Interference cancellation for wireless communications
First Claim
1. A method for processing a power control command for an access terminal in soft handoff, the method comprising:
- receiving power control commands from each base station of a plurality of base stations communicating with the access terminal in soft handoff, wherein each power control command corresponds to a first power control group in a frame of multiple power control groups, and wherein at least one base station of the plurality of base stations transmits a power control command in response to decoding the frame; and
decreasing a transmit power of the access terminal in response to at least one of the power control commands instructing the access terminal to decrease the transmit power.
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Accused Products
Abstract
Techniques for improving the capacity of a wireless communications system using interference cancellation (IC). In an early decoding and IC aspect, a frame transmitted from a user to a base station may be decoded prior to the entire frame being received by the base station. The remaining portion of the frame may then be re-constructed at the base station prior to its reception, and cancelled from the receive signal to reduce the interference to frames received from other users. In a power control aspect for early decoding and IC, the power control target level at a local base station may be adjusted in response to successfully early decoding a frame, without affecting the overall outer loop power control operation. Further aspects include late decoding techniques for utilizing the IC of other users'"'"' signals to improve the probability of decoding a given user'"'"'s frames, as well as techniques for traffic channel demodulation using channel re-estimation.
281 Citations
28 Claims
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1. A method for processing a power control command for an access terminal in soft handoff, the method comprising:
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receiving power control commands from each base station of a plurality of base stations communicating with the access terminal in soft handoff, wherein each power control command corresponds to a first power control group in a frame of multiple power control groups, and wherein at least one base station of the plurality of base stations transmits a power control command in response to decoding the frame; and decreasing a transmit power of the access terminal in response to at least one of the power control commands instructing the access terminal to decrease the transmit power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for processing a power control command for an access terminal in soft handoff, the apparatus comprising:
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a receiver configured to receive power control commands from each base station of a plurality of base stations communicating with the access terminal in soft handoff, wherein each power control command corresponds to a first power control group in a frame of multiple power control groups, and wherein at least one base station of the plurality of base stations transmits a power control command in response to decoding the frame; and a power control module configured to decrease a transmit power of the access terminal in response to at least one of the power control commands instructing the access terminal to decrease the transmit power. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus for processing a power control command for an access terminal in soft handoff, the apparatus comprising:
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means for receiving power control commands from each base station of a plurality of base stations communicating with the access terminal in soft handoff, wherein each power control command corresponds to a first power control group in a frame of multiple power control groups, and wherein at least one base station of the plurality of base stations transmits a power control command in response to decoding the frame; and means for decreasing a transmit power of the access terminal in response to at least one of the power control commands instructing the access terminal to decrease the transmit power. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A non-transitory computer readable medium for processing a power control command for an access terminal in soft handoff, the non-transitory computer readable medium comprising operational instructions that, when executed by a processor, cause the processor to perform operations including:
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receiving power control commands from each base station of a plurality of base stations communicating with the access terminal in soft handoff, wherein each power control command corresponds to a first power control group in a frame of multiple power control groups, and wherein at least one base station of the plurality of base stations transmits a power control command in response to decoding the frame; and decreasing a transmit power of the access terminal in response to at least one of the power control commands instructing the access terminal to decrease the transmit power. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification