3GPP TS 23501-h20 中英文对照 | 5.8.2.13 Support for 5G VN group communication

Posted 2022-01-02 COCOgsta

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5.8.2.13 Support for 5G VN group communication

5.8.2.13.0 General

The SMF may configure the UPF(s) to apply different traffic forwarding methods to route traffic between PDU Sessions for a single 5G VN group. For example, depending on the destination address, some packet flows may be forwarded locally, while other packet flows are forwarded via N19 and other packet flows are forwarded to N6.

SMF可将UPF配置为应用不同的流量转发方法来路由单个5G VN组的PDU Session之间的流量。例如，根据目的地地址，一些分组流可以在本地转发，而其他分组流通过N19转发，其他分组流转发到N6。

The UPF local switching, N6-based forwarding and N19-based forwarding methods require that a common SMF is controlling the PSA UPFs for the 5G VN group.

UPF本地交换、基于N6的转发和基于N19的转发方法要求公共SMF控制5G VN组的PSA UPF。

5G VN group communication includes one to one communication and one to many communication. One to one communication supports forwarding of unicast traffic between two UEs within a 5G VN, or between a UE and a device on the DN. One to many communication supports forwarding of multicast traffic and broadcast traffic from one UE (or device on the DN) to many/all UEs within a 5G VN and devices on the DN.

5G VN组通信包括一对一通信和一对多通信。一对一通信支持在5G VN内的两个UE之间，或在UE和DN上的设备之间转发单播流量。一对多通信支持将多播流量和广播流量从一个UE（或DN上的设备）转发到5G VN内的多个/所有UE和DN上的设备。

Traffic forwarding within the 5G VN group is realized by using a UPF internal interface ("5G VN internal") and a two-step detection and forwarding process. In the first step, the packets received from any 5G VN group member (via it's PDU Session, via N6 or via N19) are forwarded to the UPF internal interface (i.e. Destination Interface set to "5G VN internal"). In the second step, PDRs installed at the UPF internal interface (i.e. Source Interface set to "5G VN internal") detect the packet and forward it to the respective 5G VN group member (via it's PDU Session, via N6 or via N19). The details of the PDR and FAR configuration are described in the following clauses.

通过使用UPF内部接口（“5G VN internal”）和两步检测和转发过程来实现5G VN组内的流量转发。在第一步中，从任何5G VN组成员（通过其PDU Session、通过N6或通过N19）接收的数据包被转发到UPF内部接口（即，Destination Interface设置为“5G VN internal”）。在第二步中，安装在UPF内部接口（即，Source Interface设置为“5G VN internal”）的PDR检测数据包并将其转发给相应的5G VN组成员（通过其PDU Session、通过N6或通过N19）。以下条款描述了PDR和FAR配置的详细信息。

For UEs belonging to the same 5G VN group and having PDU Sessions that correspond to N4 Sessions in the same PSA UPF, the following applies for traffic that is sent from one of these UEs to another one of these UEs using local switching: The incoming traffic for one PDU Session will match the corresponding N4 Session's PDR(s) of the source PDU Session (based on GTP-U header information). The traffic is then sent back to classification in that UPF (via the internal interface) and will match another N4 Session corresponding to the destination PDU Session (based on destination address in the PDU). The PDU is then forwarded to the target UE.

对于属于同一5G VN组且具有与同一PSA UPF中的N4 Session相对应的PDU Session的UE，以下适用于使用本地交换从这些UE之一发送到这些UE中的另一个的流量：一个PDU Session的传入流量将匹配对应的N4 Session的PDR源PDU Session的名称（基于GTP-U头信息）。然后，流量被发送回该UPF中的分类器（通过内部接口），并将匹配与目标PDU Session相对应的另一个N4 Session（基于PDU中的目标地址）。然后将PDU转发到目标UE。

If 5G VN group members' PDU Sessions are served by different PSA UPFs and N19-based forwarding is applied, the SMF creates a group-level N4 Session with each involved UPF to enable N19-based forwarding and N6-based forwarding. When the traffic is then sent back to classification in that UPF (via the internal interface) it may match group-level N4 Session corresponding to the 5G VN group (based on destination address in the PDU or a default PDR rule with match-all packet filter). The PDU is then forwarded to N6 or to the UPF indicated in the group-level N4 Session via corresponding N19 tunnel. This enables the PDU to be sent to the target group member in the other UPF or to the device in the DN.

