Which of the following are the reasons why 5G uses C-Band as the main frequency band? (Multiple choice, 2 points)
A.
Although the coverage effect of intermediate frequency is worse than that of low frequency, combined with CRS FREE and mMIMO, the downlink coverage is not a problem
B.
There is a big gap between the uplink coverage of 3.5GHz band and 1.8G
C.
The low frequency is occupied more, and the idle spectrum is very fragmented
Question analysis: C-Band is mainly used because low-frequency resources are already occupied and idle resources are scattered; although the coverage effect of intermediate frequency is worse than that of low frequency, combined with CRS FREE and mMIMO, downlink coverage is not a problem; mmWave coverage is limited.
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