Random access response window configuration

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:
• transmit one or more broadcast messages indicating:
• a first time offset for starting a random access response (RAR) window;
• and
• preamble transmission occasions, wherein each of the preamble transmission occasions is associated with a respective synchronization signal (SS)-physical broadcast channel (PBCH) block of SS-PBCH blocks;
• receive, from a wireless device, a preamble transmission via a preamble transmission occasion of the preamble transmission occasions;
• and
• transmit, to the wireless device, an RAR of the preamble transmission during the RAR window that starts from a starting time based on:
• the preamble transmission occasion;
• the first time offset;
• and
• a second time offset.

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:

• receive one or more broadcast messages indicating:
• a first time offset for starting a random access response (RAR) window;
• and
• preamble transmission occasions, wherein each of the preamble transmission occasions is associated with a respective synchronization signal (SS)-physical broadcast channel (PBCH) block of SS-PBCH blocks;
• determine, for a preamble transmission, a preamble transmission occasion of the preamble transmission occasions, wherein the preamble transmission occasion is associated with an SS-PBCH block selected from the SS-PBCH blocks;
• start the RAR window from a starting time based on:
• the preamble transmission occasion;
• the first time offset;
• and
• a second time offset;
• and
• receive, during the RAR window, an RAR of the preamble transmission.