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Wallin, Stefan
Publications (10 of 22) Show all publications
Moberg, C. & Wallin, S. (2016). A two-layered data model approach for network services (ed.). Paper presented at . IEEE Communications Magazine, 54(3), 76-80
Open this publication in new window or tab >>A two-layered data model approach for network services
2016 (English)In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 54, no 3, p. 76-80Article in journal (Refereed) Published
Abstract [en]

Connectivity services are ubiquitous to enterprises, and many enterprises are looking to outsource basic networking services traditionally implemented using on-premise network equipment. The rising expectations on service providers to rapidly change the definition of services and the ability to introduce new types of network elements is leading to exploding complexity in the orchestration layer. The severity of this problem is such that the ability to introduce new services and new device vendors in the network is reduced due to thetime and cost associated with such changes.

National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-7324 (URN)10.1109/MCOM.2016.7432175 (DOI)5ae6f600-94db-4528-9003-e4cedf3e3361 (Local ID)5ae6f600-94db-4528-9003-e4cedf3e3361 (Archive number)5ae6f600-94db-4528-9003-e4cedf3e3361 (OAI)
Note
Validerad; 2016; Nivå 2; 20160331 (stewal)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved
Wallin, S., Nordlander, J. & Leijon, V. (2014). Semantic Alarms (ed.). In: (Ed.), Alex Galis; Gaby Lenhart (Ed.), 3rd ETSI Future Networks Workshop, 9-11 april 2013, Sophia Antipolis, France: . Paper presented at ETSI Future Networks Workshop : 09/04/2013 - 11/04/2013 (pp. 145-153).
Open this publication in new window or tab >>Semantic Alarms
2014 (English)In: 3rd ETSI Future Networks Workshop, 9-11 april 2013, Sophia Antipolis, France / [ed] Alex Galis; Gaby Lenhart, 2014, p. 145-153Conference paper, Published paper (Other (popular science, discussion, etc.))
Abstract [en]

Functions Virtualisation (NFV) and Software Driven Networks (SDN) aggregate resources across multiple domains. This puts requirements on understanding the overall alarm status across these domains and dependencies between them. Current practice of low-quality alarm documentation and confusion around fundamental concepts like alarm states, alarm-types and the underlying protocols like syslog and SNMP traps makes it hard to create one unified alarm interface as part of the SDN API.If alarm interfaces for the various components were expressed in a more formal manner including dependencies and propagation between the alarms the NFV/SDN interface could automatically present an integrated alarm API as well as a synthesized alarm state across the virtualized functions.We present a novel approach to alarm interfaces by providing a formal alarm model together with a domain-specific language that allows us to specify both the alarm models and the constraints placed on the alarm models in a consistent manner. This means that we can verify the consistency of an alarm interfaces and automatically generate interfaces, multi-domain correlation and aggregated states.

National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-34312 (URN)87b4f50c-cfae-4297-ad39-f454428300c1 (Local ID)979-10-92620-00-9 (ISBN)87b4f50c-cfae-4297-ad39-f454428300c1 (Archive number)87b4f50c-cfae-4297-ad39-f454428300c1 (OAI)
Conference
ETSI Future Networks Workshop : 09/04/2013 - 11/04/2013
Note
Godkänd; 2014; 20140110 (stewal)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Wallin, S., Nordlander, J. & Åhlund, C. (2012). Rethinking network management: models, data-mining and self-learning (ed.). In: (Ed.), (Ed.), Proceedings of the 2012 IEEE Network Operations and Management Symposium: Maui, HI 16- 20 April 2012. Paper presented at IEEE/IFIP Network Operations and Management Symposium : 16/04/2012 - 19/04/2012 (pp. 880-886). Piscataway, NJ: IEEE Communications Society
Open this publication in new window or tab >>Rethinking network management: models, data-mining and self-learning
2012 (English)In: Proceedings of the 2012 IEEE Network Operations and Management Symposium: Maui, HI 16- 20 April 2012, Piscataway, NJ: IEEE Communications Society, 2012, p. 880-886Conference paper, Published paper (Refereed)
Abstract [en]

