Which of the following descriptions of carrier aggregation related concepts are correct?

• A.The secondary cell refers to a cell that is configured to the CA UE through RRC connection signaling and works on the secondary carrier to provide more radio resources for the CA UE. SCell only has downlink and no uplink
• B.The primary cell is the cell in which the CA UE resides, that is, the primary serving cell. The operation of the CA UE in this cell is no different from other R8/9 cells. Only the PCell has the PUCCH channel.
• C.PCC anchor point, which refers to the high priority resident PCC selected by the eNodeB
• D.Component carrier refers to the carrier corresponding to different cells participating in carrier aggregation

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Which of the following is not the main function of LTE Layer 2?

• A.Power control
• B.Scheduling
• C.ARQ
• D.Encryption

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What are the factors that affect the average throughput rate of the community? (Multiple Choice)

• A.Neighbor load: DLL load directly affects the flat throughput rate of the community
• B.The load of the cell: directly affects the number of RBs that can be used in the cell.
• C.System bandwidth: The different bandwidth of the system determines the total R positivity of the system.
• D.Data channel available bandwidth: The overhead of the common channel further determines the resources that the user can actually use.

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Which of the following channels can change the modulation mode during the scheduling process? (multiple choice)

• A.PUSCH
• B.PHICH
• C.PDCCH
• D.PUCCH
• E.PDSCH

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Which of the following factors does not belong to the "system unavailable due to system reasons"?

• A.Clock resources are not available
• B.RF unit transceiver channel failure
• C.MML operation occlusion cell
• D.CPRI link failure

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