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학술지 Handover Reduction in Virtualized Cloud Radio Access Networks Using TWDM-PON Fronthaul
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저자
Xinbo Wang, Lin Wang, Cicek Cavdar, Massimo Tornatore, Gustavo B. Figueiredo, 정환석, 이한협, 박수명, Biswanath Mukherjee
발행일
201612
출처
IEEE/OSA Journal of Optical Communications and Networking, v.8 no.12, pp.B124-B134
ISSN
1943-0620
출판사
IEEE, OSA
DOI
https://dx.doi.org/10.1364/JOCN.8.00B124
협약과제
16MH1100, SDN 기반 유무선 액세스 통합 광네트워킹 기술, 정환석
초록
To meet challenging 5G capacity requirements, operators are densifying their cellular networks by deploying additional small cells to cover hot spots, and such an increase in the number and density of cells may result in excessive numbers of handovers. In this study, we propose a handover reduction mechanism implemented in a cloud radio access network (CRAN) by exploiting the high capacity of an optical access network serving as a "fronthaul." CRAN has been proposed as a 5G radio access network architecture, where the digital unit (DU) of a conventional base station (BS) is separated from the radio unit (RU) and moved to the "cloud" (DU-cloud) for better mobility management and cost saving. Separating RUs and DUs requires a low-latency and high-bandwidth 5G transport network to handle "fronthaul" traffic, for which optical access is an excellent choice. Here, we present a new 5G architecture, called virtualized-CRAN (V-CRAN), moving toward a cell-less 5G mobile network architecture. We leverage the concept of a "virtualized-BS" (V-BS) that can be formed by exploiting several enabling technologies such as software-defined radio and coordinated multipoint transmission/reception. A V-BS can be formed on a per-user basis by allocating virtualized resources on demand so that common signals can be jointly transmitted from multiple RUs to the user without triggering handover. We first model the handover reduction optimization problem for a scenario where future mobility information is known, and then propose a suite of algorithms for a scenario where future information is unknown. Simulation results show that V-CRAN can enhance the throughput of users at the cell-edge, as well as significantly reduce the number of handovers, handover delay, and failure rate.
KSP 제안 키워드
5G architecture, 5G mobile network, 5G radio access network, 5G transport, Cell-Edge, Cellular networks, Cloud radio, Cloud-RAN(C-RAN), Cost savings, Enabling technologies, Failure Rate