As an example of a BS spectrum emission masks (i.e. CDMA DL as interferer), TS 25.104 [1] have shown that different values may need to be considered depending on the BS maximum output power Table 64 presents Spectrum emission mask values, BS maximum output power P ³ 43 dBm.
Table 64: Spectrum emission mask values, BS maximum output power P ³ 43 dBm (from [1])
Frequency offset of measurement filter ‑3dB point, Df | Frequency offset of measurement filter centre frequency, f_offset | Minimum requirement Band I, II, III, IV, V, VII, VIII, X | Additional requirements Band II, IV, V, X | Measurement bandwidth |
2.5 MHz <= Df < 2.7 MHz | 2.515MHz <= f_offset < 2.715MHz | -14 dBm | -15 dBm | 30 kHz |
2.7 MHz <= Df < 3.5 MHz | 2.715MHz <= f_offset < 3.515MHz |  | -15 dBm | 30 kHz |
(see note 3) | 3.515MHz <= f_offset < 4.0MHz | -26 dBm | NA | 30 kHz |
3.5 MHz <= Df <= Dfmax | 4.0MHz <= f_offset < f_offsetmax | -13 dBm | -13 dBm 4 | 1 MHz |
Assuming a BS Tx power of 43 dBm, the equation of Table 65 gives the SEAMCAT input as presented in XXX and as illustrated in Figure 380.
Note that for this example, we add the limit from Recommendation ITU-R SM.329 for frequency offset above 12.5 MHz [2].
Table 65: Example of derivation of 3GPP spectrum emission mask into a SEAMCAT input format (with addition of the ITU-R Rec. SM.329 limit)
Frequency offset of measurement filter ‑3dB point, Df | Minimum requirement Band VIII | SEAMCAT (in ref/measurement bandwidth) | Measurement bandwidth |
2.5 MHz <= Df < 2.7 MHz | -14 dBm | 43 – (-14) = 57 | 30 kHz |
2.7 MHz <= Df < 3.5 MHz |  | Linear | 30 kHz |
(see note 3) | -26 dBm | 43 – (-26) = 69 | 30 kHz |
3.5 MHz £ Df <= Dfmax | -13 dBm | 43 – (-13) = 56 | 1 MHz |
Above 12.5 MHz (ITU-R SM.329) | -36 dBm | 43 – (-36) = 79 | 100 kHz |
Figure 380: Illustration of the spectrum emission mask at the BS used in SEAMCAT and its derivation from the 3GPP specification and ITU-R SM.329 (for frequency offset larger than 12.5 MHz within the spurious emission domain in the frequency range 30 to 1000 MHz).