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학술지 Energy-Efficient Joint Design of Fronthaul and Edge Links for Cache-Aided C-RAN Systems with Wireless Fronthaul
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저자
김준범, 유대성, 홍승은, 박석환
발행일
201909
출처
Entropy, v.21 no.9, pp.1-23
ISSN
1099-4300
출판사
MDPI
DOI
https://dx.doi.org/10.3390/e21090860
협약과제
19HH5100, 고밀집 네트워크(UDN) 환경에서 고용량, 저비용 달성을 위한 무선전송 기술 개발, 노태균
초록
This work addresses the joint design of fronthaul and edge links for a cache-aided cloud radio access network (C-RAN) system with a wireless fronthaul link. Motivated by the fact that existing techniques, such as C-RAN and edge caching, come at the cost of increased energy consumption, an energy efficiency (EE) metric is defined and adopted as the performance metric for optimization. As the fronthaul links can be used to transfer quantized and precoded baseband signals or hard information of uncached files, both soft- and hard-transfer fronthauling strategies are considered. Extensive numerical results validate the impact of edge caching, as well as the advantages of the energy-efficient design over the spectrally-efficient scheme. Additionally, the two fronthauling strategies-the soft- and hard-transfer schemes-are compared in terms of EE.
KSP 제안 키워드
Cloud radio, Cloud-RAN(C-RAN), Edge caching, Energy Efficiency, Energy-efficient design, Joint design, Numerical results, Radio Access Network, Wireless fronthaul, baseband signal, energy consumption
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