5.7.2.6 Aggregate Bit Rates

Each PDU Session of a UE is associated with the following aggregate rate limit QoS parameter:

• per Session Aggregate Maximum Bit Rate (Session-AMBR).

The Session-AMBR is signalled to the appropriate UPF entity/ies to the UE and to the (R)AN (to enable the calculation of the UE-AMBR). The Session-AMBR limits the aggregate bit rate that can be expected to be provided across all Non-GBR QoS Flows for a specific PDU Session. The Session-AMBR is measured over an AMBR averaging window which is a standardized value. The Session-AMBR is not applicable to GBR QoS Flows.

Each UE is associated with the following aggregate rate limit QoS parameter:

• per UE Aggregate Maximum Bit Rate (UE-AMBR).

The UE-AMBR limits the aggregate bit rate that can be expected to be provided across all Non-GBR QoS Flows of a UE. Each (R)AN shall set its UE-AMBR to the sum of the Session-AMBR of all PDU Sessions with active user plane to this (R)AN up to the value of the UE-AMBR received from AMF. The UE-AMBR is a parameter provided to the (R)AN by the AMF based on the value of the subscribed UE-AMBR retrieved from UDM or the dynamic serving network UE-AMBR retrieved from PCF (e.g. for roaming subscriber). The AMF provides the UE-AMBR provided by PCF to (R)AN if available. The UE-AMBR is measured over an AMBR averaging window which is a standardized value. The UE-AMBR is not applicable to GBR QoS Flows.

Each group of PDU Sessions of the UE for the same slice (S-NSSAI) may be associated with the following aggregate rate limit QoS parameter:

• per UE per Slice-Maximum Bit Rate (UE-Slice-MBR).

The UE-Slice-MBR limits the aggregate bit rate that can be expected to be provided across all GBR and Non-GBR QoS Flows corresponding to PDU Sessions of the UE for the same slice (S-NSSAI) which have an active user plane. Each supporting NG-RAN shall set its UE-Slice-MBR to the sum of the Session-AMBR and MFBR for GBR QoS Flows of all PDU Sessions corresponding to the slice (S-NSSAI) with active user plane to this NG-RAN up to the value of the UE-Slice-MBR corresponding to the slice (S-NSSAI) received from AMF. The UE-Slice-MBR is measured over an AMBR averaging window which is a standardized value. The UE-Slice-MBR is an optional parameter provided to the NG-RAN by the AMF as described in clause 5.15.13.

NOTE: The AMBR averaging window is only applied to Session-AMBR, UE-AMBR and UE-Slice-MBR measurement and the AMBR averaging windows for Session-AMBR and UE-AMBR are standardised to the same value.