Random access procedure based on CSI-RS selection

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 base station, at least one first measurement report of at least one synchronization signal of a cell;
• receive, from the base station, an indication of one or more channel state information reference signals (CSI-RSs), of the cell, based on:
• the at least one first measurement report;
• and
• a first antenna port of the one or more CSI-RSs being quasi-collocated with a second port of the at least one synchronization signal;
• transmit, based on the indication, at least one second measurement report of the one or more CSI-RSs;
• and
• receive, based on the at least one second measurement report, a downlink control information initiating a random access procedure of the cell based on at least one first CSI-RS from the one or more CSI-RSs.

A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:

• transmit, to a base station, at least one first measurement report of at least one synchronization signal of a cell;
• receive, from the base station, an indication of one or more channel state information reference signals (CSI-RSs), of the cell, based on:
• the at least one first measurement report;
• and
• a first antenna port of the one or more CSI-RSs being quasi-collocated with a second port of the at least one synchronization signal;
• transmit, based on the indication, at least one second measurement report of the one or more CSI-RSs;
• and
• receive, based on the at least one second measurement report, a downlink control information initiating a random access procedure of the cell based on at least one first CSI-RS from the one or more CSI-RSs.