specviewer.org TS 38.331 ASN.1 index DownlinkConfigCommonSIB

DownlinkConfigCommonSIB

RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 6.3.2

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

First seen v15.3.0 (2018-09) · Last changed v19.1.0 (2026-01)

Definition

The IE DownlinkConfigCommonSIB provides common downlink parameters of a cell.

DownlinkConfigCommonSIB ::=     SEQUENCE {
    frequencyInfoDL                 FrequencyInfoDL-SIB,
    initialDownlinkBWP              BWP-DownlinkCommon,
    bcch-Config                     BCCH-Config,
    pcch-Config                     PCCH-Config,
    ...,
    [[
        pei-Config-r17                  PEI-Config-r17                         OPTIONAL,     -- Need R
        initialDownlinkBWP-RedCap-r17   BWP-DownlinkCommon                     OPTIONAL      -- Need R
    ]],
    [[
        frequencyInfoDL-v1800           FrequencyInfoDL-SIB-v1800              OPTIONAL      -- Need R
    ]],
    [[
        lowPowerConfig-r19              LowPowerConfig-r19                     OPTIONAL,     -- Need R
        pagingAdaptPEI-Config-r19       PEI-Config-r19                         OPTIONAL      -- Need R
    ]]
}

Candidate change requests of v19.1.0

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

Fields (9)

FieldDescription
frequencyInfoDL
FrequencyInfoDL-SIB
initialDownlinkBWP
BWP-DownlinkCommon
The initial downlink BWP configuration for a PCell. The network configures the locationAndBandwidth so that the initial downlink BWP contains the entire CORESET#0 of this serving cell in the frequency domain. The UE applies the locationAndBandwidth upon reception of this field (e.g. to determine the frequency position of signals described in relation to this locationAndBandwidth ) but it keeps CORESET#0 until after reception of RRCSetup / RRCResume/RRCReestablishment .
bcch-Config
BCCH-Config
The modification period related configuration.
pcch-Config
PCCH-Config
The paging related configuration.
pei-Config-r17
PEI-Config-r17 · OPTIONAL Need R
since v17.0.0
The PEI related configuration.
initialDownlinkBWP-RedCap-r17
BWP-DownlinkCommon · OPTIONAL Need R
since v17.0.0
If present, (e)RedCap UEs use this DL BWP instead of initialDownlinkBWP . If the locationAndBandwidth of this BWP contains the entire CORESET#0, the UE applies the locationAndBandwidth upon reception of this field (e.g. to determine the frequency position of signals described in relation to this locationAndBandwidth ) but it keeps CORESET#0 until after reception of RRCSetup / RRCResume/RRCReestablishment . Otherwise, i.e., if the locationAndBandwidth of this BWP does not contain the entire CORESET#0, the UE uses this BWP for receiving DL messages during initial access (Msg2, MsgB, Msg4) and after initial access. If absent, (e)RedCap UEs use initialDownlinkBWP provided that it does not exceed the (e)RedCap UE maximum bandwidth (see also clause 5.2.2.4.2).
frequencyInfoDL-v1800
FrequencyInfoDL-SIB-v1800 · OPTIONAL Need R
since v18.0.0
lowPowerConfig-r19
LowPowerConfig-r19 · OPTIONAL Need R
since v19.0.0
The LP-WUS and LP-SS related configuration.
pagingAdaptPEI-Config-r19
PEI-Config-r19 · OPTIONAL Need R
since v19.0.0
The PEI related configuration for paging adaptation. If the UE supports pagingAdaptationPEI-SupportBandList-r19 , it ignores po-NumPerPEI-r17 , payloadSizeDCI-2-7-r17 , and pei-FrameOffset-r17 , if configured.

Used by (1)

Uses (8)

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