31
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Granted: —
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Expires: 2019-08-31
Abstract
Abstract A method and system that minimizes pilot signal overlap and radio frequency ("RF") interference by estimating changes in pilot coverage for different traffic channel loading and power conditions. Once base stations are positioned, a terminal for measuring received pilot signal strengths, such as a mobile station or pilot scanner, is used to collect and generate the baseline pilot survey data, which is then stored on a disk or tape. Base station transmit pilot E C /I O s, i.e., traffic channel loads on forward links, are also stored on disk or tape. The invention uses two adjustment factors associated with transmit power and traffic channel loading to optimize for different RF conditions, specifically for different base station transmit power or forward link loading conditions. For each RF condition, the methodology calculates the changes in the baseline pilot survey data. This reflects what E C /I O s a mobile station would receive under the given conditions. The systems engineer collects a set of optimized base station power settings for each of the different traffic channel load conditions. One of these optimized power settings is then selected by the systems engineer for each of the base stations.
Inventors
- 👤 Neil E. Bernstein
- 👤 Xiao Cheng Wu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 08:42
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/18; H04W52/00; H04W52/04; H04W52/30; H04W52/34; H04W52/32
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
119 words
In a wireless communications system having base stations and means for
generating baseline pilot survey data and base station initial traffic loading information, a
method for establishing base station transmit power levels for different operating
conditions, said method comprising the steps of: inputting values for a first adjustment factor which represents variations in base
transmit power and a second adjustment factor which represents variations in traffic
channel loading; calculating pilot coverages based on said baseline pilot survey data, said base
station initial traffic loading information, said cell transmit power adjustment factor and
said cell traffic channel loading adjustment factor; and setting transmit power levels for at least one of the base stations based on a
selected pilot coverage criteria.
Claim 2
Dependent Claim
29 words
The method according to claim 1, wherein said base station initial traffic loading
data represents the ratio of pilot signal power to total power transmitted by a base
station.
Claim 3
Dependent Claim
28 words
The method according to claim 1, wherein said baseline pilot survey data
represents the ratio of pilot signal power received to total received power at a mobile
station.
Claim 4
Dependent Claim
33 words
The method according to claim 1, wherein said step of setting includes the step of
tuning said first adjustment factor and said second adjustment factor until pilot signal
overlap and interference are minimized.
Claim 5
Dependent Claim
24 words
The method according to claim 1, further including the step of repeating said
steps of inputting, calculating and setting for different traffic channel loads.
Claim 6
Dependent Claim
60 words
The method according to claim 1, wherein said base station initial traffic loading
data are initial transmit E C /I O S, where E C /I O is the fractional total power received over a
particular pilot channel and where E C represents the energy per chip and I O represents
the total transmit power for a particular base station.
Claim 7
Dependent Claim
54 words
The method according to claim 1, wherein said baseline pilot survey data are test
mobile received E C /I O s, where E C /I O is the fractional total power received over a
particular pilot channel and where E C represents the energy per chip and I O represents
the total received power.
Claim 8
Dependent Claim
25 words
The method according to claim 1, wherein said selected pilot coverage area
criteria is minimization of pilot coverage overlap and interference from other base
stations
Claim 9
Dependent Claim
139 words
In a wireless communications system having at least one base station and means
for generating mobile received E C /I O s and initial transmit E C /I O s, a method for optimizing
interference under different power and loading conditions, said method comprising the
steps of: selecting values for a first adjustment factor and a second adjustment factor, said
first adjustment factor corresponding to base station power and said second adjustment
factor corresponding to traffic channel loading conditions; calculating new E C /l O s based on said mobile received E C /I O s, said initial transmit
E C /I O s, selected values of said first adjustment factor and selected values of said second
adjustment factor; and setting initial transmit power levels for said at least one base station based on a
selected pilot coverage criteria.
Claim 10
Dependent Claim
34 words
The method according to claim 9, wherein said step of setting includes the step of
tuning said first adjustment factor and said second adjustment factor until pilot signal
overlap and RF interference are minimized.
Claim 11
Dependent Claim
24 words
The method according to claim 10, further including the step of repeating said
steps of selecting, calculating and setting for different traffic channel loads.
Claim 12
Dependent Claim
51 words
The method according to claim 9, wherein: said base station initial traffic loading data represents the ratio of pilot signal
power to total power transmitted by a base station; and said baseline pilot survey data represents the ratio of pilot signal power received
to total received power at a mobile station.
Claim 13
Dependent Claim
108 words
In a wireless communications system having base stations and a mobile radio, a
device for optimizing radio frequency interference under different power and loading
conditions, said device comprising: a memory for storing baseline pilot survey data and base station initial traffic
loading information generated at the mobile radio and at the base stations; an interface for inputting values for a cell transmit power adjustment factor and a
cell traffic channel loading adjustment factor; and a processor for calculating pilot coverages based on said baseline pilot survey
data, said base station initial traffic loading information, said cell transmit power
adjustment factor and said cell traffic channel loading adjustment factor.
Claim 14
Dependent Claim
33 words
The device according to claim 13, further including a display for showing
optimized pilot coverages that are used by a user to set initial transmit power levels for
each of the base stations.
Claim 15
Dependent Claim
60 words
The device according to claim 13, wherein said base station initial traffic loading
information are initial transmit E C /I O s, where E C /I O is the fractional total power received
over a particular pilot channel and where E C represents the energy per chip and I O represents the total transmit power for a particular base station.
Claim 16
Dependent Claim
54 words
The device according to claim 13, wherein said baseline pilot survey data are test
mobile received E C /I O s, where E C /I O is the fractional total power received over a
particular pilot channel and where E C represents the energy per chip and I O represents
the total received power.
Claim 17
Dependent Claim
34 words
The device according to claim 13, wherein said interface and said processor are
operable to tune said first adjustment factor and said second adjustment factor until pilot
signal overlap and RF interference are minimized.
Claim 18
Independent Claim
90 words
A system for estimating pilot coverages for different operating conditions, said
system comprising: a memory for storing baseline pilot survey data generated at a test mobile and
base station initial traffic loading information generated at base stations; an interface for inputting values for cell transmit power adjustment factor and cell
traffic channel loading adjustment factor; and a processor for calculating pilot coverages based on said baseline pilot survey
data, said base station initial traffic loading information, said cell transmit power
adjustment factor and said cell traffic channel loading adjustment factor.
Claim 19
Dependent Claim
33 words
The system according to claim 18, further including a display for showing
optimized pilot coverages that are used by a user to set initial transmit power levels for
each of the base stations.
Claim 20
Dependent Claim
34 words
The device according to claim 19, wherein said interface and said processor are
operable to tune said first adjustment factor and said second adjustment factor until pilot
signal overlap and RF interference are minimized.
Claim 21
Dependent Claim
51 words
The system according to claim 18, wherein: said base station initial traffic loading data represents the ratio of pilot signal
power to total power transmitted by a base station; and said baseline pilot survey data represents the ratio of pilot signal power received
to total received power at a mobile station.
References Cited (Backward Citations)
No citation records indexed.
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