Research Article
CPRI compression transport for LTE and LTE-A signal in C-RAN
@INPROCEEDINGS{10.1109/ChinaCom.2012.6417602, author={Bin Guo and Wei Cao and An Tao and Bijun Zhang}, title={CPRI compression transport for LTE and LTE-A signal in C-RAN}, proceedings={First International Workshop on C-RAN}, publisher={IEEE}, proceedings_a={C-RAN}, year={2013}, month={2}, keywords={cpri compression lte c-ran}, doi={10.1109/ChinaCom.2012.6417602} }- Bin Guo
Wei Cao
An Tao
Bijun Zhang
Year: 2013
CPRI compression transport for LTE and LTE-A signal in C-RAN
C-RAN
IEEE
DOI: 10.1109/ChinaCom.2012.6417602
Abstract
C-RAN is the next-generation clean wireless access network architecture, which is based on centralized processing, the Collaborative Radio and Real-time Cloud Infrastructure. LTE (Long Term Evolution) and LTE-A, which are based on OFDM and MIMO technologies, are regarded as the main wireless access technology in the evolution from 3G to 4G. LTE introduces variety of novel technologies to improve the system performance, especially in C-RAN architecture, such as Multi antennas MIMO, Carrier Aggregation, CoMP. However, C-RAN sets much higher demand on transport network resource. In this paper a low-latency baseband signal compression algorithm is proposed. Based on the characteristics of LTE signal, the algorithm consists of 3 steps: 1. Removal of redundancies in frequency domain; 2. Block scaling; 3. non-linear (non-uniform) quantization. This algorithm can effectively reduce the amount of data transferred between BBU and RUU in LTE system, to facilitate the deployment of LTE in the C-RAN architecture. Simulation results show that the compression algorithm works well with 1/2 compression rate.