5G unlink power control works

5G NR
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1

What are the parameters for 5G Uplink parameters power control for PRACH, SRS, PUCCH, PUSCH

2

What is the main difference from 4G power control

3

The parameters are detailed in 3GPP 38.213, as follows:

  • PUSCH: clause 7.1
  • PUCCH: clause 7.2
  • SRS: clause 7.3
  • PRACH: clause 7.4

The main difference from LTE are:

  • For PUSCH/PUCCH/SRS there is now a compensation factor that goes together with the RB allocation and accounts for the numerology used in the transmission;
  • Beam-based power control: 5G is beam-centric and, since the transmission can switch from a beam to another, the UE can keep up to four pathloss estimates (corresponding to different TX-RX beam pairs). This way, when the transmission switches from one beam to another, it already has a PL estimate to start with. Moreover, the UE can also keep two close-loop processes simultaneously (the reason is still unclear to me, but I believe it’s also for support multiple beams).
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