US5648955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for power control in a TDMA spread spectrum communication system
Assignee: Intel Corp
•
Filing: 1995-06-07
•
Granted: 1997-07-15
•
Expires: 2015-06-07
Abstract
Abstract A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place and receive telephone calls, in which the user stations are provided a secure voice or data link and have the ability to handoff calls between base stations while such calls are in progress. Each base station has a set of "air channels" to which it transmits in sequence. The air channels supported by each base station are called that base station's "polling loop". A user station receives general polling information on an unoccupied air channel, transmits responsive information to the base station, and awaits acknowledgment from the base station. Each base station may therefore simultaneously maintain communication with as many user stations as there are air channels in its polling loop. The ability of a user station to communicate on any unoccupied air channel makes the protocol air-channel agile, while the stability of user station and base station clocks may define air channels, gaps, and minor frames.
Inventors
- 👤 Ryan N. Jensen
- 👤 Logan Scott
- 👤 Claude M. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:13
CPC Classifications
H; H04; H04W; H04W74/00; H04W74/04; H04W74/06; G; G10; G10L; G10L19/00; G10L19/012; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2618; H04B7/2643; H04L; H04L1/00; H04L1/0001; H04L1/0002; H04L1/0023; H04L1/0025; H04L1/20; H04L47/00; H04L47/50; H04L47/52; H04L47/522; H04L47/62; H04L47/6215; H04L49/00; H04L49/90; H04L49/901; H04W36/00; H04W36/0005; H04W36/0055; H04W36/0058; H04W36/24; H04W36/30; H04W36/302; H04W52/00; H04W52/04; H04W52/06; H04W52/08; H04W52/30; H04W52/36; H04W52/38; H04W52/40; H04W72/00; H04W72/20; H04W8/00; H04W8/02; H04W8/04; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805; H04B7/10; H04B7/2662; H04B7/2668; H04W24/00; H04W24/10; H04W36/16; H04W36/18; H04W52/18; H04W52/24; H04W52/362; H04W52/367; H04W56/00; H04W72/04; H04W72/044; H04W72/0446; H04W76/00; H04W76/10; H04W92/00; H04W92/04; H04W92/12
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
183 words
In a time division multiple access communication system having a base station and a plurality of user stations, a method for closed loop power control comprising the steps of transmitting with a power level, in a designated minor time frame of a major time frame, a pulse signal from a user station to a base station, receiving said pulse signal at said base station, measuring an indication of link quality based on said pulse signal, transmitting, in said designated minor time frame of said major time frame and following said pulse signal, a first spread spectrum signal from said base station to said user station, said first spread spectrum signal comprising a power adjustment command, receiving said first spread spectrum signal at said user station, adjusting said power level at said user station in response to said power adjustment command, transmitting, in said designated minor time frame of said major time frame and following said first spread spectrum signal, a second spread spectrum signal from said user station to said base station, and receiving said second spread spectrum signal at said base station.
Claim 2
Dependent Claim
183 words
In a time division multiple access communication system having a base station and a plurality of user stations, a method for closed loop power control comprising the steps of transmitting with a power level, in a designated minor time frame of a major time frame, a pulse signal from a user station to a base station, receiving said pulse signal at said base station, measuring an indication of link quality based on said pulse signal, transmitting, in said designated minor time frame of said major time frame and following said pulse signal, a first spread spectrum signal from said base station to said user station, said first spread spectrum signal comprising a power adjustment command, receiving said first spread spectrum signal at said user station, adjusting said power level at said user station in response to said power adjustment command, transmitting, in said designated minor time frame of said major time frame and following said first spread spectrum signal, a second spread spectrum signal from said user station to said base station, and receiving said second spread spectrum signal at said base station.
Claim 3
Dependent Claim
44 words
The method of claim 1 wherein said step of measuring an indication of link quality comprises the step of measuring at least one of a received power of said pulse signal, an envelope of said pulse signal, and a phase of said pulse signal.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said indication of link quality comprises a signal-to-noise ratio.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said indication of link quality comprises a degree of measured error.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said power adjustment command comprises a plurality of command bits.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein said power adjustment command comprises one of a discrete set of predefined command values.
