What is the importance of Hysteresis IE in ReportconfigEUTRA?

Question

I just found an IE AS Context which contains ReestablishmentInfo in Handover Preparation message ?

Can any one signify the importance of this IE ?

HandoverPreparationInformation-r8-IEs ::= SEQUENCE {
ue-RadioAccessCapabilityInfo UE-CapabilityRAT-ContainerList,
as-Config AS-Config OPTIONAL, -- Cond HO
rrm-Config RRM-Config OPTIONAL,
as-Context AS-Context OPTIONAL, -- Cond HO
nonCriticalExtension HandoverPreparationInformation-v920-IEs OPTIONAL
}

AS-Context ::= SEQUENCE {
reestablishmentInfo ReestablishmentInfo OPTIONAL -- Cond HO
}

ReestablishmentInfo ::= SEQUENCE {
sourcePhysCellId PhysCellId,
targetCellShortMAC-I ShortMAC-I,
additionalReestabInfoList AdditionalReestabInfoList OPTIONAL,
...
}

AdditionalReestabInfoList ::= SEQUENCE ( SIZE (1..maxReestabInfo) ) OF AdditionalReestabInfo

AdditionalReestabInfo ::= SEQUENCE{
cellIdentity CellIdentity,
key-eNodeB-Star Key-eNodeB-Star,
shortMAC-I ShortMAC-I
}

Answer 1

hysteresis value in the ReportConfigEUTRA is used in determining when to report the A1-5 event. Possible value could be 0-15db