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。

5.20.3 ATSSS-LL functionality ATSSS-LL功能

Editor's Note: This clause will document any impact on N4 to support ATSSS-LL functionality in UPF, including support of Access Network Performance Measurement function, i.e. PMF.

编者注：该条款将记录对N4的任何影响，以支持UPF中的ATSSS-LL功能，包括对接入网络性能度量功能（即PMF）的支持。

5.20.3.1 Activate ATSSS-LL functionality and Exchange ATSSS-LL Parameters 激活ATSSS-LL功能并交换ATSSS-LL参数

If ATSSS-LL steering functionality is required for a Multi-Access PDU session, the SMF shall send ATSSS-LL Control Information to the UPF in PFCP Session Establishment Request, to instruct the UPF to activate the ATSSS-LL functionality for this PFCP session. The SMF may also request to activate the PMF functionality for this PFCP session by sending PMF Control Information to the UPF. As a result, the UPF(PSA) shall allocate necessary resources for ATSSS-LL and PMF and return the corresponding ATSSS-LL and PMF Parameters (e.g. PMF IP address and port, etc) to the SMF in PFCP Session Establishment Response.

如果Multi-Access PDU会话需要ATSSS-LL控制功能，SMF应在PFCP Session Establishment Request中将ATSSS-LL Control Information发送给UPF，以指示UPF激活此PFCP会话的ATSSS-LL功能。SMF还可以通过向UPF发送PMF Control Information来请求激活该PFCP会话的PMF功能。因此，UPF应为ATSSS-LL和PMF分配必要的资源，并在PFCP Session Establishment Response中将相应的ATSSS-LL和PMF Parameter返回给SMF。

The SMF may send ATSSS-LL Control Information and/or PMF Control Information to the UPF in PFCP Session Modification Request, with updated value, e.g. if the SMF receives updated ATSSS rules from the PCF.

例如，如果SMF从PCF接收到更新的ATSSS规则，则SMF可以在PFCP Session Modification Request中将ATSSS-LL Control Information和/或PMF Control Information发送给UPF，并具有更新的值。

NOTE: Such ATSSS-LL Parameters received by the SMF are sent to the UE together with the ATSSS rules, as specified in 3GPP TS 24.193 [59].

注意：如3GPP TS 24.193 [59]所指定，SMF接收到的此类ATSSS-LL参数与ATSSS规则一起发送到UE。