Claim 8
Dependent Claim
33 words
The method of claim 1 wherein said step of adjusting said power level comprises the step of increasing or decreasing said power level by a relative amount indicated by said power adjustment command.
Claim 9
Independent Claim
173 words
A method for closed loop power control in a time division multiple access communication system, comprising the steps of transmitting at periodic intervals a control pulse from a user station to a base station, said base station capable of communicating with a plurality of user stations using time division multiplexing, receiving said control pulse at said base station, calculating a received signal strength indication in response to each control pulse, transmitting, after each control pulse and within a predetermined time interval, a spread-spectrum forward link communication message from said base station to said user station, said spread-spectrum forward link communication message comprising a power adjustment command, receiving said spread-spectrum forward link communication message including said power adjustment command at said user station, transmitting, after receiving said spread-spectrum forward link communication message from said base station, a spread-spectrum reverse link communication message from said user station to said base station, using a power level selected in response to said power adjustment command, and receiving said spread-spectrum reverse link communication message at said base station.
Claim 10
Independent Claim
173 words
A method for closed loop power control in a time division multiple access communication system, comprising the steps of transmitting at periodic intervals a control pulse from a user station to a base station, said base station capable of communicating with a plurality of user stations using time division multiplexing, receiving said control pulse at said base station, calculating a received signal strength indication in response to each control pulse, transmitting, after each control pulse and within a predetermined time interval, a spread-spectrum forward link communication message from said base station to said user station, said spread-spectrum forward link communication message comprising a power adjustment command, receiving said spread-spectrum forward link communication message including said power adjustment command at said user station, transmitting, after receiving said spread-spectrum forward link communication message from said base station, a spread-spectrum reverse link communication message from said user station to said base station, using a power level selected in response to said power adjustment command, and receiving said spread-spectrum reverse link communication message at said base station.
Claim 11
Dependent Claim
26 words
The method of claim 8 wherein said power level is offset by a relative amount according to said power adjustment command from a previous power level.
Claim 12
Dependent Claim
20 words
The method of claim 8 wherein said power adjustment command comprises one of a discrete set of predefined command values.
Claim 13
Independent Claim
133 words
A method for closed loop power control in a spread spectrum, time division multiple access communication system, comprising the steps of monitoring at a base station a received strength of a user station signal periodically transmitted from a user station, said base station capable of communicating over a designated frequency band with a plurality of user stations using time division multiplexing, transmitting from said base station a base-to-user spread spectrum message immediately following said user station signal, said base-to-user spread spectrum message comprising a power adjustment command, and receiving at said base station, within a predetermined time interval, a user-to-base spread spectrum message immediately following said base-to-user spread spectrum message, said user-to-base spread spectrum message being transmitted with a power level set at said user station in response to said power adjustment command.
Claim 14
Independent Claim
133 words
A method for closed loop power control in a spread spectrum, time division multiple access communication system, comprising the steps of monitoring at a base station a received strength of a user station signal periodically transmitted from a user station, said base station capable of communicating over a designated frequency band with a plurality of user stations using time division multiplexing, transmitting from said base station a base-to-user spread spectrum message immediately following said user station signal, said base-to-user spread spectrum message comprising a power adjustment command, and receiving at said base station, within a predetermined time interval, a user-to-base spread spectrum message immediately following said base-to-user spread spectrum message, said user-to-base spread spectrum message being transmitted with a power level set at said user station in response to said power adjustment command.
Claim 15
Dependent Claim
29 words
The method of claim 11 wherein said user station signal, said base-to-user spread spectrum message, and said user-to-base spread spectrum message are each transmitted over the same frequency band.
Claim 16
Dependent Claim
14 words
The method of claim 11 wherein said user station comprises a spread spectrum code.
