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。

4.3.3 Interworking between 5GC via non-3GPP access and E-UTRAN connected to EPC

4.3.3.1 Non-roaming architecture

Figure 4.3.3-1 represents the non-roaming architecture for interworking between 5GC via non-3GPP access and EPC/E-UTRAN.

图4.3.3-1表示5GC通过non-3GPP接入与EPC/E-UTRAN互通的non-roaming架构。

Figure 4.3.3.1-1: Non-roaming architecture for interworking between 5GC via non-3GPP access and EPC/E-UTRAN

NOTE 1: There can be another UPF (not shown in the figure above) between the N3IWF/TNGF and the UPF + PGW-U, i.e. the UPF + PGW-U can support N9 towards an additional UPF, if needed.

注1：在N3IWF/TNGF和UPF+PGW-U之间可以有另一个UPF（上图中未显示），也就是说，如果需要，UPF+PGW-U可以支持N9走向另一个UPF。

NOTE 2: N26 interface is not precluded, but it is not shown in the figure because it is not required for the interworking between 5GC via non-3GPP access and EPC/E-UTRAN.

注2：不排除N26接口，但图中未显示，因为5GC通过non-3GPP接入与EPC/E-UTRAN互通不需要N26接口。

4.3.3.2 Roaming architecture

Figure 4.3.3.2-1 represents the Roaming architecture with local breakout and Figure 4.3.3.2-2 represents the Roaming architecture with home-routed traffic for interworking between 5GC via non-3GPP access and EPC/E-UTRAN.

图4.3.3.2-1表示具有本地分流的Roaming架构，图4.3.3.2-2表示具有通过non-3GPP接入在5GC和EPC/E-UTRAN之间互通的home-routed流量的Roaming架构。

Figure 4.3.3.2-1: Local breakout roaming architecture for interworking between 5GC via non-3GPP access and EPC/E-UTRAN

NOTE 1: There can be another UPF (not shown in the figure above) between the N3IWF/TNGF and the UPF + PGW-U, i.e. the UPF + PGW-U can support N9 towards the additional UPF, if needed.

注1：在N3IWF/TNGF和UPF+PGW-U之间可以有另一个UPF（上图中未显示），也就是说，如果需要，UPF+PGW-U可以支持N9朝向附加UPF。

NOTE 2: S9 interface from EPC is not required since no known deployment exists.

NOTE 3: N26 interface is not precluded, but it not shown in the figure because it is not required for the interworking between 5GC via non-3GPP access and EPC/E-UTRAN.

注3：不排除N26接口，但图中未显示，因为5GC通过non-3GPP接入与EPC/E-UTRAN互通不需要N26接口。

Figure 4.3.3.2-2: Home-routed roaming architecture for interworking between 5GC via non-3GPP access and EPC/E-UTRAN

NOTE 4: N26 interface is not precluded, but it not shown in the figure because it is not required for the interworking between 5GC via non-3GPP access and EPC/E-UTRAN.

注4：不排除N26接口，但图中未显示，因为5GC通过non-3GPP接入与EPC/E-UTRAN互通不需要N26接口。