QoS-aware centralized radio resource management for TDMA-based heterogeneous application scenarios
Author
Tamasauskaite, Ruta
Term
4. term
Education
Publication year
2020
Abstract
This thesis investigates how centralized radio resource management (RRM) can meet Quality of Service (QoS) requirements for many heterogeneous devices sharing a TDMA-based wireless link, while keeping user equipment simple by placing scheduling decisions at base stations. Grounded in an industrial use case from RTX A/S, we analyze system requirements and derive design options that we model and compare using Stochastic Timed Automata in the Uppaal tool. In collaboration with RTX engineers, we build realistic behavior templates for different device types. The mechanisms explored include two sleep-mode implementations for energy savings, a QoS-aware scheduler with profile-based priority queues and dynamic frame sizing, load balancing and handover across base stations, and strategy-based frame arrangement to mitigate synchronization issues in transmission preparation. We also propose a frame structure without a fixed split between transmission and retransmission subframes, reflecting continuous media streaming. Selected alternatives are compared through formal modeling and verification; detailed quantitative outcomes are not provided in this excerpt. The work contributes structured design options and model-based assessments to guide QoS-aware, centralized RRM in TDMA systems with diverse application demands.
Denne afhandling undersøger, hvordan centraliseret radioressourcestyring (RRM) kan opfylde Quality of Service (QoS)-krav for mange heterogene enheder, der deler en TDMA-baseret trådløs forbindelse, samtidig med at terminalerne holdes simple og beslutninger samles i basestationer. Med udgangspunkt i en industriel use case fra RTX A/S analyserer vi systemkrav og udleder designvalg, som vi modellerer og sammenligner ved hjælp af Stochastic Timed Automata i værktøjet Uppaal. I samarbejde med RTX-ingeniører udvikles realistiske adfærdsskabeloner for forskellige enhedstyper. De undersøgte mekanismer omfatter to implementeringer af sovetilstand for energibesparelse, en QoS-bevidst planlægger med profilbaserede prioriteringskøer og dynamisk ramme-størrelse, lastbalancering og handover mellem basestationer samt strategibaseret rammeplanlægning for at reducere synkroniseringsudfordringer i transmissionsforberedelsen. Vi foreslår desuden en rammestruktur uden fast opdeling mellem transmissions- og retransmissions-underframes, som afspejler kontinuerlig mediestreaming. Udvalgte alternativer sammenlignes gennem formel modellering og verifikation; detaljerede kvantitative resultater fremgår ikke af dette uddrag. Arbejdet bidrager med strukturerede designmuligheder og modelbaserede vurderinger, der kan vejlede QoS-bevidst, centraliseret RRM i TDMA-systemer med forskellige applikationsbehov.
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