Cause
Cause IE 表示S1AP 协议的特定事件的原因。
IE/Group Name
Presence
Range
IE Type and Reference
Semantics Description
CHOICE Cause Group
M
>Radio Network Layer
>>Radio Network Layer Cause
M
ENUMERATED
(Unspecified,
TX2RELOCOverall 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,
TS1RELOCoverall Expiry,
TS1RELOCprep 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 Handover triggered, S1 inter system Handover triggered, X2 Handover triggered
…, Redirection towards 1xRTT,
Not supported QCI value)
>Transport Layer
>>Transport Layer Cause
M
ENUMERATED
(Transport Resource Unavailable,
Unspecified,
...)
  > NAS
>> NAS Cause
M
ENUMERATED (Normal Release,
Authentication failure,
Detach,
Unspecified,
…)
>Protocol
>>Protocol Cause
M
ENUMERATED
(Transfer Syntax Error,
Abstract Syntax Error (Reject),
Abstract Syntax Error (Ignore and Notify),
Message not Compatible with Receiver State,
Semantic Error,
Abstract Syntax Error (Falsely Constructed Message), Unspecified,...)
>Misc
>>Miscellaneous Cause
M
ENUMERATED
(Control Processing Overload, Not enough User Plane Processing Resources,
Hardware Failure,
O&M Intervention,
Unspecified, Unknown PLMN, ...)
不同原因值的解释在如下表格中有描述。一般而言, "not supported" 原因值表示没有相关的性能支持。另外, "not available" 原因值表示有相关的性能支持,但是没有充裕可用的资源来执行所请求的动作。
无线网络层原因
解释
Unspecifiedreference group
当没有具体的原因值的情况下发送的无线网络层原因
TX2RELOCOverall Expiry
监护切换的定时器在X2接口上已经异常逾时了
Successful Handover
成功切换
Release due to E-UTRAN generated reason
由于E-UTRAN 产生的原因发起了释放
Handover Cancelled
该动作的原因是切换的取消
Partial Handover
为切换取消提供一个原因。来自MME HANDOVER COMMAND 消息包含E-RABs to Release List IE,以及源eNB通过不继续向其特定的目标eNB进行切换,评估该UE的服务连续性会更好
Handover Failure In Target EPC/eNB Or Target System
切换失败是由于目标EPC/eNB 或目标系统中的失败
Handover Target not allowed
不允许怀疑的UE切换到指示的目标小区
TS1RELOCoverall Expiry
该动作的原因是由于定时器TS1RELOCoverall.的逾时
TS1RELOCprep Expiry
当定时器TS1RELOCprep 逾时时,取消切换准备过程
Cell not available
相应的小区不可用
Unknown Target ID
切换被拒绝是因为EPC对目标ID是未知的
No radio resources available in target cell
目标小区负载过高
Unknown or already allocated MME UE S1AP ID
该动作失败是由于MME UE S1AP ID要么是未知的,要么(eNB接收的第一条消息)是可知的,但已经分配给另一存在的上下文
Unknown or already allocated eNB UE S1AP ID
该动作失败是由于eNB UE S1AP ID要么是未知的,要么(MME接收的第一条消息)是可知的,但已经分配给另一存在的上下文
Unknown or inconsistent pair of UE S1AP ID
该动作失败是由于两个 UE S1AP IDs是未知的,或是可知的,但是没有定义单一的UE上下文
Handover Desirable for Radio Reasons
请求切换的原因是与无线相关
Time Critical Handover
请求切换是出于时间临界的原因,即如果不执行切换,连接有可能中断,该原因值描述这些所有的紧急情况
Resource Optimisation Handover
请求切换的原因是出于提高邻区的负载分配
Reduce Load in Serving Cell
服务小区上的负载需要减少
User Inactivity
请求该动作是由于用户在所有的E-RABs 上不活跃,例如为了最优化无线资源,请求释放S1 资源
Radio Connection With UE Lost
请求该 动作是由于与UE的无线连接不稳定
Load Balancing TAU Required
请求该动作是为了在MME处所有负载平衡以及卸载情况
CS Fallback triggered
该动作是由于已经触发一个CS回溯(CS fallback
UE Not Available for PS Service
请求该动作是由于已经出发一个小区更改命令(Cell Change Order
Radio resources not available
没有可请求的可用无线资源
Invalid QoS combination
该动作失败是由于无效的QoS结合
Inter-RAT Redirection
请求释放是由于RAT间重定向
Failure in the Radio Interface Procedure
无线接口过程已经失败
Interaction with other procedure
该动作是由于另一过程正在干扰
Unknown E-RAB ID
该动作失败是由于eNB E-RAB ID 是未知的
Multiple E-RAB ID Instances
该动作失败是由于已经提供给eNB关于同一个E-RAB 的多个实例
Encryption and/or integrity protection algorithms not supported
eNB无法支持UE支持的任何加密和/或完整性保护算法
S1 Intra system Handover triggered
该动作是由于已经触发一个SI系统内切换
S1 Inter system Handover triggered
该动作是由于已经触发一个SI系统外切换
X2 Handover triggered
该动作是由于已经触发一个X2 切换
Redirection towards 1xRTT
The release is requested due to redirection towards a 1xRTT system.
Not supported QCI Value
The E-RAB setup failed because the requested QCI is not supported.

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