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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

The system for pilot tone scheduling previously described herein can be further improved with precoding compensation methods. As the BS 202 sending a signal to a given target UE 206 knows the transmit time and position of pilot signals that are going to be sent by other base stations, some of these pilot signals will interfere with the useful data to be decoded by the target UE. In order to keep the latency as low as possible, and minimally reduce the load on the links connecting adjoining base stations, a BS of the exemplary embodiment has no information about the user data to be sent in the future by other BSs. However, as pilot tones are easily represented and scheduled, they may be compensated to improve spectral efficiency.

As previously discussed, the BSs 202 may collaborate on scheduling pilot tones, CIRs 208 of all radio channels from each BS to each UE 206, and timing synchronization. All these elements may be achieved using a suitable communication between the BS access networks.

權(quán)利要求

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