2024年4月28日发(作者：)
Cause
Cause IE 表示S1AP 协议的特定事件的原因。
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IE/Group
Name
CHOICE
Cause
Group
>Radio
Network
Layer
>>Radio
Network
Layer
Cause
Presenc
e
M
Rang
e
IE Type and Reference Semantics
Descriptio
n
M ENUMERATED
(Unspecified,
TX2
RELOCOverall
Expiry,
Successful Handover,
Release due to E-UTRAN Generated Reason,
Handover Cancelled, Partial Handover,
Handover Failure In Target EPC/eNB Or
Target System,
Handover Target not allowed,
TS1
RELOCoverall
Expiry,
TS1
RELOCprep
Expiry,
Cell not available,,
Unknown Target ID,
No Radio Resources Available in Target Cell,
Unknown or already allocated MME UE S1AP
ID,
Unknown or already allocated eNB UE S1AP
ID,
Unknown or inconsistent pair of UE S1AP ID,
Handover desirable for radio reasons,
Time critical handover,
Resource optimisation handover,
Reduce load in serving cell, User inactivity,
Radio Connection With UE Lost, Load
Balancing TAU Required, CS Fallback
Triggered,
UE Not Available For PS Service, Radio
resources not available,
Failure in the Radio Interface Procedure,
Invalid QoS combination, Inter-RAT
redirection,
Interaction with other procedure, Unknown
E-RAB ID, Multiple E-RAB ID instances,
Encryption and/or integrity protection
algorithms not supported, S1 intra system
2
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