Content for  TS 38.202  Word version:  18.0.0

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5  Model of physical layer of the UEp. 6

The 5G-NR physical-layer model captures those characteristics of the 5G-NR physical-layer that are relevant from the point-of-view of higher layers. More specifically, the physical-layer model captures:
  • The structure of higher-layer data being passed down to or up from the physical layer;
  • The means by which higher layers can configure the physical layer;
  • The different indications (error indications, channel-quality indications, etc.) that are provided by the physical layer to higher layers.

5.1  Uplink modelp. 7

5.1.1  Uplink shared channelp. 7

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
Copy of original 3GPP image for 3GPP TS 38.202, Fig. 5.1.1-1: Physical-layer model for UL-SCH transmission

5.1.2  Random access channelp. 7

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.

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