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Modified architecture for cloud radio access networks and approach for compression of front-haul data

專利號
US10064242B2
公開日期
2018-08-28
申請人
INTEL IP CORPORATION(US CA Santa Clara)
發(fā)明人
Sameer Pawar; Huaning Niu; Apostolos Papathanassiou
IPC分類
H04W88/08; H03M7/40; H04W92/12
技術領域
errh,module,bbu,haul,can,rrh,in,framing,pusch,signal
地域: CA CA Santa Clara

摘要

Systems and methods disclosed herein describe a centralized-processing cloud-based RAN (C-RAN or cloud-RAN) architecture that offers reduced front-haul data-rate requirements compared to common-public-radio-interface (CPRI) based C-RAN architectures. Base-band physical-layer processing can be divided between a BBU Pool and an enhanced RRH (eRRH). A frequency-domain compression approach that exploits LTE signal redundancy and user scheduling information can be used at the eRRH to significantly reduce front-haul data-rate requirements. Uniform scalar quantization and variable-rate Huffman coding in the frequency-domain can be applied in a compression approach based on the user scheduling information wherein a lossy compression is followed by a lossless compression.

說明書

As in 570, a lossy compression can be performed at the UE. In some examples, the lossy compression can be performed by a compression module at the eRRH. As part of the lossy compression (or as a preliminary pre-processing action), each PUSCH I/Q sample in a plurality of PUSCH I/Q samples (e.g., frequency-domain I/Q samples produced by performing an FFT on time-domain I/Q samples corresponding to the PUSCH I/Q symbols) corresponding to the plurality of PUSCH I/Q symbols can be normalized. In some examples, each PUSCH I/Q can be normalized to a value ranging from ?1 to 1 by subtracting a mean value and using a scaling value. The normalized PUSCH I/Q samples can then be quantized based on the number of bits. In some examples, uniform scalar quantization can be applied to each normalized PUSCH I/Q sample (e.g., by a uniform scalar quantizer).

As in 580, a lossless compression can be performed at the UE. In some examples, the lossless compression can be performed by the compression module at the eRRH. In the lossless compression, a prefix-free code can be applied to a plurality of bit subsets, each bit subset in the plurality of bit subsets being associated with a respective PUSCH I/Q sample in the plurality of PUSCH I/Q samples. In some examples, each bit subset in the plurality of bit subsets can comprise the two most significant bits (MSBs) of the PUSCH I/Q sample with which the bit subset is associated. In some examples, the prefix-free code can be a Huffman code in which a value of 00 for the MSBs maps to a single coded bit having a value of 0; a value of 01 for the MSBs maps to two coded bits having a value of 10; a value of 10 for the MSBs maps to three coded bits having a value of 110; and a value of 11 for the MSBs maps to four coded bits having a value of 111.

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