de aware or configured with privacy considerations that apply to NSSAI. The UE must not include NSSAI in NAS signaling or unprotected RRC signaling unless it has a NAS security context setup [3]. References 3GPP Specifications [1] 3GPP TS 23.214, Architecture enhancements for control and user plane separation of EPC nodes, Stage 2 (Release 15), September 2017. [2] 3GPP TS 23.402, Architecture enhancements for non-3GPP accesses (Release 15), March 2018. [3] 3GPP TS 23.501, System architecture for the 5G system (Release 15), December 2018. [4] 3GPP TS 23.502, Procedures for the 5G system (Release 15), April 2019. [5] 3GPP TR 23.714, Study on control and user plane separation of EPC nodes (Release 14), June 2016. [6] 3GPP TR 23.799, Study on architecture for next generation system (Release 14), December 2016. [7] 3GPP TR 28.801, Study on management and orchestration of network slicing for next generation network (Release 15), January 2018. [8] 3GPP TS 29.244, Interface between the control plane and the user plane of EPC nodes, Stage 3 (Release 15), March 2019. [9] 3GPP TS 33.501, Security architecture and procedures for 5G system (Release 15), December 2018. [10] 3GPP TR 33.899, Study on the security aspects of the next generation system (Release 14), August 2017. 3GPP specifications can be accessed at the following URL: http://www.3gpp.org/ftp/Specs/archive/ Chapter 1 [11] 3GPP TS 36.104, Evolved universal terrestrial radio access (E-UTRA), Base Station (BS) Radio Transmission and Reception (Release 15), June 2018. [12] 3GPP TR 36.932, Scenarios and requirements for small cell enhancements for E-UTRA and E-UTRAN (Release 14), March 2017. 3GPP TS 37.340, Multi-connectivity, Stage 2 (Release 15), January 2018. [14] 3GPP TS 38.104, NR; base station (BS) radio transmission and reception (Release 15), January 2018. 3GPP TS 38.401, NG-RAN, architecture description (Release 15), December 2018. [16] 3GPP TS 38.300 NR, Overall description, Stage-2 (Release 15), December 2018. [17] 3GPP TS 38.410 NG-RAN, NG general aspects a