BS | corridor |
|
corridor
Figure 3.6.12 Maximizing Line of Sight
Fading
Fading refers to the attenuation caused when a signal is reflected and receiving antenna receives multiple instances of the signal. A direct signal is always stronger than a reflected signal.
Base station is designed with two antennas and the capacity to choose the best suited antenna for carrying the strongest signal. This design minimizes chances of fading.
Although signals can travel around corners, you should place base stations so that signals begin their paths with a clear line of sight as illustrated in Figure 3.6.12 and then bend to travel to a receiving antenna. It limits the effect of signal fading.
Shadowing of the radio signal
The following items may well cause shadowing of the radio signal:
zThickness of walls, especially cavity walls and reinforced concrete walls.
zWindows or glass in doors with steel wire reinforcement or metallic reflection film.
zSteel doors, lift shafts, partitions or walls.
zFire resistant doors
zA wall of steel cabinets, large computer equipment or machinery.
zThickness of concrete floors.
Traffic Guidelines
Each base station supports four simultaneous calls, but because all users are not simultaneously in call statistically, a base station can support a greater number of wireless terminal users in practice.
Number of Cell | Recommended Number | Number of maximum | |
(Base station) | of Registered Wireless | Simultaneous Wireless | |
Terminals | Conversation | ||
| |||
1 |
| 4 | |
2 | 20 | 8 | |
3 |
| 12 | |
|
|
|
[Table 3.6.3] Suitable Wireless Terminal Number according to Base Station Number
50
