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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
技術領域
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

However, if the delay is larger than the GI, the interfering symbol would be a mixture of two “partial” OFDM symbols; i.e. something similar to “r=FFT(v+w)=FFT(v)+FFT([wr(n, n+1, . . . , N?1) w2(0, 1, . . . n?1)])”. Then, the expression “FFT([w1(n, n+1+1, . . . , N?1) w2(0, 1, . . . n?1)])” produces an “uncontrolled interference” of all carriers of “w1” and “w2” onto each of the carries of “v”. This increases the interference reduction complexity considerably.

Hence, it is preferred that aligned overlapping OFDM symbols are utilized to reduce overhead/processing complexity; however, non-aligned symbols can be handled (yet with increased complexity).

Notwithstanding, however, it will be recognized that the order of the LS and preamble can feasibly be permuted within the illustrated data structure (frame); i.e., preamble after the LS. (i.e., the invention is not limited to the structure shown in FIGS. 8A and 8B with respect to the order of the preamble/LS).

Moreover, the LS can be placed after the data portion within the frame if desired. For example, certain standards/protocols utilize a small LS in the middle of the frame (so-called “mid-ambles”).

It will also be appreciated that a complete shift of the LS and preamble (i.e., so that the preamble boundary of the useful data signal is aligned with the data portion 408 boundary of the interfering signal as shown in FIG. 8) is not always mandatory; a partial shift (i.e., so that the beginning boundary of the LS 404 of the useful signal is aligned with the initial data portion 408 boundary of the interfering signal) may be used, although this will result in less interference reduction.

權利要求

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