SSB to RO mapping against remote interference

A base station for a cellular communications network comprising processing circuitry configured to cause the base station to:

• measure remote interference on a plurality of beam directions;
• determine a mapping between the plurality of beam directions and Synchronization Signal Block, SSB, index, resulting in a beam direction SSB index mapping, taking into consideration remote interference, wherein determining the mapping between the SSBs and the plurality of beam directions comprises performing the mapping between the SSBs and the plurality of beam directions such that one or more of the SSBs that correspond to Physical Random Access Channel, PRACH, occasions that are resistant to remote interference are mapped to one or more beam directions having a predefined level of remote interference, respectively;
• and
• use the beam direction to SSB index mapping.

A wireless device comprising:

• one or more transmitters;
• one or more receivers;
• and
• processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry configured to cause the wireless device to:
• detect a Synchronization Signal Block, SSB;
• and
• transmit a Physical Random Access Channel, PRACH, preamble on a PRACH occasion mapped to the detected SSB, where a mapping between an SSB index and transmit beam directions performed by a respective base station is defined taking remote interference into consideration such that one or more SSBs of the SSB index that correspond to PRACH occasions that are resistant to remote interference are mapped to one or more beam directions having a predefined level of remote interference, respectively, wherein the mapping results in a beam direction to SSB index mapping.