如果5G VN组成员的PDU Session由不同的PSA UPF提供服务，并且应用了基于N19的转发，则SMF将使用每个涉及的UPF创建一个组级N4 Session，以启用基于N19的转发和基于N6的转发。当流量随后被发送回该UPF中的分类器时（通过内部接口），它可以匹配对应于5G VN组的组级N4 Session（基于PDU中的目的地地址或带有match all数据包过滤器的默认PDR规则）。然后，PDU通过相应的N19隧道转发到N6或组级N4 Session中指示的UPF。这使PDU能够发送到另一个UPF中的目标组成员或DN中的设备。

In the case of N19-based forwarding is not applied for a 5G VN group, group level N4 session is not required.

如果5G VN组未应用基于N19的转发，则不需要组级N4 Session。

If more than one 5G VN group has to be supported in the PLMN, the N4 rule attribute Network Instance is used in addition to the UPF internal interface and set to a value representing the 5G VN group. This keeps the traffic of different 5G VN groups separate from each other and thus enables isolation of the 5G VN group communication during the packet detection and forwarding process. The SMF shall provide the PDRs and FARs related to the UPF internal interface as follows whenever more than one 5G VN group has to be supported in the PLMN:

如果PLMN中必须支持多个5G VN组，则除UPF内部接口外，还将使用N4规则属性Network Instance，并将其设置为表示5G VN组的值。这使得不同5G VN组的通信量彼此分离，从而能够在分组检测和转发过程中隔离5G VN组通信。每当PLMN中必须支持一个以上的5G VN组时，SMF应提供与UPF内部接口相关的PDR和FAR，如下所示：

- The FAR with Destination Interface set to "5G VN internal" shall also contain the Network Instance set to the value representing the 5G VN group.

-Destination Interface设置为“5G VN internal”的FAR还应包含设置为代表5G VN组的值的Network Instance。

- The PDR with Source Interface set to "5G VN internal" shall also contain the Network Instance set to the value representing the 5G VN group.

-Source Interface置为“5G VN internal”的PDR还应包含设置为代表5G VN组的值的Network Instance。

Forwarding Ethernet unicast traffic towards the PDU Session corresponding to the Destination MAC address of an Ethernet frame may correspond:

向对应于Ethernet帧的目的地MAC地址的PDU Session转发Ethernet单播流量可以对应于：

- either to the SMF explicitly configuring DL PDR(s) with the MAC addresses detected by the UPF on PDU Sessions and reported to the SMF; this is further described in clause 5.8.2.13.1;

-向SMF显式配置DL PDR，其中MAC地址由UPF在PDU Session上检测并报告给SMF；第5.8.2.13.1条对此作了进一步说明；

- or to the SMF relying on MAC address learning in UPF as defined in clause 5.8.2.5.3. To request this UPF behaviour the SMF sets the Ethernet PDU Session Information indication in the DL PDR of the "5G VN internal" interface related with a 5G VN group. This may apply in the case that all PDU Sessions related with this 5G VN group are served by the same PSA or by multiple PSAs not inter-connected via N19.

