US5859839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for automatically selecting channel powers in a wireless communication system
Assignee: Motorola Solutions Inc
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Filing: 1997-06-30
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Granted: 1999-01-12
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Expires: 2017-06-30
Abstract
Abstract The method operates in a wireless communication system serving a geographic area. The system includes first and second communication units within the geographic area which have first and second radio frequency (RF) channels associated therewith. The method includes defining a plurality of points within the geographic area; selecting an initial power of the first and second RF channels; identifying, at each of the plurality of points, a number of the first and second RF channels which are receivable; evaluating a system performance metric; adjusting the initial power of one of the first and second RF channels; based on the adjusted power re-identifying, at each of the plurality of points, a number of the first and second RF channels which are receivable; re-evaluating the system performance metric; based on the re-evaluation, accepting the adjusted power; and downloading the adjusted power to the wireless communication system.
Inventors
- 👤 Mark T. Ahlenius
- 👤 Gerald P. Labedz
- 👤 Robert T. Love
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:22
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/30; H04W52/32; H04W16/00; H04W16/18
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
264 words
In a wireless communication system having a plurality of base stations within a geographic area, each of the plurality of base stations having a pilot-channel and a service area associated therewith, a method for automatically selecting a power of each of the pilot-channels, the method comprising the steps of: defining a plurality of points within the geographic area; setting a control parameter to an initial value; establishing an initial power of each of the pilot-channels; based on the established initial powers, determining, at each of the plurality of points, an interference level associated with each of the pilot-channels to form a first array; based on the selected initial powers, identifying, at each of the plurality of points, a number of the pilot-channels which are receivable, to form a second array; evaluating a system performance metric, the system performance metric based on the first array and the second array; randomly selecting one of the pilot-channels; changing the power of the selected one pilot-channel; after the step of changing, updating the first and second arrays; based on the updated first and second arrays, re-evaluating the system performance metric; based on the re-evaluation, accepting or rejecting the changed power of the selected one pilot-channel, to form a preferred set of pilot-channel power values; repeating, a predetermined number of times, the step of randomly selecting through the step of accepting or rejecting; adjusting the control parameter; repeating, until the control parameter reaches a predetermined threshold, the step of randomly selecting through the step of adjusting; and downloading the preferred set of pilot-channel values to the wireless communication system.
Claim 2
Dependent Claim
264 words
In a wireless communication system having a plurality of base stations within a geographic area, each of the plurality of base stations having a pilot-channel and a service area associated therewith, a method for automatically selecting a power of each of the pilot-channels, the method comprising the steps of: defining a plurality of points within the geographic area; setting a control parameter to an initial value; establishing an initial power of each of the pilot-channels; based on the established initial powers, determining, at each of the plurality of points, an interference level associated with each of the pilot-channels to form a first array; based on the selected initial powers, identifying, at each of the plurality of points, a number of the pilot-channels which are receivable, to form a second array; evaluating a system performance metric, the system performance metric based on the first array and the second array; randomly selecting one of the pilot-channels; changing the power of the selected one pilot-channel; after the step of changing, updating the first and second arrays; based on the updated first and second arrays, re-evaluating the system performance metric; based on the re-evaluation, accepting or rejecting the changed power of the selected one pilot-channel, to form a preferred set of pilot-channel power values; repeating, a predetermined number of times, the step of randomly selecting through the step of accepting or rejecting; adjusting the control parameter; repeating, until the control parameter reaches a predetermined threshold, the step of randomly selecting through the step of adjusting; and downloading the preferred set of pilot-channel values to the wireless communication system.
Claim 3
Dependent Claim
19 words
The method according to claim 1, wherein the wireless communication system comprises a code division multiple access (CDMA) system.
Claim 4
Dependent Claim
18 words
The method according to claim 1, wherein each of the plurality of points is located proximate a road.
Claim 5
Dependent Claim
32 words
The method according to claim 1, wherein the step of changing the power of the selected one pilot-channel comprises changing the power by an amount selected by a normalized random number generator.
Claim 6
Dependent Claim
14 words
The method according to claim 4, wherein the amount is at least one decibel.
Claim 7
Dependent Claim
16 words
The method according to claim 4, wherein the amount is a function of the control parameter.
Claim 8
Dependent Claim
30 words
The method according to claim 1, further comprising the step of: based on the changed power of the selected one pilot-channel, dividing the plurality of points among the service areas.
Claim 9
Dependent Claim
100 words
The method according to claim 7, further comprising the steps of: for each service area, at each of the plurality of points within each service area, estimating a power level; at each of the plurality of points within each service area, assigning one of a plurality of predetermined weighting values to the power level to form a power penalty value; summing the power penalty values over all of the plurality of points within each service area to form a service-area power penalty value; and summing the power penalty values of each service area to form a total power penalty value.
Claim 10
Dependent Claim
46 words
The method according to claim 8, wherein the power level at one point in one service area associated with one base station comprises: a power of the pilot-channel associated with the one base station and a forward traffic channel power associated with the one base station.
Claim 11
Dependent Claim
49 words
The method according to claim 8, wherein the interference level at one point in one service area associated with one base station comprises: a ratio of a power of the pilot-channel associated with the one base station to a the powers of the remainder of the plurality of pilot-channels.
Claim 12
Dependent Claim
107 words
The method according to claim 8, further comprising the steps of: at each of the plurality of points, assigning one of a plurality of predetermined weighting values to the interference level, to form an interference penalty value; summing the interference penalty values over all of the plurality of points to form a total interference penalty value; at each of the plurality of points, assigning one of the plurality of predetermined penalty values to the number of the pilot-channels which are receivable, to form a handoff penalty value; and summing the handoff penalty values over all of the plurality of points to form a total handoff penalty value.
Claim 13
Dependent Claim
45 words
The method according to claim 11, further comprising the steps of: after the step of defining the plurality of points within the geographic area, defining a plurality of sections within the geographic area; and assigning a priority value to each of the plurality of sections.
Claim 14
Dependent Claim
20 words
The method according to claim 12 wherein the priority level is based on one of traffic density and geographic location.
Claim 15
Dependent Claim
36 words
The method according to claim 12, wherein the step of re-evaluating the system metric is based on the priority values, the total interference penalty value, the total handoff penalty value and the total power penalty value.
Claim 16
Dependent Claim
23 words
The method according to claim 1, wherein the step of either accepting or rejecting is based on a value of the control parameter.
Claim 17
Dependent Claim
24 words
The method according to claim 1, further comprising the step of: measuring an acceptance rate of the changed power of the selected one pilot-channel.
Claim 18
Dependent Claim
36 words
The method according to claim 16, further comprising the step of: prohibiting the changing of the power of the selected one pilot-channel when the acceptance rate is below a predetermined threshold, to form a frozen pilot-channel.
Claim 19
Dependent Claim
21 words
The method according to claim 17, wherein the step of randomly selecting one of the pilot-channels comprises selecting a non-frozen pilot-channel.
References Cited (Backward Citations)
US4639914A
Cited
US5056109A
Cited
US5386588A
Cited
US5241690A
Cited
US5559790A
Cited
US5539728A
Cited
US5570353A
Cited
US5590409A
Cited
US5455821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |