US6167260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for demand channel change for a radio telephone
Assignee: Motorola Solutions Inc
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Filing: 1996-01-31
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Granted: 2000-12-26
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Expires: 2016-01-31
Abstract
Abstract A radiotelephone system (100) includes a radiotelephone (102) and a central device (104) that communicate via radio frequency (RF) signals. The radiotelephone (102) includes a user interface (114) which permits the user to request a channel change by the central device. A signal is communicated to the user if a channel change is denied. A channel scan can be conducted by the radiotelephone to identify a new channel.
Inventors
- 👤 Zafarul Azam
- 👤 Douglas W. Main
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:56
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A method of operating a radiotelephone to perform an on demand channel change in a cellular system including at least one central device, the radiotelephone including a transceiver, a manually actuated user input and a controller, the method comprising the steps of: generating a channel change request responsive to actuation of the manually actuated user input during an active call; controlling the transceiver to transmit a channel change request to the central device responsive to the channel change request; changing to a new channel identified by the central device if a first reply signal is received from the central device; controlling the user interface to generate a display signal for a user confirming that a channel change is not available if a second reply signal is received from the central device; and performing a channel scan if a channel scan request signal is received from the central device, wherein the step of performing a channel scan includes scanning a list of channels received from the central device and said step of scanning includes scanning those channels in the list.
Claim 2
Independent Claim
179 words
A method of operating a radiotelephone to perform an on demand channel change in a cellular system including at least one central device, the radiotelephone including a transceiver, a manually actuated user input and a controller, the method comprising the steps of: generating a channel change request responsive to actuation of the manually actuated user input during an active call; controlling the transceiver to transmit a channel change request to the central device responsive to the channel change request; changing to a new channel identified by the central device if a first reply signal is received from the central device; controlling the user interface to generate a display signal for a user confirming that a channel change is not available if a second reply signal is received from the central device; and performing a channel scan if a channel scan request signal is received from the central device, wherein the step of performing a channel scan includes scanning a list of channels received from the central device and said step of scanning includes scanning those channels in the list.
References Cited (Backward Citations)
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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) | 2003-12-26 | 2004-06-26 | 2004-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-26 | 2008-06-26 | 2008-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-26 | 2012-06-26 | 2012-12-26 | $7700.00 | Window Closed / Lapsed |