CA2477279A1 - Channel quality feedback for power control in a cdma system - Google Patents

Channel quality feedback for power control in a cdma system Download PDF

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Publication number
CA2477279A1
CA2477279A1 CA002477279A CA2477279A CA2477279A1 CA 2477279 A1 CA2477279 A1 CA 2477279A1 CA 002477279 A CA002477279 A CA 002477279A CA 2477279 A CA2477279 A CA 2477279A CA 2477279 A1 CA2477279 A1 CA 2477279A1
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Canada
Prior art keywords
quality
frequency
messages
channel condition
link
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Granted
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CA002477279A
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French (fr)
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CA2477279C (en
Inventor
Edward G. Tiedemann, Jr.
Stein A. Lundby
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Qualcomm Inc
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Individual
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Publication of CA2477279A1 publication Critical patent/CA2477279A1/en
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Publication of CA2477279C publication Critical patent/CA2477279C/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal

Abstract

Method and apparatus for providing link quality feedback to a transmitter (3 2, 34). In one embodiment, a periodic link quality message is transmitted on a gated channel, while continuous differential indicators are transmitted. Between quality messages, the differential indicators track the quality of t he link. In one embodiment, a parity check is provided with the quality message . In another embodiment, the frequency of transmission for the quality message s is determined by the channel quality. When the receiver anticipates receptio n of a transmission, the quality messages are generated; else the quality messages are halted.

Claims (19)

1. A remote station apparatus comprising:
a quality measurement unit for iteratively measuring link quality of a communication link;
a quality message processing unit for generating a quality message based on the measured link quality and for generating a parity check corresponding to the quality message; and a differential analyzer for determining changes in the measured link quality.
2. The remote station of claim 1, wherein the link quality is measured as carrier to interference of a received signal.
3. The remote station of claim 2, wherein the quality measurement unit generates a quality metric, and wherein the remote station applies a sector cover to the quality metric.
4. In a wireless communication system, a method comprising:
generating quality messages at a first frequency, the quality messages providing information on the quality of a communication link; and generating a parity check for each of the quality messages.
5. The method of claim 5, further comprising:
generating differential indicators at a second frequency, the differential indicators indicating changes in the quality of the communication link, wherein the second frequency is greater than the first frequency.
6. The method of claim 5, wherein each quality message includes carrier to interference information of a received signal at a receiver.
7. The method of claim 4, wherein each differential indicator is at least one bit.
8. In a wireless communication system, a method comprising:
estimating a channel condition over a first time window;
comparing the estimated channel condition to a first threshold value;
determining a transmission rate for transmission of quality messages based on the comparison; and transmitting quality messages at the transmission rate.
9. The method as in claim 8, wherein the first time window is dynamically adjusted based on operation of the system.
10. The method as in claim 8, further comprising:
calculating an average channel condition; and calculating variance of the channel condition.
11. A wireless apparatus, comprising:
means for estimating a channel condition over a first time window;
means for comparing the estimated channel condition to a first threshold value;
means for determining a transmission rate for transmission of quality messages based on the comparison; and means for transmitting quality messages at the transmission rate.
12. In a wireless communication system for processing voice communications and packet-switched communications, a base station comprising:
receive circuitry operative to receive signals on a reverse link, including a quality message with a parity check, and differential indicators, the quality message periodically providing a quality metric of a forward link, wherein the differential indicators track the quality metric between successive quality messages;
a memory storage unit operative to store a quality message received on the reverse link; and a differential analyzer to update the quality message stored in the memory storage unit in response to the differential indicators and the parity check.
13. A wireless apparatus, comprising:
processing unit, operative for executing computer-readable instructions; and a memory storage unit adapted to store a plurality of computer-readable instructions for:
generating quality messages at a first frequency, the quality messages providing information on the quality of a communication link; and generating a parity check for each of the quality messages.
14. The apparatus of claim 13, wherein the plurality of computer-readable instructions are further adapted for:
generating differential indicators at a second frequency, the differential indicators indicating changes in the quality of the communication link, wherein the second frequency is greater than the first frequency.
15. A wireless apparatus, comprising:
processing unit, operative for executing computer-readable instructions; and a memory storage unit adapted to store a plurality of computer-readable instructions for:
estimating a channel condition over a first time window;
comparing the estimated channel condition to a first threshold value;
determining a transmission rate for transmission of quality messages based on the comparison; and transmitting quality messages at the transmission rate.
16. In a wireless communication system, the wireless communication system supporting a plurality of carriers, a method comprising:
determining an average channel condition among the plurality of carriers;
comparing the average channel condition to a first threshold value;
determining a transmission rate for transmission of quality messages based on the comparison; and transmitting quality messages at the transmission rate.
17. The method as in claim 16, further comprising:
assigning a weight to each of the plurality of carriers, wherein the average channel condition is a weighted average.
18. A wireless apparatus, comprising:
processing unit, operative for executing computer-readable instructions; and a memory storage unit adapted to store a plurality of computer-readable instructions for:
determining a best channel condition associated with a first frequency; and generating a quality message, the quality message including a quality indicator and a frequency indicator, the frequency indicator identifying the first frequency.
19. The wireless apparatus as in claim 18, wherein the frequency indicator is a pointer to select the first frequency from a plurality of predetermined frequencies.
CA2477279A 2002-02-25 2003-02-19 Channel quality feedback for power control in a cdma system Expired - Fee Related CA2477279C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/084,019 US7986672B2 (en) 2002-02-25 2002-02-25 Method and apparatus for channel quality feedback in a wireless communication
US10/084,019 2002-02-25
PCT/US2003/005364 WO2003073644A1 (en) 2002-02-25 2003-02-19 Channel quality feedback for power control in a cdma system

Publications (2)

Publication Number Publication Date
CA2477279A1 true CA2477279A1 (en) 2003-09-04
CA2477279C CA2477279C (en) 2012-10-30

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CA2477279A Expired - Fee Related CA2477279C (en) 2002-02-25 2003-02-19 Channel quality feedback for power control in a cdma system

Country Status (13)

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US (2) US7986672B2 (en)
EP (3) EP2200381B1 (en)
JP (3) JP4597530B2 (en)
KR (1) KR100985258B1 (en)
CN (1) CN100407588C (en)
AT (1) ATE354888T1 (en)
AU (1) AU2003213213A1 (en)
BR (1) BR0307930A (en)
CA (1) CA2477279C (en)
DE (1) DE60311966T2 (en)
MX (1) MXPA04008247A (en)
TW (1) TWI270264B (en)
WO (1) WO2003073644A1 (en)

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