Random Access resource selection for BFR. “rach-ConfigCommon” IE is used to provide RACH related information through SIB1. Number of available Contention based preambles UE to initiate RACH procedure, it needs to know the following:Ģ. ![]() RACH can be triggered by MAC/ RRC/ PDCCH Order. In further chapters we shall see in detail on the messages sent and received. Random Access resource selection for PDCCH-Order. Random Access Resource Selection for Reconfiguration with Sync.Ĥ. Random Access resource selection for SI request (On-Demand SI).ģ. ![]() Random Access resource selection for BFR.Ģ. But there are special scenarios like beam failure recovery and On Demand SI that needs to be looked into.ĭifferent scenarios for Random Access Resource selection:ġ. In this chapter we shall see where the UE can get the resources for PRACH transmission.īefore UE can send a PRACH, it needs to select an SSB then UE will selects an SSB with SS-RSRP above rsrp-ThresholdSSB for PRACH transmission.įor normal RACH procedure, UE will get the configuration from SIB1.
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