Network Service Providers are struggling to re- duce cost and still improve customer satisfaction. We have looked at three underlying challenges to achieve these goals; an overwhelming flow of low-quality alarms, understanding the structure and quality of the delivered services, and automation of service configuration. This thesis proposes solutions in these areas based on domain-specific languages, data-mining and self- learning. Most of the solutions have been validated based on data from a large service provider.We look at how domain-models can be used to capture explicit knowledge for alarms and services. In addition, we apply data- mining and self-learning techniques to capture tacit knowledge. The validation shows that models improve the quality of alarm and service models, and automatically render functions like root cause correlation, service and SLA status, as well as service configuration automation.The data-mining and self-learning solutions show that we can learn from available decisions made by experts and automatically assign alarm priorities.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2012
Series
I E E E - I F I P Network Operations and Management Symposium, ISSN 1542-1201
National Category
Computer Sciences Media and Communication Technology
Research subject
Dependable Communication and Computation Systems; Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-29298 (URN)10.1109/NOMS.2012.6212003 (DOI)2-s2.0-84864217904 (Scopus ID)2b9e6f6e-7e84-4edb-b7bb-979ccd10f5e8 (Local ID)978-1-4673-0267-8 (ISBN)978-1-4673-0268-5 (ISBN)2b9e6f6e-7e84-4edb-b7bb-979ccd10f5e8 (Archive number)2b9e6f6e-7e84-4edb-b7bb-979ccd10f5e8 (OAI)
Conference
IEEE/IFIP Network Operations and Management Symposium : 16/04/2012 - 19/04/2012
Note
Godkänd; 2012; 20111223 (stewal)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Wallin, S. (2012). Rethinking network management solutions: models, data-mining and self-learning (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Rethinking network management solutions: models, data-mining and self-learning
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Network service providers are struggling to reduce cost while at the same time improving customer satisfaction. This thesis addresses three relevant underlying challenges to achievieng these goals: - managing an overwhelming flow of low-quality alarms - understanding the structure and quality of the delivered services - automation of service configurationAll of the these add to an operator's operational costs since manual work is required in order to understand the alarm and service status as well as for configuring new services. We propose solutions based on domain-specific languages, data-mining and self-learning. We look at how domain-models can be used to capture explicit knowledge for alarms and services. In addition, we apply data-mining and self-learning techniques to understand the alarm semantics. The alarm solution is validated with a quantitative analysis based on real alarm documentation and an alarm database from a large mobile service provider. A qualitative analysis of the service management solutions is given based on prototypes and input from service providers.We present an approach to alarm interfaces by providing a formal alarm model together with a domain-specic language, BASS. This means that we can verify the consistency of an alarm interface and automatically generate artifacts such as alarm correlation rules or alarm documentation based directly on the model. From a baseline without any correlation, our alarm domain-model based on vendor documentation could automatically find the root-cause alarms in 40% of the cases. In the process of producing an alarm model from pre-existing alarm documentation for a commercial product, we found over 150 semantic warnings.We also propose a domain specific language called SALmon, which allows for efficient representation of service models, along with a computational engine for calculation of service status. Furthermore, this thesis illustrates how we can achieve automatic service configuration based on YANG, the domain-specific language standardized in the IETF. Prototypes show that the service domain-models can capture the semantics of service models, and automatically render parts of the service management solution. It is not always possible to capture expert knowledge in models. Therefore, we propose a data-mining and self-learning solution that learns alarm priorities from the decisions taken by the network administrators. The solution assigns the same severity as a human expert in 50% of the cases compared to 17% for the original alarm severity.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-17778 (URN)524ec0f6-7cb3-45bd-b350-72a21f0b7c6e (Local ID)978-91-7439-390-3 (ISBN)524ec0f6-7cb3-45bd-b350-72a21f0b7c6e (Archive number)524ec0f6-7cb3-45bd-b350-72a21f0b7c6e (OAI)
Note
Godkänd; 2012; 20120116 (stewal); DISPUTATION Namn: Stefan Wallin Ämnesområde: Mobila system/Mobile Systems Opponent: Professor Rolf Stadler, Skolan för elektro- och systemteknik, KTH, Stockholm, Ordförande: Professor Christer Åhlund, Institutionen för system- och rymdteknik, Luleå tekniska universitet Tid: Torsdag den 23 februari 2012, kl 10.00 Plats: D770, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved
Wallin, S., Leijon, V., Nordlander, J. & Bystedt, N. (2012). The semantics of alarm definitions: enabling systematic reasoning about alarms (ed.). Paper presented at . International Journal of Network Management, 22(3), 181-198
Open this publication in new window or tab >>The semantics of alarm definitions: enabling systematic reasoning about alarms
2012 (English)In: International Journal of Network Management, ISSN 1055-7148, E-ISSN 1099-1190, Vol. 22, no 3, p. 181-198Article in journal (Refereed) Published
Abstract [en]

