Transmission and access with multiple transmission reception points

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:
• receive configuration parameters, of a cell, indicating:
• a first reference signal (RS) of a first transmission reception point (TRP) of the cell;
• a second RS of a second TRP of the cell;
• random access channel (RACH) resources of a RACH of the cell;
• and
• a power offset value for the first TRP;
• measure:
• a first received power value of the first RS;
• and
• a second received power value of the second RS;
• select, after adjusting the first received power value by the power offset value, an RS from the first RS and the second RS;
• and
• transmit a preamble, to a TRP associated with the RS from among the first TRP and the second TRP, via the RACH resources.

A system comprising:

• a base station comprising:
• one or more first processors;
• and
• first memory storing first instructions that, when executed by the one or more first processors, cause the base station to:
• transmit configuration parameters of a cell, the configurations parameters indicating:
• a first reference signal (RS) of a first transmission reception point (TRP) of the cell;
• a second RS of a second TRP of the cell;
• random access channel (RACH) resources of a RACH of the cell;
• and
• a power offset value for the first TRP;
• and
• a wireless device comprising:
• one or more second processors;
• and
• second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:
• receive, from the base station, the configuration parameters;
• measure:
• a first received power value of the first RS;
• and
• a second received power value of the second RS;
• select, after adjusting the first received power value by the power offset value, an RS from the first RS and the second RS;
• and
• transmit a preamble, to a TRP of the base station associated with the RS from the first TRP and the second TRP, via the RACH resources.