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.