Table 2 Simulation parameters
From: Self-tuning of scheduling parameters for balancing the quality of experience among services in LTE
Cellular layout | Hexagonal grid |
57 cells (3 × 19 sites) | |
Transmission direction | Downlink |
Carrier frequency | 2.0 GHz |
System bandwidth | 1.4 MHz (6 PRBs) |
Cell radius | 0.5 km |
Inter-site distance | 1.5 km |
Propagation model | Okumura-Hata with wrap around |
Log-normal slow fading, σ=8 dB, correlation distance = 20 m | |
Multipath fading, ETU model | |
Mobility model | Random direction, constant speed, 3 km/h |
Service model | VoIP: GBR, Poisson arrivals, mean call duration: 60 s |
VIDEO: non-GBR, Poisson arrivals, buffered video, H.264, real traces (http: //trace.eas.asu.edu/tracemain.html) | |
FTP: non-GBR, Poisson arrivals, mean file size: 2 MB [35] | |
WEB : non-GBR, Poisson arrivals, mean web page size/waiting time [35] | |
Base station model | Tri-sectorized antenna, MIMO 2 × 2, EIRP max=43 dBm |
Scheduler | EXP/PF multi-service modified with SPI parameter |
Power control | Equal transmit power per PRB |
Link adaptation | CQI based |
RRM features | Handover, call access control |
HO parameter settings | TimetoTrigger = 100 ms |
HO margin = 3 dB | |
User distribution | Uniform spatial distribution |
Dropped call model | Radiolinktimeout = 1 s |
Time resolution | 10 TTI (10 ms) |
Simulated network time | 2 h (24 optimization loops * 5 min per loop = 120 min) |