3GPP TS 23501-g51 中英文对照 | 5.2.5 Access control and barring
个人在学习5G标准3GPP TS 23501-g51过程中，也发现google的机器翻译实在晦涩难懂，所以个人在借助百度翻译（中国人更懂中文）的同时，人工对每句话进行了校对。
在自己学习的同时，也将翻译内容分享给给广大网友。由于个人能力有限，翻译不到位的地方还请各位网友们指正。
5.2.5 Access control and barring
When the UE needs to transmit an initial NAS message, the UE shall request to establish an RRC Connection first and the NAS shall provide the RRC establishment related information to the lower layer. The RAN handles the RRC Connection with priority during and after RRC Connection Establishment procedure, when UE indicates priority in Establishment related information
当UE需要发送初始NAS消息时，UE应首先请求建立RRC Connection，NAS应向下层提供RRC建立相关信息。当UE在Establishment相关信息中指示优先级时，RAN在RRC Connection Establishment过程期间和之后以优先级处理RRC Connection。
Under high network load conditions, the network may protect itself against overload by using the Unified Access Control functionality for 3GPP access specified in TS 22.261 [2], TS 24.501 [47] and TS 38.300 [27] to limit access attempts from UEs. Depending on network configuration, the network may determine whether certain access attempt should be allowed or blocked based on categorized criteria, as specified in TS 22.261 [2] and TS 24.501 [47]. The NG-RAN may broadcast barring control information associated with Access Categories and Access Identities as specified in TS 38.300 [27].
在高网络负载条件下，网络可通过使用3GPP接入的Unified Access Control功能来限制来自UE的接入尝试，从而保护自身免受过载。根据网络配置，网络可确定是否应允许或阻止某些访问尝试。NG-RAN可以广播与Access Categories和Access Identities相关的限制控制信息。
The NG-RAN node may initiate such Unified Access Control when:
- AMFs request to restrict the load for UEs that access the network by sending OVERLOAD START message containing conditions defined in clause 5.19.5.2, or
-AMFs请求通过发送包含第5.19.5.2条中定义的条件的OVERLOAD START消息来限制接入网络的UE的负载，或
- requested by OAM, or
- triggered by NG-RAN itself.
If the NG-RAN node takes a decision to initiate UAC because of the reception of the N2 interface OVERLOAD START messages, the NG-RAN should only initiate such procedure if all the AMFs relevant to the request contained in the OVERLOAD START message and connected to this NG-RAN node request to restrict the load for UEs that access the network.
如果NG-RAN节点由于接收到N2接口OVERLOAD START消息而决定启动UAC，则NG-RAN应仅在与OVERLOAD START消息中包含的请求相关且连接到此NG-RAN节点的所有AMF请求限制接入网络的UE的负载时启动该过程。
If the UE supports both N1 and S1 modes NAS and, as defined in TS 23.401 [26], the UE is configured for Extended Access Barring (EAB) but is not configured with a permission for overriding Extended Access Barring (EAB), when the UE wants to access the 5GS it shall perform Unified Access Control checks for Access Category 1 on receiving an indication from the upper layers as defined in TS 24.501 [47], TS 38.331 [28], TS 36.331 [51].
wrong123
If the UE supports both N1 and S1 modes NAS and, as defined in TS 23.401 [26], the UE is configured with a permission for overriding Extended Access Barring (EAB), when the UE wants to access the 5GS it shall ignore Unified Access Control checks for Access Category 1 on receiving an indication from the upper layers, as defined in TS 24.501 [47].
wrong123
NOTE: UE signalling of Low Access Priority indication over N1 in 5GS is not supported in this release of the specification.
wrong123
Operator may provide one or more PLMN-specific Operator-defined access category definitions to the UE using NAS signalling, and the UE handles the Operator-defined access category definitions stored for the Registered PLMN, as specified in TS 24.501 [47].
wrong123
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