5.1 Uplink model

38.2023GPPNRRelease 17Services provided by the physical layerTS

5.1.1 Uplink shared channel

The physical-layer model for Uplink Shared Channel transmission is described based on the corresponding PUSCH physical-layer-processing chain, see Figure 5.1.1-1. Processing steps that are relevant for the physical-layer model, e.g. in the sense that they are configurable by higher layers, are highlighted in blue.

– Higher-layer data passed to/from the physical layer

– CRC and transport-block-error indication

– FEC and rate matching

– Data modulation

– Mapping to physical resource

– Multi-antenna processing

– Support of L1 control and Hybrid-ARQ-related signalling

Figure 5.1.1-1: Physical-layer model for UL-SCH transmission

5.1.2 Random access channel

The physical-layer model for RACH transmission is characterized by a PRACH preamble format that consists of a cyclic prefix, a preamble, and a guard time during which nothing is transmitted.