-或第5.8.2.5.3条中定义的依赖于UPF中MAC地址学习的SMF。为了请求此UPF行为，SMF在与5G VN组相关的“5G VN internal”接口的DL PDR中设置Ethernet PDU Session Information指示。这可能适用于与该5G VN组相关的所有PDU Session由同一PSA或多个未通过N19互连的PSA提供服务的情况。

For Ethernet traffic on 5G-VN, in the former case above where SMF explicitly configures DL PDR with the MAC addresses detected on PDU Sessions supporting a 5G VN group, the SMF acts as a central controller which is responsible for setting up the forwarding rules in the UPFs so that it avoids forwarding loops. The SMF becomes aware of the MAC addresses in use within a 5G VN group by the UPF's reporting of the MAC addresses. The SMF is responsible to react to topology changes in the Ethernet network. Local switching without SMF involvement is not specified for a 5G-VN when different PDU Sessions related with this 5G VN group may be served by different PSA(s) connected over N19.

对于5G-VN上的Ethernet流量，在上面的前一种情况下，SMF使用在支持5G VN组的PDU Session上检测到的MAC地址显式配置DL PDR，SMF充当中央控制器，负责在UPFs中设置转发规则，以避免转发环路。通过UPF对MAC地址的报告，SMF意识到在5G VN组内使用的MAC地址。SMF负责对Ethernet网中的拓扑变化做出反应。当与5G VN组相关的不同PDU Session可能由通过N19连接的不同PSA提供服务时，不为5G VN指定不涉及SMF的本地切换。

NOTE: The mechanisms described above implies signalling on N4 Sessions related with a VN group each time a new MAC address is detected as used (or no more used) within a PDU Session related with this 5G VN group. Hence the usage of the solution with SMF explicitly configuring DL PDR with the MAC addresses defined in this release can raise signalling scalability issues for large VN groups with lots of devices (MAC addresses) served by PDU sessions related with this VN group.

注：上述机制意味着每当在与该5G VN组相关的PDU Session中检测到新MAC地址被使用（或不再被使用）时，在与VN组相关的N4 Session上发送信令。因此，使用SMF解决方案显式配置DL PDR和本版本中定义的MAC地址可能会引起大型VN组的信令可扩展性问题，这些大型VN组具有大量设备（MAC地址），由与此VN组相关的PDU会话提供服务。

5.8.2.13.1 Support for unicast traffic forwarding of a 5G VN

To enable unicast traffic forwarding in a UPF, the following applies:

要在UPF中启用单播流量转发，请执行以下操作：

- The SMF provides for each 5G VN group member's N4 Session (i.e. N4 Session corresponding to PDU Session) the following N4 rules that enable the processing of packets received from this UE.

-SMF为每个5G VN组成员的N4 Session（即，与PDU Session相对应的N4 Session）提供以下N4规则，以处理从该UE接收的数据包。

- in order to detect the traffic, a PDR containing Source Interface set to "access side", and CN Tunnel Information set to PDU Session tunnel header (i.e. N3 or N9 GTP-U F-TEID); and

-为了检测流量，一个PDR，其Source Interface的PDR设置为“access side”，CN Tunnel Information设置为PDU Session隧道报头（即N3或N9 GTP-U F-TEID）；且

- in order to forward the traffic, a FAR containing Destination Interface set to "5G VN internal".

-为了转发流量，一个FAR，其Destination Interface设置为“5G VN internal”。

- The SMF provides for each 5G VN group member's N4 Session (i.e. N4 session corresponding to PDU Session) the following N4 rules that enable the processing of packets towards this UE.

-SMF为每个5G VN组成员的N4 Session（即，与PDU Session相对应的N4 Session）提供以下N4规则，这些规则支持处理发往UE的分组。

- in order to detect the traffic, a PDR containing Source Interface set to "5G VN internal", and Destination Address set to the IP/MAC address (es) of this 5G VN group member; and

-为了检测流量，一个PDR，其Source Interface设置为“5G VN internal”，Destination Address设置为该5G VN组成员的IP/MAC地址；且

- in order to forward the traffic, a FAR containing Outer Header Creation indicating the N3/N9 tunnel information, and Destination Interface set "access side".

-为了转发流量，一个FAR，其Outer Header Creation指示N3/N9隧道信息，Destination Interface设置为“access side”。

- If N19-based forwarding is applied, the SMF configures the group-level N4 Session for processing packets received from a N19 tunnel with the following N4 rules for each N19 tunnel.

