9 Electrical characteristics and transmission protocols
21.1113GPPRelease 17TSUSIM and IC card requirements
Electronic signals and transmission protocols shall be in accordance with the specifications in 3GPP TS 31.101 [3].
The electrical specifications shall at least cover the 1.8V and 3V voltage ranges as specified in 3GPP TS 31.101 [3]. Lower voltages may be added in the future. 3G terminals and beyond shall not support 5V on the ME-UICC interface. Both ME and UICC shall support operational class indication as defined in ISO/IEC 7816-3 [11].
UICC shall support at least two consecutive voltage classes unless it has a non removable form factor. ME shall support at least two consecutive voltage classes, unless it contains a non-removable UICC or unless it supports any of the following, or a combination of: NB-IoT, GERAN EC-GSM-IoT, Category M1 of E-UTRAN enhanced-MTC and Category 1bis as specified in 3GPP TS 36.306 [14].
An ME supporting NG-RAN and containing a removable UICC shall support at least the 1.8V voltage class, and may support a second, consecutive voltage class.
Both UICC and ME shall support PPS as defined in ISO/IEC 7816-3 [11] with at least the values defined in 3GPP TS 31.101 [3].
The ME shall have the capabilities of initiating a warm reset as defined in ISO/IEC 7816-3 [11]. The UICC shall support warm reset as defined in ISO/IEC 7816-3 [11].
NOTE2: The warm reset is used during a session when there is a need to restart the USIM due to internal modifications of data caused by user actions or network data downloading.
The UICC may indicate in the ATR to the warm reset that the specific mode is entered automatically, using the parameters that were used prior to the warm reset. In case of a cold reset, the UICC shall enter the negotiable mode.
In addition to the T=0 protocol which is mandatory for the UICC and the ME, the T=1 protocol shall be mandatory for the ME. It is optional for the UICC.
The speed enhancement as specified in 3GPP TS 31.101 [3] shall be supported by both the ME and the UICC.