Retransmission of MsgB in two-step random access procedure

An apparatus, comprising:

• at least one processor configured to cause a user equipment (UE) to:
• receive a configuration message from a base station, wherein the configuration message indicates a time duration of a window for monitoring a physical downlink control channel (PDCCH);
• and
• monitor the PDCCH for one or more transmissions of a downlink message, wherein the one or more transmissions of the downlink message are part of a two-step random access procedure;
• decode downlink control information, DCI, in a first of the one or more transmissions of the downlink message within the window using a message B (MSGB) Radio Network Temporary Identity (RNTI), wherein the MSGB-RNTI is based on location parameters of a physical uplink resource that was used by the UE to transmit a random access preamble of the two-step random access procedure;
• and
• determine, based on a field in the decoded DCI that resolves DCI transmissions relating to random access preamble transmissions in different radio frames using a same MSB-RNTI, whether to accept or reject the decoded DCI.

A non-transitory computer readable storage medium storing program instructions executable by one or more processors to cause a user equipment (UE) to:

• receive a configuration message from a base station, wherein the configuration message indicates a time duration of a window for monitoring a physical downlink control channel (PDCCH);
• monitor the PDCCH for one or more transmissions of a downlink message, wherein the one or more transmissions of the downlink message are part of a two-step random access procedure;
• decode downlink control information (DCI) in a first of the one or more transmissions of the downlink message within the window using a message B (MSGB) Radio Network Temporary Identity (RNTI), wherein the MSGB-RNTI is based on location parameters of a physical uplink resource that was used by a user equipment (UE) to transmit a random access preamble of the two-step random access procedure;
• and
• determine, based on a field in the decoded DCI indicating a time sub-window number, that the decoded DCI is intended for the UE.