-如果应用了基于N19的转发，SMF配置组级N4 Session，用于处理从N19隧道接收的数据包，每个N19隧道具有以下N4规则。

- in order to detect the traffic, a PDR containing Source Interface set to "core side", and CN Tunnel Information set to N19 tunnel header (i.e. N19 GTP-U F-TEID); and

-为了检测流量，一个PDR，其Source Interface设置为“core side”，CN Tunnel Information设置为N19隧道报头（即N19 GTP-U F-TEID）；且

- in order to forward the traffic, a FAR containing Destination Interface set to "5G VN internal".

-为了转发流量，一个FAR，其Destination Interface设置为“5G VN internal”。

- If N19-based forwarding is applied, the SMF configures the group-level N4 Session for processing packets towards 5G VN group members anchored at other UPFs with the following N4 rules for each N19 tunnel.

-如果应用了基于N19的转发，则SMF将配置组级N4 Session，用于处理发往锚定在其他UPF上的5G VN组成员的数据包，每个N19隧道使用以下N4规则。

- in order to detect the traffic, a PDR containing Source Interface set to "5G VN internal", and Destination Address set to the IP/MAC address (es) of UEs anchored at the peer UPF of this N19 tunnel; and

-为了检测流量，一个PDR，其Source Interface设置为“5G VN internal”，以及Destination Address设置为锚定在该N19隧道的对等UPF处的UE的IP/MAC地址的目的地地址；且

- in order to forward the traffic to a 5G VN group member anchored at another UPF via the N19 tunnel, a FAR containing Outer Header Creation indicating the N19 tunnel information, Destination Interface set to "core side".

-为了通过N19隧道将流量转发给锚定在另一个UPF上的5G VN组成员，一个FAR，其Outer Header Creation指示N19隧道信息，Destination Interface设置为“core side”。

- The SMF configures the group-level N4 Session for processing packets received from a 5G VN group member connected via N6 with the following N4 rules.

-SMF将组级N4 Session，用于处理从通过N6连接的5G VN组成员接收的数据包，并遵循以下N4规则。

- in order to detect the traffic, a PDR containing Source Interface set to "core side", and Source Address set to the IP/MAC address (es) of this 5G VN group member; and

-为了检测流量，一个PDR，其Source Interface设置为“core side”，Source Address设置为该5G VN组成员的IP/MAC地址的源地址；且

- in order to forward the traffic, a FAR containing Destination Interface set to "5G VN internal".

-为了转发流量，一个FAR，其Destination Interface设置为“5G VN internal”。

- The SMF configures the group-level N4 Session for processing packets towards a 5G VN group member connected via N6 or packets towards a device residing in DN with the following N4 rules.

-SMF配置组级N4 Session，用于处理通过N6连接发往5G VN组成员的数据包，或处理发往驻留在DN中的设备的数据包，并遵循以下N4规则。

- in order to detect the traffic, a PDR containing Source Interface set to "5G VN internal", and Destination Address set to the IP/MAC address (es) of this 5G VN group member; and

-为了检测流量，一个PDR，其Source Interface 设置为“5G VN internal”，Destination Address设置为该 5G VN 组成员的 IP/MAC 地址； 且

- in order to forward the traffic to the 5G VN group member or device via N6, a FAR containing Destination Interface set to "core side".

-为了通过N6将流量转发到5G VN组成员或设备，一个FAR，其Destination Interface设置为“core side”。

- The SMF shall update N4 rules for group-level N4 Session to enable correct forwarding of packets towards UE who's PSA UPF has been reallocated and address is unchanged.

