NgSig建立成功是指基站向AMF发送INITIAL UE MESSAGE后，AMF是否有向gNodeB下发以下哪几条命令？
AINITEAL CONTEXT SETUP REQUEST
BDOWNLINK NAS TRANSPORT
Cinitial Context Setup Response
DUE CONTEXT RSLEASE COMMAND
AINITEAL CONTEXT SETUP REQUEST
BDOWNLINK NAS TRANSPORT
Cinitial Context Setup Response
DUE CONTEXT RSLEASE COMMAND