In LTE, those reference signal for the measurement are synchronization signal and/or CRS(Cell Specific Reference signal). For every measurement process, the physical entities to measure is some kind of reference signal. The first step for the measurement process is to determine 'what to measure ?'. I would suggest you to make practice of understanding some big picture of the overall structure before digging into each individual element. Measurement process is configured by a very complicated (probably the most complicated RRC configuration) and confusing RRC parameters. Overall Structure of Measurement Item and Configuration Overall Structure of Measurement Item and Configuration.You would need to go back and forth many times between this page and following pages. To measurement report, refer to following pages. It means you need to do a lot of study on lower layer process to fully understand the details of this higher layer process and parameters that will be explained in this page.

The topics I will describe in this page is higher level measurement(i.e, RRC layer measurement), but this higher layer measurement is based on very complicated lower layer process.

5g rsrp