A8.2.1 Case 1: No overlapAnchor A8.2 A8.2
Figure 384386: iRSS_blocking case 1: no overlapAnchor F384F386F384 F386
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where:
lower: offset - BWILT/2 – emission mask asymmetry[1]
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A8.2.2 Case 2: Partial overlap with fILT > fVLR
Figure 385387: iRSS_blocking case 2: partial overlap with fILT > fVLRAnchor F385F387F385 F387
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Note: the blue coloured range is covered by the iRSS_unwanted calculation and therefore not taken into account in the iRSS_blocking calculation.
where:
lower: BWVLR/2
upper: offset + BWILT/2 – emission mask asymmetry
dF: step size, e.g. min{0.1;( BWILT)/20}
A8.2.3 Case 3: Partial overlap with fILT < fVLR
Figure 386388: iRSS_blocking case 3: partial overlap with fILT < fVLRAnchor F386F388F386 F388
Note: the blue coloured range is covered by the iRSS_unwanted calculation and therefore not taken into account in the iRSS_blocking calculation.
where:
upper: - BWVLR/2
lower: – offset - BWILT/2 – emission mask asymmetry
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A8.2.4 Case 4: Total overlap with BWVLR < BWILT
Figure 387389: iRSS_blocking case 4: Total overlap with BWVLR < BWILTAnchor F387F389F387 F389
Note: the blue coloured range is covered by the iRSS_unwanted calculation and therefore not taken into account in the iRSS_blocking calculation.
where:
lower: offset - BWILT/2 – emission mask asymmetry
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excluding the range fVLR ± BWVLR/2
Note that at least 3 samples are required for the range fVLR ± BWVLR.
A8.2.5 Case 5: total overlap with BWVLR > BWILT
Figure 388390: iRSS_blocking case 5: total overlap with BWVLR > BWILTAnchor F388F390F388 F390
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In this case, there is no blocking as the interference is completely covered by the unwanted calculation. The blocking attenuation is therefore set to 1000 dB.
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The integral requires positive values of the blocking mask, i.e. the blocking mode has to be considered first.
where: n = range/dF and range = upper-lower
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maskValue(f) = BlockUD (dB).
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- For generic systems defined with blocking modes different to user-defined (i.e. sensitivity and protection ratio);
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- Protection Ratio (dB):
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maskValue(f) = BlockPR (dB) + C/(N+I) (dB) + (N+I)/N (dB) - I/N (dB)
- Sensitivity Mode (dBm):
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maskValue(f) = BlockSens (dBm) – SensitivityVLR (dBm) + C/(N+I) (dB) – I/N (dB)
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For a User Equipment: the bandwidth is: the number of RBs per MS (UE) multiplied by the bandwidth or one resource block.
Calculation of BW for CDMA
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- Standard desensitisation (for which the blocking mask values where derived);
- Target I/N (which depends on the scenario considered and can be extracted from the CEPT/ECC or ITU-R deliverables ).
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If the mask is entered as positive values then these parameters are not used.
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Figure 389391: Input parameters for cellular receivers blocking masksAnchor F389F391F389 F391
Default values of standard desensitisation and Target I/N are specified in the table below.
Table 6768: Default values of standard desensitisation and Target I/NAnchor T067T068T067 T068
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| Standard |
Desensitsation (dB) | Target I/N (dB) | |
OFDMA UL | +6 | -6 |
OFDMA DL | +6 | -6 |
CDMA UL | +6 | -6 |
CDMA DL | +3 | -6 |
The algorithm to convert negative blocking mask values is as follows:
Blocking Response = IOOB_target – Noise floor – I/Ntarget
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where:
- I/Ntargetis always understood as ‘target I/N of the victim’, which is calculated for D_target (target desensitisation)
- Noise floor = 10*log(kTB) + F.
- K= Boltzmann Constant
- T = Noise temperature (Kelvin)
- B = Receiver bandwidth in MHz
- F = Noise Figure (dB)
- IOOB_target is calculated as follows :
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IOOB-TARGET = IOOB-STANDARD – DSTANDARD + DTARGET
where:
- IOOB-STANDARD = is the original blocking mask;
- DSTANDARD = is the standard desensitisation for which the blocking mask values (IOOB-STANDARD) were derived. It is an input of cellular receiver settings (see Figure 389).
- DTARGET = 10*log10(10^(I/N_target/10)+1) ; where I/N_target is an input of cellular receiver settings.
Finally we obtain:
Blocking Response = IOOB-TARGET – Noise floor– I/Ntarget, which means:
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