The development and integration of an alarm interface between network elements and a network management system is a costly process, largely because of the informal way in which alarm interfaces are expressed and communicated. Low-quality alarm documentation and confusion around fundamental concepts like alarm states and alarm types are typical consequences of current practices. If alarm interfaces were expressed in a more formal manner, costs could be reduced and more advanced analysis and automation would be enabled. We present a novel approach to alarm interfaces by providing a formal alarm model together with a domain-specific language that allows us to specify both the alarm models and the constraints placed on the alarm models in a consistent manner. This means that we can verify the consistency of an alarm interface and automatically generate artifacts such as alarm correlation rules or alarm documentation based only on the model

National Category
Computer Sciences Embedded Systems Media and Communication Technology
Research subject
Dependable Communication and Computation Systems; Embedded System; Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-9940 (URN)10.1002/nem.800 (DOI)000304086500002 ()2-s2.0-84861228987 (Scopus ID)8a85d927-d9c0-4374-a663-db3161ee6034 (Local ID)8a85d927-d9c0-4374-a663-db3161ee6034 (Archive number)8a85d927-d9c0-4374-a663-db3161ee6034 (OAI)
Note
Validerad; 2012; 20110207 (stewal)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Wallin, S. & Wikström, C. (2011). Automating network and service configuration using NETCONF and YANG (ed.). In: (Ed.), Proceedings of LISA 11: 25th Large Installation System Administration Conference. Paper presented at Usenix Large Installation System Administration Conference : 04/12/2011 - 09/12/2011 (pp. 267-279). USENIX - The Advanced Computing Systems Association
Open this publication in new window or tab >>Automating network and service configuration using NETCONF and YANG
2011 (English)In: Proceedings of LISA 11: 25th Large Installation System Administration Conference, USENIX - The Advanced Computing Systems Association, 2011, p. 267-279Conference paper, Published paper (Refereed)
Abstract [en]

Network providers are challenged by new requirements for fast and error-free service turn-up. Existing approaches to configuration management such as CLI scripting, device-specific adapters, and entrenched commercial tools are an impediment to meeting these new requirements. Up until recently, there has been no standard way of configuring network devices other then SNMP and SNMP is not optimal for configuration management. The IETF has released NETCONF and YANG which are standards focusing on Configuration management. We have validated that NETCONF and YANG greatly simplify the configuration management of devices and services and still provide good performance. Our performance tests are run in a cloud managing 2000 devices. Our work can help existing vendors and service providers to validate a standardized way to build configuration management solutions.

Place, publisher, year, edition, pages
USENIX - The Advanced Computing Systems Association, 2011
National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-28200 (URN)1ea61198-eb97-4064-ab6c-24093f0d3da2 (Local ID)1ea61198-eb97-4064-ab6c-24093f0d3da2 (Archive number)1ea61198-eb97-4064-ab6c-24093f0d3da2 (OAI)
Conference
Usenix Large Installation System Administration Conference : 04/12/2011 - 09/12/2011
Note

Godkänd; 2011; 20110718 (stewal)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Handurukande, S., Fedor, S., Wallin, S. & Zach, M. (2011). Magneto approach to QoS monitoring (ed.). In: (Ed.), Proceedings of the 12th IFIP/IEEE International Symposium on Integrated Network Management: . Paper presented at IFIP/IEEE International Symposium on Integrated Network Management : 23/05/2011 - 27/05/2011 (pp. 209-216). Piscataway, NJ: IEEE Communications Society
Open this publication in new window or tab >>Magneto approach to QoS monitoring
2011 (English)In: Proceedings of the 12th IFIP/IEEE International Symposium on Integrated Network Management, Piscataway, NJ: IEEE Communications Society, 2011, p. 209-216Conference paper, Published paper (Refereed)
Abstract [en]

