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학술대회 Joint Allocation of Radio and Optical Resources in Virtualized Cloud RAN with CoMP
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Xinbo Wang, Cicek Cavdar, Lin Wang, Massimo Tornatore, Yongli Zhao, 정환석, 이한협, 박수명, Biswanath Mukherjee
Global Communications Conference (GLOBECOM) 2016, pp.1-6
16MH1100, SDN 기반 유무선 액세스 통합 광네트워킹 기술, 정환석
5G Radio Access Networks (RANs) are supposed to increase their capacity by 1000x to handle growing number of connected devices and increasing data rates. The concept of cloud-RAN (CRAN) has been recently proposed to decouple digital units (DUs) and radio units (RUs) of base stations (BSs), and centralize DUs into central offices. CRAN can ease the implementation of advanced radio coordination techniques, e.g., Coordinated Multi-Point (CoMP) Transmission/Reception, to enhance its system throughput. However, separating DUs and RUs, and implementing CoMP in CRAN require low-latency and high-bandwidth connectivity links, called "fronthaul". Today, consensus has not yet been achieved on how BSs, fronthaul, and central offices will be orchestrated to enhance the system throughput. In this study, we present a CRAN over Passive Optical Network (PON) architecture called virtualized-CRAN (V-CRAN). V-CRAN leverages the concept of virtualized PON (VPON) that can dynamically associate any RU to any DU so that several RUs can be coordinated by the same DU, and the concept of virtualized BS (V-BS) that can jointly transmit common signals from multiple RUs to a user. We propose a novel mathematical model based on constraint programming for joint allocation of radio, optical network, and baseband processing resources to enhance RAN throughput, and we solve it by optimally forming VPONs and V-BSs. Comprehensive simulations show that V-CRAN can enhance the system throughput and the efficiency of resource utilization.
KSP 제안 키워드
5G radio access, Cloud-RAN(C-RAN), Coordination Techniques, High bandwidth, Joint allocation, Low latency, Mathematical model, Passive optical network (pon), Radio Access Network, base station(BS), baseband processing