Conditional handover execution

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:
• transmit, to a first base station, a measurement report comprising a measurement result of a cell of a second base station;
• receive, from the first base station and based on the measurement report, a radio resource control message indicating a command of a conditional handover towards the cell of the second base station, wherein the radio resource control message comprises:
• a cell identifier of the cell;
• and
• at least one handover execution condition, wherein the at least one handover execution condition comprises at least one of:
• a reference signal received power;
• a reference signal received quality;
• a first time value indicating a time offset for a decision of a handover execution;
• or
• a second time value indicating a time duration when the command of the conditional handover is valid;
• determine that at least one criteria of the at least one handover execution condition is met by the cell of the second base station;
• and
• transmit, to the first base station and in response to the determining that the at least one criteria is met, a first signal indicating a handover execution notification associated with the command of the conditional handover, the handover execution notification indicating that the wireless device is initiating a random access procedure by transmitting a random access preamble via the cell of the second base station.

A method comprising:

• receiving, by a first base station from a wireless device, a measurement report comprising a measurement result of a cell of a second base station;
• transmitting, by the first base station to the wireless device and based on the measurement report, a radio resource control message indicating a command of a conditional handover towards the cell of the second base station, wherein the radio resource control message comprises:
• a cell identifier of the cell;
• and
• at least one handover execution condition, wherein the at least one handover execution condition comprises at least one of:
• a reference signal received power;
• a reference signal received quality;
• a first time value indicating a time offset for a decision of a handover execution;
• or
• a second time value indicating a time duration when the command of the conditional handover is valid;
• receiving, by the first base station from the wireless device, a first signal indicating a handover execution notification associated with the command of the conditional handover, wherein the handover execution notification indicates that the wireless device is initiating a random access procedure, based on the cell meeting at least one criteria of the at least one handover execution condition, by transmitting a random access preamble via the cell;
• and
• suspending transmitting downlink packets to the wireless device via a radio interface in response to receiving the handover execution notification.