-SMF应更新组级N4 Session Session的N4规则，以便能够正确地向PSA UPF已重新分配且地址未更改的UE转发数据包。

- The SMF may also configure the following N4 rules for the group-level N4 Session to process packets with an unknown destination address:

-SMF还可以为组级N4 Session配置以下N4规则，以处理具有未知目的地地址的分组：

- in order to detect the traffic, a PDR containing Source Interface set to "5G VN internal", a match-all Packet Filter, and a Precedence set to the lowest precedence value; and

-为了检测流量，一个PDR，其Source Interface设置为“5G VN internal”、Packet Filter设置为match-all，Precedence设置为最低优先级值；且

- in order to process the traffic, a FAR containing Destination Interface set to "core side" to route the traffic via N6 by default, or in the case of local SMF configuration that N6-based forwarding is not applied a FAR instructing the UPF to drop the traffic.

-为了处理流量，一个FAR，其Destination Interface设置为“core side”，默认路由N6流量，或者在本地SMF配置不应用基于N6的转发，FAR指示UPF丢弃流量。

5.8.2.13.2 Support for unicast traffic forwarding update due to UE mobility

To enable the service continuity when the PSA UPF serving the UE changed, the following applies:

为了在为UE提供服务的PSA UPF发生变化时启用服务连续性，以下各项适用：

- Keep the UE address unchanged if N6-based forwarding is not used.

-如果未使用基于N6的转发，保持UE地址不变。

- Configure the UE's N4 Session with N4 rules (PDR, FAR) to detect and forward the traffic to this UE via its PDU Session tunnel(i.e. N3 tunnel) on the target PSA UPF.

-使用N4规则（PDR、FAR）配置UE的N4 Session，以通过目标PSA UPF上的PDU Session隧道（即N3隧道）检测流量并将其转发到此UE。

- If N19-based forwarding is applied: To switch the traffic towards this UE from the source PSA UPF to the target PSA UPF for N19-based forwarding, the SMF deletes the N4 rule (PDR) that detects the traffic towards this UE in the group-level N4 Session at UPFs involved in the 5G VN group (except the source PSA UPF), then adds or updates the PDR that detects the traffic towards this UE with the FAR containing the N19 tunnel information of the target PSA UPF in the group-level N4 Session at UPFs involved in the 5G VN group (except the target PSA UPF).

-如果应用了基于N19的转发：为了将流向该UE的流量从源PSA UPF切换到目标PSA UPF以进行基于N19的转发，SMF删除在5G VN组（源PSA UPF除外）中涉及的UPF的组级N4 Session中检测流向该UE的流量的N4规则（PDR），然后，在5G VN组（目标PSA UPF除外）中涉及的UPFs的组级N4 Session中，使用包含目标PSA UPF的N19隧道信息的FAR添加或更新检测到此UE的业务的PDR。

5.8.2.13.3 Support for user plane traffic replication in a 5G VN

5.8.2.13.3.1 User plane traffic replication based on UPF internal functionality

For Ethernet PDU Sessions, the SMF may instruct the UPF to route traffic to be replicated as described in clause 5.8.2.5.

对于Ethernet PDU Sesion，SMF可指示UPF按照第5.8.2.5条所述路由要复制的流量。

For IP PDU Session types, the SMF may instruct the UPF to manage IP multicast traffic as described in clauses 4.6.6 and 7.7.1 of TS 23.316 [84]. The UPF replicates the IP multicast traffic received from PDU Sessions or N6 interface and sends the packets over other PDU Sessions and other N6 interface subscribed to the IP Multicast groups.

对于IP PDU Session类型，SMF可指示UPF管理TS 23.316[84]第4.6.6条和第7.7.1条中所述的IP多播流量。UPF复制从PDU Session或N6接口接收的IP多播流量，并通过其他PDU Session和订阅给IP Multicast组的其他N6接口发送数据包。

Mechanisms described in clauses 4.6.6 and 7.7.1 of TS 23.316 [84] apply to support 5G VN group communication with following clarifications:

TS 23.316[84]第4.6.6条和第7.7.1条中描述的机制适用于支持5G VN组通信，具体说明如下：

- These mechanisms are not limited to Wireline access and can apply on any access,

-这些机制不仅限于有线接入，而且可以应用于任何接入，

- IP Multicast traffic allowed for a PDU Session is not meant for IPTV services reachable over N6,

