| Protocol | rrc | Network | 5g |
|---|---|---|---|
| Spec | 3GPP TS 38.331 | Spec Section | 6.2.2 |
| Direction | UE -> gNB | Message Type | Positioning Support |
| Full message name | 5G NR - UE Positioning Assistance Info |
|---|---|
| Protocol | RRC |
| Technology | 5G |
| Direction | UE -> gNB |
| Interface | Uu |
| Signaling bearer / channel | SRB1 / UL-DCCH |
| Typical trigger | Used when the UE provides positioning assistance information to support a location workflow. |
| Main purpose | Lets the UE send positioning-related assistance context that helps the network continue the positioning workflow. |
| Main specification | 3GPP TS 38.331, 6.2.2 |
| Release added | Release 16 |
| Procedures where used | UE Positioning Support, Location and Positioning Handling |
| Related timers | None highlighted |
UE Positioning Assistance Info is the UE-to-network NR RRC message used to provide UE-side positioning assistance information.
Lets the UE send positioning-related assistance context that helps the network continue the positioning workflow.
UE Positioning Assistance Info lets the UE send positioning-related assistance context to the network.
Call flow position: Sent when the UE provides positioning assistance context.
Typical state: UE is in connected mode during a positioning workflow.
Preconditions:
Next likely message: Further positioning handling at the network
Previous message(s): Location Measurement Indication
Next message(s): Positioning handling at the network
Security context: Sent as protected connected-mode signaling.
UEPositioningAssistanceInfo ::= SEQUENCE {
positioningAssistanceInfo OCTET STRING
}
Engineers mainly use the message to confirm that the UE supplied the expected positioning assistance context.
UL-DCCH-Message
message: uePositioningAssistanceInfo
positioningAssistanceInfo: present
| IE | Required | Description |
|---|---|---|
positioningAssistanceInfo | Yes | Carries the UE-side positioning assistance information. |
positioningAssistanceInfoCarries the UE-side positioning assistance information.
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: The UE may not have provided the expected assistance info.
What to inspect: Check this message and the surrounding location signaling.
Next step: Compare it with Location Measurement Indication and later network behavior.
It carries UE-provided positioning assistance information toward the network.
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.