US5684790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile communication system
Assignee: Mitsubishi Electric Corp
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Filing: 1995-07-11
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Granted: 1997-11-04
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Expires: 2015-07-11
Abstract
Abstract A mobile communication system that can preliminarily inform a user of the possibility of an occurrence of interruption of a call, which is peculiar to the system of the TDMA type. In this mobile communication system, a CPU measures a received level of speech quality by detecting data representing speech quality in an SACCH frame on the basis of a result of analysis of a received frame by means of a receiving portion. In the case where the received level is less than a predetermined value, a counting portion is caused to start counting. If the received level is low in the case of the next SACCH frame, the count is incremented. When the count reaches a predetermined value, a speaker serving as alarming means is operated so as to produce a warning tone. Thereby, a warning is given to a person who is currently using the system.
Inventors
- 👤 Kazuhiro Hirasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:26
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
A mobile communication system for transmitting and receiving data by performing time division multiple-accessing, comprising at least one base station and at least one mobile station, said at least one mobile station including; an alarming means for alarming according to an alarm control signal; and a control means for outputting said alarm control signal to said alarming means according to a comparison between a received level, which is obtained on the basis of a result of a detection of speech quality by said control means of an arbitrary frame within received frames as received by said control means, and a predetermined level; wherein the mobile station has a counter portion for counting the number of times, at which the received level is less than the predetermined level, according to results of the comparisons between the received level and the predetermined level, which is made by the control means, wherein the control means is adapted to measure a received level by, each time when a frame is received, detecting data representing speech quality within the frame, and to further output an alarm control signal when it is known from data representing the number of times counted by the counter portion that received levels, which are successively obtained a predetermined number of times, are less than the predetermined level.
Claim 2
Dependent Claim
217 words
A mobile communication system for transmitting and receiving data by performing time division multiple-accessing, comprising at least one base station and at least one mobile station, said at least one mobile station including; an alarming means for alarming according to an alarm control signal; and a control means for outputting said alarm control signal to said alarming means according to a comparison between a received level, which is obtained on the basis of a result of a detection of speech quality by said control means of an arbitrary frame within received frames as received by said control means, and a predetermined level; wherein the mobile station has a counter portion for counting the number of times, at which the received level is less than the predetermined level, according to results of the comparisons between the received level and the predetermined level, which is made by the control means, wherein the control means is adapted to measure a received level by, each time when a frame is received, detecting data representing speech quality within the frame, and to further output an alarm control signal when it is known from data representing the number of times counted by the counter portion that received levels, which are successively obtained a predetermined number of times, are less than the predetermined level.
Claim 3
Dependent Claim
35 words
The mobile communication system according to claim 1, wherein the control means is adapted to detect data representing speech quality in a slow associated channel frame every time a slow associated channel frame is received.
Claim 4
Dependent Claim
33 words
The mobile communication system according to claim 1, wherein the control means is adapted to detect data representing speech quality in a traffic channel frame every time a traffic channel frame is received.
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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) | 2000-11-03 | 2001-05-05 | 2001-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-03 | 2005-05-05 | 2005-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-03 | 2009-05-05 | 2009-11-04 | $7700.00 | Window Closed / Lapsed |