Reverting Layer 1 and/or Layer 2 Triggered Mobility (LTM) Identifier

A wireless device comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

• receive, by a wireless device from a base station, a layer 1 and/or layer 2 triggered mobility (LTM) configuration comprising:
• a first LTM identifier, of a serving cell, for re-establishing a packet data convergence protocol (PDCP) entity and updating a security key;
• and
• an LTM candidate parameter associated with a candidate cell, wherein the LTM candidate parameter comprises:
• a second LTM identifier, of the candidate cell, for re-establishing a packet data convergence protocol (PDCP) entity and updating a security key;
• a physical cell identifier of the candidate cell;
• a LTM candidate configuration of the candidate cell;
• and
• an identifier of the LTM candidate configuration;
• store, based on the LTM configuration comprising the first LTM identifier, the first LTM identifier in a user equipment (UE) variable;
• execute an LTM procedure to the candidate cell;
• in response to executing the LTM procedure, based on a value of the second LTM in the UE variable not being equal to a value of the second LTM identifier:
• re-establish a PDCP entity;
• update a security key of the base station;
• replace the value of the first LTM identifier with the value of the second LTM identifier;
• and
• transmit, to the base station, an RRC reconfiguration complete message comprising an identifier of an LTM candidate configuration.