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Why Rxlev in -dBm

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    As to the GSM1800 system::
    PL(dB) =32.45+20lg(1800)+20lgd(km)= 97.5+20lgd(km)
    D 1m 10m 20m 25m 30m 35m 40m
    Ls 37 57 63 65 67 68 69

    For In-building signal, GrenTech experienced Formula is as follow:
    L=LD+10LgD (m) + FAF

    Here, the FAF means the loss led by the internal obstruction; the experienced value is as follow
    FAF 900MHz 1800MHz
    Wood Board 5~6Db 6~8dB
    Glass 7~8dB 8~10dB
    Brick Wall 10~12dB 14~16dB
    Concrete Wall 15-20dB 20-25dB
    Elevators 30-40dB 35-40dB

    The output power of the antennas for GSM1800 P0=10dBm
    The gain of omni antenna G0=3dBi, the FAF of the wall is about 20dB,
    L (20m) =63+10lgD (m) +FAF

    So the RSSI=P0+G0-L=10+3-96=-83 (dBm)

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