On Service Resilience in Cloud-Native 5G Mobile Systems

Abstract

International audienceTo cope with the tremendous growth in mobile data traffic on one hand, and the modest average revenue peruser on the other hand, mobile operators have been exploring network virtualization and cloud computing technologies to build cost-efficient and elastic mobile networks and to have them offered as a cloud service. In such cloud-based mobile networks,ensuring service resilience is an important challenge to tackle. Indeed, high availability and service reliability are importantrequirements of carrier grade, but not necessarily intrinsic features of cloud computing. Building a system that requiresthe five nines reliability on a platform that may not always grant it is therefore a hurdle. Effectively, in carrier cloud, serviceresilience can be heavily impacted by a failure of any network function (NF) running on a virtual machine (VM). In this paper,we introduce a framework, along with efficient and proactive restoration mechanisms, to ensure service resilience in carriercloud. As restoration of a NF failure impacts a potential number of users, adequate network overload control mechanisms are alsoproposed. A mathematical model is developed to evaluate the performance of the proposed mechanisms. The obtained resultsare encouraging and demonstrate that the proposed mechanisms efficiently achieve their design goals

Towards 5G Network Slicing over Multiple-Domains

“…We developed state of the art network slice life-cycle (from instantiation to termination of network slices to free network resources) management algorithms over a single technology, administrative domain as well as across multiple domains. These architectures are designed to be robust, resilient to NF failures such as the type discussed in and mathematically modeled in [16], reliable and adaptive to changes in users' needs and network behavior on the fly.…”

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

“…Equations (14) and (15) enforce that each RRH is associated with exactly one primary BBU pool and one backup BBU pool. Equation (16) enforces primary BBU pool and backup BBU pool to be at different nodes for the same RRH.…”

“…Ref. [15] introduces an efficient restoration mechanisms to ensure service resilience in 5G cloud-based mobile network.…”

A survey on network resiliency methodologies against weather-based disruptions

“…For instance, a re-instantiation of a virtualized mobility management entity (MME) in the evolved packet core (EPC) has an effect on the traffic to/from user equipment (UE) handled by the affected MME [48]. In [48] two proactive VNF failure restoration approaches are proposed aimed at the reduction of the network overload that may happen due to restoration control signalling messages where as soon as a MME VNF goes off or starts malfunctioning, a new MME VNF instance is initiated.…”

“…For instance, a re-instantiation of a virtualized mobility management entity (MME) in the evolved packet core (EPC) has an effect on the traffic to/from user equipment (UE) handled by the affected MME [48]. In [48] two proactive VNF failure restoration approaches are proposed aimed at the reduction of the network overload that may happen due to restoration control signalling messages where as soon as a MME VNF goes off or starts malfunctioning, a new MME VNF instance is initiated. The first mechanism is based on bulk signalling, i.e., it creates only one single message to replace a certain number of signalling messages in a bulk, while the second one creates message profile, i.e., reduces the signalling message header by replacing repetitive information element by a profile identifier.…”