Abstract
AbstractHigh throughput, resilience, and low latency requirements drive the development of 5G‐enabled content delivery networks (CDNs) which combine core data centers (cDCs) with edge data centers (eDCs) that cache the most popular content closer to the end users for traffic load and latency reduction. Deployed over the existing optical network infrastructure, CDNs are vulnerable to link cut attacks aimed at disrupting the overlay services. Planning a CDN to balance the stringent service requirements and increase resilience to attacks in a cost‐efficient way entails solving the content placement problem (CPP) across the cDCs and eDCs. This article proposes a framework for finding Pareto‐optimal solutions with minimal user‐to‐content distance and maximal robustness to targeted link cuts, under a defined budget. We formulate two optimization problems as integer linear programming (ILP) models. The first, denoted as K‐best CPP with minimal distance (K‐CPP‐minD), identifies the eDC/cDC placement solutions with minimal user‐to‐content distance. The second performs critical link set detection to evaluate the resilience of the K‐CPP‐minD solutions to targeted fiber cuts. Extensive simulations verify that the eDC/cDC selection obtained by our models improves network resilience to link cut attacks without adversely affecting the user‐to‐content distances or the core network traffic mitigation benefits.
Highlights
Emerging applications have been pushing the limits of throughput and latency that current network deployments can offer
We extend our previous work by considering 5G-enabled content delivery networks (CDNs), where core data centers (cDCs) and edge data centers (eDCs) can be simultaneously used to provide lower latency and improve robustness
The results presented were obtained by a custom-built Java-based tool, which writes the optimization programming language (OPL) and data files respective to the problem, and solves the problem by calling the CPLEX 12.6.3 library
Summary
Emerging applications have been pushing the limits of throughput and latency that current network deployments can offer. 4K and/or 360◦ video streaming, augmented and virtual reality (AR/VR), or remote machinery control applications require high throughput, low latency, and high reliability to provide satisfying user experience. The original CDN architecture cannot offer as low latency levels as some of the emerging applications require. To support these stringent requirements in a scalable manner, the fifth generation of networks (5G) networking paradigm introduces small DCs at the network edge, where the most popular content is cached closer to the end users [24, 30].
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