L.1 Introduction

31.1023GPPCharacteristics of the Universal Subscriber Identity Module (USIM) applicationRelease 17TS

USIM-RN and USIM-INI are used for Relay Node network connections establishment.

USIM-INI, if present on the UICC, and USIM-RN include at least all mandatory files defined for a USIM in the present document, with the exception of files related to emergency calls.

Editor’s note: It is FFS whether the list of files mandatory to support can be reduced further.

USIM-INI is only required in case of a certificate based solution as described in TS 33.401 [52].

For the certificate-based solution, the UICC shall support BIP-UICC server mode (see TS 31.111 [12]) and may support the Inter-Chip USB UICC/terminal interface (see TS 31.101 [11]) to perform the TLS handshake.

The USIM-RN is used to ensure a one to one binding with the Relay Node. The security architecture for Relay Nodes is defined in TS 33.401 [52].