-PDU Session允许的IP Multicast流量并不适用于可通过N6访问的IPTV服务，

- IGMP /MLD signalling does not relate with STB or 5G-RG: Clauses 4.6.6 and 7.7.1 of TS 23.316 [84], apply to UE members of a 5G VN group instead of 5G-RG, and

-IGMP/MLD信令与STB或5G-RG无关：TS 23.316[84]第4.6.6条和第7.7.1条适用于5G VN组的UE成员，而不是5G-RG，以及

- Clauses 7.7.1.1.2 and 7.7.1.1.4 of TS 23.316 [84] are not applicable to 5G VN groups: members of the 5G VN groups may receive any multicast traffic associated with the (DNN, S-NSSAI) of the 5G VN group.

-TS 23.316[84]第7.7.1.1.2条和第7.7.1.1.4条不适用于5G VN组：5G VN组的成员可以接收与5G VN组的（DNN，S-NSSAI）相关的任何多播流量。

- UPF exchange of signalling such as PIM (Protocol-Independent Multicast) may apply as defined in TS 23.316, with following clarification:

-UPF信令交换，如PIM（Protocol-Independent Multicast）可适用于TS 23.316中的定义，并有以下说明：

- PIM signalling is generally exchanged over N6 but may be sent towards the PDU Session supporting the source address of multicast traffic identified by IGMP / MLD signalling for Source Specific Multicast. In the case of IGMP / MLD signalling not related with Source Specific Multicast no PIM signalling is sent towards any PDU Session

-PIM信令通常通过N6交换，但可以发送到支持由IGMP/MLD信令识别的多播流量源地址的PDU Session，用于Source Specific Multicast。在与Source Specific Multicast无关的IGMP/MLD信令的情况下，不会向任何PDU Session Session发送PIM信令

5.8.2.13.3.2 User plane traffic replication based on PDRs with replication instructions

Alternatively, for IP or Ethernet type data communication, the SMF instructs the UPF via PDRs and FARs how to replicate user plane traffic.

或者，对于IP或Ethernet类型的数据通信，SMF通过PDR和FARs指示UPF如何复制用户平面流量。

The mechanism is supported in the following conditions:

该机制在以下条件下受支持：

- When N19 is used, there is a full mesh of N19 tunnels between UPFs serving the 5G VN group;

-当使用N19时，在为5G VN组提供服务的UPF之间存在N19隧道的全互联拓扑；

- There is no support of forwarding packets with destination MAC address not known by SMF/UPF (i.e. no support for new UE MAC addresses from the UE during the PDU Session lifetime)

-不支持转发SMF/UPF不知道目标MAC地址的数据包（即，在PDU Session生存期内不支持来自UE的新UE MAC地址）

- There is no support for forwarding a broadcast/multicast packet with source address not known to SMF/UPF.

-不支持转发源地址为SMF/UPF未知的广播/多播数据包。

- Each UPF supports one N6 interface instance towards the data network, or only supports N19-based forwarding without N6;

-每个UPF支持一个面向数据网络的N6接口实例，或者只支持基于N19的转发，不支持N6；

- Multicast group formation of selected members of a 5G VN for Ethernet type data communication is not described in this release of the specification.

-本规范版本中未描述用于Ethernet类型数据通信的5G VN的选定成员的多播组形成。

In this case, when the UPF receives a broadcast packet of a 5G VN group from N19 or N6, it shall distribute it to all 5G VN group members connected to this UPF. When the UPF receives a broadcast packet from a UE (source UE) via PDU Session associated with a 5G VN group, it shall distribute it to:

在这种情况下，当UPF从N19或N6接收到5G VN组的广播数据包时，它应将其分发给连接到此UPF的所有5G VN组成员。当UPF通过与5G VN组相关联的PDU Session从UE（源UE）接收广播分组时，它应将其分发给：

- All 5G VN group members (except the source UE) connected to this UPF via local switch, and

-通过本地交换连接到此UPF的所有5G VN组成员（源UE除外），以及

- All 5G VN group members connected to other UPFs via N19-based forwarding, and

-通过基于N19的转发连接到其他UPF的所有5G VN组成员，以及

- The devices on the DN via N6-based forwarding.

