5.16 SUL operation

38.3213GPPMedium Access Control (MAC) protocol specificationNRRelease 17TS

The Supplementary UL (SUL) carrier can be configured as a complement to the normal UL (NUL) carrier. Switching between the NUL carrier and the SUL carrier means that the UL transmissions move from one carrier to the other carrier, which is done by:

– an indication in DCI;

– the Random Access procedure as specified in clause 5.1.1;

– the SDT procedure as specified in clause 5.27.

If the MAC entity receives a UL grant indicating an SUL switch while a Random Access procedure is ongoing, the MAC entity shall ignore the UL grant.

The Serving Cell configured with supplementaryUplink belongs to a single TAG.