8.2.26 Apply Action
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
The Apply Action IE indicates the action(s) the UP function is required to apply to packets. It is coded as shown in Figure 8.2.26-1.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 to 2 |
Type = 44 (decimal) |
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3 to 4 |
Length = n |
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5 |
DFRT |
IPMD |
IPMA |
DUPL |
NOCP |
BUFF |
FORW |
DROP |
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6 |
Spare |
MBSU |
FSSM |
DDPN |
BDPN |
EDRT |
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7 to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.2.26-1: Apply Action
The octet 5 shall be encoded as follows:
– Bit 1 – DROP (Drop): when set to "1", this indicates a request to drop the packets.
– Bit 2 – FORW (Forward): when set to "1", this indicates a request to forward the packets.
– Bit 3 – BUFF (Buffer): when set to "1", this indicates a request to buffer the packets.
– Bit 4 – NOCP (Notify the CP function): when set to "1", this indicates a request to notify the CP function about the arrival of a first downlink packet being buffered.
– Bit 5 – DUPL (Duplicate): when set to "1", this indicates a request to duplicate the packets.
– Bit 6 – IPMA (IP Multicast Accept): when set to "1", this indicates a request to accept UE requests to join an IP multicast group.
– Bit 7 – IPMD (IP Multicast Deny): when set to "1", this indicates a request to deny UE requests to join an IP multicast group.
– Bit 8 – DFRT (Duplicate for Redundant Transmission): when set to "1", this indicates a request to duplicate the packets for redundant transmission (see clause 5.24.2).
The octet 6 shall be encoded as follows:
– Bit 1 – EDRT (Eliminate Duplicate Packets for Redundant Transmission): when set to "1", this indicates a request to eliminate duplicate packets used for redundant transmission (see clause 5.24.2).
– Bit 2 – BDPN (Buffered Downlink Packet Notification): when set to "1", this indicates a request to notify the CP function about the first buffered DL packet for downlink data delivery status notification.
– Bit 3 – DDPN (Discarded Downlink Packet Notification): when set to "1", this indicates a request to notify the CP function about the first discarded DL packet for downlink data delivery status notification if the DL Buffering Duration or DL Buffering Suggested Packet Count is exceeded or it is discarded directly. See clause 5.2.3.1.
– Bit 4 – FSSM (Forward packets to lower layer SSM): when set to "1", this indicates a request to the MB-UPF to forward MBS session data towards a low layer SSM address allocated by the MB-UPF using multicast transport.
– Bit 5 – MBSU (Forward and replicate MBS data using Unicast transport): when set to "1", this indicates a request to forward and replicate MBS session data towards multiple remote GTP-U peers using unicast transport.
– Bit 6 to 8 – Spare, for future use and seto to "0".
One and only one of the DROP, FORW, BUFF, IPMA and IPMD flags shall be set to "1".
The NOCP flag and BDPN flag may only be set if the BUFF flag is set.
The DUPL flag may be set with any of the DROP, FORW, BUFF and NOCP flags.
The DFRN flag may only be set if the FORW flag is set.
The EDRT flag may be set if the FORW flag is set.
The DDPN flag may be set with any of the DROP and BUFF flags.
Both the MBSU flag and the FSSM flag may be set (to require the MB-UPF to forward MBS session data using both multicast and unicast transports).