-DN上的基于N6转发的设备。

To enable broadcast traffic forwarding of a 5G VN group in a UPF, the following applies:

要在UPF中启用5G VN组的广播流量转发，请执行以下操作：

- The SMF provides group-level N4 Session and each 5G VN group member' N4 Session with the PDR that detect the broadcast packet sent via "internal interface". When UPF receives the broadcast packets sent via "internal interface", it matches the broadcast packet against all PDRs installed at the "internal interface". A successful matching with a PDR that detect the broadcast packet instructs the UPF to continue the lookup of the other PDRs. A matching PDR that detects the broadcast packet shall instruct the UPF to duplicate the broadcast packet and perform processing (using associated FAR, URR, QER) on the copy instead of the original packet if the broadcast packet does not satisfy the packet replication skip information, otherwise the PDR instructs the UPF to skip the processing of the broadcast packet.

-SMF向PDR提供组级N4会话和每个5G VN组成员的N4 Session，PDR检测通过“internal interface”发送的广播数据包。当UPF接收到通过“internal interface”发送的广播数据包时，它将广播数据包与安装在“internal interface”上的所有PDR相匹配。与检测广播分组的PDR的成功匹配指示UPF继续查找其他PDR。如果广播包不满足包复制跳过信息，检测广播包的匹配PDR应指示UPF复制广播包，并对副本而不是原始包执行处理（使用相关的FAR、URR、QER），否则PDR指示UPF跳过对广播分组的处理。

- The broadcast packets received from N19 or N6 are forwarded to the UPF internal interface together with a N19 or N6 indication.

-从N19或N6接收的广播数据包连同N19或N6指示一起转发到UPF内部接口。

- The SMF provides for each 5G VN group member' N4 Session (i.e. N4 session corresponding to PDU Session) the following N4 rules that enable the processing of broadcast packets towards this UE.

-SMF为每个5G VN组成员的N4 Session（即，与PDU Session相对应的N4会话）提供以下N4规则，这些规则支持对该UE的广播分组的处理。

- in order to detect the traffic, a PDR containing Source Interface set to "5G VN internal", Destination Address set to the broadcast address, the Packet replication skip information set to the IP/MAC address (es) of this 5G VN group member, and the indication to carry on matching; and

-为了检测流量，一个PDR，其Source Interface设置为“5G VN internal”、Destination Address设置为广播地址、Packet replication skip information设置为该5G VN组成员的IP/MAC地址以及进行匹配的指示；和

- in order to forward the traffic, a FAR containing Outer Header Creation indicating the PDU Session tunnel information, and Destination Interface set "access side".

-为了转发流量，一个FAR，其Outer Header Creation指示PDU Session隧道信息，并且Destination Interface设置为“access side”。

- The SMF configures the group-level N4 Session for processing packets received from a N19 tunnel with the following N4 rules for each N19 tunnel.

-SMF将组级N4 Session配置为处理从N19隧道接收的数据包，每个N19隧道使用以下N4规则。

- in order to detect the traffic, a PDR containing Source Interface set to "core side", Destination Address set to the broadcast address, and CN Tunnel Information set to N19 tunnel header (i.e. N19 GTP-U TEID); and

-为了检测流量，一个PDR，其Source Interface设置为“core side”、Destination Address设置为广播地址以及CN Tunnel Information设置为N19隧道报头（即N19 GTP-U TEID）；且

- in order to forward the traffic, a FAR containing Destination Interface set to "5G VN internal", Outer Header Creation with the N19 indication.

-为了转发流量，一个FAR，其Destination Interface设置为“5G VN internal”，Outer Header Creation携带N19指示。

- The SMF provides for the group-level N4 Session the following N4 rules that enable the processing of broadcast packets towards the other UPFs.

