US5764699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for providing adaptive modulation in a radio communication system
Assignee: Motorola Solutions Inc
•
Filing: 1994-03-31
•
Granted: 1998-06-09
•
Expires: 2014-03-31
Abstract
Abstract A method for providing adaptive modulation in a radio communication system employs a plurality of data modulation techniques (207). A two-way communication unit (100) automatically selects (318) from amongst the plurality of data modulation techniques (207), and uses the selected data modulation technique to transmit (308) data.
Inventors
- 👤 Michael L. Needham
- 👤 Kenneth J. Crisler
- 👤 Stephen S. Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:34
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0001; H04L1/0015; H04L1/0019; H04L1/002; H04L1/0002; H04L1/0003; H04L1/0023; H04L1/0026; H04L1/12; H04L1/16; H04L1/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
A method of adaptively selecting from amongst a plurality of data modulation techniques to use when transmitting data comprising the steps of: in a two-way communication unit: transmitting data using a first data modulation technique of said plurality of data modulation techniques; receiving a message that includes information that at least reflects upon quality of transmission of the data; automatically selecting, as a function of both the information that at least reflects upon quality of transmission of the data and previously stored information that reflects upon quality of previous transmissions of data, a second data modulation technique from said plurality of data modulation techniques; and using the second data modulation technique for subsequent transmissions of data.
Claim 2
Independent Claim
116 words
A method of adaptively selecting from amongst a plurality of data modulation techniques to use when transmitting data comprising the steps of: in a two-way communication unit: transmitting data using a first data modulation technique of said plurality of data modulation techniques; receiving a message that includes information that at least reflects upon quality of transmission of the data; automatically selecting, as a function of both the information that at least reflects upon quality of transmission of the data and previously stored information that reflects upon quality of previous transmissions of data, a second data modulation technique from said plurality of data modulation techniques; and using the second data modulation technique for subsequent transmissions of data.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said subsequent transmissions of data involves new data.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein said subsequent transmissions of data involves data that was previously transmitted.
Claim 5
Dependent Claim
15 words
The method of claim 1, wherein the data modulation techniques include four discrete modulation techniques.
Claim 6
Dependent Claim
24 words
The method of claim 4, wherein said four discrete modulation techniques include quadrature phase shift keyed modulation, 16-quadrature amplitude modulation (QAM), 64-QAM, and 256-QAM.
Claim 7
Dependent Claim
24 words
The method of claim 1, further including the step of storing the information that at least reflects upon quality of transmission of the data.
Claim 8
Dependent Claim
34 words
The method of claim 1, wherein the step of receiving a message that includes information that at least reflects upon quality of transmission of the data involves receiving a direct measurement of signal quality.
Claim 9
Dependent Claim
21 words
The method of claim 7, wherein the measurement of signal quality is a function of a ratio of signal to noise-plus-interference.
Claim 10
Dependent Claim
36 words
The method of claim 1, wherein the step of receiving a message that includes information that at least reflects upon quality of transmission of the data involves receiving an indication of errors detected during data transmission.
Claim 11
Dependent Claim
25 words
The method of claim 9, wherein the step of automatically selecting a second data modulation technique is a function of the indication of errors detected.
Claim 12
Dependent Claim
35 words
The method of claim 10, wherein the step of selecting the second data modulation technique as a function of the indication of errors detected involves calculating an estimate of a ratio of signal to noise-plus-interference.
Claim 13
Independent Claim
141 words
A method of adaptively selecting from amongst at least two data modulation techniques to use when transmitting data, comprising the steps of: in a first two-way communication unit: maintaining stored information regarding quality of previous transmissions of data; transmitting to a second two-way communication unit at least one block of data using a first data modulation technique from said at least two modulation techniques; receiving from the second two-way communication unit at least a selective automatic-repeat-request feedback message; automatically selecting, as a function of both information contained in the selective automatic-repeat-request feedback message and the stored information, a second data modulation technique from said at least two data modulation techniques; updating the stored information to include at least some of the information contained in the selective automatic-repeat-request feedback message; and using the second data modulation technique for subsequent transmissions of data.
Claim 14
Independent Claim
141 words
A method of adaptively selecting from amongst at least two data modulation techniques to use when transmitting data, comprising the steps of: in a first two-way communication unit: maintaining stored information regarding quality of previous transmissions of data; transmitting to a second two-way communication unit at least one block of data using a first data modulation technique from said at least two modulation techniques; receiving from the second two-way communication unit at least a selective automatic-repeat-request feedback message; automatically selecting, as a function of both information contained in the selective automatic-repeat-request feedback message and the stored information, a second data modulation technique from said at least two data modulation techniques; updating the stored information to include at least some of the information contained in the selective automatic-repeat-request feedback message; and using the second data modulation technique for subsequent transmissions of data.
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) | 2001-06-08 | 2001-12-08 | 2002-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-08 | 2005-12-08 | 2006-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-08 | 2009-12-08 | 2010-06-09 | $7700.00 | Window Closed / Lapsed |