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Raza, M. R., Rostaini, A., Wosinska, L. & Monti, P. (2019). A Slice Admission Policy Based on Big Data Analytics for Multi-Tenant 5G Networks. Journal of Lightwave Technology, 37(7), 1690-1697
Open this publication in new window or tab >>A Slice Admission Policy Based on Big Data Analytics for Multi-Tenant 5G Networks
2019 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, no 7, p. 1690-1697Article in journal (Refereed) Published
Abstract [en]

Network slicing is a key concept in 5G networking. It enables an infrastructure provider (InP) to support heterogeneous services over a common platform by creating a customized slice for each one of them. Once in operation, the slices can be dynamically scaled up/down to match the variation of service requirements. Although an InP generates revenue by accepting a slice request, however it might need to pay a penalty (proportional to the level of service degradation) if a slice cannot be scaled up when required. Hence, it becomes crucial to decide which slice requests should be accepted in order to maximize the net profit of an InP. This paper presents a slice admission strategy based on big data analytics (BDA) predictions. The intuition is to accept a slice request only when it is estimated that no service degradation will take place for both the incoming slice request and the slices already in operation. In this way, the penalty paid by an InP is contained, with beneficial effects on the overall net profit. Apart from simulations, the performance of the proposed admission policy has also been evaluated using emulation. Simulation results show that, in the presence of a high penalty due to service degradation, using BDA predictions brings up to 50.7% increase in profit, as compared to a slice admission policy without BDA. Emulation results for a small network scenario show a profit increase of up to 383% with only a small impact on the slice provisioning time (i.e., due to the processing of BDA predictions).

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Keywords
5G, big data analytics, dynamic slicing, network function virtualization, optical networks, resource orchestration, software defined networking
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-251211 (URN)10.1109/JLT.2019.2896138 (DOI)000464133000006 ()2-s2.0-85064079238 (Scopus ID)
Note

QC 20190618

Available from: 2019-06-18 Created: 2019-06-18 Last updated: 2019-06-19Bibliographically approved
Li, J., Shen, X., Chen, L., Ou, J., Wosinska, L. & Chen, J. (2019). Delay-aware bandwidth slicing for service migration in mobile backhaul networks. Journal of Optical Communications and Networking, 11(4), B1-B9, Article ID 8697074.
Open this publication in new window or tab >>Delay-aware bandwidth slicing for service migration in mobile backhaul networks
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2019 (English)In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 11, no 4, p. B1-B9, article id 8697074Article in journal (Refereed) Published
Abstract [en]

Fog computing is expected to be integrated with communication infrastructure, giving rise to the concept of fog-enhanced radio access networks (FeRANs) to support various mission-critical applications. Such architecture brings computation capabilities closer to end users, thereby reducing the communication latency to access services. In the context of FeRAN, service migration is needed to tackle limited resources in a single fog node and to provide continuous service for mobile end users. To support service migration, high capacity and low latency are required in mobile backhaul networks. Passive optical networks can be a promising solution for such mobile back-haul, in which bandwidth is shared by both migration traffic and that which is not associated with service migration. In this paper, we propose a bandwidth slicing mechanism, in which the bandwidth can be provisioned to the migration traffic and non-migration traffic dynamically and effectively to meet their different delay requirements. Simulation results verify that the proposed delay-aware bandwidth slicing scheme can handle the migration traffic properly, i.e., sending it within a required time threshold, while limiting the impact of the migration traffic on the latency and jitter of the non-migration traffic, particularly that with high priority.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Bandwidth slicing, Fog computing, Mobile backhaul, Service migration, Bandwidth, Fog, Passive networks, Passive optical networks, Radio access networks, Communication infrastructure, Communication latency, Continuous services, Mission critical applications, Mobile backhaul networks, Mobile backhauls, Support services
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-255958 (URN)10.1364/JOCN.11.0000B1 (DOI)2-s2.0-85064096164 (Scopus ID)
Note

QC 20190815

Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-27Bibliographically approved
Cheng, Y., Lin, R., De Andrade, M., Wosinska, L. & Chen, J. (2019). Disaggregated Data Centers: Challenges and Tradeoffs. IEEE Communications Magazine
Open this publication in new window or tab >>Disaggregated Data Centers: Challenges and Tradeoffs
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2019 (English)In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896Article in journal (Other academic) Submitted
Abstract [en]

