Design of optimized mobility capabilities in future 5G systems
Authors
Stefan, Maria ; Cascino, Maria Carmela
Term
4. term
Education
Publication year
2015
Submitted on
2015-06-03
Pages
91
Abstract
Dette speciale undersøger, hvordan mobilitet kan optimeres i fremtidige 5G-systemer, så høje datahastigheder kan leveres selv ved høj kørehastighed. Arbejdet tager udgangspunkt i den nuværende LTE-teknologi og kombinerer feltmålinger i Aalborg ved lav hastighed (ca. 15 km/t) og på motorvej ved høj hastighed (ca. 100 km/t) med simulerede scenarier for at validere modeller og benchmarke ydeevnen. På denne baggrund vurderes LTE’s evne til at imødekomme den forventede, kraftige trafikvækst, og resultaterne indikerer, at LTE alene ikke kan understøtte en tusindfold stigning i datahastighed. Derfor udforskes en lagdelt 5G-udrulning bestående af makroceller (LTE) suppleret med tæt placerede småceller på højere frekvenser og med stor båndbredde, hvor mobilitet håndteres via dual connectivity mellem LTE og 5G samt ved brug af carrier aggregation. Evalueringen bygger på centrale radioparametre (RSRP, RSRQ, RSSI), gennemløb (throughput) og hændelser som radio- og handover-fejl. Simulationerne viser, at den valgte time-to-trigger har stor betydning for mobilitetsydelsen, og at høj tilslutning til 5G-småceller forbedrer den oplevede gennemløb for brugerne i det testede scenarie.
This thesis examines how to optimize mobility in future 5G systems to deliver high data rates even at high user speeds. The study starts from today’s LTE technology and combines field measurements in Aalborg at low speed (about 15 km/h) and highway speed (about 100 km/h) with simulated LTE scenarios to validate the modeling and establish a baseline. Based on these results, LTE’s ability to meet the anticipated surge in traffic is assessed, and findings indicate that LTE alone cannot support a thousandfold increase in data rate. Consequently, a layered 5G deployment is explored, with LTE macrocells complemented by ultra-dense small cells at higher carrier frequencies and wide bandwidth, using dual connectivity between LTE and 5G and carrier aggregation to enhance capacity. The evaluation relies on key radio metrics (RSRP, RSRQ, RSSI), user throughput, and mobility events such as radio and handover failures. Simulations show that the time-to-trigger parameter strongly affects mobility performance, and that maintaining strong connectivity to 5G small cells improves the user-experienced throughput in the studied scenario.
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