US5203013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio telephone system supporting busy and out-of-range function
Assignee: Motorola Solutions Inc
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Filing: 1990-09-10
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Granted: 1993-04-13
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Expires: 2010-09-10
Abstract
Abstract A radio telephone communication system (200) comprising a base station with at least one frequency agile transceiver (207) capable of time division duplex operation on at least one radio frequency channel. The base station operates to facilitate communication with at least one radio telephone (100) on the at least one radio frequency channel. The radio telephone communication system further comprises a radio telephone (100) capable of determining an acquisition status of the at least one frequency agile transceiver in the base station, the radio telephone (100) generating an indication representing a base station busy status (402) when one of: requesting a time division duplex communication link fails and bidirectional time division duplex communication is exists on the radio frequency channel; and requesting a time division duplex communication link fails and unidirectional time division duplex communication exists on the radio frequency channel and the unidirectional time division duplex communication originates from the base station.
Inventors
- 👤 Robert L. Breeden
- 👤 Gary S. Lobel
- 👤 Thomas V. D'Amico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:25
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04B; H04B1/00; H04B1/38; H04B1/40; H04M; H04M1/00; H04M1/72; H04M1/724; H04M1/725; H04M1/72502; H04M1/72516
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
135 words
In a radio telephone communication system having: a base station with at least one frequency agile transceiver capable of time division duplex operation on at least one radio frequency channel for facilitating communication with at least one radio telephone on the at least one radio frequency channel, a method of determining acquisition status of the at least one frequency agile transceiver in the base station comprising the steps of: at a radio telephone: providing an indication representing a base station busy status when one of: requesting a communication link fails and bidirectional time division duplex communication exists on the at least one radio frequency channel; and requesting a communication link fails and unidirectional time division duplex communication exists on the radio frequency channel and the unidirectional time division duplex communication originates from the base station.
Claim 2
Dependent Claim
135 words
In a radio telephone communication system having: a base station with at least one frequency agile transceiver capable of time division duplex operation on at least one radio frequency channel for facilitating communication with at least one radio telephone on the at least one radio frequency channel, a method of determining acquisition status of the at least one frequency agile transceiver in the base station comprising the steps of: at a radio telephone: providing an indication representing a base station busy status when one of: requesting a communication link fails and bidirectional time division duplex communication exists on the at least one radio frequency channel; and requesting a communication link fails and unidirectional time division duplex communication exists on the radio frequency channel and the unidirectional time division duplex communication originates from the base station.
Claim 3
Dependent Claim
48 words
The method according to claim 1 wherein the requesting step comprises the steps of: at the radio telephone: scanning a plurality of channels to find an available channel; and transmitting a signal over the available channel to the base station, the signal representing at least a link request.
Claim 4
Dependent Claim
45 words
The method according to claim 2 wherein the scanning step comprises the steps of: tuning the radio telephone to a channel, the channel being one of the plurality of channels; and measuring a power spectrum associated with the channel to provide a signal strength indication.
Claim 5
Dependent Claim
48 words
The method according to claim 3 wherein the measuring step further comprises the steps of: sampling the power spectrum associated with the channel at a predetermined time interval; and synchronizing with at least one received signal to determine if unidirectional time division duplex communication exists on the channel.
Claim 6
Dependent Claim
51 words
The method according to claim 4 further comprising the steps of: determining if the signal strength indication is above a predetermined magnitude; and providing the indication representing the base station busy status in response to the signal strength indication being above the predetermined magnitude and bidirectional time division duplex communication exits.
Claim 7
Dependent Claim
46 words
The method according to claim 4 wherein the providing step further indicates a base station busy status when unidirectional time division duplex communication exists on a channel and the unidirectional time division duplex communication includes at least a signal validly transmitted only by the base station.
Claim 8
Dependent Claim
44 words
The method according to claim 4 further comprising the steps of: determining if the signal strength indication is below a predetermined magnitude; and providing an indication representing a base station out-of-range status in response to the signal strength indication being below the predetermined magnitude.
Claim 9
Dependent Claim
49 words
The method according to claim 4 further comprising the step of: providing an indication representing a base station out-of-range status when unidirectional time division duplex communication exists on a channel and the unidirectional time division duplex communication lacks at least a signal validly transmitted only by the base station.
Claim 10
Dependent Claim
140 words
A radio telephone communication system, comprising: a base station with at least one frequency agile transceiver capable of time division duplex operation on at least one radio frequency channel for facilitating communication with at least one radio telephone on the at least one radio frequency channel; and a radio telephone capable of determining an acquisition status of the at least one frequency agile transceiver in the base station, the radio telephone comprising: means for providing an indication representing a base station busy status when one of: requesting a time division duplex communication link fails and bidirectional time division duplex communication is exists on the radio frequency channel; and requesting a time division duplex communication link fails and unidirectional time division duplex communication exists on the radio frequency channel and the unidirectional time division duplex communication originates from the base station.
Claim 11
Dependent Claim
140 words
A radio telephone communication system, comprising: a base station with at least one frequency agile transceiver capable of time division duplex operation on at least one radio frequency channel for facilitating communication with at least one radio telephone on the at least one radio frequency channel; and a radio telephone capable of determining an acquisition status of the at least one frequency agile transceiver in the base station, the radio telephone comprising: means for providing an indication representing a base station busy status when one of: requesting a time division duplex communication link fails and bidirectional time division duplex communication is exists on the radio frequency channel; and requesting a time division duplex communication link fails and unidirectional time division duplex communication exists on the radio frequency channel and the unidirectional time division duplex communication originates from the base station.
Claim 12
Dependent Claim
51 words
The radio telephone communication system according to claim 9 wherein the means for providing an indication comprises: means for scanning a plurality of channels to find an available channel; and means for transmitting a signal over the available channel to the base station, the signal representing at least a link request.
Claim 13
Dependent Claim
108 words
The radio telephone communication system according to claim 10 wherein the means for scanning comprises: means for tuning the radio telephone to a channel, the channel being one of the plurality of channels; means for sampling a power spectrum associated with the channel at a predetermined time interval to provide a signal strength indication; means for determining if the signal strength indication is above a predetermined magnitude; and means for synchronizing with at least one received signal when the signal strength indication is above the predetermined magnitude for determining if time division duplex communication exits on the channel, resulting in the indication representing the base station busy status.
Claim 14
Dependent Claim
54 words
The radio telephone communication system according to claim 11 wherein the means for providing an indication representing a base station busy status indicates said status when unidirectional time division duplex communication exists on a channel and the unidirectional time division duplex communication includes at least a signal validly transmitted only by the base station.
Claim 15
Dependent Claim
48 words
The radio telephone communication system according to claim 11 further comprising: means for determining if the signal strength indication is below a predetermined magnitude; and means for providing an indication representing a base station out-of-range status in response to the signal strength indication being below the predetermined magnitude.
Claim 16
Dependent Claim
51 words
The radio telephone communication system according to claim 11 further comprising: means for providing an indication representing a base station out-of-range status when unidirectional time division duplex communication exists on a channel and the unidirectional time division duplex communication lacks at least a signal validly transmitted only by the base station.
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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |