Hello friend!
This parameter is a parameter whose ID is UeInactivityTimer.
Parameter Description
Indicates the length of the UE inactivity timer in which the gNodeB monitors whether a UE transmits and receives data. If the gNodeB detects that a UE has neither received nor sent data within the timer length, the gNodeB checks whether the RRC_INACTIVE state takes effect for the UE. If it does, the UE state is changed to RRC_INACTIVE. If it does not, the UE is released. If this parameter is set to 0, the gNodeB releases the UE if it does not receive or send data for 3600s.
Hope this helps!