3GPP 23.501 v20.2.0 — the document's own text
5.8.5.8 Multi-Access Rule
Taught in 13. Where the packets actually go (The 5G system architecture, in depth), 5. The connection, and what is promised on it (The 5G system architecture, overview).
The following table describes the Multi-Access Rule (MAR) that includes the association to the two FARs for both 3GPP access and non-3GPP access in the case of supporting ATSSS.
Table 5.8.5.8-1: Attributes within Multi-Access Rule
| Attribute | Description | Comment | |
|---|---|---|---|
| N4 Session ID | Identifies the N4 session associated to this MAR. | ||
| Rule ID | Unique identifier to identify this rule. | ||
| Steering functionality(NOTE 5) | Indicates the applicable traffic steering functionality:Values "MPTCP functionality", "ATSSS-LL functionality", "MPQUIC-UDP functionality", "MPQUIC-IP functionality", "MPQUIC-E functionality". | ||
| Transport Mode | Identifies the transport mode (see clause 5.32.6.2.2.1) that should be used for the matching traffic, when the Steering functionality is the MPQUIC-UDP functionality, the MPQUIC-IP functionality, or the MPQUIC-E functionality. | The Transport Mode shall be included only when the Steering Functionality is the MPQUIC-UDP functionality, the MPQUIC-IP functionality or the MPQUIC-E functionality. In all other cases, the Transport Mode shall not be included. | |
| Steering mode(NOTE 5) | Values "Active-Standby", "Smallest Delay", "Load Balancing", or "Priority-based" or "Redundant". | ||
| Steering Mode Indicator(NOTE 4) | Indicates either autonomous load-balance operation or UE-assistance operation if steering mode is set to "Load Balancing". | ||
| Threshold values(NOTE 3, NOTE 4) | A Maximum RTT and/or a Maximum Packet Loss Rate | The Threshold Values are applied by UPF as described in clause 5.32.8. | |
| Per-Access Forwarding | Forwarding Action Rule ID | The Forwarding Action Rule ID identifies a forwarding action that has to be applied. | |
| Action information | Weight | Identifies the weight for the FAR if steering mode is "Load Balancing" | The weights for all FARs need to sum up to 100 |
| (NOTE 1)(NOTE 2) | Priority | Values "Active or Standby" or "High or Low" for the FAR | "Active or Standby" for "Active-Standby" steering mode and "High or Low" for "Priority-based" steering mode |
| List of Usage Reporting Rule ID(s) | Every Usage Reporting Rule ID identifies a measurement action that has to be applied. | This enables the SMF to request separate usage reports for different FARs (i.e. different accesses) | |
| NOTE 1: The Per-Access Forwarding Action information is provided per access type (i.e. 3GPP access or Non-3GPP access).NOTE 2: The Weight is treated as the default percentages if the Autonomous operation is allowed for the "Load Balancing" steering mode.NOTE 3: The Threshold Values may be provided when the Steering Mode is Priority-based, or when the Steering Mode is Load-Balancing with fixed split percentages or when the Steering Mode is "Redundant". If the Steering Mode is "Redundant", either a Maximum RTT or a Maximum Packet Loss Rate may be provided, but not both.NOTE 4: The Steering Mode Indicator and the Threshold Values shall not be provided together.NOTE 5: The Steering functionality "ATSSS-LL functionality" shall not be provided together with Steering Mode "Redundant". |