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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

Alternatively, other prior art techniques may compensate to some degree for certain forms of interference to enable limited suppression of corruption, and suffer from the disability of inter alia that channel characteristics are often imperfectly known. Recall that transmission corruption is introduced by unwanted channel noise, of which some causes are random (e.g. thermal noise, weather induced fading, etc) and others are predictable (such as ICI, and self-induced interference). One characterization of the effects of channel corruption is termed Channel Impulse Response (CIR). A CIR represents the effects on an “imaginary” impulse transmitted from one or more transmitters in a “vacuum”, and their corresponding measured incident response at the receiver antenna. FIG. 2B illustrates an imaginary BS 202, which is the superposition of three (3) “real” 135 202A, 202B, and 202C. Each BS (202A, 202B, 202C) has a corresponding CIR at the UE. However, the aggregate CIR 208 is actually perceived at UE 206, as the UE cannot distinguish which CIR belongs to which of the “real” base stations.

權(quán)利要求

1
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