US5528664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular data overlay system providing packet-switched communication data service over a selected channel which is not in use by a circuit-switched communication subsystem
Assignee: Harris Stratex Networks Canada ULC
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Filing: 1994-10-26
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Granted: 1996-06-18
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Expires: 2014-10-26
Abstract
Abstract A cellular telephone system includes a packet-switched digital data communication subsystem overlaying a circuit-switched (e.g., voice) communication subsystem, with voice and data services sharing the same voice channels. The voice communication subsystem provides voice services independently of the operation of the data communication subsystem. On the other hand, the data communication subsystem monitors use of the voice channels for voice communication, and, in response thereto, temporarily allocates one or more of the available voice channels for data service. In a preferred embodiment, each data basestation transmits, from time to time, an available-channel signature to identify those, if any, of the data-allocated channels that are not then being used to transmit voice or data. For data communication, a remote unit monitors selected voice channels in the coverage area of the cellular telephone system for available-channel signatures, selects one of the channels (if any) identified by the signature thereon as being available for data transmission, and transmits or receives digital information over that channel.
Inventors
- 👤 Arunas G. Slekys
- 👤 William A. Gage
- 👤 William E. Andrietz
- 👤 Duane Sharman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/50; H04W72/54; H04W72/542; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/18; H04W16/00; H04W16/24; H04W16/32; H04W24/00; H04W76/00; H04W76/20; H04W76/28; H04W88/00; H04W88/02; H04W88/06; H04W88/08; H04W88/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
209 words
A cellular telephone system comprising: A) a voice communication subsystem including at least one voice basestation for providing circuit-switched voice service over a plurality of voice channels; and B) a data communication subsystem including at least one data basestation for providing packet-switched data service over one or more of said voice channels; C) wherein said voice basestation includes a voice basestation transceiver for transmitting control signals over at least one control channel and voice signals over said voice channels, said voice communication subsystem providing said circuit-switched voice service independently of the packet-switched data service provided by said data communication subsystem; and D) wherein said data communication subsystem includes basestation monitoring means for monitoring the use of voice channels by said voice communication subsystem, a data basestation transceiver for transmitting data signals over said voice channels, and data basestation processor means responsive to said monitoring means for controlling said data communication transceiver means to transmit data signals over a selected voice channel when said basestation monitoring means determines that said voice communication subsystem is not then transmitting over the selected voice channel, and to refrain from transmitting over the selected voice channel whenever said basestation monitoring means determines that said voice communication subsystem is transmitting over the selected voice channel.
Claim 2
Dependent Claim
209 words
A cellular telephone system comprising: A) a voice communication subsystem including at least one voice basestation for providing circuit-switched voice service over a plurality of voice channels; and B) a data communication subsystem including at least one data basestation for providing packet-switched data service over one or more of said voice channels; C) wherein said voice basestation includes a voice basestation transceiver for transmitting control signals over at least one control channel and voice signals over said voice channels, said voice communication subsystem providing said circuit-switched voice service independently of the packet-switched data service provided by said data communication subsystem; and D) wherein said data communication subsystem includes basestation monitoring means for monitoring the use of voice channels by said voice communication subsystem, a data basestation transceiver for transmitting data signals over said voice channels, and data basestation processor means responsive to said monitoring means for controlling said data communication transceiver means to transmit data signals over a selected voice channel when said basestation monitoring means determines that said voice communication subsystem is not then transmitting over the selected voice channel, and to refrain from transmitting over the selected voice channel whenever said basestation monitoring means determines that said voice communication subsystem is transmitting over the selected voice channel.
Claim 3
Dependent Claim
50 words
The cellular telephone system in accordance with claim 1 wherein said basestation monitoring means identifies the voice channel or channels which are not being used for voice service, and said data communication subsystem provides data service on one or more of said voice channels identified by said basestation monitoring means.
Claim 4
Dependent Claim
59 words
The cellular telephone system in accordance with claim 2, wherein said basestation monitoring means includes means for scanning power levels of signals produced by said voice communication subsystem over said voice channels, said basestation monitoring means determining a voice channel is not in use when the power levels of the signals on the channel are below a predetermined threshold.
Claim 5
Dependent Claim
156 words
A cellular telephone system comprising: A) a circuit-switched communication subsystem for providing circuit-switched communication service over a plurality of radio-frequency channels; and B) a data communication subsystem for providing packet-switched data communication service over one or more of said radio-frequency channels; C) said circuit-switched communication subsystem i) using at least one control channel in association with said circuit-switched communication service; and ii) providing said circuit-switched communication service independently of the packet-switched data communication data service of said data communication subsystem; and D) said data communication subsystem including monitoring means for monitoring the circuit-switched communication service of said circuit-switched communication subsystem, and processor means for, in response thereto, controlling said packet-switched communication data service, to provide packet-switched communication data service over a selected channel which is not in use by said circuit-switched communications subsystem and to refrain from providing packet-switched communication data over said selected channel whenever said channel is in use by said circuit-switched communication subsystem.
Claim 6
Dependent Claim
156 words
A cellular telephone system comprising: A) a circuit-switched communication subsystem for providing circuit-switched communication service over a plurality of radio-frequency channels; and B) a data communication subsystem for providing packet-switched data communication service over one or more of said radio-frequency channels; C) said circuit-switched communication subsystem i) using at least one control channel in association with said circuit-switched communication service; and ii) providing said circuit-switched communication service independently of the packet-switched data communication data service of said data communication subsystem; and D) said data communication subsystem including monitoring means for monitoring the circuit-switched communication service of said circuit-switched communication subsystem, and processor means for, in response thereto, controlling said packet-switched communication data service, to provide packet-switched communication data service over a selected channel which is not in use by said circuit-switched communications subsystem and to refrain from providing packet-switched communication data over said selected channel whenever said channel is in use by said circuit-switched communication subsystem.
Claim 7
Dependent Claim
57 words
The cellular telephone system in accordance with claim 4, wherein said data communication subsystem monitors use of said radio-frequency channels by said circuit-switched communication subsystem to identify the radio-frequency channel or channels which are not being used for circuit-switched service, and, in response thereto, allocates one or more of said identified radio-frequency channels for said data service.
Claim 8
Dependent Claim
35 words
The cellular telephone system in accordance with claim 5, wherein said data communication subsystem identifies radio-frequency channels not being used for circuit-switched service by monitoring power levels of signals produced by said circuit-switched communication subsystem.
Claim 9
Dependent Claim
50 words
The cellular telephone system in accordance with claim 1, wherein said data communication subsystem includes a least one data basestation, said data basestation transmitting, from time to time, an available-channel signature to identify those, if any, of the radio-frequency channels that are not then being used in circuit-switched communication service.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-18 | 1999-12-18 | 2000-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-18 | 2003-12-18 | 2004-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-18 | 2007-12-18 | 2008-06-18 | $7700.00 | Window Closed / Lapsed |