SRB-ToAddMod
SRB-ToAddMod is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.
Definition
SRB-ToAddMod ::= SEQUENCE {
srb-Identity SRB-Identity,
reestablishPDCP ENUMERATED{true} OPTIONAL, -- Need N
discardOnPDCP ENUMERATED{true} OPTIONAL, -- Need N
pdcp-Config PDCP-Config OPTIONAL, -- Cond PDCP
...,
[[
srb-Identity-v1700 SRB-Identity-v1700 OPTIONAL -- Need M
]],
[[
srb-Identity-v1800 SRB-Identity-v1800 OPTIONAL, -- Need M
n3c-BearerAssociated-r18 ENUMERATED{true} OPTIONAL -- Cond N3C MP
]],
[[
srb-Identity-v1900 SRB-Identity-v1900 OPTIONAL -- Need M
]]
}Fields (8)
| Field | Description |
|---|---|
| srb-Identity SRB-Identity | Value 1 is applicable for SRB1 only. Value 2 is applicable for SRB2 only. Value 3 is applicable for SRB3 only. Value 4 is applicable for SRB4 only. Value 5 is applicable for SRB5 only. Value 6 is applicable for SRB6 only. If srb-Identity-v1700, srb-Identity-v1800 or srb-Identity-v1900 is received for an SRB, the UE shall ignore srb-Identity (i.e. without suffix) for this SRB. |
| reestablishPDCP ENUMERATED{true} · OPTIONAL Need N | Indicates that PDCP should be re-established. Network sets this to true whenever the security key used for this radio bearer changes. Key change could for example be due to reconfiguration with sync, for SRB2 when resuming an RRC connection, or at the first reconfiguration after RRC connection reestablishment in NR. For SRB1, when resuming an RRC connection, or at the first reconfiguration after RRC connection reestablishment in NR, the network does not set this field to true . For LTE SRBs using NR PDCP, it could be for handover, RRC connection reestablishment or resume. Network doesn't include this field if any DAPS bearer is configured or if the RadioBearerConfig IE is part of an RRCReconfiguration message within the LTM-Config IE. For SRB3, network doesn't include this field if the RadioBearerConfig IE is part of an RRCReconfiguration message associated with subsequent CPAC within the ConditionalReconfiguration IE. |
| discardOnPDCP ENUMERATED{true} · OPTIONAL Need N since v15.1.0 | Indicates that PDCP should discard stored SDU and PDU according to TS 38.323 [5]. Network doesn't include this field if the RadioBearerConfig IE is part of an RRCReconfiguration message associated with subsequent CPAC within the ConditionalReconfiguration IE which is received within a MCG RRCReconfiguration message via SRB1. |
| pdcp-Config PDCP-Config · OPTIONAL Cond PDCP | |
| srb-Identity-v1700 SRB-Identity-v1700 · OPTIONAL Need M since v17.0.0 | Value 1 is applicable for SRB1 only. Value 2 is applicable for SRB2 only. Value 3 is applicable for SRB3 only. Value 4 is applicable for SRB4 only. Value 5 is applicable for SRB5 only. Value 6 is applicable for SRB6 only. If srb-Identity-v1700, srb-Identity-v1800 or srb-Identity-v1900 is received for an SRB, the UE shall ignore srb-Identity (i.e. without suffix) for this SRB. |
| srb-Identity-v1800 SRB-Identity-v1800 · OPTIONAL Need M since v18.0.0 | Value 1 is applicable for SRB1 only. Value 2 is applicable for SRB2 only. Value 3 is applicable for SRB3 only. Value 4 is applicable for SRB4 only. Value 5 is applicable for SRB5 only. Value 6 is applicable for SRB6 only. If srb-Identity-v1700, srb-Identity-v1800 or srb-Identity-v1900 is received for an SRB, the UE shall ignore srb-Identity (i.e. without suffix) for this SRB. |
| n3c-BearerAssociated-r18 ENUMERATED{true} · OPTIONAL Cond N3C since v18.1.0 | |
| srb-Identity-v1900 SRB-Identity-v1900 · OPTIONAL Need M since v19.0.0 | Value 1 is applicable for SRB1 only. Value 2 is applicable for SRB2 only. Value 3 is applicable for SRB3 only. Value 4 is applicable for SRB4 only. Value 5 is applicable for SRB5 only. Value 6 is applicable for SRB6 only. If srb-Identity-v1700, srb-Identity-v1800 or srb-Identity-v1900 is received for an SRB, the UE shall ignore srb-Identity (i.e. without suffix) for this SRB. |