Claim 17
Dependent Claim
20 words
The method of claim 11 wherein said power adjustment command comprises one of a discrete set of predefined command values.
Claim 18
Independent Claim
200 words
A method for closed loop power control in a time division multiple access communication system, comprising the steps of transmitting, during each minor time frame of a major time frame in which any of a plurality of user stations is in established communication with a base station, a control pulse from a corresponding one of said user stations to said base station, receiving said control pulse from each of said user stations at said base station, transmitting, in response to each of said control pulses and within the same minor time frame of the same major time frame, a power adjustment command from said base station to the user station which sent the control pulse, said power adjustment command based on a received signal quality of said control pulse, receiving said power adjustment command at the user station which sent the control pulse, adjusting a power level at the user station which sent the control pulse, transmitting, in the same minor time frame and same major time frame as said power adjustment command, a spread spectrum signal from the user station which sent the control pulse to said base station, and receiving said spread spectrum signal at said base station.
Claim 19
Independent Claim
200 words
A method for closed loop power control in a time division multiple access communication system, comprising the steps of transmitting, during each minor time frame of a major time frame in which any of a plurality of user stations is in established communication with a base station, a control pulse from a corresponding one of said user stations to said base station, receiving said control pulse from each of said user stations at said base station, transmitting, in response to each of said control pulses and within the same minor time frame of the same major time frame, a power adjustment command from said base station to the user station which sent the control pulse, said power adjustment command based on a received signal quality of said control pulse, receiving said power adjustment command at the user station which sent the control pulse, adjusting a power level at the user station which sent the control pulse, transmitting, in the same minor time frame and same major time frame as said power adjustment command, a spread spectrum signal from the user station which sent the control pulse to said base station, and receiving said spread spectrum signal at said base station.
Claim 20
Dependent Claim
14 words
The method of claim 15 wherein said control pulse comprises a plurality of chips.
Claim 21
Independent Claim
128 words
A method for power control in a time division multiple access communication system, comprising the steps of: transmitting, over a designated frequency band and in a minor time frame of each one of a series of major time frames, a spread-spectrum user station signal from a user station to a base station, receiving said spread-spectrum user station signal at said base station, transmitting, within a predetermined interval following said spread-spectrum user station signal and over said designated frequency band, a spread-spectrum base station signal from said base station to said user station, said spread-spectrum base station signal comprising a power adjustment command, receiving said spread-spectrum base station signal at said user station, and adjusting a transmission power at said user station in response to said power adjustment command.
Claim 22
Independent Claim
128 words
A method for power control in a time division multiple access communication system, comprising the steps of: transmitting, over a designated frequency band and in a minor time frame of each one of a series of major time frames, a spread-spectrum user station signal from a user station to a base station, receiving said spread-spectrum user station signal at said base station, transmitting, within a predetermined interval following said spread-spectrum user station signal and over said designated frequency band, a spread-spectrum base station signal from said base station to said user station, said spread-spectrum base station signal comprising a power adjustment command, receiving said spread-spectrum base station signal at said user station, and adjusting a transmission power at said user station in response to said power adjustment command.
Claim 23
Dependent Claim
14 words
The method of claim 17 wherein said predetermined interval is less than 500 microseconds.
Claim 24
Dependent Claim
19 words
The method of claim 17 wherein said predetermined interval is less than a remainder of said minor time frame.
Claim 25
Dependent Claim
38 words
The method of claim 17 further comprising the step of selecting at least one base station antenna from among a plurality of base station antennas in response to receiving said spread-spectrum user station signal at said base station.
Claim 26
Dependent Claim
26 words
The method of claim 20 wherein said selected at least one base station antenna is used for both transmitting to and receiving from said user station.
Claim 27
Dependent Claim
36 words
The method of claim 17 further comprising the step of transmitting, in said minor time frame and over said designated frequency band, a second spread-spectrum user station signal from said user station to said base station.
Claim 28
Dependent Claim
28 words
The method of claim 1 wherein said pulse signal, said first spread spectrum signal, and said second spread spectrum signal are each transmitted over the same frequency band.
