2024年4月29日发(作者：)

Cause

Cause IE 表示S1AP 协议的特定事件的原因。

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