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。 

6.2.6 PFCP Association Setup Procedure PFCP偶联建立程序

6.2.6.1 General

The PFCP Association Setup procedure shall be used to setup a PFCP association between a CP function and a UP function, to enable the CP function to use the resources of the UP function subsequently, i.e. establish PFCP Sessions.

应使用PFCP Associataion Setup程序在CP功能和UP功能之间设置PFCP偶联，以便CP功能随后使用UP功能的资源，即建立PFCP Session。

The setup of a PFCP association may be initiated by the CP function (see clause 6.2.6.2) or the UP function (see clause 6.2.6.3).

PFCP偶联的建立可以由CP功能或UP功能启动。

The CP function and the UP function shall support the PFCP Association Setup initiated by the CP function. The CP function and the UP function may additionally support the PFCP Association Setup initiated by the UP function.

CP功能和UP功能应支持CP功能启动的PFCP Association Setup。CP功能和UP功能还可以支持由UP功能启动的PFCP Association Setup。

6.2.6.2 PFCP Association Setup Initiated by the CP Function 由CP功能启动的PFCP偶联建立

6.2.6.2.1 CP Function Behaviour CP功能行为

The CP function shall initiate the PFCP Association Setup procedure to request to setup a PFCP association towards a UP function prior to establishing a first PFCP session on this UP function.

CP功能应启动PFCP Association Setup程序，以请求在该UP功能上建立第一个PFCP会话之前，向UP功能建立PFCP偶联。

The CP function shall retrieve an IP address of the UP function to send the PFCP Association Setup Request, as specified in clause 5.8.1, and shall send a PFCP Association Setup Request to the UP function with:

CP功能应检索UP功能的IP地址以发送PFCP Association Setup Request，并应向UP功能发送PFCP Association Setup Request，包括：

- the Node ID of the CP function;

-CP功能的节点ID；

- the list of optional features the CP function supports which may affect the UP function behaviour, if any;

-CP功能支持的可能影响UP功能行为的可选功能列表（如有）；

- optionally, the PFCP Session Retention Information IE (see figure 7.4.4.1-2) to request the UP function to retain all or part of the existing PFCP sessions if a PFCP association already exists in the UP function for the same Node ID.

-可选地，PFCP Session Retention Information IE请求UP功能保留所有或部分现有PFCP会话（如果UP功能中已经存在相同Node ID的PFCP偶联）。

The CP function shall only initiate PFCP Session related signalling procedures toward a UP function after it receives the PFCP Association Setup Response with a successful cause from this UP function.

CP功能只能在收到来自该UP功能的带有成功原因的PFCP Association Setup Response后，才向UP功能发起PFCP Session相关信令程序。

The CP function shall determine whether the UP function supports Sxa, Sxb, Sxc and/or combined Sxa/Sxb by local configuration or optionally via DNS if deployed.

CP功能应确定UP功能是否通过本地配置或DNS（如果部署)支持Sxa、Sxb、Sxc和/或组合的Sxa/Sxb。

6.2.6.2.2 UP Function behaviour UP功能行为

When receiving a PFCP Association Setup Request, the UP function:

当接收PFCP Association Setup Request时，UP功能：

- if the request is accepted:

-如果请求被接受：

- shall store the Node ID of the CP function as the identifier of the PFCP association;

-应将CP功能的Node ID存储为PFCP偶联的标识符；

- shall send a PFCP Association Setup Response including:

-应发送PFCP Association Setup Response，包括：

- a successful cause;

-成功原因；

- its Node ID;

- information of all supported optional features in the UP function;

-UP功能中所有支持的可选功能的信息；

- optionally the available user plane resources, e.g. IP address(es) or F-TEID range;

-可选地，可用的用户平面资源，例如IP地址或F-TEID范围；

- optionally one or more UE IP address Pool Information IE which contains a list of UE IP Address Pool Identities per Network Instance;

-可选地，一个或多个UE IP address Pool Information IE，其包含每个Network Instance的UE IP Address Pool Identities列表；

- optionally the NF Instance ID of the UPF if available.

-UPF的NF Instance ID（如果可用）。

- shall send a PFCP Version Not Supported Response if the PFCP header of the request indicates a PFCP protocol version that is not supported by the UP function;

-如果请求的PFCP头表示UP功能不支持PFCP协议版本，则应发送PFCP Version Not Supported Response；

- otherwise, shall send a PFCP Association Setup Response with an appropriate error cause if the request is rejected.

