Table 3 Handover strategy: S-persistent
From: Seamless internet 3G and opportunistic WLAN vehicular connectivity
Tree-depth | DRSU (m) | Density | Time 3G (s) | Time WLAN (s) | Offload (%) | # Handoffs | Improvement (%) |
|---|---|---|---|---|---|---|---|
2 | 1000 | LO | 11.26 ± 0.08 | 29.25 ± 0.08 | 72.20 | 1.34 | 29.59 |
|  | 1000 | HI | 11.10 ± 0.09 | 32.87 ± 0.09 | 74.75 | 1 | 34.31 |
|  | 2000 | LO | 51.21 ± 0.09 | 30.65 ± 0.09 | 37.44 | 2.00 | 34.52 |
|  | 2000 | HI | 54.48 ± 0.09 | 35.61 ± 0.09 | 39.53 | 1.60 | 41.83 |
|  | 3000 | LO | 92.71 ±0.10 | 30.51 ± 0.10 | 24.76 | 1.86 | 33.84 |
|  | 3000 | HI | 100.03 ± 0.11 | 36.00 ± 0.11 | 26.46 | 1.58 | 42.43 |
3 | 1000 | LO | 10.86 ± 0.08 | 29.65 ± 0.08 | 73.20 | 1.32 | 31.38 |
|  | 1000 | HI | 11.02 ± 0.11 | 32.96 ± 0.11 | 74.95 | 1 | 34.65 |
|  | 2000 | LO | 44.78 ± 0.09 | 37.08 ± 0.09 | 45.29 | 3.41 | 62.74 |
|  | 2000 | HI | 45.01 ± 0.09 | 45.08 ± 0.09 | 50.04 | 2.52 | 79.55 |
|  | 3000 | LO | 86.47 ± 0.10 | 36.75 ± 0.10 | 29.82 | 3.51 | 61.21 |
|  | 3000 | HI | 90.32 ± 0.09 | 45.70 ± 0.09 | 33.60 | 2.65 | 80.83 |