Which of the following are the main functions of the X2 interface? (Multiple choice)

• A.UE in ECM-CONNECTED state mobility within system support the context transfers from the source eNB to the target eNB
• B.E-RAB business management function
• C.Switching with 3GPP systems
• D.Inter-cell load management

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For the same frequency switching scenario, which of the following parameters has little effect on the handover?

• A.0cn
• B.0cs
• C.0fn
• D.Hys

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Which of the following channels can change the modulation mode during the scheduling process?

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

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Which of the following descriptions about the LAA technical is wrong?

• A.Unlicensed spectrum resources are centrally scheduled and allocated by the base station
• B.Authorized spectrum as the primary carrier
• C.RLC layer controls activation of unlicensed spectrum
• D.Improve network capacity

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The attach type initiated by VoLTE user is EPS-attach, and the attach type initiated by CSFB user is combined attach.

• A.True
• B.False

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