Method and apparatus for estimating reverse link loading in a wireless communication system
First Claim
1. A method of calculating a reverse link loading in an orthogonal frequency division multiple access wireless communication system, the method comprising:
- estimating, at an access point, interference from at least one access terminal not being served by the access point, wherein estimating interference comprises;
detecting a first pilot signal;
detecting a second pilot signal that is contiguous to the first pilot signal in time or frequency; and
subtracting the first pilot signal from the second pilot signal;
measuring a receiver noise in a null time and frequency interval, the null time and frequency interval comprising at least one tone of the orthogonal frequency division multiple access wireless communication system; and
comparing the interference to the receiver noise.
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Abstract
Method and apparatus for estimating reverse link loading in a wireless communication system. The reverse link interference is measured and reverse link receiver noise is measured. The reverse link interference is compared to the reverse link receiver noise, for example, by dividing the interference power by the receiver noise power. The reverse link receiver noise can be measured in an orthogonal frequency division multiple access (OFDMA) system by nulling transmission from access terminals within the cell and nearby during a null time and frequency interval. Power measure in the null time and frequency interval is receiver noise power. The reverse link interference can be measure by several means. For example, local null time and frequency intervals can be designated. The access terminals within the cell null their transmissions during the local time and frequency intervals. Access terminals outside the cell continue to transmit during the local time and frequency intervals. Power measured in the local time and frequency interval is interference power. As another example, interference power can be measured by subtracting pairs of pilot symbols that are contiguous to each other in time or frequency.
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Citations
30 Claims
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1. A method of calculating a reverse link loading in an orthogonal frequency division multiple access wireless communication system, the method comprising:
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estimating, at an access point, interference from at least one access terminal not being served by the access point, wherein estimating interference comprises; detecting a first pilot signal; detecting a second pilot signal that is contiguous to the first pilot signal in time or frequency; and subtracting the first pilot signal from the second pilot signal; measuring a receiver noise in a null time and frequency interval, the null time and frequency interval comprising at least one tone of the orthogonal frequency division multiple access wireless communication system; and comparing the interference to the receiver noise. - View Dependent Claims (2, 3, 4, 5, 6, 14)
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7. A method of calculating a reverse link loading in a wireless communication system, the method comprising:
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estimating, at an access point, interference from at least one access terminal not being served by the access point, wherein estimating interference comprises; detecting a first pilot signal; detecting a second pilot signal that is contiguous to the first pilot signal in time or frequency; and subtracting the first pilot signal from the second pilot signal; measuring a receiver noise in a null time and frequency interval in a guard band; and comparing the interference to the receiver noise.
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8. A wireless communication device operable in an orthogonal frequency division multiple access wireless communication system, the wireless communication device comprising:
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a processor configured to; estimate, at the wireless communication device, interference from at least one access terminal not being served by the wireless communication device, wherein estimating interference comprises; detecting a first pilot signal; detecting a second pilot signal that is contiguous to the first pilot signal in time or frequency; and subtracting the first pilot signal from the second pilot signal; measure a receiver noise in a null time and frequency interval, the null time and frequency interval comprising at least one tone of the orthogonal frequency division multiple access wireless communication system; and compare the interference to the receiver noise; and a transmitter coupled to the processor and configured to transmit wireless communication signals to a plurality of wireless communication access terminals. - View Dependent Claims (9, 10, 11, 12, 13, 15)
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16. A wireless communication device comprising:
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a processor configured to; estimate, at the wireless communication device, interference from at least one access terminal not being served by the wireless communication device, wherein estimating interference comprises; detecting a first pilot signal; detecting a second pilot signal that is contiguous to the first pilot signal in time or frequency; and subtracting the first pilot signal from the second pilot signal; measure a receiver noise in a guard band; and compare the interference to the receiver noise; and a transmitter coupled to the processor and configured to transmit wireless communication signals to a plurality of wireless communication access terminals.
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17. A wireless communication device operable in an orthogonal frequency division multiple access wireless communication system, the wireless communication device comprising:
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a processing means for estimating, at the wireless communication device, interference from at least one access terminal not being served by the wireless communication device, wherein estimating interference comprises; detecting a first pilot signal; detecting a second pilot signal that is contiguous to the first pilot signal in time or frequency; and subtracting the first pilot signal from the second pilot signal; a measuring means for measuring a receiver noise in a null time and frequency interval, the null time and frequency interval comprising at least one tone of the orthogonal frequency division multiple access wireless communication system; a comparing means for comparing the interference to the receiver noise; and a transmitting means for transmitting wireless communication signals to a plurality of wireless communication access terminals, the transmitting means being coupled to the processing means. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A machine-readable medium having stored thereon instructions, which, when executed by a machine, cause the machine to:
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estimate, at an access point, interference from at least one access terminal not being served by the access point, wherein estimating interference comprises detecting a first pilot signal; detecting a second pilot signal that is contiguous to the first pilot signal in time or frequency; and subtracting the first pilot signal from the second pilot signal; measure a receiver noise in a null time and frequency interval, the null time and frequency interval comprising at least one tone of an orthogonal frequency division multiple access wireless communication system; and compare the interference to the receiver noise. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification