US6850499B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forward power control in a communication system
Assignee: Qualcomm Inc
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Filing: 2001-01-05
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Granted: 2005-02-01
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Expires: 2021-01-05
Abstract
Abstract In a data communication system capable of variable rate transmission, the data rate is determined by the largest C/I measurement of the forward link signals as measured at the Access Terminal. In one embodiment, the data transmission is scheduled based on an Access Terminal initiated forward power control, which reduces forward link rate quantization loss due to excess transmit power. The Access Terminal reports to the Access Point the excess C/I estimate for the selected rate. The Access Point then reduces its transmit power by an appropriate amount when serving that Access Terminal. In another embodiment, the data transmission is scheduled based on an Access Point initiated forward power control. The Access Point varies its transmit power over time either randomly or in synchronism with neighboring Access Points in the communication system, which enables an increase in the throughput achieved by users that receive a significant amount of interference.
Inventors
- 👤 Charles E. Wheatley, III
- 👤 Rashid A. Attar
- 👤 Eduardo A. S. Esteves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:40
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/24; H04W52/26; H04W52/267; H04W52/28; H04W52/286; H04W68/00; H04W72/00; H04W72/50; H04W72/54; H04W72/542
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
78 words
A method for packet data transmission from at least one Access Point to an Access Terminal comprising: paging an Access Terminal of a pending data transmission; selecting an Access Point based on a set of parameters; measuring an excess C/I of forward link signals from the selected Access Point; sending the excess C/I measurement to said selected Access Point; and transmitting data from said selected Access Point at a transmit power in accordance with said excess C/I measurement.
Claim 2
Independent Claim
78 words
A method for packet data transmission from at least one Access Point to an Access Terminal comprising: paging an Access Terminal of a pending data transmission; selecting an Access Point based on a set of parameters; measuring an excess C/I of forward link signals from the selected Access Point; sending the excess C/I measurement to said selected Access Point; and transmitting data from said selected Access Point at a transmit power in accordance with said excess C/I measurement.
Claim 3
Dependent Claim
23 words
The method of claim 1 , wherein said transmitting step is scheduled by a scheduler based on a priority of said Access Terminal.
Claim 4
Dependent Claim
25 words
The method of claim 1 , wherein said measuring, selecting, and sending steps are performed at each time slot until said data transmission is completed.
Claim 5
Dependent Claim
16 words
The method of claim 1 , wherein said transmitting step is performed using a directional beam.
Claim 6
Dependent Claim
18 words
The method of claim 1 , wherein said data is transmitted to said Access Terminal in data packets.
Claim 7
Dependent Claim
22 words
The method of claim 5 further comprising: transmitting a negative acknowledgment (NACK) messages for data packets not received by said Access Terminal.
Claim 8
Dependent Claim
23 words
The method of claim 5 further comprising: retransmitting said data packets not received by said Access Terminal in accordance with said NACK messages.
Claim 9
Dependent Claim
18 words
The method of claim 5 , wherein said data packets are of fixed size for all data rates.
Claim 10
Dependent Claim
18 words
The method of claim 5 , wherein said data packets are transmitted over one or more time slots.
Claim 11
Dependent Claim
13 words
The method of claim 5 , wherein each data packet comprises a preamble.
Claim 12
Dependent Claim
18 words
The method of claim 10 , wherein a length of said preamble is based on said data rate.
Claim 13
Dependent Claim
18 words
The method of claim 1 , wherein the excess C/I measurement is sent in a data request message.
Claim 14
Independent Claim
96 words
A method for packet data transmission from at least one Access Point to an Access Terminal comprising: paging an Access Terminal of a pending data transmission; selecting an Access Point based on a set of parameters; measuring an excess C/I of forward link signals from the selected Access Point; sending a data request message including the excess C/I measurement to said selected Access Point; and transmitting data from said selected Access Point at a data rate in accordance with said data request message and at a transmit power in accordance with said measured excess C/I measurement.
Claim 15
Independent Claim
96 words
A method for packet data transmission from at least one Access Point to an Access Terminal comprising: paging an Access Terminal of a pending data transmission; selecting an Access Point based on a set of parameters; measuring an excess C/I of forward link signals from the selected Access Point; sending a data request message including the excess C/I measurement to said selected Access Point; and transmitting data from said selected Access Point at a data rate in accordance with said data request message and at a transmit power in accordance with said measured excess C/I measurement.
Claim 16
Dependent Claim
76 words
An Access Terminal, comprising: a receiver for receiving paging messages on a forward link signal and performing a C/I measurements and excess C/I measurements on the forward link signal; a controller coupled to said receiver for receiving said paging messages, C/I measurements and excess C/I measurements from the receiver, said controller selecting an Access Point; and a transmitter coupled to said controller for transmitting data request messages including the C/I measurements and the excess C/I measurements.
Claim 17
Dependent Claim
76 words
An Access Terminal, comprising: a receiver for receiving paging messages on a forward link signal and performing a C/I measurements and excess C/I measurements on the forward link signal; a controller coupled to said receiver for receiving said paging messages, C/I measurements and excess C/I measurements from the receiver, said controller selecting an Access Point; and a transmitter coupled to said controller for transmitting data request messages including the C/I measurements and the excess C/I measurements.
Claim 18
Dependent Claim
67 words
An Access Point, comprising: a receiver for receiving C/I measurements and excess C/I measurements; a channel scheduler coupled to said receiver for receiving said C/I measurements and excess C/I measurements from the receiver, said channel scheduler selecting an Access Terminal for data transmission; and a transmitter coupled to said channel scheduler for transmitting data at a transmit power based on the C/I measurements and excess C/I measurements.
Claim 19
Dependent Claim
67 words
An Access Point, comprising: a receiver for receiving C/I measurements and excess C/I measurements; a channel scheduler coupled to said receiver for receiving said C/I measurements and excess C/I measurements from the receiver, said channel scheduler selecting an Access Terminal for data transmission; and a transmitter coupled to said channel scheduler for transmitting data at a transmit power based on the C/I measurements and excess C/I measurements.
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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) | 2008-02-01 | 2008-08-02 | 2009-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-02-01 | 2012-08-02 | 2013-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-02-01 | 2016-08-02 | 2017-02-01 | $7700.00 | Window Closed / Lapsed |