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LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
515
User Manual 1173.9628.02 ─ 16
Fig. 3-17: OBW limit setting for 1.4 MHz BW
With carrier aggregation, it can be set per channel bandwidth combination.
Fig. 3-18: OBW limit setting for 20 MHz + 10 MHz
Characteristics
Refer to 3GPP TS 36.521 V10.3.0, section... Specified limit
Occupied Bandwidth (OBW)
6.6.1 Occupied bandwidth
< channel bandwidth
6.6.1A Occupied bandwidth for CA
< aggregated channel
bandwidth
3.2.5.9
Spectrum Emission Mask
The energy, that spills outside the designated radio channel, increases the interference
with adjacent channels and decreases the system capacity. The amount of unwanted
off-carrier energy is assessed by the out-of-band emissions (excluding spurious emis-
sions) that are specified in terms of the spectrum emission mask and the Adjacent
Channel Leakage power Ratio (ACLR).
3GPP specifies a general spectrum emission mask and several additional spectrum
emission masks. Which of the emission masks is applicable, depends on the parame-
ter
. The masks differ for signals with and without carrier
aggregation.
Both the general requirements and the additional requirements can be defined in the
configuration dialog, depending on the channel bandwidth / the channel bandwidth
combination. The information displayed above the general limits indicates whether the
general limits are applicable, or which set of additional limits applies instead.
The following figure shows the general limits for a signal without carrier aggregation
and a channel bandwidth of 1.4 MHz. For each emission mask area, you can define
the borders, set an upper power limit and select the resolution bandwidth to be used.
Additional limits and limits for other channel bandwidths are configured in the same
way.
The start and stop frequencies of each emission mask area are defined relative to the
edge of the assigned channel bandwidth. For carrier aggregation, they are defined rel-
ative to the edge of the assigned aggregated channel bandwidth.
Example:
Assume 0 MHz as start frequency and 1 MHz as stop frequency for a channel band-
width of 1.4 MHz. The resulting area ranges from +0.7 MHz to +1.7 MHz relative to the
carrier frequency. As all ranges are symmetrical, it ranges also from -0.7 MHz to -1.7
MHz relative to the carrier frequency.
General Description
深圳德标仪器
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