242 research outputs found
Joint Energy Efficient and QoS-aware Path Allocation and VNF Placement for Service Function Chaining
Service Function Chaining (SFC) allows the forwarding of a traffic flow along
a chain of Virtual Network Functions (VNFs, e.g., IDS, firewall, and NAT).
Software Defined Networking (SDN) solutions can be used to support SFC reducing
the management complexity and the operational costs. One of the most critical
issues for the service and network providers is the reduction of energy
consumption, which should be achieved without impact to the quality of
services. In this paper, we propose a novel resource (re)allocation
architecture which enables energy-aware SFC for SDN-based networks. To this
end, we model the problems of VNF placement, allocation of VNFs to flows, and
flow routing as optimization problems. Thereafter, heuristic algorithms are
proposed for the different optimization problems, in order find near-optimal
solutions in acceptable times. The performance of the proposed algorithms are
numerically evaluated over a real-world topology and various network traffic
patterns. The results confirm that the proposed heuristic algorithms provide
near optimal solutions while their execution time is applicable for real-life
networks.Comment: Extended version of submitted paper - v7 - July 201
Probabilistic QoS-aware Placement of VNF chains at the Edge
Deploying IoT-enabled Virtual Network Function (VNF) chains to Cloud-Edge
infrastructures requires determining a placement for each VNF that satisfies
all set deployment requirements as well as a software-defined routing of
traffic flows between consecutive functions that meets all set communication
requirements. In this article, we present a declarative solution, EdgeUsher, to
the problem of how to best place VNF chains to Cloud-Edge infrastructures.
EdgeUsher can determine all eligible placements for a set of VNF chains to a
Cloud-Edge infrastructure so to satisfy all of their hardware, IoT, security,
bandwidth, and latency requirements. It exploits probability distributions to
model the dynamic variations in the available Cloud-Edge infrastructure, and to
assess output eligible placements against those variations
Flexible connectivity and QoE/QoS management for 5G networks: the 5G NORMA view
Proceeding of: 2016 IEEE International Conference on Communications Workshops (ICC)The goal envisioned by 5G NORMA is to develop a novel, adaptive and future-proof 5G mobile network architecture. In order to fulfill these requirements, 5G NORMA envisions an extremely flexible architecture to be deployed in a multi-tier distributed data-center. In this paper we focus on the novel mobility management schemes, QoE/QoS, Control and Orchestration mechanisms that are being developed in 5G NORMA. These modules, that follow the software-defined principle, jointly optimize core and access functions. The final result is a modular architecture that adapts to the requirements of very heterogeneous services, while allowing multiple tenants to share network resources among them, providing hence the flexible connectivity needed by future 5G Networks.This work has been performed in the framework of the H2020-ICT-2014-2 project 5G NORMA
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