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The 1.8GHz uplink frequency spectrum and the C-band downlink frequency band are used for uplink and downlink decoupling to solve the coverage problem. Which of the following descriptions is correct?

The 1.8GHz uplink frequency spectrum and the C-band downlink frequency band are used for uplink and downlink decoupling to solve the coverage problem. Which of the following descriptions is correct?
A . The UE only performs uplink transmission at 1.8GHz
B . UE needs to switch transmission between 1.8GHz and C-band
C . Uplink and downlink decoupling can only be used in NSA networking
D . Uplink and downlink decoupling can only be used in SA networking

Answer: B

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