5G PUSCH resource allocation at gNB for multiple UEs in Random Access procedure

RAN
1

Hi Experts,

As specified by 3gpp specifications, the initial access process is a random access procedure. The first step is to transmit a preamble over the PRACH occasion. If the base station successfully decodes the preamble, it will allocate the uplink PUSCH resource to the UE.

In the time domain, the PRACH occasion occurs periodically. My question is: suppose that UE1 transmits its preamble over a PRACH occasion, and UE2 transmits its preamble over the next PRACH occasion; if the based station has allocated the PUSCH resource to UE1 but has no other PUSCH resources to UE2, will the base station response Msg2 to UE2? Or what message will UE2 receive?

2

For random access procedure, BS only allocate little resource to the UE. And resource allocated to UE1 and UE2 may be different in time and/or frequency domain.