HARQ process in semi-persistent scheduling

A wireless device comprising:

• one or more processors;
• and
• a memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
• receive one or more radio resource control messages comprising first configuration parameters for a first semi-persistent scheduling (SPS), the first configuration parameters indicating:
• a semi-persistent uplink interval;
• a hybrid automatic repeat request (HARQ) process identifier offset;
• and
• a number of uplink semi-persistent HARQ processes;
• receive a downlink control information indicating a resource assignment for the first SPS;
• determine a HARQ process identifier for a current transmission time interval as a sum of the HARQ process identifier offset and a value determined based on:
• the current transmission time interval;
• the semi-persistent uplink interval;
• and
• the number of uplink semi-persistent HARQ processes;
• and
• transmit, employing the resource assignment, a transport block (TB) of the first SPS associated with a HARQ process identified by the HARQ process identifier.