Apple Inc.
Physical random access channel (PRACH) format configuration

Abstract:

A user equipment (UE) can include processing circuitry configured to decode system information block (SIB) information including a PRACH configuration index. The PRACH configuration index indicates at least a first preamble format and a second preamble format. A PRACH preamble is encoded for transmission to a base station within a PRACH resource indicated by the PRACH configuration index. The PRACH preamble is associated with the first preamble format or the second preamble format. A random access channel response (RAR) message from the base station is decoded. The RAR message includes an uplink grant for scheduling a physical uplink shared channel (PUSCH) transmission. Data is encoded for transmission on the PUSCH based on the uplink grant. The PRACH resource comprises a plurality of PRACH occasions, where the PRACH preamble is transmitted within a PRACH occasion from the plurality of PRACH occasions with a starting symbol indicated by the PRACH configuration index.