US5812539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual mode satellite/cellular terminal
Assignee: Unwired Planet LLC
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Filing: 1997-03-11
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Granted: 1998-09-22
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Expires: 2017-03-11
Abstract
Abstract A method and apparatus of communicating information using Time Division Multiple Access and adaptive transmission and reception are disclosed. Signal bursts are transmitted from TDMA transmitters to a TDMA receiver wherein the transmitter codes the information and transmits coded information to the receiver using at least one of two timeslots of a plurality of timeslots in a repetitive TDMA frame period. Both of the two timeslots are received whether or not the transmitter has transmitted using one or two timeslots and the received signals are classified as intended and non-intended. Successively received signals classified as intended are then assembled into a block for decoding to reproduce the information. Also, transmission power levels of the bursts are controlled to compensate for propagation path changes.
Inventors
- 👤 Paul W. Dent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:27
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/28; H04W52/283; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1853; H04B7/18532; H04B7/18563; H04L; H04L1/00; H04L1/0001; H04L1/004; H04L1/0056; H04L1/0059; H04L1/0071; H04L1/08; H04W52/06; H04W52/24; H04W52/287; H04W52/288; H04W52/30; H04W88/00; H04W88/02; H04W88/06; H04B1/00; H04B1/38; H04B1/40; H04B1/403; H04B1/408; H04W52/08; H04W52/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A TDMA communication apparatus with improved transmitter power level control, comprising: burst receiving means for receiving TDMA signal bursts in an allocated receive timeslot of a repetitive TDMA frame period and for measuring received signal strength; burst transmission means for transmitting TDMA signal bursts in an allocated transmit timeslot of a repetitive TDMA frame period under control of a power control means; and transmit power control means for computing a desired effective burst transmission power level to compensate for propagation path changes based on said measured received signal strength and controlling said burst transmission means to transmit a signal burst at a controlled power level in said allocated transmit timeslot in each of said TDMA frame periods, wherein said transmit power control means controls said burst transmission means to skip transmission in certain frame periods such that the combination of said controlled power level with the average fraction of frames transmitted provides an effective communication transmit power level equal to said computed desired power level.
Claim 2
Dependent Claim
165 words
A TDMA communication apparatus with improved transmitter power level control, comprising: burst receiving means for receiving TDMA signal bursts in an allocated receive timeslot of a repetitive TDMA frame period and for measuring received signal strength; burst transmission means for transmitting TDMA signal bursts in an allocated transmit timeslot of a repetitive TDMA frame period under control of a power control means; and transmit power control means for computing a desired effective burst transmission power level to compensate for propagation path changes based on said measured received signal strength and controlling said burst transmission means to transmit a signal burst at a controlled power level in said allocated transmit timeslot in each of said TDMA frame periods, wherein said transmit power control means controls said burst transmission means to skip transmission in certain frame periods such that the combination of said controlled power level with the average fraction of frames transmitted provides an effective communication transmit power level equal to said computed desired power level.
Claim 3
Dependent Claim
18 words
A TDMA communications apparatus according to claim 1, wherein said certain frame periods are the odd-numbered frame periods.
Claim 4
Dependent Claim
18 words
A TDMA communications apparatus according to claim 1, wherein said certain frame periods are the even-numbered frame periods.
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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) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |