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In 3GPP TS 45 005  [21], Table 6.3-1 in section 6.3, protection ratios are specified in dB for a desensitisation D_STANDARD of 20 dB (see section 6.1).

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Blocking Response    = I_IB-STANDARD - I_{OOB-STANDARD                                                                                                                                STANDARD}    (Eq. 135)

= (C - I_OOB-STANDARD) - (C - I_IB-STANDARD)                                                                      (Eq. 136)

                               = (C - Ia) - (C - Ic)

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I_OOB-TARGET = N + 10.log₁₀[10^(D_TARGET/10) - 1] + (C - Ic) - (C - Ia)                                                         (Eq. 137)

I_OOB-TARGET = N + I/N_TARGET + (C - Ic) - (C - Ia)                                                                                  (Eq. 138)