![]() SS Block is transmitted over a limited bandwidth but with a much larger periodicity compared to LTE CRS. Why SS Block is not used for channel sounding in 5G NR? Also, CSI-RS is transmitted on different antenna ports (15-22) than CRS and CSI-RS uses code-domain orthogonality along with time/frequency orthogonality unlike CRS which used only time/frequency orthogonality.Īs 5G NR minimizes always on strategy (Except for SS Block), there are no CRS-like signals in NR, but the same concept of CSI-RS is reused and extended in NR to provide support for beam management and mobility in the connected mode. Extending CRS to 8 layers would have added more signaling overhead than desired, resulting in introduction of CSI-RS. In contrast to Cell Specific Reference signal (CRS) from LTE Release 8, LTE release 10 introduced this concept of CSI-RS with the addition of up to 8-layer spatial multiplexing where the Reference Signals are not transmitted continuously, which led to requirement of 8-layer channel estimation while only 4-layer spatial multiplexing was used in LTE Release 8. What is the difference between CSI-RS and CRS?ĬSI-RS is configured per device rather than per cell, as it was in LTE. These are well defined reporting parameters and comprises of: ![]() Channel state information (CSI) is the way of indicating certain reports by the UE to the network. ![]()
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