Survivable BBU Placement for C-RAN over Optical Aggregation Networks

Abstract

Centralized Radio Access Network (C-RAN) is a novel mobile network architecture, designed to effectively support the challenging requirements of future 5G mobile networks. Unlike Distributed RAN (D-RAN), in C-RAN, baseband units (BBUs) are located in a single physical location, called "BBU pool", connected to several Remote Radio Heads (RRHs) via the so-called "fronthaul" network. Following this centralization, designing a survivable C-RAN becomes crucial as BBU pool failures might cause service outage for large number of users. In this paper, we introduce the survivable BBU pool placement problem for C-RAN deployment over an optical aggregation network and formalize it by Integer Linear Programming (ILP). The ILP objective is to minimize the number of BBU pools, the number of used wavelengths and the computational resources. The results compare the aforementioned objectives and show the effect of the latency and of the transport-network capacity on the optimal solution.

Network Coding Enabling Resilient 5G Networks

“…and are binary coefficients taking values equal to 1 if link belongs to path and ′, respectively, realizing FH flow at server or ′; 0 otherwise. In (4), is an upper bound of the capacity of link . Apart from server failures, optical network link failures are also addressed by forwarding FH flows to their destination via alternative paths.…”

Resilient BBU placement in 5G C-RAN over optical aggregation networks

“…In [1] we present a survivable BBU placement algorithm where every RRH must be connected to two different BBU pools, one as a working (primary) pool and the second one as a backup pool and link protection is not considered. We formulate and solve the survivable BBU placement problem over an optical aggregation network using an Integer Linear Program (ILP).…”

“…As an extension of our work in [1], in this paper, we investigate the survivable BBU placement problem and traffic routing for 5G C-RAN deployment. We propose three protection approaches: i) Dedicated Path Protection (DPP) ii) Dedicated BBU Protection (DBP) and iii) Dedicated BBU and Path Protection (DBPP).…”