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Methods and apparatus for partial interference reduction within wireless networks

專利號(hào)
US10785783B2
公開日期
2020-09-22
申請(qǐng)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

Referring now to FIG. 10B, one embodiment of a serving base station apparatus 1050 useful in implementing the methods of the present invention is illustrated. It will be appreciated that the base station apparatus of the invention may take the form of or be integrated with or within literally any type of wireless transmitter, such as e.g., a cellular macrocell (i.e., fully capable fixed cellular network base station), or a fixed or portable femtocell or other such less capable device (assuming adequate intra-cell communication channels exist).

In the illustrated embodiment, the base station apparatus 1050 comprises one or more substrate(s) 1068 (e.g., a plug-in card or the like) that further include a plurality of integrated circuits including a processing subsystem 1062 such as a digital signal processor (DSP), microprocessor, gate array, or plurality of processing components as well as a power management subsystem 1066 that provides power to the base station 1050.

The embodiment of the apparatus 1050 shown in FIG. 10B at a high level comprises a broadcasting circuit configured to broadcast within, for example, an OFDMA network, and which can switch between partial interference cancellation modes and non-interference cancelling modes if desired. The broadcasting subsystem comprises a digital baseband 1058, analog baseband 1056, and RF components for RX 1052 and TX 1054.

The processing subsystem 1062 may comprise a plurality of processors (or multi-core processor(s)). Additionally, the processing subsystem also may include a cache memory 1062A to facilitate processing operations.

權(quán)利要求

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