| Protocol | rrc | Network | 5g |
|---|---|---|---|
| Spec | 3GPP TS 38.331 | Spec Section | 5.5, 6.2.2 |
| Direction | gNB -> UE | Message Type | Measurement Configuration |
| Full message name | 5G NR - Logged Measurement Configuration |
|---|---|
| Protocol | RRC |
| Technology | 5G |
| Direction | gNB -> UE |
| Interface | Uu |
| Signaling bearer / channel | SRB1 / DL-DCCH |
| Typical trigger | Used when the network wants the UE to log measurements for later retrieval. |
| Main purpose | Lets the network configure how the UE stores measurements for later upload or analysis. |
| Main specification | 3GPP TS 38.331, 5.5, 6.2.2 |
| Release added | Release 16 |
| Procedures where used | Logged Measurement / MDT Configuration, Deferred Measurement Collection |
| Related timers | None highlighted |
Logged Measurement Configuration is the NR RRC message used to configure measurement logging behavior for MDT and later reporting workflows.
Lets the network configure how the UE stores measurements for later upload or analysis.
Logged Measurement Configuration tells the UE what measurements to store for later reporting.
Call flow position: Sent when the network configures logging behavior in the UE.
Typical state: UE is in connected mode while logging is configured.
Preconditions:
Next likely message: Measurement logging at the UE and later upload
Previous message(s): RRC Reconfiguration
Next message(s): Logged measurement collection, UE Information Response
Security context: Sent as protected connected-mode signaling.
LoggedMeasurementConfiguration ::= SEQUENCE {
loggedMeasurementConfig OCTET STRING
}
Engineers inspect this message together with later logged-measurement upload or UE information reporting.
DL-DCCH-Message
message: loggedMeasurementConfiguration
loggedMeasurementConfig: present
| IE | Required | Description |
|---|---|---|
loggedMeasurementConfig | Yes | Carries the parameters that tell the UE what to log and under which conditions. |
loggedMeasurementConfigCarries the parameters that tell the UE what to log and under which conditions.
Presence: Required
In practice: In practice, compare this field with the original request and with any later release-dependent optional fields so you can see whether the network accepted the same service model the UE asked for.
Likely cause: Logging may never have been configured correctly.
What to inspect: Check the logged measurement configuration and later upload path.
Next step: Correlate this message with UE Information Request / Response and MDT workflows.
It configures the UE to store measurements for later upload or analysis.
Decode this message with the 3GPP Decoder, inspect the related message database, or open the matching call flow to see where this signaling step fits in the full procedure.