Handover random access

A method comprising:

• receiving, by a base station associated with a first cell and from a wireless device, a first message comprising a measurement report;
• transmitting, to a computing device, a second message comprising an indication of a handover to a second cell;
• receiving, from the computing device, a third message associated with a type of a random access procedure for the handover;
• and
• transmitting, to the wireless device, a fourth message that comprises one or more parameters associated with the type of the random access procedure.

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 perform:
• transmitting, to a base station associated with a first cell, a first message comprising a measurement report;
• receiving, from the base station, a second message comprising a command for a handover to a second cell, wherein the second message comprises one or more parameters associated with a type of a random access procedure for the handover;
• and
• transmitting, for the handover to the second cell, a random access preamble employing the type of the random access procedure.

A base station comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the base station to perform:
• receiving, from a wireless device, a first message comprising a measurement report, wherein the base station is associated with a first cell;
• transmitting, to a computing device, a second message comprising an indication of a handover to a second cell;
• receiving, from the computing device, a third message associated with a type of a random access procedure for the handover;
• and
• transmitting, to the wireless device, a fourth message that comprises one or more parameters associated with the type of the random access procedure.

A computing device comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the computing device to perform:
• receiving, from a base station associated with a first cell, a first message comprising an indication for a handover of a wireless device to a second cell;
• and
• transmitting, to the base station, a second message associated with a type of a random access procedure for the handover of the wireless device.

A non-transitory computer-readable medium storing instructions that, when executed, configure a wireless device to perform:

• transmitting, to a base station associated with a first cell, a first message comprising a measurement report;
• receiving, by the wireless device and from the base station, a second message comprising a command for a handover to a second cell, wherein the second message comprises one or more parameters associated with a type of a random access procedure for the handover;
• and
• transmitting, by the wireless device and for the handover to the second cell, a random access preamble employing the type of the random access procedure.

A non-transitory computer-readable medium storing instructions that, when executed, configure a base station to perform:

• receiving, from a wireless device, a first message comprising a measurement report, wherein the base station is associated with a first cell;
• transmitting, to a computing device, a second message comprising an indication of a handover to a second cell;
• receiving, from the computing device, a third message associated with a type of a random access procedure for the handover;
• and
• transmitting, to the wireless device, a fourth message that comprises one or more parameters associated with the type of the random access procedure.

A system comprising:

• a wireless device comprising:
• one or more processors;
• and
• memory storing instructions;
• and
• a base station associated with a first cell, the base station comprising:
• one or more processors;
• and
• memory storing instructions,
• wherein the instructions stored in the memory of the wireless device, when executed by the one or more processors of the wireless device, cause the wireless device to perform:
• transmitting, to the base station, a first message comprising a measurement report;
• receiving, from the base station, a second message comprising a command for a handover to a second cell, wherein the second message comprises one or more parameters associated with a type of a random access procedure for the handover;
• and
• transmitting, for the handover to the second cell, a random access preamble employing the type of the random access procedure, and
• wherein the instructions stored in the memory of the base station, when executed by the one or more processors of the base station, cause the base station to perform:
• receiving the first message;
• transmitting, to a computing device, a third message comprising an indication of the handover to the second cell;
• receiving, from the computing device, a fourth message associated with the type of the random access procedure for the handover;
• and
• transmitting, to the wireless device, the second message.