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Author: Admin | 2025-04-28
(re-)transmission(s), the UE goes back to MsgA transmission i.e., switches back to 2-step RA type.- If the RA procedure with 2-step RA type is not completed after a number of MsgA transmissions, the UE can be configured to switch to CBRA with 4-step RA type. This is explained in later sections.3.2 CFRA in 2-step RA Type:- In both CBRA and CFRA procedures, MsgA includes a preamble transmission on PRACH and a payload transmission on PUSCH. In 4-step RA type, the UE never transmits a PUSCH before receiving Msg2 (RAR).- Note ‘MsgA’ is used here instead of ‘Msg1’.- After MsgA transmission, the UE monitors for a response from the network within a configured window (msgB-ResponseWindow-r16).- For CFRA, upon receiving the network response, the UE ends the RA procedure as shown in Fig D above. In this case, the response to MsgA is known as MsgB unlike Msg2 in the case of 4-step RA type.- If the RA procedure with 2-step RA type is not completed after a number of MsgA transmissions, the UE can be configured to switch to CBRA with 4-step RA type. This is explained in later sections.4 Selection between 2-step and 4-step RA TypesThe UE selects 2-step or 4-step RA type at the initiation of the RA procedure based on network configuration:CBRA case:- When both 4-step and 2-step RA types are configured by the network, an RSRP threshold is used by the UE to select between 2-step RA type and 4-step RA type. The RSRP threshold is configured
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