Section: 4.6.3.3 Session management based network slice data rate limitation control
Content: A serving PLMN or the HPLMN can perform network slice data rate limitation control for the S-NSSAI(s) subject to network slice data rate limitation control to monitor and control the total data rate of established PDU sessions per network slice as specified in 3GPP TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [10]. If the maximum data rate of PDU sessions on a network slice associated with an S-NSSAI has been exceeded during the PDU session establishment procedure, the SMF may reject the PDU session establishment request using S-NSSAI based congestion control as specified in subclause 6.2.8 and 6.4.1.4.2. A serving PLMN or the HPLMN can perform management of Slice-Maximum Bit Rate per UE (UE-Slice-MBR) as specified in 3GPP TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [10]. When the UE-Slice-MBR for the UE and S-NSSAI to which the PDU session is allocated is exceeded during the PDU session establishment procedure, the SMF may reject the PDU session establishment request using S-NSSAI based congestion control as specified in subclause 6.2.8 and 6.4.1.4.2. NOTE 1: Based on operator policy, the network slice data rate limitation control can be not applicable for the S-NSSAI(s) used for emergency services or priority services. NOTE 2: The network slice data rate limitation control and UE-Slice-MBR management are performed by the PCF.