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Methods and apparatus for partial interference reduction within wireless networks

專(zhuān)利號(hào)
US10785783B2
公開(kāi)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(lèi)
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(shuō)明書(shū)

1) Legacy UE—The legacy UE inherently assumes that the SINR is constant over the whole frame (it is not aware that partial interference suppression is applied). The interference suppression will thus not achieve its full potential, since the SINR estimates used in the Maximum Likelihood (or similar) detection/decoding algorithm are not correct over the carriers where interference reduction is applied. Nonetheless, the performance gain under such circumstances is significant as compared to the case without interference reduction applied.

2) Non-legacy UE—The non-legacy UE adapted for interference reduction according to the invention knows where interference reduction is applied, and will use the optimum SINR values for each carrier/OFDM symbol for the Maximum Likelihood (or similar) decoder. Then, the maximum performance of the scheme is achieved.

The Analog Baseband 1006 controls operation of the radio frontends and converts a digital signal (input from the digital baseband modem 1008) to an analog representation for transmission. Therefore, the digital baseband modern loads the analog baseband, with scheduling parameters for the upcoming frame. The control of TX and RX frontends are also controlled by the analog baseband 1006.

The illustrated power management subsystem (PMS) 1016 provides power to the UE, and may comprise an integrated circuit and or a plurality of discrete electrical components. In one exemplary portable UE apparatus, the power management subsystem interfaces with a battery.

Exemplary Serving Base Station Apparatus—

權(quán)利要求

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