5G NR cell reference power and SS/PBCH SSS EPRE

  • 5G Base Station determines the downlink transmit EPRE (Energy Per Resource Element).

  • For the Secondary Synchronization Signal (SSS), the downlink SS/PBCH SSS EPRE can be derived from the SS/PBCH downlink transmit power and is provided by ss-PBCH-BlockPower parameter (as higher layer parameter) to the 5G device.

  • π’”π’”βˆ’π‘·π‘©π‘ͺπ‘―βˆ’π‘©π’π’π’„π’Œπ‘·π’π’˜π’†π’“ is the average EPRE of the resources elements that carry secondary synchronization signals in dBm that the NW used for SSB transmission, and UE uses it e.g. to estimate the RA preamble TX power.

  • The downlink CSI-RS EPRE can be derived from the SS/PBCH block downlink transmit power given by the parameter π’”π’”βˆ’π‘·π‘©π‘ͺπ‘―βˆ’ π‘©π’π’π’„π’Œπ‘·π’π’˜π’†π’“ and CSI-RS power offset given by the parameter π‘·π’π’˜π’†π’“π‘ͺ𝒐𝒏𝒕r𝒐𝒍𝑢𝒇𝒇𝒔𝒆𝒕𝑺𝑺 provided by higher layers.

  • Here I try to depict how EPRE(dBm, per Tx branch) is calculated as the cell reference power. The 𝑺𝑺/𝑷𝑩π‘ͺ𝑯 𝑺𝑺𝑺 𝑬𝑷𝑹𝑬(π’”π’”βˆ’π‘·π‘©π‘ͺπ‘―βˆ’ π‘©π’π’π’„π’Œπ‘·π’π’˜π’†π’“) is then calculated using the cell reference power.

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