Godkända
A coordinated optimization algorithm of inter-RAT handover thresholds and time-to-trigger in self-organizing networks
Jiasheng Liang (2010)
Start
2012-01-16
Presentation
2012-03-12 13:15
Plats:
E:3139
Avslutat:
2014-03-13
Examensrapport:
Sammanfattning
The limited coverage of Long Term Evolution (LTE) system results in many inter-radio access technology (RAT) handovers from LTE to legacy second generation (2G) or third generation (3G) mobile system and vice versa. Trouble-free operation of inter-RAT handovers requires the optimization of the handover parameters of different RATs. Currently, the handover parameters are optimized manually and it requires human intervention and increases operational expenditures (OPEX). To reduce costs and achieve an improved network performance, a self-optimizing algorithm for the inter-RAT handover parameters is foreseen in upcoming Self-Organizing Networks (SON) standards. The parameters affecting the inter-RAT handovers are mainly signal strength (or quality) thresholds and a timer called Time-to-Trigger (TTT). This thesis continues by further exploring the optimization of TTT using a coordinated approach with handover thresholds on the basis of the existing inter-RAT mobility robustness optimization (MRO) algorithm. Evaluations are performed by different parameter coordination paradigms which present the best inter-RAT handover performance on various User Equipment (UE) speeds.
Handledare: Ahmad Awada (Nokia Siemens Networks)
Examinator: Ove Edfors (EIT)