As specified in 3GPP 38.306 (NR User equipment) csi-RS-ForTracking Indicates support of CSI-RS for tracking (i.e. TRS).
Time Reference Signals are used for synchronization purposes within the 5G network. Synchronization is crucial to ensure that different network elements and devices in the 5G system are operating in harmony and can efficiently transmit and receive data.
In a 5G SA network, TRS helps maintain accurate time and frequency synchronization among various base stations (gNBs) and devices (UEs), which is essential for achieving high data transfer rates and minimizing interference.
This capability signalling comprises the following parameters:
- maxBurstLength indicates the TRS burst length. Value 1 indicates 1 slot and value 2 indicates both of 1 slot and 2 slots. In this release (Rel17) UE is mandated to report value 2;
- maxSimultaneousResourceSetsPerCC indicates the maximum number of TRS resource sets per CC which the UE can track simultaneously;
- maxConfiguredResourceSetsPerCC indicates the maximum number of TRS resource sets configured to UE per CC. It is mandated to report at least 8 for FR1 and 16 for FR2;
- maxConfiguredResourceSetsAllCC indicates the maximum number of TRS resource sets configured to UE across CCs. If the UE includes the field in an FR1 band, it shall set the same value in all FR1 bands. If the UE includes the field in an FR2 band, it shall set the same value in all FR2 bands. The UE supports a total number of resources equal to the maximum of the FR1 and FR2 value, but no more than the FR1 value across all FR1 serving cells and no more than the FR2 value across all FR2 serving cells. The UE is mandated to report at least 16 for FR1 and 32 for FR2.