Aggregation indication for uplink transmission during random access channel procedures

A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a user equipment (UE), the processing circuitry configured to perform a random access procedure comprising:

• configuring the UE for transmission of a random access preamble (Msg1) in a physical random access channel (PRACH);
• configuring the UE for reception of a random access response (RAR) message (Msg2) in response to transmission of the random access preamble (Msg1), the RAR message (Msg2) including an RAR uplink (UL) grant;
• and
• configuring the UE for an initial transmission of a physical uplink shared channel (PUSCH) scheduled by the RAR UL grant,
• wherein for PUSCH repetition Type A that is scheduled by the RAR UL grant, the processing circuitry is to configure the UE to repeat the initial transmission of the PUSCH over a number of slots based on a Msg3 PUSCH repetition number, and
• wherein when the PUSCH repetition Type A that is scheduled by the RAR UL grant, the processing circuitry is configured to determine the Msg3 PUSCH repetition number from two most significant bits in a modulation and coding scheme (MCS) field of the RAR UL grant, the MCS for the PUSCH determined from least-significant bits in the MCS field, and
• wherein when the PUSCH repetition Type A is scheduled by a downlink control information (DCI) format 0_1, the processing circuitry is to configure the UE to repeat the initial transmission of the PUSCH based on a PUSCH aggregation factor received via radio resource control (RRC) signalling.

A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of gNodeB (gNB), wherein to perform a random access procedure with a user equipment (UE), the processing circuitry is configured to:

• decode random access preamble (Msg1) in a physical random access channel (PRACH) from the UE;
• encode a random access response (RAR) message (Msg2) in response to the random access preamble (Msg1), the RAR message (Msg2) including an RAR uplink (UL) grant;
• and
• decode an initial transmission of a physical uplink shared channel (PUSCH) scheduled by the RAR UL grant,
• wherein for PUSCH repetition Type A that is scheduled by the RAR UL grant, the processing circuitry is decode repetitions of the initial transmission of the PUSCH over a number of slots based on a Msg3 PUSCH repetition number, and
• wherein when the PUSCH repetition Type A that is scheduled by the RAR UL grant, the processing circuitry is configured to indicate to the UE the Msg3 PUSCH repetition number in two most significant bits in a modulation and coding scheme (MCS) field of the RAR UL grant, the MCS for the PUSCH determined from the least-significant bits in the MCS field,
• wherein for PUSCH repetition Type A that is scheduled by a downlink control information (DCI) format 0_1, the processing circuitry is to encode radio resource control (RRC) signalling with a PUSCH aggregation factor for transmission to the UE to configure the UE to repeat the initial transmission of the PUSCH, and
• wherein memory is configured to store the random access preamble.