Browsing by Author "Tekce F."

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    Analytical Delay Model of virtual CPE for 5G eMBB services in SD-CDN
    (Institute of Electrical and Electronics Engineers Inc., 2020) Erel-Ozcevik M.; Tekce F.; Kayapinar F.
    The high bandwidth and moderate latency requirements of enhanced Mobile BroadBand (eMBB) content in 5G are handled by Content Delivery Network (CDN) components such as customer premises equipment (CPE) in edge, branches in fog, and servers in the cloud. The indispensable goal of 5G network providers is meeting these requirements on the same physical component that reduces operational and capital expenditures (OPEX/CAPEX). However, we've believed that different configuration policies of providers can be only handled by Software-Defined CDN (SD-CDN). Moreover; due to the flow characteristics of eMBB and handling packet forwarding by only software-based component in an OpenFlow (OF) switch, obtained packet processing delay in conventional CPE has become challenging. Therefore, we propose SD-vCPE with a novel physical block diagram which includes hardware and software-based OF tables. The analytical models of conventional and SD-vCPE are also derived by using G/G/1 Markov queues, considering general eMBB flow characteristics, and SpeedUp parameters in the software part. According to analytical and simulation results, as the resolution of video content in eMBB is increased, the conventional CPE cannot handle delay in the microsecond level; whereas, proposed SD-vCPE outputs approximately 1-millisecond decrease on packet delay which differentiates according to matching rules in TCAM or CPU. Namely, the proposed analytical model for SD-vCPE results in a delay in an acceptable rate while comparing the simulation results performed in MATLAB. © 2020 IFIP.
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    SDN/NFV based Secure SCMA design in SDR
    (Institute of Electrical and Electronics Engineers Inc., 2021) Erel-Ozcevik M.; Tekce F.
    Due to increased mMTC devices in 5G, OFDMA has not been a solution for resource allocation in SDR. Therefore; SCMA which is one of the code domain NOMA has been using in such overloaded cases. As distinct from OFDMA, it uses also the constellation diagram as an addition to frequency and time domains in resource mapping to the mobile user equipment. The current studies do not consider UE prioritization while code allocation in SCMA is believed to enhance QoS of the whole topology. Moreover, due to the nature of SCMA, protecting the privacy of UE has become harder than conventional allocation strategies. The implementation details of secure SCMA does not consider by handling low OPEX/CAPEX. Therefore, in this paper, we introduce a novel SDN/NFV based SDR by handling these 5G paradigms into the same platform to overcome the aforementioned challenges. With SDN, we newly define a QoS metric; i.e. received power over overloading of SDR, for UE prioritization such as Micro and Macro UE in an SDR. With NFV, SDR can have two virtual roles shown to UEs by Macrocell and Microcell virtual network functions. With SDR, the SCMA code allocation is performed according to defined Macro and Micro codes are taken from generated codebooks. Afterward, it performs the asymmetric encryption algorithm to provide security of code allocations and the privacy of the user. According to performance evaluation; when overloading is 150%, the Micro UEs have 10x better BER than Macro UEs where the QoS is acceptable for the whole topology. © 2021 IFIP.
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    Mobile Access Aware Routing in Software-Defined Networks; [Yazilim Tabanli Aglarda Mobil Erisim Protokolune Duyarli Yonlendirme]
    (Institute of Electrical and Electronics Engineers Inc., 2021) Tas B.; Akova E.; Akcam A.; Tekce F.; Erel-Ozcevik M.
    Nowadays, there is huge increase on mobile traffic that cannot be managed in 5G requirements with the existing physical infrastructure. To handle these requirements, we consider the new mobile access protocols in 5G. They vary according to Android and iOS operating systems, and these devices use UDP-based QUIC and TCP-based HTTP/2 protocols for video access, respectively. Therefore, there is a need for dynamic routing of video traffic according to the mobile user in low OPEX/CAPEX. To handle this challenge, we use the Software- Defined Networks. However, conventional routers can open the header of the incoming packet up to transport layer and can only forward according to carrying over either TCP or UDP protocol. Even the standard OpenFlow protocol using communication between dummy switches and controller on SDN, does not support routing by application layer (Layer 5). Therefore; in this paper, a mobile access aware routing is proposed. In ONOSbased SDN control, the newly defined forwarding rate (Rate) is calculated periodically. A new algorithm has been proposed that dynamically directs iOS/Android based video traffic according to the threshold value of this ratio. The standard Reactive Forwarding algorithm in the ONOS does not consider the intensity and mobile traffic rate. As a result, these challenges have been overcome with proposed algorithm, and the QoS values of the video traffic have been met the 5G requirements. © 2021 IEEE.