Quality of Service (QoS) monitoring of end-user services is an integral and indispensable part of service management. However in large, heterogeneous and complex networks where there are many services, many types of end-user devices, and huge numbers of subscribers, it is not trivial to monitor QoS and estimate the status of Service Level Agreements (SLAs). Furthermore, the overwhelming majority of end-terminals do not provide precise information about QoS which aggravates the difficulty of keeping track of SLAs. In this paper, we describe a solution that combines a number of techniques in a novel and unique way to overcome the complexity and difficulty of QoS monitoring. Our solution uses a model driven approach to service modeling, data mining techniques on small sample sets of terminal QoS reports (from “smarter” end-user devices), and network level key performance indicators (N-KPIs) from probes to address this problem. Service modeling techniques empowered with a modeling engine and a purpose-built language hide the complexity of SLA status monitoring. The data mining technique uses its own engine and learnt data models to estimate QoS values based on N-KPIs, and feeds the estimated values to the modeling engine to calculate SLAs. We describe our solution, the prototype and experimental results in the paper.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2011
National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-29433 (URN)10.1109/INM.2011.5990693 (DOI)80052751584 (Scopus ID)2e907b30-e8cb-11df-8b36-000ea68e967b (Local ID)978-1-4244-9219-0 (ISBN)978-1-4244-9220-6 (ISBN)2e907b30-e8cb-11df-8b36-000ea68e967b (Archive number)2e907b30-e8cb-11df-8b36-000ea68e967b (OAI)
Conference
IFIP/IEEE International Symposium on Integrated Network Management : 23/05/2011 - 27/05/2011
Note

Godkänd; 2011; 20110914 (ysko)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Wallin, S. (2011). UML visualization of YANG models (ed.). In: (Ed.), Proceedings of the 12th IFIP/IEEE International Symposium on Integrated Network Management: . Paper presented at IFIP/IEEE International Symposium on Integrated Network Management : 23/05/2011 - 27/05/2011 (pp. 1129-1134). Piscataway, NJ: IEEE Communications Society
Open this publication in new window or tab >>UML visualization of YANG models
2011 (English)In: Proceedings of the 12th IFIP/IEEE International Symposium on Integrated Network Management, Piscataway, NJ: IEEE Communications Society, 2011, p. 1129-1134Conference paper, Published paper (Refereed)
Abstract [en]

Formal data-models are one of the corner-stones of automatic network management. We need semantic models that can be automatically interpreted by management applications. At the same time, human domain-experts need to be able to understand the models. This dualistic requirement has lead standard organizations to pick modeling approaches that prioritize either humans or automatic software. YANG is a semantically rich data-modeling language. We have defined a mapping of YANG to UML and a tool that renders UML diagrams from YANG models. This enables the benefits of formal languages for defining interfaces and automatically maintained UML diagrams to involve domain experts.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2011
National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-38236 (URN)10.1109/INM.2011.5990524 (DOI)80052734232 (Scopus ID)c8f145fb-52c9-49b7-902a-c3e72236331e (Local ID)978-1-4244-9219-0 (ISBN)978-1-4244-9220-6 (ISBN)c8f145fb-52c9-49b7-902a-c3e72236331e (Archive number)c8f145fb-52c9-49b7-902a-c3e72236331e (OAI)
Conference
IFIP/IEEE International Symposium on Integrated Network Management : 23/05/2011 - 27/05/2011
Note

Godkänd; 2011; 20110207 (stewal)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-01-14Bibliographically approved
Handurukande, S., Wallin, S. & Jonsson, A. (2010). IPTV service modeling in Magneto networks (ed.). In: (Ed.), 2010 IEEE/IFIP Network Operations and Management Symposium workshops: NOMS 2010 workshops ; 19 - 23 April 2010, Osaka, Japan. Paper presented at IEEE/IFIP International Workshop on Broadband Convergence Networks (BcN) : 19/04/2010 - 19/04/2010 (pp. 51-54). Piscataway, NJ: IEEE Communications Society
Open this publication in new window or tab >>IPTV service modeling in Magneto networks
2010 (English)In: 2010 IEEE/IFIP Network Operations and Management Symposium workshops: NOMS 2010 workshops ; 19 - 23 April 2010, Osaka, Japan, Piscataway, NJ: IEEE Communications Society, 2010, p. 51-54Conference paper, Published paper (Refereed)
Abstract [en]

