Browsing by Subject "Software as a service (SaaS)"

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    OFaaS: OpenFlow Switch as a Service for Multi Tenant Slicing in SD-CDN
    (Institute of Electrical and Electronics Engineers Inc., 2021) Erel-Özçevik M.; Canberk B.
    In Software Defined-Content Delivery Networks (SD-CDN), the policies of tenants such as Youtube, Netflix, Office 365, etc. are not the same due to having different 5G traffic requirements for such contents as enhanced Mobile Broadband (eMBB), ultra-reliable low-latency (URLLC) and massive machine-type communication (mMTC). This leads SD-CDN multi-tenant slicing to provide different services with limited network resources, where each tenant can functionally manage their own virtual slice of a physical component according to service level agreements (SLAs). However, they are not permitted to dynamically configure their own components. Therefore, the physical end-to-end configuration of all edge devices causes extra hardware and bandwidth costs. Although software as a service (SaaS) is more preferred to handle cost-efficiency on a switch configuration that increases forwarding throughput (Mbps) with a less number of physical components in SD-CDN, the edge devices can be only served as infrastructure as a service (IaaS) currently. This motivation leads us to serve the switch as a service that includes both IaaS and SaaS characteristics. Therefore, we propose an OpenFlow as a service (OFaaS) design where each tenant has flow management and switch configuration permissions on their own virtual slice. In flow management, we define a novel Service Oriented Architecture (SOA) to orchestrate OFaaS driven topology by isolating each tenant from physical complexity. Here, each tenant can dynamically alter QoS on a flow and load balance between a sub-set of contents via OpenFlow protocol. In switch configuration; a novel OFaaS Management Algorithm for a multi-tenant slicing increases the number of tenants served per OpenFlow switch thanks to OFaaS design. It enables an end-to-end configuration via the NETCONF protocol with a novel YANG model of OFaaS. According to performance evaluation; OFaaS has the same forwarding throughput as conventional IaaS based OpenFlow switch for a homogenous content, whereas it has 71% more forwarding throughput (Mbps) and it has 40% more cost-efficient than conventional one for a heterogeneous content with $17 savings per tenant. © 2021 IEEE.
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    Sustainable fixed wireless access with blockchain secured software defined network
    (Elsevier B.V., 2023) Erel-Özçev ı ̇ k M.
    Recently, there has been a tremendous increase in the number of service providers offering Fixed Wireless Access (FWA). The main goal of service providers is to offer guaranteed service (GB/month) for all contents by meeting sustainability Key Performance Indicators (KPIs): cost-efficiency and security. To minimize the risk of physical deployment and handle partial recovery, network slicing between service providers is considered by using the same FWA as a service by joint consideration of Infrastructure as a Service (IaaS) and Software as a Service (SaaS). This can only be handled by Software-Defined Network (SDN) controlled OpenFlow-based FWA. However, current OpenFlow switches in the market are used only as IaaS which does not meet cost-efficiency requirement alone. The software-defined OpenFlow tables can be increased by network administrator, which is not recommended because of having no authorization limitation and poses configuration risks on the device. Here, the research question is how can the service providers keep their own network sustainable by using infrastructure in a secure, cost-efficient, and conforming to the standard in a fair way? Therefore, Sustainable Fixed Wireless Access (SFWA) is newly proposed by OpenFlow-based blockchain in this paper. To handle low computational work and fair scheduling, Proof of Stake (PoS) consensus mechanism and Weighted Fair Content Scheduling algorithms are proposed for the validation process of the blocks that stores dynamic configuration details of service providers. At the end of the whole procedure, the valid blockchain is stored in the Secure Policy Database in OpenFlow-based FWA switches. According to performance evaluation, eMBB and URLLC contents can be served by 40% and 53% discount on cost per user with guaranteed service in FWA. The service provider offers a more sustainable network by blockchain-based secured SFWA than the conventional centralized authority-based FWA. © 2023 Elsevier B.V.