-否则，如果请求被拒绝，则应发送带有适当错误原因的PFCP Association Setup Response。

If the PFCP Association Setup Request contains a Node ID for which a PFCP association was already established, the UP function shall:

如果PFCP Association Setup Request包含已建立PFCP偶联的Node ID，则UP功能应：

- proceed with establishing the new PFCP association (regardless of the Recovery Timestamp received in the request), overwriting the existing association;

-继续建立新的PFCP偶联，覆盖现有偶联；

- retain the PFCP sessions that were established with the existing PFCP association and that are requested to be retained, if the PFCP Session Retention Information IE was received in the request; otherwise, delete the PFCP sessions that were established with the existing PFCP association;

-如果请求中收到了PFCP Session Retention Information IE，则保留与现有PFCP偶联建立的和请求保留的PFCP会话；否则，删除与现有PFCP偶联建立的PFCP会话；

- set the PSREI (PFCP Session Retained Indication) flag set to "1" in the PFCP Association Setup Response, if the PFCP Session Retention Information IE was received in the Request and the requested PFCP sessions have been retained.

-如果在Request中接收到PFCP Session Retention Information IE并且已保留请求的PFCP会话，则在PFCP Association Setup Response中将PSREI标志设置为“1”。

6.2.6.3 PFCP Association Setup Initiated by the UP Function 由UP功能启动的PFCP偶联建立

6.2.6.3.1 UP Function Behaviour UP功能行为

The UP function initiates the PFCP Association Setup procedure to request to setup a PFCP association towards a CP function. The UP function is configured with a set of CP functions to which it shall establish a PFCP association.

UP功能启动PFCP Association Setup程序，请求向CP功能建立PFCP偶联。UP功能配置有一组CP功能，它应与这些功能建立PFCP偶联。

The UP function:

- shall retrieve an IP address of the CP function, e.g. based on local configuration in the UP function;

-应检索CP功能的IP地址，例如基于UP功能中的本地配置；

- shall send the PFCP Association Setup Request including:

-应发送PFCP Association Setup Request，包括：

- the Node ID of the UP function;

-UP功能的Node ID；

- information of all supported optional features in the UP function;

-UP功能中所有支持的可选功能的信息；

- optionally the available user plane resources, e.g. IP address(es) or F-TEID range;

-可选地，可用的用户平面资源，例如IP地址或F-TEID范围；

- optionally one or more UE IP address Pool Information IE which contains a list of UE IP Address Pool Identities per a given Network Instance;

-可选地，一个或多个UE IP address Pool Information IE，其包含每个给定Network Instance的UE IP Address Pool Identities的列表；

- optionally the NF Instance ID of the UPF if available.

-UPF的NF Instance ID（如果可用）。

6.2.6.3.2 CP Function Behaviour CP功能行为

When receiving a PFCP Association Setup Request, the CP function:

当接收到PFCP Association Setup Request时，CP功能：

- if the request is accepted:

-如果请求被接受：

- shall store the Node ID of the UP function as the identifier of the PFCP association;

-应将UP功能的Node ID存储为PFCP偶联的标识符；

- shall send a PFCP Association Setup Response with a successful cause, its Node ID, and information of the list of optional features the CP function supports which may affect the UP function behaviour, if any;

-应发送一个PFCP Association Setup Response，包括成功原因、其Node ID以及CP功能支持的可能影响UP功能行为（如有）的可选功能列表的信息；

- shall send a PFCP Version Not Supported Response if the PFCP header of the request indicates a PFCP protocol version that is not supported by the CP function;

-如果请求的PFCP头表示CP功能不支持PFCP协议版本，则应发送PFCP Version Not Supported Response；

- otherwise, shall send a PFCP Association Setup Response with an appropriate error cause if the request is rejected.

-否则，如果请求被拒绝，则应发送带有适当错误原因的PFCP Association Setup Response。

The CP function shall only initiate PFCP Session related signalling procedures toward a UP function after it has sent the PFCP Association Setup Response with a successful cause to the UP function.

CP功能仅应在向UP功能发送成功原因的PFCP Association Setup Response后，向UP功能发起与PFCP Session相关的信令程序。

The CP function shall determine the UP function supports Sxa, Sxb, Sxc and/or combined Sxa/Sxb by local configuration or optionally via DNS if deployed.

CP功能应确定UP功能支持Sxa、Sxb、Sxc和/或Sxa/Sxb组合，可通过本地配置，也可通过DNS（如果部署）。