US5794147A
Expired / Lapsed
US
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Method and system for quickly finding a control channel in a private cellular system
Assignee: Nortel Networks Ltd
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Filing: 1996-09-13
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Granted: 1998-08-11
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Expires: 2016-09-13
Abstract
Abstract The method of quickly locating non-standard control channels in private cellular systems is accomplished in an embodiment of the present invention by determining the modulation type of a particular channel. The mobile station scans a received RF channel. The received signal is used for the evaluation of the modulation type of that channel by using matched filters designed for the specific signal of interest, and/or in another embodiment of the present invention is used for producing the spectral energy distribution of the channel revealing the type of modulation.
Inventors
- 👤 Chenhong Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:32
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/0012; H04W; H04W48/00; H04W48/16; H04W88/00; H04W88/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
109 words
In a radio communication system utilizing a plurality of channels, a method for identifying one of the channels as a control channel including the steps of: accepting an input signal from one of said channels; comparing said input signal to a predetermined baseline signal by passing said input signal through a spectrum analyzer configured to identify a predetermined characteristic of the input signal; identifying the input signal as a control channel based on a predetermined characteristic of the comparison result; wherein the radio communication system is a mobile radiotelephone system and the plurality of channels is divided into a plurality of voice/data channels and a plurality of control channels.
Claim 2
Dependent Claim
109 words
In a radio communication system utilizing a plurality of channels, a method for identifying one of the channels as a control channel including the steps of: accepting an input signal from one of said channels; comparing said input signal to a predetermined baseline signal by passing said input signal through a spectrum analyzer configured to identify a predetermined characteristic of the input signal; identifying the input signal as a control channel based on a predetermined characteristic of the comparison result; wherein the radio communication system is a mobile radiotelephone system and the plurality of channels is divided into a plurality of voice/data channels and a plurality of control channels.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the step of comparing further includes the step of comparing the signal to a plurality of predetermined signals.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the predetermined signal has characteristics identifiable as one of the group of FM, QPSK and FSK modulation types.
Claim 5
Dependent Claim
16 words
The method of claim 3 further including the step of: storing the channel number so identified.
Claim 6
Dependent Claim
43 words
The method of claim 1 wherein the comparing steps include: spectrally analyzing the input signal; determining spectral characteristics of the input signal; comparing the spectral characteristics of the input signal with a predefined baseline signal; and generating a result based on said comparison.
Claim 7
Dependent Claim
37 words
The method of claim 5 further including the steps of: identifying the input signal as a control signal; and selecting a channel identified as containing a control signal for initiating and controlling communication with a base station.
Claim 8
Dependent Claim
33 words
The method of claim 6 further including, prior to spectrally analyzing, the steps of: normalizing the input signal; and converting the signal from the time domain to frequency domain in near real time.
Claim 9
Independent Claim
116 words
A method of identifying and selecting a control channel from a plurality of voice/data channels within a cellular network including a base station and a mobile unit, the method comprising the steps of: accepting an input signal from one of said channels; comparing said input signal to a predetermined baseline signal by comparing characteristics of the signal to a plurality of previously stored characteristics, each of the stored characteristics indicative of a modulation type of the input signal; identifying the input signal as a control channel based on said modulation type; selecting a channel identified as containing a control signal for initiating and controlling communication with a base station; and storing the channel number in memory.
Claim 10
Independent Claim
116 words
A method of identifying and selecting a control channel from a plurality of voice/data channels within a cellular network including a base station and a mobile unit, the method comprising the steps of: accepting an input signal from one of said channels; comparing said input signal to a predetermined baseline signal by comparing characteristics of the signal to a plurality of previously stored characteristics, each of the stored characteristics indicative of a modulation type of the input signal; identifying the input signal as a control channel based on said modulation type; selecting a channel identified as containing a control signal for initiating and controlling communication with a base station; and storing the channel number in memory.
Claim 11
Dependent Claim
96 words
A mobile unit for use in a wireless telephone system comprising: means for receiving an input signal; means for comparing said input signal to a predetermined baseline signal; means for generating a comparison result based on the comparison of the baseline and input signal, said means for generating further including means for determining spectral characteristics of the input signal; means for identifying the input signal as a control channel based on a predetermined characteristic of the comparison result; and means for selecting the identified control channel identified for initiating and controlling communication with a base station.
Claim 12
Dependent Claim
96 words
A mobile unit for use in a wireless telephone system comprising: means for receiving an input signal; means for comparing said input signal to a predetermined baseline signal; means for generating a comparison result based on the comparison of the baseline and input signal, said means for generating further including means for determining spectral characteristics of the input signal; means for identifying the input signal as a control channel based on a predetermined characteristic of the comparison result; and means for selecting the identified control channel identified for initiating and controlling communication with a base station.
Claim 13
Dependent Claim
35 words
A mobile unit as in claim 9 further comprising: means for comparing the input signal spectral characteristics to predetermined characteristics of a baseline signal; and means for identifying the input signal as a control signal.
Claim 14
Dependent Claim
29 words
A mobile unit as in claim 10 further comprising: means for selecting a channel identified as containing a control signal for initiating and controlling communication with a base station.
Claim 15
Dependent Claim
25 words
A mobile unit as in claim 11 further comprising: means for converting the signal from the time domain to frequency domain in near real time.
Claim 16
Dependent Claim
19 words
A mobile unit as in claim 12 further comprising: means for normalizing the input signal prior to spectrally analyzing.
Claim 17
Dependent Claim
17 words
A mobile unit as in claim 13 further comprising means for storing the channel number so identified.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-10 | 2002-02-09 | 2002-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-10 | 2006-02-09 | 2006-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-10 | 2010-02-09 | 2010-08-11 | $7700.00 | Window Closed / Lapsed |