CFRA-SSB-Resource

RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 6.3.2, in the RACH-ConfigDedicated clause

CFRA-SSB-Resource is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v15.0.0 (2018-01) · Last changed v16.3.0 (2021-01)

Definition

CFRA-SSB-Resource ::=           SEQUENCE {
    ssb                             SSB-Index,
    ra-PreambleIndex                INTEGER (0..63),
    ...,
    [[
        msgA-PUSCH-Resource-Index-r16   INTEGER (0..3071)     OPTIONAL  -- Cond 2StepCFRA
    ]]
}

Candidate change requests of v16.3.0

The CRs whose title or cover names this change, strong and likely matches only.

CR 2149 r1 (strong): Corrections to 2-Step RA

Fields (3)

Field	Description
ssb SSB-Index	The ID of an SSB transmitted by this serving cell.
ra-PreambleIndex INTEGER (0..63)	The preamble index that the UE shall use when performing CF-RA upon selecting the candidate beams identified by this SSB.
msgA-PUSCH-Resource-Index-r16 INTEGER (0..3071) · OPTIONAL Cond 2StepCFRA since v16.3.0	Identifies the index of the PUSCH resource used for MSGA CFRA. The PUSCH resource index indicates a valid PUSCH occasion (as specified in TS 38.213 [13], clause 8.1A) and the associated DMRS resources corresponding to a PRACH slot. The PUSCH resource indexes are sequentially numbered and are mapped to valid PUSCH occasions corresponding to a PRACH slot which are ordered, first, in increasing order of frequency resource indexes for frequency multiplexed PUSCH occasions; second, in increasing order of DMRS resource indexes within a PUSCH occasion, where a DMR $S_{id}$ resource index is determined first in an ascending order of a DMRS port index and then in an ascending order of a DMRS sequence index, third in increasing order of time resource indexes for time multiplexed PUSCH occasions within a PUSCH slot and fourth, in increasing order of indexes for PUSCH slots. For the case of contention free 2-step random access type, if this field is absent, the UE shall use the value 0.

Used by (2)

Uses (1)

SSB-Index