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Methods and apparatus for partial interference reduction within wireless networks

專利號
US10785783B2
公開日期
2020-09-22
申請人
APPLE INC.（US CA Cupertino）
發(fā)明人
Markus Mueck; Maik Bienas; Andreas Schmidt
IPC分類
H04K1/10; H04L27/28; H04W72/12; H04J11/00; H04L5/00; H04L25/497; H04B15/00; H04W72/08
技術(shù)領(lǐng)域
bs,ue,pilot,tones,in,data,cir,or,be,frequency
地域： CA CA Cupertino

摘要

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.

說明書

At step 940, the index n is again set to n=1, and the UE estimates the strongest interfering signal having not previously been interference-cancelled at the BS. At step 942, the interfering signal is reconstructed and subtracted from the signal composition. After all such interferers have been removed, the remaining signal is processed (decoded) by the UE at step 944.

Exemplary Receiver Apparatus—

FIG. 10A illustrates an exemplary client or receiver apparatus 1000 useful in implementing the methods of the present invention. The receiver apparatus disclosed may comprise, inter alia, a UE such as a cellular telephone, PDA, portable computer or other mobile communications device capable of operating within, for example, an OFDMA network.

The UE apparatus 1000 comprises an application processor subsystem 1012 such as a digital signal processor, microprocessor, field-programmable gate array, or plurality of processing components mounted on one or more substrates 1018. The processing subsystem may also comprise an internal cache memory 1012A. The processing subsystem 1012 is connected to a memory subsystem comprising memory 1014 which may for example, comprise SRAM, FLASH and SDRAM components. The memory subsystem may implement one or a more of DMA type hardware 1014A, so as to facilitate data accesses as is well known in the processor arts.

權(quán)利要求

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