Power Saving Methods for Multi-Subscriber Identity Module Devices

A method, comprising:

• by a user equipment (UE) operating in a multiple-subscriber identity module (MSIM) mode:
• transmitting, using a first radio associated with a first subscriber identity module (SIM), a first registration request to a network node;
• transitioning, based at least in part on performing a successful registration procedure associated with a first cell of the network node, the first SIM to a registered idle state;
• transmitting, using a second radio associated with a second SIM, a second registration request to the network node;
• receiving, using the second radio, a registration reject message from the network node, wherein the registration reject message comprises a registration reject cause code associated with a second cell of the network node;
• barring the second cell;
• and
• performing a cell selection procedure, wherein the second cell is barred from being selected in the cell selection procedure.

An apparatus, comprising:

• at least one processor of a user equipment (UE) operating in a multiple-subscriber identity module (MSIM) mode, wherein the at least one processor is configured to cause the UE to:
• transmit, to a public land mobility network (PLMN) and using a first radio associated with a first subscriber identity module (SIM), a first registration request associated with a first tracking area identifier (TAI);
• receive, using the first radio, a registration reject message from the network node, wherein the registration reject message comprises a registration reject cause code;
• start one or more timers;
• mark the first TAI as forbidden;
• and
• search for a second TAI excluding the first TAI.