Resource utilization of modern data centers is significantly limited by the mismatch between the diversity of the resources required by running applications and the fixed amount of hardwired resources (e.g., number of central processing unit CPU cores, size of memory) in the server blades. In this regard, the concept of function disaggregation is introduced, where the integrated server blades containing all types of resources are replaced by the resource blades including only one specific function. Therefore, disaggregated data centers can offer high flexibility for resource allocation and hence their resource utilization can be largely improved. In addition, introducing function disaggregation simplifies the system upgrade, allowing for a quick adoption of new generation components in data centers. However, the communication between different resources faces severe problems in terms of latency and transmission bandwidth required. In particular,the CPU-memory interconnects in fully disaggregated data centers require ultra-low latency and ultra-high transmission bandwidth in order to prevent performance degradation for running applications. Optical fiber communication is a promising technique to offer high capacity and low latency, but it is still very challenging for the state-of-the-art optical transmission technologies to meet the requirements of the fully disaggregated data centers. In this paper, different levels of function disaggregation are investigated. For the fully disaggregated data centers, two architectural options are presented, where optical interconnects are necessary for CPU-memory communications. We review the state-of-the-art optical transmission technologies and carry out performance assessment when employing them to support function disaggregation in data centers. The results reveal that function disaggregation does improve the efficiency of resource usage in the data centers, although the bandwidth provided by the state-of-the-art optical transmission technologies is not always sufficient for the fully disaggregated data centers. It calls for research in optical transmission to fully utilize the advantages of function disaggregation in data centers.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-244839 (URN)
Note

QC 20190301

Available from: 2019-02-28 Created: 2019-02-28 Last updated: 2019-03-01Bibliographically approved
Natalino, C., Idzikowski, F., Chiaraviglio, L., Wosinska, L. & Monti, P. (2019). Energy- and fatigue-aware RWA in optical backbone networks. Optical Switching and Networkning Journal, 31, 193-201
Open this publication in new window or tab >>Energy- and fatigue-aware RWA in optical backbone networks
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2019 (English)In: Optical Switching and Networkning Journal, ISSN 1573-4277, E-ISSN 1872-9770, Vol. 31, p. 193-201Article in journal (Refereed) Published
Abstract [en]

Connection provisioning in Wavelength Division Multiplexing (WDM) networks needs to account for a number of crucial parameters. On the one hand, operators need to ensure the connection availability requirements defined in Service Level Agreements (SLAs). This is addressed by selecting an appropriate amount of backup resources and recovery strategies for the connections over which services are provisioned. Services requiring less strict availability requirements can be routed over unprotected lightpaths. Services with more strict availability requirements are provisioned over protected lightpaths in order to cope with possible failures in the network. Another important aspect to consider during the provisioning process is energy efficiency. Green strategies leverage on setting network devices in Sleep Mode (SM) or Active Mode (AM) depending on whether or not they are needed to accommodate traffic. However, frequent power state changes introduce thermal fatigue which in turn has a negative effect on the device lifetime. Finally, in multi-period traffic scenarios, it is also important to minimize the number of reconfigurations of lightpaths already established in the network in order to avoid possible traffic disruptions at higher layers. The work presented in this paper tackles the connection provisioning paradigm in an optical backbone network with a multi-period traffic scenario. More specifically the paper looks into the interplay among (i) energy efficiency, (ii) thermal fatigue, and (iii) lightpath reconfiguration aspects. To this end, the Energy and Fatigue Aware Heuristic with Unnecessary Reconfiguration Avoidance (EFAH-URA) is introduced, showing that it is possible to balance the three aspects mentioned above in an efficient way. When compared to the pure energy-aware strategies, EFAH-URA significantly improves the average connection availability for both unprotected and protected connections. On the other hand, it is done at the expense of reduced energy saving.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
Keywords
Acceleration factor, Connection availability, Device lifetime, Green provisioning, Lightpath reconfiguration, Optical backbone network operation, Thermal fatigue
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-241188 (URN)10.1016/j.osn.2018.10.007 (DOI)000454380100016 ()2-s2.0-85056257635 (Scopus ID)
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved
Bogoni, A., Mecozzi, A., Okonkwo, C. M., Plant, D. V., Saitoh, K., Wosinska, L., . . . Gaudino, R. (2019). Foreword to the Special Issue on the 44th European Conference on Optical Communication (ECOC 2018). Journal of Lightwave Technology, 37(5), 1450-1455
Open this publication in new window or tab >>Foreword to the Special Issue on the 44th European Conference on Optical Communication (ECOC 2018)
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2019 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, no 5, p. 1450-1455Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-249819 (URN)10.1109/JLT.2019.2905487 (DOI)000463027400001 ()2-s2.0-85063802973 (Scopus ID)
Note

QC 20190423

Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-04-23Bibliographically approved
Natalino, C., Yayimli, A., Wosinska, L. & Furdek, M. (2019). Infrastructure upgrade framework for Content Delivery Networks robust to targeted attacks. Optical Switching and Networkning Journal, 31, 202-210
Open this publication in new window or tab >>Infrastructure upgrade framework for Content Delivery Networks robust to targeted attacks
2019 (English)In: Optical Switching and Networkning Journal, ISSN 1573-4277, E-ISSN 1872-9770, Vol. 31, p. 202-210Article in journal (Refereed) Published
Abstract [en]

