System Description

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Issued Date
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Feb. 14, 2020
Form version: 181113
FCC SAR TEST REPORT
Report No. : FA9O2119
14. WWAN OFF & WWAN ON WLAN Conducted Power
General Note:
1. For each antenna, transmit power in SISO operation is larger than (or equal to) the power in MIMO operation, RF exposure
compliance of MIMO mode can be deduced from the compliance simultaneous transmission of antennas operating in SISO mode.
2. Per KDB 248227 D01v02r02, the simultaneous SAR provisions in KDB publication 447498 should be applied to determine
simultaneous transmission SAR test exclusion for WiFi MIMO. If the sum of 1g single transmission chain SAR measurements is <
1.6W/kg and SAR peak to location ratio ≤ 0.04, no additional SAR measurements for MIMO.
3. Per KDB 248227 D01v02r02, SAR test reduction is determined according to 802.11 transmission mode configurations and certain
exposure conditions with multiple test positions. In the 2.4 GHz band, separate SAR procedures are applied to DSSS and OFDM
configurations to simplify DSSS test requirements. For OFDM, in both 2.4 and 5 GHz bands, an initial test configuration must be
determined for each standalone and aggregated frequency band, according to the transmission mode configuration with the
highest maximum output power specified for production units to perform SAR measurements. If the same highest maximum output
power applies to different combinations of channel bandwidths, modulations and data rates, additional procedures are applied to
determine which test configurations require SAR measurement. When applicable, an initial test position may be applied to reduce
the number of SAR measurements required for next to the ear, UMPC mini-tablet or hotspot mode configurations with multiple test
positions.
4. For 2.4 GHz 802.11b DSSS, either the initial test position procedure for multiple exposure test positions or the DSSS procedure for
fixed exposure position is applied; these are mutually exclusive. For 2.4 GHz and 5 GHz OFDM configurations, the initial test
configuration is applied to measure SAR using either the initial test position procedure for multiple exposure test position
configurations or the initial test configuration procedures for fixed exposure test conditions. Based on the reported SAR of the
measured configurations and maximum output power of the transmission mode configurations that are not included in the initial
test configuration, the subsequent test configuration and initial test position procedures are applied to determine if SAR
measurements are required for the remaining OFDM transmission configurations. In general, the number of test channels that
require SAR measurement is minimized based on maximum output power measured for the test sample(s).
5. For OFDM transmission configurations in the 2.4 GHz and 5 GHz bands, When the same maximum power is specified for multiple
transmission modes in a frequency band, the largest channel bandwidth, lowest order modulation, lowest data rate and lowest
order 802.11a/g/n/ac mode is used for SAR measurement, on the highest measured output power channel for each frequency
band.
6. DSSS and OFDM configurations are considered separately according to the required SAR procedures. SAR is measured in the
initial test position using the 802.11 transmission mode configuration required by the DSSS procedure or initial test configuration
and subsequent test configuration(s) according to the OFDM procedures.18 The initial test position procedure is described in the
following:
a. When the reported SAR of the initial test position is ≤ 0.4 W/kg, further SAR measurement is not required for the other test
positions in that exposure configuration and 802.11 transmission mode combinations within the frequency band or
aggregated band.
b. When the reported SAR of the test position is > 0.4 W/kg, SAR is repeated for the 802.11 transmission mode configuration
tested in the initial test position to measure the subsequent next closet/smallest test separation distance and maximum
coupling test position on the highest maximum output power channel, until the report SAR is ≤ 0.8 W/kg or all required test
position are tested.
c. For all positions/configurations, when the reported SAR is > 0.8 W/kg, SAR is measured for these test
positions/configurations on the subsequent next highest measured output power channel(s) until the reported SAR is ≤ 1.2
W/kg or all required channels are tested.