One of the main steps of service assurance is service monitoring using Key Performance Indicators (KPIs) and Service Level Agreements (SLAs). We show an approach for service modeling, first starting with an abstract service model that depends on the network. And then, we show how a corresponding model can be realized using a domain specific language. This solution is able to condense various sources of service model requirements into a condense formal and executable model including service decomposition and KPI aggregation. We have described this solution in the context of Magneto project and uses IPTV as a service in our description

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2010
National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-28623 (URN)10.1109/NOMSW.2010.5486602 (DOI)27b48c70-1c66-11df-be83-000ea68e967b (Local ID)978-1-4244-6037-3 (ISBN)27b48c70-1c66-11df-be83-000ea68e967b (Archive number)27b48c70-1c66-11df-be83-000ea68e967b (OAI)
Conference
IEEE/IFIP International Workshop on Broadband Convergence Networks (BcN) : 19/04/2010 - 19/04/2010
Note

Godkänd; 2010; 20100218 (stewal)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Wallin, S. (2009). Alarm and service monitoring of large scale multi-service mobile networks (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Alarm and service monitoring of large scale multi-service mobile networks
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Two of the most important challenges in network service assurance are * an overwhelming flow of low-quality alarms * to understand the structure and quality of the delivered services This thesis proposes solutions for alarm and service monitoring that addresses monitoring of large scale multi-service mobile networks. The work on alarms are based on statistical analysis of data collected from a real-world alarm flow and an associated trouble ticket database containing the network administrators expert knowledge. Using data from the trouble ticketing system as a reference, we examine the relationship between the original alarm severity and the human perception of the alarm priority. Using this knowledge, we suggest a neural network-based approach for alarm prioritization. Tests using live data show that our prototype assigns the same severity as a human expert in 50% of all cases, compared to 17% for a na¨ıve approach. In order to model and monitor the services this thesis propose a novel domain specific language called SALmon, which allows for efficient representation of service models, together with a computational engine for evaluation of service models. We show that the proposed system is a good match against real-world scenarios with special requirements around service modeling.

Abstract [sv]

Två av de största problemen inom nätverksövervakning är:• överflöd av larm med dålig kvalitet• att förstå struktur och kvalitet på levererade tjänsterAvhandlingen föreslår lösningar inom larm- och tjänsteövervakning för storskaliga mobila nät med olika typer av tjänster. Arbetet med larm är baserat på en verklig larm- och ärendedatabas från en mobiloperatör. Vi har undersökt relationen mellan larmets ursprungliga prioritet och den prioritet som sätts av experter i ärendehanteringssystemet. Baserat på denna information föreslår vi en lösning för automatisk larmprioritering med hjälp av ett neuralt nätverk. Tester visar att vår prototyp sätter samma prioritet som en mänsklig expert i 50% av fallen jämfört med 17% för prioriteten som skickas i larmet.För att modellera och övervaka tjänster föreslår vi ett domänspecifikt språk, SALmon. SALmon gör det möjligt att uttrycka tjänstemodeller och även att beräkna status på dessa. Vi visar att lösningen matchar krav från mobila operatörer.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2009. p. 98
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords
Information technology - Telecommunication, Informationsteknik - Telekommunikation
National Category
Media and Communication Technology
Research subject
Mobile and Pervasive Computing
Identifiers
urn:nbn:se:ltu:diva-18231 (URN)7866c2a0-1f87-11de-81ae-000ea68e967b (Local ID)978-91-86233-34-1 (ISBN)7866c2a0-1f87-11de-81ae-000ea68e967b (Archive number)7866c2a0-1f87-11de-81ae-000ea68e967b (OAI)
Note
Godkänd; 2009; 20090402 (stewal); LICENTIATSEMINARIUM Ämnesområde: Mobila system Examinator: Docent Christer Åhlund, Luleå tekniska universitet Tid: Fredag den 22 maj 2009 kl 10.00 Plats: LTU Skellefteå A-hörsalen, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-10Bibliographically approved
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