Apparatus and method for controlling reverse link interference among access terminals in wireless communications
First Claim
1. A method of directing access terminals that are power controlled by a sector of a base station to change data rates in reverse link communications from the access terminals to the base station, the method comprising:
- determining an effective noise power spectral density (Nt,i,effective) at an access network for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec) of all channels except pilot channels of at least some of the access terminals that are power controlled by the sector, wherein the chip energy of the channels of the access terminal for which the effective noise power spectral density (Nt,i,effective) is determined is not used in determining the effective noise power spectral density (Nt,i,effective);
determining a maximum effective noise power spectral density (Nt,max,effective) among the access terminals; and
determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum effective noise power spectral density.
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Accused Products
Abstract
In a wireless communication system, an apparatus and a method are provided for controlling reverse link interference among access terminals that are power controlled by a sector of a base station. In an embodiment, the maximum effective noise power spectral density is used as a parameter for controlling the level of reverse link loading, by setting a reverse activity bit (RAB) to signal the access terminals to reduce their data rates in order to minimize interference between the access terminals if the maximum effective noise power spectral density is above a predetermined threshold.
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Citations
57 Claims
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1. A method of directing access terminals that are power controlled by a sector of a base station to change data rates in reverse link communications from the access terminals to the base station, the method comprising:
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determining an effective noise power spectral density (Nt,i,effective) at an access network for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec) of all channels except pilot channels of at least some of the access terminals that are power controlled by the sector, wherein the chip energy of the channels of the access terminal for which the effective noise power spectral density (Nt,i,effective) is determined is not used in determining the effective noise power spectral density (Nt,i,effective); determining a maximum effective noise power spectral density (Nt,max,effective) among the access terminals; and determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum effective noise power spectral density. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of directing access terminals that are power controlled by a sector of a base station to change data rates in reverse link communications from the access terminals to the base station, the method comprising:
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determining whether any of the access terminals contributes a significant load to the sector; determining a noise power spectral density (Nt,i) at an access terminal (i), wherein chip energy of the channels of the access terminal (i) is not used in determining the noise power spectral density (Nt,i); determining a maximum noise power spectral density (Nt,max) among the access terminals that contribute a significant, load to the sector; computing a ratio of the maximum noise power spectral density to a thermal noise power spectral density (Nt,max/N0); and determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum noise power spectral density. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A base station apparatus, comprising:
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means for determining an effective noise power spectral density (Nt,i,effective) for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec) of all channels except pilot channels of at least some of the access terminals that are power controlled by a sector of the base station, wherein the chip energy of the channels of the access terminal for which the effective noise power spectral density is determined is not used in determining the effective noise power spectral density; means for determining a maximum effective noise power spectral density (Nt,max,effective) among the access terminals; and means for determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change data rates based upon the maximum effective noise power spectral density. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A base station apparatus, comprising:
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means for determining whether any of a plurality of access terminals contributes a significant load to a given sector of the base station; means for determining a noise power spectral density (Nt,i) at an access terminal (i), wherein chip energy of the channels of the access terminal (i) is not used in determining the noise power spectral density (Nt,i); means for determining a maximum noise power spectral density (Nt,max) among the access terminals that contribute a significant load to the sector; means for computing a ratio of the maximum noise power spectral density to a thermal noise power spectral density (Nt,max/N0); and means for determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change data rates based upon the maximum noise power spectral density. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A computer readable medium containing computer executable instructions embodying a method of directing access terminals that are power controlled by a sector of a base station to change data rates in reverse link communications from the access terminals to the base station, the method comprising:
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determining an effective noise power spectral density (Nt,i,effective) at an access network for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec) of all channels except pilot channels of at least some of the access terminals that are power controlled by the sector, wherein the chip energy of the channels of the access terminal for which the effective noise power spectral density (Nt,i,effective) is determined is not used in determining the effective noise power spectral density (Nt,i,effective); determining a maximum effective noise power spectral density (Nt,max,effective) among the access terminals; and determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum effective noise power spectral density. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
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48. A computer readable medium containing computer executable instructions embodying a method of directing access terminals that are power controlled by a sector of a base station to change data rates in reverse link communications from the access terminals to the base station, the method comprising:
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determining whether any of the access terminals contributes a significant load to the sector; determining a noise power spectral density (Nt,i) at an access terminal (i), wherein chip energy of the channels of the access terminal (i) is not used in determining the noise power spectral density (Nt,i); determining a maximum noise power spectral density (Nt,max) among the access terminals that contribute a significant load to the sector; computing a ratio of the maximum noise power spectral density to a thermal noise power spectral density (Nt,max/N0); and determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum noise power spectral density. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification