oexistence. For a color version of this figure, see www.iste.co.uk/launay/5g.zip 5G-NR Radio Interface - Operations on the Frequency Bands The uplink radio channel (SUL or not SUL) is controlled by the radio node to avoid transmission of the PUSCH physical channel or the PUCCH physical channel on both SUL and non-SUL radio channels simultaneously. The random access procedure (see Chapter 4), allowing the radio connection between the mobile and the base station, can be performed on any of the two bands. The selection of the SUL or non-SUL channel for the initial access is imposed by the radio node or selected by the mobile by comparing the power of the downlink signal to a power threshold. The sul-RSRP-Threshold power threshold value is transmitted by the broadcast signal SIB1 (Signal Information Block) in the servingCellConfigCommon data structure. The SUL channel can supplement the carrier aggregation technique. It is possible to add an SUL channel on the primary PCell or secondary SCell. 5.5. References All standards can be downloaded from the ETSI website: https://www.etsi.org/ standards. 3GPP TR 38.716-01-01 Technical Specification Group Radio Access Networks; NR intra band Carrier Aggregation (CA) Rel-16 for xCC Down Link (DL)/yCC Up Link (UL) including contiguous and non-contiguous spectrum (x >=y) Version 16.0.0 Release 16 3GPP TS 38.101-01 NR - User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone Version 16.4.0 Release 16 3GPP TS 38.101-02 NR - User Equipment (UE) radio transmission and reception; Part 2: Range 2 Standalone Version 16.4.0 Release 16 3GPP TS 38.104 NR - Base Station (BS) radio transmission and reception; Version 16.4.0 Release 16 3GPP TR 38.133 NR - Requirements for support of radio resource management; Version 16.4.0 Release 16 NG-RAN and 5G-NR 3GPP TR 38.321 NR - Medium Access Control (MAC); Version 16.4.0 Release 16 3GPP TR 38.331 NR - Radio Resource Control (RRC); Version 15.2.1 Release 15 Ericsson (2020). Carrier aggregation in 5G [Online]. Available at: ht