Wireless Coverage in the public transportation system
Author
Andersen, Jesper Nysted
Term
4. term
Education
Publication year
2015
Submitted on
2015-06-03
Pages
58
Abstract
This thesis examines mobile coverage along the Danish railway network to understand why passengers often experience poor connectivity on trains. It is motivated by a long-standing debate between the rail operator and mobile carriers over whether coverage gaps are mainly caused by base-station placement along tracks or by the train’s structure attenuating radio signals. The study frames this as its central research question and develops a link budget-based understanding of coverage, covering propagation, penetration loss, and antenna characteristics. It compares several propagation models (including a simplified path-loss model, Hata, and 3GPP Rural Macro) and applies them in simulations of received power along railway corridors using base-station sectoring and geometry. A measurement campaign relates outdoor and in-car signal levels to estimate penetration loss into train carriages, including the effect of incidence angle. Together, the work provides an initial map of expected coverage and an empirical estimate of train penetration loss to assess whether base-station siting or carriage attenuation dominates; specific numerical results and final weighting are not included in this excerpt.
Denne afhandling undersøger mobil dækning i det danske jernbanenet for at forstå, hvorfor togpassagerer ofte oplever dårlig forbindelse. Udgangspunktet er en mangeårig debat mellem togselskaber og mobiloperatører om, hvorvidt problemet primært skyldes basestationers placering langs banen eller togets konstruktion, der dæmper radiosignaler. Projektet formulerer dette som hovedspørgsmålet og bygger en grundlæggende forståelse af mobil dækning via en link budget-tilgang, herunder gennemgang af udbredelse, penetrationstab og antenneforhold. Der sammenlignes flere udbredelsesmodeller (bl.a. en forenklet path loss-model, Hata og 3GPP Rural Macro), som anvendes i simuleringer af modtaget effekt langs jernbanestrækninger baseret på basestationers sektorering og geometri. Dertil gennemføres målinger, som relaterer signalniveauer udenfor og inden i toget for at estimere indtrængningstabet i togvogne, herunder effekten af indfaldsvinkel. Tilsammen giver arbejdet et første kort over forventet dækning og et empirisk estimat af togpeneterationstab, der kan bruges til at vurdere, om basestationsplacering eller vognkasse-dæmpning dominerer; konkrete tal og endelige vægtninger fremgår dog ikke af dette uddrag.
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