5.3 Sidelink model

38.2023GPPNRRelease 16Services provided by the physical layerTS

5.3.1 Sidelink shared channel

The physical-layer model for Sidelink Shared Channel transmission is described based on the corresponding SL-SCH physical-layer-processing chain, see Figure 5.3.1-1. 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 5.3.1-1: Physical-layer model for SL-SCH transmission

5.3.2 Broadcast channel

The physical-layer model for Sidelink Broadcast Channel transmission is characterized by a fixed pre-defined transport format. There is one transport block for every slot in which the UE transmits SL-BCH, if the UE is configured to transmit on SL-BCH. The SL-BCH physical-layer model is described based on the corresponding SL-BCH physical-layer-processing chain, see Figure 5.3.2-1:

– 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.

Figure 5.3.2-1: Physical-layer model for SL-BCH transmission