学习5G知识，势必要去阅读相关的技术标准，而纯英文的标准协议对于初学者来说是个门槛。

个人在学习5G标准3GPP TS 29244-g30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。

5.5.3 F-TEID allocation in the UP function UP功能中的F-TEID分配

The CP function shall request the UP function to allocate the F-TEID by setting the CHOOSE flag in the Local F-TEID IE of the PDR IE (see Table 7.5.2.2-1). The Source Interface IE indicates for which interface the F-TEID is to be assigned.

CP功能应通过在PDR IE的Local F-TEID IE中设置CHOOSE标志来请求UP功能分配F-TEID。Source Interface IE指示F-TEID将分配给哪个接口。

The CP function may request the UP function to allocate the same F-TEID to several PDRs to be created within one single PFCP Session Establishment Request or PFCP Session Modification Request by:

CP功能可通过以下方式请求UP功能将相同的F-TEID分配给要在单个PFCP Session Establishment Request或PFCP Session Modification Request内创建的多个PDR：

- setting the CHOOSE flag in the Local F-TEID IE of each PDR to be created with a new F-TEID; and

-在每个PDR的Local F-TEID IE中设置CHOOSE标志，以创建新的F-TEID；以及

- setting the CHOOSE ID field of the Local F-TEID IE, for each PDR to be created with the same F-TEID, with the same CHOOSE ID value;

-设置Local F-TEID IE的CHOOSE ID字段，对于要使用相同F-TEID、相同CHOOSE ID值创建的每个PDR；

or, if the UP function indicated support of the PDI optimization (see clause 8.2.25), by:

或者，如果UP功能表示支持PDI优化，则通过：

- including the Local F-TEID IE only in the Create Traffic Endpoint IE and by setting the CHOOSE flag in the Local F-TEID IE of this IE; and

-仅在Create Traffic Endpoint IE中包含Local F-TEID IE，并通过在该IE的Local F-TEID IE中设置CHOOSE标志；以及

- including the Traffic Endpoint ID in all the PDRs to be created with the same F-TEID.

-在所有要用相同F-TEID创建的PDR中包含Traffic Endpoint ID。

If the PDR(s) is created successfully, the UP function shall return the F-TEID(s) it has assigned to the PDR(s) or to the Traffic Endpoint(s) in the PFCP Session Establishment Response or PFCP Session Modification Response.

如果成功创建PDR，UP功能应返回其在PFCP Session Establishment Response或PFCP Session Modification Response中分配给PDR或Traffic Endpoint的F-TEID。

Upon receiving a request to remove a PDR or a Traffic Endpoint, or to delete a PFCP session, the UP function shall free the F-TEID(s) that was assigned to the PDR if there is no more PDR with the same F-TEID, to the Traffic Endpoint or to the PFCP Session.

在收到删除PDR或Traffic Endpoint或删除PFCP会话的请求时，UP功能应释放分配给PDR的F-TEID（如果没有更多具有相同F-TEID的PDR）、Traffic Endpoint或PFCP会话。

When using redundant GTP-U transmission on N3/N9 interfaces (see clause 5.24.2), the CP function shall request the UP function to allocate the F-TEID for the redundant GTP-U tunnel following the same requirements as specified in this clause, using the "Local F-TEID for Redundant Transmission" IE instead of the "Local F-TEID" IE.

当在N3/N9接口上使用冗余GTP-U传输时，CP功能应请求UP功能按照本条规定的相同要求为冗余GTP-U隧道分配F-TEID，使用“Local F-TEID for Redundant Transmission”IE而不是“Local F-TEID”IE。