Performance Analysis of QoS in LTE-Advanced Heterogeneous Networks
Author
Ruiz Grande, David
Term
4. term
Education
Publication year
2013
Abstract
Denne afhandling undersøger, hvordan kvalitet af service (QoS) kan sikres i LTE-Advanced heterogene netværk (HetNets), hvor makro- og småceller sameksisterer og skaber nye interferensudfordringer. Udgangspunktet er eICIC-baseret interferenskoordinering og celleudvidelse (Range Extension), som suppleres med nye og mere effektive styringsmekanismer. Projektet benytter systemniveau-simuleringer i Nokia Siemens Networks’ LTE-simulator med MATLAB til efterbehandling og evaluerer to topologier (makro–pico og makro–RRH). Der præsenteres og vurderes metoder til belastningsbalancering og hurtig tilpasning af Almost Blank Subframe (ABS) mutingsforhold, koordineret multi-celle planlægning samt en QoS-bevidst pakkeskedulering baseret på proportional fairness med en barrierefunktion for at beskytte Guaranteed Bit Rate (GBR)-brugere. Centrale nøgletal omfatter dækning, 5.- og 50.-percentil bruger-gennemstrømning, PRB-allokering, offloading og mutingsfordelinger. Ifølge de rapporterede simuleringer giver de foreslåede tiltag positive forbedringer i interferenshåndtering og håndtering af GBR-krav, og dynamiske strategier viser fordele over statiske opsætninger; detaljerede kvantitative resultater fremgår ikke af dette uddrag.
This thesis investigates how to ensure Quality of Service (QoS) in LTE-Advanced Heterogeneous Networks (HetNets), where coexisting macro and small cells introduce new interference challenges. Building on eICIC-based interference coordination and cell range extension, the work proposes more efficient control mechanisms. Using Nokia Siemens Networks’ LTE system-level simulator with MATLAB post-processing, two topologies (macro–pico and macro–RRH) are evaluated. The study introduces and assesses load balancing with fast adaptation of Almost Blank Subframe (ABS) muting ratios, coordinated multi-cell scheduling, and a QoS-aware packet scheduler based on proportional fairness with a barrier function to protect Guaranteed Bit Rate (GBR) users. Key performance indicators include coverage, 5th- and 50th-percentile user throughput, PRB allocation, offloading, and muting distributions. The reported simulations indicate positive improvements in interference management and fulfillment of GBR requirements, with dynamic strategies outperforming static configurations; detailed quantitative gains are not provided in this excerpt.
[This summary has been generated with the help of AI directly from the project (PDF)]
Keywords
Documents