-SMF为组级N4 Session提供以下N4规则，以支持对发往其他UPF的广播数据包的处理。

- in order to detect the traffic, a PDR containing Source Interface set to "5G VN internal", Destination Address set to the broadcast address, the Packet replication skip information set to the N19 indication, and the indication to carry on matching; and

-为了检测流量，一个PDR，其Source Interface设置为“5G VN internal”、Destination Addres设置为广播地址、Packet replication skip information设置为N19指示以及进行匹配的指示；且

- in order to forward the traffic to each involved UPF via the corresponding N19 tunnel, a FAR containing "Duplication" instruction, Outer Header Creation indicating the N19 tunnel information, Destination Interface set to "core side".

-为了通过相应的N19隧道将流量转发到每个涉及的UPF，一个FAR，其包含“复制”指令、Outer Header Creation指示N19隧道信息、Destination Interface设置为“core side”。

- The SMF configures the group-level N4 Session for processing packets received from N6 with the following N4 rules.

-SMF将组级N4 Session配置为使用以下N4规则处理从N6接收的数据包。

- in order to detect the traffic, a PDR containing Source Interface set to "core side", and Destination Address set to the broadcast address; and

-为了检测流量，一个PDR，其Source Interface设置为“core side”，Destination Address设置为广播地址；且

- in order to forward the traffic, a FAR containing Destination Interface set to "5G VN internal", Outer Header Creation with the N6 indication.

-为了转发流量将包含FAR的目的地接口设置为“5G VN internal”，Outer Header Creation带有N6指示。

- The SMF provides for the group-level N4 Session the following N4 rules that enable the processing of broadcast packets towards N6.

-SMF为组级N4 Session提供以下N4规则，以支持对N6的广播数据包的处理。

- in order to detect the traffic, a PDR containing Source Interface set to "5G VN internal", a match-all packet filter, and the Packet replication skip information set to the N6 indication; and

-为了检测流量，一个PDR，其Source Interface设置为“5G VN internal”、packet filter匹配所有以及Packet replication skip information设置为N6指示；且

- in order to forward the traffic to N6, a FAR containing Destination Interface set to "core side".

-为了将流量转发到N6，一个FAR，其Destination Interface设置为“core side”。

In this case, to enable multicast traffic forwarding of a 5G VN group in a UPF, broadcast traffic forwarding of a 5G VN applies to multicast traffic forwarding of a 5G VN with the following modifications:

在这种情况下，为了在UPF中启用5G VN组的多播流量转发，5G VN的广播流量转发通过以下修改应用于5G VN的多播流量转发：

- The SMF installs PDRs for the multicast address instead of the broadcast address.

-SMF为多播地址而不是广播地址安装PDR。

- The PDRs and FARs are installed for PDU Sessions corresponding to the members of the multicast group.

-PDR和FAR安装用于与多播组成员相对应的PDU Session。

- In addition, the SMF installs the PDR identifying IGMP/MLD signalling for each 5G VN group member' N4 Session and a URR with a Reporting Trigger set to "IGMP reporting" for IGMP or set to "MLD reporting" for MLD. Based on the IP Multicast address in "IP multicast join" or "IP multicast leave" reports received from UPF, the SMF manipulates (delete or add) the PDR identifying the multicast traffic for the reported IP Multicast address at the corresponding 5G VN group member' N4 Session, and if required at the group-level N4 Session at the UPF(s) of the 5G VN group.

-此外，SMF为每个5G VN组成员的N4 Session安装识别IGMP/MLD信令的PDR，并安装一个URR，其中IGMP的Reporting Trigger设置为“IGMP reporting”，MLD的Reporting Trigger设置为“MLD reporting”。基于从UPF接收的“IP multicast join”或“IP multicast leave”报告中的IP Multicast地址，SMF操纵（删除或添加）PDR，该PDR识别相应5G VN组成员N4 Session中报告的IP Multicast地址的多播流量，如果需要，在5G VN组的UPF的组级N4会话中进行。