个人在学习5G标准3GPP TS 23502-g40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。

4.17.4 NF/NF service discovery by NF service consumer in the same PLMN

Figure 4.17.4-1: NF/NF service discovery in the same PLMN

1. The NF service consumer intends to discover services available in the network based on service name and target NF type. The NF service consumer invokes Nnrf_NFDiscovery_Request (Expected NF service Name, NF Type of the expected NF instance, NF type of the NF consumer) from an appropriate configured NRF in the same PLMN. The parameter may include optionally producer NF Set ID, NF Service Set ID, SUPI, Data Set Identifier(s), External Group ID (for UDM, UDR discovery), UE's Routing Indicator (for UDM and AUSF discovery), S-NSSAI, NSI ID if available, and other service related parameters. In addition, for AMF discovery, the parameters may include AMF Region ID, AMF Set ID, TAI. The NF service consumer may indicate a preference for target NF location in the Nnrf_NFDiscovery_Request. A complete list of parameters is provided in service definition in clause 5.2.7.3.2.
   
   1.NF服务消费者打算根据服务名称和目标NF类型发现网络中可用的服务。NF服务消费者从同一PLMN中适当配置的NRF调用Nnrf_NFDiscovery_Request（预期的NF服务名称、预期的NF实例的NF Type、NF消费者的NF类型）。该参数可以可选地包括生产者NF Set ID、NF Service Set ID、SUPI、Data Set Identifier、External Group ID（用于UDM、UDR发现）、UE的Routing Indicator（用于UDM和AUSF发现）、S-NSSAI、NSI ID（如果可用）和其他服务相关参数。此外，对于AMF发现，参数可以包括AMF Region ID、AMF Set ID、TAI。NF服务消费者可在Nnrf_NFDiscovery_Request中指示对目标NF位置的偏好。

NOTE 1: The NF service consumer indicates its NF location for preference for target NF location.

注1：NF服务消费者指示其NF位置，以便优先选择目标NF位置。

NOTE 2: The use of NSI ID within a PLMN depends on the network deployment.

注2：PLMN中NSI ID的使用取决于网络部署。

NOTE 3: The need for other service related parameters depends on the NF type of the expected NF instance(s) and refer to the clause 6.3 " Principles for Network function and Network Function Service discovery and selection" in TS 23.501 [2]. It is up to NF implementation whether one or multiple NF service instances are registered in the NRF.

注3：其他服务相关参数的需要取决于预期NF实例的NF类型，并参考TS 23.501[2]中的第6.3条“Network功能和Network Function Service发现和选择原则”。是否在NRF中注册一个或多个NF服务实例取决于NF实现。

1. The NRF authorizes the Nnrf_NFDiscovery_Request. Based on the profile of the expected NF/NF service and the type of the NF service consumer, the NRF determines whether the NF service consumer is allowed to discover the expected NF instance(s). If the expected NF instance(s) or NF service instance(s) are deployed in a certain network slice, NRF authorizes the discovery request according to the discovery configuration of the Network Slice, e.g. the expected NF instance(s) are only discoverable by the NF in the same network slice.
   
   2.NRF授权Nnrf_NFDiscovery_Request。根据预期的NF/NF服务的配置文件和NF服务消费者的类型，NRF确定是否允许NF服务消费者发现预期的NF实例。如果预期的NF实例或NF服务实例部署在某个网络片中，则NRF根据该Network Slice的发现配置授权发现请求，例如，预期的NF实例仅可由同一网络片中的NF发现。
2. If allowed, the NRF determines a set of NF instance(s) matching the Nnrf_NFDiscovery_Request and internal policies of the NRF and sends the NF profile(s) of the determined NF instances. Each NF profile containing at least the output required parameters (see clause 5.2.7.3.2) to the NF service consumer via Nnrf_NFDiscovery_Request Response message.
   
   3.如果允许，NRF确定一组匹配Nnrf_NFDiscovery_Request和NRF内部策略的NF实例，并发送确定的NF实例的NF配置文件。每个NF配置文件至少包含通过Nnrf_NFDiscovery_Request Response消息向NF服务消费者输出所需参数。

If the target NF is UDR, UDM or AUSF, if SUPI was used as optional input parameter in the request, the NRF shall provide the corresponding UDR, UDM or AUSF instance(s) that matches the optional input SUPI. Otherwise, if SUPI is not provided in the request, the NRF shall return all applicable UDR instance(s) (e.g. based on the Data Set Id, NF type), UDM instance(s) or AUSF instance(s) (e.g. based on NF type) and if applicable, the information of the range of SUPI(s) and/or Data Set Id each UDR instance is supporting.

如果目标NF是UDR、UDM或AUSF，如果SUPI在请求中用作可选输入参数，则NRF应提供与可选输入SUPI匹配的相应UDR、UDM或AUSF实例。否则，如果请求中未提供SUPI，NRF应返回所有适用的UDR实例（例如基于Data Set Id、NF类型）、UDM实例或AUSF实例（例如基于NF类型），如果适用，还应返回每个UDR实例支持的SUPI范围和/或Data Set Id的信息。

If the target NF is CHF, if SUPI, GPSI or PLMN ID was used as optional input parameter in the request, the NRF shall provide the corresponding CHF instance(s) that matches the optional input SUPI, GPSI or PLMN ID. The NRF shall provide the primary CHF instance and the secondary CHF instance pair(s) together. Otherwise, if neither SUPI/PLMN ID nor GPSI is provided in the request, the NRF shall return all applicable CHF instance(s) and if applicable, the information of the range of SUPI(s), GPSI(s) or PLMN ID(s).

如果目标NF为CHF，如果SUPI、GPSI或PLMN ID用作请求中的可选输入参数，则NRF应提供与可选输入SUPI、GPSI或PLMN ID匹配的相应CHF实例。NRF应同时提供主CHF实例和次CHF实例对。否则，如果请求中未提供SUPI/PLMN ID或GPSI，NRF应返回所有适用的CHF实例，如果适用，还应返回SUPI、GPSI或PLMN ID范围的信息。

If the NF service consumer provided a preferred target NF location, the NRF shall not limit the set of discovered NF instances or NF service instance(s) to the target NF location, e.g. the NRF may provide NF instance(s) or NF service instance(s) for which location is not the preferred target NF location if no NF instance or NF service instance could be found for the preferred target NF location.

如果NF服务消费者提供了首选目标NF位置，则NRF不得将发现的NF实例集或NF服务实例限制在目标NF位置，例如，如果找不到首选目标NF位置的NF实例或NF服务实例，则NRF可提供位置不是首选目标NF位置的NF实例或NF服务实例。