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
• D.Limited mmWave coverage

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The 4G network can also well support services such as remote B-ultrasound and remote first aid. (True or False, 2 points)

• A.False
• B.True

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Which of the following key technologies is used to improve data transmission reliability and reduce retransmission caused by data transmission errors, Thereby indirectly improving spectral efficiency? _SC

• A.Channel codding
• B.Massive MIMO
• C.F-OFDMA //
• D.High-order modulation

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Which of the following is the interface between SMF and UPF? (single-choice question, 4 points)

• A.N4
• B.N2
• C.N1
• D.X2

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The smart meter reading business has higher requirements on which of the following indicators? (single-choice question, 2 points)

• A.Network bandwidth
• B.Network Latency
• C.Number of Terminal Connections
• D.Network Quality

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