Claim 29
Dependent Claim
30 words
The method of claim 8 wherein said control pulse, said spread-spectrum forward link communication message, and said spread-spectrum reverse link communication message are all transmitted over the same frequency band.
Claim 30
Dependent Claim
27 words
The method of claim 8 wherein said predetermined time interval is of a duration short enough to counteract small scale multipath fading effects and propagation shadow effects.
Claim 31
Dependent Claim
15 words
The method of claim 8 wherein said predetermined time interval is less than 500 microseconds.
Claim 32
Dependent Claim
29 words
The method of claim 11 wherein said user station signal, said base-to-user spread spectrum message, and said user-to-base spread spectrum message are all transmitted over said designated frequency band.
Claim 33
Dependent Claim
27 words
The method of claim 11 wherein said predetermined time interval is of a duration short enough to counteract small scale multipath fading effects and propagation shadow effects.
Claim 34
Dependent Claim
15 words
The method of claim 11 wherein said predetermined time interval is less than 500 microseconds.
Claim 35
Dependent Claim
26 words
The method of claim 15 wherein said control pulse, said power adjustment command, and said spread spectrum signal are all transmitted over the same frequency band.
References Cited (Backward Citations)
US4247942A
Cited
US4653069A
Cited
US4222115A
Cited
US4189677A
Cited
US4301530A
Cited
US4291410A
Cited
US4280222A
Cited
US4355411A
Cited
US4324001A
Cited
US4455651A
Cited
US4418393A
Cited
US4418425A
Cited
US4525835A
Cited
US4506372A
Cited
US4432089A
Cited
US4479226A
Cited
US4456793A
Cited
US4484028A
Cited
US4587662A
Cited
US4612637A
Cited
US4680785A
Cited
US4561089A
Cited
US4567588A
Cited
US4601047A
Cited
AU3984485A
Cited
US4658096A
Cited
US4621365A
Cited
EP0189695B1
Cited
US4829554A
Cited
US5005183A
Cited
US4866732A
Cited
US4583048A
Cited
US4675863A
Cited
US5022024B1
Cited
US4817089B1
Cited
US5022024A
Cited
US4912705A
Cited
US4817089A
Cited
US5119375A
Cited
US5121391A
Cited
US4688210A
Cited
US4769812A
Cited
US4630283A
Cited
US4742512A
Cited
US4754453A
Cited
US4868795A
Cited
US4918689A
Cited
EP0219085B1
Cited
US4672658A
Cited
US4724435A
Cited
US4718080A
Cited
US4736371A
Cited
US4696051A
Cited
US4703474A
Cited
US4765753A
Cited
US4745628A
Cited
US4815106A
Cited
US4837786A
Cited
US4807222A
Cited
US4837802A
Cited
US4901307A
Cited
US4804938A
Cited
US4797947A
Cited
US4833702A
Cited
US4893327A
Cited
US4905221A
Cited
US4918690A
Cited
US4878238A
Cited
US5093637A
Cited
US4811357A
Cited
US4979170A
Cited
EP0326104B1
Cited
US5111535A
Cited
US5073899A
Cited
US5483676A
Cited
US4995083A
Cited
US5127042A
Cited
US4984247A
Cited
US5097484A
Cited
US4953197A
Cited
CA2004808C
Cited
US4943973A
Cited
US5022046A
Cited
US5066957A
Cited
US5042050A
Cited
US5200956A
Cited
US5117423A
Cited
US5042082A
Cited
US5008953A
Cited
US5016255A
Cited
US5022047A
Cited
US4972431A
Cited
US5216691A
Cited
US5109390A
Cited
US5267262A
Cited
US5101501A
Cited
US5056109A
Cited
US5265119A
Cited
US5257283A
Cited
US5191597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-14 | 2001-01-13 | 2001-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-14 | 2005-01-13 | 2005-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-14 | 2009-01-13 | 2009-07-15 | $7700.00 | Window Closed / Lapsed |