9.2.145 Lower Layer presence status change

36.4233GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 Application Protocol (X2AP)

This IE is used to indicate that lower layer resources’ presence status shall be changed. If the presence status is set to "release lower layers" or "suspend lower layers", PDCP entities, X2-U bearer resources, S1-U bearer resources and UE context information shall be kept.

IE/Group Name	Presence	Range	IE type and reference	Semantics description
Lower Layer presence status change	M		ENUMERATED (release lower layers, re-establish lower layers, suspend lower layers, resume lower layers …)	"re-establish lower layers" shall be only set after "release lower layers" has been indicated. "resume lower layers" shall restore SCG. "resume lower layers" shall be only set after "suspend lower layers" has been indicated.