4.6.3.0 General

In order to enable PDU transmission in a network slice, the UE may request establishment of a PDU session in a network slice towards a data network (DN) which is associated with an S-NSSAI and a data network name (DNN) if there is no established PDU session adequate for the PDU transmission. The S-NSSAI included is part of allowed NSSAI of the serving PLMN or SNPN, which is an S-NSSAI value valid in the serving PLMN or SNPN, and the mapped S-NSSAI is also included for the PDU session if it was provided by the network. See clause 6.4.1 for further details. The UE determines whether to establish a new PDU session or use one of the established PDU session(s) based on the URSP rules which include S-NSSAIs, if any (see clause 6.2.9), or based on UE local configuration, as described in clause 4.2.2 of 3GPP TS 24.526 [19].