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http://dx.doi.org/10.17662/ksdim.2022.18.1.011

Implementation of an O-RAN-Compliant Base Station System Using Commercial Off-the-Shelf Components  

Du, Hongxin (한양대학교 전자컴퓨터통신공학과)
Zhang, Zhongfeng (한양대학교 전자컴퓨터통신공학과)
Choi, Seungwon (한양대학교 전자컴퓨터통신공학과)
Lee, Taehoon ((주)삼지전자 통신사업본부)
Publication Information
Journal of Korea Society of Digital Industry and Information Management / v.18, no.1, 2022 , pp. 11-24 More about this Journal
Abstract
Open Radio Access Network (O-RAN) standard has been proposed to separate the baseband signal processing unit from the Radio Frequency (RF) unit at base station system mainly for reducing the cost of base station systems through open-source interfaces between the two units. To satisfy the performance metrics in various scenarios, several fronthaul functional split options were presented by O-RAN. Amongst these options, the split option 7-2x is widely adopted in practical applications due to its excellent trade-off between the required bandwidth and RU overhead. In this paper, we present a hardware implementation of a base station system that is compliant with the Category B of O-RAN split option 7-2x. It consists of O-DU and O-RU implemented with a commercial off-the-shelf Digital Signal Processor and RF transceiver, respectively. The performance of the proposed base station system is evaluated in terms of Bit Error Rate and received signal power as well as the required fronthaul bandwidth. Through various experimental tests, we have observed that the proposed system reduces the fronthaul bandwidth nearly by 89.7% compared to the conventional system that dose not employ the O-RAN standard.
Keywords
O-RAN; Category B; Split Option 7-2x; DSP; USRP;
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