METHODS AND APPARATUS FOR PARTIAL INTERFERENCE REDUCTION WITHIN WIRELESS NETWORKS
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Abstract
Methods and apparatus that enable one or more wireless networks to minimize inter-cellular interference (ICI) at a receiver. In one embodiment, the network comprises an OFDM-based cellular network, and the method comprises utilizing a priori knowledge of non-data portions of signals from multiple base stations in order to schedule transmissions. In one variant, these non-data portions comprise pilot tones; the pilot tones can be scheduled onto various time-frequency resources of the network so as to minimize ICI. The mobility context of the receiver can also be used as a basis for dynamically adjusting the pilot tone density. In another variant, precoding (e.g., Tomlinson-Harashima precoding) can be applied to “shape” the non-data portions of the transmitted signals so as to mitigate ICI. In yet other variants, frame preambles and learning sequences are used as the basis for invoking selective transmission time shifts across the potentially interfering base stations so as to minimize ICI.
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Citations
54 Claims
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1-34. -34. (canceled)
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35. A mobile device, comprising:
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a processor; a wireless interface in data communication with the processor; and logic in data communication with the processor and the wireless interface, the logic configured to cause the mobile device to; receive data relating to an at least partly corrupted symbol received over the wireless interface; suppress at least one first signal from an interfering source, the at least one first signal having been processed for partial interference reduction; suppress at least one second signal from an interfering source, the at least one second signal not having been processed for partial interference reduction; and decode the received symbol to extract useful data. - View Dependent Claims (36, 37, 38)
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39. A method of scheduling signals within a cellular network to reduce received inter-cell interference at one or more receiving devices, the method comprising:
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providing a schedule for non-data signaling for each one of the plurality of base stations; and modifying a transmission from a first of the plurality of base stations, the modifying being based at least in part on the schedule; wherein the modifying reduces the effects on the transmission of interference caused by the non-data signaling. - View Dependent Claims (40, 41, 42, 43, 44, 46)
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45. The method of claim 45, wherein the regular time interval comprises a transmission time interval for an Orthogonal Frequency-Division Multiplexing (OFDM) system.
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47. A base station apparatus, comprising:
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a processor; at least one network interface in data communication with the processor; logic in data communication with the processor and the at least one network interface, the logic configured to cause the base station apparatus to; identify a schedule for future transmission of a plurality of non-data signals; construct a schedule of data transmissions to be performed by one or more neighboring base stations; and adjust at least the schedule for future transmission of a plurality of non-data signals based at least in part on the constructed schedule; wherein the adjustment is configured to reduce the effect of interference caused by transmission of the plurality of non-data signals. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54)
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Specification