RadioBearerConfig

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

RadioBearerConfig 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 v19.0.0 (2025-10)

Definition

The IE RadioBearerConfig is used to add, modify and release signalling, multicast MRBs and/or data radio bearers. Specifically, this IE carries the parameters for PDCP and, if applicable, SDAP entities for the radio bearers.

RadioBearerConfig ::=                   SEQUENCE {
    srb-ToAddModList                        SRB-ToAddModList                                        OPTIONAL,   -- Cond HO-Conn
    srb3-ToRelease                          ENUMERATED{true}                                        OPTIONAL,   -- Need N
    drb-ToAddModList                        DRB-ToAddModList                                        OPTIONAL,   -- Cond HO-toNR
    drb-ToReleaseList                       DRB-ToReleaseList                                       OPTIONAL,   -- Need N
    securityConfig                          SecurityConfig                                          OPTIONAL,   -- Need M
    ...,
    [[
        mrb-ToAddModList-r17                    MRB-ToAddModList-r17                                    OPTIONAL,   -- Need N
        mrb-ToReleaseList-r17                   MRB-ToReleaseList-r17                                   OPTIONAL,   -- Need N
        srb4-ToAddMod-r17                       SRB-ToAddMod                                            OPTIONAL,   -- Need N
        srb4-ToRelease-r17                      ENUMERATED{true}                                        OPTIONAL    -- Need N
    ]],
    [[
        srb5-ToAddMod-r18                       SRB-ToAddMod                                            OPTIONAL,   -- Need N
        srb5-ToRelease-r18                      ENUMERATED{true}                                        OPTIONAL    -- Need N
    ]],
    [[
        srb6-ToAddMod-r19                       SRB-ToAddMod                                            OPTIONAL,   -- Need N
        srb6-ToRelease-r19                      ENUMERATED{true}                                        OPTIONAL    -- Need N
    ]]
}

Fields (13)

Field	Description
srb-ToAddModList SRB-ToAddModList · OPTIONAL Cond HO-Conn
srb3-ToRelease ENUMERATED{true} · OPTIONAL Need N since v15.1.0	Release SRB3. SRB3 release can only be done over SRB1 and only at SCG release and reconfiguration with sync.
drb-ToAddModList DRB-ToAddModList · OPTIONAL Cond HO-toNR
drb-ToReleaseList DRB-ToReleaseList · OPTIONAL Need N
securityConfig SecurityConfig · OPTIONAL Need M	Indicates the security algorithm and key to use for the signalling and data radio bearers configured with the list in this IE RadioBearerConfig . When the field is not included after AS security has been activated, the UE shall continue to use the currently configured keyToUse and security algorithm for the radio bearers reconfigured with the lists in this IE RadioBearerConfig . The field is not included when configuring SRB1 before AS security is activated.
mrb-ToAddModList-r17 MRB-ToAddModList-r17 · OPTIONAL Need N since v17.0.0
mrb-ToReleaseList-r17 MRB-ToReleaseList-r17 · OPTIONAL Need N since v17.0.0
srb4-ToAddMod-r17 SRB-ToAddMod · OPTIONAL Need N since v17.1.0
srb4-ToRelease-r17 ENUMERATED{true} · OPTIONAL Need N since v17.0.0
srb5-ToAddMod-r18 SRB-ToAddMod · OPTIONAL Need N since v18.0.0
srb5-ToRelease-r18 ENUMERATED{true} · OPTIONAL Need N since v18.0.0
srb6-ToAddMod-r19 SRB-ToAddMod · OPTIONAL Need N since v19.0.0
srb6-ToRelease-r19 ENUMERATED{true} · OPTIONAL Need N since v19.0.0

RadioBearerConfig

Definition

Fields (13)

Used by (8)

Uses (7)

In the viewer