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Actuation Framework for 5G-Enabled Network Slices with QoE/QoS Guarantees
... The motivation of developing this mechanism is obtained from Refs. [9][10][11][12] in which different attempts to provide a unified 5G policy framework in different contexts have been made. However, Refs. ...
... However, Refs. [9][10][11][12] neither have any relation with FLRI-TIs as these are extremely new interleavers and nor have any similarity with the problem addressed and the solution proposed here. ...
Interleaver centric systems have a significant role to play in fifth generation (5G) real-time communication. Flip Left–Right approach based Inverse Tree Interleavers (FLRITIs) are among one of the recently developed interleavers for these interleaver centric systems. During the real-time communication, interleaver assignment requests from multiple users often arrive at next generation NodeB (gNB) simultaneously. Therefore, a mechanism is essentially needed to handle these simultaneous interleaver assignment requests at the gNB. In this paper, an efficient mechanism to handle the simultaneous interleaver i.e. FLRITI assignment requests originated from different wireless transmit receive units is proposed. This mechanism helps the network in taking a correct logical decision based on pre-configured policy/policies while assigning correct sequence number and hence, the correct FLRITI to each 5G user from the inverse tree structure. The method is equally effective in all types of time-critical and non-time critical 5G communication scenarios e.g. Ultra reliable low latency communication 5G new radio, enhanced mobile broadband etc.
... Given the awareness of real-time latency at running services provided by sensors, it is possible to use this data to identify if a particular link/segment is being affected due to possible network congestion or failure, after detecting a rise on the monitored datapath(s) latency levels. To this end, data regarding other monitored parameters (e.g., Bit Error Rate, Throughput, VNF CPU/RAM consumption) would also be used [17]. As introduced in previous sections, the architecture managing the scenario would act upon these types of events and trigger reconfigurations (i.e., actuations) over network elements to guarantee expected service functionality. ...
Network Slicing appears as one of the enabling technologies for 5G networks to accommodate services with different requirements and availability. The present work seizes the use of network slicing and focuses on the deployment and maintenance of services which are sensitive to latency constraints. For this purpose, the design and use of a VNF latency sensor are presented, considering its aggregation to the internal chain of services and the retrieval of latency data from the sensor. In this way, and by making use of such data, the expected service performance can be guaranteed. A multi-level orchestration and control architecture is then introduced to provide all the required functionalities for this mechanism. In order to assess this method experimentally, an emulated multi-segment testbed, considering specific 5G network segments (i.e., Access, Metro and Core), is used. The experimental results demonstrate the correct latency sensing of a particular slice and the process of service maintenance through the triggering of proper network actuations such as path reconfiguration or slice reallocation.
... The framework presented in this work, follows a policy-based approach to perform actuations when required [24]. In particular, an ECA (i.e., event-conditionaction) model is used to define specific behaviours and thresholds to be monitored at the slice, with their corresponding preventing actions. ...
The current deployment of 5G networks in a way to support the highly demanding service types defined for 5G, has brought the need for using new techniques to accommodate legacy networks to such requirements. Network Slicing in turn, enables sharing the same underlying physical infrastructure among services with different requirements, thus providing a level of isolation between them to guarantee their proper functionality. In this work, we analyse from an architectural point of view, the required coordination for the provisioning of 5G services over multiple network segments/domains by means of network slicing, considering as well the use of sensors and actuators to maintain slices performance during its lifetime. We set up an experimental multi-segment testbed to demonstrate end-to-end service provisioning and its guarantee in terms of specific QoS parameters, such as latency, throughput and Virtual Network Function (VNF) CPU/RAM consumption. The results provided, demonstrate the workflow between different network components to coordinate the deployment of slices, besides providing a set of examples for slice maintenance through service monitoring and the use of policy-based actuations.
Network slicing has been taking a major role in upcoming 5G network implementations. However, in order to provision and maintain end-to-end slices, the management and orchestration among different network segments is required. As a result, techniques and components have risen to fulfil these tasks. In this work, we present latency-aware slicing, which is enabled by the provisioning of network slices equipped with an end-to-end latency sensor. This sensor is added to the service chain, allowing for real time monitoring and eventually actuation upon latency requirements violations. Moreover, we introduce an architecture capable of handling the deployment of such sensors while also coordinating the provisioning of the slice across optically interconnected DCs. To experimentally demonstrate the deployment of a slice with latency sensing we set up a multi-segment testbed connecting client VMs. The presented results demonstrate the behavior of the latency sensor and how it enables latency optimization through path reconfiguration.
Communication networks are undergoing their next evolutionary step towards 5G. The 5G networks are envisioned to provide a flexible, scalable, agile and programmable network platform over which different services with varying requirements can be deployed and managed within strict performance bounds. In order to address these challenges a paradigm shift is taking place in the technologies that drive the networks, and thus their architecture. Innovative concepts and techniques are being developed to power the next generation mobile networks. At the heart of this development lie Network Function Virtualization and Software Defined Networking technologies, which are now recognized as being two of the key technology enablers for realizing 5G networks, and which have introduced a major change in the way network services are deployed and operated. For interested readers that are new to the field of SDN and NFV this paper provides an overview of both these technologies with reference to the 5G networks. Most importantly it describes how the two technologies complement each other and how they are expected to drive the networks of near future.