Panitzek, Kamill (2014)
Mobile Service Provision in Harsh Environments.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
Envision the future disaster recovery worker relying on mobile devices to work in a disaster setting. This recovery worker requires and benefits from a great number of provided services, for instance, to navigate, communicate, and map the environment. However, he faces adverse networking and computing conditions, characterized by the obstructed or destroyed geographical region, the overloaded or destroyed communication infrastructure, and the density and movement of involved recovery workers. We call such surroundings harsh environments.
The present thesis strives to enable recovery workers to consume versatile (cloud) services on top of a resilient communication infrastructure. A service is a software component, i.e., an application, that provides a distinct functionality to accessing users. Thereby, three key challenges have to be faced that also define the three fields of research: (1) improving the resilience of the communication infrastructure, (2) designing a system capable of service provision, and (3) conceiving detailed simulation models and tools to investigate such systems in harsh environments. In each field of research, we contribute and evaluate novel approaches that work together to achieve the main goal of this thesis: mobile service provision in harsh environments.
First, we contribute CityMesh, a resilient emergency communication infrastructure created by interconnecting wireless routers from private households and public institutions found in urban areas. The resulting decentralized mesh network is based on the IEEE 802.11 WLAN standard and outperforms the existing TETRA standard in terms of data throughput, openness, and failure resilience. Furthermore, we present our research methodology to evaluate the feasibility of our concept by collecting data about wireless routers, enhancing the data accuracy using multilateration, and constructing and analyzing CityMesh networks. We show that network topologies in five selected cities rely on router locations specific to the respective city. Furthermore, we demonstrate that private routers are crucial to create a resilient CityMesh network. To realize the CityMesh concept, we propose to install an emergency switch into wireless routers. This switch could be triggered by eligible authorities in case of a disaster.
Second, we present the core contribution of our thesis: the peer-to-peer service overlay concept that fulfills the requirements of harsh environments. To ensure high quality service consumption, the most crucial system components are service discovery (enables service consumers to access a requested service) and service placement (relocates a service in the network topology to increase service quality). Based on simulations, we demonstrate that our conceived hop count placement approach outperforms the state of the art placement approach in terms of consistent service quality for all service consumers. Furthermore, we show that latency is not a suitable quality metric for service placement. We also demonstrate that three state of the art service discovery approaches designed for mobile ad-hoc networks are not capable of handling service mobility introduced by service placement. Moreover, a naive request flooding approach performs best in terms of discovery performance and data traffic efficiency when exposed to peer mobility and frequent service migrations. Finally, we present our real-world experiment setup PeerMoS and contribute four concepts for smooth and efficient service migration.
Third, we contribute our integrated simulation framework DisVis to investigate the effectiveness of communication systems in realistic harsh environments. Especially in disaster recovery scenarios, the movement of recovery workers depends on the terrain, the current disaster situation, the mission strategy of respective recovery workers, and the orders received from the command centers. Hence, DisVis builds upon an OpenStreetMap-based world model and a fine-grained agent-based mobility and communication model. We adjust the rule sets and parameters of our models with results from our survey targeted at experts from first response departments. As opposed to other state of the art mobility simulators, DisVis provides an online interface to connect our framework with state of the art network simulators, such as PeerfactSim.KOM.
