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With the advent of 5G networks, more dynamicity and flexibility will be needed for the deployment of services with very distinct requirements. Crosshaul areas (those integrating fronthaul and backhaul) are especially critical because of the variability of the demand and the cost of the (own) network deployment, which in many cases is jeopardized by the huge level of investment needed. A common market...
To address scalability concerns, hierarchical control plane organization has been proposed for SDN. However, an open question is how such a hierarchy should look like. In this paper, we model the impact of hierarchies on control plane performance and derive an expression for an optimal hierarchical organization for a given network scale. We then show that using a 4-layer SDN is sufficient for practical...
One of the main goals of future telecom networks is to achieve softwarization of network functions. A requirement to achieve this softwarization is the ability to construct on-demand networks across multi-domain network and/or cloud service providers (NCSP). Most current algorithms and MILP formulations that solve the multi-domain embedding problem work on a flat infrastructure using simplified physical...
In recent years there has been a considerable research surrounding multi-provider cloud platforms. Various architectures for realizing such systems have been proposed. However, most of this research has overlooked (or mentioned in passing) a vital aspect for the multi-provider deployment of platforms: the design of a monitoring systems to co-ordinate the monitoring systems in those platforms. This...
High performance systems require high levels of reliability. Many functions involved in telecommunication and IT networks have reliability requirements that can only be achieved by introducing redundant resources. In the telecom sector, recently, there has been a significant effort on moving carrier grade systems and functions to virtualized network infrastructure. The management and coordination...
Virtual network embedding is considered an important problem to solve in order to make infrastructure virtual-ization economically reasonable. The most efficient algorithms proposed so far define link and node mappings as optimal solutions of Integer Programming (IP) problems. They exhibit reasonably good performance only for small problem instance sizes, including few tens of nodes and links per...
Software defined networking (SDN) has emerged as an efficient network technology for lowering operating costs through simplified hardware, software and management. Specific research focus has been placed to achieve a successful carrier grade network with SDN, in terms of scalability, reliability, QoS and service management. In the literature, very little material is currently available on traffic...
Coverage extension and quality, cell power utilization, neighbor cells ranking and other information normally provided by expensive field measurement campaigns can alternatively be extracted from signaling monitored in the Radio Network Controller. This paper, after reviewing a set of key performance metrics and optimization solutions validated experimentally in live networks, shows how automation...
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