Research Article
Vertical Handover Decision Algorithm Using Ants’ Colonies for 4G Heterogeneous Wireless Networks
Table 1
Parameters used in the performance evaluation.
| Parameter | Symbol | Value |
| WLAN radius | | 150 m | Handover delay from cellular network to WLAN | | 2 S | Handover delay from WLAN to cellular network | | 2 S | Tolerable handover failure probability | | 0.005 | Tolerable unnecessary handover probability | | 0.005 | Pheromone evaporation rate | |
0.85 | Number of parameters | | 5 | Archive solution size | | From 10 to 100 | Number of MTs | | From 10 to 100 | Factor of high importance level | | 0.8 | Factor of medium importance level | | 0.4 | Factor of low importance level | | 0.2 | Number of high importance levels designated by the user | | 2 (bandwidth, monetary cost) | Number of medium importance levels designated by the user | | 2 (security, RSS) | Number of nonimportance levels designated by the user | | 1 (power consumption) |
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