| Typ des Eintrags: | Dissertation | ||||
|---|---|---|---|---|---|
| Erschienen: | 2014 | ||||
| Autor(en): | Panitzek, Kamill | ||||
| Art des Eintrags: | Erstveröffentlichung | ||||
| Titel: | Mobile Service Provision in Harsh Environments | ||||
| Sprache: | Englisch | ||||
| Referenten: | Mühlhäuser, Prof. Max ; Kangasharju, Prof. Jussi | ||||
| Publikationsjahr: | 2014 | ||||
| Datum der mündlichen Prüfung: | 3 September 2014 | ||||
| URL / URN: | http://tuprints.ulb.tu-darmstadt.de/4158 | ||||
| Kurzbeschreibung (Abstract): | Envision the future disaster recovery worker relying on mobile devices to work in a disaster setting. This recovery worker requires and benefits from a great number of provided services, for instance, to navigate, communicate, and map the environment. However, he faces adverse networking and computing conditions, characterized by the obstructed or destroyed geographical region, the overloaded or destroyed communication infrastructure, and the density and movement of involved recovery workers. We call such surroundings harsh environments. The present thesis strives to enable recovery workers to consume versatile (cloud) services on top of a resilient communication infrastructure. A service is a software component, i.e., an application, that provides a distinct functionality to accessing users. Thereby, three key challenges have to be faced that also define the three fields of research: (1) improving the resilience of the communication infrastructure, (2) designing a system capable of service provision, and (3) conceiving detailed simulation models and tools to investigate such systems in harsh environments. In each field of research, we contribute and evaluate novel approaches that work together to achieve the main goal of this thesis: mobile service provision in harsh environments. First, we contribute CityMesh, a resilient emergency communication infrastructure created by interconnecting wireless routers from private households and public institutions found in urban areas. The resulting decentralized mesh network is based on the IEEE 802.11 WLAN standard and outperforms the existing TETRA standard in terms of data throughput, openness, and failure resilience. Furthermore, we present our research methodology to evaluate the feasibility of our concept by collecting data about wireless routers, enhancing the data accuracy using multilateration, and constructing and analyzing CityMesh networks. We show that network topologies in five selected cities rely on router locations specific to the respective city. Furthermore, we demonstrate that private routers are crucial to create a resilient CityMesh network. To realize the CityMesh concept, we propose to install an emergency switch into wireless routers. This switch could be triggered by eligible authorities in case of a disaster. Second, we present the core contribution of our thesis: the peer-to-peer service overlay concept that fulfills the requirements of harsh environments. To ensure high quality service consumption, the most crucial system components are service discovery (enables service consumers to access a requested service) and service placement (relocates a service in the network topology to increase service quality). Based on simulations, we demonstrate that our conceived hop count placement approach outperforms the state of the art placement approach in terms of consistent service quality for all service consumers. Furthermore, we show that latency is not a suitable quality metric for service placement. We also demonstrate that three state of the art service discovery approaches designed for mobile ad-hoc networks are not capable of handling service mobility introduced by service placement. Moreover, a naive request flooding approach performs best in terms of discovery performance and data traffic efficiency when exposed to peer mobility and frequent service migrations. Finally, we present our real-world experiment setup PeerMoS and contribute four concepts for smooth and efficient service migration. Third, we contribute our integrated simulation framework DisVis to investigate the effectiveness of communication systems in realistic harsh environments. Especially in disaster recovery scenarios, the movement of recovery workers depends on the terrain, the current disaster situation, the mission strategy of respective recovery workers, and the orders received from the command centers. Hence, DisVis builds upon an OpenStreetMap-based world model and a fine-grained agent-based mobility and communication model. We adjust the rule sets and parameters of our models with results from our survey targeted at experts from first response departments. As opposed to other state of the art mobility simulators, DisVis provides an online interface to connect our framework with state of the art network simulators, such as PeerfactSim.KOM. |
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| URN: | urn:nbn:de:tuda-tuprints-41580 | ||||
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 000 Allgemeines, Informatik, Informationswissenschaft > 004 Informatik | ||||
| Fachbereich(e)/-gebiet(e): | 20 Fachbereich Informatik 20 Fachbereich Informatik > Telekooperation DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1053: MAKI – Multi-Mechanismen-Adaption für das künftige Internet DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1053: MAKI – Multi-Mechanismen-Adaption für das künftige Internet > B: Adaptionsmechanismen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1053: MAKI – Multi-Mechanismen-Adaption für das künftige Internet > B: Adaptionsmechanismen > Teilprojekt B2: Koordination und Ausführung |
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| Hinterlegungsdatum: | 05 Okt 2014 19:55 | ||||
| Letzte Änderung: | 10 Feb 2023 08:44 | ||||
| PPN: | |||||
| Referenten: | Mühlhäuser, Prof. Max ; Kangasharju, Prof. Jussi | ||||
| Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 3 September 2014 | ||||
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