This beam pair link thus signifies the best beam-pair at transmit and receive ends for the simulated spatial scenario. The example measures the reference signal received power (RSRP) for each of the transmit-receive beam pairs (in a dual loop) and determines the beam pair link with the maximum RSRP.
This example generates an NR synchronization signal burst, beamforms each of the SSBs within the burst to sweep over both azimuth and elevation directions, transmits this beamformed signal over a spatial scattering channel, and processes this received signal over the multiple receive-end beams. For an example of beam pair refinement, see NR Downlink Transmit-End Beam Refinement Using CSI-RS. In case of beam failure, these pair links can be reestablished. If necessary, the beams are further refined using CSI-RS (for downlink) and SRS (for uplink). Once connected, the same beam pair link can be used for subsequent transmissions. Among the multiple beam management procedures, TR 38.802 defines this dual-end sweep as procedure P-1. At the physical layer, using synchronization signal blocks (SSB) transmitted as a burst in the downlink direction (gNB to UE), the example highlights both transmit/receive point (TRP) beam sweeping and UE beam sweeping to establish a beam pair link.
This example focuses on initial access procedures for idle users when a connection is established between the user equipment (UE) and access network node (gNB).
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