Content Delivery Networks (CDNs) are crucial for enabling delivery of services that require high capacity and low latency, primarily through geographically-diverse content replication. Optical networks are the only available future-proof technology that meets the reach and capacity requirements of CDNs. However, the underlying physical network infrastructure is vulnerable to various security threats, and the increasing importance of CDNs in supporting vital services intensifies the concerns related to their robustness. Malicious attackers can target critical network elements, thus severely degrading network connectivity and causing large-scale service disruptions. One way in which network operators and cloud computing providers can increase the robustness against malicious attacks is by changing the topological properties of the network through infrastructure upgrades. This work proposes a framework for CDN infrastructure upgrade that performs sparse link and replica addition with the objective of maximizing the content accessibility under targeted link cut attacks. The framework is based on a newly defined content accessibility metric denoted as mu-ACA which allows the network operator to gauge the CDN robustness over a range of attacks with varying intensity. Two heuristics, namely Content-Accessibility Aware Link Addition Heuristic (CAA-LAH), and Content-Accessibility-Aware Replica Addition Heuristic (CAA-RAH) are developed to perform strategic link and replica placement, respectively, and hamper attackers from disconnecting users from the content even in severe attack scenarios. Extensive experiments on real-world reference network topologies show that the proposed framework effectively increases the CDN robustness by adding a few links or replicas to the network.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
Keywords
Content delivery networks, Content replica addition, Infrastructure upgrade, Link addition, Network robustness, Optical networks, Targeted attacks
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-241189 (URN)10.1016/j.osn.2018.10.006 (DOI)000454380100017 ()2-s2.0-85056237720 (Scopus ID)
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved
Wiatr, P., Chen, J., Monti, P., Wosinska, L. & Yuan, D. (2019). Routing and wavelength assignment vs. EDFA reliability performance in optical backbone networks: An operational cost perspective. Optical Switching and Networkning Journal, 31, 211-217
Open this publication in new window or tab >>Routing and wavelength assignment vs. EDFA reliability performance in optical backbone networks: An operational cost perspective
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2019 (English)In: Optical Switching and Networkning Journal, ISSN 1573-4277, E-ISSN 1872-9770, Vol. 31, p. 211-217Article in journal (Refereed) Published
Abstract [en]

A failure in optical backbone network can cause tremendous consequences as a substantial number of connections often each carrying a large amount of data can be interrupted. Therefore, high reliability performance is essential for the network operators. Many existing works that aim at improving network reliability performance implicitly assume that the lifetime of devices is constant and independent of the traffic load. However, the reliability performance of a device is related to its occupancy. For example, the failure rate of erbium doped fiber amplifier (EDFA) can be expressed as a function of the number of amplified wavelengths. On the other hand, the choice of routing and wavelength assignment (RWA) algorithm impacts the link load and, as a consequence, can influence the number of EDFA failures in the network. In this paper we examine how RWA can impact the failure reparation related network operational costs. Several types of RWA approaches are considered, namely load-balancing, energy-awareness, and reliability-awareness. Among all the considered RWA algorithms, the reliability-aware RWA (RA-RWA) approach leverages on EDFA reliability profile to reduce the number of EDFA failures in the network and the related operational costs. The simulation results show that the RWA algorithm impacts in a significant way the operational costs caused by EDFA failures. The cost associated with reparation of an EDFA decreases by 7.8% (in case of RA-RWA) and increases by up to 40% (in case of a load-balancing approach) compared to the classical Shortest Path (SP) approach. Moreover, the cost caused by connection rerouting due to link unavailability triggered by EDFA failure exhibits a 20% decrease (RA-RWA) and up to 94% increase (energy-aware algorithm). We also analyze some key network performance metrics that may be affected by RWA, including blocking probability, link occupancy distribution, and path length.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
Keywords
Device reliability performance, Device reliability profile, Routing and wavelength assignment (RWA), Erbium doped fiber amplifier (EDFA), Optical backbone networks
National Category
Computer Systems
Identifiers
urn:nbn:se:kth:diva-241190 (URN)10.1016/j.osn.2018.10.005 (DOI)000454380100018 ()2-s2.0-85056245448 (Scopus ID)
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved
Natalino, C., Coelho, F., Lacerda, G., Braga, A., Wosinska, L. & Monti, P. (2018). A Proactive Restoration Strategy for Optical Cloud Networks Based on Failure Predictions. In: Jaworski, M Marciniak, M (Ed.), 20th International Conference on Transparent Optical Networks, ICTON 2018: . Paper presented at 20th International Conference on Transparent Optical Networks (ICTON), JUL 01-05, 2018, Univ Politehnica Bucharest, Cent Lib, Bucharest, ROMANIA. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8473938.
Open this publication in new window or tab >>A Proactive Restoration Strategy for Optical Cloud Networks Based on Failure Predictions
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2018 (English)In: 20th International Conference on Transparent Optical Networks, ICTON 2018 / [ed] Jaworski, M Marciniak, M, Institute of Electrical and Electronics Engineers (IEEE), 2018, article id 8473938Conference paper, Published paper (Refereed)
Abstract [en]

