Frequency Reuse and C/I

C/I Ratio : ( 13 dB for GSM)

C (Carrier power) : 1/Rx

I (Interference power) : 1/(D-R)x

x : propagation coefficient (3~4 for most environments)

C/I Ratio = (1/Rx) / (1/(D-R)x) = (D/R -1) x

cells per cluster C/I Ratio(dB)

x=3.0 x=3.5 x=4.0

4 11.7 13.7 15.6

7 16.6 19.4 22.2

9 18.7 21.8 24.9

12 21.0 24.5 28.0

21 25.2 29.4 33.6

NOTE :

• C/I Ratio : ~18 dB for analog cellular

~14 dB for digital cellular using TDMA

~7 dB for digital cellular using CDMA

載波對干擾比(Carrier-To-Interference Ratio) :一種廣為採用 的通話品質量測方法

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