Failure prediction based on the anomaly detection/forecasting is becoming a reality thanks to the introduction of machine learning techniques. The orchestration layer can leverage on this new feature to proactively reconfigure cloud services that might find themselves traversing an element that is about to fail. As a result, the number of cloud service interruptions can be reduced with beneficial effects in terms of cloud service availability. Based on the above intuition, this paper presents an orchestration strategy for optical cloud networks able to reconfigure vulnerable cloud services (i.e., the ones that would be disrupted if a predicted failure happens) before an actual failure takes place. Simulation results demonstrate that, with a single link failure scenario, proactive restoration can lead to up to 97% less cloud services having to be relocated. This result brings considerable benefits in terms of cloud service availability, especially in low load conditions. It is also shown that these improvements come with almost no increase in the cloud service blocking probability performance,i.e., resource efficiency is not impacted.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Series
International Conference on Transparent Optical Networks-ICTON, ISSN 2162-7339
Keywords
Proactive recovery, Failure prediction, Resiliency, Cloud services, Availability, Restoration, Software defined networking (SDN), Orchestration, Cloud service relocation
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-249911 (URN)10.1109/ICTON.2018.8473938 (DOI)000462559300315 ()2-s2.0-85055475932 (Scopus ID)978-1-5386-6605-0 (ISBN)
Conference
20th International Conference on Transparent Optical Networks (ICTON), JUL 01-05, 2018, Univ Politehnica Bucharest, Cent Lib, Bucharest, ROMANIA
Note

QC 20190502

Available from: 2019-05-02 Created: 2019-05-02 Last updated: 2019-05-02Bibliographically approved
Raza, M. R., Natalino, C., Öhlen, P., Wosinska, L. & Monti, P. (2018). A Slice Admission Policy Based on Reinforcement Learning for a 5G Flexible RAN. In: : . Paper presented at 44th European Conference and Exhibition on Optical Communication (ECOC).
Open this publication in new window or tab >>A Slice Admission Policy Based on Reinforcement Learning for a 5G Flexible RAN
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2018 (English)Conference paper, Published paper (Refereed)
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-235258 (URN)
Conference
44th European Conference and Exhibition on Optical Communication (ECOC)
Note

QC 20180920

Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-10-19Bibliographically approved
Yaghoubi, F., Mahloo, M., Wosinska, L., Monti, P., Farias, F. d., Weyl Albuquerque Costa, J. C. & Chen, J. (2018). A techno-economic framework for 5G transport networks. IEEE wireless communications, 25(5), 56-63
Open this publication in new window or tab >>A techno-economic framework for 5G transport networks
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2018 (English)In: IEEE wireless communications, ISSN 1536-1284, E-ISSN 1558-0687, Vol. 25, no 5, p. 56-63Article in journal (Refereed) Published
Abstract [en]

Wireless heterogeneous networks (HetNets) are a cost- and energy-efficient alternative to provide high capacity to end users in the future 5G communication systems. However, the transport segment of a RAN poses a big challenge in terms of cost and energy consumption. In fact, if not planned properly, its resulting high cost might limit the benefits of using small cells and impact the revenues of mobile network operators. Therefore, it is essential to be able to properly assess the economic viability of different transport technologies as well as their impact on the cost and profitability of a HetNet deployment (i.e., RAN plus transport). This article first presents a general and comprehensive techno-economic framework able to assess not only the TCO but also the business viability of a HetNet deployment. The framework is then applied to the specific case study of a backhaul-based transport segment. In the evaluation work two technology options for the transport network are considered (i.e., microwave and fiber) assuming both a homogeneous (i.e., macrocells only) and a HetNet deployment. Our results demonstrate the importance of selecting the right technology and deployment strategy in order not to impact the economic benefits of a HetNet deployment. Moreover, the results also reveal that a deployment solution with the lowest TCO does not always lead to the highest profit.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2018
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-239826 (URN)10.1109/MWC.2018.1700233 (DOI)000450162600009 ()2-s2.0-85056548451 (Scopus ID)
Note

QC 20181217

Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2019-06-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6704-6554

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